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Install guide 3M-22  
Caution  
• Your thermostat is a precise instrument, 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.  
ENGLISH  
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Install guide 3M-22  
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.  
Caution  
You will need a small Phillips screwdriver and possibly a drill  
with 3/16-in. (4.8mm) bit for wall mounting.  
Tools  
Location  
Replacement installations - mount the new thermostat in place of the old one.  
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.  
PG  
1
• 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  
Good  
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.  
5ft.  
(1.5m)  
PG  
2
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Remove old unit  
IMPORTANT : LABEL ALL WIRES  
BEFORE DISCONNECTING THEM!  
• 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. Attach  
labels (enclosed) to each wire for identification.  
Read instructions carefully before removing any wiring from existing thermostat.  
Wires must be labeled before they are removed. THERE IS NO STANDARD  
Caution  
COLOR CODE. When removing wires from their terminals, ignore the color of  
the wires since these may not comply with any standard.  
PG  
3
• Label the wires one at a time. You must label all the wires before  
you proceed. With all wires labeled, remove them from the old unit.  
• Make sure the wires do not fall back inside the wall. You can wind  
them around a pencil to keep them from falling.  
• Loosen all screws on the old thermostat and remove it from the wall.  
• Fill wall opening with non-combustible insulation to prevent drafts.  
Prepare wires  
• You will need at least 2.6" of wire for each  
of your connections to the 3M-22.  
• If you do not have enough wire, splice  
additional wire to allow enough slack.  
2.6"  
W
• Fan out wires below the hole as shown.  
Trim  
PG  
4
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PG  
5
Before you Connect Wires  
Please follow these guidelines for safe and secure  
wire connections.  
• Easy Terminals do not require stripping the wire.  
• Clip any bare wire from previous installation.  
• Take care not to damage the labels for each wire in handling.  
• Fan wires out as illustrated with 3M-22 below the wall opening.  
• Wires will dress behind the 3M-22 and up over the terminal area.  
• Use the Step-By-Step diagram as your guide.  
• Do not bunch wires behind 3M-22. Feed slack back into the wall  
opening.  
Do not allow wires to touch each other or parts on thermostat.  
Caution  
• Insert the wire in the terminal and tighten  
the screw securely.  
Jumpers  
• You will need to set Configuration  
Jumpers per the Step-By-Step  
diagram. A needle-nose plier may be  
required to modify jumper positions  
W
What wires do you have?  
Determine which step-by-step wiring  
diagram below 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  
air conditioning equipment and read the label there.  
If you have a wire marked "C" it is optional. If you do connect it, the  
thermostat will draw power from the C wire. This extends battery life.  
PG  
6
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PG  
7
Find the set-up diagram for your system  
• Find the referenece page with your wiring  
diagram and jumper set-up information.  
C W RH Go To Page 15  
2 Wire  
Heat  
Remember, the  
C wire is optional.  
C W Y RH G C W Y RH RC G  
C W RH G  
3 Wire  
Heat  
4 Wire  
Heat/Cool  
5 Wire  
Heat/Cool  
W RH A  
3 Wire  
Zoned  
Hot Water  
W
W
W
Go  
To  
PAGE 22  
Go To Page 16  
Go To Page 17  
Go To Page 18  
C B or O Y RH G  
C B or O W2 Y RH G C W2 W Y Y2 RH G  
5 Wire  
Heat Pump  
4 Wire Heat Pump  
w/o Aux Heat  
2 stage Cool  
2 stage Heat  
w/ Aux Heat  
B
B
W
2
Go To Page 19  
Go To Page 20  
Go To Page 21  
•
If you combination of wires is not above you can use the  
wiring table on pages 24-25 to determine your connections,  
or call our USA support line at 1-888-607-5824 for help.  
PG  
8
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Mount the 3M-22  
Wall  
3M-22  
• Hold the 3M-22 against the wall, with the wires coming  
over the top above terminal block. The 3M-22 will cover the  
hole in the wall.  
• Position 3M-22 for best appearance. Use the optional stand-  
offs if more space for wires is needed behind the 3M-22.  
• Attach the base to the wall with the 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  
Wires  
each screw location, then mount the base.  
W
W
Wall anchor  
PG  
9
Install AAA Batteries  
• The 3M-22 requires 2 AAA batteries to operate .  
• Switch MODE switch to OFF and the FAN switch to AUTO.  
• Install 2 AAA alkaline batteries according to the polarity noted in  
the compartment. LCD segments will go on.  
• Press the RESET button (under top cover) to clear transient  
program memory. NOTE: Replace the batteries when this LOW  
battery indicator appears on the display or once a year.  
