3M 3M-08 Install Manual - Before You Connect Wires

Before you Connect Wires

Caution

Do not allow wires to touch each other or parts on thermostat. 

Wires must be routed through the hole in the back plate, below the 

terminal block, or they will hit parts on the cover. 

Please follow these guidelines for safe and secure wire connections.

Determine which step-by-step wiring diagram you should use. Make sure your 

wires are labeled. This may require you to find the 'other end' connection for each 

wire on your heating or airconditioning equipment and read the label there.

     If you have a wire maked "C" its connection is optional. If you do connect it the 

thermostat will draw power from the C wire and this will extend battery life. 

Optional Wire Connections 

What Wires Do you Have?

Strip insulation 3/8 in. (9.5mm) from wire ends. 

Take care not to damage the labels for each wire in handling.

Connect labeled wires only to a terminal with corresponding letter.

Bend the wire slightly, insert the wire under the contact plate and 

tighten the screw down onto the wire.  

PG

 6

PG

 5

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R  -  Single source power for heat/cool

       Note: R connects to both RC and 

RH using the Orange jumper

RH or 4 - HEATING POWER

RC - COOLING POWER

W -  HEATING CONTROL

G -  FAN RELAY  

C -  Common side of Heating Power

Y -  COMPRESSOR

O - If you have this wire the 3M-08        

will not control your system.

B - If you have this wire the 3M-08 will 

     not control your system.