Title: Diagnose a contactor for repair or replacement.
Course: Heating, Ventilation, Air Conditioning, and Refrigeration II (17056-II) > Section: Understanding Motors and Controls

Diagnosis should include

- selecting the size and type of contactor
- checking voltage on the coil
- checking voltage loss across the contacts
- replacing the contactor as needed.

Process/Skill Questions:

- What is the voltage of the coil?
- What safety procedures should be followed?
- What is the National Electrical Code (NEC)?
- What happens if you install a coil with the incorrect voltage rating?