313D Refrigerant Handling and Recovery 2

Question 1

Under EPA Section 608, what is the maximum allowable leak rate for a residential comfort cooling system containing 50 or more pounds of refrigerant before repair is required?

Accepted Answer

15% per year

Answer

EPA Section 608 sets the leak rate threshold for comfort cooling appliances at 15% of the total charge per year before a repair is mandated.

Question 2

Which refrigerant cylinder color code is used to identify R-410A?

Accepted Answer

Rose/pink

Answer

R-410A cylinders are color-coded rose/pink per ARI Standard 700 to distinguish them from other refrigerants.

Question 3

A technician recovers refrigerant into a recovery cylinder that is already at 80% liquid capacity. What should be done next?

Accepted Answer

Stop recovery and use a new or properly sized cylinder

Answer

Recovery cylinders must never be filled beyond 80% liquid capacity to allow for thermal expansion and prevent dangerous pressure buildup.

Question 4

What is the primary purpose of the desiccant filter-drier in a recovery machine?

Accepted Answer

To remove moisture and contaminants from recovered refrigerant

Answer

The filter-drier in a recovery machine removes moisture and particulate contaminants to protect the machine's compressor and valves.

Question 5

Which of the following refrigerants is classified as an A2L (mildly flammable) refrigerant?

Accepted Answer

R-32

Answer

R-32 is classified A2L — lower flammability limit above 3.5% by volume and a burning velocity ≤10 cm/s — unlike the A1 refrigerants R-22 and R-410A.

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

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

313D Refrigerant Handling and Recovery 2