How do I access the installer setup (ISU) on a TH6320ZW thermostat?

1. Press and hold Menu button for approximately 10 seconds to enter advanced menu.

2. Press < or > to cycle through System menu.

3. Press Select to cycle through System Setup.

4. Press + or - to change values or select from available options.

5. Press Select to save changes and advance to the next System Setup number.

6. Once you have cycled through all of the System Setup menus,  press "Back" to exit.