Log boiler 20 - 60 kW Operation 2… · 2019-09-12 EN 0000000300 V.007 3.47.0 110, 218, 121P, 219P...

2019-09-12EN0000000300V.0073.47.0110, 218, 121P, 219P93315-002

Log boiler20 - 60 kW

Operation

ETA Heiztechnik

Gewerbepark 1

A-4716 Hofkirchen an der Trattnach

Tel: +43 (0) 7734 / 22 88 -0

Fax: +43 (0) 7734 / 22 88 -22

[email protected]

www.eta.co.at

Contents

1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Warranty, guarantee and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2 Safety devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Suitable fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5 Correct quantity of wood. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7 ETAtouch controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.1 Getting to know the control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.1.1 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.1.2 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.1.3 Integrated help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.1.4 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.1.5 Inputs and outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.1.6 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7.1.7 meinETA remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7.1.8 Favourites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7.1.9 USB camera . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

7.2 [Boiler] function block – log boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

7.2.1 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

7.3 [BufferFlex] function block - log boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.3.1 Setting warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.3.2 Buffer with solar heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.3.3 Buffer as a combination tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.3.4 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

7.4 [Hot water tank] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.4.1 Setting the hot water charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45


7.5 [Fresh water module] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

7.5.1 Setting the hot water charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49


7.6 [Heating circuit] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

7.6.1 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.6.2 Setting the heating time slots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

7.6.3 The heating curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55


7.7 [Solar] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

7.7.1 Solar heating system with one tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

7.7.2 Solar heating system with 2 tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

3

7.7.3 Solar heating system for buffer with 2 internal coils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

7.7.4 Solar heating system with external heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

7.7.5 Solar heating system with external heat exchanger and stratified charging valve. . . . . . . . . 64


7.8 [Aux.boiler] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

7.8.1 Setting the charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67


8 Regular cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

9 Emission measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

9.1 Information about measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

9.1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

9.1.2 Flue pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

9.1.3 Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

9.2 Perform emissions measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

10 Heating value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

11 Heating water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

11.1 Water hardness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

11.2 Refilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

4 www.eta.co.at

General Preface

1 General

1.1 Preface

Dear customer,

This user manual provides important information andinstructions, to ensure safe and satisfactory operationof your product. Please take the time to look through it.

Warranty and guarantee

You should also read the "Conditions for warranty,guarantee, liability" (see chapter 1.3 "Warranty,guarantee and liability") carefully. As a rule, a profes-sional heating technician shall satisfy these conditions.Nevertheless, inform the technician of our warrantyconditions. All of the requirements we impose areintended to prevent damage that neither you nor wewish to occur.

Read the user manual

Please read the user manual carefully before startingup the system. This is the only way to ensure that youcan operate your new boiler efficiently and withminimum environmental impact.

Take advantage of the knowledge and skills of anexpert

Only allow an expert to assemble, install andcommission the equipment and carry out the basicboiler settings. Insist on receiving an explanation andtraining on how your new boiler functions and how tooperate and maintain it.

Extended warranty

We grant an extended warranty if the product is com-missioned by an authorised partner company or by ourown customer service. In this regard, please note thewarranty conditions applicable at the time of purchase.

Service agreement

You can ensure the best care for your heating systemby taking out a service agreement with one of ourcertified contractors or our own customer service.

Remote control of the boiler via the internet

The remote control enables you to operate your ETAboiler remotely via your own network (VNC Viewer) orthe internet <www.meinETA.at> using a PC,smartphone or tablet, as though you were standingright in front of the ETAtouch control system of your

ETA boiler. A LAN cable is required for the connectionfrom the ETAtouch control system to the internetmodem.

Details for the remote control can be found in themanual "Communication platform meinETA".

Details for the connection of the LAN cable can befound in the boilers installation manual.

1.2 General information

Copyright

All contents of this document are property of ETAHeiztechnik GmbH and are protected by copyright.Any reproduction, transfer to third parties or use forother purposes is prohibited without written permissionfrom the owner.

Subject to technical changes

We reserve the right to make technical modificationswithout notice. Printing and typesetting errors orchanges of any kind made in the interim are not causefor claims. Individual configurations depicted ordescribed here are only available optionally. In theevent of contradictions between individual documentsregarding delivery scope, the information in our currentprice list applies.

Software Description

The software version described in this documentationcorresponds to the version valid at the time of publica-tion. The software version installed on your productmay differ from that described in this documentation.

A software update to a more recent version canalways be performed. With the appropriate au-

thorisation, the required files can be found at"www.eta.co.at".

Explanation of symbols

Instructions and information

Layout of safety instructions

SIGNAL WORD!

Type and source of danger

Possible effects

• Measures for avoiding the danger

Types of safety instruction

5

Warranty, guarantee and liability General

CAUTION!

On non-compliance with this safety instruction, there isa risk of material damage.

WARNING!

On non-compliance with this safety instruction, there isa risk of physical injury.

DANGER!

On non-compliance with this safety instruction, there isa risk of major physical injury.

1.3 Warranty, guarantee and liability

Requirements

We can only accept liability for the function of ourproducts if they are correctly installed and operated.This is only possible if the conditions below arecomplied with.

Maximum of 2,000 hours at full load per year

The boiler described in this user manual may only beused for heating and producing hot water, with no morethan 2,000 full-load hours annually.

Installation in a dry room

For set-up, a dry room is required. In particular, onlycondensation dryers may be used as clothes dryers inthe same room.

Observe local building and fire safety regulations

Local building and fire safety regulations must beobserved.

Suitable fuel – logs

The log boiler is suitable for use with wood briquettesand air-dried split logs with no more than 20% watercontent. Use with unsuitable fuels, especially refuse,coal and coke, and also wet wood, is not permitted.

Ensure supply air is free from aggressivesubstances

The air supplied to the boiler must be free fromaggressive substances such as chlorine and fluorinefrom solvents, cleaning agents, adhesives and propel-lants, or ammonia from cleaning agents, to preventcorrosion of the boiler and chimney.

Permissible water hardness

Water is the intended heat-transfer medium. Forspecial anti-frost requirements, up to 30% glycol maybe added. Softened water is required for the initial fill-up of the heating system and for refilling after repairs.Addition of hard water should be minimised to limitlimescale build-up in the boiler.

In order to protect the boiler from calcification, thewater hardness of the heating water must be

taken into account. Observe the indications outlined inÖNORM H 5195-1. Details can be found in chapter 11"Heating water".

pH value between 8 and 9

The pH value of water used to fill the heating systemmust be between 8 and 9.

Use a sufficient number of shut-off valves

Set enough shut-off valves to avoid bleeding largeamounts of water during repairs. Any leaks in thesystem must be repaired at once.

Minimum return temperature 60°C

Ensure a minimum return temperature of 60°C to theboiler.

Install safety valve and thermal relief valve

A safety valve (triggered at 3 bar) as protection againstexcess pressure and a thermal relief valve (triggeredat 97 °C) to protect against overheating must beinstalled by the contractor.

Provide a sufficiently large expansion tank or apressure maintaining device

To prevent air from being drawn in while the system iscooling, the heating system professional must providea sufficiently large expansion tank or a pressuremaintaining device.

Open expansion tanks must not be used.

Sufficient power

Operation at lower power than the lowest powerspecified on the type plate is not permitted.

Expanding the control system

Only components provided by us may be used forexpanding the control system, unless these aregenerally available standard devices, such as thermo-stats.

6 www.eta.co.at

General Warranty, guarantee and liability

Regularly perform cleaning and maintenance

Cleaning and maintaining the product is essential. Therequired steps and intervals are either contained in thisdocumentation or included as a separate document.

Repairs

Repairs are only permitted using spare parts providedby us. The only exceptions are common standardisedparts such as electrical fuses or fastening materials, aslong as they possess the required features and do notrestrict the functionality of the system.

Proper installation

The installing contractor is liable for proper installationaccording to the corresponding installation instructionsand the relevant rules and safety regulations. If you ascustomer have installed the heating system partly orentirely without relevant training and in particularwithout up-to-date practical experience, without havingthe installation checked by a trained and responsibleexpert, we exclude defects in our delivery and conse-quential damages resulting from this cause from ourwarranty, guarantee and liability.

Repair of defects

For repairs of defects carried out by the customer or bya third party, ETA shall only bear the costs or remainobligated by warranty if this work was approved inwriting in advance by the customer service of ETAHeiztechnik GmbH.

No tampering with boiler safety devices

Boiler safety devices such as those mentioned belowmust not be tampered with: Temperature monitoringand control devices, safety temperature limiters, safetyvalves and thermal discharge valves.

7

Description

2 Description

Operating elements of the boiler

The illustrations show a wood chip boiler with theactuators for the air valves on the left side. The il-

lustrations are also equally representative of a boilerwith the actuators on the right side.

1 Release button for safety temperature limiter(STB)

2 Mains switch (symbol )

3 Maintenance switch (symbol )

4 Cleaning lever for the heat exchanger tubes

5 Screen for the ETAtouch control system

6 Door contact switch

7 Insulation door

8 Fuel chamber door

9 Ignition door

10 Combustion chamber door

11 Actuator for secondary air

12 Actuator for primary air

8 www.eta.co.at

Description

Explanation of the maintenance switch

The maintenance switch on the boiler is needed forperforming maintenance with the aid of the [Main-tenance] function in the ETAtouch control system. Thisdisplays the individual maintenance steps on the boilerscreen.

With this variant the heating mode is stopped, butthe boiler remains on at the mains switch. So that

all drives are disconnected, the safety chain of theboiler is disrupted with the maintenance switch. Thescreen will display a message when it is time to actuatethe maintenance switch.

Fig. 2-1: Maintenance switch

The maintenance switch is marked with the symbol and has two settings.

• "1" = regular operationThis is the standard position of the maintenanceswitch. The boiler can execute heating mode in thisposition.

• "0" = maintenance modeIn this position, all drives are disconnected toperform maintenance. The circuit boards,however, are still live.

Display maintenance steps on the screen

With this boiler, the maintenance steps can also bedisplayed on the ETAtouch control system screen. Therequired activities will be explained to you step-by-stepand supplemented with detailed graphics. Eachmaintenance is saved and the details can be viewed atany time. So you can maintain a long-term overview ofthe maintenance carried out. Of course, themaintenance can also be carried out using the serviceguide, without the support of the ETAtouch controlsystem.

To access maintenance, switch to settings in the boilerfunction block ( [Settings] button) and then selectthe function [Maintenance].

Fig. 2-2: Overview (example)

You can also access this overview by pressingthe maintenance switch. Also when the message

appears that maintenance of the boiler is required.

In the overview the different maintenance intervals arelisted in the upper area. This includes the maintenancealready carried out. With the button, informationabout the selected maintenance is displayed.Maintenance that you can carry out as an endcustomer is labelled with the symbol. All others arereserved for specialists and require authorisation.

Press the button to start the maintenance. Theindividual steps are displayed on the screen. You canswitch to the next or the previous screen respectivelywith the arrow keys on the left and right side of thescreen.

Fig. 2-3: Maintenance step (example)

9

Description

Follow the on-screen instructions and carry out allsteps carefully. Enter your name at the end ofmaintenance ( button) and save the maintenancewith the button.

Fig. 2-4: End of maintenance

To end maintenance prematurely, press the rightarrow key several times until you get to the end.

There you can end the maintenance with the button. Cancellation during a maintenance step is notpossible.

Adjust the hinges for the screen

The ease of movement of the hinges to swivel thescreen can be adjusted with the Allen key supplied. Ifthe screen does not remain in its desired position,tighten the screws on the hinges a little.

Fig. 2-5: Hinges

Clean panels

If necessary, clean the panels of the boiler and theETAtouch screen with a moist cloth.

Under no circumstances use aggressivesolvents, chemicals or scouring agents. They can

lead to stress cracks and damage.

Protection function for drives and pumps

Lets you switch on the boiler in summer, oroutside the heating period on the main switch. As

the ETAtouch control system starts some drives andpumps for a short time at regular intervals so that theydo not seize in the event of a longer standstill. If the boiler is switched off for a longer time on themains switch, then this protection function is missing.Drives or pumps could then seize and cause faultswhen being switched back on.

10 www.eta.co.at

Safety General information

3 Safety

3.1 General information

Operation only by trained personnel

The product may be operated by trained adults only.Training may be provided by the heating technician orour customer service. Please read the associated doc-umentation carefully in order to avoid errors duringoperation and maintenance.

Persons who lack experience and knowledge as wellas children may not operate, clean, or maintain theproduct.

Keep fire extinguishers in a clearly visible location

In Austria, the minimum requirement is anABC powder extinguisher with 6 kg. An AB foam extin-guisher with 9 litres, which produces less damagewhen used, is preferable. The fire extinguisher shouldbe kept outside the boiler room, visible and easilyaccessible. Even if country-specific regulations do notprescribe a fire extinguisher, we still recommend thatyou keep one in-house.

Fig. 3-1: Fire extinguisher

Storage of ash

The ash must be kept in non-flammable containerswith covers for cooling. Never put hot ash into thewaste bin!

3.2 Safety devices

Pump safety run, automatic heat dissipation atovertemperature

If the boiler temperature exceeds 87 °C (factorysetting) for any reason, the pump safety run will start.All heating pumps and boiler pumps that areconnected to the boiler control system are switched onto dissipate heat from the boiler.

This action prevents the boiler temperature from risingfurther and triggering further safety devices such asthe safety temperature limiter and the thermal reliefvalve.

Heat dissipation is limited by the selectedmaximum flow temperature in the heating circuits

and the target hot water temperature.

Boiler overheating

If a boiler temperature of 90°C is reached, the controlsystem switches the draught fan off and a warningmessage appears on the display.

Reasons for a boiler temperature increase include:

• too much wood in the fuel chamber

• heating circuits unexpectedly switched off

• heating pump failed

• heating line inadvertently shut off

Once the boiler temperature has fallen below86°C, heating resumes automatically.

During such emergency shutdowns the woodcontinues to emit gas and the unburned wood

gas causes tar deposits in the boiler and chimney.

Install thermal emergency cooling valve againstoverheating

The safety heat exchanger built into the boiler must beconnected by the heating technician to the house'scold water supply via a thermal relief valve to protect

11

Safety devices Safety

the boiler against overheating if the pump fails. Theminimum pressure in the cold water pipe must be 2 barand the temperature must not exceed 15 °C.

Fig. 3-2: Thermal emergency cooling valve

Only thermal emergency cooling valves thatcorrespond to the standard DIN EN 14597 (orcomparable standards) may be installed. They mustactivate at 100 °C and have a flow rate of at least2.0 m³/h. The clear width of the cold water supply andoutlet may not fall below the nominal diameter of thesafety heat exchanger.

The cold water supply must be connected to the upperconnector of the safety heat exchanger; the lowerconnector serves as an outlet to the sewer. To preventthe supply line from being shut off accidentally, removethe levers from ball valves or the hand wheels fromvalves and hang them there with a piece of wire.

