Well, I charged it to about 10 deg subcooling - took almost a pound of refrigerant... Not a really noticeable change in performance (temp difference), but it does dial in the efficiency of the refrigeration circuit somewhat and hopefully should squeeze a few more btus out of it.
Messed around with the board. Holding set and ^ gives me evap coil temp. Hold "set" for several seconds gets into setup menu.
From there I can turn the separate spa setting on or off,
I can enable the pump timer feature (but I would have to add a relay or contactor as it's not included on this model,
I can calibrate the inlet water temp sensor,
There is a setting called "dEL" which I am guessing is delay. It is a numerical setting, currently at zero. The compressor control already has a delay timer wired in series with it to prevent short cycling.
and there is a setting called "LOC" that I 'm not sure about. Also a numerical setting, currently at zero.
Strangely, the board is set up to allow me to switch to cooling mode, but there is no reversing valve on the heat pump - thus no cooling capability. There is no option to disable that.
Still no word back from tech support.
Oh, I also took off that ridiculous plastic screen. They really serve no purpose but to hide manufacturing imperfections, and catch cottonwood.