632495R Nordyne -0.80" WC SPST Pressure Switch

Product Overview

632495R is an official OEM pressure switch designed for Nordyne and Nordyne Miller gas furnaces, air handlers, and HVAC equipment. It senses a negative pressure of ‑0.80" water column and closes a single-pole, single-throw (SPST) dry contact to verify inducer motor operation and airflow before ignition, ensuring safe and reliable system starts.

Technical Specifications

Data compiled from SupplyHouse and Snook & Aderton HVAC specifications2.

Cross-Reference Part Numbers

• OEM Nordyne part number: 632495R

• OEM Nordyne Miller part number: 632495R

No alternative or superseded numbers have been documented; use 632495R for direct factory replacement.

Compatibility

This switch fits Nordyne, Nordyne Miller, and Intertherm gas furnaces and air handlers that require a –0.80" WC SPST pressure switch. It drops in place of factory-installed switches across multiple model series, ensuring consistent negative-pressure verification and safety interlock functions.

Technician Notes

• Confirm tubing from the inducer housing is clear, free of debris, pinches, or kinks to avoid false pressure readings.

• Use a manometer to verify the switch actuates (closes) at approximately –0.80" WC and opens when pressure falls below that threshold.

• Mount the switch per OEM orientation, ensuring the arrow (if present) points toward the inducer.

• Inspect vacuum tubing connections for snug fit on the port—loose fittings can cause nuisance lockouts.

• No external mounting bracket is required beyond the factory clip; replace any worn bracket hardware or grommets to maintain stable positioning.

• Test continuity across the SPST contacts with a multimeter when disassembled to confirm internal contact integrity.