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Complete, Easy To Read  
INSTALLATION AND  
OPERATING INSTRUCTIONS  
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In the winter, set the system switch to HEAT to control your heating  
system.  
OPERATING INSTRUCTIONS  
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In the summer, set the switch to COOL to control your air conditioner.  
Press either the TEMPERATURE UP or DOWN key in order to show  
the current SET TEMPERATURE.  
Press TEMPERATURE UP or DOWN keys again until your desired  
temperature is displayed. The display will show the current room  
PSD111 SERIES  
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DIGITAL ELECTRONIC THERMOSTAT  
temperature again after two seconds.  
Press the light bulb button to illuminate the display. Adjusting the  
temperature will keep the display lit until no button has been pressed  
for over ten seconds.  
In spring and fall or when windows are open, you can set the system  
switch to OFF.  
HEAT  
OFF  
COOL  
Easy as  
1–2–3  
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Installs Easily Choose Heat or Cool Set Temperature  
Setting the FAN switch to AUTO automatically runs your system’s fan  
during heating and cooling.  
Setting the FAN switch to ON runs your system’s fan continuously even  
without heating or cooling.  
LUX PRODUCTS CORPORATION • Mt. Laurel, New Jersey 08054, USA  
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WARNING: Use Energizer® or DURACELL® Alkaline Batteries Only.  
Energizer® is a registered trademark of Eveready Battery Company, Inc.  
N O T E  
DURACELL® is a registered trademark of The Gillette Company, Inc.  
52000  
The FAN switch works only if your system provides a wire for the  
thermostat’s “G” terminal.  
I M P O R T A N T !  
Please read all instructions carefully before beginning instal-  
lation and save for future reference. Before removing any  
wiring from your existing thermostat, its wires must be labeled  
with their terminal designations. Ignore the color of the wires  
since they may not comply with any standard.  
INSTALLATION  
Please read all instructions carefully before beginning installation.  
C A U T I O N  
Thank you for your confidence in our product. To obtain the best results  
from your investment, please read this manual and acquaint yourself with  
your purchase before installing your new thermostat. Then follow the  
installation procedures, one step at a time. This will save you time and  
minimize the chance of damaging the thermostat and the systems it  
controls. These instructions may contain information beyond that required  
for your particular installation. Please save for future reference.  
Turn off electricity to the appliance before installing or  
F
OF  
servicing thermostat or any part of the system. Do not turn  
electricity back on until work is completed.  
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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.  
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All wiring must conform to local codes and ordinances.  
This thermostat is designed for use with 24 volt and millivolt systems.  
The thermostat should be limited to a maximum of 1.5 amps; higher  
current may cause damage to the thermostat. If you are in doubt, call  
your HVAC contractor.  
COMPATIBILITY  
TEMP UP  
MODE  
The unit can be used with  
most 24 volt gas, oil or electric  
heating and air conditioning  
systems, gas millivolt heating  
systems, and single stage heat  
pumps. It cannot be used with  
120 volt heating systems or two  
stage heat pumps. Ask your  
dealer for other LUXPRO  
thermostats to control those  
systems.  
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Your thermostat is a precision instrument. Please handle it with care.  
TOOLS REQUIRED  
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#1 Phillips screwdriver (small)  
Drill with 3/16-in. (4.8mm) bit  
Wire stripper/cutter  
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FAN  
MODE  
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BACKLIGHT  
RESET  
TEMP DOWN  
THERMOSTAT LOCATION  
On replacement installations, mount the new thermostat in place of the  
old one unless the conditions listed below suggest otherwise. On new  
installations, follow the guidelines listed below.  
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Remember that your PSD111 may be mounted vertically or horizontally  
FEATURES  
when determining the optimal location.  
Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the  
floor, and in a room that is used often.  
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Slim design may be vertically or  
horizontally mounted  
Large easy to read backlit display  
Fan switch for system or continuous  
fan operation  
Simple temperature Up or Down keys  
will display and adjust the Set  
Temperature.  
Temperature displays in F° or C°  
Temperature differential SWING settings  
of 0.25 and 0.5  
Selectable 2 or 5-Minute Minimum  
Run/Off time provides short cycle and  
compressor protection  
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Do not install it where there are unusual heating conditions, such as: in  
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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.  
