Rheem HTPG EcoNet Series - EcoNet Evaporator Controller

July30,2021
# Remedy
Ensurevoltageselectorswitchissettothepropersetting(115Vor230V)andpowerharnessisconnectedtocontrollerboard.
Useavoltmetertoverifythatpropervoltageispresentonterminalboard(L1,L2)onevaporator.
Inspectcontrollerboardforvisualsignsofdamage(discoloration,burnmarks,brokencomponents,etc.).Ifdamaged,replace
controllerboard.Makesurethatnewcontrollerboardhasvoltageselectorswitchtocorrectsetting(115Vor230V) before
applyingpowertotheunit.
2 Replacecontrollerboard.
Ensurevoltageselectorswitchissettothepropersetting(115Vor230V)andpowerharnessisconnectedtocontrollerboard.
Ensurepowerisconnectedtoterminalboard(L1,L2,GND)onevaporator.
Verifyfanwiringdiagramonunitandensurethatfansarewiredtocontroller:WHITEwiretoL2,BLACKwiretoAuxRelay1on
controllerboard,REDwiretoAuxRelay2oncontrollerboard.VerifywiresfromAuxRelays1and2areconnectedtoL1on
terminalboard.VerifyeachoftheECfanmotorshasallthewiresconnected(WHITE,BLACK&RED).VerifyAuxRelaystatus:
whenAux1RelayisON,fansrunatfullspeed;whenAux1andAux2RelaysarebothON,fansrunathalfspeed.LEDwillturn
ONnexttoeachrelayoncontrollerboardtoindicaterelayisactive.UsercanalsoverifyAuxRelay1and2statusviadisplay
underStatus →Outputs→AuxRelay#1/AuxRelay#2 .
Replacefanmotor.
Verifyfanbladesandfanguardsarefreeofobstruction.
Oncontrollerdisplay,gotoSettings →SystemEnabled andensureitissettoYES.
ControlleriswaitingonEvapTemp1(andEvapTemp2onDualCoilunits)togetcoldenoughbeforeallowingfanstorun.If
unitissettoFREEZER,EvapTemphastogetbelow35Fforfanstorun;ifunitissettoCOOLER,EvapTemphastogetbelow55F
forfanstorun.VerifyAuxRelaystatus:whenAux1RelayisON,fansrunatfullspeed;whenAux1andAux2Relaysareboth
ON,fansrunathalfspeed.LEDwillturnONnexttoeachrelayoncontrollerboardtoindicaterelayisactive.Usercanalso
verifyAuxRelay1and2statusviadisplayunderStatus→Outputs→AuxRelay#1/AuxRelay#2 .
IfunitissettoFreezer,itcouldbedefrosting. Waitfordefrostcycletofinish.
VerifyfanwiringdiagramonunitandensurethatREDwireisconnectedtoAuxRelay2oncontroller,andconnectedtoevery
fanmotor.VerifywirefromAuxRelay2isconnectedtoL1onterminalboard.Fansshouldgotohalfspeedwhenbox
temperaturesetpointissatisfied.VerifyAuxRelay2statusviaLEDoncontrollernexttotherelayconnectors,andviadisplay
underStatus →Outputs→ AuxRelay#2 .
VerifyiftheunitinstalledhasPSCfanmotors.PSCfanmotorsoperateatfullspeedonlyorOFF.Therewillnotbeawire
connectedtoAuxRelay#2.
VerifySetpointandSpaceTempreading.IfSpaceTempishigherthanSetpointplustheSetpointControldifferential,allowthe2
minuteminimumofftimetofinishforcoolingtostartagain.
IfcontrollerhassoftwareversionHT‐PG01‐00‐01‐13orearlier,andisconfiguredasCooler,theairdefrostcyclewillrunthefans
athalfspeed.Morerecentsoftwareversionswillhavetheairdefrostcyclerunthefansatfullspeed.Allowtheairdefrost
cycletofinish;iffansdonotgotofullspeedwhencoolingstartsagain,proceedtonextpossiblecausebelow.
Whencoolingisenabled(EXVisopen),verifyEvapTemp1(andalsoEvapTemp2onCenterMountunits)getscoldenough
(under35FforFreezer,under55FforCooler).IfEvapTempreadingissignificantlyhigher(warmbox,malfunctioningEvap
Tempsensor),thefanswillremainoffinitially,thenrunat50%speedafteransometimeifthetemperaturestillhasnot
dropped.
