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Replacement for Manual Thermostat

Discussion in 'Plumbing and Central Heating' started by greyam100, 23 Sep 2015.

  1. greyam100

    greyam100

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    Hi,
    The underfloor heating (hot water system, 1st generation) in our sunroom is currently operated solely by a manual wall mounted thermostat which works fine but can anyone suggest

    a) a simple replacement thermostat with a timer on it (digital)
    b) whether it is fairly easily replaced by myself who can do basic diy electrics, changing lights etc.

    The underfloor heating is heated by the central heating boiler, but only when the thermostat calls for it. The main house central heating is on a wall mounted timer but the underfloor heating is independent from it.

    Photos of current underfloor heating thermostat are here....

    http://www.diynot.com/diy/media/albums/thermostat.25399/

    Thanks in advance
     
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  3. PrenticeBoyofDerry

    PrenticeBoyofDerry

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  4. greyam100

    greyam100

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    Thanks for the lead
     
  5. greyam100

    greyam100

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    Hi Guys & Gals,

    Grateful if someone could review my wiring proposals between old (SUNVIC TLX) and new (DANFOSS Tp5000M Si) thermostats. New one is MAINS powered, not battery powered.

    Photo's of old and new terminals are here http://www.diynot.com/diy/media/albums/thermostat.25399/

    I propose to wire the new stat as follows:

    wire to SUNVIC TERMINAL 3 (L) goes to DANFOSS terminal 'L'
    wire to SUNVIC TERMINAL 4 (N) goes to DANFOSS terminal 'N'
    wire to SUNVIC TERMINAL 1 (switched live??) goes to DANFOSS terminal 3 (N/O)
    Link DANFOSS terminal 'L' to DANFOSS terminal 2 (COM)

    The metal back plate on the sunvic is earthed (2 x green/yellow wire). Both green/yellow wires to be connected to DANFOSS Earth termnal.

    Thanks in advance.
     
  6. simond

    simond

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    Sounds OK as long as the old TLX (L) terminal is always on and doesn't go through a timer.

    It would be unusual to put an UFH zone solely on a simple TLX stat, however long ago it was installed, because in the winter it would be on 24/7.
     
  7. greyam100

    greyam100

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    thanks for the reply simond. Yeah the old TLX is always on.

    we moved in last winter and found that the UFH would come on through the night, even if we had turned the thermostat down to 8-10 degrees before hitting the sack. Hence we had to keep remembering to turn it right down to lowest setting otherwise, yes, it would be on all day while no-one at home. Hence the reason for putting the timer on it.

    cheers
     
  8. DIYnot Local

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