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Patent # 6,951,306  
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Do not install the unit until all construction work and painting has been  
completed.  
© COPYRIGHT 2006 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED  
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WIRING DIAGRAMS  
These diagrams are provided for new installations or un-referenced  
wires.  
C A U T I O N  
Read instructions carefully before removing any wiring from existing  
thermostat. Wires must be labeled before they are removed. When removing  
wires from their terminals, ignore the color of the wires since they may not  
comply with any standard.  
HEATING SYSTEMS  
COOLING SYSTEMS  
W
H
V
4
5
W
RH  
W
RH  
RH RC  
R
P
R
O
V
I
D
E
D
P
R
O
V
I
D
E
D
J
U
M
P
E
J
U
M
P
E
B
O
B
O
RC  
Y
REMOVING THE OLD THERMOSTAT  
Y
W
R
R
1. Switch electricity to the furnace and air conditioner  
R
Y
G
RC  
C*  
V
F
RC  
Y
OFF; then proceed with the following steps.  
6
G
F
2. Remove cover from old thermostat. Most are snap-on  
types and simply pull off. Some have locking screws on  
the side. These must be loosened.  
G
G
C
TC  
B
C B TC  
OPTIONAL  
OPTIONAL  
C
C
ALL COMMON WIRES ARE OPTIONAL  
AND MAY BE TAPED OFF  
ALL COMMON WIRES ARE OPTIONAL  
AND MAY BE TAPED OFF  
* IF Y AND "C" ARE BOTH PRESENT,  
"C" IS THE COMMON WIRE  
3. Note the letters printed near the terminals. Attach labels (enclosed) to  
each wire for identification. Label and remove wires one at a time. Make  
sure the wires do not fall back inside the wall.  
HEATING / COOLING SYSTEMS  
HEATING / COOLING SYSTEMS  
4- or 5-WIRE WITH ONE TRANSFORMER  
5- or 6-WIRE WITH TWO TRANSFORMERS  
W
H
V
4
5
W
H
V
4
5
W
RH  
W
RH  
4. Loosen all screws on the old thermostat and remove it from the wall.  
RH RC  
B**  
O
R
RH  
B**  
O
P
R
O
V
I
D
E
D
DO NOT CONNECT  
DO NOT CONNECT  
R
J
U
M
P
E
J
U
M
P
E
A "B" WIRE HERE  
A "B" WIRE HERE  
E
M
O
V
MOUNTING THE PSD111 ON THE WALL  
UNLESS YOU ARE SURE  
THAT IT IS CORRECT  
UNLESS YOU ARE SURE  
THAT IT IS CORRECT  
B
O
B
O
RC  
Y
1. Decide whether the thermostat will be mounted vertically or horizontally.  
OPTIONAL  
OPTIONAL  
E
D
R
R
RC  
Y
R
RC  
Y
Y
G
C*  
6
C*  
6
C A U T I O N  
F
G
F
G
G
Be careful not to drop the unit or disturb any electronic parts.  
C
B
TC  
C B TC  
OPTIONAL  
OPTIONAL  
C
C
ALL COMMON WIRES ARE OPTIONAL  
AND MAY BE TAPED OFF  
ALL COMMON WIRES ARE OPTIONAL  
AND MAY BE TAPED OFF  
* IF Y AND "C" ARE BOTH PRESENT,  
* IF Y AND "C" ARE BOTH PRESENT,  
"C" IS THE COMMON WIRE  
"C" IS THE COMMON WIRE  
2. Strip insulation 3/8 in. (9.5mm) from  
** IF A "B" WIRE IN YOUR SYSTEM IS A  
** IF A "B" WIRE IN YOUR SYSTEM IS A  
SYSTEM COMMON, THEN CONNECTING IT  
AT THE "B" TERMINAL MAY CAUSE  
DAMAGE TO YOUR SYSTEM  
SYSTEM COMMON, THEN CONNECTING IT  
AT THE "B" TERMINAL MAY CAUSE  
DAMAGE TO YOUR SYSTEM  
W
wire ends and clean off any corrosion.  
R
3. Fill wall opening with non-combustible  
insulation to prevent drafts from affecting  
the thermostat.  
