Nest install help.

Also here is thermostat
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https://www.linkpicture.com/view.php?img=LPic5fc979a76fa661612984927
 
Yeah pretty straight forward install.

L/N/E are simple.

Basically your 1 and 4 connection is a normally open switch that closes when the stat calls for heat which in turn fires up the boiler.

From a quick Google they would go into connections 2 & 3 on the nest.
 
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