Key Benefits for HVAC Professionals Precise Thermal Calibration: Factory-set 175°F Open and 145°F Close thresholds for exact system protection

and light oil systems

Always use a backup wrench when tightening to prevent stress on the copper piping

When diagnosing heat pump defrost issues

Lochinvar & A.O. Smith 100166156 Pressure Switch Freon Key Benefits for HVAC ProfessionalsThe Lochinvar and A. O. Smith 100166156 Air Pressure Switch is a critical safety component designed for precise differential pressure sensing in high efficiency water heaters and boilers. This switch, which is identical to PRS2405, monitors the venting system to ensure the combustion blower is moving sufficient air for safe operation before the ignition sequence begins. Built to handle low positive or negative pressure fluctuations, it prevents short