Lochinvar & A.O. Smith 100166145 Pressure Switch

The Lochinvar and A.O. Smith 100166145 Pressure Switch is a critical safety component designed for precise low gas pressure monitoring in high-efficiency commercial boilers and water heaters. Engineered to meet the rigorous demands of HVACR systems, this manual reset (M/R) switch operates within a 2-14" W.C. (water column) range, ensuring the burner circuit interrupts if supply pressure drops below safe operational thresholds. Cross-referenced as PRS2044, this component is frequently found in Lochinvar Knight and A.O. Smith Cyclone models. Integrating this OEM replacement pressure switch ensures the combustion process maintains the correct fuel-to-air ratio, preventing flame instability and potential equipment damage. Its robust construction facilitates accurate setpoint calibration for gas pressure regulation, providing technicians with a reliable solution for maintaining system safety standards and combustion efficiency in the field.

Key Benefits

• Broad Compatibility: Direct replacement for PRS2044, compatible with multiple A.O. Smith and Lochinvar commercial applications.
• Safety Compliance: Manual reset functionality prevents automatic cycling under low-pressure conditions, protecting the heat exchanger.
• Precise Tolerance: Calibrated for 2-14" W.C. to handle varying inlet gas pressure requirements.
• Industrial Build: Built to withstand the high-temperature environment of a boiler burner assembly.

Common Questions

Is the 100166145 a direct replacement for the old PRS2044?
Yes, the 100166145 is the updated part number and is functionally identical to the PRS2044 pressure switch.

When should a manual reset low gas pressure switch be replaced?
Replacement is necessary if the switch fails to maintain continuity when pressure is within the 2-14" W.C. range or if the manual reset fails to engage after a trip event.

What causes this switch to trip frequently on commercial boilers?
Frequent trips usually indicate a gas supply pressure drop, a clogged sediment trap, or an undersized gas regulator failing to meet the BTU demand of the appliance.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.