Mark wrote:
On Fri, 30 May 2008 08:47:50 +0100, Lobster
wrote:

Mark wrote:
On Thu, 29 May 2008 21:09:17 +0100, Andy Hall
wrote:

On 2008-05-29 08:11:37 +0100, Lobster said:

Andy Hall wrote:
On 2008-05-28 20:35:28 +0100, Mark said:

Thanks for all the replies. I have looked at hiring a power flusher
but the only one I can find is about £100 and it doesn't mention use
in a sealed system.
Yes it will work with a sealed system. £100 is a reasonable price.
How do you actually attach power flushers to the CH system? Do you need
to provide a special port or something?

David
Usually they hook into the pump position - at least on ones that I've seen.
How can I find this out for sure before actually hiring one? The
instructions of the HSS one were vague at best about this matter. I
doubt the hire shop will really know how to use it.
Did you see the downloadable PDF instructions as well as the top-line
version on the site?

Yes, they were the instructions I was referring to! There it says it
can be connected across the pump with it removed or across the
radiator so I guess the latter would be better for me.

Reading the instructions today they don't seem quite as confusing ;-)
I wish they described the procedure for a sealed system though.

Can anyone explain how to get inhibitor (X100) in to a sealed system?



Just use a cartridge gun. IIRC x100 comes with a plastic spout for
radiators. What I did was to loosen the bleed valve on the highest rad
in the house and catch the water in a bowl. About a litre came out of
mine. Then remove the valve altogether. Put the stuff in gradually over
a couple of hours and give it a helping hand with a piece of wire or
something. It did all go in eventually but, as it's just a load of
crystals in detergent, it tends to block the hole.

Might take a couple of days for the system to settle down afterwards.
Boric acid isn't very soluble, especially in cold water, so it needs a
lot of circulating before it's all dissolved and can start doing its
job. During that time you're likely to get random readings on the
pressure gauge. Yes, it's a lot of money to pay for a cheap chemical but
we all like to put our faith in a named product