LG RCAW Operation & Maintenance Manual page 46

Service
The bearings used in the compressor required a small but steady quantity of oil for lubrication; the oil injection
into the compression chamber creates an oil sealing film in the compression housing for increasing the efficien-
cy and absorbing a part of heat of compression. In order to separate the oil from the mixed refrigerant gas, an
oil separator is required to ensure the least amount of oil carried into the system. Pay more attention to the oil
temperature, which has a very significant factor to the compressor bearings' life. High oil temperature will
reduce the oil viscosity and cause the poor lubrication and heat absorption in the compressor as well. The oil
viscosity is recommended to keep over 10mm
system condensing temperature to avoid the refrigerant migration into system in the summer. There is high oil
viscosity in the low ambient temperature circumstance, it could cause compressor in heavy duty to be started
up resulting less oil pressure in oil line to load the compressor. The better solution is to have higher condensing
temperature in a short time by warming up the oil.
The compressor is equipped two oil sight glasses as a standard, one is the oil high level sight glass, and the
other is the oil low level sight glass. The normal oil level in the compressor oil tank should be maintained above
the top of the low oil sight glass and in the middle level of high oil sight glass when compressor is running.
Applicable oil types are shown in the below.
COLOR, ASTM
SPECIFIC GRAVITY
VISCOSITY
FLASH POINT
POUR POINT
T.A.N
mg KOH/g
COPPER STRIP 100°C/3hr
MOISTURE
FLOC POINT
DIELETRIC STRENGTH2.5mm
46 Chiller Air-cooled Screw
2
CPI SOLEST
UNITS
68 120
- - -
- 0.945 0.94
104°F 64 131
212°F 8.9 14.53
510.8 489.2
°F
-45.4 -33.7
°F
- -
- -
-
- -
ppm
- -
°F
- -
KV
/ s at any temperature. The oil temperature just keeps above
220 370
- -
0.95 0.955
215.9 385.96
20.8 29.23
519.8 575.6
-13 -5.8
- -
- -
- <100
- -
- -
Table 15
Fig. 24
MOBIL EAL ICI EMKARATE
68 100 RL411
0.5 0.5 1.5
0.971 0.966 0.9723
62.5 95.8 48
8.3 10.5 7.3
489.2 500 523.4
-45.4 -34.6 -40
- <0.05 <0.05
- - -
<100 - -
- - -
- - -
RL375 RL421
L2.0 L1.0
0.9783 0.9759
74.1 134
10.1 15
474.8 509
-31 -34.6
<0.05 -
- -
- -
- -
- -