hi. i would like to ask sifu here. For inverter units, from my understanding, there will be additional wire right? Non-inverter only has 3 wiring but inverter there will be 4 wirings where the additional one will be connected to the outdoor unit? The reason I am asking is that my contractor just install the cooper pipe and wiring. I noticed there is 4 wiring but am unsure whether compatible with the inverter?

Here are the pictures I managed to capture.

Any idea if is these are for inverter?

Thank you. Fuh what a relief at least my contractor install it correctly. Thank you alot. Need to learn more from you in electrical