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Heating controls wiring

  • 06-04-2010 11:55am
    #1
    Daragh86
    Registered Users, Registered Users 2 Posts: 173 ✭✭


    I've recently had a Heatline Vizo combi boiler installed and have put in a 7 day-2 zone programmer, two wireless stats and two zone valves.

    My problem is that the way they are wired means the heating has to be on to use the domestic hot water. The mains comes through a 3amp spur into the programmer, programmer to both wireless stat recievers, from recievers to motorised valves and then from the motorised valves to the boiler. This means that unless the valves are open theres no power to the boiler at all which in turn means that when I turn on a hot water tap the flow sensor in the boiler for DHW hasn't got power to know that there is a need to heat water.

    So....my question is- is there any other way to wire this boiler so that I can use my heating from the programmer, stats and valves and also have the hot water facility all the time???

    The boiler has an analogue clock and for turning it on and off it has three options - OFF, DHW & DHW AND HEATING. At the moment with the wiring the way it is I have the boiler switch set constantly to DHW AND HEATING.

    Thanks for any help in advance.


Comments

  • #2
    meercat
    Registered Users, Registered Users 2 Posts: 4,828 ✭✭✭meercat


    could possibly be that the valves are not set up right.get your electrician back to check the set up.you should be able to have hot water independently


  • #3
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    The boiler is wired wrong and it needs to be wired properly, you need a permanent power feed to the boiler for hot water, frost protection and pump/fan over run to dissipate heat and prevent overheating.

    On the boiler there are two points to wire your external controls to, you can choose between 240v and low voltage depending on the voltage you are using, making and breaking the link on the boiler with a external switch will turn off the heating and will not interfere with the correct running of the boiler. Make sure 240v is not put on the low voltage connection as although it will work it can dramatically reduce the life time of the PCB.
    it is just a matter of reading the manufactures instructions and removing the correct link, it's all in the instructions with pictures, so wire the call for heat(orange and gray on zone valves) in to the correct link and when the valves are off only the heating will be off, Gary.


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