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Moving a Room CH Thermostat

Discussion in 'Plumbing and Central Heating' started by Early riser, 16 Sep 2020.

  1. Early riser

    Early riser

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    I imagine that the thermostat shown below would have 2 or perhaps 3 wires. If that is the case, what problems might I encounter if I moved it from the living room into the hall. At the moment we have an extension where all the radiators have thermostats fitted but in the older part of the house the radiators do not. This means that when the thermostat in the living room reaches the set temperature the flow from the boiler to all of the radiators in the house stops. A friend suggested that moving the living room thermostat to the hall would alleviate this problem. FCFA37D0-05C0-4BCF-AF9F-60BA2EB98F59.jpeg
     
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  3. Mottie

    Mottie

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    A1165A2E-ADD0-4EFB-9289-1F633940DA3E.jpeg Wouldn’t it just be easier to remove the TRV from the radiator in the room that the room stat is in? Doing that, balancing the system and changing the thermostat to a digital one should make the house temperature a lot more stable.
     
    Last edited: 16 Sep 2020
  4. ianmcd

    ianmcd

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    just set the stat to max
     
  5. Early riser

    Early riser

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    The room stat is in the living room in older part of the house where there are no TRVs and the temperature there is fine. The problem lies in all the other rooms which go cold when the living room stat reaches 21.

    The living room where the thermostat is is stable, it’s the other rooms where the kids are now working at home that require the radiators to stay on.
     
  6. Mottie

    Mottie

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    Just balance the system.
     
  7. Early riser

    Early riser

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    As I said above the living room without a TRV is perfect but if I turned up the thermostat we’d roast.
     
  8. JohnD

    JohnD

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    turn down the lockshield valve at the other end of the radiator. This will reduce the amount of hot water flowing through it, so its output will reduce. Start by closing it fully, then opening by half a turn. After that, adjust it by only a quarter turn per hour. The purpose is to make you living room heat up slower than all the other rooms, so that they will be warm and their TRVs will activate, before your living room is hot enough for the room stat to turn off the heating.

    A more thorough job would be to balance all the radiators, as mottie says. It is a slow job, but not difficult.
     
  9. Early riser

    Early riser

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    In the old part of the house there are 7 radiators all without TRVs and in the extension there are also 7 radiators all with TRVs. Don't want anyone working at home feeling that their room is too cold so what's my best solution?
     
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  11. stem

    stem

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    Here are some tips for positioning a room thermostat:

    The positioning of the room thermostat is critical to the correct operation of the system. It should have overall control of the system, because it will save energy by shutting everything down when the ideal temperature is reached.

    The room thermostat should be in a room that is not effected by other sources of heat such as an open fire, cooking equipment, or direct sunlight etc. It should not be somewhere drafty or too close to a window, especially if it's one that is opened in the winter.

    Secondly it should be in a cool room, ideally the last to warm up. That way the other rooms will be warm enough, (but not overheated if fitted with TRV’s) before the room thermostat switches the entire heating system off. [To achieve this, sometimes it may involve downsizing a radiator in the room where the room stat is located]

    The radiator in the room with the thermostat installed should not have a TRV fitted. Otherwise the TRV could interfere with the operation of the room thermostat and prevent it from working properly.

    The thermostat should be mounted about 1.5 metres from the floor, and not close to, or above a radiator.

    Preferably it should not be on an outside wall, (although if you have well insulated walls, this is not quite so crucial.)

    It should be in an area where air can circulate easily, not in a corner, or hidden behind curtains, or furniture.
     
  12. Early riser

    Early riser

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  13. stem

    stem

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    There you go then. Sorted! you know what you have to do :)
     
  14. Early riser

    Early riser

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    Had a look at balancing the system on utube and if I followed the advice given there we would end up even colder. It’s the rooms upstairs both with and without TRVs that are left cold when the living room stat reaches temperature.
    Have now decided to have TRVs fitted to the 7 radiators without and at the same time take Stems advice to relocate the room thermostat to the coolest room in the house. However, given that all the radiators will have TRVs and presumably there is a thermostat in the boiler, do we still need a room thermostat?
     
  15. stem

    stem

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    Yes, you do really:

    1. A 'boiler interlock', such as a room thermostat is now a requirement of the building regulations. Standard TRV's do not constitute a boiler interlock as they won't electrically switch the boiler off like a room stat does.

    2. With only TRV control, hot water will still be circulating around a by-pass and the pump and boiler will be continue to run keeping themselves and associated components such as pipes, flues etc. hot continually, even if the TRV's have switched all of the radiators off. This wastes heat and electricity, hence the introduction of the building regs.

    3. Some systems are designed such that one radiator (normally the one in the room where the room thermostat is) acts as a by-pass and should not to have a TRV fitted to maintain a water flow through the boiler. In which case, without a room thermostat this radiator would stay hot. [Some systems have a separate by-pass device elsewhere and so don't use a radiator for this purpose]
     
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  16. Early riser

    Early riser

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    Thank you Stem for that very comprehensive reply.
     
  17. Early riser

    Early riser

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    Sorry to raise this again but I came home to find that the plumber has not only fitted the TRVs but also removed the room thermostat! The result seems to be that, as Stem has predicted, with all valves closed the boiler is still not switching off.
     
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