
2.0Installation
2.1Beforeyoustart
TheapplicationA267isveryflexible.Thesearethebasicprinciples:
Heating(circuit1):
Typically,theflowtemperatureisadjustedaccordingtoyour
requirements.TheflowtemperaturesensorS3isthemost
importantsensor.ThedesiredflowtemperatureatS3iscalculated
intheECLcontroller,basedontheoutdoortemperature(S1).
Thelowertheoutdoortemperature,thehigherthedesiredflow
temperature.Bymeansofaweekschedule(upto3‘Comfort’
periods/day),theheatingcircuit1canbein‘Comfort’or
‘Saving’mode(twodifferenttemperaturevaluesfordesiredroom
temperature).
ThemotorizedcontrolvalveM1isopenedgraduallywhenthe
flowtemperatureislowerthanthedesiredflowtemperatureand
viceversa.
Thereturntemperature(S5)tothedistrictheatingsupplyshould
notbetoohigh.Ifso,thedesiredflowtemperaturecanbeadjusted
(typicallytoalowervalue),thusresultinginagradualclosingofthe
motorizedcontrolvalve.
Furthermore,thereturntemperaturelimitationcandepend
ontheoutdoortemperature.Typically,thelowertheoutdoor
temperature,thehighertheacceptedreturntemperature.
Inboiler-basedheatingsupplythereturntemperatureshouldnot
betoolow(sameadjustmentprocedureasabove).
Ifthemeasuredroomtemperature(S7)doesnotequalthedesired
roomtemperature,thedesiredflowtemperaturecanbeadjusted.
Thecirculationpump(P1)isONatheatdemandoratfrost
protection.Thecirculationpump(P1)canbeswitchedOFF
whenheatingtheDHW(dependentpriority).Ifthesystemhas
achangeovervalve(P2)betweentheheatingandDHWheating
circuit,thecirculationpump(P1)isONwhenheatingtheDHW.
TheheatingcanbeswitchedOFFwhentheoutdoortemperatureis
higherthanaselectablevalue.
TypicalA267application:
Theshowndiagramisafundamentalandsimplifiedexampleanddoes
notcontainallcomponentsthatarenecessaryinasystem.
AllnamedcomponentsareconnectedtotheECLComfortcontroller.
Listofcomponents:
S1Outdoortemperaturesensor
S2eturntemperaturesensor,circuit2
S3Flowtemperaturesensor,circuit1
S4Flowtemperaturesensor,circuit2
S5eturntemperaturesensor,circuit1
S6DHWtanktemperaturesensor,upper
S7oomtemperaturesensor,circuits1and2
S8DHWtanktemperaturesensor,lower
P1Circulationpump,heating,circuit1
P2DHWheatingpump,circuit3
P3DHWcirculationpump,circuit3
P4Circulationpump,heating,circuit2
M1Motorizedcontrolvalve,circuits1and3
M2Motorizedcontrolvalve,circuit2
VI.GU.G2.02©Danfoss|2018.01|5
OperatingGuideECLComfort210/296,applicationA267