Thermostat Question

[Grinning Grandad]

I'm replacing my mother's temperamental thermostat with a Hive one. The boiler is currently being fed through the receiver (which is being fed from a fused spur a couple of inches away).
I intend to put a new flex in from the fused spur direct to the hive L&N (doing away with the connectors) and feed the boiler from the same terminals.
Looking at the diagram (and reading the info on here) I am connecting the A (black) to Common on the Hive and B (grey) to 3 (NO) on the Hive.
I was wondering what the purpose of the red link is on the current receiver as the diagram has nothing going into it.

 

[stem]

The link does absolutely nothing. The two L terminals are already connected together internally.

 

[Grinning Grandad]

The link does absolutely nothing. The two L terminals are already connected together internally.

Thank you, it doesn't look like it can be doing anything, I appreciate the confirmatiom

 

[stem]

I would guess whoever installed it assumed that it required an L connecting to both terminals so added the loop. It's not the first time I've seen it.

 

[Madrab]

The addition live connector is there to allow a Live to be bridged over to the other side of the stat and then a single SL could be sent to the boiler. Avoids having to try and jam 2 wires into the same small terminal, which they had done anyway.

As suggested, the installer probably thought that the live (brown) from the FCU needed to be bridged over to the other L to power the stat but it's already internally connected.