Lux Products SMART TEMP PSP721U User manual

1. SYSTEM COMPATIBILITY . . . . . . . . 2
2. FEATURES . . . . . . . . . . . . . . . . . . 3
3. TOOLS REQUIRED . . . . . . . . . . . . . 3
4. SELECTING A LOCATION. . . . . . . . . 4
5. REMOVE OLD THERMOSTAT . . . . . . 5
6. MOUNT NEW THERMOSTAT . . . . . . 5
7. WIRING DIAGRAMS . . . . . . . . . . . . 6
8. HARDWARE SETUP OPTIONS . . . . 16
9. COMPLETE THE INSTALL . . . . . . . 18
10. FRONT PANEL ITEMS . . . . . . . . . . 19
11. OPERATING INSTRUCTIONS . . . . . 20
12. ADVANCED FEATURES . . . . . . . . . 24
13. PROGRAMMING . . . . . . . . . . . . . 29
14. BATTERIES AND MAINTENANCE. . . 30
15. TECHNICAL ASSISTANCE . . . . . . . 31
16. WARRANTY. . . . . . . . . . . . . . . . . 31
WARNING: Use Energizer®or DURACELL® Alkaline Batteries Only.
Energizer®is a registered trademark of Eveready Battery Company, Inc.
DURACELL®is a registered trademark of The Gillette Company, Inc.
© 2008 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
PSP721U
SMART TEMP®UNIVERSAL PROGRAMMABLE THERMOSTAT
FOR BOTH CONVENTIONAL AND HEAT PUMP SYSTEMS
INSTALLATION AND OPERATING INSTRUCTIONS
IMPORTANT!
• Please read all instructions carefully before beginning installation
• Label the terminal designations on your existing wiring before
removing your existing thermostat
• Ignore the color of the wires since they may not comply with any
standard.
Thank you for your confidence in our product. To obtain the
best results from your investment, please read these
instructions and acquaint yourself with your purchase. Follow
the installation procedures carefully, and one step at a time.
This will save you time and minimize the chance of damaging
either the thermostat or the systems that it controls. These
instructions may contain information beyond that required for
your particular installation.
52033

2
1. SYSTEM COMPATIBILITY
The electrical rating for this thermostat is 1.5A per terminal,
with a maximum of 2.0A for all terminals combined.
COMPATIBLE WITH:
• Most 24-volt heating and cooling systems
• 1 or 2 stage Heat / 1 stage Cool: Gas, Oil or Electric systems
• 1 or 2 stage Heat / 1 stage Cool: Heat Pump systems
• 3-wire hydronic (hot water) zone valves
• Gas Millivolt heaters
NOT COMPATIBLE WITH:
• 120/240 VAC line voltage systems without a transformer, ask
your LUX dealer for thermostats to control these systems.
NEXT
HOLD
COPY / EMER
COOL
PROGRAM
HEAT
PROGRAM
SET
DAY/TIME
RUN
AIR FILTER
RESET
FAN TEMERATURE
AUTO
ON
HEAT
OFF
COOL
LUX
LUX
5
:
36
72
HEAT
T U
D AY
F
PM
PSP721U
Up / Down Buttons
LCD
Display
Screen
System
Mode
Switch
Fan
Mode
Switch
Quick Reference
Instructions
LUX Rotary Speed Dial®

3
2. THERMOSTAT FEATURES
• Universal Compatibility (Conventional or Heat Pump)
• 7 Day Programming
• 4 Periods per Day
• Quick Copy Programming
• Exclusive LUX Speed Dial®
• Luxlight®EL (Electro-Luminescent) Illuminated Display
• Filter Monitor
• Programmable Keypad Lock
• Optional Smart Recovery
• Temperature Hold
• Temporary Temperature Override
• Energy Star Compliant
• Battery Free Memory Storage
• F/C Temperature Display
• 12/24 Hr Clock Display
• Adjustable Temperature Differential / Cycle Rate
• User Temperature Calibration
• System or Battery Powered
• 5/2 Minute Selectable Minimum Run/Off Time for
Equipment Protection
Please read all of these instructions carefully before
beginning installation, and save this manual for future
reference.
3. TOOLS REQUIRED
• #1 Phillips screwdriver
• Drill with 3/16 in. (4.8mm) bit
• Wire Stripper / Cutter

4
CAUTION:
This thermostat is protected against normal static electric
discharges; however touching a grounded metal object
before touching your thermostat will minimize the risk of
damaging the unit in extremely dry weather.
4. SELECTING A 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.
1. Locate the thermostat on an inside wall, about 5 ft. (1.5m)
above the floor, and in a room that is used often.
2. Do not locate where air circulation is poor, such as in a
corner or an alcove, or behind an open door.
3. Do not install it where there are unusual heating
conditions, such as: in direct sunlight; near a lamp,
television, radiator, register, or fireplace; near hot water
pipes in a wall; near a stove on the other side of a wall.
4. 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.
5. Do not locate in a damp area. This can lead to corrosion
that may shorten thermostat life.
6. If painting or construction work has yet to be completed,
cover the unit completely or do not install it.
WARNING:
• Read instructions carefully before removing any wires from
your existing thermostat.
• All wiring must conform to the local codes and ordinances
that are in your particular location.

