Description
Nordyne 632443R Pressure Switch Overview
The Nordyne 632443R is an OEM replacement SPST (Single-Pole, Single-Throw) pressure switch engineered for use in Nordyne-family heating systems. Designed to monitor negative pressure generated by the inducer motor, this switch helps ensure safe furnace operation by confirming proper venting and combustion airflow before allowing the ignition sequence to proceed.
Key Specifications
- Part Number: 632443R
- Switch Type: SPST (Single-Pole, Single-Throw)
- Set Point: -0.85″ w.c. (inches water column)
- Port Connection: 1/4″ barbed fitting
- OEM Replacement for Nordyne heating systems
How It Works
The pressure switch is wired into the furnace control circuit and connected via a flexible hose to the inducer housing or collector box. When the draft inducer motor runs and creates sufficient negative pressure (reaching the -0.85″ w.c. set point), the SPST switch closes, signaling the control board that safe venting conditions are confirmed. If the required pressure is not achieved — due to a blocked flue, failed inducer, or disconnected hose — the switch remains open and prevents ignition, protecting the equipment and occupants.
Why Choose an OEM Replacement?
- Engineered to Nordyne factory specifications for reliable, accurate switching
- Direct drop-in replacement — no modifications required
- Maintains OEM safety performance and system warranty integrity
- 1/4″ barbed port ensures a secure, leak-free hose connection
- SPST design provides clean, dependable open/close switching action
Compatible Applications
This pressure switch is a direct OEM replacement part for select Nordyne-brand furnaces and air handlers. Always verify compatibility with your unit’s model number and wiring diagram before installation. Consult the equipment service manual or contact a qualified HVAC technician if you are unsure of the correct replacement part.
Installation Notes
- Disconnect power to the unit before servicing
- Inspect the pressure hose for cracks, blockages, or disconnections before replacing the switch
- Ensure the 1/4″ barbed port connection is fully seated and the hose is secured
- Test system operation after installation to confirm proper switch function
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