8
Refrigerant Recovery Tips
Purging Non-Condensables from Recovery Cylinders
In the event that the Recovery Cylinder pressure is higher than expected, or if the recovery process
seems slower than usual, use an external gauge (not the gauge on the recovery machine) and a
Refrigerant Pressure/Temperature chart to check for the presence of non-condensable gases in the
cylinder.
You can bleed/purge non-condensables into another cylinder following this procedure:
1.
The Recovery Cylinder must remain undisturbed for at least 24 hours for the non-condensables to
rise to the top of the cylinder.
2.
Through a Manifold Gauge Set, connect the Recovery Cylinder Vapor Port to the Vapor Port of a
second recovery cylinder.
3.
Consult a Refrigerant Pressure/Temperature chart, and check the temperature of the Recovery
Cylinder to determine what the pressure should be.
4.
While the pressure is higher than the pressure on the chart, slowly open the Vapor Port to bleed off
excess pressure until it is about 5 psi (0.35 Kg/cm
2
) above the pressure listed on the chart.
5.
Close the valves and let the cylinder stand still for 10 minutes. Repeat if necessary.
80% Fill Weight
Refrigerant
Liquid Density
@ 130ºF (
Lb/Ft
3
)
Fill
Multiplier
Water
61.522
-
R-22
66.312
1.08
R-134a
67.46
1.10
R-404A
53.18
0.86
R-407C
62.28
1.01
R-410A
56.11
0.91
R-417A
62.383
1.01
R-417C
65.243
1.06
R-422A
58.343
0.95
R-422B
61.85
1.01
R-422C
59.174
0.96
R-422D
60.642
0.99
R-437A
65.231
1.06
R-438A
61.804
1.00
R-454B
51.343
0.83
Refrigerant recovery cylinders should only be filled to 80% of their
maximum
volume to allow for
expansion during transportation. Recovery cylinder weight capacity is calculated by the manufacturer
using water and given as
Water Capacity
. Since refrigerant has a different density than water you
must make a quick calculation to determine the
maximum weight
of refrigerant you can recover.
Stamped markings on the recovery tank indicate Tare Weight
(
TW
) and Water Capacity (
WC
). The following equation should
be used to calculate the maximum weight allowed in a cylinder.
WC x Fill Multiplier x 0.8 + TW
= Max Total Tank Weight
✪
See Page 4 for additional information
Example (R-22):
WC is 47.6Lbs, TW is 24Lbs.
47.6 x 1.08 x 0.8 + 24 =
65.1 Lbs Total Tank Weight
(41.1Lbs of R-22)
Accounting for Hose Weight
The weight of recovery hoses should be taken into consideration during recovery and charging. Be
sure to ‘tare’ the scale only after placing the cylinder on the platform
and
connecting hoses (to both
tank and system). Also make note of the weight if hoses are removed at any point during the process.
WS260 OPERATION MANUAL
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