Control Functions And Benefits

Control Functions and BenefitsAlbin SAL. – Eng. Wael Zmerly - 2004

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Control Functions and Benefits

Eng. Wael Zmerly

08/09/2004


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Why fit Control ?


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Why fit Control ? - More Comfort

More comfort is achieved by:•Maintaining accurate system temperatures.•Ensuring quiet system operation.•Preventing excessive temperatures on heating surfaces.•Providing the right amount of heat when and where you want it.

More Comfort


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Why fit Control ? - Energy SavingEnergy savings is achieved by:•Minimizing boiler short cycling.•Operating the boiler and the heat distribution system efficiently.•Shutting down the system when no heat is required.•Operating the system at the lowest practical water temperature.

Energy Saving

Heating & Hot Water

70%

Apliances20%

Lighting10%


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Why fit Control ? - High Quality

High quality is achieved by:•Protecting the boiler from corrosion and thermal shock.•Preventing excessive temperatures in the heating system.•Preventing corrosion and precipitate build up by exercising system components.•Minimizing cycling of equipment.•Providing high quality controls.

High Quality


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Why fit Control ? - Ease of UseEase of use is achieved by:•Providing easy and consistent wiring and installation procedures.•Providing feasible mounting options of enclosures.•Providing automatic testing of wiring and detection of sensor faults.•Minimizing manual settings through automatic functions.•Providing visual readouts of system status.

Ease of Use


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Boiler Control

On/

Off

Diff

eren

tial

Con

stan

t Boi

ler

Tem

pera

ture

Out

door

Res

et

Outdoor Air Temperature

20

30

40

Supp

ly W

ater

Tem

pera

ture

Constant BoilerTemperature

Boi

ler

Diff

eren

tial

20

30

70

90


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Boiler ControlB

oile

r M

inim

um S

uppl

y

Soft

Sta

rt

Boi

ler

Post

Pur

ge

Time Supp

ly T

empe

ratu

re

Expansion Noises

Normal Operation

Soft Start


20

30

40

Supp

ly W

ater

Tem

pera

ture

Boiler MinumSupply


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Conmfort Range

TOO COOL ZONE

TOO WARM ZONE

TOO COOL ZONE

TOO WARM ZONE

TOO COOL ZONE

TOO WARM ZONE

Wasted Fuel and

Discomfort

Com

fort

Ran

ge

Win

ter

Com

fort

Con

vent

iona

l Con

trol

Inte

llige

nt C

ontr

ol


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Thermostatic Radiator ValveSwimming pool

Bathroom

Work room or children’sbedroomLiving or dining rooms(Basic setting)

Hobby room, bedroom

All rooms at night(nighttime reduction)Stairway, vestibule

Basement/cellar rooms(frost protection setting)

Kitchen, corridor


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Thermostatic Radiator Valve Installation

Underfloorconvector

Built-incabinet

IncorrectThe thermo-static headwith built-insensor maynot be mountedvertically.

CorrectThe remote sen-sor enables anunhindered reading of theair temperaturein the room.

CorrectCirculation ofair around thethermostatichead is nothindered.

IncorrectThe thermosta-tic head withbuilt-in sensormay not becovered by curtains.

3/4”

100

50 30


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Room Thermostat

PROG

AUTO

DAY COPY

Intel l i ther m C55

+

+AU T O

The

rmos

tat i

nsta

llatio

n

Roo

m T

herm

osta

t

Prog

ram

mab

le T

herm

osta

t

Wir

eles

s The

rmos

tat

M S - +21 C°


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Room ControllerR

oom

Sen

sor

Roo

m C

ontr

olle

r

Room Sensor Controller

The

rmos

tat A

pplic

atio

n

The

rmos

tat A

pplic

atio

n


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Outdoor Reset

ConstantRoom Temperature

OutdoorTemperature Drop

HeatLoss Increase

Heat Out

Heat in Heat in

Heat Out

Heat in=

Hea

t Los

ses

Outdoor Temperature °C

Boi

ler T

empe

ratu

re

°C

-5 0 5 10 15 20-10-15-20 25

4050607080

30 Outdoor Control

Conventional Control

Ther

mos

tat S

ettin

g °C

2322

1920

2425

1817

21

TimeTol

eran

ces

Var

iabl

e B

oile

r T

empe

ratu

re

100

Con

stan

t Spe

ed


15

Outdoor Reset

Supp

ly T

empe

ratu

re

Hea

ting

Cur

ve

Cha

ract

eriz

ed H

eatin

g C

urve

Boi

ler

Tem

pera

ture

20

30

70

90

20

30

70

90

20

30

70

90

20

30

70

90


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Outdoor Reset


20

15 10 05 0025 20

30

40

50

60

70

80

90

Supp

ly W

ater

Tem

pera

ture

oC

Indoor Sensor

More Heat

Less Heat

Diff

eren

tial F

eedb

ack


20

15 10 05 0025 20

30

40

50

60

70

80

90

Supp

ly W

ater

Tem

pera

ture

oCNig

ht S

etba

ck


Supp

ly W

ater

Tem

pera

ture

Indoor Sensor

Indoor > Setting

Indoor < Setting

Indo

or F

eedb

ack

Requiredday timetemperature

Overnight temperature

Normal switch-on time

Delayed switch-on timewith Optimum Start

Occupancy/wake-up time

POTENTIALSAVING

Tem

pera

ture

Delay PeriodO

ptim

um S

tart


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Outdoor Reset


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Domestic Hot Water Control

Yearly Heating Operation for a typical

family house

(4 persons)

50000 Liters of Hot Water

8000 System Operating Hours

1000 Burner Run Hours

5000 on/off cycles

1

2

3

0 4

bar


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Domestic Hot Water ControlD

HW

Con

trol

DH

W C

ircu

latio

n

DH

W P

rior

ity

Sola

r W

ater

Hea

ting


20

DH

W O

ptim

izat

ion

DH

W S

etba

ckDomestic Hot Water Control

Opt

imum

Sta

rt

DH

W B

oile

r R

eset

Ove

rrid

e


20

30

40

Supp

ly W

ater

Tem

pera

ture


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Domestic Hot Water Areas of Risk

Time to produce a 2nd & 3 degree burn to adult Skin:

rd

70°C About 1/2 seconds65°C About 1-1/2 seconds

55°C About 30 seconds52°C About 2 minutes50°C More than 5 minutes40°C No hazard

Scal

ding

Leg

ione

lla

0 10 20 30 40 50 60 70

Inst

ant

de

ath

of b

ac

teria

De

ath

of 9

0% o

f ba

cte

riain

2 m

inut

es

De

ath

of 9

0% o

f ba

cte

riain

2 h

our

s

Op

timum

te

mp

era

ture

fo

r gro

wth

of b

ac

teria

Surv

ivin

g b

ac

teria

ina

ctiv

e

BATHS 43 C°

WASH 40 CBASINS

° ROWS OFBASINS

°

KITCHEN 48 CSINKS°

SHOWERS 40 C°

BIDETS37 C°

DH

W S

afe

Tem

pera

ture

Control Functions And Benefits

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