changes, rebuilds and services semi-hermetic compressor, replaces piping, replaces rotating equipment component, replaces electric and steam humidifiers, repairs air compressors and related control, replaces belts, pulleys, motors, etc.); pumps down, may excavate and recharge refrigerant systems, calibrates electrical and pneumatic control components and makes repairs as needed; diagnoses malfunctions and repairs or replaces defective systems through modification overhaul if necessary; operates emergency backup equipment as required; performs various semi-skilled and skilled tasks (e.g., plumbing, carpentry, wiring, painting, plastering, glazing, welding, etc.). May stand for long periods of time, lift heavy objects, and work in uncomfortably hot or cold environments, in awkward and cramped positions, or on ladders; could require working outdoors and be subject to inclement weather; lift up to 50 lbs without material handling device; ability to use and wear personal protective equipment: half-face respirators/dust mask, safety glasses, body harness for fall protection, arc flash clothing level two protection (hard hat, Class 2 gloves/leather, face shield, neck protector, coveralls), fire rated long sleeve shirts, earplugs/muffs and hand protection.