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HVAC Refrig Mechanic II

Commonwealth of Massachusetts Otis, MA
  • Posted: November 01, 2019
  • Full-Time

The primary purpose of this position is:  To install, repair, and modify large/complex systems that provide for a

variety of air conditioning functions such as heating, cooling, humidifying, dehumidifying, cleaning, filtering, and circulating.


a. The employee repairs and maintains a variety of large commercial and industrial refrigeration and air conditioning systems and supporting equipment with complex problems and extensive repairs requiring judgment to locate malfunctions. (cont para 6)

b. Maintains, repairs, and tests a variety of complex equipment and systems involving power boilers, single and multiple fuel power boilers, and associated auxiliary and pollution control equipment such as water treatment systems, chemical dispensers, electrostatic precipitators, bag houses and ash removal equipment, and wet particulate scrubbers. (cont para 6)

c. Plans, lays out, and installs a variety of large complex commercial and industrial systems and supporting equipment used to condition air in warehouses, shops, hangars, and large office buildings. (cont para 6)

d. Troubleshoots a variety of large commercial and industrial refrigeration, air conditioning and heating systems and supporting equipment.  (cont para 6)

e. Utilizes established safety practices, rules, regulations, and procedures to maintain a safe and clean work environment.  (con para 6)


4.  SUPERVISION RECEIVED (Name and title of person from whom incumbent receives direction)

Mr. Thomas Jones, 102 CES State Superintendent

a. (cont.) Systems include those with a variety of compressors and a variety of refrigerant controls.  Systems use a variety of complicated motor controls and other controls to protect against overload or overheating.  Calculates air flow and pressure-temperature characteristics.  Maintenance includes dismantling, repairing, reassembling, and testing units such as pumps, impellers, compressors, chillers, receivers, condensers, and evaporators.

b.  (cont.)  Performs preventative and scheduled maintenance on plant systems and equipment including boiler feed pumps, fuel oil pumps, air compressors, turbines, generators, steam traps, coal handling equipment, boiler controls and instrumentation, and combustion fans.  May work with complex burner management controls and examine electronic and electro-mechanical controls and support equipment for power boilers.  Uses specialized equipment to regularly adjust equipment to rigid tolerances. 

c.  (cont.)  Complexes contain special requirements such as communication centers, electronic data processing centers, laboratories, clean rooms, link training rooms, and other areas with sensitive equipment.

d.  (cont.)  Checks elements which control low and high side pressure; the temperature of the cooling units, liquid and

suction lines, and the running time of various mechanisms.  Checks for the probability of leaks by visual and

audible examination of equipment, by application of prescribed test procedures and equipment, and by

exploration of probable reasons for equipment failure.  Tests refrigeration, air conditioning, ventilation, and

related control systems and equipment.  Analyzes and isolates system malfunctions.  Tests pressure and

temperature of refrigeration and distribution systems.  Tests system operation and detects component

malfunctions.  Inspects and calibrates controls and gauges.

e.  (cont.)  Uses and assures proper fit of required safety equipment and clothing such as safety shoes, glasses, ear

protection, face masks, and/or hard hats.  Uses and maintains tools.  Maintains records and documents actions.


Works from instructions such as work orders, pre-repair inspection reports, user reports, standing operating procedures, or oral instructions which give an indication of the possible problems and the kinds and extent of repairs desired.  Examines, checks, and tests the systems and equipment; determines the type and extent of repairs needed; informs a supervisor of any extensive changes to previously specified or anticipated repairs and limitations; and completes approved work in accordance with existing guidelines or instructions.  Uses experience and judgment in determining why engines, electrical components, hydraulic or pneumatic systems, etc., fail to operate or meet performance specifications and requirements (e.g., power output, temperature, load, frequency, speed, and pressure) and in selecting best repair techniques.  Responsible for planning the sequence of repair tasks; selecting and safely using the proper tools, devices, and equipment; complying with appropriate specifications that clearances, fittings, adjustments, and settings are precise, and instructions in manuals, regulations, and guides; and ensuring they are made within designated clearances and tolerances.  Work may be observed while underway to check on progress and typically must pass an operational or diagnostic test upon completion.


Physical Effort

Performs work that involves frequent bending, reaching, crouching, standing, and arm movement.  Sometimes must work in awkward positions or cramped areas.  Must frequently lift and carry items weighing up to about 40 pounds and lift heavier items using jacks, hoists, or helpers.


 Working Conditions

May work inside or outside.  Inside work involves frequent exposure to drafts, changing temperature, and loud noise.  Outside work may ...

Commonwealth of Massachusetts

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