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Does anyone know the output voltage from the boiler to the Worcester Wave

Discussion in 'Plumbing and Central Heating' started by StuartB4, 24 Feb 2018.

  1. StuartB4

    StuartB4

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    Just wondered if anyone would know this.
    I just had a Worcester Greenstar 30i installed with the Wave Smart Thermostat system.
    The thing is it's not working, boiler is working fine but the Wave is not, no display or anything. The engineer said it's all connected correctly.
    I've checked the voltage going to the Wave wall plate from the boiler and it's only 4.89 volts AC.
    I assume it should be AC as it's not a polarised voltage and is converted to DC inside the Wave with a bridge rectifier or at least rectifier diodes.

    I have a feeling the voltage is not high enough because I've seen a picture from the Wave manual that says the supply voltage is 14.3 to 16 Volts DC. Picture below.
    Thanks for any ideas you may have.
     

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  3. picasso

    picasso

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    it should be 15vdc connected to the ems bus connection in the boiler.
     
  4. bernardgreen

    bernardgreen

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    It is a DC voltage that is always greater than 9 volts. This is regulated down to provide a 5 volts supply ( or maybe 3.3 volt ) to the thermostat.

    Data is sent from the boiler by varying the voltage between 10 volts ( logic 0 ) and 14 volts ( logic 1 )

    Data is sent from the thermostat by the thermostat varying the current it takes from the supply by connecting a 200 ohm ( typical ) resistor across the supply.

    A bridge rectifier is fitted to allow the system to be polarity independent. Original design of the system was polarised but adding the bridge allowed for the system to tolerate errors in wiring that reversed the polarity without causing damage.
     
  5. picasso

    picasso

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    Wave uses wifi to send data to the boiler, the bus connection is power only.
     
  6. bernardgreen

    bernardgreen

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    Seems an awful waste of the EMS bus data facility if it has been reduced to being nothing more than a power supply.

    Might be worth checking if the data from thermostat to boiler really does go via a WiFi link.
     
  7. StuartB4

    StuartB4

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    Wow that was quick and really helpful.
    Thankyou all very much.
    I'm not going to mess with it because the engineer said he will be back next week.
    I just like to know whats going on when things dont work, especially when they are brand new.
    Thanks again.
     
  8. picasso

    picasso

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    Yes because maybe I cant read properly.....

    Capture.PNG
     
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  9. jedi

    jedi

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    What a load of sh!te.....

    Are you a professional?
     
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  11. jedi

    jedi

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    If the wave never powered up then it wasn't fitted properly and he done a runner....he probably wired it to the standard stat connection...Thick tw@t..
     
  12. jedi

    jedi

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  13. Dan Robinson

    Dan Robinson

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    Bell end.
     
  14. picasso

    picasso

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    If I make a mistake I put my hands up.
     
    Last edited: 25 Feb 2018
  15. picasso

    picasso

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    After a bit more digging I was wrong and jedi was right to pull me up on it, the wave uses the 2 wire to communicate with the boiler, I (wrongly) assumed it was the same idea as the nest :oops: should have put a bit more thought into it.
     
    Last edited: 25 Feb 2018
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  16. bernardgreen

    bernardgreen

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    . diy auto link.jpg

    Amazing. the thermostat knows that it must connect to the boiler but not until after the plastic screen protector has been removed.
     
  17. jedi

    jedi

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    Are your speciality. ...you still sucking on em?:whistle:
     
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