TYPICAL 2 WIRE HEAT HOOKUP  
24 VAC AND MILLIVOLT SYSTEMS  
TYPICAL 3 WIRE HEAT HOOKUP  
WHERE THIRD WIRE IS FAN WIRE  
GAS  
GAS  
4. Cup the thermostat with one hand behind the thermostats display.  
Separate the unit from it’s base  
W
W
VALVE  
VALVE  
AC  
AC  
RH  
XFMR  
24  
RH  
XFMR  
24  
P
R
O
V
I
D
E
D
P
LINE  
LINE  
J
J
U
M
P
E
R
O
V
I
VAC  
VAC  
U
M
P
plate using the tabs protruding  
B
B
E
R
D
E
D
from it’s body with the other hand.  
O
RC  
Y
O
RC  
Y
R
N O T E  
G
G
FAN  
If you are mounting the base to a soft material like plasterboard or if you  
are using the old mounting holes, the screws may not hold. Drill a 3/16-  
in. (4.8mm) hole at each screw location, and insert the plastic anchors  
provided. Then mount the base as described below.  
C
C
OPTIONAL  
OPTIONAL  
COMMON  
COMMON  
TYPICAL 4 WIRE HOOKUP  
HEATING AND COOLING  
GAS  
W
VALVE  
TAB  
AC  
RH  
XFMR  
P
R
O
V
I
D
E
D
24  
LINE  
J
U
M
P
E
VAC  
B
O
BASE  
R
RC  
Y
COOL  
COMPRESSOR  
G
FAN  
C
OPTIONAL  
COMMON  
TYPICAL 5 WIRE HOOKUP  
HEATING AND COOLING  
TYPICAL SINGLE STAGE HEAT PUMP  
HEATING AND COOLING  
TERMINALS  
USE "B" OR "O"  
GAS  
W
W
BUT NOT BOTH  
VALVE  
ATTACHING WIRES  
AC  
RH  
RH  
XFMR  
24  
P
R
O
V
I
D
E
D
R
E
LINE  
J
U
M
P
E
J
U
M
P
E
VAC  
5. Route the wires through the large hole in the base  
plate by the terminal block. Hold the base against the  
wall, with the wires coming through. Position the base  
for best appearance (to hide any marks from an old  
thermostat). The terminal block should be either to the  
right of or below the routing hole. Attach the base to the  
wall with the two screws provided.  
M
O
V
E
B
B
O
RC  
Y
B
O
RC  
Y
CHANGEOVER  
VALVE  
OR  
O
R
R
24  
24  
VAC  
D
VAC  
AC  
AC  
XFMR  
XFMR  
LINE  
LINE  
COOL  
HEAT  
COMPRESSOR  
COMPRESSOR  
G
G
FAN  
FAN  
C
C
OPTIONAL  
COMMON  
OPTIONAL  
COMMON  
NOTE: ADD JUMPER BETWEEN "W" AND "Y"  
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C A U T I O N  
CALIBRATION  
Your thermostat is carefully calibrated at the factory, and will measure  
temperature to within ±1°. However, you can adjust the reading of  
your thermostat:  
Do not allow wires to touch each other or parts on thermostat.  
Terminated wires must be trapped between black spacer and  
brass terminal. Securely tighten all 8 electrical terminal screws.  
INSTALLATION OPTIONS  
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Slide the MODE switch to OFF.  
There are five options which are  
set by jumpers on the rear of the  
units circuit board. Four are set by  
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Press and hold the Up and Down buttons until the display shows a  
single digit between +5F°(+3C°) and -5F°(-3C°).  
J4 J3 J2 J1  
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A GROUP OF numbered jumpers.  
Then the Up or Down buttons may be used to adjust the reading.  
They are:  
Elec Gas  
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The display will return to normal operation after 4 seconds without  
an adjustment.  
JUMPER POSITIONS  
(FOR REFERENCE ONLY  
J 1: The minimum run time  
NOT SHOWN TO SCALE)  
jumper J1 sets the minimum length  
of time that the thermostat must  
remain with Heat or Cool either on  
or off before it will automatically  
BATTERIES/ MAINTENANCE  
switch to the alternate On or Off state. This feature prevents short cycling,  
and provides compressor protection for cooling units. Choices are 2 or 5  
minutes.  
