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dennis@home

On 25/05/2014 11:47, wrote:
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

The cylinder should be filled with air on the otherside of the membrane.
It will partly fill with water once there is some pressure in the system.
It should never fill compltetly with water, its bust if it does.