Notice – Labconco VACUUBRAND Diaphragm Pump 7393000 User Manual
Page 43
its. Clean the pump if necessary to avoid an increase of
the pump’s operating temperature.
Operation with silencer (optional) at the outlet: Operating
the pump at a high inlet pressure or pumping dusty gases
for a long time may cause clogging of the silencer. Check
the silencer regularly and replace if necessary.
In case of overload, the motor is shut down by a
self-hold
thermal circuit breaker in the winding.
Note: Only a manual reset is possible. Switch off the
pump and disconnect the electrical power cord. Identify
and eliminate the cause of failure. Wait approximately five
minutes before restarting the pump.
•
Note: In case of supply voltage below 100V, the lock
of the breaker may not latch and the pump might restart
on its own after sufficient cooling. Take appropriate pre-
cautions, if an automatic restart of the pump may lead
to a dangerous situation.
A warm up period (approximately 15 min.) is required to
ensure that the rated ultimate vacuum and pumping speed
are attained. Avoid overheating (e.g., due to hot process
gases).
Pumps with flow control diaphragm valve:
Use the flow control diaphragm valve (14) at the pump
inlet to control the pumping speed. Open flow control
diaphragm to pump down.
➨
Opening the flow control diaphragm: Turn counterclock-
wise. Do not attempt to open the valve further than when
resistance is first encountered.
➨
Closing: Turn clockwise. Close flow control diaphragm
valve slightly hand-tight. Further tightening will not in-
crease sealing of the valve, and may lead to damage.
Note: Over-tightening or -loosening may damage the dia-
phragm or the valve seat, and the valve may not close
properly thereafter.
Replace diaphragm in case of leaks.
NOTICE
NOTICE