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Replacing 4 wire thermostat with 2 wire thermostat

Discussion in 'Plumbing and Central Heating' started by Wright39, 3 Feb 2013.

  1. Wright39

    Wright39

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    Hi guys,

    Im replacing my old honeywell thermostat with a siemens more modern looking one. The old one is wired to a 4 wire system but the new one apparently only uses 2 wires..... Please can you help. I have attached photos
    The terminals are 2341 from top to bottom of image
    Here are the wires: blue 2, yellow 3 and red 1
    Here is the wiring diagram
    And here is the new thermostat.

    Dan
     
  2. Whitespirit66

    Whitespirit66

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    Red to L
    Yellow to Y1

    Make safe bare ends of blue and earth and tuck out of the way, as not needed.
     
  3. Dan Robinson

    Dan Robinson

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    Or Red to Y1, Yellow to L :p
     
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  4. Whitespirit66

    Whitespirit66

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    So, which way is best?

     
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  6. Dan Robinson

    Dan Robinson

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  7. Wright39

    Wright39

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    I'm a lover not a fighter. And would love an answer?
     
  8. Dan Robinson

    Dan Robinson

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    You've had two answers, and either would do, although W's is more conventional.
     
  9. Wright39

    Wright39

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    Ok thanks guys.
     
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