3M 50 - Manual (Page 15)

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MODE Button
The mode button sets the 3M-50 to HEAT, COOL, AUTO, or OFF modes. Press it once to step to the
next mode. If the 3M-50 is in OFF and you want to return to the mode you were previously in, touch
the OFF indicator on screen.
COOL - This will operate the cooling portion of your HVAC system until it is turned off.
HEAT - This will operate the heating portion of your HVAC system until it is turned off.
AUTO - The 3M-50 TRUE AUTO mode switches automatically between heat and cool throughout
the year. Unlike other manufacturers, the 3M-50 TRUE AUTO has no temperature or time limitations
(Patent pending), just program your desired HEAT and COOL temps and select the AUTO mode. The
3M-50 will switch from HEAT to COOL as needed.
OFF- This takes your HVAC system “off-line” and it will not control HVAC functions. In this mode your
house may experience extreme heat or cold.
FAN Button
The fan control is normally in AUTO mode, meaning that the fan operates automatically with the
HVAC system and the thermostat. When the fan button is pressed the fan goes ON; the fan will run
continuously in this manual override until switched back to AUTO by pressing the FAN button again.
[NOTE: Fan
ON function is available in the OFF mode to allow simple ventilating.]
Simple Screen
This display mode limits the amount of information on screen and limits the functions to just the +/-
arrows and the MENU button. Set mode to OFF and ...
Hold down the PROGRAM button for 12 seconds to access the limited display screen.
Hold down the PROGRAM button for 12 seconds to leave the limited display screen.