• Replace top and bottom covers on unit.  
-
AAA  
+
-
AAA  
+
PG 10  
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PG 11  
Check Unit  
Temperature  
Display  
Follow these procedures to verify you  
have correctly installed the 3M-22.  
TEMP  
UP button  
Mode  
Switch  
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 to AUTO.  
Fan  
Switch  
TEMP  
DOWN button  
• Using the TEMP + button raise the Target Temp to 90deg.  
Allow the system 2 min to respond.  
• Verify that heat is blowing from the system.  
To check COOL mode:  
• Set the mode switch to COOL.  
• Press the TEMP - button to a temp 5 degrees below the room temp.  
Allow the system 2 minutes to respond.  
• Verify that cool air is blowing from the system.  
Congratulations, you have successfully installed your unit.  
Please proceed to the OPERATING Guide to initialize the 3M-22.  
NOTE: If you have labeled your wires, follow the correct Step-By-Step, and  
these Check procedures do not operate your system call support at  
1-888-607-5824  
PG 12  
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PG 13  
Power Options  
BATTERIES ONLY - This thermostat can run on batteries only using 2AAA  
alkaline batteries. The batteries will last at least 1 year; replace the batteries  
once a year or when the low battery icon comes on the display. If the batteries  
are not replaced, the thermostat will shut off the HVAC and then stop working.  
24VAC - This thermostat can run on the HVAC 24VAC (C wire) if available.  
As shown in the wiring diagrams, the C wire is the other side of the 24VAC  
heating transformer and can be found where the other thermostat wires  
connect at the wall or at the furnace. Do not use the common or ground side  
of the line voltage. If the C wire is used, the batteries are then for back-up in  
case of power loss only and will last much longer. With the C wire connected,  
the thermostat will continue to work if the batteries die or are removed.  
Calibration  
o
NOTE:Your thermostat comes from the factory calibrated to +/- 1 of actual  
temperature. It is an accurate instrument. If you want your thermostat to  
display the same temperature as another thermometer in your home, you  
can adjust its calibration.  
To change the calibration:  
Set the Mode switch to HEAT or COOL.  
Locate the TIME SET button and press it. The  
current calibration factor (+/-) of the 3M-22 will appear  
in the LCD display as well as the modified temp.  
Push the UP or DOWN arrows until the desired  
calibration factor is reached.  
Press HOME to save. The new calibrated temperature  
Calibrate button  
PG 14  
will be displayed on the LCD.  
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2 WIRE HEAT Heating GAS MILLIVOLT or 24vac  
PG 15  
STEP 1 - Connect the R (or RH) wire to the RH terminal on  
the 3M-22. This connects the Heater Power to the thermostat.  
STEP 2 - Connect the W wire to the W on the 3M-22.  
4
6
8
5
7
1 2 3  
This connects the heater control line to the 3M-22.  
SET JUMPERS  
STEP 3 - Set Config jumpers per this diagram.  
GAS Milivolt Heat  
Your Heater is now connected to the 3M-22.  
C
W
R
OPTIONAL POWER  
Please Go To Page 9  
3M-22  
NOTE: Wires marked with  
dotted line are optional.  
C B O W  
2
W Y Y2 RH RC G A  
3 Wire Heat  
PG 16  
STEP 1 - Connect the R (or RH) wire to the RH terminal  
on the 3M-22. This connects to the Heater Power .  
STEP 2 - Connect the W wire to the W terminal on the  
3M-22. This connects the heater control line to the  
3M-22.  
STEP 3 - Connect the G wire to the G terminal on the  
thermostat. This connects the Fan to the 3M-22  
STEP 4 - Set Config jumpers per this diagram. If you  
4
6
8
5
or  
7
1 2 3  
SET JUMPERS  
HVAC SYSTEM  
have Electric heat set 5, if you have Gas or Oil set 7.  
C
W
R
G
OPTIONAL POWER  
Your system is now connected to the 3M-22.  
3M-22  
Please Go To Page 9  
C B O W2 W Y Y2 RH RC G A  
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W Y RH G  
4 Wire Heat/Cool  
PG 17  
STEP 1 - Connect the  
thermostat. This connects to the heater control line.  
STEP 2 - Connect the wire to the terminal on the  
3M-22. This connects to the Cooler compressor.  
STEP 3 - Connect the RH or wire to the RH terminal on  
the thermostat. This connects the Heater/Cooler Power.  
STEP 4 - Connect the wire to the terminal on the  
Thermostat. This connects to the Fan.  
W wire to the W terminal on the  
SET JUMPERS  
4
6
5
or  
7
Y
Y
1 2 3  
8
R
G
G
HVAC SYSTEM  
STEP 5 - Set Config jumpers per this diagram. If you  
C
W
Y
R
G
have Electric heat set 5, if you have Gas or Oil set 7.  
