I've got a very noisy boiler. Before I can afford to replace it, I'm
trying to put some stuff in it that might make it less noisy.
The instructions include removing the vent valve to pump the chemical
into a radiator. The picture shows the valve with a square bit in the
middle and a hexaginal bit around that which I thought I'd put a spanner
or socket on. But my vent valve doesn't have one. Do I need a tool for
that central square bit or something?
There's a picture from the instructions here -
The other option (which is looking easier now) is to drain a bit from the
whole system and put it in the tank in the loft. I've found the drain
point behind a panel outside the house. There are two pipes there -
which one do I use? Why are there two?
Thanks for any help.
Some radiators have a removeable bleed assembly - with a housing and central
bleed screw, like the one in the picture. If yours are like this, you can
unscrew the whole thing and reveal a decent sized hole (probably 1/2" BSP)
into which to pour your evil brew. Other radiators have the housing bit
integral with the rad itself - so that the only bit you can remove is the
central bleed screw - for which you need a normal bleeding (sic) key. This
only leaves a very small hole - probably too small to get anything into.
Well, I could say "use the one on the left" - or then again, it may be "the
one on the right"! I'm not sure how you expect anyone to second guess what
these two pipes are - you'll need to provide a bit more information!
I thought there might be some standard like the pedals in a car - bit
optomistic I suppose! What more information could I provide? I've got a
conventional boiler in a semi detatched house. The hot water is gravity
Are you sure that both pipes connect to the central heating? If they do -
and I can't really work out why there *would* be two - it probably doesn't
matter which you use.
However, one pipe may be for an entirely different purpose - such as
draining the domestic hot water system for example. Unless you can trace the
pipes, and find out what they connect to, there's no real way of knowing.
The only other way to find out it is tie off the ball valves on both header
tanks and open each drain in turn and observe:
* whether the level in either tank goes down
* whether what comes out looks like sludgy CH water or clear fresh water
> > Hello,
> > The other option (which is looking easier now) is to drain a bit from
> > the whole system and put it in the tank in the loft. I've found the
> > drain point behind a panel outside the house. There are two pipes
> > there - which one do I use? Why are there two?
> Well, I could say "use the one on the left" - or then again, it may be
> one on the right"! I'm not sure how you expect anyone to second guess
> these two pipes are - you'll need to provide a bit more information!
> Set Square
One pipe will presumably be the flow and the other the return. If you can
tell which is which
I suggest you use the return drain but either or both will do.
I had a similar scenario where I needed to put Fernox inhibitor in the
system. I did it twice
once using the radiator and once using the header tank. The header tank
Switch off system and shut off header tank flow( if no tap - tie up the
Undo drain(s) - the slower, within reason, that you do the draining the
better as the water
in the lower radiators could be undisturbed.
Time the empying of the header tank - say 15 mins - carry on for say 5
mins more to ensure
that there is plenty of capacity in the circuit. Close drain and introduce
header tank output pipe.(plastic hose could help on this)
Switch on water - switch on system and bleed as necessary.
Pray for quieter boiler !!
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