ICM Controls ICM2916 Installation, Operation & Application Manual

Gas Ignition Replacement Board
Installation, Operation & Application Guide
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• 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 safety

SPECIFICATIONS

• Line voltage: 240 VAC
• Line frequency: 50/60 Hz
• Control voltage: 18-30 VAC
• Hi-efficiency blower: 10 mA @ 24 VAC
• Inducer blower: 0.7 FLA, 1.5 LRA @ 240 VAC
• Combined gas valve load: 1.5 A @ 24 VAC
• Minimum flame signal threshold: 0.75 uA
Flashes Fault Condition
Internal Control Board error
Solid RED
Continuous reset
Solid RED w/Solid Status LED
Lockout
2
Pressure switch or Inducer error
3
Open limit switch
4
False Flame
5
Not used
6
External Gas valve circuit error
7
Low flame sense
8
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 call
• 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).
ICM2916

FEATURES

INTRODUCTION

FAULT CODES, STATUS LIGHTS AND TROUBLESHOOTING

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.
• 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 ignition
period, 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 compressor
is de-energized and the jumper selected cool Off delay period begins. Following the cooling Off delay
period, the circulator fan is de-energized.
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! 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.
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.
TRANE P/N #: D674712P02
Trouble Shooting
Internal board failure, replace control board
Reset caused by internal board failure, replace the control board
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 earthground.
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.
Check for blocked airflow, blocked ductwork, and dirty filter. Check or replace high limit switch if
defective.
Flame was sensed when no flame is present. Check or replace flame sensor and check the grounds.
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.
A multimeter can be used to test flame sense by placing the meters probes on the two test pins and taking a DC voltage reading
while the flame sensor is in the presence of flame. 1VDC = 1µA flame current. Weak or poor flame sense is represented by a
reading of 0.7 VDC or lower.

LOCK OUT CONDITION

OPERATION

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REMOVE EXISTING CONTROL

INSTALL NEW CONTROL

REPLACES