632493R Nordyne SPST Pressure Switch
632493R Nordyne SPST Pressure Switch
Product Overview
632493R is a genuine OEM Nordyne SPST pressure switch set to actuate at 0.60 in WC, designed to verify inducer blower vacuum in gas furnaces. Its reliable automatic-reset action ensures accurate safety interlocks in residential and light-commercial heating systems.
Technical Specifications
| Specification | Detail |
|---|---|
| Switch type | SPST normally open, automatic reset |
| Actuation pressure | 0.60 in WC |
| Vacuum port | 1/4 in barb connection |
| Terminals | Two 1/4 in male quick-connect spades |
| Mounting style | Snap-in bracket |
| Ambient temperature | –40 °F to 150 °F |
| Net weight | 0.03 lb |
| Shipping dimensions | 10 × 12 × 12 in |
| Packaging weight | 10 oz |
Cross-Reference Part Numbers
| OEM Part Number | Equivalent Function |
|---|---|
| 632493R | 0.60 in WC SPST inducer vacuum switch |
Compatibility
Fits most Nordyne, Coleman, Heil, Westinghouse, and private-label furnaces originally equipped with a 0.60 in WC SPST pressure switch. Before ordering, verify:
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Furnace data-plate cut-in pressure requirement (0.60 in WC)
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Vacuum tubing inner diameter (1/4 in ID recommended)
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Mounting bracket style and footprint
Installation & Technician Notes
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De-energize power and follow lockout/tagout procedures.
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Remove furnace or air-handler access panels to expose the inducer housing.
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Label and disconnect the vacuum tubing and spade terminals.
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Depress the switch’s bracket tab to release it from the mounting rail.
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Install tubing on the 1/4 in barb and snap the switch into the bracket.
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Reconnect spade terminals to their original positions.
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Restore power; initiate a heat call and confirm the inducer runs only once the switch closes.
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Test safety cutoff by simulating loss of vacuum below 0.60 in WC.