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Is there a correct physical side of a rad to fit a TRV?

Discussion in 'Plumbing and Central Heating' started by swinster, 2 Mar 2013.

  1. swinster

    swinster

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    Hi all,

    The TRV/Lockshield set we have bought is a Realm corner set (http://www.inspiredheating.co.uk/acatalog/REALM_CORNER_THERMOSTATIC_RADIATOR_VALVES.html) however. the castings are different from one side the the other.

    If you look into one side of the casting there is a smallish hole (approx 5-6mm dia) toward the bottom of a what looks like a welded plate on the inside of the casting.

    If you look into the other side of the casting, you see a half open welded plate (see photos). The castings as the same for both the lock shield and TRV.

    Does this mean that the there is a specific physical side that the the value should go on (i.e. left or right)?

    I am in the middle of changing a rad with this new TRV. I will need to re-pipe in any case as I want the pipe work coming through he wall at different positions to where it currently does. Currently the flow is on the right, although I have been inform that this should be on the left - is this correct or does it make any difference?

    The pipework is currently tapped off of a radiator loop on the other side of the wall. If the flow needs to be on the left for this rad, then I will have to cross the pipes in the other room.

    Many thanks

    Chris
     
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  3. mickyg

    mickyg

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    trv's work better on the flow, even so called reversible ones. It doesnt matter which side flow is that gave me a little chuckle tbh :D
     
  4. swinster

    swinster

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    I'm glad it made you chuckle. I've been crying :cry:

    You can often only believe what you are told and when I saw the fitting, it did make me wonder if there was anything to it.

    Just for completeness then, why are the fittings made like this?
     
  5. D_Hailsham

    D_Hailsham

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    There should be one or two arrows on the side of the chrome body.

    If just one arrow, this indicates the direction of flow (toward rad on the hot inlet, away from rad on the cooler outlet). The TRV has to be fitted so the arrow is pointing in the correct direction, which means that the control will be vertical at one end and horizontal at the other.

    If two arrows at right angles, the TRV can be fitted, vertically or horizontally, on either end.
     
  6. Agile

    Agile

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    When choosing which side of a rad to put the reversible TRVs I see which end is naturally more accessible for the owner and which end of the TRV is better placed to monitor coolness in the room.

    That would usually be the end towards an outside wall for example.

    And not behind the sofa or computer desk!

    Tony
     
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  8. swinster

    swinster

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    Many thank. The rad in this instance in in a hallway, and the house is a terrace, so the rad is essentially slap bang in the middle of the house, with either end of the rad being accessible.

    I have stuck with the original side with the flow and TRV on the right hand side of the rad. I had to come up with some fancy (read messy!) pipe work in the other room (on the other side of the wall) in order to get the pipes going directly through the wall and straight into the TRV, however, the finish look is exactly what I was after )in the hallway anyway) When we get into the other room I will change all the pipe work around again - possibly get rid of the rads complete and get some more Thermaskirt.


    I do have one problem however on the new rad. The male 1/2" BSP adapter that connects the TRV and lock shield corner fitting to the rad (which in itself threads into the supplied bushes) leaked on first fitting. When I inserted the adapter, the appears to simply thread through the bushes and into the radiator without 'biting'. I did wrap some PTFE tape around the thread but this made no difference. Of course I have now crimped up the compression olive in the 15mm tail so captivating the nut mean that it seem impossible to see if I can tighten the adapter into the bush. I thought that these BSP threads were tapered so that they would compress as the were tightened. I'm not sure if I can righten the compression nut on the corner fitting, then try to thread the whole thing into the rad again, If anyone has any further suggestion, I would be grateful to hear what I can do.
     
  9. bolshy

    bolshy

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    You didn't use enough PTFE. Anything from 12 - 18 wraps can be required.
     
  10. swinster

    swinster

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    Ahh - my 1 or 2 seem a bit measly now!
     
  11. Agile

    Agile

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    The tapping in the radiator is a parallel thread.

    The thread on the valve adapters should ideally be a slightly tapered thread.

    Tony
     
  12. bolshy

    bolshy

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    A couple may have been enough if it was gas grade ptfe tape..... ;)

    You need to redo it....
     
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