MICROGENUS IIWALL-HUNG ELECTRONIC IGNITION GAS COMBINATION BOILER

minimum spaceMAXIMUM COMFORT

The microGENUS II is the successor to one of theUK’s most popular combination boilers themicroGENUS. microGENUS II is even closer to yourneeds because it has been developed fromAriston’s extensive experience in providing comfortto millions of homes around the world. One ofEurope’s leading brands for over 40 years.The manufacturing process is certified to ISO9001 standard guaranteeing the best in quality.Manufactured on state-of-the-art production lineseach process is constantly tested, checked andsubjected to strict Quality Control to guarantee thelong-life and the absolute reliability of every boiler.For any further needs that may arise after a boiler’sinstallation, Ariston places the best in technicalsupport and customer service at your disposal,offering swift and highly qualified assistance.

STYLISH, COMPACT AND POWERFULjust 700 x 400 x 300 mm

microGENUS II - DEVELOPEDFROM OVER 40 YEARS OFARISTON QUALITY

with the option toextend up to 5

years

microGENUS II combines the most advancedheating and domestic hot water productiontechnologies in one compact unit, with tinydimensions, of just, 700 x 400 x 300 mm, it canbe installed almost anywhere.Reliable, quiet, durable, and hard working, thisboiler looks great and offers three differentoutputs to suit most needs - with D.H.W. flowrates up to 12.7 l/min at ∆T = 35°C. Thisbacked up by a comprehensive 2 year guaranteethat can be extended up to 5 years, makesmicroGENUS II unbeatable in performance andpeace of mind.

With the microGENUS II, Ariston hasincreased the level of quality andperformance that is normallyachieved traditionally by largerboilers. It is decidedly different fromothers on the market that often needto sacrifice quality or performance inorder to reduce dimensions.

THE CHARACTERISTICS OFLARGER BOILERS WITHOUTCOMPROMISES

microGENUS II - COMPACT,LIGHT AND EASY TO INSTALL

5 year guaranteeon D.H.W. plateheat exchanger

As a part of Ariston’scontinuous attention toinstaller requirements, thebest technical and designsolutions have beenemployed in themicroGENUS II, makinginstallation easier even inthe tightest of spaces. Itssmall size and low weightallows for easy handling bya single person. The fluesystem installation hasalso been simplified, savinginstallers valuable time,improving competitivenessand efficiency.

Also periodic servicing and checks are easierand quick, thanks to the combustion analysisdevice, easy access to all components andintegrated innovative system diagnostics.microGENUS II can be serviced and worked oneasily and has been designed to enableaccess to all components from the fronteliminating the need for side access. Outletsfor the analysis of combustion products andthe revolutionary new P.C.B. withmicroprocessor allows boiler functions to betested via the built-in digital display.microGENUS II knows “how to look afteritself”; the anti-frost device is activated whenthe temperature of the water in the heatingcircuit is low, whilst the anti-scale deviceprevents the excessive rising of thetemperature of domestic hot water. In the same way the anti-pump seizing deviceallows the boiler to be ready to function afterlong periods of inactivity.

microGENUS IIMAKES SERVICING EASY

microGENUS IIINSTALLERS BENEFITS:• Quick and easy installation• Integral digital diagnostic display• Light weight: lightest in its class• 3 outputs available• High D.H.W. flow rates • Combustion analysis device• All accessories available for original

microGENUS also available formicroGENUS II

• Easy to service and maintain: allcomponents accessible from the frontof boiler

• Simple to use control panel with hotwater and heating temperature displayas well as diagnostics

• Combustion analysis device• P.C.B. with microprocessor

incorporating auto diagnostics• Integral digital diagnostic display• D.H.W. stainless steel plate heat

exchanger guaranteed for 5 years• 2 year manufacturer’s guarantee

COMFORT FUNCTION ensures hot water in 5 secondsSwitching to Comfort produces hot water at outletsmuch faster than a traditional combination boiler. This is possible because when the Comfort functionis selected, the hot water is maintained at atemperature between 34°C and 40°C, allowinginstantaneous (<5 sec.) hot water supply.Also the electronic temperature control guaranteesthat the domestic hot water is always supplied at thedesired temperature, without detectable temperaturevariations. Time in Seconds

microGENUS II

0

°�C

Desired temperature40

5

TRADITIONALCOMBI

Wat

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empe

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USER-FRIENDLY AND INTERACTIVEwith the unique control panel andbuilt-in diagnostics

FUNCTIONALITY WITH EASE OF USEAll the functions needed by the user, are simple toprogram and can be found on one unique easy to usecontrol panel. Temperature adjustment knobs allow forsubtle adjustments of hot water or central heating. Aneconomy/comfort switch allows you to immediately selectinstant hot water at any outlet. The digital displayindicates the boiler’s operating status and shows thetemperature of heating and hot water. In the unlikelyevent of a fault an error code will be displayedcorresponding with fault descriptions in the Installationand Servicing manual.

