ICM Controls ICM255 Control

The ICM255 is a high-performance dual-function fan delay timer engineered to provide precise blower control in heat pump, air conditioning, and forced-air systems. This solid-state ICM Controls board features a fixed 1-second ON delay, ensuring the heat exchanger or evaporator coil reaches optimal temperature before the blower engages, preventing cold drafts or sluggish cooling at startup. Utilizing post-purge fan delay logic, the ICM255 keeps the blower energized for a fixed 60-second OFF delay (often cited as up to 180 seconds in specific legacy configurations like the 1/180-second variant) to maximize thermal efficiency by purging residual air from the ductwork.

Designed as a rugged HVAC blower control replacement, this open-board module handles high-power applications with a relay output rated at 20 Amps at 240 VAC. It is the direct cross-reference for the Snyder General 1395336, ICM255C, Mars 32574, A-1 5893, and 5896. The integrated interrogation delay prevents nuisance trips caused by thermostat bounce, making it a reliable choice for field service technicians looking for a universal 24V fan timer board that supports both N.O. and N.C. output configurations.

• Universal Cross-Reference: Directly replaces 1395336, ICM255C, 5893, and 5896, reducing truck stock requirements.
• High-Power Relay: Rated for 20A at 240 VAC, making it suitable for heavy-duty circulating fan control.
• System Efficiency: Forced post-purge fan delay extracts all conditioned air from the ducts after the call for heat or cool ends.
• Quick Installation: Compact 2.5" x 2.5" open board design with standard 1/4" quick-connect terminals for rapid field wiring.
• Operational Stability: Built-in 1-second interrogation delay filters out erratic thermostat signals and bounce.

What systems is the ICM255 compatible with?
It is designed for any system utilizing 18-30 VAC control voltage, specifically forced-air furnaces, heat pumps, and central air conditioning units where fan blower control is required.

Can I use this to replace a thermal time delay?
Yes, the ICM255 is a common electronic upgrade for older thermal fan delays, providing more consistent timing functions and higher amperage handling.

Does it require a continuous power source?
Yes, for the OFF delay (purge) function to operate correctly, input power must be applied to the board before and during the timing period.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.