626494R Nordyne limit switch 5" L280-40F
626494R Nordyne limit switch 5" L280-40F
Product Overview
626494R Nordyne limit switch 5" L280-40F is an OEM automatic-reset temperature-limit control designed to protect gas furnaces from overheating. It trips open at 280 °F and resets at 240 °F, interrupting burner or blower power whenever heat-exchanger temperatures exceed safe limits. Housed in a compact chassis-mount package with two quick-connect terminals, it provides reliable, repeat-cycle protection without manual intervention.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 626494R |
| Model | L280-40F |
| Function | Automatic-reset high-limit safety switch |
| Trip Temperature | 280 °F ± 5 °F |
| Reset Temperature | 240 °F ± 5 °F |
| Temperature Differential | 40 °F |
| Bulb Diameter | 1/2″ |
| Bulb Length | 5″ |
| Body Dimensions | 1-3/4″ × 1-1/2″ |
| Contact Configuration | SPST normally closed |
| Terminals | Two 1/4″ male quick-connect spades |
| Mounting | Snap-in chassis-mount clip |
| Housing Material | High-temperature thermoplastic |
| Operating Ambient Range | 32 °F to 175 °F |
| Net Weight | 0.38 lb |
| Packaging Weight | 10 oz |
Cross-Reference Part Numbers
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Replaces Nordyne 626494 (auto-limit switch)
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Neuco Manufacturer Part ID: 120217
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Alternate size code: 36T01B5
Compatibility
Fits Nordyne and Nordyne-Miller gas furnaces originally equipped with an L280-40F automatic-reset limit control. Also compatible with Intertherm, Coleman, Amana, Ducane, and various private-label units that call for a 280 °F high-limit cut-out with 40 °F reset differential. Always verify the furnace’s data-plate specifications before ordering.
Technician Notes
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De-energize all power and shut off the gas supply; follow lockout/tagout procedures.
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Remove the furnace access panel to expose the existing limit switch.
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Photograph or label the quick-connect terminals to capture original wiring orientation.
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Press the snap-in clip or depress mounting tabs to release and remove the old switch.
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Insert the 5″ sensing bulb into its mounting clip and snap the new 626494R into place.
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Reconnect spade terminals, ensuring full engagement on each lug.
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Restore power and call for heat; verify the switch opens at approximately 280 °F and recloses near 240 °F.
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If nuisance trips occur, inspect airflow pathways, check inducer and blower operation, and confirm filter and venting conditions before retesting.
Service limit switch, 1/2" diameter, 5" long. L280-40F. End with 2 terminals measures 1-3/4 x 1-1/2". Size 36T01B5. Replaces 626494.