Diaphragm Vacuum Pumps UN012, UN024, UN036_I
Cleaning
18
6. Cleaning
When changing valve plates and wave diaphragm, inspect all parts
for dirt before assembling the pump head, and clean them if
necessary.
If a compressed air line is available, blow the parts out with it.
7. Trouble
Shooting
Before working on the pump isolate the power supply
securely, then check that the lines are not live.
The following tips for fault-finding are best employed in the
sequence shown.
Pump produces no flow
Thermal switch has opened due to over-heating of motor:
`
Disconnect pump from mains and allow it to cool.
Trace cause of over-heating and eliminate it.
Connections or lines are blocked
An external valve is closed, or a filter blocked.
Liquid (condensate) has collected in the pump head:
`
Let the pump run for a few minutes pumping air (if
necessary for safety reasons: pumping an inert
gas.)
`
Install the pump at the highest point in the system.
Diaphragms or valve plates are worn:
`
Section
5
Servicing.
Flow, pressure, or vacuum too low
Compare the actual performance with the figures in section
9 or the data sheet.
Liquid (condensate) has collected in the pump head
`
Let the pump run for a few minutes pumping air (if
necessary for safety reasons: pumping an inert
gas).
`
Install the pump at the highest point in the system.
There is pressure on the pressure side, and at the same
time vacuum, or a pressure above atmospheric, on the
suction side:
`
The pump is not designed for this condition.
The cross-section of pneumatic lines, or connected
components is too small, or they are restricted:
`
To measure the performance, disconnect the
pump from the system (small diameter tubing or a
valve can significantly affect performance).