5
• Your thermostat is a precision electronic instrument; please
handle it with care to avoid damage.
5. REMOVE OLD THERMOSTAT
1. Turn OFF the electricity to all heating and
cooling components. Do not turn the
electricity back on until all work is
completed.
2. Remove the cover and front portion of your old thermostat
to expose the wiring connections.
3. Write down the letters printed near each wire terminal that
is used, and the color of the wire that is connected to it.
Using the enclosed labels, attach a label to each of your
wires so that the letter matches the marking on your
existing thermostat.
4. When they are all labeled, carefully remove the wires one
at a time, making sure that they do not fall back inside the
wall. Do not allow any of the bare wire ends to touch
each other, or any parts on the thermostat.
5. Loosen all of the screws on the old thermostat and
remove it from the wall.
6. MOUNT THE NEW THERMOSTAT
1. Strip insulation leaving 3/8 in. (9.5mm) bare wire ends
and clean off any corrosion.
2. Fill wall opening with non-combustible insulation to
prevent drafts from affecting the thermostat.
CAUTION:
Be careful not to drop the unit or disturb electronic parts.
Leave the door closed while the body is being removed from
the base.
OFF

6
3. Remove the body from the thermostat’s base by pressing
the thumb latch at the bottom center of the unit and
swinging the body away from the base.
NOTE:
If you are mounting the base to 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, and insert the plastic anchors provided.
4. Hold the base against the wall. Route the wires through
the hole below the terminal block. Position the base for
best appearance (to hide any marks from an old
thermostat). Attach the base to the wall with the two
screws provided.
7. WIRING INFORMATION AND DIAGRAMS
CONNECTING THE WIRES
5. Wires must be trapped between the black
clamps and the brass terminals as shown
here.
6. Securely tighten all of the electrical terminal
screws, including any unused ones.
WIRING DIAGRAM NOTES:
(Important, please read all notes before connecting wires)
• If the information provided does not clearly represent your
system configuration, please refer to the “TECHNICAL
ASSISTANCE” section of this manual, and contact our
support department before removing any of your existing
thermostat wiring.

7
• All of the dashed wires shown in the following 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.
• The optional “C” terminal is used for powering the
thermostat by the 24 Volt system power. This can be used
alone, or in addition to installing batteries.
• If “Y” and “C” wires are both present, then “C” is most
likely a system common wire.
• For Heat Pump systems, use either the “O” terminal or the
“B” terminal, but not both. If an “O” and a “B” wire are
both present, “B” is likely a system common and may be
connected to the “C” terminal. Connecting system
common power to this thermostat’s “B” terminal may
damage the thermostat, and also your system.
• If replacing a Honeywell TM-11, tape off the “R” wire.
Connect the “B” wire to the “RH” terminal.
• If replacing an old thermostat that has a mechanical clock,
there may be two wires labeled as “C” for the clock power.
Tape off these wires and do not connect them to the “C”
terminal of this thermostat.

8
RC GRH YW2 W1A OBC
FAN HEATER SYSTEM
XFMR
TYPICAL 24-VOLT, 2 OR 3 WIRE, CONVENTIONAL,
1-STAGE, HEATING ONLY SYSTEMS (INCLUDING MILLIVOLT)
G
F
RH
R V
CW1
W
H
4
Factory RH-RC Jumper Wire Installed
O
P
T
I
O N
A
L
#1

9
RC GRH YW2 W1A OBC
3-WIRE
HYDRONIC
ZONE VALVE
SYSTEM
XFMR
TYPICAL 24-VOLT, CONVENTIONAL, 1-STAGE, HOT WATER
HEAT ONLY SYSTEMS WITH A 3-WIRE ZONE VALVE
A
6
RH
R V
3
Y
W1
W
H
4
C
Factory RH-RC Jumper Wire Installed
O
P
T
I
O N
A
L
#2

10
RC GRH YW2 W1A OBC
FAN A/C
UNIT
SYSTEM
XFMR
TYPICAL 24-VOLT, 3 WIRE, CONVENTIONAL,
1-STAGE COOLING ONLY SYSTEMS
RC
R
5
G
F
Y
C*
6
C
Factory RH-RC Jumper Wire Installed
O
P
T
I
O N
A
L
#3

