ICM Controls ICM2914 Installation, Operation & Application Manual
Also see for ICM2914: Installation, operation & application guide
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Installation, Operation & Application GuideFor more information on our complete range of American-madeproducts – plus wiring diagrams, troubleshooting tips and more,visit us at www.icmcontrols.comICM2914Gas Ignition Replacement Board• Controls blower motors, gas valve, & spark ignitor in sequence• Protects against short cycling• Selectable Heat/Cool blower off-delay time• Flash codes from the onboard LED indicate specific problems for easier troubleshooting• Repeated ignition failures or flame losses will disable heat operation for safetyFEATURESThe ICM2914 is a form, fit, and functional replacement for the boards shown in the cross-referencesection of this guide. The control boards are designed as automated gas ignition controls which monitorthe ignition sequence including the inducer, pressure switch, spark ignition, gas valve, flame sense, andcirculating blower while maintaining full safety circuit monitoring including the high limit switch, roll outswitch and auxiliary limit switch circuits. Onboard diagnostics will indicate when a fault condition exists.INTRODUCTION• Line frequency: 50/60 Hz• Control voltage: 18-30 VAC• Hi-efficiency blower: 10 mA @ 24 VAC• Inducer blower: 10 mA @ 24 VAC• Combined gas valve load: 1.5 A @ 24 VAC• Minimum flame signal threshold: 0.75 uASPECIFICATIONSTRANE P/N #: D674712P01REPLACESCAUTION! To service control, and prior to disconnection, label all wires. Failure to do so mayresult 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, fire, death orpersonal injury.4. Remove the furnace blower and control access doors.5. Disconnect the thermostat wires and humidifier wires (if equipped with a humidifier).6. Disconnect the 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 the control and the control box for water stains.9. Make repairs if any sources of water leakage are found. Be sure to check humidifiers, evaporatorcoils and vent systems in the area of the control.REMOVE EXISTING CONTROL1. 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. Verify the sequence of operation.INSTALL NEW CONTROLOn 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.• When the control verifies the pressure switch has closed, the control will start a 20-second prepurge.• When the pre-purge time delay is over, the control will energize the gas valve and initiate spark.• The ignitor must be de-energized when the flame is sensed or at the conclusion of the trial for ignitionperiod, whichever comes first.• When flame is sensed, the control will energize the circulator fan within the ON-delay period.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:On a call for cooling (24Vac on Y and G), the circulator fan is energized within the cool on delay period.The control will ignore a call for Y without a call for G. After the thermostat is satisfied, the compressoris de-energized and the jumper selected cool Off delay period begins. Following the cooling Off delayperiod, the circulator fan is de-energized.OPERATIONELECTRICAL SHOCK HAZARD! Before installing this unit, turn off power at themain service panel by removing the fuse or switching the appropriate circuit breaker tothe OFF position. Follow all Local, State and National Electrical Codes when installingthis device.CAUTION! Only trained personnel should install or service heating equipment. Whenworking with heating equipment, be sure to read and understand all precautions in thedocumentation, on labels, and on tags that accompany the equipment. Failure to followall safety guidelines may result in damage to equipment, severe personal injury or death.> > > CAUTION < < <FAULT CODES, STATUS LIGHTS AND TROUBLESHOOTINGFlashes Fault Condition Trouble ShootingSolid RED Internal Control Board error Internal board failure, replace control boardSolid RED w/Solid Status LED Continuous reset Reset caused by internal board failure, replace the control board2 Lockout The number of retry’s or recycles has exceeded the limit for the control. Clean or replace the flame sensor, check the igniter forproper operation & input voltage, check the transformer’s common is grounded to earthground.3 Pressure switch or Inducer error Check for obstructed pressure switch tubing or defective pressure switch. Check for oxidation on terminals, broken wires, ordefective inducer motor . Check for proper voltage at the inducer motor input.4 Open limit switch Check for blocked airflow, blocked ductwork, and dirty filter. Check or replace high limit switch ifdefective.5 False Flame Flame was sensed when no flame is present. Check or replace flame sensor and check the grounds.6 Not used7 External 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.8 Low flame sense A multimeter can be used to test flame sense by placing the meters probes on the two test pins and taking a DC voltage readingwhile the flame sensor is in the presence of flame. 1VDC = 1μA flame current. Weak or poor flame sense is represented by areading 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• Ignition failed (flame not sensed) 4 times in one heat callLOCK 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). |
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