Question

During the process of Refrigerant Recovery, the Technician should operate the recovery unit until the system pressure has been reduced to a vacuum, then ______________.
A. Immediately close the valve in the service lines and remove the lines from the vehicle

B. Immediately close the valve in the service line and charge the system

C. *Recover to a vacuum of 4 inches of mercury, isolate the system and wait 5 minutes to see that the system holds the vaccum

D. Open the shut­off valves which must be located within 4 inches of the service ends

Answer 1

Answer:

B. Immediately close the valve in the service line and charge the system

Explanation:

The precaution should be taken prior to recovering refrigerant from a chiller are:

1) Immediately disconnect the recycling or recovery equipment and open the system for service.

2) Wait for at least a few minutes to see if the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil.

3) Immediately break the vacuum with nitrogen and open the system for service.