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Discuss Frost Stat Issue - System not working when connected in the Central Heating Systems area at ElectrciansForums.co.uk.

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  1. rolyberkin
    Online

    rolyberkin Electrician's Arms

    Location:
    Chelmsford
    Following on from my thread Heinz 57 heating system thread..................

    I have installed a Heatmiser UH8-RF control centre a RF switch and two neoair thermostats into an S plan system. Had a few issues with the UH8-RF firing the boiler but in the end wired the boiler n/c from the UH8-RF to the orange cable of the two port valve which also has the connection from the RF switch for the central heating .
    Everything works fine until I then connect the frost stat from the
    boiler which is a Buderus Camray 5, I am connecting a permanent live from the wiring centre to the frost stat and then the return from the frost stat to the orange cables from the two port valves. At this point nothing happens at all, the existing heating or UFH will not fire even though the frost stat is turned down. As soon as I disconnect the frost stat everything works again?
    Any ideas as to what I missing or doing wrong, I haven't got as far as the pipe stat as cannot get the system to work with just the frost stat!?
     
  2. buzzlightyear
    Offline

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

    Location:
    star command
    [​IMG]
     
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  3. rolyberkin
    Online

    rolyberkin Electrician's Arms

    Location:
    Chelmsford
    I think my first post is wrong, the return feed from my frost stat goes to what is in effect number seven the power feed from the time switch! cannot understand why this stops everything from working.
     
  4. Leesparkykent
    Offline

    Leesparkykent Super Moderator Staff Member Super Moderator

    Location:
    Kent
    You want the frost thermostat to open the zone valve so you want to connect it to the brown of the Valve and put the frost stat on the return wired in series.
     
  5. buzzlightyear
    Offline

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

    Location:
    star command
  6. rolyberkin
    Online

    rolyberkin Electrician's Arms

    Location:
    Chelmsford
    I have connected
    1 to permanent live
    2 to neutral
    3 to brown of valve
    I was of the view that if the frost stat activates this makes a circuit and kicks in the motorised valve & boiler, when I wire the frost stat up nothing works, nothing trips, nothing, if I then disconnect it everything works?
     
  7. buzzlightyear
    Offline

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

    Location:
    star command
  8. Leesparkykent
    Offline

    Leesparkykent Super Moderator Staff Member Super Moderator

    Location:
    Kent
    What frost stat you got?
     
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  9. rolyberkin
    Online

    rolyberkin Electrician's Arms

    Location:
    Chelmsford
    Honeywell.

    IMG_3683.JPG
     
  10. rolyberkin
    Online

    rolyberkin Electrician's Arms

    Location:
    Chelmsford
    I have, wiring it is not the issue, why it is not working is! In my mind I have altered nothing apart from adding a switch from permanent live which in effect bypasses the time clock and kicks in the pump and boiler if the boiler is about to freeze, however this stops the whole system from working?
     
  11. TJ Anderson
    Offline

    TJ Anderson Forum Mentor

    Location:
    Derby
    Not sure what has happened there then. Check your connections again.
    It shouldn't be stopping anything as it is Normally Open and is connected across Line and HTG Valve Motor (brown).
     
  12. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Hi Roly - I can't see anything wrong with what you've said, but perhaps I'd also try to simulate the frost stat at the wiring centre. From Buzz diagram, putting L onto 5 or 7 should drive the valve, put L onto Orange and start the boiler etc.
     
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  13. solarsavings
    Offline

    solarsavings Electrician's Arms

    Location:
    Cambridgeshire
    Are you providing frost protection for the whole system or just the boiler? I'm guessing it's the boiler so it should have a pipe stat wired in series with the frost stat.
    Does the system have an auto bypass valve fitted? It should have. If it has, I would wire it 1-10. That way you will only fired the boiler and drive the pump.
     
  14. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Hi - but putting L onto 10 won't open the valves, will it?
     
  15. solarsavings
    Offline

    solarsavings Electrician's Arms

    Location:
    Cambridgeshire
    If he is only protecting the boiler he doesn't need to open the valves.
     
    • Like Like x 1
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