HVAC

Occupational Title: HVACR Technician Key Purpose: Diagnose, install, service, and repair heating, ventilation, air conditioning and refrigeration systems.
Critical Work Function 2 Diagnose, install, troubleshoot, and repair electrical systems in HVACR equipment.		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.

KA2.1

Apply relevant principles in the selection, installation, and repair of electrical systems.

Number	Criteria
2.1.1	Application of both alternating and direct current theory to air conditioning, heating and refrigeration systems for power and/or control circuits.
2.1.2	Identify common single and 3-phase power and control circuits.
2.1.3	Wire series, parallel, and compound circuits utilizing the principles and relationships of Ohm's and Watt's laws.
2.1.4	Install correctly sized electrical conductors and properly rated insulation.
2.1.5	Install properly sized electrical circuit protection including fuses, circuit breakers, overloads and disconnect switches.
2.1.6	Inspect and test single and 3-phase transformers.
2.1.7	Select appropriate single and 3-phase transformers.
2.1.8	Install single and 3-phase transformers.
2.1.9	Ground electrical circuits properly.
2.1.10	Measure electrical current voltage and resistance.
2.1.11	Post-service performance audit of HVACR equipment indicates electrical systems operating at or above manufacturer’s design specifications, benchmarks, and baselines.

Knowledge and understanding of electrical theory and circuitry.

Knowledge and application of meter measurement.

Knowledge of Electrical Code Book (ampacity or wire, wire sizing, and grounding requirements).

Knowledge of Ohm’s Law for electrical calculations.

Read and apply wire diagrams, ladder, and pictorial schematics.

Ability to differentiate low voltage and high voltage circuits.

Appropriate hand tools

Digital multimeter

Lap-top computer

VOM multimeter

Megometer

NEC Handbook

Clamp-on ammeter

KA2.2

Select, install, and replace electrical motors.

Number	Criteria
2.2.1	Select electric motor based on manufacturer’s specifications for different uses and applications.
2.2.2	Install and replace various types of electric motors according to the requirement of the situation.
2.2.3	Install various types of capacitors according to the requirements of the situation.
2.2.4	Install electric motor protection devices.
2.2.5	Interpret electric motor specifications.
2.2.6	Post-service performance audit indicates electric motors operating at or above manufacturer’s design specifications, benchmarks, and baselines.

Knowledge and understanding of the design of electrical motors (shaded pole, split-phase, Permanent Split Capacitator-PCM, Integrally Controlled Motors -ICM, and 3-phase motors).

Ability to identify and interpret electric motor specifications and data plate information to replace motors.

Knowledge and application of various measuring instruments and testing devices.

Knowledge of voltmeter usage to determine proper voltage to motor.

Knowledge of ammeter usage to determine proper current draw.

Knowledge of Ohm meter usage to determine proper resistance in motor.

Appropriate hand tools

Wheel and pulley pullers

Capacitor tester

VOM multimeter

Megometer

Clamp-on ammeter

KA2.3

Wire and troubleshoot electrical controls.

Number	Criteria
2.3.1	Identify and wire safety and operation control devices; for example, pressure switches, thermostats, etc.
2.3.2	Identify and wire electromechanical control devices; for example, relays, contactors, magnetic starters, timers, sequencers, etc.
2.3.3	Identify and wire electronic control devices; for example, ignition modules, electronic timers, etc.
2.3.4	Wire both power and control circuits of an electric heat pump.
2.3.5	Wire both power and control circuits of air conditioned, heating, and refrigeration systems.
2.3.6	Wire low voltage controls for gas furnace.
2.3.7	Post-service performance audit indicates devices and circuits properly wired according to manufacturer’s design specifications, benchmarks, and baselines.

Knowledge and application of electrical control circuitry.

Knowledge and application of meter measurement.

Ability to identify pressure switches and electromechanical control devices.

Ability to read schematic drawings to check for proper wiring of high and low voltage controls.

Ability to read schematic drawings to apply voltmeter probes for testing of voltages at selected circuits.

Ability to use voltmeter to determine if power off to be able to Ohm out component and circuits for possible faults.

Ability to use ammeter while circuits energized to determine loads are energized.

Appropriate hand tools

VOM multimeter

Clamp-on ammeter