How do I access the installer setup (ISU) on a RTH6350/RTH6450/RET93E/RET95E thermostat?

Instructions:

1. To begin, press and hold the Up arrow and FAN buttons until the display changes.
2. Press Up or Down to change settings.
3. Press NEXT to advance to next function.
4. Press DONE to exit and save settings.

For more information on the ISU, please see pages 5 and 6 in the manual. Click here to download (English)