Im getting air in system but cant figure out why

fireman2203 said:
isnt return the water going into the pump then and flow the water comming out?

No, the pipe into AB on the MV is the flow from the boiler, port B is the hot water flow to the cylinder, and port B is the flow to the heating.
 
Sooo the vent isnt the reason why im getting air in the system based on what you can see on that picture then?
 

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