Reznor 205445 Pressure Switch

The Reznor 205445 Pressure Switch is a critical safety component calibrated for a .15"wc pressure setting to ensure proper drafting and combustion air in commercial unit heaters. Designed for high-reliability applications, this genuine OEM replacement part monitors the negative pressure generated by the inducer motor, verifying that exhaust gases are safely vented before the ignition sequence begins. It serves as a safety limit switch that prevents burner operation during venting obstructions or inducer motor failure.

Built as a direct replacement for the discontinued Reznor 164672, the 205445 features a Single Pole Single Throw (SPST) configuration. This differential air pressure switch is frequently used in Reznor LDAP series heaters and other gas-fired unit heaters. When troubleshooting HVAC error codes related to "pressure switch stuck open," this 0.15" WC unit provides the exact technical specifications required to restore factory-standard performance. Its compact, durable housing is engineered to withstand the demanding conditions of industrial mechanical rooms and warehouse heating environments.

• Precise .15" WC Calibration: Ensures accurate air pressure monitoring for optimal combustion safety.
• Direct OEM Swap: Engineered to replace the Reznor 164672 with zero modifications required.
• Enhanced HVAC Safety: Automatically interrupts the ignition sequence if abnormal venting or flue obstructions are detected.
• Compatible with Reznor Heaters: Specifically designed for LDAP 800 and LDAP 1200 models, among others.
• Durable Construction: High-quality materials resist wear from rapid cycling and vibration.

Is the 205445 compatible with the older 164672?
Yes, the 205445 is the manufacturer-designated direct replacement for part number 164672, maintaining the identical .15" WC set point.

What causes this switch to trip frequently?
Repeated trips are often caused by a failing inducer blower, blocked flue vents, or cracked vacuum tubing. Always inspect the air lines for moisture or debris before replacing the switch.

Can I use a switch with a different WC rating?
No. Pressure switches are safety devices calibrated to specific venting requirements. Installing a switch with an incorrect rating can lead to hazardous operation or incomplete combustion.

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.