45 - Service and maintenance -
9.6 OIL IN THE PUMP
When too much oil flows into the pump from the separator, the pump will not
operate properly or may be damaged.
Oil can be removed through a WITT EA 10 GÜ/GB stop valve, which can be installed in place
of the lower 1/4"-screw plug in the discharge chamber. In addition, a quick closing action valve
must be installed be-hind the drain valve.
Oil from the suction chamber or in between the intermediate pieces can only be partly removed
from the pump.
Make sure drain and quick acting valve are in-stalled in a safe manner to
prevent accidents.
At low temperatures when oil removal is slow the pump should be closed at the inlet
and warmed up on the outside with warm water to lower the viscosity of the oil
making it flow more easily. The oil return system from the surge drum should be
checked or modified to prevent further oil contamination of the pump.
When operating the pump under vacuum condition the oil drainage cannot be easily
drained. Please ask for advise.
9.7 SHIPMENT OF PUMP
When a pump has to be returned to the supplier or the factory be sure the pump is
free of refrigerant, dirt and oil. The risk of damages to goods or the environment by
leaking oil during transport is at the senders risk. When returning the pump it is
important that full information is provided stating the reason and cause of failure.
Always return the conical suction filter, in condition found when the pump was
opened, with the pump.
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