Carrier 38CQ660029 Defrost Relay 321702-401 High-Temperature Durability: Constructed with materials

High-Temperature Durability: Constructed with materials rated for high-ambient combustion chamber environments to prevent structural warping

Functionally identical to the Honeywell ST9103A1069

or 240V) and purchase a compatible AM or ASC2 coil separately

ensuring optimal evaporator efficiency and compressor protection

This switch is typically calibrated for high-pressure cut-out

Carrier 38CQ660029 Defrost Relay 321702-401 High-Temperature Durability: Constructed with materialsThe 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