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49

Competency and Task List

Light Commercial Air Conditioning

Students must have

knowledge of light

commercial air

conditioning systems,

their components, and

be able to demonstrate

proficiency in:

Describing the function of, and install a lockout relay in a circuit

Describing the operation of and install a contactor

Describing, test, and install a run and start capacitor

Describing and install a compressor potential start relay

Describing the operation of and test a high pressure switch

Describing the operation of and test a low pressure switch

Describing and wire the terminal connections of a thermostat temperature control

Describing and test thermistor type temperature sensors (PTC & NTC)

Describing the function, check the operation, and wire an oil pressure safety control

Installing and adjusting a low ambient temperature control

Test a blower or fan motor and its circuit

Describing the operation of and test a hot gas bypass valve

Describing the operation of and adjust an inline, and pilot operated evaporator pressure regulator

Describing and installing a replaceable core liquid line drier

Describing and install a replaceable core suction line filter drier

Describing dry type evaporators and their operation

Describing the piping configuration for a multiple evaporator systems

Describing the function and purpose of a multiple compressor system

Compressor capacity control methods and operation

Describing a chilled water system and its operation

Describing cooling towers and their operating limitations

Describing the operation and function of a flooded evaporator and its metering device

Describing the function, check the operation, and wire a demand ventilation control

Describing the function, check the operation, and wire communications type thermostat

Describing the function, check the operation, and install a variable volume air handler

Describing the function, check the operation, and install a variable air volume (VAV) unit

Students should have

knowledge of and be

able to describe and

demonstrate the

following safety

Describe and perform “Lock out and Tag” procedures

System leak-test pressures and nitrogen regulator installation and adjustment

Explain and demonstrate the proper method of connecting a micron gauge to the system

Light Commercial Air

Conditioning

troubleshooting and

problem solving:

Troubleshooting and Problem Solving involves diagnostic procedures requiring the use of test

equipment, manufacturers’ installation and start up procedures, and data plate information.