Operating manual- SAB 355 (including ATEX)
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004059 en 2019.11
Maintenance instructions
8.4 Oil
The oil separator in the screw compressor unit has an integrated oil reservoir. The oil is used for
lubrication, cooling, sealing and regulation of the capacity slide.
• Only use oil types recommended in the SABROE oil recommendation.
• Oil is added via the oil pump/oil charging valve.
• Check the oil level in the oil separator. It must not be higher than the upper sight glass. Oil
must be added when the level reaches the lower sight glass. The correct level appears on-
ly when the unit is operating.
• If the oil level is too low, check for leaks and possible insufficient oil return from the refrig-
eration plant.
• The oil level will rise approx. 10 mm if the indicated amount of oil is charged, see
Table 15: Oil charging.
8.5 Oil change
Oil change
The oil in the unit must be changed after a specific number of operating hours or when an oil anal-
ysis shows that a change is required.
We advise you to let Johnson Controls Denmark’s service organisation change the oil as it is rec-
ommended to replace all filters in the unit at the same time.
Type of
unit
Oil
separator
Total Volume
Amount of oil
per 10 mm
Sight glass
level
Volume
(litres)
Volume
(gallon)
Volume
(litres)
Volume
(gallon)
SAB 355
OHU
6041/5030
Upper 667 176 15 4
Middle
588 155 16
4
Lower 507 134
17 4
SAB 355
OHU
7650/6050
Upper
(2 pieces)
1493 394 23 6
1165 308 31 8
Lower
(2 pieces)
788 208 32 8
438 116 27 7
Table 15: Oil charging
8.6 Charging compressor with lubricating oil
Caution!
Only charge oil when the unit pressure is below 6 bar!
Oil charging is carried out by means of a portable oil charging pump, see Fig. 25. Proceed as
follows:
1. Connect the high-pressure hose, pos. 7, to the service valve, pos. 106, on the unit via the
non-return valve, pos. 12. Use the correct reduction nipple. See Fig. 26.
2. Place the free end of the suction hose from the pump, pos. 1, together with the by-pass
hose, pos. 2, in the barrel.
3. Open the ball valve, pos. 9, and service valve, pos. 106, and start the pump, pos. 5.
4. Circulate the oil until the system is free from air bubbles. Close the ball valve, pos. 9. The
oil will now be charged to the unit.
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