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 Repairing and Servicing Lennox Products
 Repairing / Servicing of Lennox Zoning Systems
 Upgrading Harmony 2 to Harmony 3
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mdelgadinho

3 Posts

Posted - 01/30/2017 :  6:19:43 PM  Show Profile  Reply with Quote
The discharge air sensor failed on my harmony 2 zoning system so I'm left to upgrade to the harmony 3 system. I've read the manual for both and they appear to install similarly. I know I need 5 wires from the thermostats instead of 4. The wiring for the dampers appear to be the same. I'm most concerned about the wiring from the furnace. I have a G61, but the control board has been replaced. Does anyone have experience doing this and can offer any tips?
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