Oil Levels
Check oil levels for each compressor and the
Turba-shed:
Compressor sight glass
1
⁄8 to
1
⁄2 full
Turba-shed between two lower sight glasses.
If oil level is low, add recommended oil only:
C o p e l a n d C a r l y l e
R 2 2 Suniso 3GS Suniso 3GS
R 4 0 4 A / Mobile EAL ICI Emkarate
R 5 0 7 A R C T I C 22 CC R L 6 8 H
E v a c u a t i o n
Nitrogen and moisture will remain in the
system unless proper evacuation procedures
are followed. Nitrogen left in the system may
cause head pressure problems. Moisture causes
T E V ice blockage, wax build up, acid oil, and
sludge formation.
Do not simply purge the system—this proce-
dure is expensive, harmful to the environment,
and may leave moisture and nitrogen behind.
Do not run the compressors to evacuate—this
procedure introduces moisture into the
compressor's crankcase oil and does not
produce adequate vacuum to remove mois-
ture from the rest of the system at normal
t e m p e r a t u r e s .
S e t u p
Using all copper lines and packless valves,
connect an eight CFM or larger vacuum pump
to a
7
⁄8-inch header and from the header to at
least three access ports on the rack. Connect
one micron vacuum gauge at the pump and
one at the furthest point in the system from
the rack. Plan procedures so breaking the vac-
uum with refrigerant will not introduce conta-
minates into the system. The vacuum pump
must be in good condition filled with fresh oil
to achieve desired results.
Procedure
Pull a vacuum to 1500 microns. If the vacuum
fails to hold, determine the cause and correct.
Begin again with the first of the three required
evacuations.
Break the vacuum with R22 vapor to a
pressure of about 2 psig. Do not exceed the
micron gauge transducer's maximum
pressure limit. Liquid refrigerant may cause
damage to components through thermal
shock or a pressure surge to the transducer of
the micron gauge.
Repeat first two steps.
Install the suction and liquid drier cores.
Pull a vacuum to 500 microns. Close vacuum
header valves and allow system to stand for a
minimum of 12 hours. If the 500 micron
vacuum holds, charging may begin. If the
500 micron vacuum does not hold, the cause
must be determined and corrected. Repeat the
entire evacuation procedure from the first
step.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
START-UP and MAINTENANCE Revised August 1, 1996
9 - 2
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