Danfoss ECL Comfort A260 User Manual

TheapplicationA375.1isveryflexible.Thesearethebasic
principles:
TheapplicationsA375.1/A375.2/A375.3canON/OFFcontrolup
to8burnersteps.
InapplicationA375.1thefirst4burnerstepsarecontrolledby
relaysintheECL310.Thenext,max.4burnersteps,arecontrolled
byrelaysintheextensionmoduleECA32(placedinthebasepart
oftheECL310).
Heating(circuit1):
Typically,thecommonboilertemperatureisadjustedaccordingto
yourrequirements.TheboilertemperaturesensorS3isthemost
importantsensor.Itmustbeplacedcorrectlyinordertomeasure
thecommonboilertemperature.Thedesiredboilertemperature
atS3iscalculatedintheECLcontroller,basedontheoutdoor
temperature(S1).Thelowertheoutdoortemperature,thehigher
thedesiredboilertemperature.Theboilertemperatureisalsothe
flowtemperatureinthedirectconnectedheatingcircuit.
Bymeansofaweekschedule(upto3‘Comfort’periods/day),the
heatingcircuitcanbein‘Comfort’or‘Saving’mode(twodifferent
temperaturevaluesforthedesiredroomtemperature).In'Saving'
modea'Totalstop'functioncanbeselectedinordertoswitchOFF
theheating.
ThefirstburnerstepisswitchedONwhenthecommonboiler
temperatureislowerthanthedesiredboilertemperature.The
controllerobservesthecommonboilertemperatureandswitches
ONthenextburnerstepifthecommonboilertemperaturedoes
notincreasesatisfactorily.TheswitchingOFFprocedureofburner
stepsisviceversa.AswitchingdifferencedeterminestheON/OFF
control.
Theburnerscanbecontrolledin:
•fixedsequence(example:Always1-2-3-4-5)or
•automaticrotatingsequence(example:Firstperiod:1-2-3-4-5,
secondperiod:2-3-4-5-1,thirdperiod:3-4-5-1-2andsoon)
•semi-automaticrotatingsequence(example:Firstperiod:1,
2-3-4-5,secondperiod:1,3-4-5-2,thirdperiod:1,4-5-2-3and
soon)
Furthermore,theboilerprotectionfunctionwillswitchONthe
circulationpumpwhentheboilertemperaturegetsabovea
minimumvalue.AminimumON-timecanbesetfortheburnerin
ordertoincreasetheboiler'sefficiency.
Thereturntemperature(S5)totheboilershouldnotbetoo
high(condensingboiler)ortoolow(oilorgasfiredboiler).Ifso,
thedesiredboilertemperaturecanbedecreasedorincreased.
Furthermore,thereturntemperaturelimitationcanbedependent
oftheoutdoortemperature.Typically,thelowertheoutdoor
temperature,thehighertheacceptedreturntemperature.
Ifthemeasuredroomtemperature(S7orRemotecontrolunitECA
30)doesnotequalthedesiredroomtemperature,thedesired
boilertemperaturecanbeadjusted.
Thecirculationpump(P1)isONatheatdemandoratfrost
protection.
TheheatingcanbeswitchedOFFwhentheoutdoortemperatureis
higherthanasetvalue.
Thedesiredcommonboilertemperaturecan,viaS10,becontrolled
bymeansofanexternalvoltageintherange0-10volt.
TypicalA375.1application:
*Pressurereliefvalve
Theshowndiagramisafundamentalandsimplifiedexampleanddoes
notcontainallcomponentsthatarenecessaryinasystem.
AllnamedcomponentsareconnectedtotheECLComfortcontroller.
Listofcomponents:
S1
Outdoortemperaturesensor
S3
Commonboilertemperaturesensor
S5
Returntemperaturesensor
S7Roomtemperaturesensor/ECA30
(S10)
(Externaltemperaturecontrol,notillustrated)
P1
Circulationpump
B1–B8Burner1...8
A1
Alarm
Thecontrollerispre-programmedwithfactorysettingsthatareshown
intherelevantchaptersofthisguide.
Boilersequencerotation/shifttakesplaceatmidnight.
12|©Danfoss|2017.09
VI.GU.L2.02
OperatingGuideECLComfort210/296/310,applicationA275/A375

Danfoss ECL Comfort A260 Specifications

General

Brand	Danfoss
Model	ECL Comfort A260
Category	Controller
Language	English