Course: HET 119 HVACR Electricity II

Unit 15 Outline

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Unit 15 Outline

1. Safety First
  1. Using Personal Protect Equipment (PPE)
  2. Using Lock Out, Tag Out (LOTO)
  3. Using Caution when Working with Live Power
2. What is Troubleshooting
  - Critical Thinking Skills
  - Knowledge of the Equipment
3. Steps in the Troubleshooting  Process
  - Using Manufacture’s Flow Charts
  - Asking the Right Questions
  - Using Your Senses
  - Breaking the System into Smaller Systems
  - Eliminating the Un-needed Information
  - 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
  - Knowing the Sequence of Operation is Critical

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