For heating applications that require the valve to close on a temperature rise

utilizing a 25°F fixed high-limit differential to prevent short-cycling

though it can be hardwired to the system’s 24V power for continuous operation

Rugged construction and high-quality terminals withstand continuous high-temperature cycling

or moisture buildup in the vacuum tubing

Nordyne 624838R Temperature Sensor 321894-709 For heating applications that requireThe Nordyne 624838R is the official OEM coil temperature sensor, serving as the direct replacement for the legacy part number 624838. Engineered for precise thermal monitoring in Nordyne heat pumps and air conditioning units, this thermistor provides critical data to the control board to manage defrost cycles and prevent evaporator freeze ups. Maintaining accurate HVAC coil temperature readings is essential for system protection and operational