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3M 3M-08 Install Manual

Made by: 3M
Type: Install Guide
Category: Thermostat
Pages: 16
Size: 1.66 MB

 

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Location

Caution

Tools 

To avoid electrical shock and to prevent damage to the furnace, air conditioner, 
and thermostat, disconnect the power supply before beginning work. 
This can be done at the circuit breaker, or at the appliance.

C  A  U  T  I  O  N

Your thermostat is a precise instrument.
Please handle it with care.
Turn off electricity to the appliance before installing or 
servicing thermostat or any part of the system. Do not 
turn electricity back on until work is completed.
Do not short (jumper) across electric terminals at 
control on furnace or air conditioner to test the system. 
This will damage the thermostat and void your warranty.
All wiring must conform to local codes and ordinances.
This thermostat is designed for use with 24 volt AC and 
millivolt systems. The thermostat should be limited to a 
maximum of 1.0 amps; higher amperage may cause     
    damage to the thermostat. 

On replacement installations, mount the new thermostat in place of the 
old one if possible. 
On new Installations, follow the guidelines listed below. 
Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the 
floor, and in a room that is used often.
Do not install it where there are unusual heating conditions, such as: in 
direct sunlight; near a lamp, radio, television, radiator register, or 
fireplace; near hot water pipes in a wall; near a stove on the other side 
of a wall.

Do not locate in unusual cooling conditions, such as: on a wall separating 
an unheated room; or in a draft from a stairwell, door, or window.
Do not locate in a damp area. This can lead to corrosion that will shorten 
thermostat life. 
Do not locate where air circulation is poor, such as: in a corner or an 
alcove; or behind an open door. 
Do not install the unit until all construction work and painting has been 
completed.
This thermostat does not require leveling.

You will need  #1 Phillips screwdriver (small) and
Drill with 3/16-in. (4.8mm) bit for this installation.

Good

5ft.

(1.5m)

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 1

PG

 2

Install Guide 3M-08

 


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Remove old unit

Label Wires to Old Unit

Mount the 3M-08

Separate front from back of unit. Grasp the 

front of the unit and the back of the unit and  pull apart. 
The thermostat body away from the base.
Hold the base against the wall, with the wires coming 
through the opening below the terminal block. 
Position the base for best appearance 
The 3M-08 can be mounted vertically or horizontally. 
chose the position that best suites your wall.
Attach the base to the wall with the two screws 
provided.
If you are mounting the base to sheet rock or if 
you are using the old mounting holes, use the 
plastic anchors provided. 

Drill a 3/16-in.(4.8mm) 
hole for the insert at 

each screw location, 
then mount the base.

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 3

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 4

Terminal Block

Switch electricity to the furnace and air conditioner OFF; 
then proceed with the following steps.
Remove cover from old thermostat. Most are snap-on types and simply pull 
off. Some have locking screws on the side or front. These must be loosened.   
Note the letters printed near the terminals. 
Carefully attach labels (enclosed) to each wire. Label the wires one at a time.  
You must have all the wires labeld before you procede. 

Remove the wires from the terminals of the old thermostat.
Make sure the wires do not fall back inside the wall.  
Wind them around a pencil to keep them from falling.
Remove the old thermostat from the wall. Fill wall 
opening with fiber glass insulation to prevent drafts.  

Caution

DO NOT REMOVE WIRES FROM OLD THERMOSTAT UNTIL YOU HAVE 
CAREFULLY LABELED THEM, WITH LABELS PROVIDED.
THERE IS NO STANDARD COLOR CODE FOR THESE WIRES.

 


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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.  

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 6

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 5

Go To Page 13

Go To Page 14

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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.

 


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When you have finished making connections. 
Re-attach the  the body onto the base by 
pressing it firmly onto the base. 
                                              

Install Batteries

Wiring complete 

Check Unit

The 3M-08 requires 2AA batteries if the C-wire 
is not available in your furnace installation. 
Switch MODE switch to OFF and 
the FAN switch to AUTO.
Remove the control unit form the wall unit.  
Install 2 AA alkaline batteries according to the 
polarity noted in the compartment.
 (DO NOT USE Rechargable Batteries)

NOTE: Replace the batteries when the red LOW battery LED 
indicator blinks or once a year. 
Caution: The thermostat will go "off" if the batteries die. This exposes 
your house to unexpected heat or cold and should be avoided. 