Fig. 3-3: Installation on the boiler

1 Cold water connection

2 Isolating valve; remove hand wheel

3 Strainer

4 Thermal emergency cooling valve

5 Visible outlet to sewer

The outlet must have an easily visible flow path so mal-functions can be recognised. Direct the dischargedwater to the sewer via a siphon funnel or at least witha pipe into the ground so that nobody can be scaldedif the valve is activated.

Even for cold water coming from a domestic well withits own pump, a thermal emergency cooling valve mustbe installed on the boiler. With a generouslydimensioned air vessel, enough water for cooling willcome even if there is a power failure. If the powersupply is very uncertain, a dedicated air vessel for thethermal emergency cooling valve is required.

Safety shutdown by safety temperature limiter

For additional safety against boiler overheating, asafety temperature limiter is built into the boiler. Whena boiler temperature of 105°C (tolerance 100 to 106°C)is reached, it blocks the draught fan so that it can nolonger be switched on. When the boiler temperaturedecreases below 70°C again, the safety temperaturelimiter can be manually released for a restart of theboiler.

Installing a safety valve against overpressure

A safety valve with 3 bar opening pressure must beinstalled on the boiler. Every heat producer in a heatingsystem must be protected by at least one safety valveagainst pressure exceeding the maximum permissibleoperating pressure (see EN 12828). These valvesmust be designed such as to ensure the maximumpermissible operating pressure that can arise in theheating system or parts thereof. The safety valve mustbe situated in the boiler room and be easily accessible.

Fig. 3-4: Safety valve

DANGER!

Do not install any shut-off valves, strainers or such likebetween the boiler and the safety valve.

The connection size of the safety valve is determinedon the basis of the heating system's maximum heatingcapacity, as shown in the table.

Valve sizea

Nominal diameter (DN)

Maximum heating capacity (kW)

15 (G ½) 50

12 www.eta.co.at

Safety Safety devices

Install the safety valve at the highest point of the heatproducer or in the flow pipe close to the heat producer.Only in this way can it discharge heat by blowing outhot water and steam.

The safety valve may be installed in any position, butthe upper part of the valve must not face downward.The flow pipe may be 1 m long maximum and must berouted in a straight line in the nominal diameter of thevalve inlet.

DANGER!

Safety valve outlet

The safety valve outlet must be directed to the groundin a pipe so nobody is endangered by hot water orsteam.

The safety valve outlet (vent pipe) must have atleast the same nominal diameter as the valveoutlet, be installed with a consistent gradient andbe routed to a sewage system (e.g. duct). The ventpipe may contain a maximum of 2 bends and be2 m long. If a length of more than 2 m is required,the next size of pipe must be selected. More than3 bends and 4 m of length are not permitted. Themouth of the vent pipe must allow easy inspectionand be routed such as to exclude any danger topersons. If the vent pipe ends above a funnel, itsdischarge pipe must have a cross section at leastdouble that of the valve inlet.

20 (G ¾) 100

25 (G 1) 200

32 (G 1 ¼) 300

40 (G 1 ½) 600

50 (G 2) 900

a. The valve size is determined by the size of the inlet connection.

Valve sizea

Nominal diameter (DN)

Maximum heating capacity (kW)

13

Suitable fuels

4 Suitable fuels

Suitable fuel

The firewood must be air-dry, i.e. it must have dried forat least one year and have a water content under 20%.We recommend using half-metre split logs with anaverage diameter of 10 cm.

Do not split round logs with a diameter under 8 cm;instead place them between the split logs in themiddle.

Boards may only be added between the logs and in nocase should they be included in the first layer as theywould block the burn-through opening in the grate.

Small pieces of fuel may only be burned as a minoraddition placed among the split logs, but never in thebottom layer. The smaller the pieces, the less of themmay be added.

Wood briquettes measuring 6 cm to 10 cm in diameterin compliance with ISO 17225-3:2014.

Only 1 oversized split log or 1 stump piece can beplaced in the top layer, but no more. Complete

burning may require 2 combustion phases.

Unsuitable fuel

Wet fuel with a moisture content in excess of 20% maynot be burned as it results in condensation which canlead to corrosion of the boiler's fuel chamber walls.

The following also may not be burned: rubbish, paperand cardboard (only for start-up), wood dust fromsanding, sawdust, pieces of wood smaller than thumb-sized, coal and coke, and fuels generally prohibited bylocal air quality regulations, such as old railwaysleepers, plastic-coated plywood, impregnated wood,etc.

The Clean Air Act 1993 and Smoke Control Areas

Under the Clean Air Act local authorities may declarethe whole or part of the district of the authority to be asmoke control area. It is an offence to emit smoke from

a chimney of a building, from a furnace or from anyfixed boiler if located in a designated smoke controlarea. It is also an offence to acquire an "unauthorisedfuel" for use within a smoke control area unless it isused in an "exempt" appliance ("exempted" from thecontrols which generally apply in the smoke controlarea).

In England appliances are exempted by publication ona list by the Secretary of State in accordance withchanges made to sections 20 and 21 of the Clean AirAct 1993 by section 15 of the Deregulation Act 2015.Similarly in Scotland appliances are exempted bypublication on a list by Scottish Ministers under section50 of the Regulatory Reform (Scotland) Act 2014.

In Wales and Northern Ireland these are authorised byregulations made by Welsh Ministers and by theDepartment of the Environment respectively.

The ETA SH 20, 30, 40, 50 and 60 kW boiler has beenrecommended as suitable for use in smoke controlareas when burning air-dried billet wood (max. 20%water content).

Further information on the requirements of the CleanAir Act can be found here: https://www.gov.uk/smoke-control-area-rules

Your local authority is responsible for implementing theClean Air Act 1993 including designation andsupervision of smoke control areas and you cancontact them for details of Clean Air Act requirements.

14 www.eta.co.at

Correct quantity of wood

5 Correct quantity of wood

When not much heating is needed, only place a small amount of wood in the boiler

Absorbing all the heat from a boiler fully loaded with wood would require buffer storage tanks larger than needed forwinter operation and also larger than those normally installed. When less heat is required, i.e. for hot water in thesummer, or during the evening shortly before the night set-back, only load the boiler with the amount of wood actuallyneeded. The table below displays the amount of wood needed for summer operation for different boiler sizes (= fuelchamber capacity), wood type, buffer volume and buffer charging status. Bear in mind that a "buffer top" temperaturesensor that is installed too low reduces the usable volume.

If the living space already needs some heating, start with the amount of wood indicated in the table below. Toestablish the correct amount, approach the fully charged buffer state slowly, adding one or two more logs everyheating cycle. If too much wood is loaded, an emergency shutdown of the boiler will occur. If the boiler overheats,the flow of air is stopped. The fire will go out, but the hot wood will continue to smoulder for a while. and the unburnedwood gas resulting from the lack of air can create tar deposits in the boiler and flue. If this occurs often, the boiler'sheat exchanger will become clogged with tar.

Observe the energy density of the fuel. The energy content of 50 litres of wood briquettes corresponds to100 litres of beech wood or 150 litres of spruce.

The current buffer charging status is displayed in the control system in the boiler overview and on the buffer. Itis shown in percent and is the average of the three buffer temperatures (top, middle, bottom) between 30 °C

(=0%) and 80 °C (=100%).

Tab. 5-1: Correct quantity of wood

SH20 / SH30 Buffer charging status SH40 / SH50 / SH60

Maximum fuel load Size of buffer storage tank (litres) Maximum fuel load

Briquettes

Beech Spruce 3300 2200 1650 1100Briquette

sBeech Spruce

90% 85% 80% 70%

85% 78% 70% 55%

1/4 80% 70% 60% 40%

1/4 75% 63% 50% 25% 1/4

70% 55% 40% 10%

1/2 65% 48% 30% 0%

60% 40% 20% 1/8 1/4

55% 33% 10%

1/4 1/2 3/4 50% 25% 0% 1/2

45% 18%

40% 10%

4/4 35% 0%

30%

3/4 25% 1/4 1/2 3/4

20%

15%

10%

5%

1/2 4/4 0% 4/4

15

Start-up

6 Start-up

Checking the heating system's water pressure

In buildings with up to three storeys, the optimumwater pressure in a cold heating system is between 1and 2 bar. For a warm heating system, the optimumwater pressure is between 1.5 and 2.5 bar.

Fig. 6-1: Pressure gauge

If the water pressure is too low, fill the coldheating system to approx. 2 bar. Do not fill to a

higher pressure, because water expands as thetemperature rises and the water pressure also rises inheating mode. The safety valve triggers at approx. 2.8bar.

If the water pressure drops several times a year,contact a heating professional. When refilling

water in the heating system, the same water as usedduring initial filling should be used whenever possible(e.g. treated water).

Opening the heating lines

If the system is new or has been out of operation forsome time, verify whether the return riser mixing valveis in the "AUTO" position and all shut-off valves in theheating lines are open. Always keep ball valves completely open to avoidruining the seal. Open the valves by turning anti-clockwise, and then turn back 1/4 turn from the fullyopen position to relieve pressure on the valve stem.

Checking the buffer charging status

Before starting the boiler, check the current buffercharging status to avoid adding too much wood. TableTab. 5-1: "Correct quantity of wood" shows how muchwood should be added. The buffer charging status isshown in the boiler overview.

Pay particular attention to the different energydensities of the fuels and the lower heat

consumption in summer.

Actuate cleaning lever

Close the insulation door and clean the heatexchanger by repeated movement (10 x) of thecleaning lever on the side.

Fig. 6-2: Cleaning lever

This step is omitted if the optional automatic heatexchanger cleaner is mounted on the boiler.

Open insulation door, draught fan starts automati-cally

When the insulating door is opened, the draught fanstarts automatically and the switch changes to the

setting. The operating condition changesfrom [Ready] to [Insulation door open].

Fig. 6-3: Insulation door, draught fan

If the draught fan does not start, either a fault oran alarm is present. Check the messages on the

screen.

16 www.eta.co.at

Start-up

Open fuel chamber door

The draught fan must be running before the fuelchamber door is opened so that any combustion gascan be extracted from the fuel chamber.

Fig. 6-4: Fuel chamber door

If the boiler has not safely cooled down, no boilerdoors may be opened without a draught fan

running. A sudden inflow of air in the presence ofsmouldering wood may result in a deflagration.

The fuel chamber door is always closed duringboth start-up and heating operation. It is opened

only when ash is removed from the boiler.

Checking the fuel chamber

Use the poker to distribute ashes and charcoal evenlythroughout the fuel chamber. The ash serves asinsulation and protects the grate and bottom of thecombustion chamber from too rapid wear. Therefore,leave a layer of ash approximately 3 cm thick in thefuel chamber.

Fig. 6-5: Distributing ash and coal evenly

Check the openings for the primary air in thesuspension plates and also the burn-through openingsin the grate. These openings must be free so that thefire enters the combustion chamber when it is lit. If not,use the poker to free them.

Fig. 6-6: Openings for primary air and burn-through openings

Placing logs close together in the fuel chamber

The boiler is optimized for 50 cm logs, which should beused because this makes the best use of the fillingspace. Add the required amount of closely spaced logs to thefuel chamber. Stack the logs instead of throwing themin at random. Always place the first layer of logslengthwise, so that it ignites quickly. See the followinggraphic.

Fig. 6-7: 50 cm log

17

Start-up

Fig. 6-8: Adding wood (50 cm log)

For 33 cm logs, always place the first layer infront of the ignition door lengthwise in the boiler,

so that it ignites quickly. Only place the 33 cm logscrossways at the end of the fuel chamber. Insert allother layers like the first layer.

Fig. 6-9: 33 cm log

Adjusting a log over burn-through opening

Lift the bottom log above the burn-through opening inthe grate with the poker and place small pieces of coal(from the fuel chamber) or small pieces of woodunderneath so that the burn-through openings in the

grate remain free. To make ignition easier, next to thelog on the left and right there should be a small gapseparating it from the neighbouring logs.

Fig. 6-10: Keeping the burn-through opening free

Place only one oversized log on top

Only one oversized split log or one stump piece can beplaced in the top layers, but no more. Two combustionphases may be needed for complete combustion.

Fig. 6-11: oversized log

Brushwood, coarse wood chips, unsplit logs anduntreated wood waste should be added only as asecondary fuel among the split logs.

First, place half of the required amount of logs in thefuel chamber (at least 3 layers). Then alternately addthe secondary fuel (brushwood, coarse wood chips,

18 www.eta.co.at

Start-up

round logs, wood waste) between the layers withadditional logs. The smaller the pieces of additionalfuel are, the more logs must be added between them.

Fig. 6-12: Additions

Under no circumstances should secondary fuel(brushwood, coarse wood chips, round logs,

wood waste) be used for the bottom layer. Such finematerial burns too quickly, resulting in incompletecombustion in the combustion chamber, which is stillcold during start-up. As a result, the heat exchangermay become soiled with tar deposits.

Closing the fuel chamber door, opening theignition door

Close the fuel chamber door and then open the ignitiondoor.

Fig. 6-13: Ignition door open

If the boiler is not to be started up yet, close bothdoors and, in the boiler overview, switch off the

boiler using the switch.

WARNING!

Ignition of the wood by embers

If the wood that has been added has already ignited,for example from embers in the fuel chamber, theboiler may not be switched off. A sudden inflow of airin the presence of smouldering wood may result in anexplosion.

Do not turn off the boiler and continue heating.Leave the ignition door slightly open until theexhaust temperature reaches above 100 °C. Onlythen should you close the ignition door and theinsulating door.

Igniting fire with cardboard and newspaper

Place crumpled paper or a few pieces of cardboard infront of the first layer of wood and ignite it. The draughtfan sucks the flame over the tightly stacked logs,causing them to ignite more quickly. For heavy, smoothhardwood, larger pieces of wood may be needed forstart-up.

Fig. 6-14: Ignition

DANGER!

No ignition aids such as petrol

Never use petrol, turpentine or similar materials as an"ignition aid". Risk of explosion!

The ignition door should be kept open afterignition in order to monitor the progress of the fire.

Do not close the ignition door until the boiler hasreached an exhaust temperature of 100 °C.

19

Start-up

How long it takes the fire to start depends on the typeof wood used; rough spruce may need only 2 minutes,smooth beech may require 5 minutes until the requiredexhaust temperature of 100 °C is reached.

Fig. 6-15: Wood ignites

Closing the ignition door and insulation door at100 °C exhaust temperature

Once a few logs are burning well and the exhausttemperature is over 100 °C, close the ignition door andthe insulation door.

Fig. 6-16: Closing the doors

The exhaust temperature is displayed in the boileroverview. At over 100°C, an arrow appears to indicatethat the ignition door should be closed.

When the insulating door is closed, the boiler automat-ically switches to [Ignition] mode and, once theresidual oxygen content is below 15%, to [Heating]mode. The boiler is now in heating mode and regulatesthe combustion of the wood independently.

Avoiding opening boiler doors unnecessarily

Avoid opening the insulating door and the fuelchamber door unnecessarily in [Heating] mode. Thatdisrupts the boiler control and increases fuel consump-tion. Also keep the ignition door and the combustionchamber door closed.

CAUTION!

Leaving the doors closed in heating mode

Never open the insulating door and the fuelchamber door when the boiler is in [Calibratinglambda probe] or [Overtemperature] mode.

