Danfoss 087H3803 User Manual

Howtosetacorrectheatcurve?
Shortanswer:
Settheheatcurvetothelowestpossiblevalue,butstillhaving
comfortableroomtemperature.
Thetableshowssomerecommendations:
Housewith
radiators:
Neededflowtemp.
whentheoutdoor
temp.is-10°C:
Recommen-
dedheatcurve
value:
Olderthan20years:
65°C
1.4
Between10and20
yearsold:
60°C
1.2
Rathernew:
50°C
0.8
Floorheatingsystemsneed,ingeneral,alowerheatcurvevalue
Technicalanswer:
Inordertosaveenergy,theflowtemperatureshouldbeaslowas
possible,butstillconsideringacomfortableroomtemperature.
Thismeanstheheatcurveslopeshouldhavealowvalue.
Seetheheatcurveslopediagram.
Choosethedesiredflowtemperature(verticalaxis)foryourheating
systemattheexpectedlowestoutdoortemperature(horizontalaxis)
foryourarea.Picktheheatcurveclosesttothecommonpointof
thesetwovalues.
Example:
Desiredflowtemperature:60(°C)atoutdoortemperature:
-10(°C)
Result:Heatcurveslopevalue=1.2(mid-waybetween1.4and1.0).
Ingeneral:
•Smallerradiatorsinyourheatingsystemmightrequireahigher
heatcurveslope.(Example:Desiredflowtemperature70°C
resultinginheatcurve=1.5).
•Floorheatingsystemsrequirealowerheatcurveslope.(Example:
Desiredflowtemperature35°Cresultinginheatcurve=0.4).
•Correctionsoftheheatcurveslopeshouldbedoneinsmallsteps
whenhavingoutdoortemperaturesbelow0°C;onesteppr.day.
•Ifrequired,adjusttheheatcurveinthesixcoordinatepoints.
•Settingofthedesiredroomtemperaturehasaninfluenceonthe
desiredflowtemperatureevenifaroomtemperaturesensor/
RemoteControlUnitisnotconnected.Anexample:Increasingthe
desiredroomtemperatureresultsinahigherflowtemperature.
•Typically,thedesiredroomtemperatureshouldbeadjustedwhen
havingoutdoortemperaturesabove0°C.
188|©Danfoss|2017.09
VI.GU.L2.02
OperatingGuideECLComfort210/296/310,applicationA275/A375

Danfoss 087H3803 Specifications

General

Brand	Danfoss
Model	087H3803
Category	Controller
Language	English