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Thermostats - wiring new digital in place of honeywell t40 advice

Discussion in 'Plumbing and Central Heating' started by Matchermike, 22 Oct 2021.

  1. Matchermike

    Matchermike

    Joined:
    1 Aug 2013
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    Location:
    Gloucestershire
    Country:
    United Kingdom
    Hi All,



    I have a center manual thermostat, with the wiring schedule as shown below. I want to swap for a heatmiser slimline v3,



    How do i swap the wiring over please? What confuses me is the mention of two neutrals. I have 3 wires - live, neutral and what i assume is switched live. Which is switched live in this?





    [​IMG]

    And i am assuming i will wire it in like this:



    A2 being switched live (pin 3 on the old)?
    L being 1 on the old
    N being 2 on the old
    And wire in a loop?



    [​IMG]



    Thanks in advance

    Mike
     
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  3. ericmark

    ericmark

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    Location:
    Llanfair Caereinion, Nr Welshpool
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    Top picture I see brown and grey so assume brown, black and grey that seems good. Bottom picture I see brown, blue and green/yellow with green/yellow connected to live, that is clearly not right, yes I know it says
    which some seem to think means if not single core it can be over-sleeved. However except for the cord from the ceiling rose to bulb holder an earth must be run even if the unit is class II since 1966, so even if you did feel over sleeving is permitted then still non complaint.
     
  4. Matchermike

    Matchermike

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    Location:
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    Thank you for the reply.

    I should of stated bottom picture is not my unit. It just shows the connectors on the back of the heatmiser slimline v3.

    I am yet to connect mine. So I guess I'm asking how I swap the cables from mine, into the one marked n l a1 a2.

    Thanks
     
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