To what temperature should the oil in a low-pressure chiller be heated before it is drained?
Recovery techniques · EPA 608 Type III. The correct answer, and the reasoning behind it.
Liquid then vapor, heating oil, protecting water tubes, and high-pressure cut-outs.
The question
To what temperature should the oil in a low-pressure chiller be heated before it is drained?
- 85 °F
- 130 °FCorrect answer
- 50 °F
- 180 °F
Why “130 °F” is correct
EPA's test topics call for heating the oil to 130 °F before removing it. Warm oil holds less dissolved refrigerant, so less refrigerant leaves with the oil.
Source: EPA: Test Topics
Why the other answers are wrong
- 85 °F — 85 °F is the boiling-point line used in the pressurization rule, not the oil temperature.
- 50 °F — 50 °F is too cool; the oil would still hold a lot of refrigerant.
- 180 °F — 180 °F is hotter than the accepted practice.
Practice more of this
More EPA 608 Type III practice questions, or see every EPA 608 practice test.
Unofficial, not affiliated with the EPA or any EPA-approved certifying organization. Questions are original practice written from public EPA material, not real exam questions.