mycom i160M - Page 64

2203M4JE-MY-iS2-N_2017.04.
Chapter 4
Compressor and Package Unit Operation
Screw Compressor i-series 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.
 Always charge all oil from the oil container. We recommend that even if some oil remains, do
not use it subsequently.
4.1.5 Lubricating Oil Management Criteria
Lubricating oils that are managed by the criteria are classified into the following categories:
(1) Mineral oils: Naphthenic base oils and paraffinic base oils
(2) Synthetic oils: Alkylbenzene (AB) and Polyalphaolefine (PAO)
(3) Synthetic oils: Polyolesters (POE)
 Oil sampling and analysis is recommended every six months.

If the following control criteria are not satisfied, replace the oil.
The analysis items and the criteria are shown in the following tables. Please note that these
management criteria may be changed without notice.
 Table 4-1 Mineral Oil and Synthetic Oil (AB, PAO)
Item
Criteria
(a) Color phase
ASTM color scale: 6.0 or less
(b) Total acid number (TAN)
0.3 mg KOH/g or less
(c) Kinematic viscosity
Within ±15 % from that of fresh oil
(d) Water content
100 mass ppm or less
(e) Degree of contamination
Degree of contamination measured by mass method (Millipore
value) shall be 15 mg/100 mL or less
 Table 4-2 Synthetic Oil (POE)
Item
Criteria
(a) Color phase
ASTM color scale: 4.0 or less
(b) Total acid number (TAN)
0.2 mg KOH/g or less
(c) Kinematic viscosity
Within ±10 % from that of fresh oil
(d) Water content
200 mass ppm or less
(e) Degree of contamination
Degree of contamination measured by mass method (Millipore
value) shall be 15 mg/100 mL or less