the ST-D24 thermistor ensures tighter setpoint control and improved system efficiency across various air handling unit (AHU) configurations

This model is constructed from lead-free materials to comply with federal regulations for potable water systems

the 1320364 offers a direct-fit solution that maintains the internal safety string integrity without the calibration drift often found in generic aftermarket controls

For refrigeration systems running R404A or R507

Lennox 66J78 Limit Switch Els PW 17895 the ST-D24 thermistor ensures tighterExperienced HVAC contractors recognize the Lennox 66J78 Limit Switch as a critical safety component for maintaining furnace integrity and preventing heat exchanger damage. This OEM Lennox replacement part is a 36T series disc style control designed for High Limit or Secondary Rollout applications. It features a Normally Closed (NC) circuit that opens on temperature rise to interrupt the heating cycle if internal temperatures exceed safe operating