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Always verify the part number against your existing burner assembly or service manual to ensure the rod length and mounting bracket align
including specific Reznor unit heaters
Field Proven Durability: Standardized Johnson Controls pneumatic parts footprint for rapid retrofit or replacement
The Watts 0274934
Reznor 123974 Fan Switch Els PW 17895 Always verify the part numberThe Reznor 123974 Fan Switch is a precise thermal control engineered for gas fired unit heaters and duct furnaces. Designed to manage blower cycles based on internal heat exchanger temperatures, this F135 30F fan control ensures the fan engages when the plenum reaches 135F and terminates operation once it cools to 105F (30F differential). As a direct replacement for part 48706, it maintains the critical timing required to prevent heat exchanger stress