Under general supervision, installs, services and repairs a variety of
residential and commercial heating, ventilation, air conditioning and
refrigeration (HVAC) equipment. Mechanics at this level install and
service residential and commercial heat pumps and industrial
centralized air conditioning systems up to 100 tons. Systems may
contain several zones.
1. Installs, operates, services, and repairs light commercial heat
pump/air conditioning systems and other HVAC equipment such as
refrigerators, fumehoods, window units, exhaust ventilators,
coolers, deep freezers, and unit ventilators.
2. Operates, services, and repairs pneumatic, electric, or
electronic control systems on HVAC systems up to 100,000 gross
square feet (GSF).
3. Regulates and monitors air conditioning compressors, cooling
tower fans and other related support equipment as prescribed by
4. Regulates and monitors all building air handling equipment for
central and local stations.
5. Tests air and hydronic systems to isolate problems. Adjusts
distribution valves and resets temperature and humidity controls
for steam supplied and self contained generation systems.
6. Performs service tasks such as adding refrigerant, lubricating,
adjusting and replacing compressors and expansion devices,
repairing pumps, cleaning out cooling towers and repacking valve
glands and pump seals.
7. Installs and reinstalls wiring and controls to connect components
and controls to electrical power sources at low line voltage.
8. Diagnoses HVAC system problems utilizing computer applications.
Reviews mechanical blueprints, schematics, specifications, and
performance data to indentify and provide interpretations of
system problems and performance.
9. Provides guidance and training in the HVAC trade to other
10. Services and repairs traps, flash tanks, piping, control valves,
condensate pumps and meters on steam systems up to 30 pounds.
11. Performs mechanical joining of piping by using industry methods
such as soldering, brazing, and gas welding. Insulates piping
and mechanical equipment such as heat exchangers and associated
subsystems. Performs insulation repairs to air duct systems.
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: Four years progressively responsible experience in the air
General 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, enviromental impact, and gas reclamation procedures
and equipment. Working 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 of
fractions, percentages, ratios, and proportions. Skill in the use and
maintenance of the tools and equipment of the trade; in welding,
brazing, soldering, and silfoss; skill in repairing and servicing HVAC
equipment and systems. Ability to read and interpret blueprints,
schematics, drawings, specifications, and construction documents; 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
reports; 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 lbs.; 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 protective
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.