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Competency and Task List

Students must have knowledge of

light commercial refrigeration sys-

tems, their components, and be able

to demonstrate proficiency in:

Describing, explaining the function, evaluating, cleaning, and replacing (when

feasible) of the following components:

Compressors (reciprocating, scroll, rotary, and screw)

Condensers air cooled

Condensers water cooled

Metering devices (capillary tube, thermostatic expansion valve, automatic

expansion valve, electronic expansion valve)

Refrigerant distributors and feeder tubes



Discharge line

Liquid line

Suction line

Liquid line filter

Sight glass

Suction line filter

Vibration eliminator


Head pressure controls

Low pressure controls

Pump down solenoid

Oil separator

Crankcase heater


Lockout relay


Oil pressure safety control

Current start relay

Defrost heater

Defrost terminator

Mechanical or electronic defrost timer

Crankcase pressure regulator (CPR)

Liquid line solenoid valve

Evaporator pressure regulator (EPR)

Pressure regulator (OPR)

Ambient temperature controls

Water regulating valve

Plotting the refrigeration cycle on a pressure enthalpy chart

Defining SEER and EER

Describing a cascade system its application and operation

Describing the purpose and applicability of a defrost cycle

Describing defrost cycle initiation and termination

Describing the basic cycles and operation of ice makers

Describing a Head Master and its operation

Describing the function, selection and installation of auxiliary heat exchangers

Select the proper refrigerant oil add to an operating system

Adjusting blower fan speed

Commercial Refrigeration