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Carrier 48GS Guide, ICM291 Installation guide

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7313 William Barry Blvd.
North Syracuse, NY 13212
ICM CONTROLS 800.365.5525
www.icmcontrols.com LIAF098
FEATURES
• DirectSparkIgnition(DSI)controlboard
• Microprocessor-based
• Controlscombustion,blowerandindoormotors;sparkignitor;andthegasvalve
• Monitorstiming,trialforignition,amesensingandlockout
• 100%lockoutsafetyfeature
• CompatiblewithLPorNaturalGas
• StatusLEDforfaultcodestoaidintroubleshooting
• Replaces:CarrierLH33WP003A
Install New Control
1. Groundyourself.Whenhandlingcircuitboard,holditbytheedges.
2. Fastencircuitboardwithretainingscrews.
3. Connectalllinevoltage,lowvoltage,andaccessorywires.
4. Verifythesequenceofoperation.
Safety Considerations
Onlytrainedpersonnelshouldinstallorserviceheatingequipment.Whenworkingwithheating
equipment,besuretoreadandunderstandallprecautionsinthedocumentation,onlabels,andon
tagsthataccompanytheequipment.Failuretofollowallsafetyguidelinesmayresultindamageto
equipment,severepersonalinjuryordeath.
Introduction
TheICM291DSIgasignitioncontrolreplacesthefollowingCarriermodel:LH33WP003A.The
ICM291hasincorporatedLEDdiagnosticstoassistintroubleshooting.Faultcodeinformationcanbe
foundinthisapplicationguide.Pleasekeepthisapplicationguidewiththefurnaceinstallationmanual
forfuturereference.
Electrostatic Discharge (ESD) Precautions
CAUTION!
Use caution when installing and servicing the furnace to avoid and control electrostatic discharge;
ESD can impact electronic components. These precautions must be followed to prevent
electrostatic discharge from hand tools and personnel. Following the precautions will protect the
control from ESD by discharging static electricity buildup to ground.
1. Disconnectallpowertothefurnace.Donottouchthecontrolorthewiringpriortodischargingyour
body’selectrostaticchargetoground.
2. Togroundyourself,touchyourhandandtoolstoaclean,metal(unpainted)furnacesurfacenear
thecontrolboard.
3. Servicethefurnaceaftertouchingthechassis.Yourbodywillrechargewithstaticelectricityasyou
shufeyourfeetormovearound,andyoumustregroundyourself.
4. Regroundyourselfifyoutouchungroundeditems.
5. Beforehandlinganewcontrol,regroundyourself;thiswillprotectthecontrol.Storeusedandnew
controlsinseparatecontainersbeforetouchingungroundedobjects.
6. ESDdamagecanalsobepreventedbyusinganESDservicekit.
CAUTION!
To service control, and prior to disconnection, label all wires. Failure to do so may result in wiring
errors that can cause dangerous operation.
1. TurnthermostattoOFFpositionorsetittothelowestpossiblesetting.
2. TurnOFFelectricalsupplytofurnace.
3. TurnOFFgassupplytofurnace.
CAUTION:Failuretoturnoffgasandelectricsuppliescanresultinexplosion,re,death,or
personalinjury.
4. Removefurnaceblowerandcontrolaccessdoors.
5. Disconnectthermostatwiresandhumidierwires(ifequippedwithahumidier).
6. Disconnectlinevoltage,blower,electronicaircleanerwires(ifequipped),andtransformerwires.
7. Removescrewsandanyotherfasteners,andtheoldcircuitboard.
8. Examinecontrolandcontrolboxtocheckforwaterstains.
9. Makerepairsifanysourcesofwaterleakagearefound.Besuretocheckhumidiers,evaporator
coils,andventsystemsintheareaofthecontrol.
Remove Existing Control
SPECIFICATIONS
• Controlvoltage:24VAC(18-30VAC),60Hz
• Linevoltage:208/230VAC,60Hz
• Powerconsumption: 0.3Aplusgasvalvecurrentat24VAC
• OperatingTemperature: -40°C(-40°F)to75°C(176°F)
Timing
• Pre-purge:45seconds
• TrialforIgnition:5+2seconds
• Retryperiod:every20sec.for15min.
