3M 22 - Manual (Page 6)

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LOCK
The 3M-22 has a simple LOCK mode to avoid unwanted modifications to the thermostat.
To LOCK:
Press and hold HOME for 3 seconds
The LOCK icon will show on screen, All buttons are locked except HOME.
To UNLOCK:
Touch and hold HOME for 3 seconds. The LOCK icon will go out.
CALIB
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:
Press CALIB (under the icon)
Use the + / - to adjust the displayed temperature up or down, as desired.
The temperature display will show the modified temperature reading that will be displayed on the
HOME screen and used as the new room temperature. Press
to store your settings.