The Lennox 89M74 uses industry-standard markings: connect the compressor lead to the HERM terminal

Key Benefits for Technicians: Precision Fitment: Pre-cut to 22-3/4 inches with 1/8-inch outer diameter for direct compatibility with Weil-McLain boiler models

requiring only a straightedge and calipers for accurate setup

it is standard practice to mount these relays in a position that allows easy access to the bias adjustment and prevents moisture accumulation in the ports

the contacts are designed for a close-on-fall action

York S1-024-35276-000 Pressure Switch Els PW 17895 The Lennox 89M74 uses industry-standardThe York S1 024 35276 000 Pressure Switch is a critical safety component designed for precise pressure monitoring in PT8 2 Stage Downflow Horizontal Natural Gas Furnaces. This SPNO Pressure Switch (Single Pole Normally Open) is engineered to sense the static pressure generated by the inducer motor, ensuring that the exhaust path is clear and the combustion blower is performing at a sufficient RPM before allowing the ignition sequence to proceed. As a