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Operating Engineer Refrigeration

Operates Freon, carbon-dioxide, or ammonia gas-cooling systems to refrigerate rooms in establishments, such as slaughtering and meat packing plants and dairies, to air-condition buildings, or to provide refrigeration for industrial processes. : Opens valves on equipment, such as compressors, pumps, and condensers, to prepare system for operation and starts equipment and auxiliary machinery. Observes temperature, pressure and ampere readings for system and equipment and adjusts controls or overrides automatic controls to obtain specified operation of equipment. Records temperature, pressure, and other readings on log sheet at specified intervals. Measures density of brine, using hydrometer, and adds calcium chloride to lower temperature to specified degree. Connects hose from supply tank to compressor to replace coolant. Makes periodic inspections of equipment and system to observe operating condition and need for repair or adjustment. Adjusts controls to isolate and clear broken lines for repair or shuts down equipment. May repack pumps and compressors, clean condensers, and replace worn or defective parts using hand and power tools.

HVAC Mechanic

Installs, services, and repairs heating, ventilating, air conditioning systems, and related environmental-control systems utilizing knowledge of heating and 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 ensure efficient 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 15 to 20 tons of cooling capacity, in warehouses and factory buildings.

Repair Technician Automotive

Performs service and repairs that require skilled knowledge of specific components of a vehicle, but do not require all around knowledge of automobile repair. This description covers multi-discipline of automotive mechanics and service technicians, such as air conditioning mechanic, brakes mechanic, front-end mechanic, radiator mechanic, service station mechanic, and related automotive mechanics of comparable skill level. : Depending on the specialty, may perform certain duties listed below: Installs and repairs automotive air-conditioning units. Repairs and overhauls brake systems in automobiles, buses, trucks, and other automotive vehicles. Aligns wheels, axles, frames, torsion bars, and steering mechanisms of automotive vehicles, such as automobiles, buses, and trucks. Repairs cooling systems and fuel tanks in automobiles, buses, trucks, and other automotive vehicles. Inspects, maintains, and repairs certain components of automobiles and light trucks. Illustrative activities of an air conditioning mechanic follow: Measures compressor pressure to determine efficiency of compressor, using gauge. Listens to operating unit for indications of malfunction. Removes faulty units from vehicles, disassembles them, and replaces worn and broken parts and fluid in unit. Makes electrical connections as required. Illustrative activities of a brake mechanic follow: Diagnoses brake problems including computer and electronic controls. Removes wheels, using wrenches, wheel puller, and sledgehammer. Replaces defective brake shoe units or attaches new linings to brake shoes. Measures brake drum to determine amount of wear, using feeler gauge. Inserts vacuum gauge into power-brake cylinder, starts engine, and reads gauge to detect brake line leaks. Repairs or replaces leaky brake cylinders. Repairs or replaces defective air compressor in airbrake systems. Replaces wheel on axle and adjusts drum shoe clearance, using wrench. Fills master brake cylinder with brake fluid, pumps brake pedal, or uses pressure tank, and opens valves on hydraulic brake system to bleed air from brake lines. Closes valves and refills master brake cylinder. Illustrative activities of a front end mechanic follow: Drives automotive vehicle onto wheel alignment rack and tests vehicle for faulty wheel alignment, bent axle, worn ball joints, and bent steering rods, using alignment-testing machine. Straightens axle and steering rods and adjusts shims, tie rods, and joining pins to align wheels, or installs new parts, using hand tools. Places wheel on balancing machine to determine where counterweights must be added to balance wheel. Installs shock absorbers. Straightens frame, using hydraulic jack, chassis aligner, and acetylene torch. Illustrative activities of radiator mechanic follow: Pumps water or compressed air through radiator to test it for obstructions or leaks. Flushes radiator with cleaning compound to remove obstructions, such as rust or mineral deposits. Removes radiator core from automobile and cleans it, using rods or boiling water and solvent, or a combination of boil out and rod out. Solders leaks in core or tanks, using soldering iron or acetylene torch. Disassembles, repairs, or replaces defective water pump. Replaces faulty thermostats and leaky head gaskets. Installs new cores, hoses, and pumps. Cleans, tests, and repairs fuel tanks. Illustrative activities of service station mechanic follow: Repairs and services vehicles of service station customers. Removes and replaces parts of ignitions system, such as spark plugs, electronic modules, or alternator to complete tune-up or replace malfunctioning part of system, using mechanic's hand tools, gauges, and test meters. Replaces defective chassis such as shock absorbers, ball joint suspension, brake shoes, and wheel bearings. Refers major vehicle repairs to garage. May adjust carburetor and/or repair fuel injection system. May specialize in installation of automotive air-conditioning units.

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