Follow these procedures to verify you have correctly installed the unit.

To check Fan: (If you connected the G wire - fan relay)
Switch the FAN switch to the ON position. 
Verify that air is blowing from the system. 
Return to AUTO position for normal operation.

To check HEAT mode:
Set the mode switch to HEAT. Set the fan switch 
AUTO.
Turn TEMP DIAL counter clockwise to its stop. 
Allow the system 5 min to respond.  
Verify that heat is blowing from the system.

To check COOL mode:
Turn TEMP DIAL clockwise to its stop. 
Allow the system 5 min to respond.  
Verify that cool air is blowing from the system.

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 7

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 8

AA

AA

Temperature 

Dial

HEAT/COOL
Mode Switch

Fan 

Switch

 


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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

 


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 11

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 12

STEP 1 - Connect the R (or RH) wire to 

the RH terminal on the thermostat. 

This connects the Heater Power to the 

thermostat.

STEP 2 - Connect the W wire to the W 

terminal on the thermostat.

This connects the heater control line to the thermostat.

Your Heater is now concected to the thermostat.

STEP 1 - Connect 

the R (or RH) wire to the RH terminal 

on the thermostat. This connects to 

the Heater Power .

STEP 2 - Connect the W wire to the 

W terminal on the thermostat.

This connects the heater control line to 

the thermostat.

STEP 3 - Connect the G wire to the G 

terminal on the thermostat.

This connects the Fan to the thermostat.

Your system is now conected to the thermostat.

Return To Page 7

Return To Page 7

2 WIRE Heating

(GAS MILLIVOLT or 24vac

NOTE: Wires marked with the dotted line are optional.

NOTE: Wires marked with the dotted line are optional.

3 WIRE 

FURNACE

jumper
wire

Heat 
Power

Heat

W

G

RH

C

FAN

Thermostat

jumper
wire

FURNACE

HEAT

Thermostat

R

W

C

HEAT 
Power

 


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PG

 14

PG

 13

STEP 1 - Connect the wire to the 

Y terminal on the thermostat. This 

connects to the Cooler compressor.

STEP 2 - Connect the RH or R wire 

to the RH terminal on the thermostat. 

This connects  the Heater/Cooler 

Power.

STEP 3 - Connect the W wire to the W terminal on the 

thermostat.  This connects to the heater control line.

STEP 4 - Connect the wire to the G terminal on the 

Thermostat.  This connects to the Fan.

Your HVAC system is now conected to the thermostat.

STEP 1 - Remove the orange 

Jumper wire.

STEP 2 - Connect the wire to 

the Y terminal on the thermostat. 

This connects to the Cooler 

compressor.

STEP 3 - Connect the RH wire to the RH 

terminal on the thermostat. This connects to the 

Heater Power .

STEP 4 - Connect the RC wire to the RC terminal on 

the thermostat. This connects to the Cooling Power .

STEP 5 - Connect the W wire to the W terminal on the thermostat.

This connects to the heater control line.

STEP 6 - Connect the wire to the G terminal on the Thermostat.

This connects to the Fan.

Your HVAC system is now conected to the thermostat.

Return To Page 7

Return To Page 7

5 WIRE 

4 WIRE 

NOTE: Wires marked with the dotted line are optional.

NOTE: Wires marked with the dotted line are optional.

HVAC SYSTEM

jumper
wire

 Heat 

Power

Heat

W

G

RH

C

FAN

Y

Cool

Comp

Thermostat

HVAC SYSTEM

Remove
jumper
wire

HEAT 
Power

Heat

W

G

RH

RC

C

FAN

Y

Cool

Comp

COOL 
Power

Thermostat

 


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The 3M-08 can be used with most 24 volt gas, oil or electric 
heating and air conditioning systems, or gas millivolt heating 
systems. It cannot be used with 120 volt heating systems or heat 
pump systems.  Ask The Home Depot for other thermostats to 
control those systems.

The 3M-08 is digital. You can program your desired Heat and cool 
temperature by setting the dial. The unit uses no harmful mercury.

A 5-minute minimum off time in COOL protects your air 
conditioning system from being damaged.

Two "AA" batteries (not included) are used to run the thermostat 
in some installation. "C" wire installations require no batteries.

3M-08 Features

PG

 15

1006-007

Customer Support: 888-607-5824   

 or Visit our website  www.radiothermostat.com/filtrete

 


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