Reznor 193807 Pressure Switch

The Reznor 193807 Pressure Switch is a critical safety and operational component designed for precise combustion air pressure monitoring in various Reznor unit heaters and furnaces. This SPDT pressure switch is factory-calibrated to a .90" WC set point, ensuring the inducer motor is generating the correct static pressure before allowing the ignition sequence to proceed. It features a dual 1/4" barb connection for secure pneumatic tubing attachment, facilitating accurate differential pressure sensing across the heat exchanger or vent system.

Engineered for high-reliability applications, the Reznor 193807 serves as a direct OEM replacement pressure switch for several series, including ADF, DFAH, and SC models manufactured prior to 2003. Its single-pole double-throw configuration provides clear signal feedback to the integrated ignition control board, preventing burner operation under blocked vent or failed blower conditions. When performing a field replacement, verify the .90 inch water column rating matches the original equipment specification on the unit's data plate to maintain HVAC system safety and efficiency.

• Precise .90" WC Trip Point: Calibrated to exact manufacturer specifications for reliable heater startup and operation.
• SPDT Electrical Configuration: Provides versatile switching logic compatible with modern furnace control boards.
• Dual Barb Connectors: Simplifies installation with standard 1/4" ID silicone or rubber pressure tubing.
• OEM Compatibility: Specifically designed to replace obsolete components in Reznor RP, RPB, and SC series heating units.
• Rugged Housing: Built to withstand the temperature fluctuations typical of a commercial combustion chamber environment.

What happens if the pressure switch fails to close?
If the Reznor 193807 does not detect the required .90" WC pressure, the control board will lock out the ignition process as a safety precaution, preventing potential flue gas recirculation or carbon monoxide issues.

Can I use this switch for a unit requiring a different WC rating?
No. Pressure switches are safety-rated components. Always replace a HVAC pressure switch with one that matches the specific "Water Column rating labeled on the manufacturer's data tag to ensure the system trips at the correct threshold.

How do I connect the dual 1/4" barb ports?
One port typically monitors the positive pressure from the blower while the other senses the negative pressure (vacuum) in the combustion box. Ensure tubes are free of moisture and cracks during the 193807 switch 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.