Mechanical to digital thermostat

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Hi there I have an old honeywell mechanical thermostat T6360B that I'm trying to change to a digital one THR840D the old one is numbered 1-3 and an earth the new box is a x b y c.

I thought being the same company would be the same any help much appreciated thanks
 

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There should be a wiring diagram with the new stat.

I suspect on the cover of the old one there is a wiring diagram of that too.

On the old one, I would GUESS 1 is live, 2 is neutral, 3 is switched live - but it's only a guess and we need to check before we do anything.
 
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Is the earth not needed either parked safely to?
Thanks so much for the help u guys are brilliant
 

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