IN-VA07-B001-00
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© Future Products Group
Recovering Refrigerant
VISAIR CABINETS
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APPENDIX A
R-290 Refrigerant
Recovery
Machines
Recovery machines for use with hydrocarbon refrigerants are in limited
production.
Only an explosion proof recovery machine can be used to recover
.
Procedure
Without
Machine
1.
Evacuate an empty recovery cylinder into a vacuum.
2.
Using an accurate refrigerant scale, zero out the refrigerant scale and
weigh the empty recovery cylinder prior to adding refrigerant gauges or
hoses. Note this weight.
3.
Securely connect the evacuated cylinder to the refrigeration system using
refrigerant gauges and hoses.
4.
Open both refrigerant gauges to allow refrigerant to flow through the
gauges to the recovery cylinder. You must evacuate from both sides.
5.
Once the pressures have equalized, valve off the refrigerant gauges and
the recovery cylinder securely.
6.
Carefully remove the refrigerant hose from the recovery cylinder.
7.
Zero out the refrigerant scale and weigh the recovery cylinder. Note this
weight.
8.
Subtract the empty tank weight recorded from the cylinder now containing
the refrigerant. This will be the amount recovered.
NOTE
: You can check Serial Label to verify any leak.
9.
A recovery cylinder containing R-290 can be vented outdoors.
See “Venting R-290” for instructions on venting R-290.
10. After venting the refrigerant, purge the recovery cylinder with nitrogen at a
flow rate of 5PSIG through the liquid port of the recovery cylinder for 2
minutes outdoors, 3 metres away perimeter from any structures or ignition
sources.
11. Repeat steps 1-9 until the recovery cylinder and the system equalize into a
vacuum.
NOTE:
Trace amounts of R-290 will remain trapped in the POE oil of the
compressor.
