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Lennox 74W77 is a control-limit (temperature limit) switch rated to open at 155 F and sold as part number 102135-12. The device functions as an HVAC safety/limit control for furnaces and air handlers and is offered as an OEM replacement (alternate model L155-30F). It is compact and lightweight, suitable for space-constrained control panels and limit-protection applications.
OEM Lennox control-limit switch (MPN 74W77 / 102135-12), 155 F temperature rating, compact SPDT limit switch for HVAC safety and control
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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