Completion of heating mode with ember burnout

Once the wood in the boiler has been burned (residualoxygen content above 15% for more than 5 minutes) orthe exhaust temperature falls below 80 °C, the boilerautomatically starts the ember burnout ([Emberburnout] status).

If the [Ember burnout] button was notpressed, the boiler will flush the secondary air

ducts with air in order to free them of dust. Charcoaland embers remain in the boiler by design so thatnewly added wood can be ignited more easily.

Complete ember burnout for cleaning

To clean after the final heating mode, press the [Emberburnout] button in the log boiler overview (the buttonwill then turn yellow ).

20 www.eta.co.at

Start-up

Ember retention is then deactivated and the boilerperforms a complete ember burnout (duration approx.1 hour). Most of the coal burns in the fuel chamber,making subsequent cleaning of the boiler easier.

Only adding fuel to the fire when the fuel chamberis empty

Only add fuel when the buffer charging status isbelow 30% and the fuel chamber has burned to

empty.

Because as long as there are still embers in the fuelchamber and wood is being refilled, the boiler will au-tomatically try to ignite the wood again. If the wood ishard to ignite and there are only a few remainingembers, it may help to push the charcoal together inthe middle before refilling. If the remaining embers donot ignite the wood by themselves, light it with paperand cardboard through the ignition door.

21

Getting to know the control system ETAtouch controller

7 ETAtouch controller

7.1 Getting to know the control

system

Get to know the control system

Take your time and read the following chaptercarefully. It describes the functions and settings of theETAtouch control for your heating system. If you arefamiliar with these, it will be easier for you to make ad-justements, even without consulting the manual.

Design of the control system

The individual components of the heating system, e.g.buffer, hot water tank or heating circuit are shown inthe control system as "function blocks". These are

listed in the uppermost row on the screen. Therespective user interface is opened with a single tap ofthe finger.

Fig. 7-1: ETAtouch control system function blocks

1 Currently selected function block

2 Other function blocks, e.g. hot water tank, heatingcircuit, solar heating system

3 Scroll to other function blocks (displayed if not allfunction blocks can be displayed simultaneously)

4 This button opens an overview of all installedfunction blocks. This allows the user to switchbetween function blocks faster.

5 Help button. Details can be found in chapter 7.1.3"Integrated help".

6 Settings of the selected function block

7 Date and time

8 Current outside temperature

9 Status of the remote control for the boiler (viawww.meinETA.at), see chapter 7.1.7 "meinETAremote control"

10 System configuration

22 www.eta.co.at

ETAtouch controller Getting to know the control system

Several views are available for each function block. Toswitch between these, tap on the symbol atthe top left. The selection of views appears.

Fig. 7-2: Selection of views

1 User interface

2 Text menu

3 Inputs and outputs menu

4 Messages menu

In the user interface, you can set the mostimportant and common settings. For example,adjustment of the charging times, heating

times, room temperatures and operating modes arecontained in this list. Details can be found in chapter7.1.1 "User interface".

The parameters of a function block aredisplayed in the text menu and can be adjusted,if necessary. See chapter 7.1.2 "Text menu".

The terminal assignment of individualcomponents, such as temperature sensors,pumps and mixers, are visible within the input

and output menu, where they can be changed ifrequired. Also, for example, pumps and mixers can bestarted in manual mode. This menu is intended forspecialists only. Details can be found in chapter 7.1.5"Inputs and outputs".

Any hints, errors or faults are displayed in themessages menu, see chapter 7.1.4"Messages".

7.1.1 User interface

The user interface

The user interface is always displayed by default. Ifyou are in a different view, switch to the user view bytapping the symbol (upper left) and thenselecting .

In the user interface, you can set the most importantand common settings. The display is dependent on theselected function block. The illustrated example showsthe user interface of a heating circuit with a roomsensor.

Fig. 7-3: Heating circuit user interface

1 Operating condition and information

2 Producer for the heating circuit. Currently, the buffer provides a feed temperatureof 25 °C to the heating circuit.

3 Current room temperature

4 On/off switch for the heating circuit = switched on = switched off

5 Increase or decrease the room temperature

6 Function block settings.In this menu, the settings and functions mostcommonly used can be stored. For the heatingcircuit, for example, the heating times and theheating curve are adjusted here.

7 Graphic display of the heating times and room tem-peratures settings

8 Different operating modes of the heating circuit

23


7.1.2 Text menu

Adjust parameters in the text menu

To enter the text menu, tap in the upper left on the symbol, followed by . In the text menu, the

required parameters for the control system of thefunction block are listed. Modifiable parameters areindicated by the symbol.

Fig. 7-4: Text menu

1 Parameter

2 Current value or setting

3 Editable parameter

4 Other settings, such as adding the parameter toFavourites

Changing a parameter is simple. Select it and tap onthe symbol. The settings window appears.

Fig. 7-5: Settings window

1 Factory setting and adjustment range

2 Reset to factory setting

3 Save and close

4 Cancel and close

The default setting and the setting range are displayedon the right side. The new value is entered with thekeypad, and stored by pressing the [Save] button.

Resetting to factory settings is done by pressing the[Factory settings] button. To cancel and close thewindow, tap the arrow on the left side of the screen.

Only modify parameters whose function you'refamiliar with. Before making any changes, read

the relevant section of the user manual or configura-tion manual, or open the integrated help feature. If youcannot find sufficient information about a parameter,please consult a specialist.

Commonly used parameters can be found in thesettings

Commonly used parameters can be found in thefunction block settings ( button). There, the

parameters are identified by the symbol and can beadjusted by tapping. This saves you having to searchthrough the text menu for these parameters.

7.1.3 Integrated help

How to use the integrated help

Use the integrated help to find information. Thisappears when the button is pressed. If help isactivated, annotations will appear in the user interfacein blue fields.

Fig. 7-6: Activated help in the user interface

24 www.eta.co.at


Fields with additional line symbols on the rightside (example: ) indicate that further

information is available. Tap on the appropriate fieldand a window with the description will open. Close thewindow using the arrow on the left side.

Fig. 7-7: Description

The help function can also be accessed via the textmenu. A detailed description is available for all theparameters displayed in blue writing. Just tap on aparameter and a window will open with the description.

Fig. 7-8: Activate help in the text menu

To turn off help, press the button again.

7.1.4 Messages

An error message appears

If an error occurs, a symbol of the type of error appearsat the top of the screen in the corresponding functionblock. This is also displayed at the bottom of thescreen.

Fig. 7-9: Error message

Types of errors and their meaning

• MessageA message does not interrupt operation, andtherefore no acknowledgement is required.Messages inform the user, for example, that theblocking protection of the pumps has beenactivated.

• WarningA warning is displayed when a function that is notabsolutely essential for continued operation hasfailed. It can be acknowledged before the cause offailure is remedied. However, it will continue to bedisplayed until the cause has actually been dealtwith.

• Fault or alarmA fault or alarm stops operation. Some of thesecan be acknowledged before the cause of theproblem is remedied. However, they will continueto be displayed until the cause has actually beendealt with. Other errors and alarms can only be ac-knowledged after the cause has successfully beenremedied. Once an error or alarm has beenresolved and acknowledged, you must restart theboiler or the affected function block.

25


If there are several errors, a list appears when you tapon the error symbol at the bottom of the screen.

Fig. 7-10: Error list

Tap on the error icon at the bottom of the screen todisplay the error description.

Fig. 7-11: Error description

You can also switch to the messages menu todisplay errors. To do this, tap on the

symbol and then select the menu.

7.1.5 Inputs and outputs

Displaying the terminal assignment of individualcomponents

The terminal assignment of the individual componentsof the selected function block is displayed in the inputsand outputs menu, such as: pumps, temperaturesensors, mixers.

The terminal assignment can be changed withthe [Service] authorisation. Manual operation of a

pump or mixer, for example, is also possible.

Below is an example of the function block of theheating circuit. To view the terminal assignment, firstselect the heating circuit. To open the inputs andoutputs menu, tap on the symbol and then on

. An overview screen opens.

Fig. 7-12: Overview

Details of a component, such as the current position orthe operating state, are displayed when the symbolis tapped. Try this with the heating circuit mixing valve.A settings window appears.


With the [Service] authorisation, the heatingcircuit mixing valve can be started up manually

from the settings window with the [Open], [Stop] and[Closed] buttons. However, this is primarily intendedfor specialists.

Close the window using the arrow on the left side.

26 www.eta.co.at


7.1.6 Getting started

7.1.6.1 System settings

Opening the system settings

Tap on the symbol in the lower left of the screento open the system settings menu.

Fig. 7-14: Opening the system settings

In the system settings, the date and time is set, thelanguage of the control system is set, and access tothe remote "meinETA" system is enabled, among otherthings.

With the [Service] authorisation, the software for theETAtouch control system is also updated in this menu.

Fig. 7-15: System settings menu

To close the system configuration, simply tap on the symbol again.

7.1.6.2 Setting the language

Changing the language of the ETAtouch controlsystem

The language displayed by the control system can bechanged. To do so, open the system configuration

and tap on the [Language] symbol. A settingswindow appears.

Fig. 7-16: Setting the language

Please select the desired language. The ETAtouchcontrol system will then be displayed in the languageselected.

7.1.6.3 Setting the date and time

Setting the date and time

The date and time can be adjusted to the respectivetime zone. The date and time are set to CentralEuropean Time (UTC+01:00) from factory. To set, tapon the date or time on the screen. A settings windowappears.

Fig. 7-17: Date and time

Using the arrow keys, set the time. Tap on the datefield to open the calendar. Save the new setting andthen tap on the symbol to close the system con-figuration.

27


7.1.6.4 Changing the names of function blocks

Renaming function blocks

You can individually adapt the names of functionblocks to make them easier for you to recognise.

Be sure to keep the name short. This improvesthe clarity of the screen.

To change a name, first open the desired functionblock settings using the [Settings] button. Belowthe hot water tank function block is explained.

Fig. 7-18: Function block settings

An overview of the setting options appears. Thesedepend on the function block and can vary in number.

Fig. 7-19: Overview of the settings menu

To change the name, tap on the [Change name]symbol. An on-screen keyboard appears in order toenter the new name.

Fig. 7-20: On-screen keyboard

Press the [Save] button to save. To cancel, close thewindow using the arrow on the left side.

7.1.6.5 Switch between function blocks

The principle of "producers" and "consumers"

In the user interface, the "producer" of the functionblock and (if present) also the "consumer(s)" aredisplayed. Producers are those components of theheating system that produce heat, for example theboiler or the buffer. Consumers are those componentswhich absorb the heat, for example the heating circuitor the hot water tank.

The principle of "producers" and "consumers" areexplained using the example of the buffer below. Thebuffer is charged by the boiler. The boiler is a"producer" for the buffer, and the buffer is a"consumer" of the boiler.The heating circuit and the hot water tank areconnected to the buffer. Thus, the buffer is a producerfor the two consumers, namely the heating circuit andthe hot water tank.

28 www.eta.co.at


In the user interface, producers for the functionblock are always displayed on the left side and

consumers on the right side.

Fig. 7-21: Consumers and producers in the overview

1 Producers (in this example the boiler)

2 Consumers (e.g. heating circuit, hot water tank)

These symbols are also used to navigate. Forexample, tapping the symbol of the producer

( )switches to its function block. The same workswith the symbol of the consumer ( ). If severalproducers or consumers are present, a selectionwindow appears.

Fig. 7-22: Selection window

The symbols for both producers and consumersvary between the function blocks.

7.1.6.6 Setting a time window

Setting the charging and operation times

In some function blocks, the time window for chargingthe tank (for example the buffer and hot water tank), orthe operating times (for example for the heating circuit)are set. This time window must be created in thesettings of the respective function block.

Subsequently, the setting of the charging timesand temperatures will be described in relation to

the hot water tank. This example applies accordingly toother function blocks.

Open the overview of the time window settings

1. Open the settings for the function block with the [Settings] button.

Fig. 7-23: Open the settings

2. Access the charge times of a particular day withthe [Charging times Daily plan] button.

Fig. 7-24: Access charging times

29


3. An overview screen opens.

Fig. 7-25: Overview

1 Selected time window (charging times or operatingtimes)

2 Select day of the week

3 Add another time window

4 Graphical representation of the time windowsetting

5 Overview of all time windows for the entire week

6 Delete time window

7 Adjustable target temperature.This is dependent on the function block, and, in thisexample, corresponds to a hot water temperatureof 55 °C.

8 Period of the time window. In this example, the hot water is charged between08:00 a.m. and 8:00 p.m. to 55 °C.

9 Set-back temperature.Outside the time window, the hot water is chargedto this set temperature.

Setting the time window is described below.

Setting the charging times

1. In the overview, select the charge time. In eachfield, use the arrow keys ( , ) to set thetime and temperature.

Fig. 7-26: Setting time slot and temperature

In this example, the hot water is charged between08:00 a.m. and 8:00 p.m. to 55 °C

2. If an additional time window is necessary, add itusing the button. Adjust as described above.

A maximum of 3 time windows can be set. Todelete an unnecessary time window, press

the button in the selected time window.

3. For the period outside of the set charging times, areduced temperature can be set. To adjust thesettings, select the [Set-back temperature outsidethe time window] field and use the arrow keys toselect the desired temperature.

Fig. 7-27: Reduced operation temperature settings

In this example, the desired hot water temperatureoutside the charging times is 30 °C.

When loading times and temperatures of a day of theweek have been set, they can be copied to other daysof the week.

Copying time windows

In the following example, the time windows fromWednesday are copied to Saturday and Sunday.

30 www.eta.co.at


Time windows from Wednesday copied toSaturday and Sunday.

1. In the overview, press the [Weekly plan] buttonto switch to view all days of the week.

Fig. 7-28: Copying time windows to days of the week

2. This opens an overview of time windows for alldays of the week. First, choose the day of the weekto copy (this is framed) and then press the [Copyselected day] button.

Fig. 7-29: Overview

3. Now, select the days of the week for which the timewindow is to be copied. In this example Saturdayand Sunday.

Fig. 7-30: Select days of the week

Pressing the [Mark all days] button marks all days.

4. Press the [Save] button to save. The overview willbe updated accordingly. Close the window usingthe arrow on the left side.

You can also access the week overview via thefunction block settings ( button). For this,

press the [Charging times Weekly plan] button inthe settings.

7.1.6.7 Key lock for the control system

Function of key lock

The "Key lock" function protects the settings in thecontrol system against accidental changes by, forexample, children or unauthorised persons. To activate the key lock, first the authorisation must beincreased to [Service] in the system settings. Thenswitch to the system settings in the [Global Settings]menu and press the [Key lock] button. An overviewscreen opens.

Fig. 7-31: Overview of the key lock

Enable key lock with the on/off switch .Afterwards you can choose between a partial lock([Partial lock]) and a complete lock ([Full lock]). Inpartial lock, only the basic functions are operable. Infull lock, you can only switch between the functionblocks.Use the [Code define] button to define the code todeactivate the key lock (unlock code) and save it. If youconfirm this message, the key lock is activated.

If you forget the unlock code, please contact ETAcustomer service. They can deactivate the key

lock again.

31


If the key lock is active, a message appears promptingyou to enter the unlock code when you press a buttonor before you can change a parameter.

