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Thread: Wiring a replacement room thermostat?

  1. #1
    Automated Home Lurker
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    Oct 2006
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    Default Wiring a replacement room thermostat?

    I wonder if anyone could assist me please.

    I have just purchased a Drayton Digistat 1 to replace an existing Horstmann digital room thermostat (that does not work very well) and I'm unclear on how to wire it up (despite the instructions) !

    The existing thermostat has three wires at the rear Red + Yellow + Blue, although only the Red and Yellow are connected (I presume an even earlier fitted thermostat prior to us moving in must have used the Blue wire as well).

    The terminals on the rear are marked NO (red wire connected) COM (Yellow wire connected) and NC (nothing connected).

    Can anyone advise how these connections correspond to the terminals on the Digistat please? (Digistat instructions show Term 1 = Common, Term 2 = Satisfied, and Term 3 = Demand)

    I presume COM on Horstmann is the same as Common and thus terminal 1 on the Digistat, but totally confused as to the rest.

    Many thanks
    Foxman

  2. #2
    Moderator sunbeam's Avatar
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    Default Re: Wiring a replacement room thermostat?

    I'd say your right foxman,

    common=1, if the yellow wire on your old stat is connected to this connect it to common= 1 on your new stat,

    demand =3 connect your red wire to this terminal,

    this stat as your old one doesn,t need a neutral so tuck away the blue.

  3. #3
    Automated Home Lurker
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    Default Re: Wiring a replacement room thermostat?

    Much appreciated - I will give it a whirl at the weekend.
    Foxman

  4. #4
    Automated Home Jr Member
    Join Date
    May 2006
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    Default Re: Wiring a replacement room thermostat?

    Hi Foxman,

    CAn you tell me if the new thermostate was better as I have the same one you originally had and its a bit naff.
    When the betteries start to go flat it either locks the heating on or off.
    Came back to a 29 degress house yesterday nearly melted, the setting was set to 23.
    Also when you change the batteries you have to re input all the settings.
    Regards,

    Da\/e.
    webshopwww.medwaycomputers.co.uk
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