Hello

I wonder if anyone can answer a plumbing question. I just changed the potable water expansion tank for my unvented water system. All seems to be working fine, but I am wondering if I have a missed a step.

I have a zilmet 24l tank pre-charged to 50 psi sitting at the highest point in the system.*Obviously the tank was full of air when I first connect it up and I am wondering if *I need to bleed the air from the water side of the membrane to fill it up with water? There seems to be no way to do it, and no suggestion it should be done, so I will presumably just contract legionaire's shortly?

Any comments appreciated!

Thanks
Darren