Thermostat wiring

[Deejie]

Hi all,
I am trying to replace my Drayton dial stat with a new wireless Salus RT310 (on my Alpha boiler). Of course, they're not just a straight swap. Can anyone on here guide me to wiring the Salus from my switchbox (pictured below).

The Drayton is wired quite simply: L (Red), N (Blue), CALL (Black), Earth (Y/G)

But, the Alpha uses a switchbox with the following terminals (the Twinzone system I believe):

The Salus wiring diagram is as follows:

Any advice or help very welcome
Cheers,
Dan

 

[ericmark]

NO is call, and as volt free needs link L to Com as shown in bottom diagram.