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help with replacing old central heating timer please

Discussion in 'Electrics UK' started by alanmzifa, 21 Mar 2008.

  1. alanmzifa

    alanmzifa

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    Hi, I need a bit of help replacing a central heating timer. The boiler is oil and single circuit, the pipework heating the radiators and hot water tank simultaneously.

    The existing timer is mechanical and the replacement is a Drayton Tempus 1 electronic timer for systems with 1 heating circuit.
    My problem stems from the different connections on the old and new timers.

    The old one has just 3 connections on a connection block (numbered 1,2,3), the new one six. As the old timer hasn't got one of the "new" standard 6 pin backplates I can't work out what goes where.

    The wires I can see in the wall box and where they are connected to the old timer are as follows...

    Thick black cable (presuming to boiler), 4 wires
    black - connected to 3
    red - connected to 1 (live only when timer switched to "on")
    green - earthed
    blue - not connected

    2 grey cables, 3 core (seem to be on same circuit as kitchen light wiring),
    black - connected to 3
    red - connected to 2
    green - earthed
    black - connected to to 3
    red - connected to 2
    green - earthed

    So, in other words there are 3 black wires connected to 3, 2 red wires connected to 2 and one red wire connected to1. The red wires/terminal on 2 is permanently live, the red wire/ terminal on 1 is only live when the boiler has switched on.


    Thanks in advance for your help.
     
  2. Taylortwocities

    Taylortwocities

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    As far as I can see, and from the instructions for the clock:

    The red that is on 1 on the old timer goes to terminal 3 on the new one

    All the other reds go on to L

    All the blacks go on N

    Put a link between L and 1

    That should do it.
     
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  4. alanmzifa

    alanmzifa

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    Thanks for the reply Taylortwocities.

    When you say "put a link between L and 1" I presume you mean just join these two terminals with a short piece of suitable wire, yes?
     
  5. Taylortwocities

    Taylortwocities

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