and Janitrol gas furnaces and packaged units

the electrical contacts are rated for both 120V and 230V AC applications common in central heating systems

Dual-temperature applications typically require the T-4000-611 variant

ensuring high-sensitivity resistance changes of 2

the switch opens the safety circuit

Nordyne 632451R Pressure Switch and Janitrol gas furnaces andThe Nordyne 632451R Pressure Switch is a critical safety component designed for precise draft monitoring in high efficiency gas furnaces. Set at . 90" WC, this Single Pole Single Throw (SPST) switch ensures the inducer motor is moving sufficient combustion air before the ignition sequence initiates. Engineered specifically for M3 furnace series and compatible with brands like Intertherm, Miller, and Frigidaire, this furnace air pressure switch