How do combi boiler diverter valves work?

Discussion in 'UK DIY' started by Drake, Oct 22, 2006.

  1. Drake

    Drake Guest

    Hi,
    My Chaffateaux Britony 80 combi boiler has a recurring problem (as
    mentioned in an earlier post). A Chaffateaux tekkie thinks its the
    diverter valve. It's not easy to get detailed advice from him because
    I'm not a registered engineeer.

    I can see the diverter valve in the diagram in my user booklet. It's
    part No.17 in the following illustration:

    http://tinyurl.com/yx4ku9

    I'm puzzled because there are no wires going to that component, apart
    from the CH control thermistor wires. (No.16 in the pic).

    So how do these 3-way valves work? Electrically, or by some other
    means? What sort of fault could cause it to acasionally malfunction
    for seveal days on end and then clear up for a few days?

    Thank you,

    Drake
     
    Drake, Oct 22, 2006
    #1
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  2. Drake

    Aidan Guest

    On Oct 22, 1:54 pm, Drake <> wrote:
    > Hi,
    > My Chaffateaux Britony 80 combi boiler has a recurring problem (as
    > mentioned in an earlier post). A Chaffateaux tekkie thinks its the
    > diverter valve. It's not easy to get detailed advice from him because
    > I'm not a registered engineeer.


    > So how do these 3-way valves work?


    It's a 3-way diverter valve, 1 inlet, 2 outlets. The water goes to
    either the CH or HW plate heat exchanger.

    The actuator is usually a hydraulic diaphragm connected to the HW
    supply system. Opening a tap causes a drop in pressure on one side of
    the diaphragm, which is pushed by the pressure on the other side,
    operating 3-way valve. There are electric diverter valves (e.g.,
    Honeywell) but they're far too slow for this application.

    There's usually an electric switch on the actuator, which fires the
    boiler when the valve is in the HW position.



    Electrically, or by some other
    > means? What sort of fault could cause it to acasionally malfunction
    > for seveal days on end and then clear up for a few days?
    >
    > Thank you,
    >
    > Drake
     
    Aidan, Oct 22, 2006
    #2
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  3. Drake

    Ed Sirett Guest

    On Sun, 22 Oct 2006 13:54:56 +0100, Drake wrote:

    >
    > Hi,
    > My Chaffateaux Britony 80 combi boiler has a recurring problem (as
    > mentioned in an earlier post). A Chaffateaux tekkie thinks its the
    > diverter valve. It's not easy to get detailed advice from him because
    > I'm not a registered engineeer.
    >
    > I can see the diverter valve in the diagram in my user booklet. It's
    > part No.17 in the following illustration:
    >
    > http://tinyurl.com/yx4ku9
    >
    > I'm puzzled because there are no wires going to that component, apart
    > from the CH control thermistor wires. (No.16 in the pic).
    >
    > So how do these 3-way valves work? Electrically, or by some other
    > means? What sort of fault could cause it to acasionally malfunction
    > for seveal days on end and then clear up for a few days?
    >

    In this case it electrically operated. I've checked the manual.
    There is an electrical connection but you might not be able to see it
    until you've got the valve half out.

    I strongly suspect that the only effective method of repair of this
    appliance is to replace this valve.

    I possible cause of problems is the valve become stuck and then unsticking.

    There are a lot of variations of diverter/3-way valves used in combi
    boilers.

    The most common case is for the valve to be directly moved by the same
    components that detect the water flow.

    Electrically is also used as in this case.

    Wax pellet expansion is used on the Potterton Puma.

    A 'standard' Honeywell type is used on some boilers (Pott. Lynx )

    By using the circulator pressure and a reversing servo valve (Vaillant
    VCW 24x and Sine T3)

    and probably others.


    --
    Ed Sirett - Property maintainer and registered gas fitter.
    The FAQ for uk.diy is at http://www.diyfaq.org.uk
    Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
    Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
    Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
    Gas Fitting Standards Docs here: http://www.makewrite.demon.co.uk/GasFittingStandards
     
    Ed Sirett, Oct 22, 2006
    #3
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