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Direct Swap Compatibility: Engineered as a drop-in replacement head mechanism for McDonnell & Miller Series 93 and 193 controls
ensuring optimal evaporator efficiency and compressor protection
Direct Fit Compatibility: Specifically engineered to replace the 5051-078BX
Functionally identical to the Honeywell ST9103A1069
Carrier 38CQ660029 Defrost Relay 321702-401 Direct Swap Compatibility: Engineered asThe Carrier 38CQ660029 Defrost Relay is a specialized HVAC defrost control board designed for heat pump systems requiring precise field selectable timing. This genuine OEM replacement part manages the transition between heating and defrost modes by monitoring the defrost thermostat and cumulative compressor run time. Engineered for 208 240V configurations, the board supports a 10A current capacity and features adjustable intervals of 30, 45, or 90
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