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? 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&rsquo;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? Illustration GS-RA-28

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

Accepted Answer

Option B: valves "3", "4", and "6" open; valves "2", "5", "7", "8", and "10" closed. Vapor recovery from a centrifugal chiller requires opening specific liquid and vapor isolation valves to route refrigerant gas through the recovery unit's compressor and condenser, aligning valves 3, 4, and 6 while isolating liquid paths.