LIAF299
ICM
2909
Direct Spark Ignition (DSI) control board
Electrostatic Discharge (ESD) Precautions
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 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 the
used and new controls in separate; containers before touching ungrounded objects.
6. ESD damage can also be prevented by using an ESD service kit.
Features
Direct Spark Ignition (DSI) control board
Microprocessor-based
Monitors timing, trial for ignition, system switches, flame sensing and
lockout.
100% lockout safety feature
Compatible with LP or Natural Gas
LED indication for status and fault codes to aid in troubleshooting
Specifications
Replaces
• Rheem: 62-23599(-01,-02,-03,-04,-05)
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.
> > > CAUTION < < <
Introduction
The 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. Fault
code information can be found in this application guide. Please keep this application guide
with the furnace installation manual for future reference.
Remove Existing 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.
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) 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,
evaporator coils and vent systems in the area of the control.
Install New 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. Verify the sequence of operation.
Sequence of Operation
When a W call is received from the thermostat; the control shall perform a hardware safety
check before progressing with the heat sequence. If no issues are detected during the
hardware safety check; the Inducer Draft motor is energized. The Vent Pressure switch
closes. Ignition sequence begins; gas valve and spark are engaged, providing the system
safety switches (Limit and MRLC) are closed. The Blower motor will engage at the HEAT
speed 30 seconds after flame is established and sensed. Once the W call has been
satisfied; the Inducer motor turns off after 5 seconds and the blower motor turns off after 90
seconds.
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 COOL
speed. It disengages 30 seconds after the Y call is satisfied.
Troubleshooting Tips
Flame not established
1. If flame is not established during the 7 second initial sequence then the control will start
the next trial for ignition in 60 seconds.
2. There will be 2 more attempts to ignite, 60 seconds apart before the respective fault
code 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 out
1. 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 disengage
until the next trial for ignition
3. The inducer motor will continue running during flame out scenario and the blower motor
will turn off after the 90 second post purge.
Flame out of sequence
1. Flame out of sequence represents a scenario where flame is sensed while the W signal
is not present.
2. Inducer and Blower motors will be engaged (if not already running) and will continue
running 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 reset
Inputs
• Line voltage:
208-230 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/30 LRA @ 277 VAC, 30K @ 85°C
• Cool N.O.:
15FLA/36 LRA @ 277 VAC, 100K @ 85°C
• Inducer:
9.8FLA/58.8LRA, 1/2HP @ 120 VAC, 6K @ 75°C
• Gas valve:
2.3 A PILOT DUTY @ 240 VAC, 6K @ 75°C
Heat Operation
• Pre-purge:
3 seconds
• Heat blower ON delay:
30 seconds
• Post-purge:
5 seconds
• Heat blower OFF delay:
90 seconds
• Ignition trial:
7 seconds
• Inter-purge (retrial):
15 seconds
• Ignition activation period:
5 seconds
• Flame establishing period:
2 seconds
• Flame failure response time:
0.8 seconds (maximum)
Fan Operation
• Heat blower ON:
1 second
• Heat Blower OFF:
1 second
Cooling Operation
• Cool blower ON delay:
1 second
• Cool blower OFF delay:
30 seconds
Lockout Timing
• Auto reset lockout:
60 minutes
Environmental
• 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”
