wrote:
On 1 Nov, 13:47, "John" wrote:
wrote in message

...
Hello,

How do you add Sentinel X100 concentrate via a radiator on a sealed
system?

Do you have to partially drain the radiator?

What I would do is to turn off both valves then loosen one of the
connections at the radiator side of the valve to drain out some of
the (carpet staining) water - open the bleed valve to allow the
water to run
out - then re-tighten and inject the Sentinel into the bleed valve.
However
my radiators have a large bung in the top which has the bleed valve
in it -
I have a square key to remove the bung- then re-fit using PTFE tape.

If I ever fit a system of my dreams it will have a drain point to the
outside of the house and a dosing point (whatever one is)

Sounds too complicated for me.

My system is new, it has a drain point in the passage and kitchen, you
connect a hose pipe and away you go, the drain points are very close
to doors leading to outside.

In case your wondering why the system does not have inhibitor, it
actually did until my son opened the drain point and drained the
system onto the carpet!

It really isn't that hard - do you have a towel rail in the bathroom?

If so, these are usually the easiest, especially if it is one with a bleed
valve at the top, like this one here
The rail
http://www.bathroomheaven.com/upload...e_standard.jpg
The bleed valve
http://www.ultimatehandyman.co.uk/to...leed_screw.jpg

If you turn off the radiator on both valves (Count the turns on the valve
that you don't usually turn off (the lock shield) so when you turn it back
on, you can put it back how it was.

Now the valve will resemble something like this
http://www.tradeplumbing.co.uk/asset...-Valve-chr.jpg

if you loosen it after the valve (so the part closest to the radiator) water
should start to come out, so be prepared to catch it in something, and put
an old towel down.

It will only let a little out (as air cant get in yet) so when it stops, you
need to undo the bleed screw at the top to let more out. (You don't need to
take the bleed screw all the way out, just a half turn should do)

You need to let out a little more than thee amount of X100 you wish to add.

Once you have done this, you can, if it is the same as the one in the
picture, undo the whole cap on the top, to reveal a large hole, ready for
you to pour the X100 in with a steady hand, or a funnel.

Once this is done, screw the plug back on, and re-tighten the bleed screw.
Now make sure the connection you undid at the bottom is fully tightened, and
then turn on one of the valves.

Inspect for any leaks at the bottom!

Now unscrew the small bleed screw at the top a little, and let all the air
out (until water starts to squire out) then tighten the bleed screw.

Now put the lock shield valve back to it's original position, and
congratulate yourself of a job well done :-)

Toby...