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Discuss Zoned central heating problem in the Plumbing Zone area at PlumbersForums.net
Hi Happyflyer ,
Thanks for all your time and help. Sorry I didn't reply but got called away.
My system looks very much like your first drawing minus the bypass valve part. I cant see that anywhere. However on reading the boiler manual it says there is an automatic bypass inside the boiler, but then goes on to say if the system employs thermostatic radiator valves on all radiators, or two port valves, then a bypass circuit must be fitted with an automatic bypass valve to ensure a flow of water should all valves be in the closed position. Which means you where spot on!
Is there anywhere this could be installed that i would be able to miss it i.e under floor boards or would it be as it appears in your drawing?
One final question does the size of the pipe increase/decrease the pressure? the reason i ask is that it has been installed using a 10mm plastic pipe which seems very narrow compared to the copper pipes coming from and to the boiler.
Many thanks for your help
Fred
Hi,
I was told that it was a dual zone system and it was installed only 3 months ago, but there is a problem. When I switch a zone off i.e. upstairs ,the rads still get warm in that zone, once the other zone (downstairs) comes on and vice versa.
Fred.
Your boiler has something called pump overrun which protects the boiler. An automatic bypass provides a route for the water to flow when the zone valves are closed.
You've definitely a combi yes? And a hot water cylinder?
Your house doesn't sound huge! Two bedroom?
Hi Fred I've never put them on the return if they are on the return what's to stop the heat on the flow going where it wants Evan with one return it only creeps up getting the nearest rad warm you must have linked them somewhere is a new build might have put a downstairs rad in upstairs loop or other way round easy mistake to do
Hi Guys,
Just had my heating sorted after a short 4 months wait! just glad we've had a nice summer. Anyway just thought I would update you on what the issues were.
1st no by-pass circuit installed.
2nd zone valves on return instead of flow.
3rd 2 flow pipes fitted (1 to each zone) but only 1 return for both zones.
Pleased to say that the chap today knew what he was doing and has put it all right. Thanks for all your advice, looks like everyone on he was correct in one way or another.
cheers fellas
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