EPA EPA System Recovery and Evacuation Procedures

Question 1

What is the required recovery level (in inches of mercury vacuum) for systems with less than 200 pounds of refrigerant manufactured before November 15, 1993, when using recovery-only equipment made before that date?

Accepted Answer

4 inches Hg vacuum

Answer

0 psig

Answer

0 inches Hg (0 psig)

Answer

10 inches Hg vacuum

Question 2

Before opening a refrigeration system for major repairs, what must a technician do first?

Accepted Answer

Recover the refrigerant from the system

Answer

Add dye to locate leaks

Answer

Pressurize the system with nitrogen

Answer

Replace the filter drier

Question 3

What is the evacuation requirement for small appliances (systems containing 5 lbs or less of refrigerant) during recovery?

Accepted Answer

80% recovery if the compressor is not operating

Answer

90% recovery of refrigerant

Answer

80% or 4-inch vacuum depending on equipment manufacture date

Answer

No evacuation required for small appliances

Question 4

What is the primary purpose of deep evacuation before charging a refrigeration system?

Accepted Answer

To remove moisture and non-condensable gases from the system

Answer

To increase system efficiency by boosting pressure

Answer

To test the compressor's pumping capacity

Answer

To verify the refrigerant charge weight

Question 5

Which instrument is used to measure the vacuum level during system evacuation?

Accepted Answer

Electronic micron gauge (vacuum gauge)

Answer

Manifold gauge set only

Answer

Clamp-on ammeter

Answer

Sling psychrometer

Question 6

What does a 'standing vacuum test' verify after system evacuation?

Accepted Answer

That the system holds the required vacuum without rising, confirming no leaks or moisture

Answer

That the compressor can maintain vacuum during operation

Answer

That the refrigerant charge is correct

Answer

That non-condensables have been fully removed