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.: 999019 / 22/12/2009
page 12 of 29
Use and operation
Installation 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
☞
Check that mains voltage and current conform with the equipment.
☞
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.
☞
Ambient temperature
should be at least 12 °C, because otherwise the pump pos-
sibly does not start because of the high oil viscosity at low temperature.
☞
If the 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 overheat due to insufficient cooling).
Attention: Before use pour oil into roots pump.
(See section oil change.)
☞
Prevent internal condensation, transfer of liquids or dust.
☞
The rotors of the pump may block.
☞
Pumping of liquids or dust damages the roots pump as well as the diaphragms and
valves of the diaphragm pump.
☞
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 (e. g. install a electromagnetic operated gas ballast valve).
☞
Only operate the pumping unit in a horizontal
normal position
.
Avoid turning if
pump is transported with oil filling
. Oil may enter the separator or the pump
chamber of the roots pump, if the pump is tilted more than 15°.
☞
When assembling, ensure vacuum-tightness
.
After assembly, check the complete
system for
leaks
.
☞
Check
oil level
of the roots pump every time before starting the pump, however at
least once a week. Check oil level more frequently if high gas or vapour quantities
are pumped.
During operation
☞
Pumping down can be started at any pressure, max. at atmospheric pressure.
For the pumping unit
RP 12C continuous operation
is possible only at inlet pressures
< 50 mbar.
The roots pump in the pumping units
RP 15C/22C/35C VARIO
are equipped with a
frequency control unit, which adapts the frequency of the roots pump according to the
inlet pressure via a maximum current control.
☞
Continuous operation
is possible at any pressure below atmospheric pressure.
