I'm replacing a Danfoss RX1 receiver and the existing wiring on the backplate is in the photo (the cable on the left goes to a fused spur). The boiler is a Vaillant Ecotec Pro 28.
The manual suggests linking terminals L and 1. Do I need to do that?
Here's the Wiser manual:
The manual suggests linking terminals L and 1. Do I need to do that?
Here's the Wiser manual:

