And finally, here’s the wiring diagram for the Tstat10 to the existing cabling. You’d need to take off the existing backplate and install the Tstat10 backplate. The wiring is all low voltage so just tape off the 24VAC hot while you are working. Better yet power down the equipment at the main power switch of the unit.
Notice the jumper from terminal 16 to 17. The thermostat relays are isolated from the thermostat power by default. Most of the time you will just jumper the 24VAC over to the relay common on terminal 17 which in turn is fed back to the equipment through relays K1 to K5.
All that remains to be done now is create a program for the application. There’s an example program for two heat/ two cool on this forum which can be easily tweaked for single stage cool, two stage heat. I see that its not 100% complete so will work on that later this week.
All the inputs on the Tstat10 are spares so if you can get a wire in from the stat to the equipment you can monitor all sorts of parameters on the heat pump like a dirty filter alarm, air flow switch, current sensor showing the power draw, refrigerant temperatures and outside air temperature to name a few.