I recently injected some de-sludging solution into my home central
heating system. Now I need to drain and flush before refilling and
adding inhibitor.

Do I need to open all the bleed valves on all the rads, to allow air
in during the draining process?

Thank you,

Drake

"Drake" wrote in message
...

I recently injected some de-sludging solution into my home central
heating system. Now I need to drain and flush before refilling and
adding inhibitor.

Do I need to open all the bleed valves on all the rads, to allow air
in during the draining process?

Yes - much running about :-)

On Wed, 11 Oct 2006 11:08:07 +0100, "Roger Cain"
wrote:

Do I need to open all the bleed valves on all the rads, to allow air
in during the draining process?

Yes - much running about :-)

OK. Thanks..

Drake

On Oct 11, 11:08 am, "Roger Cain"
wrote:
"Drake" wrote in messagenews:jsapi25ihu5ap9bvs3ltmqjqcoalt0k3u8@4ax .com...



I recently injected some de-sludging solution into my home central
heating system. Now I need to drain and flush before refilling and
adding inhibitor.

Do I need to open all the bleed valves on all the rads, to allow air
in during the draining process?

Yes - much running about :-)

LOL! Better to take it slowly and make sure you don't run and open the
downstairs ones before the water level has dropped sufficiently.

MBQ

On 11 Oct 2006 04:56:05 -0700, "
wrote:

Do I need to open all the bleed valves on all the rads, to allow air
in during the draining process?

Yes - much running about :-)

LOL! Better to take it slowly and make sure you don't run and open the
downstairs ones before the water level has dropped sufficiently.

Good advice!

Gotta say, I'm really surprised at how crystal clear the water was
when I drained the system after it had been running with de-sludging
solution for a week! I was expecting the water to be at least slightly
murky...

Drake

On Oct 11, 4:49 pm, Drake wrote:
On 11 Oct 2006 04:56:05 -0700, "

wrote:
Do I need to open all the bleed valves on all the rads, to allow air
in during the draining process?

Yes - much running about :-)

LOL! Better to take it slowly and make sure you don't run and open the
downstairs ones before the water level has dropped sufficiently.

Good advice!

Gotta say, I'm really surprised at how crystal clear the water was
when I drained the system after it had been running with de-sludging
solution for a week! I was expecting the water to be at least slightly
murky...

Do you have any low points (like pipes in concrete floors) that can't
be drained easily? The crud could still be lurking.

MBQ

On 12 Oct 2006 02:06:51 -0700, "
wrote:

when I drained the system after it had been running with de-sludging
solution for a week! I was expecting the water to be at least slightly
murky...

Do you have any low points (like pipes in concrete floors) that can't
be drained easily? The crud could still be lurking.

MBQ

Yes indeed: Under the ground floor floorboards. Should I be concerned?
I think I made the mistake of not running the system for a while
before draining out the de-sludged water. The system had been turned
off for 24 hours before I drained it. So I guess the suspended sludge
might have settled. I probably should have run the system immediately
before draining, yes?

BTW, I take back what I said about the water being "crystal" clear.
What came out of the hose pipe looked clear, but later, I bled about a
pint from one rad (to get rid of an air lock) after refilling the
system with fresh water, and it did have a very slight murkiness.

Still, if there's sludge left in the system, it's probably better off
lying harmlessly at the bottom of some low-lying pipes than caking up
the combi boiler's expensive component's, would you say?

Cheers,

Drake