[Richard L]

The v3 has markings of 1, 2 & 3 compare to 0, 1 and 2. The manual may not been updated during the v2 to v3 transition.

The wiring guide normally over simplified to get you started. I believe some wiring guides do mention this solder link. For finer configurations you need to refer to the user manual.

Who do you purchase the system from?