You have to manually disconnect the small plastic fittings at the flow meter and drain it, as well as the return hose at the panel. There will be water in both the hose and the sight glass if you do not. I learned the hard way a couple of years ago.
The sight glass froze over the winter and broke - very expensive part from Dessalator.
Pumping pink through the LP pump is all you need to do otherwise based on the many times I have winterized my watermaker (230V only).
Phantom, A54 #44