ICM CONTROLS ICM292A Gas Ignition Control Board Instruction Manual

CONTROLS ICM292A Gas Ignition Control Board
Instruction Manual ICM292A
Gas Ignition Control Board

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.

FEATURES

• Direct Spark Ignition (DSI) control board
• Microprocessor-based
• Controls inducer motors, air cleaner (if equipped), humidifier (if equipped), spark ignitor and the gas valve
• 100% lockout safety feature
• Monitors timing, trial for ignition, vent pressure switch, limit switches (main and over-temperature switches in series), flame sensing and lockout
• Compatible with LP or natural gas
• LED indication for status and fault codes to aid in troubleshooting
• Replaces: Rheum 62-24140-04

INTRODUCTION

The ICM292A DSI gas ignition control replaces the following Rheum model: 6224140-04. The ICM292A 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.

SPECIFICATIONS

• Line voltage: 115 VAC, 60 Hz
• Control voltage: 18-30 VAC, 60 Hz
• Power consumption: 0.3A plus gas valve current@ 24 VAC
• Operating temperature: -40°C (-40°F) to 75°C (176°F)

OUTPUTS

• Gas valve: 3A Pilot Duty @ 24 VAC
• Draft inducer motor: 3A max., 1/6HP @ 125 VAC
• Cool blower speed: 16A max., 1/2HP @ 277 VAC
• Heat blower speed: 14A max., 1/2HP @ 277 VAC
• Fan blower speed: 12A max., 1 HP @ 125 VAC
• Heat/cool single-speed: 10 A max., 1/2 HP @ 277 VAC
• Electronic Air Cleaner: 10 A max., 1HP @ 125 VAC
• Humidifier: 11 A max., 1/6HP @ 125 VAC

LED INDICATORS

• Power, green LED: PWR
• Status, green LED: OK
• Flame status, yellow LED: FLAME

TIMING

• Pre-purge: 30 seconds
• Trial for ignition: 7 seconds
• Retries: Two groups of two: 1st trial, 30 seconds delay, 2nd trial. 3 minutes delay. 3rd trial, 30 seconds delay, 4th trial. Lockout.
• Lockout: 1 hour
• Heat blower ON delay: 20 seconds
• Post-purge: 10 seconds
• Heat blower OFF delay: Toggle switches SW1 and SW2

OPERATION

A W call from the thermostat engages the Inducer Draft motor, provided that the system safety switches (Main and Over-temperature switches in series) are closed. The Vent Pressure switch closes. After a 30 second pre-purge, gas valve and spark are engaged. The ignitor turns off after flame is sensed or at the end of the trial for ignition, whichever comes first. If flame is not sensed, the board performs a retry. When flame is sensed, previous retries are cleared. After the Heat blower On-delay, the Blower motor engages at HEAT speed. When W call is satisfied, the gas valve is turned off. The Inducer motor turns off after 10 seconds and Blower motor turns off according to Heat Blower Off-delay setting.
A G call from the thermostat will engage Blower motor without delay at FAN speed. It disengages without delay when G call is removed. A Y call from the thermostat will engage Blower motor without delay at COOL speed. It disengages 45 seconds after Y call is satisfied.

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS

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 shuffle 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!
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.

REMOVE EXISTING CONTROL

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, fire, death, or personal injury.

4. Remove furnace blower and control access doors.

5. Disconnect thermostat wires and humidifier wires (if equipped with a humidifier).

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 humidifiers, evaporator coils, and vent systems in the area of the control.

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.

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.

LED FAULT CODES

LOCKOUT

The control will enter a 1-hour lockout if:

1. The Gas Valve is sensed on when it should not be.
2. Flame is sensed out of sequence.
3. Flame is not sensed during 4 consecutive trials for ignition.
4. Flame is lost after successful ignition 5 times in one W call.
   Note: All lockout types can be cleared by cycling power to the board. Ignition lockouts can also be cleared by cycling the W call.

WIRING DIAGRAM

Twin Function
Twinning functionality allows for simultaneous operation of two furnaces that are: installed side-by-side, connected by a common duct system, supplied main power by the same source, and controlled by a common thermostat. Twinning can be accomplished with two “ICM292A” integrated control boards by implementing the following procedure:

1. Ensure that both furnace control boards have the same part number.
2. Put the transformers of each furnace in-phase by wiring the commons of both transformers together and then connecting the commons to earth ground.
3. Use a wire to connect the “TWIN” terminals of the two furnace control boards.

Note: The “OK” LED will blink five times during a W call if twinning is not set up properly.

LEGEND

9-PIN CONNECTION

1. N/A
2. 24 VAC common
3. Limit switch In
4. Gas valve
5. Pressure switch out
6. Pressure switch in
7. Flame sensor
8. Limit switch out
9. 24 VAC common

TROUBLESHOOTING TIPS

Weak or intermittent spark : Make sure the furnace frame is grounded to earth ground.
Ensure that the 24 VAC common is grounded to Earth ground. Check or replace the spark igniter. Check the primary and secondary voltage of the transformer for proper voltage.
Flame Loss: Check, clean, or replace the flame sensor. Check pressure switch.
No flame/Ignition failure: Ensure that the 24 VAC common is grounded to Earth ground. Check, clean, or replace the flame sensor. Check or replace the spark igniter. Flame out of sequence: Flame out of sequence represents a scenario where flame is sensed while the gas valve is closed. The control enters lockout.
No ignition, main blower runs continuously: Check the high temperature limit switch for open circuit. Check all safeties. Clean or replace air filter. Check duct work and return air ducts for blockages.

CONNECTION DIAGRAM

INSTALLATION, OPERATION & APPLICATION GUIDE
For more information on our complete range of American-made products –
plus wiring diagrams, troubleshooting tips and more, visit us at www.icmcontrols.com
7313 William Barry Blvd., North Syracuse, NY 13212
www.icmcontrols.com

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