Return and flow on rad valves

Discussion in 'Plumbing and Central Heating' started by Jibbs, 30 Jan 2013.

  1. Jibbs

    Jibbs

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    Hello all
    Just a quick question. Does the return/ flow have to be on a TRV valve or does it now matter?
     
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  3. mrnigelhudson

    mrnigelhudson

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    Most of the TRV's now are multi direction so it should not matter
     
  4. Jibbs

    Jibbs

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    Okay cool but say i was replacing a rad and the two valves how would i determine which was the flow and the return. Obvious answer i guess is see which one heats up first.

    Was just wondering if flow/ return had to go into TRV.
    Thanks for the info
     
  5. Whitespirit66

    Whitespirit66

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    If you're fitting a TRV, one of them will have to go to the TRV. :confused: Not all rads need a TRV, usually the rad(s) in the room where the stat is shouldn't have one.

    Most TRVs are bi-directional. Some like the Danfoss RAS range have a grey collar on them under the head that you turn to set it as flow or return.

    Yes, the only reliable way to tell the flow and return apart is to see which one heats first. Unless you can trace the pipes back.
     
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  6. Jibbs

    Jibbs

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    Thanks Whitespirit
     
  7. Charnwood

    Charnwood

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    And there was I thinking they were only bi-directional. ;)
     
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