MasTec - - Responsibilities: Maintaining commercial cooling systems on cell tower cooling units diagnosing, troubleshooting, repairing, or installing and replacing components of entire systems; Replacing or installing forced air heating and air conditioning systems; replacing or installing complete hydronic heating systems or refrigeration equipment; Installing or replacing duct systems in telecommunication shelters; Testing electrical circuits and components for continuity, using electrical test equipment; testing pipe or tubing joints and connections for leaks; Layout and connect the electrical wiring between the controls and equipment according to the wiring diagram