WARNING
If you apply too deep of a vacuum, any trapped moisture might freeze and might not be exhausted as
vapor.
Failure to remove all of the moisture can create acids in the refrigerant circuit. This may damage
internal system components over time causing premature failures of items such as oil pump motors
and any other devices sensitive to acid contact.
Figure 74: Service valves
Callout Description
A Service valves
The service valves in the previous figure are to be used for all vapor connection processes. This
includes evacuation, vacuum gauge connection, and vapor charging.
Table 102: System pressures
Gauge Absolute
Inches of mercury (Hg) below
one standard atmosphere (in.)
psia
Millimeters of mercury
(Hg)
Microns
Boiling temperatures of
water (°F)
0 14.696 760.0 760,000 212
10.24 9.629 500.0 500,000 192
22.05 3.865 200.0 200,000 151
25.98 1.935 100.0 100,000 124
27.95 0.968 50.0 50,000 101
28.94 0.481 25.0 25,000 78
29.53 0.192 10.0 10,000 52
29.67 0.122 6.3 6,300 40
29.72 0.099 5.0 5,000 35
29.842 0.039 2.0 2,000 15
YMC
2
Mod B with OptiView Control Center
150
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