WiFi thermostat install

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29 Nov 2017
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United Kingdom
Hi there, I’m looking to replace my old analog thermostat with a new WiFi one I bought however I will need to do a little rewiring and some help would be very welcomed. I only have 2 wires for the old thermostat so I will need to relocate and rewire. Can anyone help as to what wires should go where. Thank you
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You don't appear to give any details of your existing room thermostat. However, if the "only two wires" from the thermostat to which you refer to are connected to terminals 1 & 2 shown below.....

Room Stat.JPG

....then the wires will go to the terminals marked 'dry contact' 1 and 2 at your new thermostat. It's a simple on/off switch and as you can see, the symbols in both diagrams are the same.


In addition, the new thermostat requires a permanent 230V mains supply to power it. This should be connected to terminals 3 & 4 below and should come from the same 3A fused supply that supplies the boiler.

Capture 1.JPG

They can be connected to the N and L at the 'Mains Terminal Block' provided you can access them without opening up a room sealed part of the boiler to do so. If the terminals are inside a room sealed compartment, [This should only be opened by an RGI (Gassafe) engineer who can make sure it is properly sealed up again] then it is possible to take the supply directly from the boiler's fused spur L & N 'load' terminals instead.

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