What does the green color code signify on these controls

the ST-D24 thermistor ensures tighter setpoint control and improved system efficiency across various air handling unit (AHU) configurations

This adapter is specifically engineered for Johnson Controls VA-715X series actuators

For refrigeration systems running R404A or R507

and mixed gases

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