Description
The Armstrong Furnace R102699-02 is a factory-specified replacement pressure switch engineered to protect your furnace’s heat exchanger and venting system. Calibrated to a set point of -0.70″ water column (w.c.), this switch monitors the negative pressure generated by the draft inducer blower and confirms that proper airflow is established before allowing the ignition sequence to proceed — a critical safety function in modern induced-draft and condensing furnaces.
Key Features
- Set Point: -0.70″ w.c. (negative pressure)
- Switch Type: SPST (Single-Pole, Single-Throw)
- Connection Type: Dual 1/4″ barb fittings for secure hose attachment
- Direct OEM replacement for compatible Armstrong Furnace models
- Designed to verify adequate draft inducer operation before ignition
- Helps prevent unsafe furnace operation due to blocked venting or inducer failure
How It Works
The pressure switch senses the negative pressure (vacuum) created by the draft inducer motor. When the inducer reaches the correct operating speed and the flue is unobstructed, the pressure drops to the calibrated set point (-0.70″ w.c.), causing the SPST switch contacts to close and signal the control board to advance the ignition sequence. If the required pressure is not achieved — due to a blocked flue, failed inducer, or cracked pressure hose — the switch remains open, locking out the furnace and preventing hazardous operation.
Installation Notes
- Verify compatibility with your specific Armstrong Furnace model before installation
- Inspect pressure hoses and barb fittings for cracks or blockages during replacement
- Dual 1/4″ barb connections allow for straightforward hose routing
- Always disconnect power before servicing the furnace
Application
This pressure switch is a genuine OEM-specified component intended for use in Armstrong Furnace equipment. It is ideal for HVAC technicians performing routine maintenance, warranty repairs, or troubleshooting furnaces that exhibit lockout conditions related to inducer or venting faults.
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