Fig. 7-32: Message

The only way to temporarily unlock the keypad is toenter the unlock code. However, this will automaticallyenable itself again after some time, for example assoon as the screen saver starts.

To deactivate the key lock, switch to the [Key lock]menu and turn off the key lock with the switch.

7.1.7 meinETA remote control

Remote control of the boiler via the internet

All boilers with the ETAtouch control system can becontrolled remotely via smartphone, tablet or PC. Theboiler's touch screen is connected to the Internet via anetwork cable.

A LAN socket near the boiler is required for the internetconnection. If none are available, an internetconnection can be established using a dLAN adaptervia the in-house power grid. This dLAN adapter is alsoavailable from ETA.

Fig. 7-33: dLAN network

Worldwide access via www.meinETA.at

Remote control via the free internet platformwww.meinETA.at.After registering on this platform, the boiler can becontrolled remotely. It can be accessed bysmartphone, tablet or PC and is, of course, protectedby username and password. You can also access theboiler's control system via your home network with afree VNC Viewer. To see how remote operation of yourboiler works, please visit www.meinETA.at.

32 www.eta.co.at


Entering access data for the boiler remote control

After receiving your login information (after registeringon "www.meinETA.at"), enter it in the system configu-ration in the [meinETA Access] menu. This enablesaccess to remotely control the boiler.

To enter the login information, open the systemsettings ( symbol, bottom left) and switch to the[Internet & interfaces] menu. Then press the [meinETA Access] button.

Fig. 7-34: Entering login details

The upper area indicates whether an internetconnection to the screen is established. If there is

no connection, it must be established first.

Enter your login information and the type plate numberof the boiler (if this is not displayed) in the relevantfields. To enter, press the symbol to open the on-screen keyboard.

Fig. 7-35: On-screen keyboard

Then press the [Register now] button. The activation isnow performed (if an internet connection is available).If this is successful, the symbol for remote

control appears at the bottom of the screen. If an erroris displayed, check the access data and the internetconnection.

Fig. 7-36: Settings window for remote control

After successful activation, options for remote controlappear in the settings window. These can be turned onor off with the ( ) selector switch:

• [Start local VNC service IP address: ]:You can also access this via the free VNC Vieweron your boiler.

• [Send messages to meinETA server]:Messages are then also displayed on the platform"www.meinETA.at".

• [Establish a meinETA connection]:Permit or block remote control via the platform"www.meinETA.at". If this option is turned off, theremote control is also switched off and thereforethe boiler is not visible on "www.meinETA.at". Thesymbol of the remote control changes to .

• [Full access]:Thus, access is cut off remotely, but the controlsystem still remains visible on "www.meinETA.at".The symbol of the remote control changes to

. Changes to the control system can only beperformed on-site. This is to ensure that nochanges can be remotely performed on yourcontrol system.

You can change the options at any time bypressing the remote control symbol at the bottom

of the screen.

33


7.1.8 Favourites

The "Favourites" function

With the "Favourites" function you can collect anyparameter from the text menu (and from other functionblocks) in groups, so-called "Favourites". You can, forexample, create a favourite group with the currentbuffer temperature, hot water temperature andcollector temperature. Another group could contain theoutside temperature and several room temperatures.In this way you gain a quick overview of any values thatare important for you. Naturally, parameters can beadded or deleted at any time.

First create or designate a favourite group so it iseasier to assign parameters later on. To do so, openthe system configuration and tap on the [Fa-vourites] symbol. An overview screen opens.

Fig. 7-37: Overview of favourite groups

If another group is required, add it with the [Newgroup] button. With the pen symbol you canrename a favourite group and delete it with the button.

Parameters that have already been added aredisplayed with the button. You can change

the display sequence with the arrow keys. With the button you can delete a parameter from this group, andwith the button you can copy it to another group.

Fig. 7-38: Editing parameters

Adding parameters to favourites

Adding parameters to favourites groups takes place inthe text menu of the corresponding function block. Inthe following example, the current hot watertemperature is added to favourites.

First, change in the function block of the hot water tankto its text menu. For parameters [Hot water tank] on theright edge of the screen tap on the symbol.

Fig. 7-39: Adding parameters

In the settings window that opens tap on the [Fa-vourites] button.


The overview of the favourite groups appears. With the button choose any group to which you want to add

parameters. You can also select several groups.

Fig. 7-41: Overview

Other parameters are added in the same way.

34 www.eta.co.at


Displaying the values of the favourites parameters

If parameters are added to favourites, the symbol forthe favourites also appears next to the text menusymbol . Tap on this to see the individualparameters.

Fig. 7-42: Display favourites

An overview screen opens.

Fig. 7-43: Overview

To close this overview tap the symbol andselect the user view , for example.

7.1.9 USB camera

Connecting the USB camera to the control system

There is the option of connecting a USB camera to afree USB port of the control panel. You can use this tomonitor the stock of your fuel store, for example.

So that the USB camera is recognised by thecontrol system it must be suitable for "Windows

XP" or "Windows Vista". For example: "MicrosoftLifeCam Studio", "Logitech HD Pro Webcam C920" or"SpeedLink Reflect LED Webcam". A maximum linelength of 40 m is possible when a USB 2.0 (or later)extension cable is used with signal amplification(active).

Displaying the camera image

1. Connect the camera to a free USB port on theETAtouch control panel.

2. Open system configuration and switch to the[Global Settings] menu. Press the [Camera]button and then the [USB cable] button.

3. The button starts and stops the transmission ofthe camera image.

Fig. 7-44: Displaying the camera image

35

[Boiler] function block – log boiler ETAtouch controller

7.2 [Boiler] function block – log

boiler

Boiler overview

1 Operating condition and information.A description of the operating conditions can befound in the integrated Help menu by pressing the

button.

2 Exhaust temperature

3 Residual oxygen content of flue gas

4 Buffer charging status

5 Switch off boiler. This switch is used only to switch off the boilerwhen it is not heated. The boiler is automaticallyswitched on by opening the insulation door.

6 [Ember burnout] button.Thus, ember retention is deactivated and the boilerperforms a complete burnout.

7 [Measurement] button.The menu for emission measurement of the boileris opened.

8 [Settings] button.In this menu, the settings and functions mostcommonly used can be stored.

9 Feed temperature and return temperature

10 Producer for the boiler (TWIN pellet burner)This is only displayed if a TWIN pellet burner is ad-ditionally installed.

Boiler functionality

When the insulating door is opened, the draught fanstarts automatically and the switch changes to the

setting. The operating condition changesfrom [Ready] to [Insulation door open]. The open

insulation door is shown on the display. If the log boileris not being started up immediately, it can be switchedoff with the switch.

If the insulation door stays open for more than30 minutes, an error message appears on the

screen. If a TWIN burner is connected to the log boilerand the insulation door stays open longer than1 minute, the TWIN burner is switched off by thecontrol system, which assumes that the log boiler isbeing started up.

Once the fuel is ignited and the exhaust temperature isabove 100 °C, close the ignition door and theinsulating door. The boiler switches to [Ignition] andlater to [Heating] mode.

After heating, if the fuel in the boiler has been burnedand the exhaust temperature drops below 80 °C, theboiler begins a burnout and subsequently switches to[Ready] mode.

After the heating operation, some charcoal andembers will remain in the boiler by design so that

new fuel can be ignited more easily when it is addedlater. This function is also called the "ember retention"function. If this function is not desired, for examplebecause the boiler is to be cleaned afterwards, it canbe turned off (during heating) by pressing the button. The button is then highlighted in yellow .

7.2.1 Operating elements

[Ember burnout] button

This button can only be pressed during heatingmode. It switches off the "ember retention"function. When shut off, the button is

highlighted in yellow . The boiler then carries out acomplete ember burnout, so that no embers remain inthe fuel chamber.

[Measurement] button

For emission measurement, the wood chip boilermust already be in heating mode.

When this button is pressed, a settings windowappears for the emission measurement. Usingthe [Begin measurement] button, a date for

sweeping of the chimney can be selected. The boilermust be heated up in time to reach the operating

36 www.eta.co.at

ETAtouch controller [Boiler] function block – log boiler

temperature for measurement. By pressing the [Startnow] button, the boiler will immediately beginpreparations for a subsequent measurement.

Fig. 7-45: Settings window for emission measurement

In addition, the locking time of the boiler can beadjusted in the settings window ( [Lock duration]button). This relates to the set time of the measure-ment. Within this period, a message appears that theboiler is not to be heated up, so that the heating systemhas time to cool.

The [Deactivate measurement] button ends theemission measurement and switches the boiler back tonormal mode.

37

[BufferFlex] function block - log boiler ETAtouch controller

7.3 [BufferFlex] function block - log

boiler

"BufferFlex" overview

The consumers appear in the overview with differentlevels to the right of the buffer, and the heat producersto the left of the buffer. The following graphic shows abuffer with four temperature sensors andtwo consumer levels.

Fig. 7-46: Overview


button.

2 Producer for the buffer

3 Current buffer charging status

4 Temperatures of the buffer in the individual areas

5 Buffer consumers.Both consumer levels are currently charged withdifferent flow temperatures

6 [Settings] button.Temperature warnings for the buffer can be set inthis menu.

Mode of operation

By means of the temperature sensors on the buffer, thecurrent charging status is determined and displayed inthe overview screen. It is needed to determine thecorrect amount of firewood to add. The buffer ischarged by the log boiler as soon as the buffer meetsthe necessary criteria.

7.3.1 Setting warnings

Set temperature warnings

As an option, limit values can be set for two differenttemperature sensors so that a warning is issued if theyare undershot or exceeded. The [Service] access level is required to make modifi-cations. Then open the settings ( button) and pressthe [Sensor assignments] button. In the overview,select [Temperature warning 1] or [Temperaturewarning 2].

Fig. 7-47: Set temperature warnings

If the allocation is set to [no association], thetemperature warning is deactivated.

In the text menu, a delay time can be defined with the[Duration until warning] parameter before the warningappears.

38 www.eta.co.at

ETAtouch controller [BufferFlex] function block - log boiler

7.3.2 Buffer with solar heating system

"BufferFlex" with solar heating system

The control principles of the solar heating systemand the different variations are described in

chapter 7.7 "[Solar] function block".

In the overview of the buffer, the solar heating systemappears as another producer for the buffer. In thesubsequent graphic, the buffer is charged by the solarheating system at a flow temperature of 98 °C.

Fig. 7-48: Solar heating system on the buffer

If a stratified charger for the buffer is installed, the solarheating system can charge the upper and lowerportion of the buffer. The solar heating system isdisplayed twice.

Fig. 7-49: Stratified charging of the buffer

In the "BufferFlex" text menu, different settingsfor the [Solar storage strategy] parameter are

possible (see chapter 7.3.4 "Text menu - Adjustableparameters", parameter [Solar storage strategy]) forstratified charging of the buffer by the solar heatingsystem.

7.3.3 Buffer as a combination tank

"BufferFlex" with integrated hot water tank or coils

The current hot water temperature is shown at the topof the screen by the water tap icon.

Fig. 7-50: Combination tank

In the settings menu ( button), the time window forthe loading of the hot water and the desired hot watertemperature can be set (see chapter 7.3.3.1 "Settingthe hot water charging times").

39


7.3.3.1 Setting the hot water charging times

Opening charging times and temperature for hotwater with a combination tank

The charging times for the hot water and the set tem-peratures can be adjusted in the settings ( button).To adjust, open the settings and then open thecharging times of any given day with the [Hot waterCharging times Daily plan] button. An overview screenopens.

Fig. 7-51: Overview

1 Set time window (charging times)






7 Adjustable hot water temperature within the timewindow

8 Period of the time window

9 Set-back temperature of the hot water outside thetime window

Setting the time window and copying to otherdays of the week is described in chapter 7.1.6.6

"Setting a time window".

40 www.eta.co.at


7.3.4 Text menu - Adjustable parameters

Adjustable parameters

For the basic function of the buffer, the respectivetemperature sensors must be assigned in the

buffer settings. Some of the following parameters canalso be found in the settings of the BufferFlex [Sensorassignments].

If a solar heating system is additionally connected tothe buffer, further parameters can be set.

If the buffer is implemented as a combination tank,further parameters can be set.

Detailed descriptions of the parameters are providedbelow.

Explanation of [Solar storage strategy]

Various settings can be made for stratified charging ofthe buffer by the solar heating system.

• [Charging by demand]: The current demands of the consumers on thebuffer and the set minimum temperature of thesolar heating system ([Buffer top min. solar]) areused to calculate the temperature required forbuffer charging. The solar heating system will onlybegin to charge the buffer once the collectortemperature is greater than the calculatedtemperature (for charging the buffer).

• [Optimise yield]: The solar heating system will begin to charge thebuffer as soon as the collector temperature isgreater than the current buffer temperature.

• [Charging according to buffer top min. solar]: The solar heating system only begins to charge thebuffer once the collector temperature is greaterthan the set minimum temperature of the solarheating system ([Buffer top min. solar]).

Explanation of [Buffer top min. solar]

Optional: only for solar heating systems with stratifiedcharging

With stratified charging by the solar heating system,this sets a minimum temperature for the top section ofthe buffer. This way, solar charging only takes place inthe top section once the solar panel is at least 7 °Cwarmer than [Buffer top min. solar].

However, this minimum temperature only appliesif the conditions for stratified charging are

satisfied. If they are not, solar charging is switched tothe bottom section of the buffer, to make use of thesolar energy.

Explanation of [Buffer max]

This configurable shutdown temperature sets athreshold for how much the buffer can be charged bythe solar heating system, to prevent the buffer fromoverheating. If the allocated temperature sensorreaches the configured shutdown temperature, thesolar pump of the solar heating system is switched off.

Explanation of [Priority]

Optional: only with solar heating system and bufferwith 2 internal coils

Buffer

Solar producer

Solar storage strategya

a. Only visible with stratified charging of the buffer

Buffer top min. solara

Buffer max

Priority bottom

Priority topa

Consumersb

b. Only visible with a single consumer level

Extra solar heat

from outside temp.

from accumulator tank temperature

Consumer levelsc

c. Only visible with multiple consumer levels

Consumer 1 (top) (applies also to [Consumer 2] and [Consumer 3])

Excess solar heat

from outside temp.

from accumulator tank temperature

Buffer

Hot water area

Switch-on diff.

Circulationa

a. Only visible with additional circulation pump

Circulation runtime

Circulation pause

Enable circulation

41


This parameter sets the priority of the top and bottomsections of the buffer for solar charging. A high prioritymeans that this section will be charged by the solarheating system first. A low priority means that it will becharged last.

Explanation of [Extra solar heat]

This parameter indicates whether the buffer is transfer-ring the excess heat from the solar heating system tothe consumers, even if they currently do not need heat. With the [No] display, the buffer will not transfer anyexcess solar heat. If [Yes] is displayed, excess so-lar heat is forwarded.

The following conditions must be met in order forthe excess solar heat to be passed on in this way:

• The current outside temperature must be higherthan the adjustable value [from outside temp.].

• In the function block for the hot water tank, heatingcircuits or other buffer storage tanks, the [Solarheat diss.] parameter must be set to [Yes].

