EPA 608 Type III · Refrigeration Fundamentals · Medium
Why must low-pressure chillers be designed to be completely airtight?
Answer: A. Because they operate below atmospheric pressure.
- ABecause they operate below atmospheric pressure.✓ Correct
- BBecause the refrigerants are highly flammable.
- CBecause the oil rapidly degrades in sunlight.
- DBecause they use pure oxygen as a trace gas.
Why A is right
Operating in a vacuum means any leak draws air and moisture into the system, degrading performance.
More Type III questions
- Which HCFO refrigerant is replacing R-123 in new low-pressure chillers?
- Which of the following is considered a low-pressure refrigerant?
- Where is the rupture disc typically located on a low-pressure chiller?
- What is the primary purpose of a purge unit on a low-pressure centrifugal chiller system?
- Where does the purge unit take its suction from?
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.