Icm controls Icm291 User manual

7313 William Barry Blvd.

North Syracuse, NY 13212

ICM CONTROLS 800.365.5525

www.icmcontrols.com LIAF098-1

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

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&indoorfanmotorswillcontinuerunningduringameoutscenariofor15mins.+45secs.

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mins.

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mins.

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) Unusualgasvalveresponse

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

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)

LED indicators

• Red LED: SteadyON-normaloperation

  Flashing-faultcodes

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

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

Testing the Inducer Motor

Testing the Inducer Motor Hall Effect switch using a Voltmeter capable of reading DC Voltage

• Withthethreewireplugconnectedandpowerapplied,useaVoltmetersettoDCVandconnectthenegative (-) meter lead to pin 3andthepositive lead (+) to pin 1.Carefully

rotatetheinducerdraftmotorbyhand180degreesandthereadingshouldbeless than 1 Volt DC.Continuetorotatethemotorthrough180degreestowards360degrees.The

voltageshouldincreasetoareadingbetween6.5 VDC and 9VDCatthefull360degreemark.Iftherstreadingislessthan1VDCorthesecondreadingisnotbetween6.5&9

VDC,youshouldreplacethesensor.

• Next,movethepositive lead of the meter to pin 2leavingthenegative lead on pin 3.TakeareadingwithyourDCVmeterandthereadingshouldmeasurebetween16.5VDC

and 21VDC.Replacethesensorifthereadingisnotinrange.

• IfCode6ashesontheboard,checkforcontinuityacrossthejumperatJ2.Thejumpershouldnotbecutandshouldhavefullcontinuity.

Other ICM Controls Control Unit manuals