• The following temperatures must be exceeded inthe buffer:

–If the [Buffer] function block is configured, the[Buffer top] temperature must be above theconfigurable value [at buffer top] and the[Buffer bottom Solar] temperature above thevalue [at buffer bottom sol.].

–If the function block [BufferFlex] isconfigured, the temperature [from accumulatortank temperature] at the allocated tempera-ture sensor must be exceeded.

Explanation of [Switch-on diff.]

Optional: only with combination tank

With a combination tank, this parameter regulates howfar the current warm water temperature can fall beforethe hot water tank again demands heat from the boiler.

If the value is set to 15 °C, the current hot watertemperature may drop by 15 °C from the value

[Hot water tank target]. The combination tank does notdemand heat from the boiler unless this happens.

With a combination tank, this value can be set toapproximately 5°C to 8°C if the amount of hot

water is insufficient.

Explanation [Circulation runtime]

Optional: only for circulation pump

This parameter specifies the duration for operating thecirculation pump after it has been started by the controlsystem. Once this time has expired, the circulationpump is switched off for the set duration [Circulationpause].

Example:[Circulation runtime] = 3 minutes[Circulation pause] = 10 minutesIf the circulation pump has been started, it is inoperation for 3 minutes and then disabled for10 minutes. This means that it can only be requestedagain by the control system after 13 minutes.

You can determine the required running time ofthe circulation pump in the following way. Start

the circulation pump in the control system by means ofmanual operation in the inputs and outputs menu. Afterstarting, measure the time until the fresh water modulewarms up the return line for the circulation. This time(e.g. 3 minutes) is required to heat the hot water pipe.Then enter this time in parameter [Circulation runtime]. During this time measurement, no hot water may betapped (e.g. by sink, shower ...), because otherwise anincorrect time is measured.

Explanation [Circulation pause]


This parameter sets the pause after a circulation pumpoperation. The control system can only restart thecirculation pump after this pause/break has expired.


Explanation of [Enable circulation]


This parameter defines the minimum temperature ofthe hot water tank for starting the circulation pump. Thecirculation pump only starts once the hot water tankhas exceeded this temperature.

42 www.eta.co.at


43

[Hot water tank] function block ETAtouch controller

7.4 [Hot water tank] function block

Hot water tank overview screen


button.

2 Producer for the hot water tank.Currently, the hot water storage tank is charged bythe buffer with a flow temperature of 61 °C, andfrom the solar system with 74 °C.

3 Temperature of the hot water tank. The temperature in the lower area of the tank onlyappears if an additional temperature sensor isinstalled.

4 [Immediately charge hot water] button.Immediate charging of the hot water, independentof the set time slots.

5 [Settings] button.In this menu, the time window can be set, forexample.

[Immediately charge hot water] button

This button causes the hot water to be chargedto the highest set temperature of all time slotsand days of the week if the current temperature

has dropped below [Switch-on diff.], ignoring thecurrent time slot. When active, the button is highlightedin yellow .

Mode of operation

In the settings menu ( button), the time window forcharging the hot water and the desired hot watertemperature can be set. See chapter 7.4.1 "Setting thehot water charging times".

Within the charging times, the hot water is charged tothe set hot water temperature (for example: 60 °C).The charge starts as soon as the current hot watertemperature is lower than the set hot watertemperature by the adjustable difference [Switch-ondiff.].

Example: In the time window, the hot water temperature is set to60 °C. The difference [Switch-on diff.] is 15 °C. => Charging starts as soon as the hot watertemperature drops to 45 °C, and it ends as soon as thehot water has reached 60 °C.

If an additional temperature sensor [] is installedfor the lower part of the hot water tank, charging

ends as soon as this sensor has reached the configu-rable temperature [HW bottom off].

44 www.eta.co.at

ETAtouch controller [Hot water tank] function block

7.4.1 Setting the hot water charging times

Open the overview screen of the set chargingtimes and temperatures

The charging times for the hot water and the set tem-peratures can be adjusted in the settings ( button).To adjust, open the settings and then open thecharging times of any given day with the [Chargingtimes Daily plan] button. An overview screen opens.

Fig. 7-52: Overview

1 Set time window (charging times)









If an additional circulation pump for hot water isinstalled, the operating times of this are set in the

same way ( [Circulation times Daily plan] button).




Commonly used parameters can be found in thesettings

Commonly used parameters can be found in thefunction block settings ( button). There, the

parameters are identified by the symbol and can beadjusted by tapping. This saves you having to searchthrough the text menu for these parameters.



Explanation of [Switch-on diff.]

This parameter regulates how far the current warmwater temperature can fall before the hot water tankagain demands heat from the buffer or boiler.

If the value is set to 15 °C, the current hot watertemperature may drop by 15 °C from the value

[Hot water tank target]. The hot water tank onlydemands heat from the buffer or boiler when thishappens.

Explanation of [HW bottom off]

Optional: only with additional [Hot water tank bottom]temperature sensor

This parameter defines when charging of the hot watertank will end. As soon as the additional [Hot water tankbottom] temperature sensor in the hot water tankreaches the adjustable [HW bottom off] temperature,charging of the hot water tank ends.

Hot water tank

Switch-on diff.

HW bottom offa

a. Only visible with additional temperature sensor

Solar heat diss.b

b. Only visible for buffers with solar heating system

Priorityc

c. Only visible for solar heating systems with switchover between several tanks

Circulationd

d. Only visible with additional circulation pump

Circulation runtime

Circulation pause

45

[Hot water tank] function block ETAtouch controller

Explanation of [Solar heat diss.]

Optional: only for accumulator tanks with solar heatingsystem

This parameter defines whether the hot water tankmay take excess solar heat from the buffer. If this parameter is set to [Yes], the hot water tank takesthe solar excess up to the maximum temperature [Hotwater tank max.].

This parameter is factory-set to [No]. You mustcheck the conditions for the [Extra solar heat]

function in the text menu of the accumulator tank.

Explanation of [Priority]

Optional: only for solar heating systems withswitchover between several tanks

This parameter sets the priority for solar charging ofthe hot water tank. A high priority means that this tankwill be charged by the solar heating system first. A lowpriority means that it will be charged last.











46 www.eta.co.at

ETAtouch controller [Hot water tank] function block

47

[Fresh water module] function block ETAtouch controller

7.5 [Fresh water module] function

block

Fresh water module overview screen


button.

2 Producer for the fresh water module.Currently, the fresh water module is charged by thebuffer at a flow temperature of 58 °C.

3 Primary side return temperature

4 Circulation pump (only displayed if it has beeninstalled and is in operation)

5 Hot water temperature (the tap is displayed onlywhen hot water is currently being drawn)

6 [Settings] button.In this menu, the time window can be set, forexample.

Function of the fresh water module

The desired hot water temperature is set with the po-tentiometer on the fresh water module. If in the config-uration the [Target value can be set with rotary knob]option has been disabled, different time windows andhot water temperatures can be set. See chapter on7.5.1 "Setting the hot water charging times".

Inside these time windows, the upper part of the bufferis maintained at no lower than the configured hot watertemperature. Outside the set time windows, the hotwater is maintained at the lowest set temperature ofthe time windows, provided that the accumulator tankis sufficiently hot.

If an additional circulation pump for hot water isinstalled, the different operating modes for this

pump are set in the same way. See the followingdescription for this.

Operating modes for the circulation pump

There are two ways to operate the circulation pump.Either through automatic detection of the operatingtimes ("self-learning" function, often referred to as"auto loop") or manual specification of the operatingtimes (set time window).

• "Self-learning" function:This is already set at the factory (= parameter [Self-learning] to [Yes]). The hot water tappings of thepast 2 weeks are stored for automatic determina-tion of the daily operating times. On the basis ofthis, the operating times of the current day arecalculated and the circulation pump is started in atimely manner.

In this operating mode, the circulation pump startsas soon as hot water is drawn (detected by the flowsensor in the fresh water module). The pump willthen run for a while and subsequently pause.These runtimes and pauses are configurable(=parameter [Circulation runtime] and [Circulationpause]).

After commissioning, no more data isavailable for the "self-learning" circulation.

That is why an operating period of about 4 weeksis required in the beginning, so that the controlsystem can save sufficient data.

• Setting a time window:To do this, the "self-learning" function must beswitched off (= parameter [Self-learning] to [No]). The operating times of the circulation pump arenow set manually, for example from 10:00 am to2:00 pm . Within these time windows, thecirculation pump alternately starts and pauses,

48 www.eta.co.at

ETAtouch controller [Fresh water module] function block

based on the set runtimes and pauses, regardlessof whether hot water is currently being drawn ornot.

Example: Time window = 10:00 am to 2:00 pm[Circulation runtime] = 5 minutes[Circulation pause] = 10 minutes=> The pump runs from 10:00 am to 10:05 am ,then pauses until 10:15 am , restarts at 10:15 am,pauses from 10:20 am to 10:30 am , and so on ...until the end of the time window at 2:00 pm .

In this operating mode, the circulation pumpcan also start outside of the time window

when hot water is being tapped. This is useful if, forexample, the time window ends at 8:00 pm andyou shower at 9:30 pm . When you then turn on thehot water briefly, the circulation pump starts, andyou will have hot water for showering shortlyafterwards. This runtime (outside the time window) is set in thetext menu (parameter [Circulation pump delay]).Enter the same value as parameter [Circulationruntime].

7.5.1 Setting the hot water charging times

Open the overview screen of the set chargingtimes and temperatures

The standby times for the hot water and the set tem-peratures can be adjusted in the settings ( button).To adjust, open the settings and then open the standbytimes of any given day with the [Stand-by timesDaily plan] button. An overview screen opens.

Fig. 7-53: Overview

1 Set time windows (standby times)











If a circulation pump is also installed (and thefunction [Self-learning] is switched off), these

operating times are set in the same way (button [Circulation times Daily plan]).

Circulation

Circulation pump delay

49

[Fresh water module] function block ETAtouch controller




Explanation of [Automatic venting]

This function attempts to remove introduced air fromthe fresh water module automatically.If the function is activated and the controller detects airintake, both pumps are operated at full speed for ashort period of time to remove the air from the freshwater module. This can also take place multiple timessequentially.

This function is activated by default. Duringventing, the hot water can briefly be hotter than

the target temperature set.

Explanation of the [Emergency operation only withbuffer pump] function

Emergency operation of the fresh water module can beactivated with this function if the admixing pump isdefective. If it is activated, water heating is only provided by thebuffer pump. Without the admixing pump, calcificationprotection of the heat exchangers is not guaranteedProtracted emergency mode can therefore calcify theheat exchanger.

Explanation of the function [Self-learning]

With this function, the operating times of the circulationpump of the last 2 weeks are saved. The operatingtimes of the current day are calculated based on thisand the circulation pump will be put into operation ac-cordingly. This function is also called the "Auto Loop"function.

This function is set to [Yes] by default. If [No] isset, the operating times for the circulation pump

can be set manually.











Explanation [Circulation pump delay]


If a time is set for this parameter, then the circulationpump also starts outside the time window set. This isuseful if, for example, the time window ends at 8:00 pmand you shower at 9:30 pm. When you then turn on thehot water briefly, the circulation pump starts, and youwill have hot water for showering shortly afterwards. Enter the same value for this parameter as forparameter [Circulation runtime].

Hot water

Automatic venting

Emergency operation only with buffer pump

Circulation

Self-learning

Circulation runtime

Circulation pause

Circulation pump delay

50 www.eta.co.at

ETAtouch controller [Fresh water module] function block

51

[Heating circuit] function block ETAtouch controller

7.6 [Heating circuit] function block

Overview of the heating circuit when a roomsensor is installed

The following graphic shows a heating circuit withunderfloor heating. If the heating circuit is equippedwith radiators a radiator also appears in the overview.

Fig. 7-54: Underfloor heating with room sensor


button.

2 Producer for the heating circuit

3 Feed temperature for the heating circuit

4 Current room temperature

5 On/off switch for the heating circuit = switched on = switched off

6 Increase or decrease the room temperature

7 [Settings] button.In this menu, the heating times and the heatingcurve can be adjusted, for example.

8 Graphic display of the heating times and room tem-peratures settings

9 Operating mode [Timer]

10 Operating mode [Set-back]

11 Operating mode [Heating]

Fig. 7-55: Overview with radiators

Overview of the heating circuit without roomsensors

In the overview, a temperature slider appears, ratherthan the measured room temperature.

Fig. 7-56: Underfloor heating without room sensor

Mode of operation

If the heating circuit is turned on ( ), heat issupplied on the basis of the time windows set. Thetemperature is controlled with the heating curve (seechapter 7.6.3 "The heating curve"), the optional roomsensor and the time window settings (see chapter7.6.2 "Setting the heating time slots").

During a time window, the heating circuit is in heatingmode. If a room sensor is installed, this regulates theheating circuit so that the set room temperature isachieved. If a room sensor is not installed, the heatingcircuit is controlled with the heating curve for theheating mode. Accurate temperature control istherefore difficult.

Outside the set time slots, the heating circuit is inreduced operation mode. This means that the roomsensor only regulates to the set reduced roomtemperature [Set-back temperature outside the timewindow]. Without a room sensor, the heating circuit iscontrolled with the heating curve for the reducedoperation mode.

52 www.eta.co.at

ETAtouch controller [Heating circuit] function block

Switching between heating and reduced operationtakes place automatically when the button is usedin the user interface to select the [Timer] operatingmode.

The operating modes are also manually adjustable.Heating mode is activated with the button, andreduced operation mode with the button. Seechapter 7.6.1 "Operating elements".

7.6.1 Operating elements

[Timer] button

The heating circuit is switched to automaticmode. This means that changing betweenoperating modes [Heating] (within a time

window) and [Set-back] (outside a time window) isbased on the set time window. This operating mode isenabled by default if the heating circuit is turned off andthen turned back on.

[Heating] button

Thus, the heating circuit is manually switchedto heating mode. With the additional switch

(above the symbol), the heatingcircuit can be set to remain permanently in heatingmode, thus ignoring any time window, or settemporarily until the next time window.

[Set-back] button

Thus, the heating circuit is manually switchedto reduced operation mode. With the additionalswitch (above the symbol), the

heating circuit can be set to remain permanently inreduced operation mode, or set temporarily until thenext time window.

Temperature slider

This slider is only displayed if a room sensor isinstalled for the heating circuit. The temperatureslider is used to adjust the desired roomtemperature in a range of +/- 5 °C. By sliding the

switch into the blue area of the scale, the flowtemperature is lowered, and thus the roomtemperature also. In the red area, the flow temperatureis raised.

Adjusting the required room temperature

This field is only displayed if a room sensoris installed for the heating circuit. The arrowsare used to set the required room tempera-

ture. In heating mode, an increase of 1 °C causes theroom temperatures of all time slots for all days of theweek to increase by this value.

In reduced operation mode, a reduction by 1 °Ccauses the reduced temperature for all days of theweek to decrease correspondingly.

53


7.6.2 Setting the heating time slots

Open the overview screen of set heating times

The operating hours of the heating circuit (heatingtimes) can be adjusted in the settings ( button). Toadjust, open the settings and then open the heatingtimes of any given day with the [Heating times Dailyplan] button. An overview screen opens.

