Advanced Thermostat Operations
44 ENV-VST-C - Operation / Reference Guide
Turning on the Humidification and Dehumidification Systems
Humidification and dehumidification systems enable you to add humidity to or remove humidity from the air. You can
set the humidify and dehumidify setpoints on the Program Mode or Away Mode screens. See the Program Screensection
on page24 and the Away Mode Screen section on page26 for more information. Perform the following steps to turn on
the humidification and dehumidification systems:
1. From the Main screen, press Mode/Select to access the Thermostat Mode screen.
2. Use the navigation buttons to select Settings, and press Mode/Select. The Settings screen appears.
3. Use the navigation buttons to select Advanced Settings. Press Mode/Select to access the Security Code screen.
4. Enter the security code, and select Enter to access the User Preferences screen. See the Entering the Security Code
on page30 for more information.
5. Use the navigation buttons to highlight More, and press Mode/Select to access the second User Preferences screen.
6. On the second User Preferences screen, use the navigation buttons to highlight More, and press Mode/Select to
access the third User Preferences screen.
7. Use the navigation buttons to highlight Advanced Setup, and press Mode/Select to access the Advanced Setup
screen.
8. Use the navigation buttons to highlight More, and press Mode/Select to access the second Advanced Setup screen.
9. Use the navigation buttons to highlight More, and press Mode/Select to access the third Advanced Setup screen
(FIG.45).
10. Use the navigation buttons to highlight Humidification System, and press Mode/Select to toggle the system to
Yes.
11. Use the navigation buttons to highlight Dehumidification System, and press Mode/Select to toggle the system to
Yes.
12. Use the navigation buttons to highlight Exit, and press Mode/Select to return to the Main screen.
Turning on Comfort Recovery
Comfort Recovery enables you to indicate whether the heating/cooling system recovers gradually from an energy-saving
setpoint temperature to a comfort setpoint temperature. By incrementing the setpoints gradually, the heating/cooling
system activates in advance of the actual set program time so the area is at the desired temperature at the start of the
program time.
Comfort Recovery begins two hours before the next programmed setpoint. During the Comfort Recovery period, every
15 minutes the thermostat computes the difference between actual room temperature and the desired temperature of the
next setpoint and set the setpoint to the halfway point between the two.
For example, if the room temperature is 60 and the next setpoint is 70, Comfort Recovery begins and the thermostat
moves the setpoint to 65. Fifteen minutes later, the thermostat checks the setpoints again and finds the room temperature
is 63 and the next setpoint still at 70, so it changes the setpoint to 66. Fifteen minutes later, the thermostat checks the
setpoints again and finds the room temperature is 66 and the next setpoint still at 70, so it changes the setpoint to 68.
FIG. 45 Advanced Setup screen (3 of 3)