Must have complete working knowledge of HVAC chilled water and DX systems, including design, operation, and testing of: Chillers, Boilers, Cooling towers, pumps, heat exchangers, AHU, RTU, ERU, VAVs, exhaust, FCU, etc. Must have complete working knowledge of HVAC chilled water and DX systems, including design, operation, and testing of: Chillers, Boilers, Cooling towers, pumps, heat exchangers, AHU, RTU, ERU, VAVs, exhaust, FCU, etc.