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LUX® TX9100U UNIVERSAL PROGRAMMABLE THERMOSTAT  
QUICK START INSTALLATION GUIDE  
53000  
1
2
F
OF  
SHUT OFF POWER  
LABEL WIRES  
Turn OFF the power to both  
your heating and cooling units  
at the circuit breaker.  
BEFORE removing thermostat, label your  
4
C
5
6
A
E
AU  
F
existing wire connections with the labels  
provided. Cover any “unused” wires with  
electrical tape.  
C1 DH  
H
H1 H2 MDO  
L
O
OT OT  
TC  
R
V
R
RH  
T
V
3
INSTALL NEW THERMOSTAT BASE  
INSTALL ALKALINE BATTERIES  
4
W3  
E G Y R O W2 B L  
O
Restore the power to your heating and cooling units.  
Install new Alkaline batteries into the thermostat. NOTE:  
Remove your old thermostat. Install the new thermostat  
base (using the same mounting holes if possible). Connect  
the wires matching the exact terminal letters from your wires,  
to the terminal letters on the new thermostat.  
Please use Duracell or Energizer Alkaline batteries ONLY for  
all LUX® thermostats requiring batteries. BE SURE TO  
NOTE: If you have both a “B” and an “O” wire, see the notes  
on the back page of this instruction sheet.  
CHANGE THE BATTERIES AT LEAST ONCE A YEAR, to ensure  
consistent and reliable operation of your heating/cooling  
system.  
5
TEST HEAT AND COOL OPERATION  
6
HEAT  
OFF  
Set the system switch to the  
desired temperature mode.  
SET THE CLOCK...  
SET THE TEMPERATURE PROGRAMS  
COOL  
Adjust the SET Temperature to the  
desired comfort setting.  
Thank you for choosing LUX Products, and  
we hope that you will enjoy using your new  
thermostat along with its many energy  
saving features.  
72F  
70F  
68F  
(NOTE: this set point will only be  
temporary until the program  
periods are saved in memory.)  
DOWNLOAD THE FULL INSTRUCTION MANUAL  
This sheet is just a quick start guide, and there are many more instructions and topics covered in the full version of the manual for  
this product. The complete version PDF can be obtained at “http://www.luxproducts.com”. Click on SUPPORT, then  
INSTRUCTION MANUALS.  
ONLINE THERMOSTAT TROUBLESHOOTING GUIDES  
If you are having difficulties with the installation or the operation of your thermostat, please review the online troubleshooting  
guides for your model. These troubleshooting guides cover the most common symptoms that you may observe. The  
Troubleshooting Guides are located at “http://www.luxproducts.com”. Click on SUPPORT, then TROUBLESHOOTING GUIDES.  
CONTACT OUR TECHNICAL SUPPORT DEPARTMENT  
If you require need assistance with your product, please contact our Technical Assistance department between 8:00AM and  
4:30PM Eastern Time from Monday through Friday, at 856-234-8803. Our website also permits you to email your technical  
at the top of the page.  
© 2012 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED  
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TX9100U QUICK START WIRING GUIDE  
53000  
WIRING DIAGRAM NOTES:  
CAUTIONS AND WARNINGS:  
Label every wire terminal designation on your existing thermostat  
wiring before removing your old thermostat.  
The thermostat requires batteries to operate and failure or sub-  
standard performance of the batteries may impair or prevent the  
correct operation of the thermostat. Use Duracell or Energizer alkaline  
batteries ONLY for all Lux thermostats requiring batteries. BE SURE TO  
CHANGE THE BATTERIES AT LEAST ONCE A YEAR. Failure to follow  
these battery instructions could result in property damage and/or  
personal injury.  
Ignore the color of the wires since they may not comply with any  
standard. Please connect wires using the terminal letter designations.  
WARNING: All wiring must conform to the local codes and ordinances  
that are in your particular location.  
The electrical rating for this thermostat is 1.5 Amps per terminal, with a  
maximum total load of 3.0A for all terminals combined.  
If the information provided in the following wiring diagrams does not  
clearly represent or match your system, please refer to the full version  
of the manual which can be obtained from our website, or contact us  
before removing your existing thermostat wires.  
The thermostat contains parts which may wear out through use and are  
susceptible to failure if over-loaded or used in a manner other than as  
indicated in the documentation.  
All of the dashed wires shown in the wiring diagrams are either  
optional, or their usage depends upon your specific system type or  
brand. For example: Diagram #1 shows the fan wire as optional. If  
your system does not have a fan, than this terminal will not be used.  
Check unoccupied residences regularly to ensure that all systems are  
operating properly.  
