Self-Powered Operation: Relies on thermopile output to operate the gas solenoid

For technicians servicing Carrier 40RM fan coils

Simplifies the electrical upgrade process for technicians working on HVAC voltage modifications

Rugged Construction: Bronze body and stainless steel springs provide reliability in 200 PSI wet-heat applications

Lennox 18M63 Pressure Switch 320735-701 Self-Powered Operation: Relies on thermopileThe Lennox 18M63 Pressure Switch is a high precision, two stage OEM furnace part specifically engineered for compatible Lennox, Armstrong, and Ducane heating systems. This dual action component provides critical monitoring of combustion air pressure, ensuring the inducer fan maintains the proper venting required for safe ignition and continuous high efficiency operation. With fixed set points of 0. 20" WC and 0. 45" WC, this switch accurately