Title: (Optional) Purge air from a hydronics system (e.g., radiators).
Course: Heating, Ventilation, Air Conditioning, and Refrigeration II (17056-II) > Section: Servicing and Maintaining Alternative Fuel Heating Systems

Purging should include

- using water keys
- locating purge points
- purging the expansion tank.

Process/Skill Questions:

- How does air get into the system?
- How does air affect the system?
- What is the purpose of the expansion tank?