EPA 608 Type III · Refrigeration Fundamentals · Easy
What is the primary purpose of a purge unit on a low-pressure centrifugal chiller system?
Answer: A. To remove non-condensable gases and air from the system.
- ATo remove non-condensable gases and air from the system.✓ Correct
- BTo mix liquid and vapor refrigerant during charging.
- CTo increase the compressor speed during peak load.
- DTo vent excess refrigerant to the atmosphere safely.
Why A is right
Because low-pressure chillers operate in a vacuum, air and moisture leak inward. The purge unit constantly removes these non-condensable gases to maintain efficiency.
More Type III questions
- Where does the purge unit take its suction from?
- What does frequent operation of the purge unit indicate?
- Why must low-pressure chillers be designed to be completely airtight?
- Which HCFO refrigerant is replacing R-123 in new low-pressure chillers?
- Which of the following is considered a low-pressure refrigerant?
Go deeper with the study guide EPA 608 Core Exam: Study Guide for 2026, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.