NOTICE
Risk of damage from condensation in vacuum pump
Exceeding the saturation vapor pressure of process media during the compression phase leads to
condensation in the suction chamber. This results in an increase of the achievable ultimate pressure
and to a general deterioration of the performance data of the vacuum pump as a whole. Corrosion
and contamination impair service life.
► Use the gas ballast.
► Supply dry room air or inert gas in order to increase the vapor capacity of the process medium.
► Pump condensable vapors only when the vacuum pump is warm and the gas ballast valve open.
► Operate the vacuum pump with gas ballast a further approx. 30 minutes after finishing the proc-
ess in order to dissipate any residual moisture.
Gas ballast connection for backing pump
All backing pumps have a gas ballast valve.
● For detailed instructions on operation with a gas ballast, see the operating instructions
of the respective backing pump.
Gas flow
The flow rate (gas flow) increases according to inlet pressure.
Prerequisites
● Vacuum pump is heated to operating temperature.
● If necessary, an external gas supply is closed.
Procedure
1. If necessary, connect an existing shut-off unit to the vacuum side.
2. Observe the permissible inlet pressure.
3. Turn the selector switch of the gas ballast valve to the desired position.
– Allow the selector switch to completely engage in position.
4. In case an external gas supply is used, open the supply.
6.6 Eliminate condensate load
If opening the gas ballast valve on the backing pump alone is not sufficient to reduce the condensate
load, also use the venting connection on the turbopump.
Prerequisite
● Turbopump off
Required aids
● Dry inert gas, where possible
● Venting valve with gas supply connected
Procedure
1.
Shut down the turbo pumping station.
2. Set parameter
[P:023]
to "0" (turbopump motor off).
3. Set parameter
[P:025] to "0"
(operating mode: backing pump in continuous operation).
4. Set parameter
[P:036] to "7"
(venting valve in continuous operation).
5.
Switch on the turbo pumping station.
6. Open the venting screw.
7. Allow venting to occur via the connected venting valve.
8. Operate the backing pump for approx. 5 min. to drive out the condensate.
– Repeat the operation if needed.
9.
Shut down the turbo pumping station.
10. Restore the initial configuration
(see chapter “Commissioning”, page 37)
Operation
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