How do I test this flame sensor in the field

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

What is the specific drill size for this York orifice

requiring only a straightedge and calipers for accurate setup

0A resistive loads at 240VAC and supports inductive motor loads (up to 7

York S1-024-35276-000 Pressure Switch Els PW 17895 How do I test thisThe 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