Central heating direction of flow

Discussion in 'Plumbers' Talk' started by Morley, Nov 29, 2006.

  1. Morley

    Morley Guest

    I am about to add a radiator to the central heating system in my new dining room. The plumber has left me 2 tails poking through the ceiling with a couple of isolator valves to allow me to put in my own pipe work and radiator.

    My problem is, if I want a TRV on the radiator I think I need to know the direction of flow for the TRV to work correctly. Bearing in mind that I currently have 2 terminated tails, how can I prove the direction of flow prior to adding the pipework, radiator and TRV?

    I get the feeling I am going to have to pull up floor boards and stuff:-(
  2. hallbeck

    hallbeck New Member

    Simple! - just put a bi directional TRV in - most of them are now anyway.

    You can tell if they are bi directional because they will have 2 arrows pointing in opposite direction on the metal body of the valve.

    Leave you floor boards alone!!
  3. tgs

    tgs New Member

    Put the central heating on and feel the pipes. The flow is the one that gets warm first.

    It is possible to get TRVs that just don't care about direction. Honeywells's are one but there are others. Ask at a plumber's merchants about these.
  4. Morley

    Morley Guest

    I was aware that most TRV's could go either on the inlet or outlet of the radiator but only as long as the direction of flow was correct. Now I know that some are able to cope with flow in either direction, I'll track some down.

    Thanks for your help.
  5. M.I.G.

    M.I.G. New Member

    it would've been very easy for your plumber to have left the pipes marked the F&R.
  6. Morley

    Morley Guest

    Its not easy to get my plumber to do anything. Turning up would be a bonus. This is the reason that after 8 months I am having to fit the radiator myself.

    I work in computers and to be honest, I wouldn't want to go and fix his computer anymore than he wants to service my boiler or fit a new radiator.
  7. Jimbo

    Jimbo New Member

    The bi-directional valves can have a tendancy to 'sing' when installed on the return though so better to put on flow if you can identify.
  8. facilities

    facilities New Member

    hi' i am not a professsional plumber, but could you not link up the two tails with perhaps plastic plumbing open the isolator valves and as tgs as said the one that warms first is the flow.
  9. Stench

    Stench New Member

    ****'s sake! Just use a bi-directional TRV as per advice. Job could 've been done by now.

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