providing superior protection against physical damage and EMI interference

What does the green color code signify on these controls

Precision Orifice: Factory-calibrated for natural gas to provide stable flame characteristics and reliable sensor feedback

Reduced Downtime: The complete rebuild kit includes all wear-and-tear items

This OEM Lennox part is a manual reset

Johnson Controls A19AHA-6 Utility Thermostat Els PW 17895 providing superior protection against physicalUtility Thermostat, 120 208 240 Vac, 20 100 Degree Temperature Range, 3 12 Adjustable Differential, 6' Capillary Length, Remote Bulb, Automatic Reset, No Enclosure