Course: HET 111 HVACR Electricity I - Spring 2015

Lab Assignment

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Lab Assignment

Please read Read Units 22 & 10 in the Refrigeration & Air Conditioning Technology Text and complete the following Lab:

OBJECTIVE: Upon completion of this exercise, you will have a better understanding of the role potential relays plays in the starting of HVAC compressors.

INTRODUCTION: You should carefully review lecture notes and PowerPoint for Potential relays. This will give you a good background for most of the procedures in this exercise. Email your instructor about anything of which you are unsure.

READING REFERENCE: Potential Relays

TOOLS AND MATERIALS: You will need an A/C unit, a meter, a notepad, your notes, and this lab sheet to complete the exercise.

SAFETY PRECAUTIONS: Always ware safety glasses when working in the lab or out in the field

PROCEDURES:

1. Choose an A/C unit
2. Unplug the unit
3. Study the wiring for the potential relay
4. Make a drawing of the connections
5. Call you instructor over to review your work
6. Have your lab partner remove the wires on your unit
7. Replace the wires
8. Call you instructor over to review your work
9. Plug in the unit and turn it on
10. Repeat this lab on four other units
11. Clean up your work area and return the tools to their proper location