My first question is where is you professional pump installer?
“Service and installation should be performed by an authorized service
That pump is made for a well that is around 900’ deep. So a pump installer must have installed the pump. Only the basic functions can be set on that unit without the specialized remote that most Grundfos installers are required to have.
So my next questions is what are you trying to protect the pump from? There are much easier ways to protect from dry run or rapid cycle conditions.
There are also easier ways to protect from voltage problems, if that is your goal.
My experience with pump protectors is the more things it protects from, the more nuisance trips you will have. Voltage is rarely a problem with single phase pumps, and phase unbalance is only for three phase pumps. Usually protection from dry run or rapid cycling is all that is needed, and eliminates a lot of nuisance trips that leave you out of water.
If you can’t get any help from your installer, I will read that manual and try to help you out.