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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:

Sizing, designing, and installing refrigerant lines

Describing a service valve and its operation

Determine refrigerant line pressure drop and explain the effects of pressure

drop on a system

Describing proper soldering and brazing techniques

Describing the function, selection and installation of a vibration eliminator

Describing the design structure, function, operation, and selection of refrig-

erant distributors and feeder tubes

Installing a medium temperature condensing unit

Installing a low temperature evaporator with electric defrost

Describing the required CFM for evaporator operation and calculate air flow

Installing a condensate drain for a low temperature system

Describing a drain and drain pan heater and their operation

Defining reclaim

Defining and demonstrating refrigerant recycling

Defining and demonstrating refrigerant recovery

Explaining the proper use and handling of nitrogen in the leak detection pro-


Explaining the method for and pinpointing a leak

Explaining the proper use of each type of leak detector and their applicability

Describing the six types of leak detectors and demonstrating the proper use

Identifying proper charging of a compound refrigerant into an operating sys-


Identifying proper charging of a compound refrigerant into an empty system

Determine superheat and subcooling on an operating system

Describing and preforming a compressor efficiency test

Select the proper refrigerant oil and add it to an operating system

Describing the following oils and their applications; Mineral, Alkylbenzene,

Glycols, and Esters

Demonstrating charging a mini-split system with two or more evaporators

Demonstrating charging using the manufacturers literature

Identifying proper charging a blended refrigerant by weight into an empty


Identifying proper charging of a blended refrigerant into an operating system

Demonstrating charging using the subcooling method

Describing the proper procedure for measuring and adjusting evaporator su-


Stating the reason why capillary tube systems require a critical charge

Describing a capillary / distributor tube sizing and selection procedure

Calculating and demonstrating the weigh-in charging method

Describing the triple evacuation method

Demonstrating the triple evacuation method

Soldering and brazing using correct techniques

Evacuating and measuring system evacuation level

Explaining vacuum pump selection

Identifying the types of micron gauges and how they should be connected to

measure evacuation levels

Obtaining gauge pressure using compound gauges and convert to absolute

Commercial Refrigeration