Lux Products Tx1500Uc Instruction Manual TX500Ua_ENG_Manual

2015-05-12

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TX1500Uc
SMART TEMP ® UNIVERSAL 5/1/1-DAY
PROGRAMMABLE OR NON-PROGRAMMABLE THERMOSTAT
(FOR BOTH CONVENTIONAL AND HEAT PUMP SYSTEMS)

I N S TA L L AT I O N A N D O P E R AT I N G I N S T R U C T I O N S
52173

IMPORTANT!
• Please read all of these instructions carefully before beginning
installation.
• Label every wire terminal designation on your existing thermostat wiring
before removing your old thermostat.
• Ignore the color of the wires since they may not comply with any
standard. Please connect wires using the terminal letter designations.
Thank you for your confidence in our product. To obtain the best results from
your investment, please read and 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 possibly your heating and cooling system. These
instructions may contain information beyond that which may be required for your
particular installation.
CAUTIONS AND WARNINGS . . . . . . . . . . 2
SYSTEM COMPATIBILITY . . . . . . . . . . . . 3
FEATURES . . . . . . . . . . . . . . . . . . . . . . . 4
TOOLS YOU MAY NEED . . . . . . . . . . . . . . 4
MOUNTING LOCATION . . . . . . . . . . . . . . 5
REMOVE OLD THERMOSTAT . . . . . . . . . . 5
INSTALL THERMOSTAT BASE . . . . . . . . . 6
WIRING INFORMATION . . . . . . . . . . . . . . 7
WIRING DIAGRAMS . . . . . . . . . . . . . . . . 9
COMPLETE THE INSTALL . . . . . . . . . . . 18

FRONT PANEL ITEMS . . . . . . . .
SYSTEM CONFIGURATION AND
SETUP OPTIONS. . . . . . . . . . . .
OPERATING INSTRUCTIONS . . .
TEMPERATURE PROGRAMS . . .
ADVANCED FEATURES . . . . . . .
BATTERY REPLACEMENT . . . . .
TECHNICAL ASSISTANCE . . . . .
LIMITED WARRANTY . . . . . . . .
MERCURY NOTICE . . . . . . . . . .

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 Procter & Gamble Company

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CAUTIONS AND WARNINGS:
• This 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, or whenever you see the LO BATT indication on the screen.
Failure to follow these battery instructions could result in property damage
and/or personal injury.
• The electrical rating for this thermostat is 1.5 Amps per terminal, with a
maximum total load of 3.0A for all terminals combined.
• The thermostat contains parts that 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.
• 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.
• 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.
• 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.
• Persons with physical or mental limitations may not be able to promptly
respond to a malfunction of the heating/air-conditioning system.
• 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. You
should consult a qualified HVAC technician or an electrician if you do not fully
understand the installation instructions.

T X1 500U c
Fan Mode
Switch

LCD Display Screen

FAN
AUTO
ON

TU
DAY

SET

FAN

Set Slide
Switch

RUN

HEAT

DAY/TIME
TEMP PROG

FILTER
%LEFT

TEMPERATURE

AIR FILTER

SET

HEAT
OFF

SETBACK

HOLD

EMER

COOL

System Mode
Switch

UP / DOWN Buttons

SYSTEM COMPATIBILITY:
The electrical rating for this thermostat is 1.5 Amps per terminal, with a
maximum total combined load of 3.0A 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.

FEATURES:
•
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•
•
•
•
•
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•
•
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•
•
•
•

1 or 2-Heat / 1-Cool, 5/1/1-day programming
Universal Compatibility for all system types
Weekdays, Saturday, and Sunday can be programmed separately
Exclusive LUX ® Speed Slide T M for easy programming
User-selectable periods per day (2 or 4)
User-selectable programmable or non-programmable operation
LuxLight ® EL (Electro-Luminescent) lighted display
Programmable air filter life timer
Graphical filter monitor
Keypad lockout for unauthorized users
Manual temperature hold
Adjustable vacation hold (1 to 30 days)
Temporary temperature override
Adjustable temperature differential / cycle-rate
Adjustable 2nd heat stage Offset setting
User temperature calibration
Adjustable heat/cool set temperature limit stops
Smart recovery
Dual-powered (battery and/or 24-volt system powered)
Battery-free memory storage
F/C temperature display
12/24-hour clock display
5/2-minute selectable time delay for equipment protection

TOOLS YOU MAY NEED:
•
•
•
•

Screwdrivers
Wire Stripper
Wire Cutter
Drill with assorted drill bits (new installations only)

MOUNTING LOCATION:
On replacement installations, mount the new thermostat in place of the old one
unless the conditions listed below suggest otherwise. On new installations,
please follow these general guidelines:
1. Mount the thermostat on an inside wall, about 5 ft. (1.5m) above the floor.
2. Do not locate the thermostat where air circulation is poor such as in a corner,
alcove, or behind a door that is normally left open.
3. Do not locate the thermostat where unusual heating or cooling conditions may
be present, such as: direct sunlight, above a lamp, television, or radiator, or on
a wall next to an exterior door or window.
4. Do not locate in a damp environment, as this can lead to corrosion that may
shorten thermostat life.
5. If painting or construction work is still ongoing, cover the thermostat
completely or wait until this work is complete before installation.

