Will have an in-depth knowledge of Refrigeration, Heating and Air Conditioning systems Including chillers, cooling towers, Computer Room Air Conditioner Units (DX and Chilled water) RTU’s, (DX and chilled water) and Air Handling Units. Job Duties and Responsibilities: The Journeyman HVAC Technician is responsible for repairing, installing, replacing, and testing HVAC/R, and control circuits, equipment, and appliances and repair of environmental control systems.