Course: HET 119 HVACR Electricity II

Lab Assignment

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Week 14 Lab Assignment: Troubleshooting Control Devices

Recommended Materials
1. Lab Sheet
2. Pencil and paper
3. HVAC Textbook
4. Internet Search
5. HVAC System

Scope

This lab will help the student to understand Control Devices and how it is used in electrical circuits and how to troubleshoot controls in HVAC/R system. The student will wire controls to loads in combination circuits.

Procedures

1. Use the diagram below, resolve the service problem.
2. If equipment is available, use it to help visualize the problem.
3. Have the instructor specify the controls you will need for this assignment.
  1. The problem: Air conditioning system is not blowing cold air from the supply registers.
  2. The compressor is not operating.
  3. The condenser fan motor is running.
  4. The indoor fan motor is operation.
  5. You measured 0 Volts across the contactor contacts.
  6. You measured 230 Volts across T1 and T2.
  7. The compressor is hot to touch.
Have the instructor to demonstrate the problem after you have completed your assignment.

Research Questions

1. What steps would you use to locate the problem? Be detail and itemize the steps. (Need voltage or resistance readings.)
2. Why do you believe this is the solution to the problem?

Click on the file below to download the Lab Assignment
- HET 119 Wk 14 Lab.docx (144.03 KB)