WARNING:
All wiring must conform to the local codes and ordinances that are in your
particular location.

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 front portion of your old thermostat to
expose the wiring connections.
OFF
3. Write down the letters printed near each wire terminal
that is used, and also the color of each wire that is
connected to it. Self-adhesive wire labels are also
enclosed.
4. Carefully remove the wires one at a time, and bend them in a manner so that
they do not fall back inside the wall. Do not allow bare wire ends to touch
each other.
5. Loosen the mounting screws for the old thermostat and carefully remove it
from the wall.

INSTALL THERMOSTAT BASE:

THERMOSTAT TOP VIEW
1. Strip wire insulation leaving only 3/8 in. (9.5mm) bare wire ends, and clean off
any corrosion present.
2. Fill the wall opening with non-combustible insulation to prevent drafts from
affecting the thermostat’s normal operation.
3. Separate new thermostat housing using your thumb and index finger. Provide
pressure in opposite directions to the release tabs on the top of the housing,
in the directions shown in the diagram shown above.
4. Route the wires through the opening in the new thermostat base plate, and
hold the base against the wall. Try to line up the screw holes from the prior
thermostat, and install the mounting screws.
5. If the previous holes cannot be used, hold the thermostat base against the
wall so that it appears straight and level (position the base for best
appearance) and mark for the new screw holes. Attach the base to the wall
using the screws provided (use the supplied plastic anchors if needed when
mounting to a soft material such as drywall).

WIRING INFORMATION:
CONNECTING THE WIRES:
When attaching the wires to the thermostat, please ensure that the bare wire
ends are held ALL the way into the terminal block while the screw is being
tightened.
WIRING BASE PLATE NOTICE:
This thermostat model is part of a family of similar models that have the same
general visual appearance. Even though this base plate may look the same as
base plates from other models, the wiring connections may have different
terminal letters for different purposes. Please do not interchange the back plates
and/or thermostat front halves of other similar looking models. Doing so may
cause undesired heating and/or cooling operation to occur.

WIRING DIAGRAM NOTES:
(Important, please read all notes before connecting wires)
• If the information provided in the following wiring diagrams does not clearly
represent or match your system, please refer to the “TECHNICAL ASSISTANCE”
section of this manual, and contact us before removing any of your existing
thermostat wiring.
• 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.
• Terminal letters shown in black represent typical wiring applications.
Depending upon the brand of your specific system or thermostat, your terminal
letters may not match exactly. Terminal letters shown in gray represent other
possible wiring designations that you might see on your existing thermostat
terminals.
• 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.
• If your old thermostat has both a “Y” and “C” wire both present, then “C” is
most likely a System Common wire.
• 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.
• 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.
• 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

WIRING DIAGRAMS:

DIAGRAM

SYSTEM TYPE / DESCRIPTION

CONVENTIONAL:

HEATING ..........................................................10
1-STAGE OR 2-STAGE
2, 3, 4, 5 WIRES

CONVENTIONAL:

HEATING ..........................................................11
3-WIRE ZONE VALVE
3, 4 WIRES

CONVENTIONAL:

COOLING ..........................................................12
1-STAGE
3, 4 WIRES

CONVENTIONAL:

HEATING AND COOLING .....................................13
1-STAGE HEAT
4, 5 WIRES

CONVENTIONAL:

HEATING AND COOLING .....................................14
2-STAGE HEAT
5, 6 WIRES

CONVENTIONAL:

HEATING AND COOLING .....................................15
TWO-TRANSFORMERS
5, 6 WIRES

HEAT PUMP:

HEATING AND COOLING .....................................16
SINGLE-STAGE ONLY
4, 5 WIRES

HEAT PUMP:

