Hive to Vaillant ecotec plus 837 wiring help

hi , after a bit of guidance on this.
fitting a hive to ecotec plus 837.
I see L & N at top of current receiver should go to L&N on hive
Just not sure where the current L1 and LX wires should be moved to on the hive .?
Any help gratefully received. Thanks in advance.

 

1 and 3 doesn't matter which way round.

 

thanks a lot ! , forgot to say it is a single channel receiver ( does that change your info )

 

No