Changing The Type Of Fossil Fuel; Activating The External Sensor; Activating The Internal On-Board Sensor - AMX ENV-VST-C Instruction Manual

Advanced Setup screen (1 of 3)
FIG. 42
8. With HVAC System highlighted, press Mode/Select to indicate the type of HVAC system you are using.

Changing the Type of Fossil Fuel

The thermostat gives you the option to indicate the type of fossil fuel your HVAC system uses. You can choose from Gas and
Electric. Perform these steps to change the type of fossil fuel:
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
page 30 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. 42).
8. Use the navigation buttons to select Fossil Fuel Type, and press Mode/Select to indicate the type of HVAC system you are
using.

Activating the External Sensor

If you have an external sensor installed with the thermostat, you must indicate if the sensor is installed indoors or outdoors. If you
activate both this sensor and the Onboard Temperature sensor, the thermostat reports an average temperature based on the
temperature readings from each sensor. You can also turn off the external sensor if it is connected, but you do not want to use it.
Perform the following steps to activate the external 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
page 30 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. 42).
8. Use the navigation buttons to select External Temperature Sensor, and press Mode/Select to activate it.
9. Press Mode/Select to indicate the location of the external sensor. You can choose from Indoor or Outdoor. Selecting one of
these choices activates the external sensor. You can select Off if you want to deactivate the sensor.

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.
ENV-VST-C - Instruction Manual
Advanced Thermostat Operations
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