Fig. 7-57: Overview

1 Set time window (heating times)






7 Adjustable room temperature.This is displayed only when an optional roomsensor is installed.


9 Set-back temperature.The room temperature may drop to this valueoutside the time window.



Setting absent time (holiday function)

In each heating circuit, a time frame can be defined forreduced operation mode. The heating circuit is thenoperated with the lowest set-back temperature. Thisfunction is also called the holiday function.

To set the holiday function, open the heating circuitsettings ( button), and press the [Vacation]button. A settings window appears.

Fig. 7-58: Holiday function

1 Start of the period

2 End of the period

Tap the date field to open a calendar to select the date.Enter the time using the arrow keys. Close the windowusing the arrow on the left side.

In the above example, the heating circuit operates inreduced operation mode from 10 November at 08:00a.m. until 24 November at 1:00 p.m. After expiry of theperiod, the heating circuit independently reverts toautomatic mode.

During the set holiday time period, the heatingcircuit is operated only in reduced-temperature

mode. Therefore, you must check the set heating limitfor reduced-temperature mode (see chapter 7.6.3.2"Setting the heating limits"). At settings below 0 °C,there is a risk of freezing.Also check the reduced room temperature outside ofthe heating times (see Fig. 7-57: "Overview"). If theroom temperature is set too low, there is a danger offreezing.

54 www.eta.co.at


7.6.3 The heating curve

Description of the heating curve

The heating curve regulates the flow temperature forthe heating circuit. Each heating circuit has its ownheating curve, as underfloor heating requires differentsettings from radiators.

The heating curve is adjusted in the settings of theheating circuit ( button). Open this and then changethe heating curve in the menu with the [Heat curve]button. The settings for the heating curve aredisplayed.

Fig. 7-59: Heating curve settings

1 Heating curve for heating mode (red line) andreduced operation mode (blue line)

2 Parameters for setting the heating curve and theheating limits

3 Change settings for the heating curve in heatingmode or reduced operation mode

The two adjustable parameters [Flow at -10 °C]and [Flow at +10 °C] are used to define the

heating curve for the heating mode (red line in thediagram). The resulting line is the heating curve of theheating mode (within the preset heating times). The heating curve for reduced operation mode (blueline in the diagram) is determined by a parallel shift ofthe heating curve of the heating mode. This shift is setvia the [Set-back difference] parameter.

Based on the current outside temperature, the controlsystem uses the heating curve to calculate therequired feed temperature for the heating mode. Forexample, an outside temperature of -10 °C wouldresult in a feed temperature of 33 °C (see diagram).

Fig. 7-60: Heating curve of underfloor heating

1 Maximum flow temperature

2 Parameter [Flow at -10 °C] is used for adjusting theheating curve for outside temperatures belowfreezing

3 Parameter [Flow at +10 °C] is used for adjustingthe heating curve for outside temperatures abovefreezing

4 Heating threshold for heating mode

5 Heating limit for reduced-temperature mode

If an ETA room sensor is installed for the heatingcircuit, the flow temperature calculated on the

basis of the heating curve is corrected. The actual flowtemperature will then differ from the calculatedtemperature value.

For each heating circuit, separate heating limits areadjustable for heating mode (within the set heatingtimes) and reduced operation mode (outside the setheating times). If the current outside temperatureexceeds the configured heating temperature (forexample 18 °C), the heating circuit is switched off. Thesame applies to reduced-temperature mode as soonas the outdoor temperature exceeds the set heatinglimit.

The [Flow max] parameter determines themaximum flow temperature for the heating circuit,

to protect it from overheating. The factory setting is 45°C for underfloor heating, and 65 °C for radiators.

55


When should the heating curve be adjusted?

If the rooms are not warming up, you should check thefollowing points first before changing the heating curvein the control system. Cold rooms are often not onlycaused by an incorrectly set graph.

Rooms with radiator thermostats or roomthermostats

• Check the current setting of the radiator thermostator the room thermostat. If a room is not warm, openthe thermostat fully or increase the temperaturesetting on the thermostat.

Fig. 7-61: Radiator thermostat and room thermostat

If the room is still not warm in heating mode (withinthe preset heating times), the temperature slider inthe control system must be set higher (see chapter7.6.1 "Operating elements") or the heating curveneeds to be adjusted (see 7.6.1 "Operatingelements").

If the room is too warm in heating mode,leave the radiator thermostat and room

controller open, and instead lower the temperatureslide in the control system or the heating curve.If the rooms are too warm or cold in reducedoperation mode (outside the heating times), onlythe [Set-back difference] parameter needs to beadjusted. See chapter Fig. 7-65: "Adjust reducedoperation mode".

• Check the adjusted heating limits in the controlsystem, see chapter 7.6.3.2 "Setting the heatinglimits". Heating limits that are set too high or toolow can be the reason for rooms being too cold ortoo warm.

Check operating mode and target roomtemperature on the ETA room sensor

• If a room is too cold, check the room sensor, or inthe control system set the operating mode and thedesired room temperature. It is possible that theheating circuit has been switched off or the roomtemperature is set too low.

Fig. 7-62: ETA room sensor

• Check the settings of the following parameters inthe text menu of the heating circuits:

–[Room effect], see chapter 7.6.4 "Text menu -Adjustable parameters"

–[Switch-on diff. room] and [Switch-off diff.room] see chapter 7.6.4 "Text menu -Adjustable parameters"

• If during heating mode the rooms are constantlytoo cold (within the set heating times), the heatingcurve must be adjusted. See chapter Fig. 7-63:"Adjust heating curve (at outdoor temperaturesabove freezing)".If the rooms are too cold in reduced-temperaturemode (outside the heating times), only the [Set-back difference] parameter needs to be adjusted.See chapter Fig. 7-65: "Adjust reduced operationmode".

Check the heating time settings

• Check the heating time settings in the controlsystem, see chapter 7.6.2 "Setting the heating timeslots".For heating systems with buffer storage, oftenheating times that are too short are the reason forinsufficiently warm rooms. Short heating times(less than 5 hours continuous heating) are particu-larly ill-advised for underfloor heating becausesuch systems react very slowly.

Optimal operation is enabled with low feed tem-peratures (=[Flow at +10 °C] and [Flow at -10 °C])for the heating curve and long continuous heatingtimes (10-14 hours). Thus, the heat is transferredevenly throughout the room. Therefore, it isadvisable (in heating systems with a buffer) to firstset a longer heating time and wait a few days. If therooms are then still too cold, the heating curvemust be adjusted. See chapter 7.6.1 "Operatingelements".

56 www.eta.co.at


If no buffer storage tank is available,several short heating times must be set with

pauses in between. This increases the heatabsorbed by the heating circuit from the boiler inthe short heating times. Through this heating timeinterruption, the screed becomes a "buffer" in caseof underfloor heating. Between the heating times,the screed cools and then absorbs heat again. In awell-insulated building, observe the followingguidelines:

–Radiator heating: several intervals with3 hours of heating and 2 hours break

–Underfloor heating: several intervals with4 hours of heating and 3 hours break

The optimum settings depend on the heat demandof the building and each room. Explore this in con-sultation with your heating contractor or ETAcustomer service.

7.6.3.1 Adjusting the heating curve

Adjusting the heating curve

The heating curve is adjusted through the settings ofthe heating circuit ( button) in the heating curvemenu ( button). How the heating curve is altereddepends on whether the rooms are always too warm ortoo cold at outdoor temperatures above freezing orbelow freezing.

Make adjustments to the heating curve in smallincrements only. For underfloor heating, never

change more than 2 °C at once, and for radiators nevermore than 4 °C. You may need to adapt the heatingcurve again after a couple of days, but if you, do it insmall increments, it is more precise and energyefficient.

At outdoor temperatures above freezing, therooms are always too hot or too cold:

1. Only parameter [Flow at +10 °C] is adjusted.

2. Change the selector switch to the heating modeposition ( ). Use the arrow keys toreduce parameter [Flow at +10 °C] if it is too warm,or increase if it is too cold.

Fig. 7-63: Adjust heating curve (at outdoor temperatures above freezing)

57


At outdoor temperatures below freezing, therooms are always too hot or too cold:

1. Only parameter [Flow at -10 °C] is adjusted.

2. Change the selector switch to the heating modeposition ( ). Use the arrow keys toreduce parameter [Flow at -10 °C] if it is too warm,or increase if it is too cold.

Fig. 7-64: Adjust heating curve (at outdoor temperatures below freezing)

Outside the heating times, the rooms are alwaystoo hot or too cold:

1. Then only the reduction is adjusted with parameter[Set-back difference].

2. Change the selector switch to the reducedoperation mode position ( ). Use thearrow keys to reduce parameter [Set-backdifference] if it is too cold, or increase if it is toowarm.

Fig. 7-65: Adjust reduced operation mode

With underfloor heating, reduced operation mode isonly partially noticeable because this heating systemreacts very slowly due to the high thermal mass of thescreed. Changes in parameters [Set-back difference]are therefore often not noticeable.

7.6.3.2 Setting the heating limits

Specifying the heating limits for the heating circuit

For each heating circuit, separate heating limits areadjustable for heating mode (within the set heatingtimes) and reduced operation mode (outside the setheating times).

If the current outside temperature exceeds theconfigured heating temperature (for example 18 °C),the heating circuit is switched off. The same applies toreduced-temperature mode as soon as the outdoortemperature exceeds the set heating limit.

If the outside temperature falls below the setheating limit (for example: 18 °C), a hysteresis of

2 °C will be observed in order to avoid cycling theheating circuit. Accordingly, the heating circuit willswitch on only once the outside temperature fallsbelow 16 °C (=18 °C - 2 °C).

The heating limits are adjusted through the settings ofthe heating circuit ( button) in the heating curvemenu ( button).

Setting heating limits for heating mode

1. Change the selector switch to the heating modeposition ( ).

Use the arrow keys to reduce parameter [Heatingthreshold], so that the heating circuit in heatingmode switches off at a lower outside temperature,or increase the value.

Fig. 7-66: Heating threshold for heating mode

58 www.eta.co.at


Setting heating limits for the reduced operationmode

1. Change the selector switch to the reducedoperation mode position ( ).

Use the arrow keys to reduce parameter [Heatingthreshold], so that the heating circuit in reducedoperation mode switches off at a lower outsidetemperature, or increase the value.

At settings below 0 °C, there is a risk offreezing.

Fig. 7-67: Heating limit for reduced-temperature mode




Explanation of [Room effect]

Optional: only for room sensor

The flow temperature is calculated on the basis of theheating curve and the outside temperature. If the roomtemperature falls by 1°C, the target flow temperature isincreased by this set value. If the room temperaturerises by 1°C, the target flow temperature is decreasedby the set value.

For underfloor and wall heating with a designtemperature of 30 °C, set the room influence to 1

°C; with a design temperature of 40 °C, set it to 2 °C.

Explanation of [Switch-on diff. room] and [Switch-off diff. room]

Optional: only for room sensor

These parameters specify the allowed deviation of theset room temperature for switching the heating circuiton and off.

Example: Room temperature setting = 21 °C[Switch-on diff. room] = 0.5 °C[Switch-off diff. room] = 2 °C=> The heating circuit will be switched off as soon asthe room temperature reaches 23 °C (=21 + 2 °C). Ifthe room temperature falls to 21.5 °C (=21+0.5 °C),heat is supplied to the heating circuit again.

Heating circuit

Room

Room effect

Switch-on diff. room

Switch-off diff. room

59

[Solar] function block ETAtouch controller

7.7 [Solar] function block

Overview of the solar heating system


button.

2 Collector temperature

3 Solar heating system consumer.Currently, the hot water storage tank is loaded fromthe solar heating system with a flow temperature of74 °C. The second buffer consumer is not currentlycharged.

The solar heating system control principle

The ETA control principle for solar heating systems isdefined so that an adjustable temperature differencebetween the panel and the tank (or the upper andlower buffer area in a buffer with 2 internal coils) iscomplied with. This is done by adjusting the speed ofthe solar pump.

Manual switching between "High Flow" (high speed ata lower collector temperature) and "Low Flow" (lowspeed at a higher collector temperature) is notnecessary, because this is automatically controlled.

The ETAtouch control system is compatible with agreat many versions, for enabling the integration of asolar heating system. The various versions aredescribed below.

7.7.1 Solar heating system with one tank

Solar heating system with only one tank

The solar heating system is controlled by switching thecollector pump on and off. This is switched on as soonas the collector has exceeded the minimumtemperature [Collector min] and is warmer by thedifference [Switch-on diff.] (factory setting 7 °C) thanthe tank being charged.

Fig. 7-68: Solar heating system connected to buffer

The speed of the collector pump is controlled insuch a way that the collector supplies a

temperature that is higher than the current tanktemperature by the configurable offset [Target collectordiff.].

When the tank has reached its maximum temperature(the factory setting of the buffer is 90 °C, and the hotwater tank 60 °C), or if the collector is only warmer bythe offset [Switch-off diff.] (factory setting 5 °C) thanthe tank, the collector pump is switched off.

Example:Buffer temperature [Buffer bottom Solar]: 45 °C[Target collector diff.]: 10 °C[Switch-off diff.]: 5 °C=> The speed of the solar pump is adjusted, so that thetemperature on the collector reaches 55 °C. With theincrease in buffer temperature, the collectortemperature also increases, because the 10°difference is adhered to.

If the collector temperature cannot be increased(because the sun provides too little heat), the collectorpump switches off when there is only a 5 °C differencebetween the collector and the buffer. Otherwise, thebuffer is charged to the maximum temperature of 90°C.

60 www.eta.co.at

ETAtouch controller [Solar] function block

7.7.2 Solar heating system with 2 tanks

Switching between several tanks

If the solar heating system charges several tanks (forexample, buffer and hot water tanks) it will switchbetween tanks on the basis of the currently setpriorities. The tank with the highest priority is chargedfirst.

Fig. 7-69: Solar heating system for the buffer and hot water tank

If the solar power is not sufficient for charging the tankwith the highest priority (collector is only warmer by thedifference [Switch-off diff.] than the tank that currentlyrequires charging), the tank with the next highestpriority is charged after the minimum time has elapsed(factory setting 20 minutes).

If the solar power increases once more, after theminimum time has elapsed solar charging switchesback to the tank with the higher priority. This ensuresthat the tank with the highest priority is always chargedfirst.

Uniform charging of tanks without considerationof individual priorities is also possible. The

[Service] permission is required for this. Then you canuse the [Changeover if diff. >] parameter in the solarheating system text menu to configure the temperaturedifference between the tanks.

7.7.3 Solar heating system for buffer with 2 internal coils

Switching between two internal coils

When switching between two internal coils, charging isdefined in two different areas of the buffer. Thepurpose is to produce a sufficiently high temperature inthe top part of the buffer, so that the boiler does nothave to start for hot water charging.

Fig. 7-70: Solar heating system with switching between two coils at the buffer

The solar pump starts as soon as the panel is warmerthan the current temperature in the upper buffer area.

Depending on whether the "Buffer" or "Buffer-Flex" function block was installed, the switching

differs between the two coils.

