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