• Simple to use• Stylish design - looks good anywhere• High D.H.W. flow rates up to 12.7 l/min (2.8

gal/min) (31 kW - 105,800 Btu/h version)• Low volume, saving valuable space in the home• Copious amounts of hot water on demand• Comfort switch (pre-heat function) guaranteeing

hot water at outlets in less than 5 seconds

• Simple to use control panel with hot water andheating temperature display

• Built-in mechanical time clock• Enabled for the addition of chronological

thermostats or a digital time clock• Comprehensive 2 year guarantee• Guarantee extendable up to 5 years

microGENUS II USER BENEFITS :

WALL-HUNG GAS COMBINATION BOILERROOM SEALED COMBUSTION CHAMBER

MICROGENUS II 24 MFFI 28 MFFI 31 MFFI

MICROGENUS II 28 MFFI

MICROGENUS II 24 MFFI Ø 3/4” BSP

Ø 3/4” BSP

Ø 1/2” BSP

Ø 1/2” BSP

Ø 3/4” BSP

Ø 3/4” BSP

Ø 1/2” BSP

Ø 1/2” BSP

Ø 3/4” BSP

Ø 3/4” BSP

F1 60/100F2 80/80F1 60/100F2 80/80

ACentral heating flow

BDomestic hot water outlet

DDomestic hot water inlet

ECentral heating return

FFlue (Ø mm)

CGas inlet

CLEARANCE DIMENSIONS - PIPE FITTINGS - EXHAUST OUTLETS

Twin pipe exhaustCoaxial exhaust

Electronic IgnitionFully modulatingAutomaticBy-pass

P.C.B. with microprocessor

IPX4DAnti-frostdevice

12

3

40bar

Insufficient systempressure shutdown

Integralauto-diagnostics

D.H.W tempadjustment

Anti-scale device

D.H.W. plate heatexchanger

Combustionanalysis mode

High headpump

MICROGENUS II 31 MFFI F1 60/100F2 80/80Ø 3/4” BSP Ø 1/2” BSPØ 3/4” BSPØ 1/2” BSPØ 3/4” BSP

• Compact dimensions (300x400x700mm)

• Available in 3 outputs of 24.8 kW -84,600 Btu/h, 28.0 kW - 95,500 Btu/hor 31.0 kW - 105,800 Btu/h

• Fully modulating in C.H./D.H.W. withan accuracy to ± 1°C

• Auto-diagnostic system andintegrated control in P.C.B.

• Government Standard AssessmentProcedure (SAP) efficiency rating upto 80.3%

• Comfort switch (pre-heat function)guaranteeing hot water at the outletin less than 5 seconds

• High D.H.W. flow rates up to 12.7l/min (2.8 gal/min) (31kW - 105,800Btu/h version)

• Anti-frost device

• Anti-scale device• Anti seizing device for the pump• Built-in automatic by-pass• Built-in mechanical time clock• Coaxial flue system up to 4 m, twin

pipe flue system up to 30 m• Split exhaust and intake pipes for

built-in combustion analysis • Optional outdoor sensor: regulates

the heating temperature automatically• D.H.W. stainless steel plate heat

exchanger guaranteed for 5 years• 2 year manufacturer's guarantee• Guarantee extendable up to 5 years

C.H tempadjustment

Graph of boiler residual head

flow rate l/h100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400

100

200

300

400

500

600

1 - 24 kW model2 - 28 & 31 kW models

SCHEMATIC

TECHNICAL DATA

24 MFFI 28 MFFI 31 MFFI

Separation ofthe air intake

Simplified Coaxialsystem coupling

Access to airpressure switch

Category II 2H3+ II 2H3+ II 2H3+Type C* C* C*

POWERHeat input min. kW-Btu/h 12.2-41,600 13.3-45,400 15.5-52,900Heat input max. kW-Btu/h 29.4-100,300 33.1-112,900 37.2-126,900Heat output min. kW-Btu/h 9.7-33,000 10.5-35,800 12.1-41,300Heat output max. kW-Btu/h 24.8-84,600 28.0-95,500 31.1-106,100

