"Roger Mills" wrote in message
...
In an earlier contribution to this discussion,
Steve wrote:

Hi.
I'm trying to change my central heating pipework from an old (I guess
Please explain what you mean by "My new flow and return pipes are
connected to the pump".

It that is literally true, the pump will simply circulate water round the
rads without it ever going through the boiler! The sequence should be: Hot
water comes out of the boiler, through the pump into the flow pipe,
through the various rads - connected in parallel - to the return pipe and
thence back to the boiler.

Of course, you are right. My description was wrong and the new layout is as
you describe: boiler - pump - supply-pipe - inlets on radiator;
outlets on radiator - return pipe - boiler

Can you draw a diagram of your system and put it on-line, and post a link
here, so that we can get a better idea of what it looks like? [Hand-drawn
and scanned will do if you can't easily produce a diagram on your
computer].
--
The diagrams in the previous post from YAPH correctly shows my before and
after layouts. However I'll see if I can put more specific diagrams
on-line. (I can draw diagrams in Word or Paintbox easily, but I'm shaky
about putting them online, so this could take a while!).

Cheers

Steve