VWR VP 820 Manual Del Usuario página 9

Tab. 4
7.2 Starting
 Only operate the pump under the operating parameters and conditions described in chapter 4, Technical
data.
 Make sure the pump is used properly (see chapter 2.1).
 Make sure the pump is not used improperly (see chapter 2.2).
 Observe the safety precautions (see chapter 3).
Hazard of the pump head bursting due to excessive pressure increase
 Do not exceed max. permissible operating pressure (see chapter 4).
 Monitor pressure during operation.
 If the pressure exceeds the maximum permissible operating pressure, immediately shut
WARNING
down pump and eliminate fault (see chapter 9. Troubleshooting).
 Only throttle or regulate the air or gas quantity in the suction line to prevent the maximum
permissible operating pressure from being exceeded.
 If the air or gas quantity in the pressure line is throttled or regulated, make sure that the
maximum permissible operating pressure of the pump is not exceeded.
Reactive mixtures can cause personal injury and pump damage.
During the drying process pf pump heads these are vented.
 The vacuum system must not be used where the simultaneous operation of several
processes could lead to the formation of a reactive, explosive, or otherwise dangerous
WARNING
mixture.
Pump standstill
 With the pump at a standstill, open pressure and suction lines to normal atmospheric pressure.
Automatic starting can cause personal injury and pump damage
When the operation of the pump is interrupted by the thermal switch, the pump will restart
automatically after cooling down.
 After triggering of the thermal protection or in the event of power failure, remove the
WARNING
pump's mains plug from the socket so that the pump cannot start uncontrollably.
 Attempt work on the pump only if the pump is separated from mains power.
7.3 Switching pump on and off
Switching pump on
The pump may not start up against pressure during switch-on. This also applies in operation following a
brief power failure. If a pump starts against pressure, it may block. This activates the thermal switch,
and the pump switches off.
 Make sure that no pressure is present in the lines during switch-on.
 Switch on pump with mains switch (see fig. 2)
 If cyclic drying of the pump heads is required in the current evacuation process, switch the drying
system on at the mains switch of the control box (see fig. 2).
The drying system will only work with the pump switched on.
The drying system should only be switched on if a container has been attached to the pressure line of
the pump which will catch the condensate; otherwise the condensate will flow out uncontrolled.
When the drying system is switched on, the time period t
heads) will begin. If it is intended that t
switched on before the pump.
For the variables t
1
should run from the pump starting, the drying system should be
1
to t of the drying system, see Section 7.4.
3
(time until the first venting of the pumps
1
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