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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)

PG

 1

PG

 2

Install Guide 3M-08

Summary of Contents for 3M-08

Page 1: ...at 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 fireplac...

Page 2: ... mount the base PG 3 PG 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 tim...

Page 3: ...ostat 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...

Page 4: ...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...

Page 5: ...l 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 OPERAT...

Page 6: ...o 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 ...

Page 7: ... 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 G wire to the G terminal on the Thermostat This connects to th...

Page 8: ...ems 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...

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