HEATING AND COOLING .....................................17
WITH AUX / EMERGENCY HEAT
5, 6 WIRES
9

PAGE #

FAN WIRE
MAY NOT BE
PRESENT IN
ALL SYSTEMS

SYSTEM 24V
TRANSFORMER

F
V

SYSTEM COMMON

Factory RH-RC Jumper Wire Installed

STAGE
2

HEATER

STAGE
1

1-STAGE OR 2-STAGE, HEATING ONLY
(INCLUDING MILLIVOLT) (2-WIRE HEAT USE “RH” & “W1”)

O
P
T
I
O
N
A
L

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC

FAN

2, 3, 4, 5 WIRES

3-WIRE ZONE VALVE

OPEN

RH
V

SYSTEM COMMON

SYSTEM 24V
TRANSFORMER

Factory RH-RC Jumper Wire Installed

HOT WATER HEATING ONLY
(WITH A 3-WIRE ZONE VALVE)

OPEN = Heat On
CLOSE = Heat Off

O
P
T
I
O
N
A
L

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC

3, 4 WIRES

F
6

FAN

SYSTEM COMMON

SYSTEM 24V
TRANSFORMER

Factory RH-RC Jumper Wire Installed

1-STAGE, COOLING ONLY

AIR
CONDITIONER

O
P
T
I
O
N
A
L

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC

3, 4 WIRES

SYSTEM 24V
TRANSFORMER

O
P
T
I
O
N
A
L

HEATER

SYSTEM COMMON

AIR
CONDITIONER

Factory RH-RC Jumper Wire Installed

CONVENTIONAL (NON HEAT PUMP)
1-STAGE HEATING AND 1-STAGE COOLING

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC

FAN

4, 5 WIRES

SYSTEM 24V
TRANSFORMER

HEATER

STAGE
2

O
P
T
I
O
N
A
L

STAGE
1

SYSTEM COMMON

AIR
CONDITIONER

Factory RH-RC Jumper Wire Installed

CONVENTIONAL (NON HEAT PUMP)
2-STAGE HEATING AND 1-STAGE COOLING

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC

FAN

5, 6 WIRES

COOL 24V
TRANSFORMER

HEATER

HEAT 24V
TRANSFORMER

SYSTEM COMMON

AIR
CONDITIONER

Factory RH-RC Jumper Wire REMOVED

CONVENTIONAL (NON HEAT PUMP) 1-STAGE HEATING AND
1-STAGE COOLING WITH TWO SEPARATE 24V TRANSFORMERS

O
P
T
I
O
N
A
L

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC

FAN

5, 6 WIRES

F
6

FAN

HEAT PUMP

CUSTOMER INSTALLED Y-W1 Jumper Wire

SYSTEM COMMON

SYSTEM 24V
TRANSFORMER

Factory RH-RC Jumper Wire Installed

SINGLE-STAGE HEAT PUMP SYSTEM
WITH NO AUX OR EMERGENCY HEAT

O
P
T
I
O
N
A
L

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC

REVERSING
VALVE

** Use “O” or “B”
Terminals, Never Both

4, 5 WIRES

FAN

HEAT PUMP

AUX / EMERG.
HEAT

W3
W

CUSTOMER INSTALLED Y-W1 Jumper Wire

SYSTEM COMMON

SYSTEM 24V
TRANSFORMER

Factory RH-RC Jumper Wire Installed

2-HEAT / 1-COOL, HEAT PUMP SYSTEM
WITH AUX AND EMERGENCY HEAT

O
P
T
I
O
N
A
L

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC

REVERSING
VALVE

** Use “O” or “B”
Terminals, Never Both

5, 6 WIRES

COMPLETE THE INSTALL:
INSTALL BATTERIES INTO THERMOSTAT: Install two brand new Energizer ® or
DURACELL ® “AA” size alkaline (only) batteries, into the thermostat’s battery
compartment. Ensure the batteries are installed in the proper direction.
GAS / ELEC CIRCUIT BOARD OPTION (“G” TERMINAL FAN OPERATION): This
setting is a plastic shorting cap called a jumper. This jumper must remain
installed, and set to either GAS or ELECTRIC for your system to work properly.
This setting changes how your system’s blower fan (if applicable) is controlled
while the thermostat is in HEAT or EMERG HEAT mode, when the Fan switch in
the AUTO position. This setting does not affect the fan operation while in COOL
mode.
When set to “GAS”, the blower fan is controlled solely by the heating system
itself. Systems that would typically use the “GAS” setting would be: natural gas,
propane, or oil furnaces, and boilers.
NOTE: If your blower fan does not operate
properly after installation, move the Gas /
BATTERY
Electric option to the “Electric” setting.
When set to “ELEC”, the blower fan is
controlled directly by the thermostat. This
setting is required for heating systems
that do not control their own fan, such as
HEAT PUMPS, and units that only have an
electric-resistive heating element as the
heat source.

