VACUUBRAND MZ 2C NT VARIO without controller (o.C.) - Manual (Page 48)

page 48 of 76
Troubleshooting
Fault Possible cause Remedy
❑ Pump does not
start or stops im-
mediately.
➨ Pump has been ex-
posed to condensate?
✔ Allow pump to run for
some minutes at maxi-
mum speed with atmo-
spheric pressure at the
inlet.
➨ Overpressure in outlet
line?
✔ Remove blockage in line,
open valve.
❑ Pump does not
achieve its ulti-
mate vacuum or
usual pumping
speed.
➨ Centring ring at small
flange connection not
correctly positioned, or
leak in the pipeline or
vacuum system?
✔ Check pump directly -
connect vacuum gauge
directly at pump inlet -
then check connection,
pipeline and vacuum
system if necessary.
➨ Long, narrow vacuum
line?
✔ Use lines with larger di-
ameter, length as short as
possible.
➨ Pump has been exposed
to condensate?
✔ Allow pump to run for
some minutes with atmo-
spheric pressure at the
inlet to purge.
➨ 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 hot? ✔ Allow pump to cool down.
Determine and eliminate
the cause of overheating.
❑ 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.