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Common Questions Is the J993MDA-2 compatible with LP gas systems
including specific Reznor unit heaters
making it suitable for installation in VAV terminal units and air handling spaces without additional conduit in many jurisdictions
while exceeding the rating can cause excessive winding current and premature motor failure
Reznor 123974 Fan Switch Els PW 17895 Common Questions Is the J993MDA-2The 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