Troubleshooting - VWR VP 820 Manuel D'instructions

6. Insert screw(s) (1) with disk springs (2, 3) in the center of the top
plate (5). In doing so, make sure that the disk springs are arranged
properly.
7. Screw in the screw/screws (1) in the centre of the pump top plate (5)
until it is flush with the top plate (they are flush with the top plate);
then screw one final half turn to tighten.
8. Carry out steps 1 to 7 for the second pump head.
9. Refit the pneumatic head connection: Place tube onto the connecting
part of the angle fitting, turn angle fitting to a straight position and
tighten the union nut.
Final steps
1. Reconnect system tubing.
2. Reconnect the pump to the electricity supply.
9.

Troubleshooting

Extreme danger from electrical shock!
 Disconnect the pump power supply before working on the pump.
 Make sure the pump is de-energized and secure.
DANGER
 Check the pump (see Tab. 7 to 10).
Pump produces no flow
Cause
No voltage in the power source
Thermal switch has operated following to over-
heating.
Connections or lines blocked.
External valve is closed or filter is clogged.
Condensate has collected in pump head.
Diaphragm or valve plates/sealings are worn.
Tab. 7
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Condensate has collected in pump head.
There is gauge pressure on pressure side and
at the same time vacuum or a pressure above
atmospheric pressure on suction side.
Pneumatic lines or connection parts have an
insufficient cross section.
Fault remedy
 Check room fuse and switch on if necessary.
 Disconnect pump from mains.
 Allow pump to cool.
 Trace cause of over-heating and eliminate it.
 Check connections and lines.
 Remove blockage.
 Check external valves and filters.
 Detach the condensate source from the pump.
 Flush pump (see chapter 8.2.1).
 Replace diaphragm and valve plates/sealings (see
chapter 8.3).
Fault remedy
 Detach the condensate source from the pump.
 Flush pump (see chapter 8.2.1).
 Change the pressure conditions.
 Disconnect pump from system to determine output
values.
 Eliminate throttling (e.g. valve) if necessary.
 Use lines or connection parts with larger cross section
if necessary.
English
1
2
3
4
5
6
7
8
Fig. 7: Refitting pump head
11