I have a Water Furnace Geothermal Heat pump with radiant in floor as Stage 1. Stage 2 heat is using our ductwork (normally for A/C) to supply hot air heat when the thermostat detects a lag or significant temperature difference. There is no stage 3. The furnace itself (not the thermostat) senses through the Symphony software when Stage 4 heat is needed. That is an IBC boiler that injects hotter water directly into the radiant tank , based on really cold ambient temperatures. I live in upstate NY where it often drops below zero in winter. I also have central A/C (1 stage).
Zone-wise, my house has 5 zones for heat only radiant 1 stage only in individual rooms. These thermostats that now have C wires and the Nest 2020 thermostat is working great on each of the 5 zones. My other 2 zones are the main ones and I tried to install the Nest 2020 thermostat on my 2 complicated heat/A/C zones, described above, but the compatibility checker says no. I have 7 wires on my current Honeywell thermostat with top labels conventional and bottom for heat pump:
Black: labelled W2 top labelled Aux on bottom
Green labelled G top labelled G on bottom
White labelled W labelled O/B on bottom
Blue labelled C labelled C on bottom
Yellow labelled Y labelled Y on bottom
Red labelled R labelled R on bottom
Brown labelled Rc labelled Rc on bottom
What thermostat do I need for these 2 zones? Is the Nest 2020 an option at all? If not, is the Nest Learning Thermostat an option. Any help would be greatly appreciated. I prefer to keep everything on the Nest system.
Thanks to everyone for listening.
Randy01
