VACUUBRAND PC 620 NT plastic housing - Manual (Page 91)

page 91 of 113
Fault Possible cause Remedy
❑ Pump does not
achieve its ultimate
vacuum or usual
pumping speed.
➨ Pump too hot? ✔ Allow pump to cool down.
Determine and eliminate
the cause of overheating.
➨ Deposits have been
formed inside the
pump?
✔ Clean and inspect the
pump heads.
➨ Diaphragms or valves
damaged?
✔ Replace diaphragms and/
or valves.
➨ Outgassing substances
or vapor generated in
the process?
✔ Check process parame-
ters.
❑ Pump too noisy. ➨ Atmospheric or high
pressure at the pump
inlet?
✔ Connect hose or silencer
to pump outlet. Be careful
not to cause outlet over-
pressure, especially with
condensable vapors.
➨ Diaphragm crack or
diaphragm clamping
disc loose?
✔ Perform maintenance.
➨ Other than above men-
tioned causes?
✔ Contact local distributor.
❑ Pump seized. ✔ Contact local distributor.
➨
A service manual with exploded view drawings, spare parts list and
directions for repair is available on request.
+
The service manual is intended for trained service people only.
* only if ”Sound” ”On” is selected
** VMS: Vacuum management system to switch non-VARIO pumps