Operation; Preparing For Start-Up - VWR VP 820 Manuel D'instructions

English
 If the pump is used as a vacuum pump, safely discharge the pump exhaust at the pump's pneumatic
outlet.
A marking on the pump head shows the direction of flow.
1. Remove the protective plugs from the pneumatic connectors of the pump.
2. Connect the suction line and pressure line.
3. Lay the suction and pressure line at a downward angle to prevent condensate from running into the
pump.
4. Insert the power cable's plug into a properly installed shockproof socket.
7.

Operation

7.1

Preparing for Start-up

Before switching on the pump, observe the following points:
Operational requirements
Pump  All hoses attached properly
 Fan openings not blocked
 Specifications of the power supply correspond with the data on the pump's type plate.
 The pump outlet is not closed or constricted.
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.
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. 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.
8