ELEC

GAS

FRONT PANEL ITEMS:
These items below are all located behind the door on the front of the thermostat.
To open the door, pull outwards using the small indentation in the center of the
top edge of the thermostat housing.
HEAT / OFF / COOL, SYSTEM MODE SWITCH: Set this switch to HEAT to control
your heating system, and COOL to control your cooling system. The OFF position
will disable both the heating and cooling units.
AUTO / ON, FAN MODE SWITCH: When this switch is in AUTO, the blower fan (if
present in your system) will automatically cycle on and off by itself while heating
or cooling is running. When in the ON position, the blower fan will run constantly
18

with or without a demand for heating or cooling, even when the System Mode
switch is in the OFF position.
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).
MULTI-FUNCTION, SET SLIDE SWITCH: This switch provides an easy way to
quickly access the most commonly used thermostat settings. This switch has 4
individual positions, and unless a specific setting is being adjusted, this switch
should always remain in the RUN position for the thermostat to control the room
temperature. The other Set Slide switch positions are described in greater detail
in the ADVANCED FEATURES section. NOTE: this switch is only operable when the
thermostat is in “Programmable” mode. When the thermostat is used in
“Manual” control mode, all 4 of the switch positions will act like the RUN
position, except the “AIR FILTER” position.
SETBACK BUTTON: This button activates and deactivates the SETBACK feature,
which overrides the set temperature for an adjustable duration. This feature is
described in greater detail in the ADVANCED FEATURES section.
UP / DOWN BUTTONS: The UP and DOWN buttons are used to adjust any item
that can be changed by the user. Examples are the set temperatures, clock
times, and days of the week. In many cases, an item may be flashing if it can
currently be adjusted.
HOLD BUTTON: This button activates and deactivates the manual Temperature
Hold feature.
EMER BUTTON: When in Normal Run mode, the usage of this button varies
depending upon your specific system configuration. For heat pump systems,
pressing this button enables your emergency heat function, which is described in
greater detail in the OPERATING INSTRUCTIONS section. For conventional
systems, there is no such thing as emergency heat, so this button will have no
effect.
NEXT BUTTON: This button is mostly used while setting items such as software
options, and temperature program periods. When there are several items on the
screen that can be changed, usually one of them is flashing indicating that it can
be adjusted. Pressing the NEXT button will cycle through which item is flashing.

SYSTEM CONFIGURATION AND SETUP OPTIONS:
Setup options for how the thermostat will function, along with choosing your
particular system type, are performed using a menu on the display screen.
TO ACCESS THE SETUP MENU: Move the System Mode switch into the OFF
position, and then hold down the EMER button for approximately 5 seconds until
the screen changes. The menu will always start with item #1, and is advanced to
each following item by a single press of the NEXT button. The options for each
item are changed using the UP or DOWN buttons.
ITEM #01 (CLK = CLOCK FORMAT): [12Hr, default] This displays the clock times
using standard AM and PM values. [24Hr] This displays the clock times using the
military-time format (example 22:00 hours, without using AM or PM).
ITEM #02 (TMP = TEMPERATURE SCALE): [F, default] Shows all temperature
values in Fahrenheit. [C] Shows all temperature values Celsius.
ITEM #03 (THERMOSTAT TYPE): [PROG, default] Use this setting for following a
daily program routine. [MAN] This setting omits the program routine and
operates as a manual style non-programmable thermostat. This is very basic and
only shows the room temperature and set temperature on the screen, with no
clock.
ITEM #04 (PERD = PERIOD QUANTITY): [4P, default] Thermostat uses four
periods per day (called MORN, DAY, EVE, and NITE). [2P] The thermostat uses two
periods per day (called DAY and NITE).
ITEM #05 (RCV = EARLY RECOVERY): [OFF, default] Program Set Temperature
values start to occur at exactly the period start times. [ON] Early Recovery
affects how the transition occurs when changing from the NITE to the MORN
period, and when changing from the DAY to the EVE period. The thermostat
calculates how long it takes for your home to recover from a setback on a daily
basis, and turns on ahead of time in order to reach the target set point of the
next upcoming program period by the period’s start time. While in a recovery,
the word “RECOV.” will be shown on the display screen.
ITEM #06 (SYSTEM MODE): [FURN, default] This is for the majority of heating
systems that are not Heat Pumps, such as a gas furnace or hot water boiler. [HP]
Use this setting if you have a Heat Pump system, which uses the outdoor unit as
the primary heat source and may also contain an electric heating element as a
backup heat source. When set to “HP”, ensure that you have also set the
Gas/Electric circuit board option to “ELEC”, as described in the “COMPLETE THE
INSTALL” section.
20

