632444R Nordyne Pressure Switch

Product Overview

632444R is an official OEM –1.74" WC SPST pressure switch for Nordyne HVAC equipment. It closes when the inducer or combustion air motor generates the required negative pressure, ensuring safe ignition and reliable system operation.

Technical Specifications

• Switch type: Single Pole Single Throw (SPST)

• Pressure setpoint: –1.74" Water Column (WC)

• Connection: 1/4" barbed vacuum hose inlet

• Contact action: Normally open; closes upon reaching vacuum threshold

• Housing material: Durable plastic and metal components designed for high-temperature environments2

Cross-Reference Part Numbers

This switch supersedes multiple legacy Nordyne and Miller combusion-air switch part numbers, streamlining inventory management.

Compatibility

• Nordyne gas furnaces requiring a –1.74" WC SPST switch

• Intertherm, Miller, Tappan, Gibson, Frigidaire, White-Westinghouse, Philco, Garrison, Mammoth, Medallion units with equivalent pressure requirements

• Many private-label models from Nortek Global HVAC with identical switch specifications

Always verify against the appliance’s data plate or service manual before ordering.

Technician Notes

• De-energize electrical and gas supplies before servicing.

• Tag and photograph existing vacuum tubing routing and terminal connections.

• Use 1/4" vacuum hose rated for negative pressure; avoid kinks or restrictions.

• After installation, initiate an inducer call and confirm switch closure at –1.74" WC.

• Inspect hose fittings and switch terminals for leaks or corrosion; replace tubing if brittle.

Additional Resources

• OEM wiring diagram & installation manual (PDF)

• Printable cross-reference cheat sheet for pressure switches

Also referred to as a combustion air switch or draft proving switch. -1.74. Switch closes when the combustion/booster motor runs creating a negative air pressure.

For replacement tubing, order part # B13-614.

Replaces 632252 and 632444.