
2.0nstallation
2.1Beforeyoustart
Theapplications(subtypes)intheA377applicationkeyarevery
flexibleandalmostidentical.
However,someapplicationshaveextrafunctionswhichare
describedseparately.
Thesearethebasicprinciples:
Heating(circuit1):
Typically,theflowtemperatureisadjustedaccordingtoyour
requirements.TheflowtemperaturesensorS3isthemost
importantsensor.ThedesiredflowtemperatureatS3iscalculated
intheELcontroller,basedontheoutdoortemperature(S1).
Thelowertheoutdoortemperature,thehigherthedesiredflow
temperature.
Bymeansofaweekschedule(upto3‘omfort’periods/day),the
heatingcircuitcanbein‘omfort’or‘Saving’mode(twodifferent
temperaturevaluesforthedesiredroomtemperature).
InSavingmodetheheatingcanbereducedorswitchedofftotally.
ThemotorizedcontrolvalveM2isopenedgraduallywhenthe
flowtemperatureislowerthanthedesiredflowtemperatureand
viceversa.
Thereturntemperature(S5)tothedistrictheatingsupplyshould
notbetoohigh.Ifso,thedesiredflowtemperaturecanbeadjusted
(typicallytoalowervalue),thusresultinginagradualclosingof
themotorizedcontrolvalve.Furthermore,thereturntemperature
limitationcanbedependentontheoutdoortemperature.
Typically,thelowertheoutdoortemperature,thehigherthe
acceptedreturntemperature.
Inboiler-basedheatingsupplythereturntemperatureshouldnot
betoolow(sameadjustmentprocedureasabove).
Ifthemeasuredroomtemperature(RemotecontrolunitEA30/
31)doesnotequalthedesiredroomtemperature,thedesiredflow
temperaturecanbeadjusted.
Thecirculationpump(P2)isONatheatdemandoratfrost
protection.
TheheatingcanbeswitchedOFFwhentheoutdoortemperatureis
higherthanaselectablevalue.
AconnectedfloworenergymeterbasedonM-bussignalcanlimit
thefloworenergytoasetmaximumvalue.Furthermore,the
limitationcanbeinrelationtotheoutdoortemperature.
Typically,thelowertheoutdoortemperature,thehigherthe
acceptedflow/power.
Thedesiredflowtemperatureofheatingcircuit1can,viaS7,be
controlledbymeansofanexternalvoltageintherange0-10volt.
Thefrostprotectionmodemaintainsaselectableflowtemperature,
forexample10°.
Analarmcanbeactivatediftheactualflowtemperaturediffers
fromthedesiredflowtemperature.
TheroomtemperaturesignalcanbeachievedfromtheRemote
ontrolUnitEA30/31,ifconnected.
A377.2:
WhenbothDHWheating/chargingandheatingcircuit1are
active,thecirculationpumpintheheatingcircuitcancontinue
operating.Theheatingcircuittemperatureistypicallyincreased.
Thisisparallelmode.Iftheincreaseoftheflowtemperature
cannotbeaccepted,thecirculationpumpinheatingcircuitcanbe
stopped.ThisisDHWprioritymode.
TypicalA377.1application,examplea:
Theshowndiagramisafundamentalandsimplifiedexampleanddoes
notcontainallcomponentsthatarenecessaryinasystem.
AllnamedcomponentsareconnectedtotheELomfortcontroller.
Listofcomponents:
CL310lectroniccontrollerCLComfort310
S1Outdoortemperaturesensor
S2Returntemperaturesensor,circuit2
S3Flowtemperaturesensor,circuit1
S4Flowtemperaturesensor,circuit2
S5Returntemperaturesensor,circuit1
S6DHWtanktemperaturesensor,upper
(S7)(xternaltemperaturecontrol,notillustrated)
S8DHWtanktemperaturesensor,lower
S9DHWflowtemperaturesensor,circuit3
S10Returntemperaturesensor,circuit3
M1Motorizedcontrolvalve(3-pointcontrolled),circuit3
Alternative:Thermoactuator(DanfosstypeABV)
M2Motorizedcontrolvalve(3-pointcontrolled),circuit1
Alternative:Thermoactuator(DanfosstypeABV)
M3Motorizedcontrolvalve(3-pointcontrolled),circuit2
Alternative:Thermoactuator(DanfosstypeABV)
P1DHWheatingpump(notillustrated)
P2Circulationpump,heating,circuit1
P3DHWcirculationpump
P4DHWchargingpump
P5Circulationpump,heating,circuit2
A1Alarm
A/BInternal/externalconnectionsforDHWcirculation
6|©Danfoss|2017.10VI.GU.F6.02
OperatingGuideECLComfort310,applicationA377