Nordyne Intertherm 632451 Pressure Switch 0.90 W.c.

Product Description

The NORDYNE INTERTHERM 632451 is a normally open pressure switch rated at 0.90 inches water column (W.C.), designed for use in gas furnace applications. This switch monitors the negative pressure produced by the inducer motor during the heating cycle. When the inducer establishes proper draft, the pressure switch closes and signals the control board to proceed with ignition. It is a direct-fit OEM-style replacement component installed by licensed HVAC technicians during routine service or system troubleshooting.

This pressure switch is specified for the Intertherm M3 060 gas furnace. It is a critical safety component in the draft-proving circuit, preventing ignition if adequate combustion airflow is not confirmed. Replacement is typically required when the switch fails to close under normal operating conditions, becomes waterlogged, or shows continuity failure on diagnostic testing.

Key Features

• Normally open (NO) configuration closes on sufficient negative draft pressure
• Set point rated at 0.90 inches water column (W.C.)
• OEM-style replacement for the Intertherm M3 060 furnace platform
• Integral to the inducer-proving safety circuit, blocking ignition on loss of draft

Compatibility

Designed as a direct replacement for the Intertherm M3 060 gas furnace as stated by the manufacturer. Reference MPN 632451 when cross-checking against the furnace parts diagram.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with local mechanical codes and the furnace manufacturer service instructions. Shut off power to the unit at the disconnect and allow the inducer and heat exchanger to cool before handling components. The pressure switch hose and port should be inspected for moisture, cracks, or blockage before the new switch is installed. Do not bypass or jumper the pressure switch circuit during diagnostics beyond momentary testing procedures outlined in the service manual.

Technical Specifications

• Switch Type: Normally Open (NO)
• Set Point: 0.90 inches W.C.
• Application: Gas furnace draft proving circuit

Standard Information

• Brand: NORDYNE INTERTHERM
• Manufacturer Part Number: 632451