This direct-acting thermostatic valve features a precise temperature adjustment range from 70°F to 160°F (21°C to 71°C) and utilizes a 1

000 BTU Forsaire Counterflow Top Vent Furnaces

which can lead to delayed ignition or hot spots on the heat exchanger

While cleaning with a light abrasive can temporarily resolve flame detection issues caused by carbon buildup

leading to erratic damper or valve positioning

McDonnell & Miller FS4-3 Switch Refrigerant This direct-acting thermostatic valve featuresFor contractors requiring reliable system protection, the McDonnell & Miller FS4 3 (Part Number 114400) is a heavy duty general purpose liquid flow switch designed to monitor flow in heating, cooling, and water process lines. This 1" NPT unit features a single pole, double throw (SPDT) configuration, allowing you to easily integrate signal lights, alarms, motors, or burners into the control circuit. Engineered to operate at a max pressure of 160 PSI