Advanced Thermostat Operations
42 ENV-VST-C - Operation / Reference Guide
Activating the Internal On-board Sensor
The thermostat comes installed with an internal on-board temperature sensor, which is activated by default when the
thermostat is installed. You can use this sensor to report room temperature, or you can activate both this sensor and the
External Temperature sensor, at which point the thermostat reports an average temperature based on the temperature
readings from each sensor. You can also turn off the internal on-board sensor if you do not want to use it. Perform the
following steps to activate the internal on-board sensor:
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 (FIG.43).
8. Use the navigation buttons to select Internal Temperature Sensor, and press Mode/Select to activate it.
9. Press Mode/Select to toggle whether you want the internal sensor turned on or off.
Activating the On-board Humidity Sensor
The thermostat comes installed with an internal on-board humidity sensor. You can use this sensor to report room
humidity. You can also turn off the internal on-board humidity sensor if you do not want to use it. Perform the following
steps to activate the on-board humidity sensor:
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 (FIG.43).
8. Use the navigation buttons to select Humidity Sensor, and press Mode/Select to activate it.
9. Press Mode/Select to toggle whether you want the humidity sensor turned on or off.
Setting the Date and Time on the Thermostat
The thermostat enables you to set the date and time, which displays on the main screen. Perform the following steps to
set the date and time on the thermostat:
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.