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Discuss New Radiator getting hot from hot water heating in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hi all,
I had a new boiler fitted and while the plumber was here they fitted two new isolation valves in my airing cupboard so I could easily connect a new radiator in the extension I am building.
Well I have fitted the radiator and all seemed fine until I realised that the radiator also gets warm when the hot water is heating up, I have a combi boiler with a unvented hot water tank in the airing cupboard.
I have attached a photo and put arrows to the new valves.
Hope someone can see a issue and if there is a easy fix or if it will cause issues if left. Thanks
IMG_20180310_215552.jpg
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no pic?
 
Is it just the pic or is the return pipe to the new rad teed into the return pipe from the cylinder?? If so then there’s your problem. Piped wrong
 
Is it just the pic or is the return pipe to the new rad teed into the return pipe from the cylinder??
The lower pipe is teed in to the tank return! Says primary coil on the tank lable The radiator does get hot as normal when heating is running but I must double check this.
 
Rule of thumb is that return from cylinder is the last tee before return goes back to the boiler. The rad is probably heating in reverse when the water is on the way back to the boiler. Was this done by a plumber??
 
Yeh Morpheus , it's piped wrong , I mean the radiator return pipe is teed into the return pipe but in the wrong place , where the automatic bypass valve is is just a loop under the floor to the main return pipe running up the wall in the pic with 2 white elbows behind the flow isolator , so if the rad had been teed in there then no risk of back flow ,,,
 
Sorry to keep going on I just want to make sure I know what pipe is wrong so when I get him back I know what I'm talking about
So is it the green arrowed pipe that is wrong or was I right in the previous picture just replacing it in the wrong place?
IMG_20180311_003722.jpg
 
no green is right its the other lever valve
 
As above the other valve needs to be teed into the return before the point that the cylinder return joins it
 
So have I got it right in the previous post picture? Sorry for keep asking just annoyed that it's been done wrong and have to get it redone :(
 
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nope sorry to say still wrong needs to go into the main return back to your boiler
 
Thanks for reply Shaun, so right valve to be moved just need to find out which pipe is the main return to boiler, wish they put nice labels on pipes for people like me
 
Thanks for reply Shaun, so right valve to be moved just need to find out which pipe is the main return to boiler, wish they put nice labels on pipes for people like me

your heating/plumber engy should know if he doesnt well theres something wrong :D
 
lol, he should know but he got it wrong first time so I can't say I have full confidence in his workmanship :)

easy way get another one if you dont trust him
 
You could put a non return valve somewhere on the return pipe going to the rad, with the arrow facing towards the isolation valve. That should stop the reverse flow and allow it to work as normal.
 
I was wondering the same, I think this may be a easier option than trying to find the correct part of the pipe to tee off from.
 
Bit of a bodge though and check valve will likely stick if your central heating water isn’t the cleanest
 
There should be 2 motorised valves on the primary flow to the cylinder. One is wired up via a enrgy cutout to prevent the hot water reaching over 85°c
 
There should be 2 motorised valves on the primary flow to the cylinder. One is wired up via a enrgy cutout to prevent the hot water reaching over 85°c

Only if a 3 port is used no need when it's a 2 port
 
G3 states that there should be at least one 2 port connected via the energy cutout including 3 port valves be it flow share or hot water priority
 
G3 states that there should be at least one 2 port connected via the energy cutout including 3 port valves be it flow share or hot water priority

Yes that's only for 3 port valves no need when it's an s plan system
 
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