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Myson Thermostat Mrt1 and Nest E Thermostat replacement

Discussion in 'Plumbing and Central Heating' started by ccarr32051, 14 Dec 2020.

  1. ccarr32051

    ccarr32051

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    Hi
    Looking for advice on how to replace and label the wires
    on the Myson MRT1 Thermostat to wire on a Nest 3rd generation thermostat. Looks like 3 wires as I think the brown at T3/4 snakes around back of grey wire to T1.

    Thanks in advance

    myrton thermostat.jpg
     
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  3. muggles

    muggles

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    It's not quite that simple - you need to find the wiring centre in your airing cupboard, or the programmer if you have a combi boiler, and wire the Heat Link into there
     
  4. ianmcd

    ianmcd

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    Do you have any other controls like a timer or programmer somewhere ?
     
  5. ccarr32051

    ccarr32051

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    Hi
    Sorry but it looks like I listed the wrong Nest product and its the Nest E thermostat. It looks like the heatlink is connected to the thermostat wire and the thermostat plugs in to the wall via a usb charger. I have a programmer old fashioned dial timer attached to the boiler.
    Sorry for posting wrong info as its a freebie I am getting from a friend - still to get it
     
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  7. ericmark

    ericmark

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    Left hand terminal 4 is neutral and not used with Nest e and needs to go into a bit of terminal block. Only 1 and 3 are used, as this shows [​IMG] only two wires are used with on/off control.
     
  8. muggles

    muggles

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  9. stem

    stem

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    The old dial timer will need to be set so as to be permanently 'on' 24/7, otherwise it will interfere with the operation of the Nest-e.

    Nest-e incorporates both time and temperature control in a single unit.
     
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  10. ccarr32051

    ccarr32051

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    Thanks guys for the info its much clearer now
     
  11. DIYnot Local

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