313D Refrigerant Handling and Recovery 3

Question 1

During system-dependent (passive) recovery, refrigerant is transferred using:

Accepted Answer

The system's own compressor to push refrigerant into recovery cylinders

Answer

System-dependent recovery uses the appliance's own compressor to pump refrigerant into recovery cylinders without an external machine.

Question 2

What evacuation level is required before opening a system for major repairs on equipment manufactured after November 15, 1993, using a recovery machine manufactured after that same date?

Accepted Answer

4 inches Hg vacuum

Answer

For equipment manufactured after November 15, 1993, using a post-1993 recovery machine, the required evacuation level before major repairs is 4 inches of mercury vacuum.

Question 3

R-22 refrigerant recovered from a system and later found to be contaminated must be:

Accepted Answer

Reclaimed to AHRI 700 purity standards or sent to a certified reclaimer

Answer

Contaminated refrigerant must be reclaimed to AHRI 700 purity standards by an EPA-certified reclaimer before it can be resold or reused in a different system.

Question 4

A recovery cylinder must be hydrostatically tested and replaced or retested no more than how many years after the original test date stamped on the collar?

Accepted Answer

5 years

Answer

DOT-compliant recovery cylinders must be re-qualified (hydrostatically retested) every 5 years from the date stamped on the collar.

Question 5

What is the safest procedure when connecting manifold gauge hoses to recover refrigerant from a potentially pressurized system?

Accepted Answer

Attach hoses with valves closed, then slowly open system service valves

Answer

Connecting hoses with manifold valves closed prevents accidental release of refrigerant and controls the rate at which system pressure enters the hoses.

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

313D Refrigerant Handling and Recovery 3