I have just had a new central heating system installed. Boiler is system condensor. The rads, with exception of one, have individual thermostats. The rad with no thermostat apparently needs to be kept on at all times. The problem is that even though I turn the ROOM thermostat down to zero this radiator stays hot? Is there a problem or is this how it should work?
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New Central Heating Problem
- Thread starter Snowflame
- Start date
You have some problems Snowflake 
This will be your bypass radiator which ensures flow can circulate to and from boiler to get rid of excess heat should all your TRVs shut down.
It will cool down when your boiler switches itself off
This will be your bypass radiator which ensures flow can circulate to and from boiler to get rid of excess heat should all your TRVs shut down.
It will cool down when your boiler switches itself off
I must start reading these posts more thoroughly
might also warm up after you run the hot water as the boiler will dump the exess heat 
B
breezer
if its of any help our bathroom rad has no trv, and it does get warm when other rad are off, so we put towels on it
Me too but I appreciate warm dry towels even in the summer. I know I should fit an anti gravity valve in my case but nobody will pay me to do it!!!
No snowflame, the wall stat will keep the CH off in the summer. You should hardly if ever notice the heating effect on the rad.
Assuming you have a 3 port motorised valve, the overrun to dump heat from the boiler when HW call is finished, will still go into the hw cylinder.
Effectively your rad only "bypasses" the other rads, when their trv's are all shut. It will not be plumbed as a boiler bypass, like many a bathroom radiator.
Haven't got 2 x 2 ports have you?
Assuming you have a 3 port motorised valve, the overrun to dump heat from the boiler when HW call is finished, will still go into the hw cylinder.
Effectively your rad only "bypasses" the other rads, when their trv's are all shut. It will not be plumbed as a boiler bypass, like many a bathroom radiator.
Haven't got 2 x 2 ports have you?
ChrisR - Yesterday I turned OFF the CH ( at the Room Stat programmer ) and turned the room stat down to zero. Hall rad remained on and was so hot I couldn't touch it. Have they screwed up on the install? Sorry I can't answer any of your technical questions as I don't understand the system well enough.
two of these
or one of these
or one of these
was the water on without the ch 
wish i'd learned to post pics ages ago we all know what we are looking at now
generic term is "y plan "
wish i'd learned to post pics ages ago we all know what we are looking at now
generic term is "y plan "
Snowflame said:
Sounds like they screwed up to me, and could take some sorting.
I would check where the returns join the common return as it sounds like your getting a reverse flow, this can happen if a connection has been taken off before the mv, and the return is in the common.
A simple test is to run the heating and mark which end gets hot first, turn the heating off, does the other end now get hot first in the hot water only position
Explain that in English Chriss
W
wilhelm
yes kevin, a bit more so-fisticated than them there smileys
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