VACUUBRAND PC 620 - Manual (Page 15)

Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check
carefully the validity of this document with respect to his product. Manual-no.: 999029 / 01/10/2009
page 15 of 48
Installing in a vacuum system
☞ Avoid throttling losses by using connecting pipes with large diameter and keep
them as short as possible.
☞ Reduce the transmission of vibration and prevent loading due to rigid pipelines.
Insert elastic hoses or flexible elements as couplings between the pump and rigid
pipes. Attention: Flexible elements tend to shrink when evacuated.
☞ Use a suitable valve to isolate the pump from the vacuum system to allow the
pump to warm up before condensable vapours are pumped or to clean the pump
before it is switched off.
☞ Connect the exhaust to a suitable treatment plant to prevent the discharge of dan-
gerous gases and vapours to the surrounding atmosphere. Use a catchpot to pre-
vent the drainage of contaminated condensate back into the pump.
Prior to use
☞ Max. ambient temperature: 40 °C
☞ Make sure ventilation is adequate if pump is installed in a housing or if ambient
temperature is elevated. Keep a distance of min. 20 cm between fans and ambient
parts.
☞ If pump is installed in altitudes of more than 1000 m above mean sea level check
compatibility with applicable safety requirements, e. g. IEC 60034 (motor may over-
heat due to insufficient cooling).
☞ If the gas ballast valve is open, a power failure may cause unintentional ventilation
of the pump. In case this constitutes a potential source of danger, take appropriate
safety measures.
☞ When assembling, ensure vacuum-tightness. After assembly, check the complete
system for leaks.
During operation
Do not start pump if pressure difference between inlet and outlet port exceeds max.
1 bar. Attempts to start pump at higher pressure difference may cause blockade and
damage of the motor.
☞ Check compatibility with max. permitted pressure at outlet and max. pressure
difference between inlet and outlet ports.
Due to the high compression ratio of the pumps, pressure at the outlet port might be
generated being higher than the max. permitted pressure compatible with the mechanical
stability of the system.
The pump achieves its pumping speed, ultimate total vacuum and vapour pumping
rate only at operating temperature (after approx. 15 minutes).
☞ Prevent internal condensation, transfer of liquids or dust. The diaphragm and valves
will be damaged, if liquids or dust are pumped in significant amounts.
☞ Let the pump run with gas ballast to reduce condensation of pumped substances
(water vapour, solvents, ....) in the pump.
Motor is shut down by a thermal cutout in the winding.
☞ Manual reset is necessary. Switch off the pump or isolate the equipment from mains.
Wait approx. five minutes before restarting the pump. Identify cause of failure and
eliminate.
☞ Attention: In case of supply voltage below 100V, the lock of the cutout might be
restricted and the pump might restart on its own after sufficient cooling down. Take
suitable precautions, if an automatic restart of the pump may lead to a critical
dangerous situation