Danfoss 087H3803 User Manual

TheapplicationA275.2isveryflexible.Thesearethebasic
principles:
DHW(circuit2):
Bymeansofaweekschedule(upto3‘Comfort’periods/day),the
DHWcircuitcanbein‘Comfort’or‘Saving’mode(twodifferent
temperaturevaluesfordesiredDHWtemperature).
IfthemeasuredDHWtemperature(S6)islowerthanthedesired
DHWtemperature,theDHWheatingprocedurestarts:
•ThecirculationpumpP1intheheatingcircuitisswitchedOFF
•TheDHWheatingpumpP3isswitchedON
•ThedesiredboilertemperatureatS3isincreased.
Thedesiredboilertemperatureistypically10-15degreeshigher
thanthedesiredDHWtemperature.
WhenthemeasuredDHWtemperature(S6)getshigherthanthe
desiredDHWtemperature,theDHWheatingpump(P3)isswitched
OFF.StartandstopdifferencesdeterminetheON/OFFcontrol.A
post-runtimecanbeset.
Ananti-bacteriafunctionisavailableforactivationontheselected
daysoftheweek.
TheDHWheatinghaspriority,i.e.pumpP3isONandpumpP1is
OFF.Iftheapplicationhasachangeovervalve(priorityvalve)for
theDHWheating,thecirculationpumpP1isstillONduringDHW
heating.
TypicalA275.2application:
*Pressurereliefvalve
Theshowndiagramisafundamentalandsimplifiedexampleanddoes
notcontainallcomponentsthatarenecessaryinasystem.
AllnamedcomponentsareconnectedtotheECLComfortcontroller.
Listofcomponents:
S1
Outdoortemperaturesensor
S3
Boilertemperaturesensor
S5
Returntemperaturesensor
S6
DHWtanktemperaturesensor
S7Roomtemperaturesensor/ECA30
P1
Circulationpump,heating
B1Burner
P3
DHWheatingpump
A1
Alarm
Thecontrollerispre-programmedwithfactorysettingsthatareshown
intherelevantchaptersofthisguide.
VI.GU.L2.02
©Danfoss|2017.09|7
OperatingGuideECLComfort210/296/310,applicationA275/A375

Danfoss 087H3803 Specifications

General

Brand	Danfoss
Model	087H3803
Category	Controller
Language	English