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where to locate room thermostat

Discussion in 'Plumbing and Central Heating' started by jb123, 27 Aug 2009.

  1. jb123

    jb123

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    I have recently had my central heating system updated and found that the downstairs rooms now get warmer than the rest of the house.
    this never used to happen with my old system which did not have a room stat. the new system has thermostatic valves on all radiators except the one in the lounge .where the room stat is fitted hope someone can help thanks
     
  2. ChrisR

    ChrisR

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    Turn the losckshield valves down a bit in the rooms which get too hot. Half a turn open will probably be enough.
    That'll slow them down and give the rest a chance to catch up.

    Make sure rads are bled of air.
     
  3. namsag

    namsag

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    Now lets think what is a trv for .
    oh yeah to have the room a certain temp ,so turn the trv down till your rooms are at a tempreture you find comfortable. and if lounge is too hot turn roomstat down a bit
     
  4. kevnurse

    kevnurse

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    Namsag,
    With TRVs in a CH system it is usual to have the roomstat set fully open thus ensuring that the boiler and pump remain running and able to supply other rads with TRVs open. If the roomstat is set to a (lower) desired temperature the boiler and pump will will stop when the associated room reaches that temperature. It is unfortunate that the OP has his room stat in his lounge. Most systems have the room stat in the hall where it will never be too hot due to the stairs, multi-doors and front door.

    My recommendation to the OP is to replace the room stat and go wireless from a sender in the hall with a regular valve in the hall. Put a TRV in the lounge.
     
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  5. namsag

    namsag

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    Kevnurse dont talk sh#te why would you have a room stat set at 30 degrees the room its in would be baking.
    By lower we are talking 18 instead of the usual 21 most people set them at
     
  6. Boilerman2

    Boilerman2

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    Oh dear Kevnurse, you obviously havn't heard that the govenment don't want you to be comfortable, theyu want you to be cold but energy efficient try reading Blg Regs part L1 ;)
     
  7. kevnurse

    kevnurse

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    I've always been told by plumbers and read in publications that if a boiler and pump are running, there has to be a circuit for the water to flow through. In the absence of a pressure relief bypass, if, during the "On" period (timed or manual) all the rads close due to the thermostats, the water would stagnate. IMHO the existence of a room stat is indicative of a boiler and pump without a bypass. Therefore, the room stat must guarantee a circuit and it can only do that by demanding max temperature. Clearly, the installer should fit the stat in the coldest room in the building, so that it is the last one to get up to the desired temperature. In most homes the coldest room (or more precisely, the one that is hardest to warm up) is the hall. This is due to the larger room volume and warm air rising up the stairs and, in my experience, the hall rarely gets to the desired temp before the other rooms, unless it has a massive rad.

    As I said, this is only when the boiler and pump do not have a bypass circuit. With a bypass circuit all the rads should have TRVs. I only repeat what I have read and put into successful practice. It make sense to me.
     
  8. doitall

    doitall

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    Explain how you come to that conclusion :eek:
     
  9. kevnurse

    kevnurse

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    Because, if the boiler and pump had a bypass circuit, all the rads would be controlled by their own TRVs and it would be a perfect system. The boiler and pump could then run (via the bypass) without damage if all the rads closed independently. A room stat would not be needed. Therefore, the existence of the room stat indicates an absence of the bypass. This takes me back to my initial point: the room stat has to demand heat to ensure that flow will continue through the rad (in the same room as the stat) if all other rads are closed by their TRVs.
     
  10. doitall

    doitall

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    :LOL:

    In 50years on the tools I don't ever recall installing or going to a heating system without a room stat.

    I certainly don't think having a room stat denotes a specific type of system, and I'm positive it's not indicative of a system without a by-pass.

    Whatever next ;)
     
  11. namsag

    namsag

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    Made the mistake of thinking kevnurse knew a little of what he was talking about ,by his last 2 answers it clear he has not got a scooby
     
  12. kevnurse

    kevnurse

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    Doitall:
    I have seen a few systems without a roomstat. All the rads have TRVs except the towel rail in the bathroom which has 2 lockshield valves (1 for balance on the outlet, as standard, and the other one fully open to provide the route for the pumped flow when all the TRVs are shut.
     
  13. doitall

    doitall

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    I'm sure there's thousands with no room stat kevnurse.

    My point was not having a room stat is not indicative to not having a by-pass, or anything else for that matter.

    Since 05 the boiler has to have an interlock, which is pretty tricky without a room stat.
     
  14. JohnD

    JohnD

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    I don't see how a system that is designed to have the boiler and pump running on CH, even when every room is at or above the design temperature, can be perfect.
     
  15. jiltedjohn

    jiltedjohn

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    the interlock can take the form of an energy manager or other "compensator" it doesnt have to be a roomstat, they are just used because they are the cheapest option, as to the poster not seeing systems without roomstats, you must have lived a sheltered life :) in my 33 years on the tools I have seen hundreds, and even a fair number without room stats or TRV's !
     
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