Rcd hk38ea004 Defrost Control Relay

Product Description

The RCD hk38ea004 is a defrost control relay designed for use in residential and light commercial HVAC systems. This relay serves as a switching component within the defrost control circuit, signaling the system to initiate or terminate defrost cycles on heat pump and central air conditioning equipment. Licensed HVAC technicians install this part as a direct replacement when defrost control failures result in ice accumulation on the outdoor coil or improper defrost cycle operation. The hk38ea004 is sourced from RCD and is built to match OEM electrical and mechanical specifications for the applications it serves.

This relay is used in heat pump systems where reliable defrost cycle control is essential to maintaining system efficiency and protecting the outdoor coil. It is typically found in the defrost control board assembly or mounted in the control compartment of the outdoor unit. Technicians working on residential split-system heat pumps will encounter this relay when diagnosing defrost faults, stuck relays, or control board failures where the relay is the failed component rather than the full board assembly.

Key Features

• Functions as a defrost control relay for heat pump and central air systems
• Designed to match OEM electrical specifications for direct replacement
• Fits within defrost control board assemblies or standalone relay mounts
• Supports proper initiation and termination of defrost cycles

Compatibility

Designed as an OEM-style replacement defrost control relay for residential and light commercial heat pump systems where the hk38ea004 is the specified part.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out all power to the outdoor unit before accessing the control compartment or handling any relay components. Verify that the replacement relay matches the electrical ratings of the original before energizing the system. Follow applicable local codes and manufacturer wiring diagrams when reconnecting the control circuit.

Technical Specifications

• Component Type: Defrost Control Relay
• Application: Heat Pump and Central Air HVAC Systems

Standard Information

• Brand: RCD
• Manufacturer Part Number: hk38ea004