At what pressure is the high-pressure cut-out typically set on a recovery device used with low-pressure appliances?

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

At what pressure is the high-pressure cut-out typically set on a recovery device used with low-pressure appliances?

• A10 psigCorrect answer
• B5 psig
• C15 psig
• D35 psig

Why “10 psig” is correct

EPA's test topics ask for this cut-out level, and trade training gives it as 10 psig. The low setting keeps the recovery unit from pushing a chiller or low-pressure recovery vessel toward its rupture disc, which is commonly set at 15 psig. Recovery units built for higher-pressure refrigerants cut out at hundreds of psig.

Source: EPA: Test Topics; Trane CVHE-SVX005E-EN, CenTraVac IOM (15 psig rupture disk)

Why the other answers are wrong

• 5 psig — 5 psig is the oil-change limit in the regulation, not the cut-out setting.
• 15 psig — 15 psig is the typical rupture disc setting that the cut-out is meant to stay below, not the cut-out itself.
• 35 psig — 35 psig is far above the setting used for low-pressure recovery.

Practice more of this

More EPA 608 Type III practice questions, or see every EPA 608 practice test.