920338 Nordyne DEFROST BOARD Product Description The 920338 defrost control board is the OEM adaptive defrost module for Nordyne and compatible heat-pump condensing units. It monitors outdoor coil temperature via a sensing input, applies timed or sensor-driven defrost cycles, and drives the hot-gas solenoid or reversing valve to clear frost buildup. Housed in a sealed enclosure with quick-connect terminals and an integrated mounting bracket, it includes on-board diagnostics and configurable timers to optimize energy use and ensure safe operation. Kit Contents 920338 defrost control printed-circuit board with factory-mounted harness connector Mounting bracket and hardware pack Quick-connect terminal pins and wire nuts Detailed installation and wiring instructions Key Features Adaptive defrost algorithm adjusts cycle frequency based on run time and ambient conditions Configurable default timers (max defrost, minimum off, termination) via onboard jumpers LED status indicator for diagnostic modes and fault codes 24 VAC control inputs for coil-sensor and air-temperature signals Outputs for hot-gas valve or reversing-valve coil activation Automatic sensor-open/short detection with fail-safe lockout Sealed enclosure rated NEMA 1 for indoor control-compartment mounting Compatibility Fits Nordyne, Coleman, Concord, Ducane, and Intertherm heat-pump condensing units originally equipped with a 920338 or equivalent defrost board. Always verify existing board part number, harness style, and sensor wiring before ordering. Condenser Model Series Capacity (Tons) Notes G6MB030B 14 SEER 2.5 Upflow / horizontal, R-410A G6MB036B 14 SEER 3.0 Multi-position, R-410A G6MP048C Multi-Position 4.0 R-410A, adaptive defrost ready G9RP050A Multi-Position 4.2 R-410A, heat-pump with hot-gas defrost B9RP060A1 Multi-Position 5.0 R-410A, factory reversing-valve defrost C9RP060A (Coleman) Multi-Position 5.0 OEM equivalent E8LP048A1 (Intertherm) Horizontal 4.0 R-22 / R-410A switchable F9RP072B1 (Ducane) Downflow 6.0 R-410A, differential-sense defrost
