09-04-2009, 02:27 AM
I have a Lennox variable speed blower and Lennox III Harmony Zone board (2 zones). I am having a installer install 2 Honeywell IAQ Vision Pro 9421 Thermostats (with module). Does anyone know if the zone board and the IAQ are compatable to control the slowdown of the variable speed blower for dehumidification? My installer indicates it is possible if not zoned but not sure if zoned.