VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM
68-0287—1 24
aHumidification only operates in heating or when last call was for heating.
bDehumidification only operates in cooling or when last call was for cooling.
cMust be set up in installer setup (ISU 379) for dehumidification with air conditioning.
dInstaller setup (ISU 406) must be setup for Ventilation in high humidity or nothing will happen.
eOnly with whole house dehumidifier.

Multi-Stage Heat and Cool Control

In a multi-stage system, while maintaining setpoint, several
factors affect when the next stage energizes, such as load
conditions, environmental conditions, P+I control, and home
insulation. The next stage energizes when the thermostat
senses the previous stage is running at 90% capacity. This
operation is droopless control.
User Setup
Follow these steps to enter the User Setup:
1. Press and release the System key.
2. Press and hold the center blank key for approximately
five seconds until the screen changes.
3. Release the center blank key when the screen on the
thermostat matches the screen below.
Table 7. Indoor Air Quality Operation.
System Setting Call For Action
Last call Energize
terminalsHeat Cool
Auto Humidification HUM1 and HUM2 CloseaNothingaNone
Auto Dehumidification NothingbDHM1 and DHM2 closeeNone
Auto Dehumidification NothingbDHM1 and DHM2 opencYc and Gc
Auto Ventilation VNT1 and VNT2 Close VNT1 and VNT2 Close None
Heat or Em.Heat Humidification HUM1 and HUM2 Close NA None
Heat or Em.Heat Dehumidification VNT1 and VNT2 ClosedNA None
Heat or Em.Heat Ventilation VNT1 and VNT2 Close NA None
Cool Humidification NA NothingaNone
Cool Dehumidification NA DHM1 and DHM2 closeeNone
Cool Dehumidification NA DHM1 and DHM2 opencYc and Gc
Cool Ventilation NA VNT1 and VNT2 Close None
SCHED HOLD CLOCK SCREEN
FAN
ON
AUTO
A
M
THU
SYSTEM
EM HEAT
OFF
COOL
Following
Schedule
Inside
M23502
Humidity
DONE CANCEL
TUE
SYSTEM
EM HEAT
OFF
COOL
CHANGE FILTER UV LAMP HUMIDIFIER PAD
Following
Schedule
Inside Set To
M23503
Humidity
D
O
NE
M22440