MAX
MIN
1
3
4
2
Max.
Min.
Fig. 15:
Refilling operating fluid
1 Filler screw with manometer
3
Sight glass
2 O-ring
4
Drain screw
Procedure
1. Unscrew the filler screw.
2. With the vacuum pump at operating temperature, refill with operating fluid up to the top marking
before the minimum fill level is reached.
3. Screw in the filler screw again.
– Be careful with the O-ring.
6.5 Switching off the vacuum pump
NOTICE
Contamination from operating fluid backflow
After the vacuum pump is switched off, there is a risk that the connected vacuum system can become
contaminated by backflow. The safety valve on the vacuum pump is not suitable for longer-term seal-
ing.
► Install an additional shut-off valve in the intake line.
► Shut off the intake line immediately after switching off the vacuum pump.
NOTICE
Contamination of the vacuum chamber from operating fluid backflow
After the vacuum pump is switched off, there is a risk that the connected vacuum system can become
contaminated by backflow.
► Vent the vacuum chamber, regardless of its size, within 30 seconds.
► Shut off the intake line with an additional shut-off valve, after the vacuum pump is switched off
during longer venting operations.
Rotary vane vacuum pumps of the HenaLine have an integrated non-return valve on the suction side.
The non-return valve closes automatically when the vacuum pump is switched off, preventing the return
flow of gas and processing materials into the intake line.
Procedure
1. If required, switch the vacuum pump off in each pressure range.
2. Switch the mains switch off or securely disconnect the drive motor from the mains.
3. Shut off the cooling water flow.
4. Install an additional shut-off valve in the intake line to ensure that the vacuum is maintained in the
vacuum chamber.
Operation
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