After reading this board I had my installer put in a 8321 VisionPro last fall. Well, the setback bit doesn't seem to be working just right. One thing I thought this T-stat was supposed to do is to look at how long setback recovery took on previous days, and use that to make sure that the temp is at the setpoint AT the schedule time. (The cheapo setback I used before STARTED the unit at the schedule time.)
Well, with the recent heat here, I find that the durned thing can't recover until hours after the schedule time.
Evening setpoint is 78 @ 6:30, daytime is 85. By the time I get home, it is reading 83. It doesn't seem to get it down to 78 until 10PM or so.
I know that 85 is a high daytime setback, but I thought the thermostat was supposed to be smart enough to figure this out and start recovery at the correct time.
On a not-scorching-day, I looked at the stat @ 6PM, the inside was 81, and it STILL hadn't turned the unit on. No way is a properly sized-unit going to cool by three degrees on a hot day in half an hour. Right?
I went ahead and put the thing on perm. hold for the past few 100+ days because of this.
Is there some setting my installer forgot to turn on, or is the "Adaptive-ness" limited to .5 hr or so?
It seemed to work okay in the winter...