User Guide
TROUBLESHOOTING
Symptom Remedy
Flame not established Check gas supply, pilot burner, spark and ame sense wiring, ame rod contaminated or not enveloped with ame, burner ground
connection.
Flame out If system fails to light during the trial for ignition, check gas supply, pilot burner, ame sense wiring, contamination of ame rod,
burner ground connection.
Flame out of sequence Check for pilot ame. Replace gas valve if pilot ame present. If no pilot ame, cycle “Call for Heat”. If error repeats, replace control.
ONE-YEAR LIMITED WARRANTY
The Seller warrants its products against defects in material or workmanship for a period of one
(1) year from the date of manufacture. The liability of the Seller is limited, at its option, to repair,
replace or issue a non-case credit for the purchase prices of the goods which are provided to
be defective. The warranty and remedies set forth herein do not apply to any goods or parts
thereof which have been subjected to misuse including any use or application in violation of
the Seller’s instructions, neglect, tampering, improper storage, incorrect installation or servicing
not performed by the Seller. In order to permit the Seller to properly administer the warranty,
the Buyer shall: 1) Notify the Seller promptly of any claim, submitting date code information or
any other pertinent data as requested by the Seller. 2) Permit the Seller to inspect and test the
product claimed to be defective. Items claimed to be defective and are determined by Seller
to be non-defective are subject to a $30.00 per hour inspection fee. This warranty constitutes
the Seller’s sole liability hereunder and is in lieu of any other warranty expressed, implied or
statutory. Unless otherwise stated in writing, Seller makes no warranty that the goods depicted
or described herein are t for any particular purpose.
7313WilliamBarryBlvd.,NorthSyracuse,NY13212
(TollFree) 800-365-5525 (Phone) 315-233-5266 (Fax) 315-233-5276
www.icmcontrols.com
WIRING DIAGRAMSICM2902 TYPICAL WIRING DIAGRAMS
• Main Burner Operation
When the main valve opens, gas flows to the main burner where it is lit by the pilot flame. There is a short flame stabilization period as the main
valve opens to allow the pilot flame to stabilize as the main gas lights. The system is now in the run mode with the presence of the pilot flame
continuously monitored by the flame rectification circuit. If the pilot flame goes out, the ignition control module senses loss of pilot flame and
shuts off both the pilot valve relay and the main valve relay. Flow of gas to pilot and main burner’s stops as the valves close (100% shutoff)
Failed Trial for Pilot Ignition
The ICM2905 control module provides a 60 minute Lockout delay if the pilot flame is not sensed within 2 minutes. The control will not try for igni-
tion again until the Lockout time of 60 minutes has expired.
LIAF241
Patented: 5,889,645; 5,917,691; 6,222,719; 5,930,104
ICM2905
TH
GND
(Burner)
24V GND
24V
Combination Gas
Valve
Burner
Ground
24 VAC
24 VAC
Common
L
1
L
2
Spark
Electrode
Flame Sense
Thermostat
M
M/P
P
Prepurge Time: 0 Seconds
Trial for Ignition: 2 Minutes
Lockout: 60 Minutes
RATINGS
• Input:
24 VAC, 50/60 Hz
• PV:
2 amp maximum
• MV:
2 amp maximum
Vent
Damper