"Zone Forced Air - Lennox Harmony III Zone Control Board"
By Ron Stultz
17 Jan 2022
Summary: The Lennox Harmony III has a few marginally beneficial features over the more popular Honeywell Zone Control Board but is less well known by heating, ventilation, and air conditioning (HVAC) service technicians and is harder to configure without multiple technician visits.
Click link below to see my YouTube on Harmony III