Description
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
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920338 defrost control printed-circuit board with factory-mounted harness connector
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Mounting bracket and hardware pack
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Quick-connect terminal pins and wire nuts
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Detailed installation and wiring instructions
Key Features
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Adaptive defrost algorithm adjusts cycle frequency based on run time and ambient conditions
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Configurable default timers (max defrost, minimum off, termination) via onboard jumpers
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LED status indicator for diagnostic modes and fault codes
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24 VAC control inputs for coil-sensor and air-temperature signals
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Outputs for hot-gas valve or reversing-valve coil activation
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Automatic sensor-open/short detection with fail-safe lockout
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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 |
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