Product Description
The ICM CONTROLS 291 is a microprocessor-based direct spark ignition (DSI) control board, serving as a low-cost, functional replacement for Carrier LH33WP003A circuit boards. It manages the inducer fan motor, blower fan, limit switches, combustion, spark ignitor, and gas valve. Operating on 24 VAC control voltage and 208/230 VAC line voltage, it monitors timing, trial for ignition, flame sensing, and lockout, featuring a 100% lockout safety. Integrated LED diagnostics assist in troubleshooting fault codes.
- Low-cost form, fit and functional replacement board for Carrier: LH33WP003A circuit boards
- Controls inducer fan motor, blower fan and monitors limit switches
- Incorporated LED diagnostics to assist in troubleshooting
Product Highlights
Microprocessor-based DSI control board with 100% lockout safety and LED diagnostics for Carrier LH33WP003A replacement.
Product Information
Standard Information
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Brand: ICM CONTROLS
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Manufacturer Part Number: 291
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Country of Origin: United States
Technical Specifications
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Replaces: Carrier: LH33WP003, LH33WP003A; ICP: 1171166
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Control Voltage: 24 VAC (18-30 VAC), 60 Hz
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Line Voltage: 208/230 VAC, 60 Hz
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Pre-Purge Timing: 45 seconds
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Trial for Ignition Timing: 5+2 seconds
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Retry Period Timing: Every 20 seconds for 15 minutes
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Lockout Timing: Manual reset
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Post-Purge Timing: 45 seconds
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Red LED Indicator: Steady ON – Normal operation; Flashing – fault codes
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Power Inputs: RT and C
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Thermostat Interface Inputs: R, W, and G
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Safety Switches Inputs: RS, LS, and CS
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Combustion Motor Input: Hall Effect Sensor
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Flame Sensing Input: Yes
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Spark Output: Gas Valve (GV)
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Combustion Motor Output: CM
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Blower Motor Output: BM
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Indoor Fan Motor Output: IFO
