Install, fabricate and/or connect compressors, condensers, evaporators, motors, expansion/discharge valves, temperature/humidity controls, fans, control panels, switches, fuses, filters, gauges, ducts, piping, tubing, environmental controls, and related components, complete power connections. PMs, troubleshooting, diagnosing, and repairing commercial HVAC Systems (Up to 20 tons), controls, chilled water systems, boilers, variable volume air systems, and DDC controls.