902987 Nordyne 4-7 wire A/C - H/P relay kit

🔌 Product Overview

• Part Number: 902987

• Type: A/C – H/P Relay Box

• Function: Allows connection of 2-wire and 4–7 wire thermostats to Nordyne electric furnaces when adding A/C or heat pump

• Includes:

  • Circuit board

  • Adapter harnesses

  • Mounting brackets

• Dimensions: ~6.5″ × 4″ × 1.5″

• Weight: ~2.82 lbs

• Package Size: 10″ × 12″ × 12″

• Vendor: Nordyne

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This relay box acts as a bridge between the thermostat and furnace control board, enabling staged cooling and reversing valve control for heat pump systems.

✅ Compatibility

The 902987 relay box is used when retrofitting or upgrading Nordyne electric furnaces that were not originally equipped for A/C or heat pump operation:

Also compatible with Intertherm, Miller, and other Nordyne-manufactured mobile home electric furnaces.

🛠️ Installation Notes

• Required when upgrading from basic 2-wire thermostats to multi-stage cooling or heat pump setups

• Includes all necessary wiring adapters and mounting hardware

• Ideal for technician kits servicing mobile home electric furnaces with A/C or H/P retrofits 

2 wire and 4-7 wire control box package used when adding a/c or a heat pump to a Nordyne E1EH, E2EH, E1EB, E2EB & E2BH electric furnaces that are not already a/c equipped. Also found on many M1 furnaces. For a replacement circuit board, order part number 624625. This will replace the obsolete 2-wire control box 902986 including control board 624567. When replacing a 2-wire system, you will need to order a 903992 4-5 wire thermostat. If you only have 2 thermostat wires running from the furnace to the thermostat, you will need to update that with a 4-7 wire cable. Box contains a circuit board and a variety of adapter harnesses. Includes mounting brackets. Box measures approximately 6.5" x 4" x 1.5".

Info sheet

Replaces 703110, 902798, 902986 & possibly others.