3M 30 - Manual (Page 11)

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To UNLOCK , Press MENU.
Touch and hold icon for 5 seconds for 2 bars (if not there already).
Then touch and hold the icon for another 5 seconds. Each 5 second touch and hold must be separate.
Return
HOME by touching the icon.
CALIBRATE
Your thermostat was accurately calibrated at the factory to ±1° F of actual ambient
temperature. You do have the option, however, to change the display temperature to match that of a
previous thermostat, or to match another thermostat already in your home. The range of change is from
-6°F to +6°F or -3°C to +3°C.
To change your Thermostat Calibration, touch MENU and then touch CALIBRATE.
Use the + / - to adjust the displayed temperature up or down, as desired.
The DELTA FACTOR that appears on the screen will also automatically increase or decrease for
each 0.5° (F or C) adjustment so you can see your change. The large display will show the modified
temperature reading that will be displayed on the HOME screen and used as the new room temperature.
Press HOME to return to the Home screen.
DIFF (Used for 2 stage normal or heat pump with auxillary only, not on screen for single stage).
The differential is the number of degrees between the room temperature and the Target Temperature at
which the 2nd stage will be used. Default is 2°F.
Touch MENU and then DIFF. use the arrows to set the DIFF.
Recommend DIFF be set to 2°F for very cold climates and to 4°F for warm climates.