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Gas-Electric Selection
• If you have Electric Heat or a Heat Pump you must
place the Gas/Electric jumper in the ELECT position
(thermostat controls the Fan).
• If you have Gas Heat the
Gas/Electric Jumper should be
in the GAS position (furnace
controls the Fan ).
Install Batteries
The 3M-10 requires batteries to operate your
system.
Switch MODE switch to OFF and the FAN switch to
AUTO.
•
Insert 2 AA alkaline batteries according to the
polarity noted in the compartment.
NOTE: Replace the batteries once a year
or when this low battery indicator appears
on the right side of the unit.
Power Options
1) The 3M-10 can run on batteries only. (2AA Alkaline)
The batteries will last well over 1 year. If the batteries are not replaced the thermostat will
stop working.
2) The 3M-10 can run on the C wire if available.
As shown in the wiring diagrams, The C wire is the other side of the 24VAC heating
transformer. If the C wire is used, the batteries are not needed.
Please be aware of the following power options
Gas/ Electric
jumper
5
PG
Circuit
Board
6
PG
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