ICM Controls ICM318C Heat Pump Defrost Control Board

The ICM318C Heat Pump Defrost Control Board by ICM Controls is designed to manage defrost cycles for efficient heat pump operation. This UL and CSA certified defrost control board comes in a compact 3.6" x 3.4" surface-mount package, ideal for tight installations and quick service.

Engineered for reliable, energy-conscious performance, the ICM318C supports 18–30 Volt AC power at 50/60 Hz, draws only about 1 watt, and provides flexible relay outputs to drive both the reversing solenoid and the outdoor fan. Its fixed 10-minute defrost time and pin-selectable 30/60/90 minute intervals help optimize cycling across climates while maintaining comfort and efficiency.

• Compact, surface-mount design with mounting options using four screws or plastic standoffs
• Voltage & power: 18–30 VAC @ 50/60 Hz; up to 1W
• Output configuration: 2 A @ 30 VAC DPST/NO relay (reversing solenoid valve/defrost relay coil); 1/2 HP @ 240 VAC SPST/NC relay (outdoor fan)
• Defrost timing: 10-minute fixed defrost; interval between defrosts selectable (30/60/90 minutes)
• Certifications: UL listed, CSA approved for safe operation