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Direct Fit Compatibility: Specifically engineered to replace the 5051-078BX
or 240V) and purchase a compatible AM or ASC2 coil separately
permitting flow when energized and providing a positive shut-off when de-energized to maintain system pressure
This switch is typically calibrated for high-pressure cut-out
Carrier 38CQ660029 Defrost Relay 321702-401 Direct Fit Compatibility: Specifically engineeredThe 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