When replacing this combustion fan

and damper proving circuits

making it ideal for large residential split systems and heat pumps

How do I confirm the coil is properly energized

Lochinvar & A.O. Smith 100208448 Relief Valve R-22 When replacing this combustion fanThe Lochinvar & A. O. Smith 100208448 Relief Valve is a critical boiler and water heater safety component designed for precise overpressure protection. This heavy duty 1 inch NPT inlet valve features a 1 1 4 inch outlet and is factory calibrated to a 50 PSI set pressure. Engineered for high recovery commercial and residential hydronic systems, it effectively prevents vessel failure by automatically discharging excess pressure when system limits are