OPTIONAL POWER  
Your HVAC system is now connected  
to the 3M-22.  
Please Go To Page 9  
3M-22  
C B O W2 W Y Y2 RH RC G A  
Terminals  
W Y RH RC G  
5 Wire Heat/Cool  
PG 18  
STEP 1 - Connect the  
W wire to the W terminal on the  
SET JUMPERS  
thermostat. This connects to the heater control line.  
STEP 2 - Connect the wire to the terminal on the  
3M-22. This connects to the Cooler compressor.  
STEP 3 - Connect the RH wire to the RH terminal and the  
RC wire to the RC terminal on the 3M-22. This connects  
the Heater and Cooler Power.  
4
6
5
or  
7
Y
Y
1 2 3  
8
STEP 4 - Connect the  
Thermostat. This connects to the Fan.  
STEP 5 - Set Config jumpers per this diagram. If you  
G wire to the G terminal on the  
HVAC SYSTEM  
RH RC  
G
C
W
Y
have Electric heat set 5, if you have Gas or Oil set 7.  
OPTIONAL  
Your HVAC system is now connected  
to the 3M-22.  
3M-22  
Terminals  
Please Go To Page 9  
C B O W2 W Y Y2 RH RC G A  
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PG 19  
B
or O Y R G  
4 Wire Heat Pump w/o Aux  
STEP 1 - Connect O wire to the O terminal or B wire to the B terminal on  
the 3M-22. (If you have both O and B - connect O wire to O terminal  
DO NOT connect B to B terminal - see pg 24 Trane for B wire terminal)  
This connects the change-over valve.  
SET JUMPERS  
STEP 2 - Connect the Y wire to Y on the 3M-22.  
4
6
8
5
7
This connects the Compressor.  
STEP 3 - Connect the R wire to RH on the 3M-22.  
This connects to the 24vac power.  
1 2 3  
STEP 4 - Connect the G wire to the G terminal on the  
3M-22. This connects the Fan.  
HEAT PUMP SYSTEM  
OPTIONAL POWER  
C
O
B
Y
R
G
STEP 5 - Set Config jumpers per this diagram.  
or  
or  
C B O W  
Your HVAC system is now connected  
to the 3M-22.  
3M-22  
Terminals  
Please Go To Page 9  
2
W Y Y  
2
RH RC G A  
PG 20  
B
or O W2 Y RH G  
5 Wire Heat Pump w/ Aux Heat  
STEP 1 - Connect O wire to the O terminal or B wire to the B terminal on  
the 3M-22. (If you have both O and B -connect O wire to O terminal DO  
NOT connect B to B terminal - see pg 24 Trane for B wire terminal)  
STEP 2 - Connect the W2 wire to W2 on the 3M-22.  
STEP 3 - Connect the Y wire to Y on the 3M-22.  
SET JUMPERS  
4
6
5
7
?
STEP 4 - Connect the R wire to RH on the 3M-22.  
STEP 5 - Connect the G wire to G on the 3M-22.  
STEP 6 - Set Config jumpers per this diagram.  
Set jumper 1 if you have Gas or Oil aux heat.  
1 2 3  
8
HEAT PUMP SYSTEM  
W2  
OPTIONAL POWER  
C
O
B
Y
R
G
Your HVAC system is now connected  
to the 3M-22.  
or  
or  
C B O W  
Please Go To Page 9  
3M-22  
Terminals  
2
W Y Y2 RH RC G A  
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W2 W Y Y2 RH RC G 2 Stage Heat and Cool  
PG 21  
STEP 1 - Connect the  
W2 on the 3M-22. This connects 2 stages of heat.  
STEP 2 - Connect the wire to the terminal and Y2 wire  
to Y2 on the 3M-22. This connects 2 stages of cool.  
STEP 3 - Connect the RH or wire to the RH terminal on  
the thermostat. This connects the Heater/Cooler Power.  
STEP 4 - Connect the wire to the terminal on the  
Thermostat. This connects to the Fan.  
W wire to the W terminal and W2 to  
Y
Y
SET JUMPERS  
R
4
6
8
5
7
or  
1 2 3  
G
G
HVAC SYSTEM  
Y2 RH RC  
STEP 5 - Set Config jumpers per this diagram. If you  
W2  
C
W
Y
G
have Electric heat set 5, if you have Gas or Oil set 7.  
Your HVAC system is now connected  
to the 3M-22.  
OPTIONAL  
POWER  
Please Go To Page 9  
3M-22  
C B O W W Y Y2 RH RC G A  
2
Terminals  
PG 22  
W RH [A?]  
