Description
The Nordyne 632491R is a factory-original OEM pressure switch engineered to protect furnace and heating equipment from unsafe operating conditions. Designed as a direct replacement for compatible Nordyne-family equipment, this switch monitors negative draft pressure and interrupts system operation when pressure falls outside the safe operating range — helping prevent heat exchanger damage, incomplete combustion, and carbon monoxide hazards.
Key Features
- Set point: -1.50″ w.c. (water column) — factory-calibrated for precise draft pressure monitoring
- Connection type: 1/4″ barb — compatible with standard rubber or silicone pressure tubing
- Switch configuration: SPST (Single-Pole, Single-Throw) — opens circuit on pressure loss for fail-safe operation
- OEM replacement part — designed and specified for Nordyne-family furnaces and air handlers
- Compact, durable construction built to withstand the demands of residential and light commercial HVAC environments
How It Works
The pressure switch is connected via its 1/4″ barb fitting to the inducer or draft proving port. During normal operation, the inducer motor creates a negative pressure that closes the SPST switch contacts, allowing the control board to proceed through the ignition sequence. If the draft pressure drops below the -1.50″ w.c. threshold — due to a blocked flue, failed inducer, or cracked pressure tubing — the switch opens and shuts down the heating sequence, protecting the system and occupants.
Application
- Direct OEM replacement for select Nordyne, Frigidaire, Gibson, Tappan, and Westinghouse brand furnaces
- Suitable for residential and light commercial forced-air heating systems
- Ideal for service technicians performing routine maintenance or component-level diagnostics
Why Choose OEM?
Using a genuine Nordyne OEM pressure switch ensures the correct set point, connection geometry, and electrical rating for your specific equipment — eliminating the guesswork of aftermarket substitutions and maintaining equipment warranty compliance.
Specifications
- SKU: 632491R
- Brand: Nordyne
- Set Point: -1.50″ w.c.
- Connection: 1/4″ Barb
- Switch Type: SPST (Single-Pole, Single-Throw)
- Part Type: OEM Pressure Switch
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