RE: [OT] well, sort of. Central heating radiator plumbing

["Jonathan Hall" <jonathan@xxxxxxxxxxxxxxxxx>]

I asked the British Gas guy last time he was round fro some advice. I
have
four zones feeding traditional rads. Each "circuit" is 22mm with
15mm
branches off to each radiator. The pipe to the second to last radiator has
22mm in and two 15mm out. This means the circuit to the last radiator is
15mm. This is a non-TRV towel radiator in the bathroom so it allows flow if
all the other radiators shut off via their TRVs.



Cheers

Jonathan





_____

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
ian.bird@xxxxxxx
Sent: 26 June 2006 14:57
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] [OT] well, sort of. Central heating radiator plumbing




Hi all

I had thought about the last Rad scenario and the Jury is out at the
moment. Do I leave one without a valve, say the bathroom or implement some
sort of checking so if all goes well the boiler is not left on with the
water having nowhere to go. I am planning on using electronic valves and a
micro so there is logic available. There is then the possibility of a
system problem (coding or power etc.) causing unexpected problems. The plan
is very simple - turn the boiler on and off with the thermostat connected
to a computer and turn the radiators on and off accordingly.

I will have a dig around the various closets nearer the time as we are
redecorating at the moment so things are rather topsy turvy.

Thanks

Ian

---------+---------------------------->
"Tim Hawes"
<timsyahoo@google
mail.com>
Sent by:
ukha_d@yahoogroup
s.com


26/06/2006 14:12
Please respond to
ukha_d

---------+---------------------------->
>----------------------------------------------------------

To: ukha_d@yahoogroups. <mailto:ukha_d%40yahoogroups.com>
com
cc: (bcc: Ian Bird/CV/Novartis)
Subject: Re: [ukha_d] [OT] well, sort of. Central heating radiator
plumbing
>----------------------------------------------------------

Usually, yes :-)

Thing to watch is when you switch off the last radiator and the water
from the pump has nowhere to go... (as might be the case if you fitted
thermostatic valves to *every* radiator)

Often things like towel rails are left without TRVs to provide a flow
route for the water when all other radiators are "off". The other
option might be a spring loaded valve which only opens one the
pressure is sufficiently high. I can't think of the right term at the
moment but "pressure regulator" or "safety valve" etc.
might get you
close on www.bes.co.uk (I'll look again tonight if you get no joy).

HTH,

Tim.

On 6/26/06, ian.bird@cibavision <mailto:ian.bird%40cibavision.com>
.com
<ian.bird@cibavision <mailto:ian.bird%40cibavision.com>
.com> wrote:
>
> Does a typical system have a manifold with individual feeds to each
> radiator so turning one or more off won't have a dramatic affect on
> others?





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