ICM Controls ICM2909 Manual

ICM Controls ICM2909 Manual Manual pdf 1 page image

LIAF299-1ICM2909Direct Spark Ignition (DSI) control boardFeaturesDirect Spark Ignition (DSI) control boardMicroprocessor-basedMonitors timing, trial for ignition, system switches, flame sensing andlockout.100% lockout safety featureCompatible with LP or Natural GasLED indication for status and fault codes to aid in troubleshootingSpecificationsReplaces• Rheem: 62-23599(-01,-02,-03,-04,-05)ELECTRICAL SHOCK HAZARD! Before installing this unit, turnoff power at the main service panel by removing the fuse or switching theappropriate circuit breaker to the OFF position. Follow all Local, State andNational Electrical Codes when installing this device.CAUTION! Only trained personnel should install or service heatingequipment. When working with heating equipment, be sure to read andunderstand all precautions in the documentation, on labels, and on tags thataccompany the equipment. Failure to follow all safety guidelines may result indamage to equipment, severe personal injury or death.> > > CAUTION < < <IntroductionThe ICM2909 DSI control replaces the following Rheem models: 62-23599(-01,-02,-03,-04,-05). The ICM2909 has incorporated LED diagnostics to assist in troubleshooting. Faultcode information can be found in this application guide. Please keep this application guidewith the furnace installation manual for future reference.Remove Existing ControlCAUTION! To service control, and prior to disconnection, label all wires. Failureto 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,fire, death or personal 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) andtransformer 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,evaporator coils and vent systems in the area of the control.Install New 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.Sequence of OperationWhen a W call is received from the thermostat; the control shall perform a hardware safetycheck before progressing with the heat sequence. If no issues are detected during thehardware safety check; the Inducer Draft motor is energized. The Vent Pressure switchcloses. Ignition sequence begins; gas valve and spark are engaged, providing the systemsafety switches (Limit and MRLC) are closed. The Blower motor will engage at the HEATspeed 30 seconds after flame is established and sensed. Once the W call has beensatisfied; the Inducer motor turns off after 5 seconds and the blower motor turns off after 90seconds.A G call from the thermostat will engage the blower motor without delay at the HEAT speed.It disengages without delay when the G call is removed.A Y call from the thermostat will engage the blower motor without delay at the COOLspeed. It disengages 30 seconds after the Y call is satisfied.Flame Sense Troubleshooting TipsFlame not established1. If flame is not established during the 7 second initial sequence then the control will startthe next trial for ignition in 60 seconds.2. There will be 2 more attempts to ignite, 60 seconds apart before the respective faultcode is triggered and ignition trials are stopped.3. The gas valve is energized only during the ignition sequence of 7 seconds.4. The blower motor is off until 30 seconds after flame is established.Flame out1. Flame out is considered when flame is lost during the heating cycle.2. When a signal is present on W and flame is not sensed; the gas valve will disengageuntil the next trial for ignition3. The inducer motor will continue running during flame out scenario and the blower motorwill turn off after the 90 second post purge.Flame out of sequence1. Flame out of sequence represents a scenario where flame is sensed while the W signalis not present.2. Inducer and Blower motors will be engaged (if not already running) and will continuerunning for as long as the fault condition is present.3. There is 60 minute lockout before a W call can be executed or on power resetInputs• Line voltage: 240 VAC, 50/60 Hz• Control voltage: 18-30 VAC, 50/60 Hz• System switches: Vent pressure, limit and MRLC (Manual Reset Limit Control)Outputs• Heat N.C.: 16FLA/36 LRA @ 240 VAC• Cool N.O.: 15FLA/30 LRA @ 240 VAC• Inducer: 4FLA/4LRA @ 240 VAC• Gas valve: 2.3 A PILOT DUTY @ 240 VACEnvironmental• Operating temperature: -40˚F to 175˚F (-40˚C to 80˚C)• Storage temperature: -40˚F to 185˚F (-40˚C to 85˚C)• Humidity: 5% - 95% R.H. (non-condensing) at +55˚C• Dimensions: 6.60” x 5.75” x 2.25”5018419FAULT CODES, STATUS LIGHTS AND TROUBLESHOOTINGFlashes Fault Condition Trouble ShootingON solid Normal operation NormalOFF No power or incorrect gas valve wiring Check for 24VAC to the board,check door switch, check supply transformer primary and secondary voltage, make sure gasvalve is wired correctly and grounded properly.1 Flame loss or ignition failure lockout Flame was lost or the number of retry’s or recycles has exceeded the limit for the control. Clean or replace the flame sensor,check the igniter for proper operation & input voltage, check the transformer’s common is grounded to earthground2 Pressure switch stuck open or stuckclosedCheck 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.3 Limit switch open Check for blocked airflow, blocked duct work and dirty filter. Check or replace high limit switch if defective.4 Flame detected with gas valve closed Flame was sensed when no flame is present. Check or replace flame sensor and check the grounds.5 Manual Reset Limit Control is open Check for plugged flue pipe, check for cracked heat exchanger, check for flame rollout.6 Internal Error Internal board failure, replace control board

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