this is an auto reset thermal switch

Key Benefits for Technicians Precise Calibration: Factory-set at 0

270 in-lb Torque Output: Provides reliable automation for oversized dampers and high-pressure air systems

making it suitable for protected outdoor use

When troubleshooting vibration issues or reduced airflow in Reznor heaters

Carrier HH18HA282 Thermostat/Sensor 318423-701 this is an auto resetThe Carrier HH18HA282 is a high precision defrost thermostat sensor engineered for Carrier, Bryant, and Payne heat pump systems. This OEM replacement part, also identified by manufacturer number 3NT01L 04002, is a critical tube mount sensor designed to monitor evaporator coil temperatures. Operating on an L80 50 logic, the switch is calibrated to open at 80F and close at 30F, ensuring the defrost cycle triggers only when frost accumulation threatens