Shower pump in loft

[ikb]

I am installing a Salamander pump and there is absolutely no way it can be installed by the hot water cylinder - it is going to have to go in the loft - among other things the diagram for this type of installation requires that both hot & cold outlet pipes have air vents ... Does this mean that they just have a high level pipe which is open at the top (like the hot water cylinder) or is there a valve that needs to be fitted to each run? Forgive me if it is a stupid question but I can't understand how if would work without some sort of valve - once you turn the pump on surely water will come out of an open pipe even if it is a lot higher than the junction to the shower itself?

 

[stem]

Air rises and can get trapped at the top of a pipe run causing an air lock. In the loft, continue the vertical hot and cold pipe a few inches above the point where the pipes leaves to go down to the shower mixer and put one of these on the top of each. This will let you release the air similar to the valve on a radiator, close it when water comes out.

http://www.gwsupplies.co.uk/plumbing/p/5435/endfeed+manual+air+vent+15mm+brass+fitting.htm

 

[gas4you]

Most shower pumps are not really suitable for loft installation. Shower pumps want to 'push' the water and not 'pull' it. Check M I's and stick to them