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Nest Thermostat E with Honeywell CM900

Discussion in 'Plumbing and Central Heating' started by singh01211, 5 Jul 2019.

  1. singh01211

    singh01211

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    Hi,

    I’d like to apologise in advance as I’m a complete novice to this stuff. I’m trying to learn how to do wiring/installations and not rely on someone doing it for me so please be patient with me.

    I’ve bought the new Nest Thermostat E to replace my Honeywell CM927 controller. I’ve located the receiver for the controller which is next to my boiler. When I went to install the new Heatlink E which came with the Nest E, the wire labels weren’t the same.

    So my Honeywell receiver has wires for L N and then A B. The Heatlink E asks me for a C and NO wire. Through doing some research online, I’ve found that the A wire is the C and the B wire is the NO. My only question is, what happens with the L and N wire. Are they the power source to the receiver and will not plugging them into my Heatlink do anything? (Pics below)

    Sorry if I the question I asked is simple, just trying to learn how this all works for the future. Thank you all

    Honeywell receiver
    71C73ABC-03C0-48F5-86C4-BF0BEE4AEF20.jpeg

    Heatlink E
    FC4CE19F-8A41-4740-924B-F0E7111EE264.jpeg
     
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  3. ianmcd

    ianmcd

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    Your Honeywell required a L&N to power it, your nestE uses 2x Batteries you will have to isolate the L&N and just use the two switching wires as you described in your post
     
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  4. singh01211

    singh01211

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    Thank you mate, I appreciate your reply.
     
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  5. DIYnot Local

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