632491R Nordyne Pressure Switch
632491R Nordyne Pressure Switch
Normal Stock Item
Product Overview
632491R is an official OEM Nordyne pressure switch designed to monitor inducer draft in residential gas furnaces. It features a single pole, single throw contact that closes when a vacuum of –1.50" WC is reached, ensuring safe ignition and combustion control.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 632491R |
| Pressure Set Point | –1.50" WC (activates at –1.50 inches water column) |
| Maximum Make Point | –1.70" WC |
| Contact Type | SPST (Single Pole Single Throw) |
| Connection | 1/4" barbed tube |
| Housing Material | High-impact thermoplastic |
| Mounting Bracket | Integrated zinc-plated steel |
| Weight | 0.08 lb (36.3 g) |
Specifications compiled from OEM data and industry references. Pressure switch set point and contact type from SupplyHouse. Connection details from Neuco listings. Maximum make point from Intertherm cross-reference.
Cross-Reference Part Numbers
| OEM Part Number | Notes |
|---|---|
| 632491R | Current OEM Nordyne pressure switch |
| 632491 | Original non-R version; often superseded |
Compatibility
Fits Nordyne, Miller-Nordyne, Nortek Global HVAC, and Intertherm furnaces originally equipped with a –1.50" WC pressure switch. Common applications include:
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Nordyne CMF95, M8 series single-stage induced-draft gas furnaces
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Intertherm M4RL mobile-home furnace models
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Miller-Nordyne CF and CT series light-commercial furnaces
Always verify the appliance’s data plate for pressure switch requirements before ordering.
Technician Notes
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De-energize electrical power and shut off gas before servicing.
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Inspect the existing 1/4" vacuum tubing for cracks or blockages; replace if necessary.
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Mount the new switch on the furnace’s bracket, ensuring the barb is fully seated in the tubing.
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Reconnect the SPST terminals according to the wiring diagram or service manual.
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Restore power and initiate a heat call; confirm inducer motor starts and switch closes at –1.50" WC.
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Use a manometer to verify opening and closing pressures: switch should open above –1.50" WC and close below –1.70" WC.
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Check for vacuum leaks around the barb and switch housing