EPA 608 609 Type III 3

Question 1

When recovering refrigerant from a low-pressure appliance for major repair, the required recovery level depends on:

Accepted Answer

Whether recovery/recycling equipment was made before or after Nov 15, 1993

Answer

Required recovery vacuum levels differ for equipment manufactured before versus after November 15, 1993.

Question 2

Recovery equipment manufactured after November 15, 1993, must evacuate a low-pressure appliance to:

Accepted Answer

25 mm Hg absolute

Answer

Post-1993 recovery equipment must achieve 25 mm Hg absolute on low-pressure appliances.

Question 3

A potentially dangerous condition when adding nitrogen to pressurize a low-pressure system for leak testing is exceeding:

Accepted Answer

10 psig

Answer

Low-pressure appliances should not be pressurized above 10 psig, as higher pressures can cause a violent rupture.

Question 4

To raise system pressure for leak detection in a low-pressure chiller, a technician may safely use:

Accepted Answer

Nitrogen with a trace of refrigerant, kept below 10 psig

Answer

A trace of refrigerant in nitrogen below 10 psig is used to detect leaks safely.

Question 5

Why should oxygen never be used to pressurize a refrigeration system for leak testing?

Accepted Answer

It can react explosively with compressor oil

Answer

Oxygen can combine with oil and cause a violent explosion.

EPA 608 609 Practice Test