2205Q2JE-HO-S6-N_2020.01.
Chapter 4 Compressor and Package Unit Operation
SCV-series Screw Compressor 4.2 Lubricating Oil (Refrigerant Oil)
4-8
Polyolester Synthetic Oil (POE) for R134a (incompatible synthetic oil)
Brand
Kinematic viscosity
(40 °C) mm
2
Manufacturer Type
When using lubricating oil of a brand not described in this section, or when using
lubricating oil along with refrigerants or gases not described in this Section, please
contact us.
4.2.3 Change of Lubricating Oil Brand
The change of lubricating oil brand may cause problems in operating conditions and
the compressor. When changing the lubricating oil brand in use, make sure to
contact us because appropriate steps must be surely followed.
Package unit composition differs depending on the characteristics of lubricating oil
(compatible/incompatible with refrigerant).
As a general rule, changing compatible oil to incompatible oil or vice versa is not
allowed.
Lubricating oil contains various additives to fulfill necessary lubricating conditions. Types of
additives and their mixing ratio depend on each oil brand. We, therefore, recommend to avoid
mixed use of different brands of lubricating oil. If mixed brands of lubricating oil are used, the
different additives in the lubricating oil may react with each other and produce foreign
substances like slurry.
If it is necessary to change the brand of lubricating oil, collect as much as oil as possible from
the compressor as well as from the condenser, evaporator, and all other refrigerating unit
components before charging the new lubricating oil. After 100 to 200 hours of operation, replace
the oil again.
If lubricating oil manufacturers differ, contact both of them and inquire whether the changing is
appropriate. The same confirmation is required for changing the brand even if it is of the same
manufacturer.
There is no problem in changing the viscosity level within the same brand. However, make sure
that the viscosity grade will not cause problems during operation. (Example ： SUNISO
3GS→SUNISO 4GS)
4.2.4 Precautions for Handling lubricating Oil
When refilling lubricating oil, ensure that it is clean and does not contain foreign matters.
Be careful that air and water are not mixed in when refilling.
To ensure that the lubricating oil does not absorb air moisture, keep it indoors in an airtight
container until use.
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