SABROE SAB 283, Operation Manual

Page: 71 / 78

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 through the oil pump and oil charging valve.
• Check the oil level in the oil separator. It must not be higher than the upper sight glass. You
must add oil when the level reaches the lower sight glass. The correct level appears only when
the unit is operating.
• If the oil level is too low, check for leaks and possible insufficient oil return from the
refrigeration plant.
• The oil level will rise approximately 10 mm if the indicated amount of oil is charged, see Table
27 .
Oil change
The oil in the unit must be changed after a specific number of operating hours or when an oil
analysis shows that a change is required.
We advise you to let Johnson Controls Denmark’s service organisation change the oil as it is
recommended to replace all filters in the unit at the same time.
Table 27: Oil charging
Total Volume Amount of oil per 10 mm
Oil separator
Sight
glass level
Volume
(litres)
Volume
(gallon)
Volume
(litres)
Volume
(gallon)
Upper 667 176 15 4
Middle 588 155 16 4
OHU
6042/5030
Lower 507 134 17 4
1493 394 23 6
Upper
(2 pieces)
1165 308 31 8
788 208 32 8
OHU
7650/6050
Lower
(2 pieces)
438 116 27 7
Charging the compressor with lubricating oil
Before you begin:
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 Figure 28 . Proceed as
follows:
1. Connect the high-pressure hose, position 7, to the service valve, position 106, on the unit
through the non-return valve, position 12. Use the correct reduction nipple. See Figure 29 .
71 SAB 283-355 A-Frame OHU 6042 and OHU 7650 (including ATEX) Screw Compressor Unit