ITEM #07 (DLAY = DELAY TIME): [5, default] Thermostat waits 5 minutes before
turning the system back on after it was last run. This internal delay prevents
rapid cycling and provides equipment protection. The 5 minute setting is fine for
most applications. [2] Same operation as above but reduced to 2 minutes
between state changes.
ITEM #08 (TEMPERATURE SWING): A thermostat works by turning your heating
or cooling system on and off whenever the room temperature varies from the
desired set-point temperature. The amount of this variation is called the swing.
Use the UP/DOWN buttons to change the number value between 1 and 9.
Generally your system should cycle on about 3 to 6 times per hour. A smaller
swing number makes the system cycle more frequently, so the room temperature
is more precise and constant. A larger swing number will make the system
remain on for a longer duration each time and decreases the number of cycles
per hour.
ITEM #09 (STAGE-2 OFFSET): [2, default] This setting is adjusted as a number
from 0 to 9. When set to 0 (ZERO), the second heating stage is completely
disabled while in regular Heat mode (however Emergency Heat mode will still
function for heat pump configurations). An Offset value from 1 to 9 degrees will
determine the number of degrees from the set point that will be required for the
second heating stage to turn on. This setting can be used to conserve energy in
situations where the second heating stage is more costly to operate when
compared to the first stage.

71
70
69
68

Cut-In / Cut-Out
(1st Stage)

70˚F Set
Temperature

Swing
Setting=
#2 (+/- 0.5˚F)

Offset **
Setting=
4˚F degrees

67
66
(2nd Stage) **
Cut-In / Cut-Out

65
DEGREES (F)

** = Only applies if a second
heat stage is present

OPERATING INSTRUCTIONS:
SET DAY AND TIME: Place the Set Slide Switch into the DAY/TIME position. With
the day flashing, press UP or DOWN to set the day of the week. Press NEXT and
the clock time will start flashing. Use UP or DOWN to set the time, making sure
the AM/PM indication is correct. Holding the UP or DOWN buttons will make the
clock digits scroll rapidly. Return the Set Slide switch to the RUN position when
finished.
HEATING AND COOLING: Basic operation of your heating or cooling system can
be obtained with the Set Slide Switch in the RUN position and choosing either
HEAT or COOL on the System Mode switch. The temperature can be adjusted
using the UP and DOWN buttons. When the thermostat is first powered up, it will
follow a default temperature routine that is preset from the factory (shown
below).

PERIOD
MORN
DAY
EVE
NITE

HEAT MODE
6:00 AM 70 °F (21 °C)
8:00 AM 62 °F (17 °C)
6:00 PM 70 °F (21 °C)
10:00 PM 62 °F (17 °C)

COOL MODE
6:00 AM 78 °F (26 °C)
8:00 AM 82 °F (28 °C)
6:00 PM 78 °F (26 °C)
10:00 PM 75 °F (24 °C)

EMERGENCY HEAT: (Heat Pump Configuration Only). While in normal Heat mode
with the Set Slide switch in the RUN position, one single press of the EMER
button will activate Emergency Heat mode. A single press again will end
Emergency Heat mode, and return back to normal Heat mode. While in
Emergency Heat mode, the word “EMER” will also be shown in the middle portion
of the display screen. If a power loss occurs while in Emergency Heat mode, the
thermostat will continue to remain in Emergency Heat mode even after the power
comes back on.
Emergency Heat mode will prevent the first stage of your heat pump system from
turning on, and use only the “W2” heat terminal (Auxiliary Heat) as the primary
heating source. This will not only prevent the heat pump from wasting energy if
outdoor temperatures are too low to support efficient operation, but it could also
prevent damage to the heat pump if outside temperatures are below the
manufacturer’s recommendations. As every heat pump has different operating
23