EFFICIENCYSEDBUK Rating Band D D D

CHARACTERISTICSHeat loss to the casing (∆T= 50°C) % 1.2 1.1 1.5Heat loss through the flue when burner on % 5.1 5.7 5.7Heat loss through the flue when burner off % 0.4 0.4 0.4Maximum exhaust discharge (Natural Gas) kg/h 51.5 62.0 64.7Residual discharge head mbar 1.23 0.65 1.60Consumption at nominal capacity G20(1) m3/h 2.80 3.15 3.54Consumption at nominal capacity G30-G31(1) kg/h 2.09/2.06 2.35/2.31 2.64/2.60Exhaust gas temperature at nominal capacity °C 106.9 115.4 121.2Minimum ambient temperature °C 5 5 5Pressure loss through boiler (max) (∆T=20°C) mbar 200 200 200Residual head of system bar 0.25 0.25 0.25D.H.W. minimum flow rate l/min 2.5 2.5 2.5Domestic hot water pressure maximum bar 6 6 6Domestic hot water pressure minimum bar 0.2 0.2 0.2Built-in expansion vessel capacity l 7 7 7Built-in expansion vessel pre-charged vessel bar 0.7 0.7 0.7Maximum water content of system l 130 130 130Maximum heating pressure bar 3 3 3Gas inlet pressure - Natural gas (G20) mbar 20 20 20Gas inlet pressure - LPG (G30-G31) mbar 28/30-37 28/30-37 28/30-37Weight kg 34 35 36G.C. number 47-116-25 47-116-26 47-116-27

PERFORMANCECentral heating temperature maximum °C 82 82 82Central heating temperature minimum °C 42 42 42D.H.W. temperature maximum °C 56 56 56D.H.W. temperature minimum °C 36 36 36D.H.W flow rate ∆T =35°C l/min 10.2 11.4 12.7D.H.W flow rate ∆T =35°C gal/min 2.2 2.5 2.8

ELECTRICAL DATAElectrical supply V/Hz 230/50 230/50 230/50Power consumption W 120 140 165Protection grade of electrical system IP X4D X4D X4DInternal fuse rating FAST 2 AT FAST 2 AT FAST 2 AT

C*: C12, C32, C42, C52, C82; (1):15°C, 1013 mbar*Calculated at 70% maximum output

Flueconnector

Air intake(Twin flue)

Fan

Combustionchamber

hood

Main heatexchanger

Safetythermostat

Combustionchamber

Detectionelectrodes

Ignitionelectrodes

Motoriseddiverter valve

DHWtemperature

probe

Gasvalve

Sparkgenerator

DHW flowswitch

Combustionanalysisintake

Air pressureswitch

Venturitubes

Expansionvessel

3 bar safetyvalve

circulationpump withautomatic airrelease valve

MICROGENUS II 31 MFFI

mbar

ROOM-SEALED FAN FLUE24 MFFI - 28MFFI - 31 MFFI

C.H. flowtemperature

probe C.H. returntemperatureprobe

Insulatedsecondary

heatexchanger

Pumppressure

switch

Burner

2

1

FLUE PIPE ACCESSORIES - EASY INSTALLATION WITHUNRIVALED FLEXIBILITY

Ariston boilers are designed to becompletely adaptable to every possibleflue situation that may be encounteredin boiler installation. The need for alteration to fluecomponents is almost completelyeliminated, making installation of theboiler quick and easy.It is possible to site flueterminals in a variety ofpositions in accordancewith BS5440-1:2000.

TERMINAL POSITION mmA Directly above/below an opening, air brick, opening windows, etc 300B Horizontally to an opening, air brick, opening windows, etc 300C Below gutters, soil pipes or drain pipes 75D Below eaves 200E Below balconies or car port roof 200F From vertical drain or soil pipe 150G From an internal or external corner 300H Above ground roof or balcony level 300I From a surface facing the terminal 600J From a terminal facing the terminal 1200K From an opening in the car port 1200

(eg door, window) into the dwellingL Vertically from a terminal on the same wall 1500M Horizontally from a terminal in the same wall 300N Fixed by use of terminal and matched flashing plate -

INSTALLATION CONDITIONS

TYPE 1 Coaxial System

TYPE 4 Twin pipe system TYPE 5 Twin pipe system

TYPE 2 Coaxial System

TYPE 6 Twin pipe system

Vertical installation with coaxial pipingon a flat roof.

Vertical installation with coaxial pipingon a pitched roof.

Coaxial system: up to 4 m

Twin pipe system up to 30 m

Installation with two separate pipes -exhaust on a pitched roof, air inletthrough a wall.

