Description
The Rheem-Ruud SP20130 is an OEM replacement pressure switch engineered to maintain safe and efficient furnace operation. Set at -0.90″ W.C. (inches of water column), this switch monitors negative pressure generated by the draft inducer motor and confirms proper venting before allowing the ignition sequence to proceed — a critical safety function in modern gas furnaces.
How It Works
The pressure switch senses the pressure differential created by the inducer blower. If adequate negative pressure is not established — indicating a blocked flue, failed inducer, or venting issue — the switch remains open and prevents the furnace from firing. This safeguard protects against dangerous combustion gas backdrafting into the living space.
Key Features
- OEM Rheem-Ruud replacement part — direct fit for compatible models
- -0.90″ W.C. setpoint for precise pressure sensing
- Monitors draft inducer operation to confirm safe venting
- Prevents ignition sequence if proper negative pressure is not achieved
- Designed for long-term reliability in residential and light commercial furnace applications
- Replaces worn, stuck, or failed pressure switches to restore proper furnace function
Application
This pressure switch is a direct OEM replacement for select Rheem and Ruud gas furnace models. Always verify compatibility with your specific furnace model number before installation. Refer to the furnace wiring diagram and service manual for proper installation procedures.
Why Replace Your Pressure Switch?
A faulty pressure switch is one of the most common causes of furnace lockout and no-heat calls. Symptoms include the furnace failing to ignite, short cycling, or a diagnostic fault code indicating a pressure switch error. Replacing the switch with a genuine Rheem-Ruud OEM part ensures proper calibration and reliable operation.
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