characteristics, you should refer to your heat pump literature to determine when
to disable the heat pump and run in Emergency Heat mode. In general for most
heat pump systems, use Emergency Heat mode whenever the outside
temperature is less than 32°F (0°C) degrees.
LCD DISPLAY BACKLIGHT: The display screen is lighted to assist viewing at
nighttime, or in locations with low light levels. A press of any button on the front
panel will light the display for approximately 10 seconds. Any button presses
that occur while the light is on will reset the 10-second timer, causing the screen
to remain illuminated for an additional 10 seconds.
TEMPERATURE OVERRIDE: While in Program RUN mode, the set temperature can
be temporarily changed by pressing UP or DOWN. The set temperature will return
to the programmed value stored in memory when the start time of the next
upcoming program period is reached (Morn, Day, Eve, Nite). While a Temporary
Override is in effect, the word “OVERRIDE” will be shown in the display screen.
An Override may be cancelled moving the mode switch to OFF, then back to HEAT
or COOL.
TEMPERATURE HOLD: A Temperature Hold is used for maintaining a fixed set
temperature. Once a Hold is initiated, the thermostat will maintain the set
temperature indefinitely. A Hold may be used for days, weeks, or even months at
a time, as long as the thermostat has adequate power. To enter Hold mode:
press the HOLD button one time and the word “HOLD” will appear in the display.
To cancel a Hold, press the HOLD button one more time. If a complete power
failure occurs during a Temperature Hold, the thermostat will continue to remain
in Hold mode even after the power comes back on. NOTE: If you plan to leave
the thermostat in Hold mode for an extended duration (unattended), it is
advisable to install new Energizer ® or DURACELL ® "AA" size alkaline batteries
prior to leaving to ensure reliable operation of your heating and cooling system.

STATIC NOTICE: This thermostat is protected against normal static electric
discharges, however to minimize the risk of damaging the unit in extremely dry
weather, please touch a grounded metal object before touching your thermostat.

TEMPERATURE PROGRAMS:
By default, this thermostat has 4 separate program periods for both Heat and
Cool mode, they are: MORN, DAY, EVE, and NITE. Each period ends at the start
time of the following period. The heat programs are set in HEAT mode, and the
cool programs are set in COOL mode.
NOTE: If the thermostat is configured to use only 2 periods per day instead of 4
(SYSTEM CONFIGURATION AND SETUP OPTIONS), the thermostat will only use the
DAY and NITE periods. The MORN and EVE periods will not be visible on the
screen.

SET TEMPERATURE PROGRAMS: Move the Set Slide switch to the TEMP PROG
position. Programming will start with all 5 weekdays, Monday through Friday (all
grouped together). Use the UP/DOWN buttons to adjust the start time for the
MORN period, then press the NEXT button to advance. Use the UP/DOWN buttons
to adjust the set temperature for the MORN period, then press the NEXT button to
advance. Now adjust the start time and set temperature for the DAY period,
pressing the NEXT button after each to advance. Continue with these same steps
to adjust the start times and set temperatures for the EVE and NITE program
periods.
When the NITE period is finished for the weekdays, the thermostat will advance
forward to the Saturday program, with the MORN period start time flashing.
Perform the same steps that you used for setting the weekday periods, pressing
the NEXT button to advance through each flashing value.
When the Saturday NITE period is finished, the thermostat will advance forward
to the Sunday program, with the MORN period start time flashing. Perform the
same steps that you used for setting the Saturday periods, pressing the NEXT
button to advance through each flashing value. Return the Set Slide switch to
the RUN position when you are finished.

ADVANCED FEATURES:
TEMPERATURE CALIBRATION: The internal temperature sensor in this thermostat
is accurately calibrated at the factory, and in most cases alterations to this
setting should not be needed. The Temperature Calibration feature allows you to
manually offset the measured temperature by as much as plus or minus 5°F
(3°C) degrees from its original value. This feature can be useful to match or
synchronize this thermostat to another one or more, if multiple thermostats are
used in the same home.
NOTE: The Temperature Calibration setting need to be performed in a timely
manner, as the thermostat will timeout and automatically exit the adjustment
screen after approximately 10 seconds without a button press.
TO CHANGE THE TEMPERATURE CALIBRATION: Ensure that the System Mode
switch is in the OFF position and the Set Slide switch is in the RUN position.
Press and hold both the UP and DOWN buttons together for at least 5 seconds.
The words “SET” and “CAL” will appear on the screen, along with a single
flashing temperature digit. Use the UP/DOWN buttons to change the number of
degrees of adjustment. 0° degrees is the default value, and means no correction
is being applied. Press the NEXT button to accept the setting.

SETBACK FEATURE: The setback feature is similar to both a Temperature
Override and a Temperature Hold, in that both are used to maintain a fixed set
temperature instead of following a programmed daily routine. A Setback can be
considered the same as a Temperature Override, which can last for a longer
duration that you can adjust from 1-12 hours, or 1-30 days. By default, when a
Setback is activated in Heat mode, the set temperature used will be 5F (3C)
degrees lower than the current set temp. For Cool mode, the set temperature
used will be 5F (3C) degrees higher than the current set temp.
TO START A SETBACK: Ensure that the System Mode switch is in either the Heat
or Cool position, and that the Set Slider is in the RUN position. Press and hold
the SETBACK button for at least 2 seconds. The screen will change and show the
words “HOURS LEFT” and “OVERRIDE”, along with two digits. Use the UP/DOWN
buttons to set the duration for how long you would like to maintain a fixed set
temperature (from 1 to 12 hours). If you would like to set the duration for longer
than 12 hours, keep pressing the UP button. The display will change from
“HOURS LEFT” to “DAYS LEFT”, with an available duration of 1 to 30 days. Once
your desired Setback duration is shown on the screen, you can either wait for the
26

