I have a Trane XV 90 two-stage gas furnace with a two-zone Honeywell
HZ322 control panel. I purchased a new Nest Learning Thermostat 3D gen
and, after following all the instructions, it won’t stop heating during
the first test run. Even though it say...
Thanks for the delayed response. Having heard nothing here I called Nest
for help and they told me my system was wired correctly and I should
call a HVAC pro as the HZ322 system may not be compatible with the Nest
Learning Thermostat. I didn’t want t...
Any help here? I’ve read some more and Nest documentation is
inconsistent but suggests, maybe, that a C wire is needed to make the
Nest Learning Thermostat operate the HZ322 controller. I can run a C
wire from the controller to the thermostat if that...