Bald Loonie or other Honeywell and Trane Gurus,
From Austin, Texas....just had a 3-ton Trane XL15i AC, XV80 indoor system, and a HW VP IAQ thermostat installed....based in large part on the knowledge gleaned from this forum.
Two interrelated problems still at this point, described below. I suspect the stat may not have been properly installed but don't know for sure.
Problem 1: I set the thermostat at a 45% humidity level. But the system only comes on when the temp goes above the setting (usually at 77 or 78). The humidity reading on the thermostat varies from 48-50%, which is not bad but it is not the level desired and not what the stat is set for. My understanding was the the system would operate until the desired humidity level was reached and would go as much as 3 degrees below stat setting, but that is not happening.
Problem 2: My understanding was the thermostat would/could control the variable fan speed of the XV80 to dehumidify. But that doesn't appear to be happening either. When the fan comes on, it always goes through the SAME 3-step ramp up and 2-step ramp down process (low-medium-high-medium-off). I expected that if humidity were still high after temp level is reached, the stat would just trigger a low or medium fan speed till the humidity setting is reached. The only way a 45% humidity level can be reached is if I set the temp at 74-75, but is too cold for us and less efficient.
Is this the way the VisionPro IAQ (with the XV80) is supposed to work or there likely a wiring or setup problem between stat and the XV80? Any tips,tricks, or questions I could share with the installer, who I hope to get back here tomorrow?
Seems like any ol thermostat could do what the IAQ is currently doing.