and FS7-4W liquid flow switches

As an HVAC professional

the Maxitrol R9110-36 is the industry-standard plated spring designed specifically for RV91 and 210E series regulators

This OEM replacement part is the functional direct successor to the 20215702S

It will close the circuit once the sensor cools to 105 degrees F

Reznor 100799 Limit Control and FS7-4W liquid flow switchesThe Reznor 100799 Limit Control is a critical safety component designed for precise thermal regulation within Reznor unit heaters. This L150 25F high limit switch operates with a fixed temperature setpoint, featuring an open on rise configuration at 150F and a 25F differential for reset. Engineered for rapid response to heat exchanger over temperature conditions, this SPST limit switch ensures the burner circuit is interrupted if airflow is restricted