Mini split electrical question

Mini split electrical question

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Hello,
I got one of the pioneer mini splits for a little guest house we built at the farm. I had my electrician wire up the 220 for the outside unit. But I have a couple of questions about the power and signal wire that runs to the inside unit.
When you run the power to the inside unit, does the stab end of each wire get screwed down with both inline terminals? There are two screws where each wire goes. I assume it does but cannot find an answer to it. Also, there are only 4 wires but 5 wire holes. Just don’t use number 5?
Thanks,
hh

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Mini split electrical question