Replace APT Timer with Heatmiser Thermostat

Daniel112

I'm looking to replace an APT Timer for my boiler with a Heatmiser Wifi thermostat. Below is what is currently installed (a simple on/off thermostat for the boiler.)

And I want to replace it with this:

I've opened the cover on the thermostat to have a look at the wiring and this is what it looks like:

And here's it's wiring diagram:

Firstly can anyone tell me if it is voltfree or not? I'm guessing not. Also which of the two wiring diagrams for the new thermostat should I follow? I have an idea but I want to be sure I don't break anything.

Any help is much appreciated!

kirk.

It's the diagram on the left.

The wifi stat has a voltfree contact so needs a link for your setup

The boiler needs a means of isolation nearby , an isolating switch or even a socket

Daniel112

https://www.boards.ie/discussion/comment/121299724#Comment_121299724

Thanks for the help. So terminal 1 cable from the APT Timer will go into A2 on the Heatmiser, Terminal 2 on the APT will go into L on the Heatmiser (with a cable running from L to A1 also to bridge them.) And finally Terminal 3 on the APT timer will go into N on the Heatmiser?

Is that all correct?

There is a fused switch underneath the APT timer (as shown on Photo 1 in my last post) That provides power to the APT timer & Boiler when switched on.

kirk.

Ya that's right