I currently have a back boiler which for various reasons I want to swap
to a combi - the combi being located in a different position. Im trying
to identify the pipes into the back boiler, ther are 3 22mm pipes,
could somesone confirm what these are, the system works with a 2 port
valve - not the 3 port i have seen on all other schematics and CH
explanations

Your help would be greatly appreciated

In an earlier contribution to this discussion,
vinnylfc   wrote:


> I currently have a back boiler which for various reasons I want to
> swap to a combi - the combi being located in a different position. Im
> trying to identify the pipes into the back boiler, ther are 3 22mm
> pipes, could somesone confirm what these are, the system works with a
> 2 port valve - not the 3 port i have seen on all other schematics and
> CH explanations
>
> Your help would be greatly appreciated


Are all 3 pipes connected to the heat exchanger, and carrying water - or
could one be the gas supply?

Have you only got *one* 2-port valve - or are there two? Does your system
layout match any of the 'plans' in
http://content.honeywell.com/uk/homes/systems.htm ?

If so, which? Otherwise, can you take some pictures of the boiler - with a
gas fire removed - and of any equipment (pump, valves, etc.) in the airing
cupboard - and upload them somewhere and post a link here?

Are you *sure* that you want a combi? It's perfectly feasible to have a
modern condensing boiler elsewhere but *still* have stored hot water in
addition to central heating.
-- 
Cheers,
Set Square
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On 17 Sep 2005 12:07:11 -0700, "vinnylfc"  wrote:


>I currently have a back boiler which for various reasons I want to swap
>to a combi - the combi being located in a different position. Im trying
>to identify the pipes into the back boiler, ther are 3 22mm pipes,
>could somesone confirm what these are, the system works with a 2 port
>valve - not the 3 port i have seen on all other schematics and CH
>explanations
>
>Your help would be greatly appreciated


Quite likely they are heating flow, hot water flow, and a combined
return through an injector tee.

I believe the effect of the injector tee is that  the returning pumped
water through the radiators "sucks" the gravity fed indirect hot water
circuit through the cylinder. This ensures that some of the output
goes to the hot water when the radiators are on.

Most boiler manufacturers will provide old manuals for free if you
call them. It might be worth getting one.

Mr F.