For "Buffer" function block: An internal target temperature [Buffer target solar] isprovided to control the switching. The targettemperature is determined by referencing current re-quirements or minimum temperatures and can beviewed in the buffer's text menu under:

Tab. 7-1: "Buffer" function block

The conditions for solar charging into the upper buffercoil are:

• The buffer is not currently being charged from theboiler.

• The outside temperature is above the set minimumtemperature of 10 °C ([Min. out. temp. Solar prio.]).

• The temperature in the upper buffer area is lowerthan the target temperature [Buffer target solar].

Buffer

Buffer top Solar

Buffer target solar

61


If all conditions are met and the collector is sufficientlywarm, the upper buffer area will be charged until thetarget temperature [Buffer target solar] is exceeded.Subsequently, solar charging is switched to the lowercoil in order to charge this buffer area.

If one of the described conditions is not met (forexample, if the buffer is currently being charged

by the boiler), there is no reason to feed the solarcharge to the upper buffer coil. Therefore, the solarcharge is directed into the lower coil in order to chargethis area. If all conditions are once again met, chargingis switched to the upper coil.

The only exception to this is when solar powerincreases while charging the lower buffer coil.

Then, once the minimum time (factory setting 20 min.)passes, charging will switch to the upper coil, althoughthe conditions are not met.

For "BufferFlex" function block: Here too, there is a separate target temperature forcontrolling the switching [Buffer target solar]. This isvisible under:

Tab. 7-2: "BufferFlex" function block

The options for stratified charging of the buffer by thesolar heating system have been simplified for the"PufferFlex". You can find the different settings in the"BufferFlex" text menu under parameter [Solar storagestrategy]. The settings are described below.

Explanation of [Solar storage strategy]

Various settings can be made for stratified charging ofthe buffer by the solar heating system.

• [Charging by demand]: The current demands of the consumers on thebuffer and the set minimum temperature of thesolar heating system ([Buffer top min. solar]) areused to calculate the temperature required forbuffer charging. The solar heating system will onlybegin to charge the buffer once the collectortemperature is greater than the calculatedtemperature (for charging the buffer).

• [Optimise yield]: The solar heating system will begin to charge thebuffer as soon as the collector temperature isgreater than the current buffer temperature.

• [Charging according to buffer top min. solar]: The solar heating system only begins to charge thebuffer once the collector temperature is greaterthan the set minimum temperature of the solarheating system ([Buffer top min. solar]).

Buffer

Solar producer

Buffer target solar

Buffer

Solar producer

Solar storage strategy

62 www.eta.co.at


7.7.4 Solar heating system with external heat exchanger

Solar heating system with external heat exchanger

The control principle is the same as in a solar heatingsystem with just one tank, see chapter 7.7.1 "Solarheating system with one tank".The speed of the collector pump also controls theadjustable temperature difference [Target collectordiff.] between the collector and the tank.

Fig. 7-71: Solar heating system with external heat exchanger connected to buffer

In addition, a variable speed secondary pump isavailable for the heat exchanger. Through speed

adjustment, it attempts to adapt the temperaturedifference between collector and secondary flow (seechart 78 °C - 74°C = 4 °C) to the temperaturedifference between the return of the solar heatingsystem and the tank (49 °C - 45 °C = 4 °C).

Fig. 7-72: Regulation principle

In solar heating systems with external heatexchangers, experience has shown that most of theenergy from the solar heating system goes to the tankin this control principle.

63


7.7.5 Solar heating system with external heat exchanger and stratified charging valve

Solar heating system with external heat exchangerand stratified charging valve

This variation of solar heating system also aims toproduce a sufficiently high temperature in the upperarea of the buffer, so the boiler does not have to startfor hot water charging.

Fig. 7-73: Solar heating system with external heat exchanger and stratified charging valve

The collector pump starts as soon as the collector iswarmer than the target temperature in the upper bufferarea [Buffer target solar].

The control principle is identical to that of a buffer withtwo internal coils. The conditions for solar charging intothe upper buffer coil are also the same. A descriptioncan be found in chapter 7.7.3 "Solar heating system forbuffer with 2 internal coils".The speed control of the secondary pump is identicalto that of a solar heating system with an external heatexchanger, see graphic Fig. 7-72: "Regulationprinciple".

The only difference is the switching of solarcharging from the lower buffer coil to the upper. If

the conditions for solar charging into the upper coil arenot met, the lower coil will be charged first. If thesecondary feed temperature rises enough that thetemperature in the upper buffer area [Buffer top Solar]is exceeded, solar charging is immediately switched tothe upper coil. No minimum time for solar charging istaken into consideration. As soon as the secondaryfeed temperature drops below the [Buffer top Solar]temperature, the lower coil is charged again.

The secondary feed temperature rises when thecollector temperature increases or the speed of

the secondary pump decreases.




Explanation of [Collector min]

This parameter sets the minimum temperature forstarting the solar pump. The solar pump can only bestarted once the solar panel has exceeded this tem-perature.

Do not set this temperature too high, to ensurethat it is possible for heat to supplied to pre-heat

the tank even when there is little sunlight. The optimalrange is between 30 °C and 50 °C.

Explanation of [Target collector diff.]

This parameter sets the desired temperaturedifference between the solar panel and the connectedtank (buffer or hot water tank). This temperaturedifference is controlled by adjusting the speed of thesolar pump.

If the buffer is being charged by the solar heatingsystem, the temperature of the solar panel

[Collector] is compared with the buffer temperature[Buffer bottom Solar]. If the hot water tank is beingcharged, the [Hot water tank bottom] temperature iscompared.

A high temperature difference results in a lowspeed of the solar pump. This way, a smaller

quantity of water is conveyed through the solar panel.The water remains in the solar panel for a longer time,and therefore produces a higher working temperaturein the panel. Consequently, a higher hot watertemperature is achieved, but there are also morelosses from the solar panel.

A low temperature difference results in a highspeed of the solar pump. A larger quantity of

water is therefore conveyed through the solar panel.The water remains in the solar panel for a short time,and so also becomes less hot. The workingtemperature of the solar panel is therefore lower, butthere are fewer losses via the solar panel.

State

Collector

Collector min

Collector pump

Target collector diff.

64 www.eta.co.at


65

[Aux.boiler] function block ETAtouch controller

7.8 [Aux.boiler] function block

Boiler overview


button.

2 Boiler temperature

3 Boiler consumers.Currently, the consumer is charged by the burnerat a flow temperature of 64 °C.

4 Enabling or locking the boiler. = burner is enabled = burner is locked

5 [Settings] button.In this menu, the standby time of the burner can beadjusted.

Enabling or locking the boiler

This allows the burner for the ETAcontrol system to be enabled or

disabled. If the burner is enabled ( setting),the ETA control system can activate it when needed,but only within the configured times of operation. In the

setting, the auxiliary boiler is locked and theETA control system cannot put the burner intooperation.

Various tasks of the auxiliary boiler

An additional burner (oil or gas) in the heating systemserves either to cover peak loads in the heatingsystem, or as fail-safe for the main heat producer (forexample: boiler or another buffer).

Auxiliary boiler to cover peak loads:

• This auxiliary boiler has a separate charging pumpand can supply the consumer (e.g. buffer) withheat at the same time as the main heat producer(e.g. boiler).

In heating systems with a buffer, the burner is onlyput into operation if the buffer requests a capacitythat is higher than that of the ETA heating boiler.For heating systems without a buffer, the burner isonly put into operation when the ETA heating boilerdoes not reach the required output.

The burner charge pump is started by the ETAcontrol system if the burner temperature is higherthan the enabling temperature of the chargingpump [Enable AuxBoilChargePump]. In addition,the auxiliary boiler temperature must be greaterthan the temperature of the consumer to becharged by at least the configured [Thermostatdiff.] difference.

Aux. boiler as fail-safe for the main heat producer:

• Through the changeover valve between main heatproducer and aux. boiler, the consumers aresupplied either by the main heat producer or theaux. boiler. If the main heat producer is switchedoff or a malfunction is present, the changeovervalve changes to the aux. boiler to meet the heatrequirements of the consumer.

Switching from one heat producer to another onlyhappens when the temperature of the auxiliaryboiler exceeds the configured enablingtemperature [Enable diverter valve] of thechangeover valve. Only then does the changeovervalve route the heat from the hotter heat producerto the consumers.

66 www.eta.co.at

ETAtouch controller [Aux.boiler] function block

7.8.1 Setting the charging times

Open the overview screen of the standby timesettings

The standby times of the burner can be adjusted in thesettings ( button). To adjust, open the settings andthen open the standby times of any given day with the

[Stand-by times Daily plan] button. An overviewscreen opens.

Fig. 7-74: Overview

1 Set time windows (standby times)












Explanation of [Start lag]

This parameter is used to set the duration of a delay inthe operation of the auxiliary boiler after the ETAcontrol system has demanded it.

If there is still a demand by the ETA control systemafter this period ends, then the auxiliary boiler willbegin operation.

Aux.boiler

Settings

Start lag

67

Regular cleaning

8 Regular cleaning

End heating mode, perform ember burnout

During the last heating mode, press the [Emberburnout] button in the boiler overview (the button isthen displayed in yellow ). Ember retention is thendeactivated and the boiler performs a complete emberburnout (duration approx. 1 hour). The majority of thecharcoal burns in the fuel chamber.

Only start the maintenance when the boiler hascooled down sufficiently.

Checking the heating system's water pressure

In buildings with up to three storeys, the optimumwater pressure in a cold heating system is between 1and 2 bar. For a warm heating system, the optimumwater pressure is between 1.5 and 2.5 bar.

Fig. 8-1: Pressure gauge

If the water pressure is too low, fill the coldheating system to approx. 2 bar. Do not fill to a

higher pressure, because water expands as thetemperature rises and the water pressure also rises inheating mode. The safety valve triggers at approx. 2.8bar.

If the water pressure drops several times a year,contact a heating professional. When refilling

water in the heating system, the same water as usedduring initial filling should be used whenever possible(e.g. treated water).

Actuate cleaning lever

Close the insulation door and clean the heatexchanger by repeated movement (10 x) of thecleaning lever on the side.

Fig. 8-2: Cleaning lever

This step is omitted if the optional automatic heatexchanger cleaner is mounted on the boiler.

De-ash boiler

The ash in the fuel chamber is needed asinsulation for ember retention. Therefore, leave a

layer of ash approximately 3 cm thick in the fuelchamber. Only rake the excess ash in the primarycombustion chamber. Some pieces of charcoal willdrop into the primary combustion chamber during thisprocess; these are best left there. The charcoal willburn during the next combustion cycle and the ash willprotect the bottom of the combustion chamber againstpremature wear.

Fig. 8-3: Rake the excess ash and pieces of charcoal into the primary combustion chamber.

68 www.eta.co.at

Regular cleaning

Check the openings for the primary air in thesuspension plates, and also the burn-through open-ings in the grate. These openings must be free; if not,clear them with the poker.

Fig. 8-4: Openings for primary air and burn-through openings

Pull most of the ash out of the primary combustionchamber into the ash box with the poker. Leave about1 cm of ash in the primary combustion chamber. Thisserves as insulation and protection.

Fig. 8-5: Removing ash from the combustion chamber

Pull the ash from the ash collection duct (under theprimary combustion chamber) into the ash box. Alsoclear the rear end of the ash collection duct, so there'sno ash in front of the lambda probe head.

Fig. 8-6: Removing ash from the ash collection duct

The draught fan runs during de-ashing. Pull the ashslowly and steadily out of the boiler so that not toomuch ash is stirred up and blown into the open airthrough the chimney.

If there are still embers in the ash, leave the ashin a closed, non-combustible container for at least

2 days. Only put the ash into the waste bin when youare sure that no more embers are present.

Do not push the ash box into the primarycombustion chamber. For the 40 - 60 kW boiler

this is possible, but the ash box is not designed for itand is destroyed by the high temperatures.

Checking the ash collection duct walls

Check the walls of the ash collection duct, they may bewhite to brown. If they are black with soot, either toomuch wood was burned at too low a heat consumption,the fire was not lit correctly at start-up or, in rare cases,the lambda probe gave incorrect measurement values.

Fig. 8-7: Checking the ash collection duct walls

69

Information about measurement Emission measurement

9 Emission measurement

9.1 Information about measurement

9.1.1 Introduction

If possible, perform emissions measurements inwinter only

It is preferable to measure emissions in winter so thatheat consumption to the heating system is ensuredduring the emissions measurement.

In spring and fall, the consumers in the heatingsystem usually need less heat. If emissions are

measured during this time, excess heat cannot besafely removed from the heating system. As a remedy,temporarily switch the heating circuits to continuous"Day" operation. Also temporarily raise the target roomtemperature by a few degrees so that the heatingcircuits switch on safely. After measuring emissions,switch back to the original operating mode and roomtemperature.

Timely cleaning of the boiler for emissionsmeasurement

The customer will be notified of the date of emissionsmeasurement. Thoroughly clean the boiler and flueduct 3 to 5 days before measuring emissions. Refer tothe documents included with the boiler (maintenanceinstructions, operating instructions) for the necessarysteps. Once this is complete, heating can resume asusual. If you wait to clean until just before the emissions mea-surement, large amounts of flue ash will be present inthe flue gas, resulting in false measurement results.

Regular cleaning and maintenance of the boiler isessential for having low emissions and therefore goodmeasurement results. You can perform cleaning byyourself but we recommend contracting a technicalexpert for maintenance. Then the heating system willbe well prepared for the emissions measurement.

Required heat-up time and residual oxygen level

Emissions may be measured only once the boiler hasreached the necessary operating temperature (notonly the feed temperature). Therefore, once switchedon, the cooled boiler must run for a certain amount oftime (heat-up time) in order to reach the required

operating temperature. These times are indicated inthe following table. Measuring during this heat-up timeis thus prohibited.

Tab. 9-1: required heat-up time

Once the boiler has reached the operating tempera-ture, the residual oxygen level must be between 4%and 8%. This is indicated in the boiler's text menuunder:

Tab. 9-2: Current residual oxygen content

If the boiler is at operating temperature and theresidual oxygen level is above 8%, then leak air

is probably getting into the boiler through improperlysealed boiler doors, the maintenance cover, orLambda probe. The cause must be eliminated.

9.1.2 Flue pipe

Provide a short, ascending flue pipe to thechimney

The flue pipe from the boiler to the chimney must beshort, leakproof and ascending. "Attractive" right-angleflue offsets with two or more bends are bad in a fluepipe. The optimum to strive for is the shortest pipe fromthe boiler to the chimney with a minimum of directionchanges.

Boiler Heat-up time (hours)

eHACK 20-80

ePE-K 60-801:30 h

eHACK 100-240

ePE-K 100-2402:00 h

HACK 20-90

PE-K 32-901:15 hrs

HACK 110-130

PE-K 105-1401:40 hrs

HACK 200

PE-K 180-2202:00 h

Log boiler 1:30 h

TWIN pellet burner 1:35 h

PelletsUnit

PelletsCompact 20-320:45 h

PelletsCompact 33-50 1:00 h

PelletsCompact 60-105 1:15 h

Boiler

Residual O2

70 www.eta.co.at

Emission measurement Information about measurement

The flue pipe to the chimney must be leakproof. Forunsealed sleeve pipes, use heat-resistant silicone as asealant. Otherwise, you can expect smoke to escapeinto the boiler room as the boiler heats up. Ensure theflue pipe always ascends to the chimney

Long horizontal flue pipes to the chimney must have anarrow diameter and above-average insulation (>50mm). Provide enough cleaning apertures in the fluepipe. A flue pipe to the chimney with a large diameterwould reduce the necessary calculated chimneydiameter. However, with low flow speeds ash depositswill form, and the theoretically calculated flue draughtwill be lost again.

