How do I Vent heat exhanger on Worcester boiler

[supermurray]

I'm planning to add a radiator in the kitchen so I will need to drain the whole system.

I have a worcester bosch 28i junior and it says to vent the heat exchanger after filling. I have taken the cover off and can see the area the manual points to, it's a white plastic nut with a tube attached to it.

Is it just a case of slightly opening this white nut, venting it and then tightening it up again?

 

[ChrisR]

Yes. They usefully tell you not to get water on the electrics. You were about to do that, weren't you

 

[supermurray]

Thanks, no I was not going to do that as I did see the part about covering the fan. Water is going to come out at the nut and not just through the tube in that case, I thought there might be a screw to vent it direct into the tube like a radiator.