Prebena SK-15-10, Manual, Page: 111 / 274

PREBENA
Wilfried Bornemann GmbH & Co. KG
BEFESTIGUNGSTECHNIK
– FASTENING TECHNOLOGY
22
8.3.1 Checking the oil level
The oil level is visually (Figure 6) inspected. The maximum fill level is the lower edge
of the oil filler neck and the lower limit is located at the centre of the viewing window
(in the case of a cold compressor).
If oil colour changes occur ( whitening- contains
water, darkening - extreme overheating ), change the oil immediately (point 8.3.3).
8.3.2 Recommended types of oil
The nominal lubricating oil capacity for the compressor can be found in the "Spare
parts for maintenance" table in Appendix F . It is recommended that your do not
mix the different varieties and mineral compositions of the oil. We advise using the
following oil brands and types for the compressor. However, similar or equivalent oil
brands or types can be used.
The screw compressor is shipped from the factory with
mineral oil.
Manufacturer Type of oil
PREBENA Z.200.70 Mineralöl
PREBENA Z.200.80 Synthetiköl
WARNING: COMBINING DIFFERENT TYPES OF OIL AND OIL FROM
DIFFERENT MANUFACTURERS IS STRICTLY FORBIDDEN AND VOIDS THE
WARRANTY / GUARANTEE.
NOTE: SELECT A HIGH QUALITY OIL FOR SCREW COMPRESSORS, WITH A
VISCOSITY OF 46 MM2/S AT 40°С, FLOW POINT FROM -8 to 10°С, WITH AN
IGNITION TEMPERATURE OF MORE THAN 200 ° С.
When replacing the compressor oil, it is important to completely remove the oil from
oil reservoirs, screw conveyor unit, condenser and oil circulation lines. In addition, the
oil filter and oil separator must be replaced.
8.3.3 Oil Change
When changing the oil, it is necessary:
1 To remove the right cover of the compressor housing.
2 To switch the compressor on, so that the oil can heat to over 71

С (the radiator
is simultaneously heated over the entire surface).
3 To switch off the compressor.
4 Within 5 minutes, unscrew the plug and slowly open the drain valve to remove
the oil. Then all of the oil can be drained into a container and prepared for
disposal.
5 To manually turn the screw 3-5 revolutions in the direction of the arrow on the
front of the worm screw.
6 To remove the oil filter.
7 To install a new filter (before installing the filter, pour in a little oil so that the filter
element is impregnated and then lubricate the gasket of the filter with oil). To do
so, use the same oil as for filling the compressor.
8 To dismantle the filter / oil separator.