I am a homeowner and I have recently finished a major renovation on my house. My HVAC contractor installed two American Standard Freedom-90 Comfort-R 12 speed variable speed furnaces in the house. There are 4 levels and each furnace runs two zones, one on each level. Each zone has an Aprilaire 8363 thermostat.
Now I have noticed that the furnaces simply kick on and off like an old fashioned furnace. I do not detect these 12 speeds I have paid extra for. I mentioned this to my contractor and he said he made a few adjustments and now I should detect the different speeds, but I do not think I do. I feel maybe I have the wrong thermostats, ones that do not control the variable speeds. He says it's the furnace that selects the speed, not the thermostat. If the thermostat is set very high above the current temperature, the furnace will "detect" the larger temperature request and blow faster, and if I set it slightly above the current temp it will blow slower. This implies the thermostat somehow "transmits" the set temperature to the furnace. I was not aware that the thermostat could do this.
I would like to make sure that I am getting what I paid for, a multi speed HVAC system. I'm not sure I am. I think it's the thermostats that are wrong. Does anyone know if the 8363 is the right thermostat? Is my HVAC guy correct in telling me how the speeds would be selected? Also how would it provide two different speed requests to the two zones given that each furnace only has one blower?
Please help an uneducated consumer. Thanks.