Oil Levels
Check oil levels for each compressor and the
Turba-shed:
Compressor sight glass
1
¼
8
to
1
¼
2
full
Turba-shed between two lower sight glasses.
If oil level is low, add recommended oil only:
Copeland
R22
Suniso 3GS
R404A/
Mobil EAL
R507
ARCTIC 22 CC
Evacuation
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 TEV ice
blockage, wax build up, acid oil, and sludge
formation.
Do not
simply purge the system—this procedure
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 compres-
sor's crankcase oil and does not produce adequate
vacuum to remove moisture from the rest of the
system at normal temperatures.
Setup
Using all copper lines and packless valves, con-
nect an eight CFM or larger vacuum pump to a
7
¼
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 vacuum with refrigerant will not
introduce contaminates 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 deter-
mined and corrected. Repeat the entire evacuation
procedure from the first step.
START-UP AND MAINTENANCE
September 1, 1997
8 - 2
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
Return to Contents