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GRAHAM BORLEY
Joined: 09 Feb 2007
Posts: 3
Location: glemsford suffolk
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 Posted: Fri Mar 28, 2008 9:17 am Post subject: rads cold at bottom |
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the last two rads in my system are cold at the the bottom and warm at the top, i have tried bleeding them but does not work any ideas please. graham.  |
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thescruff
Moderator
Joined: 03 May 2003
Posts: 4303
Location: Bath
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| Posted: Fri Mar 28, 2008 2:54 pm Post subject: |
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| Either you need to open the lockshield valve a tad more and balance the others, or the pipes are undersized or partially blocked restricting the flow. |
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GRAHAM BORLEY
Joined: 09 Feb 2007
Posts: 3
Location: glemsford suffolk
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| Posted: Fri Mar 28, 2008 4:21 pm Post subject: |
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| thescruff wrote: | | Either you need to open the lockshield valve a tad more and balance the others, or the pipes are undersized or partially blocked restricting the flow. |
it is an open system this problem seems to happen over a period of time . |
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thescruff
Moderator
Joined: 03 May 2003
Posts: 4303
Location: Bath
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| Posted: Fri Mar 28, 2008 4:52 pm Post subject: |
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The top will always be hotter than the bottom.
If you had cold spots in the bottom center, then that would be sludge, the same with the pipes, if microbore then they could be blocking up and reducing the flow/return.
Are the TRV's shutting down if its over a period of time, try opening them to a higher setting, the only other cause will be balancing the radiator by opening and closing the lockshield valves |
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