1. Remove fresh batteries from their carton.  
2. Remove body of thermostat as described during installation.  
3. Remove the used batteries if present.  
4. Install two new Energizer® or DURACELL® "AA" size alkaline batteries in  
the battery compartment. Observe the polarity marking shown in the  
compartment.  
J 2: The temperature format: jumper selects whether your thermostat  
displays temperatures in Celsius or Fahrenheit.  
J 3: This Jumper determines whether the display will be horizontally or  
vertically oriented.  
J 4: This Jumper controls the “swing” or temperature variation in the  
home. Using the smaller number results in more stable temperature, while  
the wider setting is provided as a more energy efficient alternative. Users  
of forced hot water systems may find the 0.25 setting more comfortable.  
WARNING: Use Energizer® or DURACELL® Alkaline Batteries Only.  
5. Place the body back on the wall.  
6. Using a small Phillips screwdriver  
press the RESET button which is  
between the Up/Down arrow  
button. Within 90 seconds the  
thermostat will begin to display the  
CLOSE  
5 min  
F
Horizontal  
Swing=0.5  
OPEN  
2 min  
C
Vertical  
Swing=0.25  
J1  
J2  
J3  
J4  
BATTERY COMPARTMENT  
room temperature.  
The table above is printed on the circuit board. To change the jumper  
position, pull it straight off the pins it covers. Replace the jumper over one  
or both pins as determined by your desired setting. To prevent its loss, a  
jumper may be placed over one pin only for the open positions. After  
settings have been changed, press the small unmarked RESET button on  
the front of the thermostat for the changes to take effect.  
N O T E  
REPLACE BATTERIES WHEN “LOBAT” APPEARS IN THE DISPLAY  
OR AT LEAST ONCE A YEAR.  
TECHNICAL SERVICE  
Gas/Electric J umper: The fifth jumper enables or disables the  
thermostats ability to control the system fan when in heat mode. It has  
three pins. When used with a furnace, it should be positioned over the left  
two pins. The furnace must then control the system fan. When used with  
an electric heating system, it should be positioned over the right two pins  
and the thermostat will provide power at its G terminal to activate the  
system fan.  
If you have any problems installing or using this thermostat, please  
reread the instructions carefully. Technical Service is available through our  
Technical Assistance Dept. If you require assistance, please call our offices  
between 8:00 a.m. and 4:30 p.m. Eastern Standard Time, Monday through  
Friday. The number is (856) 234-8803 or visit our online technical support at  
www.luxproproducts.com.  
INSTALL BATTERIES  
WARRANTY  
For detailed instruction, see BATTERIES/MAINTENANCE to install  
batteries at this time.  
Limited Warranty: If this unit fails because of defects in materials or  
workmanship within three years of date of original purchase, LUX will, at  
its option, repair or replace it. This warranty does not cover damage by  
accident, misuse, or failure to follow installation instructions. Implied  
warranties are limited in duration to three years from date of original  
purchase. Some states do not allow limitations on how long an implied  
warranty lasts, so the above limitation may not apply to you. Please return  
malfunctioning or defective units to the participating retailer from which  
purchase was made, along with proof of purchase. Please refer to  
"TECHNICAL ASSISTANCE" before returning thermostat. Purchaser  
assumes all risks and liability for incidental and consequential damage  
resulting from installation and use of this unit. Some states do not allow  
the exclusion of incidental or consequential damages, so the above  
exclusion may not apply to you. This warranty gives you specific legal  
rights and you may also have other rights which vary from state to state.  
Applicable in the U.S.A. only.  
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Turn the power back on to your heating and/or air conditioning system.  
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Verify that the system and it’s fan are operating properly. When set to a  
high temperature, the heating system should provide warm air after a  
short time. Likewise a cooling system should provide cool air after a short  
time. Usually sound from the furnace and air conditioning units can be  
heard while they are running. The rush of moving air should be heard  
within a short time after either has been started.  
N O T E  
If you have an electric system and the blower does not operate after  
installation, find the electric/gas heat jumper on the back of the body as  
indicated in the following diagram. Move the jumper from the center and  
right pins, to the center and left pins.  
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The Installation is now complete.