Assessment and Evaluation Flashcards

Recovery equipment made after November 15, 1993 is used on a high-pressure appliance (R-22) holding less than 200 lbs. What level of evacuation is required?

Answer: 0 inches Hg

For high-pressure appliances under 200 lbs, new recovery equipment must evacuate to 0 inches Hg.

Recovery equipment made after November 15, 1993 is used on a high-pressure appliance holding 200 lbs or more. What level of evacuation is required?

Answer: 10 inches Hg

High-pressure appliances with 200 lbs or more must be evacuated to 10 inches Hg with newer equipment.

What evacuation level is required for a low-pressure appliance when using recovery equipment made after November 15, 1993?

Answer: 25 mm Hg absolute

Low-pressure appliances must be evacuated to 25 mm Hg absolute with newer equipment.

A technician recovers refrigerant from a small appliance whose compressor is not working, using equipment made after November 15, 1993. What must be achieved?

Answer: Recover 80% of the charge or reach 4 inches Hg vacuum

With an inoperative compressor, a small appliance requires 80% recovery or a 4 inches Hg vacuum.

After recovery from a low-pressure chiller reaches the required vacuum, the pressure rises again. What does this indicate?

Answer: Refrigerant is still present in the system, possibly trapped in oil or water

A pressure rise after recovery means more liquid refrigerant is boiling off, so recovery must continue.

How can a technician tell that recovery from a system with a nonfunctional compressor is going slowly because refrigerant is trapped in the compressor oil?

Answer: The suction pressure rises after isolating the recovery unit

Refrigerant dissolved in the oil keeps coming out and raises pressure, so heating the compressor or tapping it again helps speed recovery.

Which standard must reclaimed refrigerant meet before it can be resold to a new owner?

Answer: AHRI 700

Reclaimed refrigerant must meet the AHRI 700 purity standard before it is sold.