Direct Spark Ignition Control, 120v w/ 5 sec. Prepurge (4 sec TFI), Replaces Fenwal 35-725201-501

The ICM2910 consists of a series of 11 Fenwal OEM Replacement DSI Controls. When the thermostat initiates a "Call for Heat", the ICM2910 will perform a hardware check. After the hardware check, the ICM2910 will start a pre-purge where applicable. Once the pre-purge has ended, the spark source and the gas valve relay are energized simultaneously for the duration of the trial for ignition period. A flame rectification circuit confirms the presence of the flame. Upon flame detection, the spark source is turned off. If flame is not sensed, the control will turn off the spark source and gas valve and start an inter-purge where applicable before the next trial for ignition. If flame is not detected after the trial(s) for ignition, the control will enter a hard lockout. To clear the hard lockout, remove the input voltage to the control or recycle the thermostat’s heat call.

Product Features

• Direct Spark Ignition (DSI) control modules
• Microprocessor-based
• Controls spark ignitor and gas valve
• Monitors timing, trial for ignition, flame sensing and lockout
• Compatible with LP or natural gas
• Redundant Gas valve design conforms to ANSI Z21.20

Specifications

• Control Voltage: 102-138 VAC
• Flame Current: 1uA minimum
• Current Draw: 50mA maximum
• Gas Valve: 1.5A, 120 VAC
• Flame Failure Response Time: 0.8 seconds maximum
• Operating temperature: -40°F to 175°F