System Evacuation
| Before adding refrigerant charge, evacuate to proper vacuum level to remove non-condensable gases and to evaporate and remove moisture in the system. This chart shows the vacuum level and the temperature at which water will vaporize. |
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|
Pressure Vacuum Equivalents
|
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|
Absolute pressure
above a zero base |
Vacuum below
one atmosphere |
Fraction
of one atmosphere |
Vaporization
temperature of H2O in °F |
||
|
Microns
|
PSIA
|
mm Hg
|
Inches Hg
|
||
|
0
|
0.000
|
760.00
|
29.921
|
-
|
-
|
|
50
|
0.001
|
759.95
|
29.920
|
1/15000
|
-50
|
|
100
|
0.002
|
759.90
|
29.920
|
1/7600
|
-40
|
|
150
|
0.003
|
759.85
|
29.920
|
1/5100
|
-33
|
|
200
|
0.004
|
759.80
|
29.910
|
1/3800
|
-28
|
|
300
|
0.006
|
759.70
|
29.910
|
1/2500
|
-21
|
|
500
|
0.009
|
759.50
|
29.900
|
1/1500
|
-12
|
|
1,000
|
0.019
|
759.00
|
29.880
|
1/760
|
1
|
|
2,000
|
0.039
|
758.00
|
29.840
|
1/380
|
15
|
|
4,000
|
0.078
|
756.00
|
29.760
|
1/190
|
29
|
|
6,000
|
0.117
|
754.00
|
29.690
|
1/127
|
39
|
|
10,000
|
0.193
|
750.00
|
29.530
|
1/76
|
52
|
|
15,000
|
0.290
|
745.00
|
29.330
|
1/50
|
63
|
|
20,000
|
0.387
|
740.00
|
29.130
|
1/38
|
72
|
|
30,000
|
0.580
|
730.00
|
28.740
|
1/25
|
84
|
|
50,000
|
0.967
|
710.00
|
27.950
|
1/15
|
101
|
|
100,000
|
1.930
|
660.00
|
25.980
|
2/15
|
125
|
|
200,000
|
3.870
|
560.00
|
22.050
|
1/4
|
152
|
|
500,000
|
9.670
|
260.00
|
10.240
|
2/3
|
192
|
|
760,000
|
14.696
|
0.00
|
0.00
|
1 atmos
|
212
|