VerifythatthereisnovisibledamageorburnmarksontheAuxRelays.VerifythestatusofeachAuxRelayviatheLEDnextto
eachone,viadisplayunderStatus→Outputs→AuxRelay#1/AuxRelay#2. Relayoperationforfanspeedcontrolisasfollows:
AuxRelay#1ON=FullSpeed;AuxRelays#1&#2ON=HalfSpeed;AuxRelays#1&#2OFF=Fansoff.IfdamageontheAux
Relaysisvisible,replacecontroller.
IfAuxRelaysdonotlookdamaged,confirmthatAuxRelay#2isOFF(visuallyinspectLEDisoff,statusondisplayindicatesOFF).
PoweroffunitandtemporarilydisconnecttheredwirefromAuxRelay#2.Whenunitispoweredbackon,verifyfanspeed
whenAuxRelay#1turnson.Iffanmotorsarestillrunningathalfspeed,proceedtotroubleshootfanmotors.Reconnectred
wirewhenfinished.
Ensurevoltageselectorswitchissettothepropersetting(115Vor230V)andpowerharnessisconnectedtocontrollerboard.
Ensurepowerisconnectedtoterminalboard(L1,L2,GND)onevaporator.
Oncontrollerdisplay,gotoSettings →SystemEnabled andensureitissettoYES.
IfthecontrollerdetectsthattheSpaceTempsensorinputismissing,itwillattemptcoolingoperationinfixedintervalsbased
onpreviouslycalculatedruntimeaveragesuntilthesensorisreplaced.Also,whilethesensorisdisconnected,SpaceTempwill
read"‐60⁰F"anda"A103 SpaceTempThermistorFailure "alarmwillbegenerated(viewedonthedisplayunder
Service →CurrentAlarms ).ReplacetheSpaceTempsensorassoonaspossibletoresumenormalcoolingoperationbasedon
theconfiguredSetpoint.(Partno.08219623)
VerifyEXVisproperlyconnectedtowireharnessandthatnoneofthe4prongsarebentormissing.Verifyonwireharness
connectionatthecontrollerthatnowireshavecomeloosefromtheconnector.VerifythatcontrolleriscommandingEXVto
openbylookingatthedisplayunderStatus →EXV→ EXVCurrentPos. Todoaquickverificationifthevalveisworking,a)
disconnectpowertothecontrollerandlistenformovementoftheEXV(controllerwillforcevalvetoclosecompletelywhen
powerisdisconnected),ORb)gotoSettings →SystemEnable andsetittoNO.Reconnectpowertothecontroller,orset
SystemEnable backtoYES,andwaitacoupleofminutestolistenforEXVmovement(valveshouldopenifSpaceTempSetpoint
isnotsatisfied).See
AddendumAonhowtotroubleshoottheEXV.
8
VerifySuctionPressurereadingonthedisplayunder Status →Sensors→SuconPressure .Ifthesystemischargedproperly,the
SuctionPressurereadingshouldstartincreasingassoonasthevalveopens.Verifyatthecondensingunitifthecompressoris
running.VerifythatpowertothecondensingunitisturnedON.Verifythatthecut‐in/cut‐outpressureswitchesatthe
compressoraresetproperlyfortherefrigerantbeingused(refertocondensingunitinstallationmanual).
EcoNetEvaporatorController TroubleshootingGuide
1
Nopowertocontroller.
Oneormorefanwiresaredisconnected.
Fanmotorcouldbedamaged.
EvapTemp1temperatureisnotcoldenough(on
SingleCoilunits);EvapTemp1andEvapTemp2
temperaturesnotcoldenough(onDualCoilunits).
EcoNetcontrollercouldbemanuallydisabled;
SystemEnabledissettoNOinthecontroller
settings.
4 Noneofthefansarerunning.
3 Oneormorefansarenotrunning.
Fanbladescouldbeobstructed.
Controllerturnsonbutdisplayismissing
linesorblank.
EcoNetControllerdoesnotturnon.
Nopowertocontroller
Controllerboardcouldbedamaged.
Controllerboarddisplayisdamaged.
5
7
Halfspeedfanwire(RED)couldbe
disconnected/loose.
Controllercouldbemanuallydisabled;System
EnabledissettoNOinthecontrollersettings.
Nopowertocontroller.
Controllercouldbeenabled,butEXVisnot
opening.
Verifyifcompressorisrunning.
EXVisoperating,butunitisstillnot
cooling.
6
Unitisnotcooling.
Fansrunbutnevergotohalfspeed.
UnithasPSCfanmotorsinstalled.
AuxRelayscouldbedamaged
Fanmotorscouldbemalfunctioning
Coolerisinthemiddleofadefrostcycle
Problem
SpaceTempsensorisdisconnected.
PossibleCause
Fansrunbutnevergotofullspeed.
Setpointissatisfied
EvapTempisnotlowenough.
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