CH/Plumbing question no.2:
Yes, Hot at the TOP and cold at the BOTTOM. If it was the other way round I know it would be trapped air and need bleeding. I have had the rad removed and flushed so there is no sludge in it. My guess is that it has something to do with the way it is plumbed in; it's in a downstairs room, (former) outside wall and the flow enters via a TRV at the top left and the return leaves at the bottom left of the rad. Within 100mm the pipework has been spurred off to serve another rad through the outside wall into what is now a conservatory. The other rad in the conservatory works fine, as do all the others in the house. Any ideas?
Are you a tradesperson and able to answer this question?
Hi Martin,
If as you say you have removed the radiator and flushed it through the problem must be elsewhere.
The connection of the radiator is not ideal, both flow and return on the same side. I'm assuming the radiator fitted in the conservatory is a later addition.
I suspect that the system is not balanced. You will need a bit of trial and error here to find a solution.
Firstly if the radiator in the conservatory gets up to temperature fairly quickly this is stealing the heat from the other radiator. You will need to restrict the flow through this radiator to push it towards the other.
The conservatory radiator has two valves on it one you adjust for your comfort level and the other which normally has a plastic cap on it that you can't turn, this is called a "lockshield valve". You need to remove the cap it will either pop off if you lever under it with a screwdriver or it will have a screwdriver in the centre to undo. Once removed you will see the top of the valve head. Counting how many turns it takes turn it clockwise to close the valve. Now turn it back half a turn and see what effect this has on the radiators. You may need to open it a little more. Also you may have to open the other lockshield valve on the other radiator to get more flow through that.
A bit of a fiddly job but hopefully it end in success.
Good luck Roy
Answered12 May 2017
2
Anonymous user
shut the trv off try and bleed now what you are doing is filling up via the return and if you still cant get the air out close the bleed vale again and slowly crack open the rad valve union a little bit at a time until water comes out on the return, using a container to catch the water it should then push its way out, then after you have done that refit the valve tight now try and bleed through the bleed screw again if it ok you can the turn the trv back on very important the heating should not be on wile you are trying to bleed i hope this helps the problem comes from the rad is not fitted in the right manner
