No, electric strip heat can't be added to a model that came from the factory without it.
KHH2672R, THH2672R and the THH3672R. All of these are also heat pumps.
On all 26,000 btu and larger models the old e-prom must be re-used on the new board. Both the indoor and outdoor main boards have e-proms.
It is a variable speed, DC compressor.
The 26K (BTU's) and larger models, will slow down to 9,500 BTU's.
The 9K and 12K models will slow down to 3,000 BTU's.
The 18K and 24K models will slow down to 4,000 BTU's.
The flexi-multi models will slow down to 9,800 BTU's.
The indoor units get power from the outdoor units and are the same voltage.
All of them have an adaptor that goes to ¾" PVC.
Yes, the remote sends a signal every 3 minutes. As long as the remote is left in a location were it can communicate with the indoor unit, it will restart.
Measure the lines and check the installation manual for how many feet your model comes charged for. If you have a leak the remaining 410A must be pulled out and new refrigerant weighed in. You can't charge by superheat but SANYO models do run at a low superheat sometimes, 0-5 degrees. Also the gauge port connection is 5/16. The Ritchie adaptor P/N is 19173.
Some models will.
All temperatures are dry bulb and in Fahrenheit.
Push the ACL button in for 3-5 seconds, this will "reboot" the remote. If it still does not work, replace the remote.
They all use an electric expansion valve, which is located in the outdoor unit. It is controlled by the outdoor circuit board.
Yes, and they must be insulated separately.
Yes, in cooling they run on low speed and in heat they run in low low. When the unit is turned on there is no way to make the fan cycle off.