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If the vacuum is sufficient but the SPNO contact remains open
this is an auxiliary switch designed for pilot duty and control signals
Unlike potential relays that sense CEMF
Circuit Protection: Features a manual reset breaker to protect the secondary circuit from shorts and overloads
Lennox 18J37 Limit Switch If the vacuum is sufficientThe Lennox 18J37 Limit Switch is a critical safety component engineered for high performance thermal regulation in residential and light industrial furnaces. As a normally closed disc style limit control, this genuine OEM Lennox replacement part is specifically designed to prevent heat exchanger damage by interrupting the burner circuit if internal temperatures exceed safety thresholds. Featuring a yellow color coded sleeve for rapid field
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