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47

Competency and Task List

Students should

have prior

knowledge of:

Leak detectors

The laws of Thermodynamics

Recovery and recycling processes

Refrigerant leak detection and types of leak detectors

Refrigerant piping

Soldering and brazing

Refrigerant types

System components such as:

Metering devices

Receivers

Pressure controls

Suction accumulators

Refrigerant flow and control valves

Evacuation methods and equipment

Refrigerant charging methods

Light Commercial Air Conditioning

Students must

have knowledge

of light

commercial air

conditioning

systems, their

components,

and be able to

demonstrate

proficiency in:

Defining enthalpy and entropy

Change of state between liquids, vapor, and solids

Describing and defining the following; conduction, convection and radiant heat transfer

Describing, defining, and converting the following temperature measurements; Fahrenheit,

Celsius, Rankine, and Kelvin

Condensation of a vapor, and its effect on heat

Vaporization of a liquid, and its effect on heat

Describing the thermodynamics of refrigerants

Describing and defining the following; BTU, latent heat, sensible heat

Describing and defining the following; subcooled liquid, superheated vapor

Describing the state of refrigerant, and explain what occurs in each major component during

normal operation

Using saturation tables

Identifying and defining the following types of blends; Binary, Ternary, Azeotropic, and Near

Azeotropic

Identifying and defining; CFC’s, HCFC’s, HFC’s, HFO's & HC's

Describing temperature glide

Describing fractionation and its causes

Explain the procedures to retrofit a system from a CFC to an HFC, & an HCFC to an HFC

Describing and defining the following; wet bulb temperature, dry bulb temperature, and dew

point

Defining wet bulb depression

Measuring wet and dry-bulb temperatures

Describing the principles of dehumidification and humidification