NOTICE
Damage to the vacuum pump due to intense temperature fluctuations
If the housing cools down too quickly due to external influences, there is a risk of contact between the
rotor at operating temperature and the colder pump housing. This will result in irreversible pump dam-
age.
► Ensure that the screw pump is operated continuously within the applicable pressure range.
► Slowly adapt the throughput and temperature of the cooling liquid.
► Perform a max. of 6 starts every hour.
Procedure
1. Adjust the voltage supply using a suitable starting circuit (e.g. protective circuit).
2. Switch on the screw pump in each pressure range between atmospheric pressure and final pres-
sure as required.
3. Open the cooling water feed and ensure an adequate flow.
4. With the sealing gas device installed, open the sealing gas supply and check the flow rate.
5. With the gas ballast supply installed, open the gas feed and check the flow rate.
6. Open the shut-off unit in the intake line and activate the screw pump in the process.
7. Allow the screw pump to warm up for approx. 30 minutes with the vacuum flange closed prior to
starting the process.
8. Measure the motor current and make a note of the value as reference for future maintenance
work and troubleshooting.
6.3 Conveying condensable vapors
Screw pumps which are equipped with either a gas ballast system or a gas ballast valve are suitable for
conveying condensable vapors in the gas flow.
Prerequisite
● Silencer with condensate drain fitted
● Condensate drain in exhaust line
Required aids
● Collection receptacle
1
Fig. 27:
Gas ballast valve
1 Gas ballast valve
Procedure
1. Design for a condensate drain in the exhaust line.
2. Place a collection receptacle below the condensate drain.
3. Open the gas ballast valve.
4. Allow the screw pump to run for 30 minutes in order to heat up.
5. Open the shut-off valve on the vacuum line.
Operation
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