Type II Flashcards

What is the recovery/evacuation requirement for a small high-pressure appliance containing less than 200 lbs with a non-operating compressor (post-1993 equipment)?

Answer: 4 inches Hg vacuum

Appliances under 200 lbs with a non-operating compressor must be evacuated to 4 inches of mercury vacuum.

Non-condensable gases such as air in a high-pressure system will cause what effect?

Answer: Higher than normal head pressure

Air and other non-condensables raise head pressure and reduce system efficiency.

When is the best time to check for non-condensables in a recovery cylinder?

Answer: After the cylinder has stabilized at a known temperature

Allowing the cylinder to reach a stable temperature lets you compare measured pressure to the refrigerant's saturation pressure.

An appliance with a leak rate above the applicable threshold must be repaired rather than topped off if it contains how much refrigerant?

Answer: 50 pounds or more

Appliances containing 50 or more pounds of refrigerant are subject to leak repair requirements.

What does superheat measurement help a technician verify in a high-pressure system?

Answer: Proper refrigerant charge and evaporator performance

Superheat readings indicate whether the evaporator is properly fed and the charge is correct.

A filter-drier is installed in a high-pressure system primarily to do what?

Answer: Remove moisture and contaminants

Filter-driers capture moisture and particulate contaminants to protect the system.

When recovering refrigerant into a cylinder, the cylinder should never be filled beyond what percentage of its capacity by weight?

Answer: 80%

Recovery cylinders must not be filled beyond 80% to allow for liquid expansion.