RSES Refrigerant Management 4

Question 1

What is the minimum required vacuum level (in microns) that most equipment manufacturers specify before charging a system with refrigerant?

Accepted Answer

500 microns

Answer

Most manufacturers require evacuation to 500 microns or lower to ensure adequate moisture removal and verify system integrity before charging.

Question 2

A certified technician may purchase refrigerants in containers larger than 2 lbs without restriction under Section 608. What document proves this certification?

Accepted Answer

EPA Section 608 technician certification card

Answer

EPA Section 608 requires technicians to hold a valid certification card issued by an EPA-approved certifying organization to purchase refrigerants in containers over 2 lbs.

Question 3

During refrigerant recovery, the vapor recovery method is generally slower than liquid recovery. In which situation is vapor-only recovery typically used?

Accepted Answer

Small systems or when liquid access is not available

Answer

Vapor recovery is typically used on small systems or when the service valve configuration doesn't allow direct liquid removal from the system.

Question 4

Refrigerant R-744 is the designation for which natural refrigerant that is being increasingly used in transcritical refrigeration systems?

Accepted Answer

Carbon dioxide (CO₂)

Answer

R-744 is carbon dioxide (CO₂), which has a GWP of 1 and is used in transcritical refrigeration systems particularly in food retail and industrial applications.

Question 5

What action must a technician take if they discover a refrigerant leak rate exceeding the EPA threshold in an appliance with more than 50 lbs of refrigerant?

Accepted Answer

Repair the leak within 30 days or develop a retrofit/retirement plan within 30 days

Answer

EPA Section 608 requires that leaks exceeding threshold rates in large appliances be repaired within 30 days of discovery, or a retrofit/retirement plan must be developed within 30 days.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Refrigerant Management 4