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high voltage surges
For ducts wider than 4 feet
This indicates the open temperature is 80°F and the close temperature is 31°F
What causes a limit switch like the 626612 to fail frequently
Lennox 66J78 Limit Switch Els PW 17895 high voltage surgesExperienced HVAC contractors recognize the Lennox 66J78 Limit Switch as a critical safety component for maintaining furnace integrity and preventing heat exchanger damage. This OEM Lennox replacement part is a 36T series disc style control designed for High Limit or Secondary Rollout applications. It features a Normally Closed (NC) circuit that opens on temperature rise to interrupt the heating cycle if internal temperatures exceed safe operating
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