Course: HET 119 HVACR Electricity II

Unit 14 Outline

page 1
Unit 14 Outline

1. Safety First
  - Using Personal Protect Equipment (PPE)
  - Using Lock Out, Tag Out (LOTO)
  - Using Caution when Working with Live Power
2. What is Troubleshooting
  - Critical Thinking Skills
3. Steps in the Troubleshooting  Process
  - Using a Voltmeter
  - Using a Amp-meter
  - Using a Ohm-meter
  - Using a Thermometer
  - Locating the source of the Problem
4. Making the Repairs
  - Developing Craftsmen Skills
  - Developing Mechanical Skills
  - Replacing the Correct Component
5. Testing the System
  - After making the repairs, what’s next

Summary

- Troubleshooting is an Art and a Science. Troubleshooting is a logical process but it takes time to develop the skills needed to analyze problems.
- A technician must develop critical thinking skills to be competent in diagnosing HVAC/R systems.
- A HVAC/R technician must understand how a HVAC/R system component operates.
- A technician should have a working knowledge of both controls and controlled devices.
- A technician needs to know how to properly use test equipment and tools.
- When using a voltmeter to check open circuits, when the switch is in the closed position, the voltmeter will read zero voltage.
- When using a voltmeter to check open circuits, when the switch is in the open position, the voltmeter will read whatever the applied voltage is.
- Ohm can be used to check for open circuits; however, the voltage must be turn off to keep from damaging the meter.

Review the vocabulary terms listed below and look up their definitions / descriptions before taking the Vocabulary Quiz.

Vocabulary

- Troubleshooting
- Craftsmanship
- Test Equipment
- Voltmeter
- Amp-meter
- Ohm meter