Icm controls Icm291 User guide

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

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

ICM Controls ICM291 User guide