Reznor 235953 Pressure Switch

The Reznor 235953 Pressure Switch is a critical safety component designed for precise airflow monitoring in industrial and commercial heating units. Rated at a 2.25 inch wc set point, this SPDT pressure switch ensures the combustion fan provides adequate drafting before allowing the gas valve to energize. Built with robust materials to withstand high-cycle operations in demanding environments, the 235953 serves as an OEM replacement for diverse HVAC applications, including air flow control in ventilation and combustion safety circuits. As a veteran-grade HVAC air pressure switch, it features high-accuracy sensing diaphragms to prevent hazardous firing conditions by detecting blocked flues or motor failures. Proper integration of this Reznor replacement part maintains system efficiency and prevents nuisance shutdowns, making it a staple for contractors maintaining Reznor unit heaters and modular gas-fired systems.

• Precise Pressure Sensing: Factory-set at 2.25"wc to ensure exact adherence to manufacturer safety thresholds.
• Reliable SPDT Logic: Single-pole double-throw configuration provides flexible wiring options for control circuit integration.
• OEM Compatibility: Specifically engineered as a direct-fit Reznor 235953 replacement to eliminate field-modification requirements.
• Enhanced Safety: Acts as a primary failsafe to prevent burner operation during insufficient airflow or venting obstructions.

What causes a Reznor 235953 pressure switch to trip?
Trips usually occur due to a failing venter motor, cracked heat exchanger, blocked flue pipe, or degraded silicone tubing. Ensure these components are inspected before replacing the switch.

Can this switch be used in high-elevation applications?
Yes, but always verify your specific model's elevation rating. Reznor units often require specific pressure switches like the 235953 to account for changes in air density at varying altitudes.

How do I test the 235953 pressure switch for continuity?
Use a multimeter to check for continuity between the COM and NO (Normally Open) terminals while the venter motor is running and applying the rated 2.25"wc pressure.

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.