When performing a HVAC reversing valve replacement

How do I verify the fail-safe direction of the MP-475

Robust Construction: Features high-grade elastomers and stainless steel components for superior resistance to wear and environmental stress

or steam leaking from the diaphragm chamber's vent or bleed port

this coil allows for fast

Lochinvar & A.O. Smith 100109962 Switch 318820-201 When performing a HVAC reversingThe Lochinvar and A. O. Smith 100109962 Blower Prover Switch is a critical safety component designed to verify adequate airflow within the combustion chamber before ignition occurs. This differential pressure switch serves as the current OEM replacement part for legacy numbers 9004586215 and NS2 0097 00. When the inducer motor engages, this switch monitors the pressure drop across the venturi or heat exchanger, ensuring the system can safely vent flue