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or dual fuel HVAC systems
316155A is identical to 316155A/U
this assembly features a normally open (NO) configuration with a 4
providing modern digital logic and improved status monitoring
Lennox 18M63 Pressure Switch 321042-401 or dual fuel HVAC systemsThe 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
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