EPA System Recovery and Evacuation Procedures Flashcards

What is the minimum required evacuation level (in microns) for most commercial refrigeration systems before recharging?

Answer: 500 microns

Industry best practice and most equipment manufacturer specifications require evacuation to 500 microns or lower before charging a commercial refrigeration system.

What type of recovery equipment is required when recovering refrigerant from large appliances (systems over 5 lbs)?

Answer: A certified recovery machine with ARI-740 certification

EPA regulations require that recovery equipment for systems containing more than 5 lbs of refrigerant meet ARI Standard 740 performance requirements.

What color are DOT-approved refrigerant recovery cylinders?

Answer: Gray with a yellow top

DOT-approved refrigerant recovery cylinders are gray with a yellow top, distinguishing them from new refrigerant cylinders which are color-coded by refrigerant type.

What is the maximum fill level (by weight) allowed for recovery cylinders?

Answer: 80% of the cylinder's rated capacity

Recovery cylinders must never be filled beyond 80% of their rated capacity by weight to allow for thermal expansion of liquid refrigerant.

Which condition requires a technician to use a recovery machine rather than pushing refrigerant to the high side for recovery?

Answer: When the system has a failed compressor

When a system compressor has failed, an external recovery machine is required because the system cannot use its own compressor to transfer refrigerant.

What is the purpose of installing a filter-drier on the inlet of a recovery machine?

Answer: To protect the recovery machine from moisture and contaminants in the system

An inlet filter-drier protects the recovery machine's compressor and valves from moisture, acid, and particulates that may be present in contaminated systems.