632674 Nordyne Condensate Pressure Switch
632674 Nordyne Condensate Pressure Switch
Description
The 632674 is an OEM condensate pressure switch designed to protect Nordyne M7RL gas furnaces from condensate overflow. It trips at approximately 0.30" water column, opening its dry-contact circuit to prevent drainage buildup and system lockout. Packaged with a two-wire pigtail and mounting bracket, it directly replaces part number 632492 for reliable condensate management.
Compatibility
| Series / Brand | Model Variants | Pressure Setpoint | Replaces |
|---|---|---|---|
| Nordyne M7RL | 045A-AW, 045A-BW<br>072A-AW, 072A-BW | 0.30" WC | 632492 |
| Intertherm M7RL | 045A, 072A | 0.30" WC | 632492 |
Installation Tips
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Mount the switch so its sensing port connects to the condensate pan drain line via the OEM tubing or clip.
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Use ¼" insulated spade terminals on the two switch lugs; avoid over-torquing.
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Verify switch activation with a manometer: apply vacuum until ~0.30" WC and confirm the contacts open.
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Inspect tubing for kinks, debris, or water traps that could impede proper sensing.
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After installation, cycle the furnace through a condensate test mode to confirm correct operation.
Cross-Reference & Resources
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OEM mapping: 632492 → 632674 (updated revision)
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Condensate pan and tubing routing diagram (Nordyne M7RL series)
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Technician service checklist: condensate switch test procedure