MAJOR DUTIES

Diagnoses, locates and repairs malfunctions to the main operating mechanical components of large, complex heating, ventilation; air conditioning, and refrigeration systems (HVAC).

Disassembles and repairs a variety of components including compressors, evaporators, condensers, cooling coils, air handlers, bearings, water control valves, air dampers, etc. Lubricates moving parts and replaces air filters, v belts, electrical motors, pulleys, sheaves, bearings, fan shafts, etc. 30%

Tests for refrigerant leaks and uses a refrigerant recovery/ recycling station, to Environmental Protection Agency standards to safely reclaim, recycle and store the refrigerant before repairs can be made. 5%

Repairs HYAC systems and components in structures such as, warehouses, hangars, hospitals, large office buildings and complexes, including those with areas that have special requirements such as communication centers, electronic data processing centers, training rooms, and other areas with sensitive equipment. 5%

Conducts visual and audible examination of equipment components by applying prescribed test procedures and equipment, and by exploration of probable reasons for equipment failure. 10%

May dismantle, repair and reassemble units such as pumps, impellers, compressors, chillers, receivers, and evaporators. Performs complex repairs such as installing and fitting connecting rods, crank shafts, piston rings, bearings, and bushings; overhauling valves by adjusting or replacing gaskets, springs, floats, diaphragms, valve fittings, seals, and couplings; and aligning motors and flywheel drives. 20%

Uses all trade tools and test equipment and instruments including, voltage, amperage, and ohm meters, electronic refrigerant leak detectors, micron vacuum analyzers and pumps, electronic temperature gauges, capacitor analyzers, etc. 10%

Performs maintenance, calibration, modification, installation, repair and replacement of analog and direct digital controls (DOC) systems and equipment 20%

SKILL AND KNOWLEDGE

Knowledge and skill in the principles and theories of air conditioning and refrigeration such as, the refrigeration cycle, heat transfer laws, the use of refrigerant tables; how to calculate airflow, and the pressure-temperature characteristics for the different systems to locate problem; ability to recognize and determine the best method for correcting malfunctions; and skill to make repairs to a variety of heating, ventilation; air conditioning, and refrigeration systems.

Knowledge of refrigeration cycle of a variety of commercial and industrial systems to locate and check elements such as those which control low side and high side pressure; the temperature of the cooling units; the temperatures of the liquid and suction lines; and the running time of the various mechanisms.

Knowledge of HVAC systems components such as compressors which include gear, reciprocating, centrifugal, or rotary pump, and a variety of refrigerant controls such as those with low and high pressure side floats, automatic thermostatic expansion valves, capillary or choke types, and those based on volume or quantity changes. In addition, knowledge of systems which have a variety of complicated motor controls such as hermetically sealed motors and pressure controls, thermostatic motor controls (remote and double remote), full and semi-automatic defrosting controls, relays, and other controls to protect against overload or overheating.

Knowledge of power sources are used with various combinations or pulleys, belts, horse power capacity, and tensioners.

Skill to conduct visual and audible examination of equipment components, by applying prescribed test procedures and equipment; and by exploration of probable reasons for equipment failure.

Knowledge of the analog control systems or knowledge of the direct digital controls (DOC) for the automated control of HVAC systems. Knowledge of DOC devices and software including programmable logic controllers, computers and peripherals which provide a centralized computer network-oriented approach. Knowledge of electrical control systems and automated logic systems.

Skill to conduct examinations, diagnose malfunctions and make repairs to HVAC systems and the analog and/or direct digital control (DOC) systems used in complex heating, ventilation; air conditioning, and refrigeration systems.

RESPONSIBILITY

Assignments are made by the supervisor through instructions or work orders and may include building plans, shop sketches, or blueprints. Mechanics plan the test procedures, determine the proper kind and type of parts and equipment needed, and install and repair a variety of systems with little or no check during the progress of the assignment. Completed work may be checked to ensure compliance with requirements.

PHYSICAL EFFORT

Physical effort is required to maneuver equipment in and out of specific locations while dismantling and reassembling. The work requires frequent carrying and setting-up of parts and equipment that may weigh up 50 pounds. Hoists, holders, and pulleys are operated when removing units such as large compressors, condensers, and chillers. The work requires making repairs and installations from ladders, scaffolding and platforms where the parts of systems worked on are frequently in hard-to-reach places; therefore, stooping, stretching, bending, and kneeling are frequent and may be for long periods of time.

WORKING CONDITIONS

Works both inside and outside, on top of tall buildings, in drafty attic spaces, and in cramped areas with low overheads. Personal protective equipment such as protective clothing, helmets, goggles, respirators, etc. may be required to be worn when there is a possibility of exposure to toxic refrigerants during regular maintenance and repair or when making emergency repairs.

OTHER REQUIREMENTS

May be subject to one or more of the following requirements:

1. Shift work may be required.

2. Emergency overtime may be required

3. Valid driver's license

4. CFC/HFC Certification (Universal) as required by the Environmental Protection Agency (EPA) - may be obtained upon employment

5. Recall to duty may be required

Job Type: Full-time

Pay: $29.00 - $37.28 per hour

Benefits:

• Dental insurance
• Health insurance
• Paid time off
• Vision insurance

Schedule:

• Day shift
• Evening shift
• Monday to Friday
• Night shift
• Weekend availability

Ability to commute/relocate:

• Indian Head, MD 20640: Reliably commute or planning to relocate before starting work (Required)

Application Question(s):

• Shift work may be required
• Must be Able to lift 50 lbs

Experience:

• HVAC: 1 year (Required)

License/Certification:

• EPA Type II (Preferred)
• Driver's License (Required)

Work Location: In person

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