screen to advance forward on its own, or press the NEXT button (behind the door)
one time to jump ahead rapidly. Now use the UP/DOWN buttons to select your
desired set temperature that will be used for the Setback duration. Just like the
previous step, you can either wait for the screen to advance on its own, or press
the NEXT button to advance and return to the Normal Run screen.
TO CANCEL A SETBACK: While in the Normal Run screen, press and hold the
SETBACK button for at least 2 seconds. The word “OVERRIDE” will disappear
from the screen and the Setback will be cancelled. Moving the System Mode
switch or Set Slide switch, will also cancel a Setback.

TEMPERATURE LIMIT STOPS: There are two independent set temperature limit
stops: a maximum heat set temperature, and a minimum cool set temperature.
These stops do not prevent a user from performing normal actions like
Temperature Override or Hold. The Heat Limit Stop prevents the set temperature
from being adjusted higher than the heat limit setting. The Cool Limit Stop
prevents the set temperature from being adjusted lower than the cool limit
setting. Each of these temperature stops is user adjustable in one-degree
increments, and these settings are protected by a selectable 2-digit code to
prevent unauthorized tampering. By default, this 2-digit code is “00”, and the
temperature stops can be used as-is with this code.
NOTE: The Temperature Limit Stop settings need to be performed in a timely
manner, as the thermostat will timeout and automatically exit the setting screens
after approximately 10 seconds without a button press.
TO SET THE HEAT LIMIT STOP: Place the System Mode switch in the OFF position,
and the Set Slide switch in the RUN position. Press and hold the UP button while
sliding the System Mode switch from OFF to HEAT. The words “STOP” and “LOCK
CODE” will appear on the screen, along with two digits. Use the UP/DOWN
buttons to select the proper code to access the heat limit setting. Press the
NEXT button to accept the setting. If the code you tried was not correct, the
thermostat will exit and return to the Normal Run screen with no changes made.
If the entered code is correct, the screen will add the word “SET” and display the
current heat set temperature limit. Use the UP/DOWN buttons to adjust the
maximum heat set temperature value. Press the NEXT button to accept the
setting and return to the Normal Run screen in heat mode.

TO SET THE COOL LIMIT STOP: Place the System Mode switch in the OFF position,
and the Set Slide switch in the RUN position. Press and hold the DOWN button
while sliding the System Mode switch from OFF to COOL. The words “STOP” and
“LOCK CODE” will appear on the screen, along with two digits. Use the UP/DOWN
buttons to select the proper code to access the cool limit setting. Press the
NEXT button to accept the setting. If the code you tried was not correct, the
thermostat will exit and return to the Normal Run screen with no changes made.
If the entered code is correct, the screen will add the word “SET” and display the
current cool set temperature limit. Use the UP/DOWN buttons to adjust the
minimum cool set temperature value. Press the NEXT button to accept the
setting and return to the Normal Run screen in cool mode.
TO CHANGE THE TEMPERATURE STOP LOCK CODE: Place the System Mode switch
in the OFF position, and the Set Slide switch in the RUN position. Press and hold
the NEXT button for at least 5 seconds. The words “STOP” and “LOCK CODE” will
appear on the screen, along with two digits. Use the UP/DOWN buttons to enter
the current code (“00” by default) and press the NEXT button one time. The word
“SET” will now be displayed. Use the UP/DOWN buttons to choose a new 2-digit
code between “00” and “99”. Press the NEXT button to accept the setting. The
screen will flash briefly to confirm the code change, and return to the Normal
Run screen in Off mode.
IF YOU FORGET YOUR TEMPERATURE STOP CODE: The code can be reset to the
factory default “00” by performing the following steps. Place the System Mode
switch in the OFF position, and the Set Slide switch in the RUN position. Press
and hold the NEXT and HOLD buttons together for at least 10 seconds. The
screen will start flashing, and display words “SET”, “STOP” and “LOCK CODE”,
along with the new code of “00”. After a couple seconds, the screen will
automatically return to the Normal Run screen in Off mode.

