I've just fitted this in my uncle's house, the rad is a double and has the flow and return pipe on the right hand side (top n bottom), both pipes get hot, the right hand side of the rad gets warm but the left struggles to get tepid, the rad has no air in, both the lockshields are new...........what'dya think?
2 metre long rad won't heat up
- Thread starter DIYedboy
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D
dextrous
Water will take the easiest route. Having both valves on one side gives it no "reason" to flow through across the radiator.
Solution - extend the pipework to have a valve at each end of the rad.
Solution - extend the pipework to have a valve at each end of the rad.
D
dextrous
Indeed it should, but it sounds like it's just made the majority of the rad a deadleg. The op used the word "just", which implies quite recently.
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D
dextrous
Try tightening down the lockshield a bit to "hold" the water in there a bit longer.
N
namsag
Too big a rad to work like that, alter pipes
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Change pipes to TBOE.
Second time in a week we agree, this is getting scary.
As others have said, connecting flow and return to opposite ends is recommended.
Connecting both to the same end might work, providing the flow is connected at the top, and the return at the bottom.
If you have connected the flow at the bottom, the hot water will just whiz straight up the first column and out the return without heating the rest of the rad. That sounds like the problem you have.
Connect the flow at the top, and the lower density of the hot water may be enough to keep it at the top of the rad, spreading further along, but 2 metres is probably too far for that to work effectively.
Connecting both to the same end might work, providing the flow is connected at the top, and the return at the bottom.
If you have connected the flow at the bottom, the hot water will just whiz straight up the first column and out the return without heating the rest of the rad. That sounds like the problem you have.
Connect the flow at the top, and the lower density of the hot water may be enough to keep it at the top of the rad, spreading further along, but 2 metres is probably too far for that to work effectively.
Why shouldn't it work? TBSE is, after all, the connection method used when the radiators are tested under BS EN 442. The flow has to be at the top.
There should be a noticeable temperature between flow and return (compare with other rads). If there isn't, the lockshield valve is not closed enough. If you have not adjusted the LS valve, try it one turn open from fully closed. Closing the valve increases the temp difference and vice versa.The OP said:
Adding this new rad may have upset the balance of the whole system.
N
namsag
D.Halisham ..... This is where your googling of information lets you down in preference to experience of working on systems and actuallyknowing what works and what doesnt.
flow to the top should work, depends on water velocity, I would never have done this anyway, it will allways be a pain.
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