Drayton timeswitch and ariston combi

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Need to check something with you central heating aficionados :)

Pal has an Ariston Micrcombi - http://www.ariston.com/uk/Trade/media/files/629_microCombi_Installation.pdf, I know I can hear the groans from here :) and has got a Drayton LP111 timeswitch - http://www.free-instruction-manuals.com/pdf/p47122159.pdf for it.
The boiler manual (Pg. 12) calls for a single channel volt free timeswitch which the drayton is but looking to confirm the correct connections.
The boiler has a connector block that has a link wire (A) in it. The manual states that this link wire is removed and then connect the volt free switching from the timeclock to this then disconnect the onboard clock.
So presume the timeclock would have the normal 240V L & N connection wired from the mains? The need to confirm which of the other 4 connections in the wall back plate are the volt free switching connectors that should be patched into the connector block?
Would it be 1 as the com and 3 as the on, or 2 as the off and 3 as the on? Or another 2?
Cheers in advance chaps!
 
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1 is common 3 is switched live (on).
L and N from mains.
 
Cheers Mick.

No need for a 240v link to term1 or anything is there? Just terminal 1 and 3 connected to the connector block in the boiler?
 
No links.
Mains to run the clock, volt free for the switching - mix them up and you risk frying the boiler's PCB!
 
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