Replacing an EPH Ember with a Drayton Wiser Kit 3

12 Dec 2010
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I'd appreciate some advice on the following setup.

I currently have an EPH Ember "smart" system consisting of 2 heating zones (combi boiler so no water) and two wireless thermostats. I'd like to replace it with the Drayton Wiser Kit 3.

The EPH wiring looks like this:


which looks like this on the controller backplate:


So, other than the L & N terminals, pins 3 & 4 are the zone 1 and 2 switches, respectively.

The Drayton wiring looks like this:


I appreciate that the wiring centre in the Drayton documentation is different but, as I'm going to be retaining the EPH wiring centre, vales, pump, etc, is it simply a case of replacing the backplate, moving wire 3 > pin 1 and wire 4 > pin 3 and replacing the programmer?

I can't see why I would need to do anything more but it just seems too easy...

Thanks for your help.
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That's it. Occasionally the planets all align

You may not even need to replace the backplate. Just move the connections as you indicated (3->1 & 4->3).

Naturally enough the Wiser will have a phantom channel for Hot Water which can be ignored.
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Worked a charm, thanks guys.

I DID replace the back panel as I thought my OCD would annoy me having a white backplate and a black programmer... before I realised you couldn't actually see it once the programmer goes back on. Oh well, it kept me quiet for a bit...
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