Carrier 322848-751 Replacement Kit

The Carrier 322848-751 Replacement Kit is a critical OEM furnace control board upgrade designed for veteran HVAC technicians servicing older Carrier, Bryant, and Payne fan coil units. This comprehensive kit provides a direct path to modernize fan blower control board systems in FA4A, FB4A, and FC4B models manufactured prior to 1994. Engineered to replace obsolete HK61GA001 and HK61GA003 Texas Instruments boards, this assembly integrates a new HK61EA002 circuit board with a dedicated low-voltage barrier and wiring harness to ensure electrical isolation and reliable signal processing. The 322848-751 circuit board features a built-in 90-second blower-off delay to maximize sensible heat recovery and system efficiency during cooling cycles. It supports multi-tap blower motors with designated spade terminals for high (black), medium (blue), and low (red) speed configurations, protected by a 5-amp automotive-style fuse to prevent transformer damage during field wiring errors.

• Direct Compatibility: Engineered as the factory-authorized 322848-751 replacement for 319558-70101 and the HK61 series.
• Enhanced Control: Features an integrated fan delay-off relay and 12-pin Molex connectivity for seamless harness integration.
• Full Assembly: Includes the 321702-401 low voltage barrier and 322847-3R11 wiring harness for a clean, professional install.
• Safety Interlocks: Prevents auxiliary electric heat stages from energizing without confirmed blower operation.

What fan coil models are compatible with this kit?
This kit is the primary service solution for FA4A, FB4A, FC4B, 40YA, 40YR, 617A, and 618A fan coils. It replaces the original large-format TI boards with a mounting bracket and updated wiring logic.

How do I adjust the blower shut-off timing?
The board includes a standard 90-second delay. For applications requiring an immediate shut-off after a cooling call, technicians can cut the JW1 jumper wire on the circuit board.

Does this kit include a new transformer?
No, the kit utilizes the existing 24V transformer. Ensure the brown common (C) wire and red (R) wire are correctly oriented on the new spade terminals to protect the logic circuit.

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.