LEYBOLD 111065, Operating Instructions Manual

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6 Operation
Start the VARODRY by applying the supply voltage.
WARNING:
Connect the pump to an exhaust gas pipework if other gases than clean air are
pumped.The exhaust of the pump must not be blocked or constricted. Never operate
the pump with the seal-off stoppers in place blanking off the exhaust port.
The VARODRY can be started up to 20 times per hour.
6.1 Switching Off
Switch off the pump by disconnecting from the mains voltage.
If condensable vapors have been conveyed, operate the pump for 30 minutes with closed
process valve and open gas-ballast before switching off in order to evaporate the residual
condensate.
The pump will run down for several seconds. Due to the design, the vacuum system is
then vented through the pump, if no valve is closed between the pump and the vacuum
system. In this case, the pump runs backwards until the pressure is equalized. In case of
vacuum chambers exceeding a defined volume a valve must be closed before switching
off the pump to avoid over-speeding of the pump and contamination of the vacuum
system with dust streaming back from the exhaust pipework.
The maximum chamber sizes to be vented through the pump are:
VARODRY VD 65: 500 l
VARODRY VD 100: 800 l
VARODRY VD 160-200: 1000 l
The ventilation process may take several minutes, depending on the size of the container.
Wait for the pressure equalization before opening the vacuum system or disconnecting
the pump from the vacuum system.
In order to avoid back-venting of the vacuum chamber close the inlet of the pump with a
valve before switching off. A suitable inlet non return valve is available as optional
accessory.
6.2 Leybold Service
Whenever you send us equipment, indicate whether the equipment is contaminated or is
free of substances which could pose a health hazard. If it is contaminated, specify exactly
which substances are involved. You must use the form we have prepared for this
purpose.
The form Declaration of Contamination for Compressors, Vacuum Pumps and
Components is available on
www.leybold.com-> Downloads -> Download Documents .
Attach the form to each pump. This statement detailing the type of contamination is
required to satisfy legal requirements and for the protection of our employees.
We will return to the sender any equipment which is not accompanied by a contamination
statement.
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300766038_002 - © Leybold
Operation