Reznor 105507 Pressure Switch

The Reznor 105507 Pressure Switch is a critical safety component for combustion air proving in OEM Reznor unit heaters. This SPDT pneumatic switch (Single Pole Double Throw) features an adjustable set point range from 0.15" to 5.0" WC, making it an essential replacement part for HVAC repair and maintenance on models like the RP, RPB, SC, and SCE series. As a veteran-grade differential air pressure switch, it ensures the inducer motor is generating the correct static pressure before allowing the ignition sequence to proceed, preventing hazardous gas buildup.

Designed for industrial-grade durability, the Reznor 105507 replaces obsolete part numbers and features standard 1/4" and 3/16" quick-connect terminals. For technicians working on older units (pre-1999), ensure you utilize the included terminal adapters to meet current ANSI/CSA requirements. The switch is built to monitor the negative pressure generated by the flue exhaust, providing a reliable signal to the integrated control board for safe, continuous operation in commercial heating environments.

• Precise Pressure Sensing: Features a wide 0.15" to 5.0" WC adjustment range to match specific technical requirements for multiple Reznor equipment lines.
• Versatile Compatibility: Engineered as a direct OEM replacement for variety of legacy and current models, including RPB and SC unit heaters.
• Standardized Electrical Interface: Equipped with an SPDT contact configuration for flexible NO/NC (Normally Open/Normally Closed) wiring.
• Rugged Construction: Built for high-cycle reliability in industrial HVAC settings, ensuring long-term system stability.

How do I troubleshoot a pressure switch error on a Reznor heater?
First, inspect the silicone tubing for cracks or moisture. Use a manometer to verify the inducer is pulling the required WC (Water Column) pressure. If the pressure is sufficient but the 105507 switch fails to close, the internal diaphragm or contacts may be fouled.

Can I use the Reznor 105507 to replace older "square" style switches?
Yes, this universal Reznor pressure switch kit is the official replacement for several obsolete versions. When retrofitting, always check the terminal sizing, as older units may require using the crimp-on adapters included with the assembly.

What causes this switch to trip frequently?
Frequent trips are often caused by exhaust vent blockages, a failing inducer motor, or a cracked heat exchanger. Always clear the orifice port on the blower housing to ensure the sensing line is receiving an accurate signal.

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.