If the chimney has a large diameter, the straight lengthof the connecting pipe can be at maximum half of theeffective chimney height (calculation required).

Insulate the connecting pipe to the chimney

The connection between the boiler and the chimneyshould be insulated with at least 30 mm, preferably 50mm, of mineral wool to avoid thermal losses, whichcan lead to a build-up of condensation.

Creating a measurement opening in the flue pipe

Create the measurement opening in the verticalportion of the flue pipe. A straight section of a suitablelength must be present before and after themeasurement opening because otherwise turbulenceat the measurement points will prevent accurate mea-surements. The distance from the boiler's flue ductconnection or from a pipe bend must be at least twicethe diameter of the flue duct.

Fig. 9-1: Distances for measurement opening

Cleaning aperture in the connecting pipe

Easily accessible cleaning apertures must be availablefor cleaning the flue pipe.

Fig. 9-2: Cleaning aperture

9.1.3 Adjustable parameters

Setting the duration of the emission measurement

The duration of the emission measurement isfactory-set to 45 minutes. If necessary, this can

be increased with the [Service] access level. To do so,switch to the text menu of the boiler. You can adjust theduration as follows:

Boiler

Flue gas

Emission measure

MeasDuration

71

Perform emissions measurement Emission measurement

9.2 Perform emissions measurement

Clean the boiler 3 to 5 days before measuringemissions.

Thoroughly clean the boiler and flue pipe 3 to 5 daysbefore the emissions measurement. Once this iscomplete, resume heating as usual.

This delay between cleaning and measurementis necessary in order to allow dust disturbed

during cleaning to settle again. If the chimney sweepmeasures unsettled dust, the dust reading will behigher than normal and thus inaccurate.

CAUTION!

Under no circumstances clean the boiler and fluepipe on the day of the measurement!

Buffer and boiler must be cold

Before the start of the emission measurement, thebuffer and the boiler must have cooled down to ensureheat consumption in the heating system during theemission measurement. Preferably, the boiler shouldnot be used the night before the emission measure-ment.

Ensure sufficient heat consumption

Open all radiator valves and turn all radiator and roomthermostats to the maximum.

Switch the heating circuits to continuous "Day"operation and increase the room target

temperature at the room sensor or in the controller sothe heating circuits will continue to consume heat evenduring the transitional period. After measuringemissions, switch back to the original operating modeand room temperature.

Use half-metre split logs

Use half-metre split logs for emissions measurement.The best choice is hardwood with as little bark aspossible, such as beech. Place the logs as closetogether as possible in the fuel chamber to fill it ascompletely as possible. However, make sure the burn-through openings in the grate are not obstructed.

Preparing and performing the emissionsmeasurement

1. In the log boiler overview, press the [Measure-ment] button in order to open the emissionsmeasurement settings window.

Fig. 9-3: Settings window for emissions measurement

2. By pressing the [Start now] button, the logboiler will immediately begin preparations formeasurement after heating up.

Use the [Begin measurement] button to enterthe date agreed for sweeping the chimney. Oncethe date has been entered, it will appear in theboiler overview.

Fig. 9-4: Set date

In addition, the locking time of the log boiler can beadjusted ( [Lock duration] button). This is basedon the selected measurement time. During thisperiod, a warning notice will appear that no heatingoperation should be started, so that the heatingsystem has time to cool down.Example: If a time of 5:00 pm is set for emissionsmeasurement and a cool-down time of [Lockduration] 8 h, the warning notice will appearstarting at 9:00 am .

Set the locking time so that the warningnotice will appear already in the morning on

the day of measurement.

3. The log boiler must be heated up with enough timebefore the emissions measurement in order toreach the required operating temperature. Refer toTable Tab. 9-1: "required heat-up time" for therequired heat-up time.

72 www.eta.co.at

Emission measurement Perform emissions measurement

4. When the log boiler is ready for emissions mea-surement, a message on the screen will indicatethis. The boiler is now operated at full load (orpartial load respectively) and the outputadjustment is blocked while doing so. Therefore,the boiler output is not reduced. The controlsystem also ensures that heat is dissipated into theheating system on a mandatory basis, if this ispossible.

Perform the emissions measurement now.

The doors on the log boiler may not beopened during the emissions measurement.

Also, do not stoke the fire in the log boiler.

5. Switch the boiler back to normal mode after theemissions measurement. To do this, press the[Deactivate measurement] button in thesettings window. If you do not press this button, theboiler will automatically switch back to normalmode after some time.

73

Heating value

10 Heating value

Split wood will dry out in just one summer

The moisture content of split logs intended for a logboiler should be below 20% (air dry).

Damp wood with a moisture content of above 20%creates a moist climate in the fuel chamber. Wood thatis not sufficiently dry can cause the boiler's fuelchamber to rust through.

One summer is sufficient to dry out split firewood

Unsplit logs stacked as metre-long pieces in the forestwill generally take two summers to dry.

However, it can be done faster. If the timber is felled inwinter (before the end of January) and split immediate-ly, a moisture content of 15% can be reached bySeptember through air-drying. Split logs also burn farbetter than unsplit logs.

Unsplit logs take two months longer, and thus asecond summer, to dry.

The best approach is to split the wood in lengths of 1m immediately after felling: split in half for a logdiameter of up to 15 cm, into quarters for a diameter upto 20 cm, into sixths for a diameter up to 25 cm, andinto eighths for a diameter up to 30 cm.

Store the split wood in a windy place on a dry surface;ideally stack crosswise on two logs or concrete pipesand cover only the top. Of course a sunny location is

preferable, but it is more important to find a dry, windyplace. Leave a gap between stacks as well. If youstack wood along the wall of a house, leave an air gapof at least 10 cm between the wall and the stack ofwood.

Wood stored outside in winter will absorb moisturefrom precipitation. For this reason either move thewood to a covered location in September or at leasttemporarily store it in a warm room for a week beforeburning.

During storage the heating value is reduced byprocesses similar to decay; depending on how drystorage conditions are, the loss can be between 1%and 3% per year. For this reason, only store firewoodfor longer than 3 years in exceptional circumstances.

Split the wood and store it in a dry, windy place,one percent moisture more or less will not make abig difference

To sum up: the heating value changes by only 2%between 20% and 10% moisture content. It is

easy to achieve less than 20% – even if you cut thewood in summer – if you split the wood and store itoutdoors with protection against the rain for a year.

Fig. 10-1: Source: "Rationelle Scheitholzbereitsstellungsver-fahren" (economical methods for preparing split logs), Report

11, TFZ Straubing, with heating values added by ETA.

Heating value of wood

Split wood is typically sold in stacks by the stere. Theenergy content does not only depend on the kind ofwood. The amount of heat contained in a stere also

74 www.eta.co.at

Heating value

depends on whether the wood is unsplit round logs,metre-long split logs, or ready-to-burn split logs, andon whether it is fresh from the forest or dried forfirewood.

The wood volume stays constant from when it isfreshly cut with a moisture content of 60% to the fibresaturation point at 25%. The wood starts to contract ifdried below this point. It shrinks, and this is why air-dried wood (moisture content of 15%) has more woodsubstance per stere than freshly cut wood. Thedifference is typically 5% to 6% for softwood, and 6%to 9% for hardwood.

Logs are not straight. The longer the logs are, the lesswood and the more air is present per stere. There istypically more air in "crooked" hardwood than in"straight" softwood.

There is one further difference: round logs can typicallybe stacked in a far more compact way than metre-longsplit logs. If you split the wood yourself, buying roundlogs will give you up to 15% more wood per stere.

In practice, deviations on the order of +/-10%compared with theoretical values are to be expected.Up to 20% is possible in extreme cases, not onlybecause the wood is particularly straight or crookedbut also because the density of the wood mass itselfcan vary.

Incidentally, if you order a stere of ready-to-burn beechfirewood as 50 cm split logs from your wood dealer, thedealer is entitled under current law to supply 0.85 m³ ofhalf-metre split logs cut from 1 m³ of metre-length splitlogs. To avoid any unpleasant surprises, whenordering ask how your dealer measures a stere (if theprice is good, you may find 0.85 m³ acceptable).

Estimating your wood requirements

Each kilowatt of heat output requires 0.9 steres of half-metre split beech logs, or 1.3 steres of split spruce peryear.

In other words, 8 steres of half-metre split spruce logsor 5.5 steres of beech will replace 1000 litres ofheating oil.

Energy content of one stere of wood in kilowatt hours

Round logs

fresh-cut 1 m

Round logsdry1 m

Split logs

fresh-cut 1 m

Split logsdry1 m

Split logs

fresh-cut50 cm

Split logsdry

50 cm

Split logs

fresh-cut33 cm

Split logsdry

33 cm

Moisture content 30-60% 15% 30-60% 15% 30-60% 15% 30-60% 15%

Softwood1 stere contains 0.65 m³

1 stere contains 0.56 m³



Fir 1205 1269 1038 1093 1149 1210 1186 1249

Spruce 1299 1373 1119 1183 1239 1310 1279 1352

Douglas fir 1402 1478 1208 1274 1337 1410 1380 1455

Pine 1542 1625 1329 1400 1471 1550 1519 1600

Larch 1573 1656 1355 1427 1501 1580 1549 1631

Hardwood1 stere contains 0.59 m³




Poplar 958 1020 812 864 958 1020 1007 1072

Willow 1107 1200 938 1017 1107 1200 1163 1261

Alder 1191 1270 1009 1076 1191 1270 1252 1335

Maple 1472 1550 1247 1314 1472 1550 1547 1629

Birch 1475 1570 1250 1331 1475 1570 1550 1650

Ash 1658 1760 1405 1492 1658 1760 1742 1849

Oak 1664 1760 1410 1492 1664 1760 1749 1849

Copper beech 1655 1800 1403 1525 1655 1800 1739 1892

Hornbeam 1743 1920 1477 1627 1743 1920 1832 2018

Black locust 1743 1920 1477 1627 1743 1920 1832 2018

75

Water hardness Heating water

11 Heating water

11.1 Water hardness

Determine permissible water hardness for theheating water according to ÖNORM H 5195-1

Instructions for determination:

1. Divide water content (litres) of the heat producer byits output in kW. If the result is larger than 0.3 l/kW,Table 1 applies. If the value is smaller or equal to0.3 l/kW, Table 2 applies.

2. Divide the total heating water volume (in litres) bythe output (in kW) of the smallest heat producer.The result is the specific water content and thisdetermines the column within the previouslycalculated table.

3. Read the data for the permissible water hardnessfrom the respective line using the total output of theheat producer.

Example: A heating system with a 45 kW boiler and1500 litre total water volume.

1. The ratio of water content to output is more than0.3 l/kW (117:45=2.6) => Table 1.

2. The specific water content is 33,3 l/kW (1500÷45 =33.3) => middle column in Table 1.

3. The total output of the boiler is 45 kW; therefore,only the data from the first line (≤ 50 kW) arerelevant.

The permissible water hardness in this example is 11.2°dH.

Softening with a salt-regeneration ion exchanger

We recommend softening water with salt-regenerationion exchangers, just as drinking water is softened. Thismethod does not remove salt from the water. Itreplaces the calcium in the lime with sodium from thesalt, and has considerable advantages. It is cheap and

chemically stable against contamination. In addition, itproduces a natural alkalinity that generally results in asufficiently non-corroding pH value of around 8.

pH value between 8 and 9 may require dosing withtrisodium phosphate

If the heating water's pH value has not itself changedto more than 8 after a week of operation, increase it byadding 10 g/m³ of trisodium phosphate (Na3PO4) or25 g/m³ of trisodium phosphate dodecahydrate (Na3-PO4.12H2O). Wait another 2-4 weeks before makingfurther corrections. The pH value must not exceed 9.

No hybrid installations

A disadvantage of salt-regeneration ion exchange isthe salt content with its high electrical conductivity,which can lead to electrolytic corrosion, especially ofaluminium or galvanized steel. If only steel, brass,gunmetal and copper are used in the heating systemand the use of stainless steel is limited to small areas,then no corrosion problems should be expected, evenwith salty water.

Galvanized and aluminium parts in a heating systemare always in danger of corrosion, especially incombination with copper tubing. In practice, thismeans no hot-galvanized fittings and no mixing ofgalvanized tubing with copper tubing. There is anillogical exception: galvanized steel tubing combinedwith boilers or buffer storage tanks made of steel.Presumably, the uniform zinc layer dissolves uniformlyand is dispersed evenly throughout the system withoutlocalised corrosion.

Table 1

Heat producer with large (> 0.3 l/kW) water content

Table 2

Heat producer with small (> 0.3 l/kW) water content

Specific water content in litre/kW < 20 l/kW≥ 20 /kW< 50 l/kW

≥ 50 l/kW < 20 l/kW≥ 20 l/kW< 50 l/kW

≥ 50 l/kW

Total output of the heatproducer

≤ 50 kW 16.8 °dH 11.2 °dH 5.6 °dH 11.2 °dH 5.6 °dH 0.6 °dH

> 50 kW≤ 200 kW

11.2 °dH 5.6 °dH 2.8 °dH 5.6 °dH 2.8 °dH 0.6 °dH

> 200 kW≤ 600 kW

5.6 °dH 2.8 °dH 0.6 °dH 2.8 °dH 0.6 °dH 0.6 °dH

> 600 kW 2.8 °dH 0.6 °dH 0.6 °dH 0.6 °dH 0.6 °dH 0.6 °dH

76 www.eta.co.at

Heating water Refilling

Complete desalination not required

If there is no aluminium (heat exchanger in the gasboiler or aluminium radiator) in the system, then costlycomplete desalination with ion exchange cartridges orosmosis is not required.

Lime stabilisation can be dangerous

The addition of lime stabilising agents preventslimescale. However, we advise against doing this.These agents increase the salt content and result in anundefined pH value. If the system is filled with largeamounts of water, exactly the same agent must beused again. Mixing with other water additives or withantifreeze can result in corrosion.

11.2 Refilling

Fill up heating water

If water refilling in the heating system is required, forexample to adjust the pressure, the same water asused during initial filling should be used whereverpossible.

If only a small amount of water is to be replenished(below 10% the system volume), then normal tapwater can be used. This applies, for example, whenreplacing a pump or mixer.

The heating system is never to be refilled withrainwater, as this is usually contaminated and the

pH value is too low.

77

www.eta.co.at

www.eta.co.at

www.eta.co.at/downloads

DOWNLOAD

Log boiler 20 - 60 kW Operation 2… · 2019-09-12 EN 0000000300 V.007 3.47.0 110, 218, 121P, 219P...

Documents

Transcript of Log boiler 20 - 60 kW Operation 2… · 2019-09-12 EN 0000000300 V.007 3.47.0 110, 218, 121P, 219P...