Under general supervision, installs, services and repairs all
components or sub-components of commercial and industrial heating,
ventilation, and air conditioning (HVAC) systems. Mechanics at this
level install, diagnose problems, and repair commercial and industrial
heat pumps and centralized air conditioning systems up to 250 tons
with multiple zone applications.
1. Installs, operates, services and repairs chiller plants with
tonnage application up to 250 tons. Diagnoses, tests, repairs
and replaces complex internal chiller controls and auxiliary
components of a total system.
2. Operates, services and repairs air handling and hydronic pumping
systems of various designs
3. Performs test and balance procedures to air and hydronic systems
to determine required adjustments. Makes adjustments to assure
optimal system operation.
4. Tests water in cooling towers; adds chemicals for control of
alkalinity algae and scale formation in condensers. Tests water
in closed loop systems; add chemicals to control corrosion and
5. Diagnoses, maintains, and performs service repairs to gas
burners. Replaces heat exchangers and component controls. Tests
and sets up burner operation to provide proper fuel to air
6. Maintains variable frequency drive applications on pumps and
7. Services and repairs humidification systems utilizing steam
and/or self-generated applications.
8. Services and repairs plumbing and electrical components of HVAC
9. Provides guidance and training in the HVAC trade to other
10. Performs all the duties of the Temperature Control Mechanic and
HVAC Mechanic I.
Note: The intent of this list of primary duties is to provide a
representative summary of the major duties and responsibilities of
this job. Incumbents perform other related duties assigned. Specific
duties and responsibilities may vary based upon departmental needs.
EDUCATION: High School Diploma or GED.
EXPERIENCE: Six years progressively responsible experience in any
combination of air conditioning, refrigeration, temperature control,
steam distribution, or heating trades.
Thorough knowledge of the principles of air conditioning and
refrigeration; of the practices and techniques used in the
installation, repair and maintenance of HVAC equipment and systems; of
refrigerant types, environmental impact, and gas reclamation
procedures and equipment. General knowledge of OSHA regulations
related to the refrigeration trade; of National Electric Code; of
basic mathematics including area, volume, and weights and the
practical application on fractions, percentages, ratios, and
proportions. Working knowledge of plumbing, steamfitting, and the
electrical trades as they pertain to HVAC systems. Skill in the
installation, repair and maintenance of commercial or industrial HVAC
equipment and systems; in the use and maintenance of tools and
equipment of the trade; in welding, brazing, soldering and silfoss; in
reading and interpreting blueprints, schematics, drawings,
specifications, and construction documents. Ability to read and
understand manufacturer's recommendations regarding scheduled and
preventive maintenance, servicing and operation; to use computers and
related software to diagnose HVAC system problems; to prepare written
reports; to communicate effectively both orally and in writing; to
work in, on, around, over and under fixed equipment and machinery; to
work at heights up to 35 feet; to manipulate heavy equipment, tools
and supplies and/or exert force up to 50 pounds; to concurrently
manipulate multiple controls on machinery or equipment; to work in
hazardous or irritating environments, confined spaces, and adverse
weather or temperature conditions; to wear and work in personal
OTHER: Except for qualifications established by law, additional
related experience and formal education in which one has gained the
knowledge, skills, and abilities required for full performance of the
work of the job class may be substituted for the education or
experience requirement on a year-for-year basis with 30 college
credits being equivalent to one year of experience.
CONDITIONS OF EMPLOYMENT
Candidates selected for employment may be subject to medical inquiries
and/or medical examinations to determine ability to perform the job.
Employees assigned to work with CFC refrigerants must maintain valid
certification in accordance with federal law. Valid Maryland
Non-commercial Class C or equivalent driver's license may be required.
Candidates selected for employment may be required to be trained to
work with asbestos.