23400 HEATING, REFRIGERATION AND AIR-CONDITIONING MECHANIC
Installs, services and repairs environmental-control systems in
residences, department stores, office buildings and other commercial
establishments, utilizing knowledge of refrigeration theory, pipefitting
and structural layout. Mounts compressor and condenser units on platform
or floor, using hand tools, following blueprints or engineering
specifications. Fabricates, assembles and installs ductwork and chassis
parts, using portable metalworking tools and welding equipment. Installs
evaporator unit in chassis or in air-duct system, using hand tools. Cuts
and bends tubing to correct length and shape, using cutting and bending
equipment and tools. Cuts and threads pipe, using machine-threading or
hand-threading equipment. Joins tubing or pipes to various refrigerating
units by means of sleeves, couplings or unions, and solders joints, using
torch, forming complete circuit for refrigerant. Installs expansion and
discharge valves in circuit. Connects motors, compressors, temperature
controls, humidity controls and circulating ventilation fans to control
panels and connects control panels to power source. Installs air and water
filters in completed installation. Injects small amount of refrigerant
into compressor to test systems and adds freon gas to build up prescribed
operating pressure. Observes pressure and vacuum gauges and adjusts
controls to insure proper operation. Tests joints and connections for gas
leaks, using gauges or soap-and-water solution. Wraps pipes in insulation
batting and secures them in place with cement or wire bands. Replaces
defective breaker controls, thermostats, switches, fuses and electrical
wiring to repair installed units, using electrician's hand tools and test
equipment. May install, repair and service air conditioners, ranging from
fifteen to twenty tons cooling capacity, in warehouses and small factory
buildings.
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