3 Zoned Hot Water - Motor Valve  
Step 1 - based on your valve type  
Motor driven Valve- Connect the R (or RH) wire to the RH  
SET JUMPERS  
terminal on the 3M-22. Connect the W wire to the W terminal  
on the 3M-22. Connect the remaining wire to the A terminal.  
Solenoid valve -Connect the R (or RH) wire to the RH  
terminal on the 3M-22. Connect the W wire to the A terminal  
on the 3M-22. Connect the remaining wire to the W  
terminal.  
1 2 3  
4
6
8
5
7
Motor Valve  
STEP 2 - Set Config jumpers per this diagram.  
W
R
A
Your system is now connected to the 3M-22.  
3M-22  
Terminals  
Please Go To Page 9  
C B O W2 W Y Y2 RH RC G A  
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PG 23  
3M-22 Features  
This thermostat can be used with all millivolt and 24VAC heating and cooling systems. It  
cannot be used with line voltage systems. This thermostat is digital and your desired heat or  
cool temperatures can easily be set on the large screen with the +/- buttons on the front. A  
minimum 4 minute off time protects heating and cooling systems from damage.  
This thermostat uses a new technique called sequential staging for more comfort with  
faster reaction to requested temperature changes. When using a heat pump with Aux heat, if  
the heat pump cannot keep up and/or is  
defective, remove jumper from position 8 and put  
jumper on position 6 and the Aux heat will then  
be your only source of heat. Be sure to restore it  
to PUMP when the pump is again operational as  
aux heat is more expensive than pump heat.  
PG 24  
Wire Reference  
Your Wires  
Filtrete Terminal  
R or V or VR RH and RC Single power for HEAT and COOL  
RH or 4  
RH Power for HEAT (RH not connected to RC)  
RC  
W
RC Power for COOL (RH not connected to RC)  
W Heat control  
W2  
?
Y
Y2  
G or F  
C or X  
E
L
T
W2 2nd stage HEAT or heat pump auxiliary heat  
A 3rd wire for zoned hot water heat (see zoned)  
Y COOL control  
B and O  
NOTE: If  
Y2 2nd stage COOL control  
there are both  
B and O wires  
(Trane pump  
products)  
G FAN control  
C Common 24VAC power (to power thermostat)  
Emergency heat (do not connect, tape off)  
System monitor (do not connect, tape off)  
Outdoor sensor (do not connect, tape off)  
DO NOT  
CONNECT B  
to B terminal,  
connect B to C  
terminal  
B or  
B Heat pump changeover (cool to heat, powered in heat)  
O Heat pump changeover (heat to cool, powered in cool)  
SEE NOTE  
O
B and O  
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PG 25  
Wire Reference cont  
Zoned Systems  
Your Wires  
Filtrete Terminal  
Your Wires  
Filtrete Terminal  
2 wire Zoned Hot Water  
R
W
RH  
W
Lennox Heat Pump  
V or VR or R  
M or Y  
RH  
Y
3 Wire Zoned Hot Water  
Motor Driven Valves  
Y or W or W2  
F or G  
W2  
G
O
C
R
W
RH  
W
R or O  
X or X2 or C  
Y (the 3rd wire) A  
Trane Products [American Standard]  
3 Wire Zoned Hot Water  
Solenoid Valves  
B
C
W or W1  
W2  
R
RH  
A
W
Y (the 3rd wire)  
W
PG 26  
RESET UNIT  
Jumper Reference  
AFTER CHANGING JUMPERS  
GAS/ELEC HEAT  
SELECT  
CLOSED  
OPEN  
Configuration jumpers allow your  
3M-22 to be adapted to many  
different HVAC control applications.  
SINGLE  
HVAC  
POWER(R)  
POWER  
4
ELECTRIC  
POWER RH  
POWER RC  
OR PUMP  
CLOSED  
5
NORM/PUMP/AUX  
SELECT  
AUX  
TYPE  
12hr clock  
24hr clock  
CELSIUS  
FAHRENHEIT  
OR  
GAS OR OIL  
CLOSED  
CLOSED  
OPEN  
OPEN  
HEAT PUMP'S  
HEAT  
CLOSED  
7
PUMP AUX  
6
8
AUX ONLY  
24hr  
CELSIUS  
3
GAS OR OIL  
HEAT  
PUMP  
1
2
CLOSED  
PUMP AUX  
ELECT  
12 hr  
FAHRENHEIT  
OPEN  
Customer Support: 888-607-5824 or  
Visit our website www.radiothermostat.com/filtrete  
Printed in China  
1002-005