or 3 to 3 on connectors J1 and J2 and find values outside the 150K ohm (+/- 1

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

scorched internal seals from over-heating during brazing

the sensor resistance may be drifting out of spec

For technicians servicing Carrier 40RM fan coils

Lennox 18M63 Pressure Switch 320735-701 or 3 to 3 onThe 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