I have drained my central heating system, which is powered by a combi boiler, but am now having difficulty refilling it. All radiators are empty and bleed valves open. Are you able to offer suggestions? I have a sneaky feeling combi systems are not that easy to refill. Not a major problem really as I am having a new condensing boiler fitted within the next two to three weeks so can probably do without heating until then..but it is getting a little chilly in rural Bedfordshire!
Appreciate any advice you can give.
Thanks
Chris

"Chris Learmouth" wrote in message
...

I have drained my central heating system, which is powered by a combi
boiler, but am now having difficulty refilling it. All radiators are
empty and bleed valves open. Are you able to offer suggestions? I have
a sneaky feeling combi systems are not that easy to refill. Not a major
problem really as I am having a new condensing boiler fitted within the
next two to three weeks so can probably do without heating until
then..but it is getting a little chilly in rural Bedfordshire!
Appreciate any advice you can give.
Thanks
Chris


--
Chris Learmouth

Would you like to tell us precisely what difficulty you are
having in refilling it? It's so easy that I feel slightly baffled
as to what difficulty you are experiencing. You turn on the
valves on the filling loop ( built in or add-on ) and pressurise it to, say
1.5- 2bar whilst looking at the pressure gauge, turn off filling valves,
then bleed radiators, then repeat until all air is out ( you can open all
bleed valves on the rads and rush around closing them off as they fill up
and start leaking, but it's fraught, your walls will get doused, and you
will have to get to the filling loop to turn it off pronto after the last
radiator is full else the system pressure will skyrocket and blow off via
the overpressure valve. )

Final system pressure should be about 1.5 bar usually.

Andy.

Chris Learmouth wrote:

I have drained my central heating system, which is powered by a combi
boiler, but am now having difficulty refilling it. All radiators are
empty and bleed valves open. Are you able to offer suggestions? I have
a sneaky feeling combi systems are not that easy to refill. Not a major
problem really as I am having a new condensing boiler fitted within the
next two to three weeks so can probably do without heating until
then..but it is getting a little chilly in rural Bedfordshire!
Appreciate any advice you can give.

I assume you mean the system is a sealed system without a header tank?
(The fact that it is a combi has no real bearing).

One of the advantages of sealed systems is they are simpler to fill than
vented systems since there is no possibility of air locks.

You can find all the details you need he

http://www.makewrite.demon.co.uk/SealedCH.html

However a quick summary:

The simplest way to do this is with two people. One to control the
filling valve and watch the pressure, one to go round bleading the rads.

1) Close all the bleed valves. In one empty rad add the inhibitor.

2) Assign task to a valve operator: Watch the valve and keep adding
water to maintain the pressure round about the 1 bar level.

3) work your way round the rads, starting with the lowerst ones in the
system and bleed them.

Once done do a final check on the pressure - between 1 and 1.5 bar is
normal. Job done.

See the FAQ for the one person version of above.



--
Cheers,

John.

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