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Two zone Central heating How to use HIVE and wired thermostat??

Discussion in 'Plumbing and Central Heating' started by Bambo, 23 Nov 2018.

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  1. Bambo

    Bambo

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    I have just bought hive single zone kit including hub. I have underfloor water heating in one zone, which I intend to control via hive thermostat. This would have its own two port valve.

    The second zone is upstairs with radiators, with a dedicated 2 port valve. I plan to control this via a wired thermostat

    My boiler is Vailliant ecotec, its a cobi boiler with no tank

    Can you advise how to wire the above setup please, thanks.
     
  2. stem

    stem

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    Don't underestimate the work involved in this. I don't know your level of skill, but this is only a job for someone who has a high level of electrical competency, and can understand what they are doing when connecting wires from one point to another.

    The Hive single channel Hive receiver has the connections below:

    36363556.jpg

    The Hive (N) & (L) should be connected to the N and L 'load' terminals of the same 3A fused spur as the boiler.

    The Hive (L) will also need to be linked to Hive terminal (1) 'common'

    Hive Terminal (3) 'heating on' is the live supply that goes to the underfloor heating motorised valve's live wire. The motorised valve will also need a neutral, again from the same supply as the boiler.

    The upstairs zone will be the same in principle, but as you don't give a make / model of the wired thermostat, I can't tell you what terminals to use. If it is battery powered it won't need the N & L

    Each of the motorised valves will have an internal microswitch (orange and grey wires) The orange wires from both valves are connected together, and the grey wires from each valve are also connected together. They will now provide a voltage free switch. When the existing room thermostat is removed, the two thermostat switching wires now go to the orange and grey wires.
     
  3. Bambo

    Bambo

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    You are real star

    I am going to make use of the above information and get the electrician to get things wired up as you have advised.

    Can I please please come back to you again if stuck.

    Thanks again
     
  4. stem

    stem

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    That's generally the idea of the forum. :)
     
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  5. Bambo

    Bambo

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  6. stem

    stem

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    A small link will do nicely.

    Capture.JPG
     
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  7. Bambo

    Bambo

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    Thanks a lot for the help. Let me try it soon. I will let you know how it goes.
     
  8. Bambo

    Bambo

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    Hello

    Can you please help me.

    I never got around to trying this wiring arrangement.

    I am planning to do that tomorrow.

    Can you please explain the last bit.

    At present boiler does not have any thermostat attached to it.

    I turn it on at the mains and turn on the heat pump and switch boiler to hearing mode.

    What do I do with last step??

    Thanks
     
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  10. stem

    stem

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    I don't think you really mean a Heat Pump do you?

    If there aren't any existing external controls on the system, it will need to be wired up completely from scratch, and the orange and grey wires would go to the terminals inside the boiler that are provided for use with an external room thermostat. In which case, if your boiler is one of the many that has its wiring terminals inside the room sealed chamber, then making the connection to the boiler should only be done by an RGI (Gas Safe registered) person, who can make sure it is properly sealed up again afterwards.

    As you describe it, your system will become an 'S Plan on a Combi System'. You can find wiring diagrams on the internet, if you click here, and scroll down to page 13, you can see one I found earlier.

    But like I said before. Don't underestimate the work involved in this. I don't know your level of skill, but this is only a job for someone who has a high level of electrical competency, that can understand exactly what each wire is responsible for doing and where it should go, as well as a comprehensive knowledge of the heating system and how the components relate to each other. If you don't, it's a job for someone that does.
     
    Last edited: 28 Mar 2019
  11. Bambo

    Bambo

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    Thanks. No you are right I didn't mean the heat pump.

    I was referring to the pump that is connected to the manifold.

    Could you please tell me where does LR orange wire go. It's mentioned in the top left hand box. It's says. Let orange to boiler terminal, which terminal would that be??
     
  12. Joe_N30

    Joe_N30

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    If your underfloor heating has it's own zone valve you wire hive into that valve to control it
     
  13. stem

    stem

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    Like I said..
    There are several of versions of the Vaillant ecoTEC and the terminals are not the same for all of them. Here's an example of one, but it's quite possible your boiler's connections are different. If so, you will have to consult the installation manual specific to your version of the boiler which will show you which these terminals are. But don't forget!. If you find it is necessary to open up the room sealed part of the boiler to access them it's a job for an RGI.

    Capture.JPG


    In this example, the orange and grey wires from the motorised valves would go to terminals 3 & 4. They will work either way around, but convention is that:

    3 is the 'Live supply' (goes to MV grey wire)

    4 is the 'Switched Live' (goes to MV orange wire). As you don't have a thermostat now, a 'bridge' or 'link' will be fitted to these terminals to complete the circuit. This should be removed first.

    2.JPG
     
  14. Bambo

    Bambo

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    Hi

    Can you advise where should be the live from pump (ufh) be connected?

    Thanks
     
  15. Grumpy Gasman

    Grumpy Gasman

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    Use either a relay or switch the pump via the brown core of MV.
     
  16. Joe_N30

    Joe_N30

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    I'll be honest here. Your making a proper meal of this. Just get someone in.
     
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