potterton performa 28 room thermostat question

Hus

Joined
2 Dec 2010
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Location
Essex
Country
United Kingdom
I have integral timer in my Boiler. Can someone please help me with how to install Siemens RAA20 Room Thermostat?

I know there are 2 terminals 1 & 2
230v out
230v in

Do I need to connect Siemems RAA20 to 230v out (Just one wire)

 
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