What does the green color code signify on these controls

The Nordyne 626548R Limit Switch is a critical safety component designed for high-limit temperature monitoring in Intertherm

preventing lead separation under thermal expansion

the 1320364 offers a direct-fit solution that maintains the internal safety string integrity without the calibration drift often found in generic aftermarket controls

this dry case pressure gauge is the standard choice for monitoring system pressure in boilers

Lennox 66J78 Limit Switch Els PW 17895 What does the green colorExperienced 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