Reznor 197028 Pressure Switch

The Reznor 197028 Pressure Switch is a critical safety component designed for precise draft monitoring in high-output unit heaters. Engineered as a genuine OEM replacement part, this high-altitude pressure switch features a factory-calibrated .65" WC set point and a Single Pole Single Throw (SPST) configuration. It is specifically utilized in Reznor UDX, UDZ, UBX, and UBZ series heaters (size 125) for installations above 6,000 feet, as well as several UDAP and UDAS models. By sensing the negative pressure generated by the inducer motor, the switch completes the safety circuit to verify proper combustion airflow before allowing the ignition sequence to proceed.

Constructed with dual 1/4" barb connections for secure hose attachment, the 197028 ensures the system remains protected against venting obstructions or mechanical failure. Replacing an aging or out-of-spec furnace pressure switch helps prevent nuisance lockouts and ensures the heater meets the specific static pressure requirements of thinner air in elevated regions. This HVAC pressure switch is the standard solution for contractors maintaining Reznor equipment to factory standards in demanding environments.

• Optimized for High Altitude: Factory-set at .65" WC to ensure reliable ignition and safety in elevated locations above 6,000 feet.
• Full System Compatibility: Direct fit for Reznor UDX125, UDZ125, UBX125, UBZ125, and older series including UDAP and UDAS.
• Industrial Build Quality: Features a durable housing and a high-accuracy diaphragm designed for the high-cycle demands of commercial unit heaters.
• Simplified Installation: Standard 1/4" barb connections and OEM wiring compatibility allow for a quick, drop-in replacement during service calls.
• Verified Safety Circuitry: Prevents gas valve activation if the inducer motor fails or the flue pipe becomes obstructed.

When should I use the 197028 instead of the standard pressure switch?
This switch is required when installing or servicing UD series unit heaters at altitudes over 6,000 feet, or as a direct replacement for specific low-BTU models where a .65" WC set point is specified by the manufacturer.

Will this switch fix a "Pressure Switch Stuck Open" fault code?
While a faulty switch is a common cause, technicians should first verify that the inducer motor is reaching full RPM, the flue is clear, and the collection chamber ports are not clogged with debris before replacing the component.

Does the 197028 include the mounting bracket and tubing?
This is the individual pressure switch component. It is designed to mount to existing hardware and utilize standard 1/4" ID silicone or rubber tubing found in Reznor units.

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.