Lochinvar & A.O. Smith 100166220 Pressure Switch

The Lochinvar & A.O. Smith 100166220 is a high-precision air pressure switch designed for critical safety monitoring in commercial and residential HVAC systems. Engineered to function as a Single Pole Single Throw (SPST) switch, this component features a fixed set point of .10" WC (Water Column). It is essential for verifying proper induction draft and airflow before allowing the ignition sequence to proceed in high-efficiency boilers and water heaters. This genuine OEM part is technically identical to the Lochinvar PRS30000, ensuring seamless replacement compatibility for technicians servicing A.O. Smith and Lochinvar units. By accurately sensing differential pressure, the 100166220 pressure switch prevents hazardous conditions caused by venting obstructions or blower failure. Its robust construction is tailored for the demanding environments of boiler rooms, maintaining set point integrity and electrical continuity throughout heavy cycling. For professional contractors, this is the standard 0.10 inch WC SPST solution for maintaining unit reliability and code compliance during routine maintenance or emergency repair calls.

Key Benefits

• Universal Compatibility: Serves as a direct-drop replacement for both 100166220 and PRS30000 part numbers, minimizing truck stock requirements.
• Precise Safety Actuation: Calibrated at .10" WC to ensure the system only fires under optimal venting conditions.
• Reliable SPST Logic: Simplified Single Pole Single Throw design reduces potential points of failure within the control circuit.
• OEM Engineering: Manufactured to the strict tolerances required by Lochinvar and A.O. Smith for safety-critical components.

Common Questions

Is the 100166220 pressure switch compatible with my Lochinvar Knight boiler?
Yes, the 100166220 is the standard pressure switch replacement for many Lochinvar models; however, always verify the specific WC (.10") rating on your existing switch before installation.

What is the difference between 100166220 and PRS30000?
There is no functional or technical difference. These parts are identical and interchangeable across A.O. Smith and Lochinvar equipment platforms.

Can I use an adjustable pressure switch to replace this 0.10" WC model?
It is highly recommended to use this fixed OEM pressure switch to ensure the factory-specified safety parameters of the HVAC system are maintained without the risk of manual calibration errors.

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.