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Section 3 • Installation
4. After some refrigerant has entered the system, the
compressor unit starting procedure may be fol-
lowed, see Starting procedure in Section 4.
5. Continue charging refrigerant into the system un-
til the proper operating requirements are satisfied.
Then, close the liquid charging connection and
open the liquid line valve allowing the system to
operate normally. To check that enough refrigerant
has been added, the liquid sight glass should show
no bubbles, and there will be a liquid seal in the re-
ceiver. If these two conditions are not satisfied, ad-
ditional refrigerant must be added.
6. When sufficient refrigerant has been charged into
the system, close the charging and drum valves.
Then remove the drum from the system.
7. During the charging period, observe the gauge
carefully to insure no operating difficulties. Watch
head pressures closely to make sure the condensers
are functioning properly.
8. Since it is usually necessary to use several drums
when charging a system, follow the procedures in
steps 1 and 2 when attaching a new drum. After
charging, the refrigerant drums should be kept
nearby for several days as it is sometimes necessary
to add more refrigerant as the system settles down.
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
3 – 23
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Troubleshooting
