I have thermostatic radiator valves on both the upstairs and downstairs
heating circuits, and one radiator on each circuit which has lockshield
valves. The radiator on the downstairs circuit is at the end of the run,
which means there is always a bit of heat in the pipes to keep the
cellar aired (I have the return pipes unlagged).
I am fed up of fiddling with the bypass valve which is only a 15mm gate
valve (the boiler manual says it should be 22mm) and seems to get
blocked with crud every so often, and I bought a pressure operated valve
which I was going to put in the by-pass circuit. However I fell to
thinking, what say I put the pressure relief valve in parallel with the
motorised valve for the downstairs circuit? Then when the heat demand
was fulfilled instead of raising the airing cupboard and the corner of
the spare room to an unreasonable temperature water would circulate
around the downstairs pipes and help keep the cellar aired. Also the
longer run would cool down faster than the bypass loop (which I suspect
is shorter than the minimum 6ft specified in the manual).
On Thu, 05 Feb 2004 19:30:18 +0000, John Rouse wrote:
To summarize just so I have really understood:
You want to put the bypass valve in parallel with the heating zone valve.
The water will be forced through this valve during pump over-run time and
circulate through the far radiator via the cellar.
I think this would work provided you got the right setting for the bypass
valve and you made sure that the far radiator could not be turned off (2
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
I assume two zone, 1 up, 1 down. I assume each with a time clock and stat.
So downstairs is off by the clock and TRVs open, and upstairs is on.
Upstairs is then satisfied and the stat closes the zone valve. The boiler is
in over-run and then the auto bypass opens and sends heat to the downstairs
rads which don't want heat. Best have the airing cupboard overheated.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.