topic Re: Learning Thermostat Compatibility with Lennox Harmony II Zoning Controls on a Heat Pump in Nest Thermostats

Learning Thermostat Compatibility with Lennox Harmony II Zoning Controls on a Heat Pump

OsterfeldBJ — Tue, 13 Sep 2022 22:05:08 GMT

Moved into a new home and I would like to move up to the Learning Thermostat. The current setup is a heat pump with backup electrical heat and dual zone control. (2 thermostats - 1 up/1 down) It is a Lennox system from @ 2004 with the Harmony II zone controller. Equipment model numbers and thermostat wiring below. Is there any way to wire this up to a Learning Thermostat without replacing the existing equipment? I was thinking the * terminal may a solution because I have an O and B on the existing, and obviously can't shove two wires into one terminal on the Nest.

Thanks,

Brian

Air Handler	Lennox	CBX32MV-036-230-6-02
Aux Heater	Lennox	EC829(EH)-9CB-P
Heat Pump	Lennox	HPXB15-036-230-1

Wiring on Harmony II Thermostat

Re: Learning Thermostat Compatibility with Lennox Harmony II Zoning Controls on a Heat Pump

Ryan_G — Sun, 25 Sep 2022 12:51:51 GMT

Hi OsterfeldBJ,

Thanks for reaching out here in the Google Nest Community.

With the kind of HVAC system you're using, it is recommended to have a Nest Pro or your local HVAC technician to install the Nest Thermostat for you.

Regards,

Ryan

Re: Learning Thermostat Compatibility with Lennox Harmony II Zoning Controls on a Heat Pump

Jeran — Wed, 28 Sep 2022 22:24:02 GMT

Hey there OsterfeldBJ,

Did you have any more questions or need any additional help?

Thank you,
Jeran

Re: Learning Thermostat Compatibility with Lennox Harmony II Zoning Controls on a Heat Pump

Jeran — Fri, 30 Sep 2022 15:14:43 GMT

Hey OsterfeldBJ,

Did you have any more questions or need any additional help? If not, I'll go ahead and lock up this thread in 24 hours.

Just checking up,
Jeran