11
RC GRH YW2 W1A OBC
FAN HEATER SYSTEM
XFMR
TYPICAL 24V, 4 WIRE, CONVENTIONAL HEATING AND COOLING
SYSTEMS WITH 1 STAGE HEAT AND 1 STAGE COOL
A/C
UNIT
RH
R
V
G
F
Y
C*
6
W1
W
H
4
C
Factory RH-RC Jumper Wire Installed
O
P
T
I
O N
A
L
#4

12
RC GRH YW2 W1A OBC
FAN SYSTEM
XFMR
TYPICAL 24V, 5 WIRE, CONVENTIONAL HEATING AND COOLING
SYSTEMS WITH 2 STAGE HEAT AND 1 STAGE COOL
HEAT
SECOND
STAGE
HEAT
FIRST
STAGE
A/C
UNIT
W2RH
R V
G
F
Y
C*
6
W1
W
H
4
C
Factory RH-RC Jumper Wire Installed
O
P
T
I
O N
A
L
#5

13
RC GRH YW2 W1A OBC
TYPICAL 24V, 4 WIRE, HEAT PUMP SYSTEMS
WITH 1 STAGE HEAT AND 1 STAGE COOL
FAN SYSTEM
XFMR
HEAT
PUMP
UNIT
CHANGE-
OVER
VALVE
** Use either “O” or “B”
Terminal, Never Both
RC
R
5
G
F
Y
C*
6
O B C
Factory Supplied RH-RC
Jumper Wire Installed
Customer Supplied Jumper Wire Installed
O
P
T
I
O N
A
L
#6

14
RC GRH YW2 W1A OBC
TYPICAL 24V, 5 WIRE, HEAT PUMP SYSTEMS
WITH 2 STAGE HEAT AND 1 STAGE COOL
FAN SYSTEM
XFMR
HEAT
PUMP
UNIT
CHANGE-
OVER
VALVE
** Use “O” or “B”
Terminals, Never Both
AUXILIARY
HEAT
RC
R
5
W2 G
F
Y
C*
6
C
BO
O
P
T
I
O N
A
L
#7
Factory Supplied RH-RC
Jumper Wire Installed
Customer Supplied Jumper Wire Installed

15
RC GRH YW2 W1A OBC
FAN HEATER HEAT
XFMR
TYPICAL 24V, 5 WIRE, CONVENTIONAL HEATING AND COOLING
SYSTEMS WITH 2 STAGE HEAT AND 1 STAGE COOL,
WITH TWO 24-VOLT TRANSFORMERS
A/C
UNIT
COOL
XFMR
RC
R
5
RH
R
V
G
F
Y
C*
6
W1
W
H
4
C
**Factory RH-RC Jumper Wire REMOVED
O
P
T
I
O N
A
L
#8

16
8. HARDWARE SETUP OPTIONS
NOTE:
All of the settings, options, and components listed in the
following section are located on the rear of the thermostat,
on the circuit board.
GAS/ELEC. FAN OPERATION
This is a plastic jumper cap, which is
labeled as JP2. This jumper must remain
installed, and can be in one of two
positions, GAS or ELECTRIC.
This setting changes how the system’s blower fan (if
applicable) is controlled while in HEAT mode, and with the
Fan switch in the AUTO position. This setting does not
affect fan operation while in COOL mode. When set to
“Gas”, the fan is controlled solely by the heating system
itself. When set to “Electric”, the fan is controlled directly
by the thermostat. NOTE: If your blower fan does not
operate properly after installation, move the Gas / Electric
option to the “Electric” setting.
OPTION SWITCHES:
The following option settings are all located
within a group of small switches labeled 1
through 6 as shown, and are located in the
center of the circuit board. Changes made to
any of these switches are recognized on
initial power up, or when the front panel
Temperature Mode switch position has been
altered in any direction if the thermostat is
already being powered by batteries.
ELECRIC
GAS
JP2
ON
123456

