Miele PG 8591 - DOS System Priming; DOS Venting Procedure

Settings 
66
DOS venting
The dispensing system for liquid process chemicals can only
dispense reliably if the system has been purged of air.
The DOS system must only be vented:
- if the dispensing system is being used for the first time,
- if the process chemical container has been replaced,
- the dispensing system has been sucked completely dry.
Before venting, ensure that the liquid process chemical container is
sufficiently full and the suction lance are securely screwed to the
containers. Only one DOS system can be vented at a time.
 Open the menu as follows:
Button 
Settings 
Priming DOS system
DOS... (name of dispensing system)
Priming DOS system
DOS
Automatic venting will start when the dispensing system is selected.
Once started, the automatic venting process can no longer be
cancelled.
 Select a dispensing system using the  and  arrow buttons.
 Press OK to start the venting process.
Automatic venting is successfully completed when the following
message appears in the display:
Dispensing system
successfully primed