Installation with two separate pipes -exhaust and air inlet on a pitched roofvia a coaxial adaptor.

Installation with two separate pipes -exhaust via flue duct, air inlet through awall.

1

0

TYPE 3 Coaxial System

Horizontal installation with coaxialpiping.

ACCESSORIES AND SPARE PARTSENGINEERED FORPERFECT INSTALLATION

JIG-KITSupplied within the boiler as standardThe jig-kit makes installation easierbecause it allows you to fill thesystem even without the boiler fitted.It is equipped with 4 isolation valves:2 for the heating circuit, 1 for thedomestic water system and one forthe gas. The system return isolation valve canbe connected to the system cleanerusing the cap provided. The bracketthat holds the valves can bepositioned in two ways depending onwhether installation is with or withoutthe rear-piping chassis, and allowssmall adjustments for irregular walls.

The kit is supplied with:• double non-return valves on the

filling loop for filling the system.• Copper tail pipes to ease soldering

to the system piping.

SYSTEM CLEANERA practical accessory for cleaningthe heating system. It is simple to use: connect thesystem cleaner to the system returnisolation valve, open the systemreturn isolation valve, switch on theboiler, allow the pump to run for thenecessary time then remove thesystem cleaner from the kit.The filter provided is made up of aremovable cartridge which absorbsany impurities in the system. This allows the flushing of a newheating system without theimpurities damaging the boilercomponents. The system cleaner can also beused to add chemical additives suchas cleansers and inhibitors.

REAR-PIPING CHASSISAllows easy installation in situationswhere the system pipes are requiredto run up the rear of the boiler. The rear-piping chassis consists of abracket on which the boiler is hung,this has two flanks that extend theside panel of the boiler chassis.Assemble by just bringing forwardthe valve kit and connecting thepipes. The rear-piping chassis kit includesthe pipe work elements forconnection to the system.

JIG-KIT COVERTo conceal the pipe-work or jig-kitbelow the boiler a specially designedcover is available. The cover is simplyand easily mounted to the bottom ofthe boiler.

DIGITAL TIME CLOCKThe addition of a 7 day digital timeclock allows the user to program thecentral heating to operate inconjunction with their lifestyle andweekly routine. It is possible to setthe boiler to turn on and off up to20 preset times during the week:allowing users to differentiatesetting between weekdays and theweekend for example. It is alsopossible to override the automaticsettings and operate the boilermanually at any time.

ANTI-THEFT DEVICEProtects the boiler from theft andcan be assembled in two ways: withor without the rear-piping chassis.The simple assembly instructionsare included in the jig-kit and on theanti-theft device itself.

OUTDOOR SENSORAn optional accessory tooptimise comfort and efficiency

The microGENUS II outdoortemperature sensor can increaseboth comfort and energy efficiency.The sensor works in conjunctionwith the advanced microprocessor tomonitor outside temperatures andconditions assessing the thermalpower requirements. Increasingpower when cold, decreasing powerwhen warmer therefore increasingoverall system efficiency.

for the latest product info visit:http: www.ariston.co.uk

ARISTONQUALITY PRODUCTSEXCEPTIONAL SERVICE

REGIONALTRAININGCENTRES• Plymouth• High Wycombe• Gt. Manchester

MTS (GB) LimitedMTS BuildingHughenden AvenueHigh WycombeBucks, HP13 5FTTel: 01494 755600Fax: 01494 459775

Technical Advice & Customer Service Fax 01494 463066technical@uk.mtsgroup.com

info@uk.mtsgroup.com

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COMPREHENSIVE TRAINING

Training courses are available acrossthe entire Ariston range including allthe necessary theory and practicalaspects. The courses are open toany CORGI Registered installer orengineer at fully equipped trainingcentres in High Wycombe, Plymouthand Golbourne (near Wigan) and othervenues up and down the country. Thecourses on offer include boilerinstallation, maintenance andservicing and unvented domestic hotwater systems.

TECHNICAL ADVICE

Immediate and effective technicalassistance is only a phone call away.Including advice as to which productis most suited to your needs and therequirements of your systeminstallation. Our skilled team is alsotrained to talk you through thetrickiest problems that might crop upduring an installation and answer themost obscure technical questions youcould possibly think of.

PROFESSIONAL CUSTOMERSERVICE

Ariston offers unrivalled customerservice; in the unlikely event of aproblem with an Ariston applianceall of our Customer Services teamare trained to deal with anysituation swiftly and to offer advicewhere possible. Should it benecessary for an engineer to call aspecially trained technician willsoon be on hand, prepared formost eventualities.