When recovering the remaining R-134a refrigerant from the centrifugal chiller shown in the illustration as a vapor using the recovery unit's compressor, in addition to opening valves "1a", "1b", and the compressor suction and discharge isolation valves, which of the following would be the correct valve lineup? See Illustration GS-RA-28

Illustration GS-RA-28: the U.S. Coast Guard has not released this illustration.

Question

When recovering the remaining R-134a refrigerant from the centrifugal chiller shown in the illustration as a vapor using the recovery unit's compressor, in addition to opening valves "1a", "1b", and the compressor suction and discharge isolation valves, which of the following would be the correct valve lineup? See Illustration GS-RA-28

Illustration GS-RA-28: the U.S. Coast Guard has not released this illustration.

Accepted Answer

Option A: valves "3", "4", and "6" open; valves "2", "5", "7", "8", and "10" closed. During centrifugal chiller vapor recovery operations using the recovery unit compressor, aligning valves 3, 4, and 6 establishes the proper evacuation pathway from the chiller vessel through the recovery compressor suction while isolating extraneous liquid and water circuits.