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Wiring Hive to oil powered central heating boiler

Discussion in 'Plumbing and Central Heating' started by Dave678, 25 Dec 2018.

  1. Dave678

    Dave678

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    Hi,

    I have an oil fed Geminox FCX 30c boiler (https://www.manualslib.com/products/Geminox-Fcx-30-C-4112227.html) which has REG 103 (FBR1) ambient thermostat connected to it (as well as an external probe thermometer)

    The boiler has a mains power cable that plugs into socket in boiler room and the wire from the thermometer runs though the wall into the living room. The thermostat is an ambience thermostat that allows you to change the temperature to +/- 5 degree to the "comfort temperature" which is set on the boiler (set to 20 deg). So the by moving the dial on the thermostat the temp can be set to -15 though to 25 deg.

    The wire connecting the thermostat to the boiler is telephone line cable. Only 3 wires are used - white, blue, brown from the thermostat to the boiler. The manual for both boiler and thermostat doesn't provide any great detail on the connections.

    I'm trying to work out if/how an Hive Active Receiver can be wired into the system.

    I've done a simple diagram of how the wires are currently running and have the REG103 / FBR1 manual page.

    current wiring.jpg
    [​IMG]

    [​IMG]
    REG 103.JPG
    [​IMG]


    I can see how the permanent live and permanent neutral would would go but am bit stuck trying to work out how the others should be connected - ie the connect Common (1), Heating off (2), Heating on (3).
    hive receiver.jpg
    I'm assuming i can ignore the external sensor and leave that alone.

    Any help, thoughts or advice greatly appreciated.

    Thanks,
    Dave
     
    Last edited: 26 Dec 2018
  2. ianmcd

    ianmcd

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    you only need 1 and 3 they are your switched lives, forget 2 , gas or oil they are exactly the same , a million posts on here about them, LNE and the switching wires nothing else
     
  3. Dave678

    Dave678

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    Thanks for the reply Ian.

    I've re-uploaded the images as they didnt seem to be displaying but are ok now.

    From your reply and other posts I can see how i only need to wire in L, N and 1 and 3 on the Hive receiver. I understand how to L, N can be wired from power terminal block in boiler but its the 1 and 3 i am unsure of.

    Just to clarify, currently when the boiler is on it is always on - as you can see from diagram it has a direct mains connection via normal plug as a power source. The ambient thermostat then provides the call for heat on/off i assume. What threw me slightly was the telephone wire cable (but this is valid as its mentioned in the manual) from the thermostat to the boiler - plus i cant find any indication of what the 3 wires are - aside from the colour of them.

    I'd sort of assumed i would just need to fully disconnect current thermostat as that will be replaced by the Hive wireless on. But what I'm unsure of is how to wire in the 1 and 3 terminals on the Hive receiver.

    Thanks for any inputs!

    Dave
     
  4. simb82

    simb82

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    You have compensated controls already...why downgrade with hive?
     
  5. Dave678

    Dave678

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    @simb82 Well, I guess i don't see it as a downgrade. The boiler is in a garage so you have to go outside to change the core setting on it or do anything to it. The current thermostat only allows +/- 5 changes and not setting to an actual required temperature. Multiple thermostats can also be added easily onto Hive wirelessly. The current thermostat is an ugly cheap looking plastic thing. Finally, probably most importantly I work away all week so want to be able to adjust the temperature remotely for a number of reasons. Why would you think of it as a downgrade? Am i missing something? Curious!

    That said I'm not sure this boiler is a good suitability for Hive with its ambient thermostat connection. And i dont want to use the Hive to turn the boiler fully off/on - just send a "call for heat" which I am not sure can be done - hence the question. Further reading of the manual says the boiler supports a BM REG 108 thermostat which is 4 wire connection- the Geminox boiler manual says to consult the thermostat manual - which doesn't seem to be available anywhere with any wiring details.
     
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