Reznor 123974 Fan Switch Els PW 17895 While sized for up to

While sized for up to 5 tons

this specific model is designed for a 1"-14 thread

Can I use this on an HFK series balanced port valve

Is the Armstrong A21958-1 compatible with all B-Series traps

Reznor 123974 Fan Switch Els PW 17895 While sized for up 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