HVAC Mechanic II - Continued Page 2
IMPERIAL COUNTY
CLASS TITLE: HVAC MECHANIC II
BASIC FUNCTION:
Under the direction of a Maintenance Supervisor II-Mechanical, perform skilled mechanical maintenance duties in the inspection, repair, installation and alteration of large County heating, ventilation, air conditioning and refrigeration systems, cooling towers, chilled water systems and related equipment and facilities; perform preventative maintenance and routine servicing of equipment and systems.
DISTINGUISHING CHARACTERISTICS:
The HVAC Mechanic II classification is the advanced class in the series. Incumbents work on large heating units of 60 to 175-ton size and 40 million BTU low-pressure boilers. The HVAC Mechanic I classification is assigned to maintain and repair smaller HVAC equipment and systems. Incumbents work on gas, electrical and self-contained heating units of one to ten-ton size.
REPRESENTATIVE DUTIES:
Conduct regular preventive maintenance inspections of water towers, chilled water systems, large refrigeration units, and low-pressure boilers, isolated heating and ventilating units, including water heaters, gas and electrically operated air-conditioning equipment and walk-in refrigerators and freezers; perform necessary adjustments or repairs; service and repair evaporative coolers.
Inspect, repair, modify and install HVAC equipment including refrigeration and air
conditioning compressors, receivers, condensers, chillers, water cooling towers, forced air converter units, pumps, automatic and hand valves, expansion valves and capillary tubes.
Repair or replace defective parts in units and equipment and their controls, including
thermostats, automatic switches, fan controls, log switches, damper motors, louvers,
relays, filters, controls, log switches, damper motors, louvers, relays, filters, controls, belts, compressors, heat exchangers, high-limit controls, pressure controls, safety valves and automatic gas valves.
Lubricate and pack heating, ventilation, refrigeration, and air-conditioning motors, pumps,
fans, and other equipment; clean water towers and paint periodically.
Install and calibrate systems; install copper tubing and repair pipes and tubing as
necessary; test joints and insulate pipes of refrigeration and air conditioning systems;
flush boilers, descale tubing and cut and thread pipes; rebuild pressure and temperature
safety valves and water pumps.
Repair and maintain furnace gas controls and engines, filters and condensing units;
inspect, detect and repair leaks; check and replace thermo-couples and pilot generators;
clean and adjust pilots.
Operate a tractor, backhoe, boom truck, automotive vehicles, fork lift, welding equipment,
cutting torch, a variety of hand and power tools, vacuum pump and test equipment utilized
in the trade.
Perform skilled electrical maintenance work in the repair, installation and alteration of
electrical equipment, components, timers, motors, relays, wiring systems, lights and
receptacles as needed; connect motors to control panels and panel to power sources.
Perform ARC and acetylene welding to repair cracks and leaks in systems and to
fabricate stands and braces.
Diagnose mechanical and electrical problems; repair or replace defective parts in units,
equipment and controls; dig trenches to locate, repair and replace wiring, pipes and parts
as needed.
Install, rebuild, replace or repair fans, motors, thermostats, fuses, filters, bearings, valves,
controls, gaskets and other equipment as necessary.
Maintain related records concerning inspections, work orders and equipment logs;
purchase materials and parts as needed.
Assist other skilled maintenance personnel in cooperative assignments as needed.
Train, assign and review work of other maintenance personnel and jail trustees as assigned.
Perform related duties as assigned.
KNOWLEDGE AND ABILITIES:
KNOWLEDGE OF:
Advanced practices of the HVAC and refrigeration trade.
Theory of HVAC and refrigeration systems.
Materials, methods and tools used in the operation and repair of HVAC and
refrigeration systems.
Applicable building codes, ordinances and regulations of State and local authorities
pertaining to HVAC and refrigeration.
Air compressors and pneumatic controls.
Cooling towers and boiler water treatment.
Manual and electrical tools and equipment applicable to the HVAC and refrigeration
trade.
Welding and soldering techniques.
Health and safety regulations.
Basic record-keeping techniques.
Proper methods of storing equipment, materials and supplies.
ABILITY TO:
Perform skilled mechanical maintenance duties in the inspection, repair, installation
and alteration of County heating, ventilation, air conditioning and refrigeration
systems, cooling towers and related equipment and facilities.
Calibrate systems.
Perform preventive maintenance and routine servicing of equipment.
Diagnose defects, and install, repair and maintain heating, ventilating, refrigeration,
and air-conditioning units.
Interpret and work from plans, diagrams, and specifications.
Follow oral and written instructions.
Operate heavy and specialized machinery, equipment and tools utilized in the repair,
installation and maintenance of heating, ventilation, air-conditioning and
refrigeration systems.
Read and work from blueprints, shop drawings and sketches.
Communicate effectively both orally and in writing.
Understand and follow oral and written directions.
Work cooperatively with others.
Work independently with little direction.
Meet schedules and time lines.
Maintain routine records.
Perform heavy physical labor.
Observe legal and defensive driving practices.
EDUCATION AND EXPERIENCE:
Any combination equivalent to: three years journey-level experience in the HVAC
and refrigeration trade including one year of experience maintaining chilled water systems and large cooling units.
LICENSES AND OTHER REQUIREMENTS:
Valid California driver's license. Incumbents in this classification must pass a law
enforcement security check.
WORKING CONDITIONS:
Indoor and outdoor environment; subject to driving a vehicle to conduct work.
Physical abilities required include lifting heavy objects, climbing, bending, pushing and pulling, dexterity of hands and fingers to operate hand and power tools, seeing to maintain systems, climbing ladders, and kneeling or crouching.
Incumbents may be exposed to freon fumes, high voltage electric current, noise, and extreme heat.
October 1992