2202MYJE-MY-C8-N_2018.02.
Chapter 4 Operation of Compressor and Unit
Compound 2-stage Screw Compressor 3225**C 4.1 Lubricating Oil (Refrigerant Oil)
4-4
4.1.4 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.
4.1.4.1 Precautions for Handling Polyalkylene Glycol (PAG)
PAG oil is much more hygroscopic than mineral oils and any moisture mixed in the oil may lead to rust,
corrosion and wear within the package. When handling PAG oil, pay special attention to the following
points.
Do not perform oil charging in rainy weather or at a place with high humidity to prevent
absorbing moisture.
Before charging, remove as much moisture as possible from the system by exhausting it with
a vacuum pump for a sufficient length of time and leaving the system in vacuum condition
overnight.
Do not open the lid of pail (oil container) until just before charging. Once the can is opened,
finish the oil charge as quickly as possible. (Finish the charge of a single can of oil within 15
minutes.)
Cover any gaps between the pail opening and the charge hose so that foreign substances or
moisture cannot enter. A more effective way is to substitute any space inside the pail with
nitrogen gas .
Always charge all oil from the pail. Even if some oil remains, do not use it subsequently.
If any oil drops on a painted surface, wipe it away as soon as possible. Otherwise the paint
may come off.
4.1.4.2 Precautions for Handling Polyolester (POE) Oil
This type of oil has high hygroscopicity as polyalkylene glycol, and also exhibits hydrolyzability under
high temperature environments. Moisture entry must be avoided. Therefore, special attention must be
paid as with PAG when handling POE.
Finish the charging in as short a time as possible after opening the pail to minimize exposure
to air.
Make sure that all oil in a pail is used in a single charging. Any remaining oil must be stored
indoors with the can lid closed tightly. Do not attempt to store it for a long time.
Because POE can hydrolyze, make sure to perform an oil analysis regularly in the package to
see if any abnormal conditions are present.
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