17
[1] SYSTEM MODE
This setting tells the thermostat about the type of heating
and cooling equipment that it is controlling, so that the
system is operated properly. This switch needs to be in the
OFF (NON-HP) position if you have a furnace or conventional
heating and air conditioning system. If you have a Heat
Pump system, the switch needs to be in the ON (HP)
position; this is applicable even if your heat pump system
has an auxiliary heat stage that is a gas furnace.
[2] RECOVERY
The Early Recovery feature affects how the thermostat
transitions from an energy saving setback temperature, to a
comfort temperature. Normally the change in temperature
only starts to occur at an upcoming period's start time.
With Early Recovery Disabled: If you have programmed your
thermostat for 70°F at 5:00PM, the thermostat will only
begin to heat your home back up when the time reaches
5:00PM. With Early Recovery Enabled: Using the same
scenario as above, the thermostat will calculate the best time
to turn on the heater, so that the temperature in your home
reaches 70°F as close to 5:00PM as possible. During the
time that the thermostat is performing a recovery, the words
“IN RECOVERY” will flash in the temperature portion of the
display screen. Switch position OFF is Recovery Disabled,
and ON is Recovery Enabled.
[3] DELAY
This sets the minimum length of time that Heat or Cool must
remain either On or Off, before it will automatically switch to
the alternate On or Off state. This Delay prevents rapid
cycling of your system and provides equipment protection
for cooling units. Switch position OFF is a 5 minute delay,
and ON is a 2 minute delay. 5 minutes is the default setting,
and is good for most applications. If you feel that your
system is trying to cycle more rapidly than every 5 minutes,
you may try the 2 minute setting.

18
[4] SCALE
This setting determines how the thermostat displays all
temperatures on the screen. Switch position OFF is F°, and
ON is C°.
[5] TIME
This setting determines how the thermostat displays the
clock and all other time values on the screen. Switch
position OFF is 12 HR (US Standard), and ON is 24 HR
(Military Time).
[6] BATTERY MONITOR
This determines whether the internal battery voltage monitor
watches the condition of the batteries that are installed in the
thermostat. This setting should always remain enabled
unless the thermostat is being powered by System Power
alone, without any batteries present. Switch position OFF is
Battery Monitor On (Enabled), and Switch position ON is
Battery Monitor Off (Disabled).
WARNING:
Undesired operation may result if the battery monitor is set
to “Disabled” while this thermostat has batteries installed.
9. COMPLETING THE INSTALLATION
Once all hardware option settings are performed, install two
new Energizer®or DURACELL®"AA" size alkaline batteries
before continuing further. Ensure that the batteries are
installed in the proper direction as per the markings shown
in the battery tray. If batteries were already installed before
setting changes were performed, simply change the
Temperature Mode switch on the front panel to any other
position so that the new settings may be recognized by the
thermostat.

19
NOTE:
When you are finished performing your installation and setup
options, please remove the thin plastic film that is protecting
the LCD display screen on the front of the thermostat. This
plastic may or may not be present, and is evident by the
appearance of fake digits appearing on the display screen.
10. FRONT PANEL ITEMS
RESET
The RESET button is a small recessed push button that is
located right above the NEXT button behind the front door.
This button can be pushed with a pencil or the end of a
paper clip. This reset returns the heating and cooling
programs to their default Energy Star values, resets the filter
counter, and all other user changeable software options to
their default values. It is recommended that you write down
your current heating and cooling program start times and
temperatures prior to pressing the software reset button.
MODE SWITCHES
There are two mode switches on the front, a TEMPERATURE
Mode switch and a FAN Mode switch.
The TEMPERATURE Mode switch has three positions: HEAT,
OFF, and COOL. In the winter, set the switch to HEAT to
control your heating system. In the summer, set the switch
to COOL to control your cooling system. In the spring and
fall or when the windows are open, you can set the switch to
OFF to prevent heating or cooling operation.
The FAN Mode switch has two positions, AUTO and ON.
Setting the Fan switch to AUTO automatically runs your
system's blower fan as required, only during heating or
cooling activation. Setting the Fan switch to ON, runs your
system’s fan continuously, even if heating or cooling is not

20
needed. With the Fan switch in the ON position, the fan will
operate even when the Temperature Mode switch is in the
OFF position to provide air circulation only. When the fan is
running, the word “FAN” is displayed in the temperature
portion of the display screen.
NOTE:
The Fan Mode switch only works if your system provides a
wire for the thermostat’s “G” wire terminal, to control a
blower fan. The Fan Mode switch has no effect in systems
that do not have a blower fan (such as a hot water radiator
system).
PUSH BUTTONS
There are five primary push buttons on the front of the
thermostat: The UP and DOWN arrow keys, the NEXT button,
The HOLD button, and the COPY/EMER button.
ROTARY DIAL
The LUX Speed Dial®provides an easy way to quickly
navigate between the different programming areas. This
rotary dial has five individual positions and should always
remain in the RUN position, unless a specific action is being
performed in one of the other positions.
11. OPERATING INSTRUCTIONS
SET DAY/TIME
Rotate the dial to the SET DAY/TIME position. You should
see the word SET appear in the upper left corner of the
display, along with the clock and a day of the week that is
flashing. With the day flashing, press either the UP or
DOWN buttons to make the current day flashing. Press the
NEXT button; this should cause the time to start flashing and
the day to remain on steady. Using either the UP or DOWN