I was watching this video, as I was looking at the diagram below..
The Animated Cycle - YouTube
The location of the coils, (left & right) corresponds nicely to the diagram.
And, since my Condenser coil is on the left in Heating mode, and the Evap coil is on the right,
it was easy to understand the explanation (as it applied to the Sanyo).
The dotted lines are the heating cycle. I think now, I can understand why
the "narrow tube" is used on the Liquid Line and the wide tube needs to be
wide, so it can handle the volume of high pressure gas.
Maybe someday, the box labeled
Indoor Unit will be a gas-to-water HX. (For the Repaired Sanyo outdoor unit).