3M 3M-08 Install Manual - Power Options

Note:

If you have electric heat, turn the 

thermostat over

and find the GAS/ELECTRIC heat 

selector on the back of the control

unit(see diagram below). Move the 

selector jumper to the ELECT 

position.

1) The 3M-08 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-08 can run on the C wire if available.                  24VAC ONLY

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.

Power Options

Check Unit cont.

Congratulations, you have successfully installed your unit. Please 

proceed to the OPERATING Guide to initialize the new thermostat.

PG

 9

PG

 10

Gas/Electric jumper