red-handled taps in airing cupboard, how open should they be

[cthomas01]

Within my airing cupboard there are 3 red-handled taps on the pipes, 2 which look like they are on pipes leading into the loft, and one on a pipe at the bottom of the boiler.

What are each of these for?

How open should each one be?

I think my system is a low pressure one, there is a hot water cylinder in the airing cupboard and a plastic tank in the loft.

Thanks.

 

[taydo]

ok the two into the loft sound like hot and cold feed supplies why dont you turn them off and see what happens.

the other one i am reluctant to suggest anything is your boiler in your cylinder cuboard by the way?

if its on the ch system it could be a bypass which means it has been set up and does not need playing with. I cant see it

as a general rule I open a valve fully then turn back one revolution this goes for you mains water stop valve also.