Reznor 201159 Pressure Switch

The Reznor 201159 Pressure Switch is a critical OEM safety component engineered for precise combustion airflow monitoring in high-capacity gas-fired unit heaters. Calibrated to a specific 1.40" WC (Water Column) set point, this SPST (Single Pole Single Throw) switch ensures the inducer motor maintains the necessary static pressure for safe flue gas venting before ignition. Featuring dual 1/4" barb connections for secure pneumatic tubing attachment, this high-altitude rated switch is a standard service part for older Reznor UDAP, UDAS, UDBP, and UDBS series units, particularly models 350 and 400 manufactured before July 2009. As a veteran-grade HVAC replacement part, it replaces discontinued Honeywell and legacy Nortek controls, providing reliable differential pressure sensing to prevent burner operation during blocked vent or motor failure conditions. The robust housing and factory-set calibration facilitate rapid field installation, ensuring your commercial heating equipment meets original venting safety specifications.

• Precise Safety Calibration: Factory-preset at 1.40" WC to ensure the system only fires under optimal vacuum conditions.
• OEM Compatibility: Specifically designed for Reznor UDAP350, UDAP400, and related high-output units.
• Enhanced Connectivity: Dual 1/4" barb connections provide a leak-resistant interface with sensing tubes.
• Reliable Switching: SPST configuration delivers dependable electrical continuity for the furnace control board.
• High Altitude Performance: Engineered to maintain accuracy in varied atmospheric conditions common in high-altitude installs.

Common Questions

What happens if the 1.40" WC pressure is not met?
If the inducer motor fails to pull a vacuum of at least 1.40" WC, the SPST switch will remain open, preventing the ignition sequence as a primary safety measure against carbon monoxide buildup.

Can this replace a pressure switch with a different WC rating?
No. For safety and sequence-of-operation accuracy, you must match the 1.40" WC rating of the original equipment. Using a lower rating may lead to unsafe operation, while a higher rating may cause nuisance trips.

Is this switch compatible with newer Reznor models?
This part is typically intended for units manufactured prior to July 23, 2009. Always verify your specific model and serial number against the Reznor 201159 technical documentation before installation.

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.