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it is standard practice to install gas shutoff valves with the solenoid upright to prevent debris accumulation in the core tube
providing superior thermal protection and electrical stability in high-ambient environments
preventing common overheating issues associated with generic aftermarket alternatives
this unit features a Manual Reset mechanism and a Single Pole Double Throw (SPDT) switch configuration
Features OEM compatibility with legacy Lennox and Allied Air models
Reznor 123974 Fan Switch 30067439-890 it is standard practice toThe 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
US$ 2119.50
US$ 115.00