ICM CONTROLS ICM2909 Direct Spark Ignition DSI Control Board Instruction Manual

: June 13, 2024
: ICM CONTROLS

Table of Contents

ICM CONTROLS ICM2909 Direct Spark Ignition DSI Control Board
Features
Introduction
Specifications
Remove Existing Control
Sequence of Operation
Flame Sense Troubleshooting Tips
Fault Codes
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ICM CONTROLS ICM2909 Direct Spark Ignition DSI Control Board

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

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.

Replaces
Rheem: 62-23599(-01,-02,-03,-04,-05)

Specifications

Inputs

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 VAC

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”

CAUTION

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.

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.

Turn thermostat to the OFF position or set it to the lowest possible setting.
Turn OFF the electrical supply to furnace.
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.
Remove the furnace blower and control access doors.
Disconnect the thermostat wires and humidifier wires (if equipped with a humidifier).
Disconnect the line voltage, blower, electronic air cleaner wires (if equipped) and transformer wires.
Remove screws and any other fasteners and the old circuit board.
Examine the control and the control box for water stains.
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

Ground yourself. When handling the circuit board; hold it by the edges.
Fasten the circuit board with the retaining screws.
Connect all line voltage, low voltage and accessory wires.
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.

Flame Sense Troubleshooting Tips

Flame not established

If flame is not established during the 7 second initial sequence then the control will start the next trial for ignition in 60 seconds.
There will be 2 more attempts to ignite, 60 seconds apart before the respective fault code is triggered and ignition trials are stopped.
The gas valve is energized only during the ignition sequence of 7 seconds.
The blower motor is off until 30 seconds after flame is established.

Flame out

Flame out is considered when flame is lost during the heating cycle.
When a signal is present on W and flame is not sensed; the gas valve will disengage until the next trial for ignition
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

Flame out of sequence represents a scenario where flame is sensed while the W signal is not present.
Inducer and Blower motors will be engaged (if not already running) and will continue running for as long as the fault condition is present.
There is 60 minute lockout before a W call can be executed or on power reset

Flashes	Fault Condition	Trouble Shooting
ON solid	Normal operation	Normal
OFF	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 gas valve is wired correctly and grounded properly.
1| Flame loss or ignition failure lockout| Flame was lost or the number of terry’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 earth round
2| Pressure switch stuck open or stuck closed| 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.
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

Molex Plug Pin Out

Pin 1 Limit switch input
Pin 2 24 VAC COM
Pin 3 Gas valve output
Pin 4 Limit switch output
Pin 5 Pressure switch input
Pin 6 Pressure switch output
Pin 7 MRLC (Manual Reset Limit Control) input
Pin 8 MRLC (Manual Reset Limit Control) output
Pin 9 Flame sense

Fault Codes

Flashes	Fault Condition
ON	Normal operation
OFF	No power or incorrect gas valve wiring
1	Flame loss or ignition failure lockout
2	Pressure switch stuck open or stuck closed
3	Limit switch open
4	Flame detected with gas valve closed
5	MRLC (Manual Reset Limit Control) open
6	Internal Error