KNF N838 E Series - Page 49

Diaphragm pump N838_E
Troubleshooting
Translation of Original Operating and Installation Instruction, KNF 347394-347605
09/23
49
Flow rate, pressure or vacuum too low
The pump does not reach the performance stated in the technical data or
data sheet.
Cause Troubleshooting
Condensation has col-
lected in the pump
head.
à
Separate the source of the condensation from the
pump.
à
Flush the pump with air at atmospheric pressure for
a few minutes (if necessary for safety reasons: with
an inert gas).
à
Install the pump at the highest location in the sys-
tem.
There is overpressure
on the pressure side
and at the same time
vacuum or pressure
above atmospheric
pressure on the suction
side.
à
Change the pneumatic conditions.
Pneumatic lines or con-
nection parts have in-
sufficient cross-sec-
tions or are constricted.
à
Disconnect the pump from the system to determine
the output values.
à
Eliminate any constriction (e.g. valve).
à
Use lines or connection parts with a larger cross-
section if necessary.
Leaks occur at pneu-
matic connections,
lines or pump head.
à
Eliminate the leaks.
Pneumatic connections
or lines are partially or
completely blocked.
à
Check the pneumatic connections and lines.
à
Remove any parts or particles that are causing
blockages.
Head parts are soiled.
à
Clean the head components.
Working diaphragm
broken
à
Stop the pump immediately.
à
Change the diaphragm (see 8 Servicing [}32]).
Diaphragm and valves
are worn or defective.
à
Replace diaphragm and valves (see Chapter 8 Ser-
vicing [}32]).
Replaced diaphragms
and valve plates.
à
Ensure that shim rings were fitted on the diaphragm
thread.
EN
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US
EN