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48

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:

Plotting the refrigeration cycle on a pressure enthalpy chart

Defining SEER and EER

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

Sizing, designing, and installing refrigerant lines

Installing a condensing unit

Installing an air handler

Describing the required CFM for system operation and calculate air flow

Installing a condensate drain

Defining reclaim

Defining and demonstrating refrigerant recycling

Defining and demonstrating refrigerant recovery

Explaining the proper use and handling of nitrogen in the leak detection process

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 system

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 system

Identifying proper charging of a blended refrigerant into an operating system

Demonstrating charging using the subcooling method

Demonstrating charging using the superheat method

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

Defining vacuum and vacuum levels as required in the HVACR industry

Obtaining gauge pressure using compound gauges and convert to absolute

Describing the operation and use of a gauge manifold assembly

Identifying and differentiate between the various types of service valves

Defining compression ratio

Describing the automatic pump-down system and its operation

Describing an air cooled condenser, its function, and operating parameters

Installing water cooled system and adjusting a water regulating valve