Check any heating/air-conditioning system including this product  
before operation and at regular intervals.  
The optional “C” terminal is used for powering the thermostat by the  
24-volt system, using the System Common wire. This can be used  
alone, or in addition to installing batteries as a backup. NOTE:  
connecting the System Common wire to the thermostat is not  
necessary for heating and cooling to function properly.  
Electrical interference, static electricity, failure or substandard  
performance of batteries, wiring defects in the installation and/or  
characteristics of the connected HVAC devices may prevent the system  
from regulating heating and cooling as anticipated.  
If your old thermostat has both a “Y” and “C” wire both present, then  
“C” is most likely a System Common wire.  
The thermostat is a sensitive device and dropping the product can  
cause damage to critical components. If the product is dropped or  
shaken violently during transport or installation then it should be  
replaced immediately.  
For Heat Pump systems, you will use either the “O” terminal or the “B”  
terminal on this thermostat, but not both. If your old thermostat has  
both an “O” and a “B” wire present, then “B” is likely a System  
Common wire and may be connected to the “C” terminal. Connecting  
a System Common wire to this thermostat’s “B” terminal may damage  
the thermostat, and also your heating and cooling system.  
Persons with physical or mental limitations may not be able to  
promptly respond to a malfunction of the heating/air-conditioning  
system.  
Some Heat Pump systems have a wire for AUX electric heat (usually  
W2), and also a separate wire for Emergency electric heat (usually E).  
This thermostat uses the W2 terminal for both AUX and Emergency  
Heat. Tape off your “E” wire, and confirm that all components function  
without it.  
All residents should be made aware of the potential in any system for  
malfunctions that could cause continuous heating or cooling and  
should be familiar with the operation and location of the  
heating/cooling appliance on/off switch.  
Read the instruction manual completely before installing the  
thermostat. Additional information is available at our website  
luxproducts.com. You should consult a qualified HVAC technician or  
an electrician if you do not fully understand the installation  
instructions.  
**NOTE: The Black Terminal Letters Shown Below Are Standard, The Gray Terminal Letters Are Brand-Specific  
4, 5 WIRES  
#4  
1-HEAT AND 1-COOL (NON Heat-Pump)  
2, 3, 4, 5 WIRES  
#1  
HEATING ONLY (2-WIRES = USE “RH” & “W1”)  
Factory RH-RC Jumper Wire Installed  
Factory RH-RC Jumper Wire Installed  
Y1 RC RH  
G
Y1  
RC  
RH  
W1  
A
Y2  
O
B
W2  
C
G
W1  
A
Y2  
O
B
W2  
C
G
F
Y
R
W
C
X
FAN WIRE  
MAY NOT BE  
PRESENT IN  
ALL SYSTEMS  
Y1  
6
RH  
RC  
V
W1  
4
G
F
R
W
W2  
C
X
B*  
RH  
V
W1  
4
B*  
O
O
P
T
I
P
T
I
SYSTEM COMMON  
O
N
A
L
O
N
A
L
SYSTEM COMMON  
STAGE  
1
STAGE  
2
SYSTEM 24V  
TRANSFORMER  
FAN  
AIR  
CONDITIONER  
SYSTEM 24V  
TRANSFORMER  
HEATER  
FAN  
HEATER  
4, 5, 6, 7 WIRES  
#5  
5, 6 WIRES  
#8  
HEAT PUMP System (WITH EMERGENCY HEAT)  
2-HEAT AND 2-COOL (NON Heat-Pump)  
CUSTOMER INSTALLED Y1-W1 Jumper Wire  
Factory RH-RC Jumper Wire Installed  
** Use “O” or “B” Terminals,  
Never Both  
Factory RH-RC Jumper Wire Installed  
Y1 RC RH  
G
W1  
A
Y2  
O
B
W2  
C
G
Y1  
RC  
RH  
W1  
A
Y2  
O
B
W2  
C
G
F
Y
R
W
Y2  
W2  
C
X
G
F
Y
R
O
W2  
C
X
Y1  
6
RH  
V
W1  
4
Y1  
6
RC  
RH  
V
W3  
W1  
W
B*  
B*  
O
O
P
T
I
P
T
I
O
N
A
L
O
N
A
L
SYSTEM COMMON  
SYSTEM COMMON  
STAGE  
1
AIR CONDITIONER  
STAGE  
2
STAGE  
STAGE  
SYSTEM 24V  
TRANSFORMER  
FAN  
1
2
SYSTEM 24V  
TRANSFORMER  
REVERSING  
VALVE  
AUX / EMERG.  
HEAT  
FAN  
HEAT PUMP  
HEATER