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Discuss Central heating controlled by raspberry pi and relay switch in the Central Heating Systems area at ElectrciansForums.co.uk.

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  1. poumpouris
    Offline

    poumpouris EF Member

    Location:
    Nicosia
    Hey guys, im not a professional electrician, I just have a basic knowledge of some stuff.
    In order for me to be able to explain what i want to do, I will first explain what is in place at the moment.
    We have a 3 zone programmer which we never use as a programmer, we just turn on each zone manually when we want.
    So i thought, since this is all done manually i could put together a raspberry pi connected to a 4 channel relay board and control the whole thing from my smartphone. I found all the software and hardware i need and i can make the relays open and close but I am not sure what to connect where on the relay in order to get the central heating to work as it works now.
    Here is a picture of what the wires look like behind the programmer at the moment. The letters for the wires from left to right are: E,N,L,1,3,5
    wires_behind_programmer.jpg


    Here is a picture of the relay i have although the picture is of a 2 channel relay instead of 4 channel.
    relay.jpg

    From my basic understanding, what i thought i should do is connect N and L together and then connect them to the COM terminal of the relays. Then connect 1,3,5 to the NO of each relay but I'm not really sure and I don't want to burn anything.

    Can you please advise me on what to connect where?
    Thank you in advance.
     
  2. buzzlightyear
    Online

    buzzlightyear still kicking sand, before pushing up daisies . Electrician's Arms

    Location:
    star command
    have not heard of a system hive or nest ?
     
  3. Matthewd29
    Offline

    Matthewd29 Regular EF Member

    Location:
    Belfast
    What do you mean connect L and N together?
     
    • Agree Agree x 1
  4. Vortigern
    Offline

    Vortigern Electrician's Arms

    Location:
    England
    Business Name:
    F.H. Electrical
    An interesting project. Look at your controller wiring diagram that should yield what is doing what. Is your boiler old or new, would it void the warranty if you control it with a non approved system? Talk with the manufacturer of your boiler and controller, tech department and discuss it with them.
     
    • Agree Agree x 1
  5. Leesparkykent
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    Leesparkykent Super Moderator Staff Member Super Moderator

    Location:
    Kent
    Do you know the make of programmer? Is that existing programmer just doing one heating zone and hot water?
     
  6. poumpouris
    Offline

    poumpouris EF Member

    Location:
    Nicosia
    @buzzlightyear@buzzlightyear I have heard of them but i don't really need any of that, i just saw something that is done manually and found a project for my self

    @Matthewd29@Matthewd29 I meant connecting the black and the first red wire, if what im saying is idiotic just say so, thats why i asked before doing anything.

    @Vortigern@Vortigern This is the wiring diagram from the programmer manual
    wiring_diagram.png
    The boiler is about 20 years old so i dont think there is still warranty on that.

    @Leesparkykent@Leesparkykent The programmer is a Channelplus h37xl and it controls 2 heating zones and hot water at the moment
     
  7. Matthewd29
    Offline

    Matthewd29 Regular EF Member

    Location:
    Belfast
    No don't connect them together, connect the live to the common terminals and use the switch lives from the time clock on the 2 normally open terminals (presume normally open for what you need) The neutral doesn't seem to be needed on the relay shown
     
  8. Leesparkykent
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    Leesparkykent Super Moderator Staff Member Super Moderator

    Location:
    Kent
    Link live across the commons and switch lives to normally open.
     
  9. poumpouris
    Offline

    poumpouris EF Member

    Location:
    Nicosia
    Ok, but if neutral is not needed, why is it there? To power the programmer?
     
  10. Leesparkykent
    Offline

    Leesparkykent Super Moderator Staff Member Super Moderator

    Location:
    Kent
    yes the existing programmer requires a neutral, that's why it is there.
     
  11. Matthewd29
    Offline

    Matthewd29 Regular EF Member

    Location:
    Belfast
    Yep that is indeed why. But the relay shown doesn't need it.
     
  12. poumpouris
    Offline

    poumpouris EF Member

    Location:
    Nicosia
    Great, thanks for the help guys! I will give it a try in a few days and post back.
     
  13. AJshep
    Offline

    AJshep Electrician's Arms

    Location:
    South East, England
    Business Name:
    Andrew Shepherd Electrics
    First off you only have 2 relays however you have a 3 Channel Programmer !

    If you want to control all of the channels individually your need another relay.

    Another thing to note If you have a Y plan then your also need to use the nc contact on the relay you use for hot water for hot water off.

    Other than that Rpi works well I have a similar setup with mine a switching my garden lights.

    ***edit sorry just read its for CH only and you have 4 relays ***
     
  14. poumpouris
    Offline

    poumpouris EF Member

    Location:
    Nicosia
    @AJshep@AJshep I dont know if i described it in a wrong way,i intent to use the 2 zones and the hot water. I will search a bit to find out how exactly Y plan works and see if it is what i have
     
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  15. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    dunno anything about this raspberry pie. i like this though:

     
    • Funny Funny x 1
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