Description
Rheem-Ruud 42-24194-86 Pressure Switch Overview
The Rheem-Ruud 42-24194-86 is an OEM replacement pressure switch engineered for precise draft and combustion air proving in Rheem and Ruud heating equipment. With a set point of .20″ water column (w.c.) and a reliable SPST (Single Pole, Single Throw) configuration, this switch monitors negative pressure within the flue or inducer assembly to confirm safe operating conditions before allowing burner ignition — a critical safety function in modern gas furnaces.
Key Features
- Set Point: .20″ w.c. (water column) for accurate draft proving
- Switch Type: SPST (Single Pole, Single Throw) for straightforward open/close circuit control
- Connection: 1/4″ barb fitting for secure hose attachment to the inducer or collector box port
- OEM Rheem-Ruud part number 42-24194-86 for direct, no-modification replacement
- Designed to protect against incomplete combustion and unsafe flue conditions
- Compatible with select Rheem and Ruud gas furnace models requiring this specification
How It Works
The pressure switch senses the negative pressure (vacuum) generated by the draft inducer motor. When the inducer establishes the correct airflow, the pressure differential reaches the .20″ w.c. set point, closing the SPST switch contacts and signaling the furnace control board to proceed with ignition. If adequate draft is not confirmed, the switch remains open, preventing unsafe burner operation.
Application & Compatibility
This switch is a direct OEM replacement for Rheem and Ruud gas furnaces that specify part number 42-24194-86. Always verify compatibility with your equipment’s model and serial number before installation. Consult the furnace wiring diagram and service manual to confirm the correct set point and connection type for your application.
Installation Notes
- Disconnect power to the furnace before servicing
- Attach the 1/4″ barb port to the appropriate hose from the inducer housing or collector box
- Ensure the hose is free of cracks, kinks, or blockages that could affect pressure readings
- Verify wiring connections match the original switch terminals before restoring power
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