To qualify, must be skilled in one or more of the following areas: Electricians must be skilled in troubleshooting, installing and repairing industrial electrical 3 phase and single phase motor controls (i.e., hydraulic motors, compressors, pumps, fueling equipment, etc.) as well as other general building electrical systems. Refrigeration/HVAC Journeyist must be skilled in troubleshooting, repairing, and installing refrigeration equipment that uses R-410A and R-22 refrigerant, forced air natural gas systems heating systems, and boiler heating systems, in a multi-zone HVAC systems.