• Lockout:manualreset
• Post-purge:45seconds
Inputs
• Power:RTandC
• Thermostatinterface:R,WandG
• Safetyswitches:RS,LS,andCS
• CombustionmotorHallEffectsensor
• FlameSensing
Outputs
• Spark
• GasValve:GV
• Combustionmotor:CM
• Blowermotor:BM
• Indoorfanmotor:IFO
LEDindicators
• RedLED: SteadyON-normaloperation
  Flashing-faultcodes
ICM291
Gas Ignition Control Board
AWcallfromtheT’statwillengagethecombustionmotor.Ignitionsequencebegins,gasvalveand
sparkareengaged,providingthatsystemsafetyswitches(RS,LS,andCS)areclosedandthereis
feedbackfromthecombustionmotorHallEffectsensor.Theblowerandindoormotorswillengage45
secondsafterameisestablishedandsensed.Theydisengage45secondsafterWcallissatised.
AGcallfromtheT’statwillengageblowerandindoormotorsrightaway.Theydisengage25seconds
afterGcallisremoved.
Sequence of Operation
Flamenotestablished
1. Ifameisnotestablishedduringthe5+2initialsequencethenthecontrolwillstartthenexttrialfor
ignitionin20seconds.
2. Theattempttoignitewillcontinuefor15minutesbeforetherespectivefaultcodeistriggeredand
ignitiontrialsarestopped.
3.Thegasvalveisenergizedonlyduringtheignitionsequenceof5+2seconds.
4. Blowerandindoorfanmotorsareoffuntilameisestablishedand45secondslater.
Flameout
1. Flameoutisconsideredwhenameislostduringheating.
2. WhenWsignalispresentandameissensedoutthenthesparkwillstartrightaway.
3. Ifameisnotestablishedontheimmediatesequence(2above)thenthecontrolwillcontinue
attemptsevery20secondsfor15minutesbeforetherespectivefaultcodeistriggeredandignition
trialsarestopped.
4. Blowerandindoorfanmotorswillcontinuerunningduringameoutscenariofor15minutes+45
seconds.
5.Combustionmotorremainsonthroughouttheameoutscenario.
Flameoutofsequence
1. FlameoutofsequencerepresentsascenariowhenameissensedwhileWsignalisnotpresent.
2. Combustion,blowerandindoorfanmotorswillbeengaged(ifnotalreadyrunning)rightawayand
keeprunningforaslongasthefaultconditionispresent.
3. Theunitisoperablebutwilldisplaythefaultcodeconstantlyuntilreplacedbyanotherfaultcodeor
powerreset.
NosignalfromtheHallaffectsensor
1. OnaWcall,iftheinputfromtheHallaffectsensor(RA0)isnotpresentformorethanaminute,
thenthecombustionmotorwillcontinuerunningendlesslyandtherespectivefaultisashed.
2. DuringrunningstateiftheinputfromtheHallaffectsensorisnotsensedthenthegasvalvewill
shutoffrightaway,blowerandindoorfanmotorswillcontinuerunningfor30secondsandthen
turnoff,combustionmotorrunscontinuously.
Troubleshooting Tips
LED Fault Codes
#OfFlashes
representsConstant
ONNormal
operation
Results
1Thecontrolhasmodiedthefanondelayto0andoffdelayto3minutes
duetosensingLStripwithin10minutesofacall
2a) LSisopenduetohightemperature(fanisn’tworkingscenario)
b) Theunitwillnotstartatrialforignitionuntiltheswitchclosesback
3
a) Flamesensedoutofsequence.
b) Theunitisoperable,howeverwilldisplaythisfaultcodeuntilpower
resetoranothercode
4a) LSopened4consecutivetimesduringacallforheating
b) ThefaultcodeisresetonthenextWcall
5a) Ignitionlockout.Thecontroltriedunsuccessfullytoignitefor15minutes
b) Theunitwillnotoperate.Requirespowerreset
6a) ThecombustionmotorisnotsensedrunningORCSopen
b) Theunitwillnotoperate.Requirespowerreset
7a) RStripped
b) Theunitwillnotoperate.Requirespowerreset
8a) Internalcontrolfault(softwareselfcheck)
Typical Wiring Diagram
LEGEND
Field Splice
Terminal (marked)
Terminal (unmarked)
Splice
Splice (marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only: Not to Represent Wiring
BR Blower Relay
C Contactor
CAP Capacitor
COMP Compressor Motor
CR Combustion Relay
EQUIP Equipment
FS Flame Sensor
FU Fuse
GND Ground
GVR Gas Valve Relay
HPS High Pressure Switch
HS Hall Effect Sensor
HV TRAN High Voltage Transformer
I Ignitor
ICM Integrated Control Motor
IDM Induced Draft Motor
IFM Indoor Fan Motor
IGC Integrated Gas Unit
Controller
IMR Indoor Motor Relay
LPS Low Pressure Switch
LS Limit Switch
MGV Main Gas Valve
OFM Outdoor Fan Motor
QT Quadruple Terminal
RS Rollover Switch
TRAN Transformer
/