HVAC

Occupational Title: HVACR Technician Key Purpose: Diagnose, install, service, and repair heating, ventilation, air conditioning and refrigeration systems.
Critical Work Function 4 Utilize refrigeration principles and practices.		Occupational Skills, Knowledge and Conditions
Key Activities	Performance Criteria	Occupational Skills and Knowledge	Conditions
Those duties or task clusters that are necessary to perform each critical work function.	Specific demonstrable performance and standards that indicate when the key activity has been performed successfully.	Those skills and knowledge that are specific to the occupation, such as technical processes or procedures common across the occupation that are critical to the related key activity.	Tools, resources and equipment necessary to carry out key activities and their related performance criteria.

KA4.1

Diagnose refrigeration systems by applying appropriate theories.

Number	Criteria
4.1.1	Apply theory of heat transfer in the diagnosis of refrigeration systems.
4.1.2	Apply the properties of different refrigerants in different applications.
4.1.3	Apply proper diagnostics to the refrigeration cycle of a mechanical system.
4.1.4	Utilize pressure, temperature curves and charts to solve problems.

Knowledge of refrigeration system principles and circuitry.

Understanding of theory of heat transfer.

Knowledge of Boyles Law.

Knowledge of Chale’s Law.

Knowledge of Dalton’s law.

Knowledge of 1st and 2nd Law of Thermo-Dynamics.

Knowledge and interpretation of pressure/temperature relationships to convert pressures and temperatures of refrigerants and to identify appropriate refrigerants for application.

Ability to read and apply enthalpy charts.

Appropriate hand tools

Refrigerant manifold gauge with hoses

Digital thermometer

KA4.2

Select, install, maintain, and repair refrigeration system components.

Number	Criteria
4.2.1	Select compressors, condensers, metering devices, and evaporators.
4.2.2	Install compressors, condensers, metering devices, and evaporators.
4.2.3	Inspect and test compressors, condensers, metering devices, and evaporators.
4.2.4	Repair compressors, condensers, metering devices, and evaporators.
4.2.5	Post-service performance audit of HVACR equipment indicates refrigeration system components operation at or above manufacturer’s design specifications, benchmarks, and baselines.

Knowledge and understanding of four major refrigeration system components (compressors, condensers, metering devices, and evaporators).

Knowledge and understanding of evacuation.

Knowledge and application of various measuring instruments and testing devices.

Understanding of proper procedures for oxy/acetylene welding.

Appropriate hand tools

VOM multimeter

Refrigerant manifold gauges

Electronic temperature stations

2-stage vacuum pump

Micron gauge

Oxy/acetylene welding set

Leak detector

Ammeter

KA4.3

Select, install, maintain, and repair refrigeration system accessories.

Number	Criteria
4.3.1	Select refrigeration system accessories; for example, receivers, accumulators, filter/dryers, sight glasses, valves, etc.
4.3.2	Install refrigeration system accessories; for example, receivers, accumulators, filter/dryers, sight glasses, valves, etc.
4.3.3	Maintain refrigeration system accessories; for example, receivers, accumulators, filter/dryers, sight glasses, valves, etc.
4.3.4	Repair refrigeration system accessories; for example, receivers, accumulators, filter/dryers, sight glasses, valves, etc.
4.3.5	Post-service performance audit of HVACR equipment indicates refrigeration system accessories operating at or above manufacturer’s design specifications, benchmarks, and baselines.

Knowledge and understanding of evacuation procedures.

Knowledge and application of various measuring instruments and testing devices.

Understanding of proper procedures for oxy/acetylene welding.

Appropriate hand tools

VOM multimeter

Refrigerant manifold gauges

2-stage vacuum pump

Micron gauge

Oxy/acetylene welding set

Leak detector

Ammeter