Refrigeration and Air Conditioning Regulations Flashcards

A technician recovers R-22 from a high-pressure appliance with 250 lb of refrigerant, built after November 15, 1993, using recovery equipment made after that date. What level of evacuation is required?

Answer: 10 inches Hg vacuum

HCFC-22 appliances with 200 lb or more of refrigerant must be evacuated to 10 inches Hg vacuum.

What is the required evacuation level for an HCFC-22 appliance containing less than 200 lb of refrigerant when using recovery equipment made after November 15, 1993?

Answer: 0 inches Hg

HCFC-22 appliances with less than 200 lb of refrigerant must be evacuated to 0 inches Hg.

Low-pressure appliances serviced with recovery equipment made after November 15, 1993 must be evacuated to what level?

Answer: 25 mm Hg absolute

Low-pressure appliances must be evacuated to 25 mm Hg absolute, which is about 29 inches Hg vacuum.

A high-pressure appliance has a leak that makes it impossible to reach the required vacuum. What is the minimum required evacuation level?

Answer: Atmospheric pressure (0 psig)

If leaks make the required vacuum impossible to reach, the technician must still evacuate to atmospheric pressure.

A small appliance has an inoperative compressor. Using recovery equipment made after November 15, 1993, what percentage of the refrigerant must be recovered?

Answer: 80%

Small appliances with a non-working compressor require 80% recovery, or evacuation to 4 inches Hg vacuum.

What is the maximum refrigerant charge for an appliance on which system-dependent (passive) recovery equipment may be used?

Answer: 15 lb

System-dependent recovery equipment may only be used on appliances containing 15 lb of refrigerant or less.

Which of these is an alternative to the 90% recovery requirement for a small appliance with a working compressor?

Answer: Evacuating to 4 inches Hg vacuum

Small-appliance recovery is met by either the required percentage or evacuation to 4 inches Hg vacuum.