Check and test new equipment before installation; calibrate pneumatic and electrical controls; calibrates repairs and replaces thermostats; adjust, balance and redesign air flow through ducts, diffusers, and registers; sets time clocks for heating, ventilating and air conditioning equipment; maintain chemical water treatment for cooling towers, hot and cold water systems and thermal energy storage systems; operate and adjust building electronic controls for temperature and scheduling control; initiate and implement preventive maintenance system. Inspect, repair, maintain, troubleshoot, adjust and regulate heating, ventilation, refrigeration and air conditioning equipment including heat pumps, heating and ventilating units, air conditioning with gas or electric heat, reciprocating chillers, multi-zone units, hot water heating boilers, cooling towers, thermal energy storage systems, pumps, air handlers, return and exhaust fans, air compressors, variable air volume systems, refrigerators, and ice makers.