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Vol. 2.6 © 2020 Hanbell Precise Machinery Co., Ltd. All rights reserved
4.6 Lubricants
The main functions of lubricant in the centrifugal compressor are lubrication and cooling.
Bearings used in RT series compressors require a small but steady volume of oil for
lubrication. Please pay more attention to oil temperature which is crucial to compressor
bearing life. High oil temperature will reduce oil viscosity and result in poor lubrication and
heat dissipation in the compressor as well. It is recommended to keep oil temperature
between 30~40
℃
.
4.6.1 Lubricant table
Type
HBR-B12 HBR-B05
Unit
Specific gravity
0.944
0.955
g/ml
Viscosity
@40
℃
32
68
mm
2
/sec
(cst)
@100
℃
5.3
8.5
Flash point
215
255
℃
Pour point
-48
-39
℃
Acid number
0.01
0.01
mg KOH/g
Water content
<50
<50
ppm
Table 4.2 Specifications of lubricants
Note: 1. Use of lubricant other than the specified lubricant will result in HANBELL’s non-warranty.
2. Standard lubricant model is HBR-B12. If the operating condition of evaporation
temperature is > 14 degrees, then the concentration of refrigerant inside the lubricant will
be higher resulting in lower oil viscosity. Therefore, please use HBR-B05 oil instead.
4.6.2 Precautions in changing of oil
1. Use HANBELL approved oil and does not mix different brands of oil together. Choices
of oil should match characteristics of refrigerant. Some types of synthetic oil are
incompatible with mineral oil. Oil in the compressor should be totally cleaned up in the
system before charging different brands of oil. Charge the compressor with oil for the
first start to ensure that there is no mix at all.
2. When using polyester oil for chiller systems, please make sure that oil does not expose
to the atmosphere for prevention of change in its quality. Therefore, it is necessary to
vacuum the system completely when installing the compressor.
3. In order to secure no moisture in the system, it is suggested to clean the system by
charging it with dry Nitrogen and then vacuum it repeatedly as long as possible.
Note: When vacuuming the system, please notice that into consideration “When pressure
is low, moisture will be condensed sore charge of some dry Nitrogen is necessary.
