Installation, Operation & Application Guide
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ICM2916
Gas Ignition Replacement Board
• Controls blower motors, gas valve, & spark ignitor in sequence
• Protects against short cycling
• Selectable Heat/Cool blower off-delay time
• FlashcodesfromtheonboardLEDindicatespecicproblemsforeasiertroubleshooting
• Repeatedignitionfailuresoramelosseswilldisableheatoperationforsafety
FEATURES
INTRODUCTION
• Line voltage: 240 VAC
• Line frequency: 50/60 Hz
• Control voltage: 18-30 VAC
• Hi-efciencyblower:10 mA @ 24 VAC
• Inducer blower: 0.7 FLA, 1.5 LRA @ 240 VAC
• Combined gas valve load: 1.5 A @ 24 VAC
• Minimumamesignalthreshold:0.75 uA
SPECIFICATIONS
TRANE P/N #: D674712P02
REPLACES
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 the OFF position or set it to the lowest possible setting.
2. Turn OFF the electrical supply to furnace.
3. Turn OFF the gas supply to furnace.
CAUTION!
Failure to turn off gas and electric supplies can result in explosion, re, death or
personal injury.
4. Remove the furnace blower and control access doors.
5. Disconnectthethermostatwiresandhumidierwires(ifequippedwithahumidier).
6. Disconnectthelinevoltage,blower,electronicaircleanerwires(ifequipped)andtransformerwires.
7. Remove screws and any other fasteners and the old circuit board.
8. Examine the control and the control box for water stains.
9. Makerepairsifanysourcesofwaterleakagearefound.Besuretocheckhumidiers,evaporator
coils and vent systems in the area of the control.
REMOVE EXISTING CONTROL
1. Ground yourself. When handling the circuit board; hold it by the edges.
2. Fasten the circuit board with the retaining screws.
3. Connect all line voltage, low voltage and accessory wires.
4. Verifythesequenceofoperation.
INSTALL NEW CONTROL
On a call for heat (24 VAC on the W input), the following occurs:
• Upon a call for heat the control checks the status of the pressure switch; if the pressure switch is open,
the control will energize the draft inducer.
• Whenthecontrolveriesthepressureswitchhasclosed,thecontrolwillstarta20-secondprepurge.
• When the pre-purge time delay is over, the control will energize the gas valve and initiate spark.
• Theignitormustbede-energizedwhentheameissensedorattheconclusionofthetrialforignition
period,whichevercomesrst.
• Whenameissensed,thecontrolwillenergizethecirculatorfanwithintheON-delayperiod.
When the call for heat is terminated, the following occurs:
• The control shall de-energize the gas valve and the draft inducer within the post purge period.
• When the heat mode fan OFF delay timer expires, the control will de-energize the circulator fan.
With a call for cooling, the following occurs:
Onacallforcooling(24VaconYandG),thecirculatorfanisenergizedwithinthecoolondelayperiod.
ThecontrolwillignoreacallforYwithoutacallforG.Afterthethermostatissatised,thecompressor
is de-energized and the jumper selected cool Off delay period begins. Following the cooling Off delay
period, the circulator fan is de-energized.
OPERATION
ELECTRICAL SHOCK HAZARD!
Before installing this unit, turn off power at the
main service panel by removing the fuse or switching the appropriate circuit breaker to
the OFF position. Follow all Local, State and National Electrical Codes when installing
this device.
CAUTION!
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.
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CAUTION
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FAULT CODES, STATUS LIGHTS AND TROUBLESHOOTING
Flashes Fault Condition Trouble Shooting
Solid RED Internal Control Board error Internal board failure, replace control board
Solid RED w/Solid Status LED Continuous reset Reset caused by internal board failure, replace the control board
2Lockout Thenumberofretry’sorrecycleshasexceededthelimitforthecontrol.Cleanorreplacetheamesensor,checktheigniterfor
properoperation&inputvoltage,checkthetransformer’scommonisgroundedtoearthground.
3Pressure switch or Inducer error Check for obstructed pressure switch tubing or defective pressure switch. Check for oxidation on terminals, broken wires, or
defective inducer motor . Check for proper voltage at the inducer motor input.
4Open limit switch Checkforblockedairow,blockedductwork,anddirtylter.Checkorreplacehighlimitswitchif
defective.
5False Flame Flamewassensedwhennoameispresent.Checkorreplaceamesensorandcheckthegrounds.
6Notused
7External Gas valve circuit error Check the wires going to the gas valve for proper connection and ensure the gas valve is not mis-wired. Also, check for corro-
sion on gas valve terminals and clean up the gas valve ground.
8Lowamesense AmultimetercanbeusedtotestamesensebyplacingthemetersprobesonthetwotestpinsandtakingaDCvoltagereading
whiletheamesensorisinthepresenceofame.1VDC=1µAamecurrent.Weakorpooramesenseisrepresentedbya
reading of 0.7 VDC or lower.
The control will go into a 1-hour soft lockout if the following faults are detected:
• Limit switch open 4 times in one heat call
• Ignitionfailed(amenotsensed)4timesinoneheatcall
LOCK OUT CONDITION
• Flame lost after successful ignition 3 times in one heat call
• Gas valve sensed on when it should not be
• Gas valve sensed off when it should be on, 10 times in one heat call
**NOTE: Flame sensed while the gas valve is closed puts the control in lockout state, but lockout clears after the blower off delay is complete (90 seconds or 60 seconds, depending on jumper selection).