KEYPAD LOCKOUT: You can lock the front panel buttons to prevent unauthorized
tampering of your thermostat settings.
NOTE: These keypad lock instructions need to be performed in a timely manner.
The 4-button sequence which locks the thermostat must be entered within a 10second timeframe, or the keypad lockout sequence will have to be entered again
from the beginning.
TO LOCK THE KEYPAD: Start with the System Mode switch in either the HEAT or
COOL positions, and the Set Slide switch in the RUN position. Perform a single
press of each button, in the following sequence: NEXT, NEXT, NEXT, HOLD.
28

TO UNLOCK THE KEYPAD: Start with the System Mode switch in either the HEAT
or COOL positions, and the Set Slide switch in the RUN position. Perform a single
press of each button, in the following sequence: NEXT, NEXT, NEXT, HOLD. The
padlock should no longer be present, with the thermostat now unlocked. If the
padlock is still on the screen, please try to enter the 4-button sequence again.

GRAPHICAL AIR FILTER MONITOR: In most systems that use a blower fan and air
ducts, there is an air filter that is either replaceable or requires cleaning. The
filter is usually located in the air handler, where the blower fan is. This
thermostat feature assists you with keeping track of proper maintenance and/or
periodic replacement intervals for your system’s filter.
The Graphical Filter Monitor displays a visual bar graph in the center of the
screen, which shows the amount of air filter life remaining (in % percent), since
the last time the air filter timer has been reset. Each dot in the filter bar graph
equals 10 percent (example: 4 dots shown means 40 percent filter life
remaining). This feature is for information purposes only, and does not affect the
operation of your heating or cooling equipment, or the thermostat. When the
filter usage duration has completly expired, the vertical filter bar graph will be
empty, and the word “FILTER” will flash on the screen.
TO SET THE AIR FILTER DURATION: Move the Set Slide switch to the “AIR FILTER”
position. The words “SET DAYS” will be shown on the screen, along with the
word “FILTER” and 2-3 characters at the top right corner of the display. Press
either of the UP/DOWN buttons to select the desired filter duration (in days) from
the following choices: OFF, 30, 60, 90, 120, 180, or 365. If the filter duration
value is set to “OFF”, then the Air Filter Monitor will be completely disabled.
Return the Set Slide switch to the RUN position when you are finished.
TO RESET THE FILTER USAGE COUNTER: Move the Set Slide switch to the “AIR
FILTER” position. The three small digits at the bottom of the screen tell you the
quantity of filter days remaining. Pressing the NEXT button will toggle the
display between showing the days remaining as a number, or a graphical
precentage remaining using the vertical bar graph. Press both the UP and DOWN
buttons together at the same time, and the usage counter will return to the
beginning of the value that it originally started counting from. Refer to the
previous paragraph, should you wish to change the starting value for the filter
monitor. Return the Set Slide switch to the RUN position when you are finished.

HARDWARE RESET: The Hardware Reset button (labeled “HW
RST”) is a small round push button that is located in the
HW RST
middle of the circuit board, just below the battery holder.
Pressing this button will cause the LCD display screen to
become fully populated, the heating and cooling load relays to
cycle off, and will perform an internal system check of the
thermostat components. If your thermostat appears to be acting in an erratic
manner, pressing the Hardware Reset button may remedy this behavior. The
temperature programs are not erased when a hardware reset is performed,
however the clock will have to be changed to match the current day and time.

SOFTWARE RESET: A Software Reset is used to erase ALL heating and cooling
temperature programs, and to return all user-adjustable software settings back
to their original factory default values. To perform a Software Reset, first ensure
that the thermostat’s Keypad Lockout is not enabled and then move the System
Mode switch to the OFF position. Press and hold the UP, DOWN, and NEXT
buttons all together for at least 5 seconds. The LCD display screen will become
fully populated (let go of buttons at this point), and then return to normal. The
clock will have to be changed to match the current day and time.

COMPRESSOR PROTECTION BYPASS: This optional feature permits the installer
or service technician to temporarily disable the built in compressor protection
delays. This is most useful for diagnosing and testing the heating and cooling
systems after installation is complete, and should not be used during normal
operation. To activate this feature, press and hold both the NEXT and HOLD
buttons, while also perform a single press of the Hardware Reset button (the LCD
display screen will become fully populated). Continue to hold the NEXT and
HOLD buttons until the LCD display screen returns to normal. All compressor
protection delays (in all modes of operation) will be disabled for 5 minutes. After
the 5-minute duration has expired, the thermostat will return to normal operation
automatically.

BATTERY REPLACEMENT:
This thermostat is powered by two “AA” Alkaline batteries. The batteries should
be replaced AT LEAST once per year to ensure reliable operation (or sooner if
“LO BATT” appears in the display screen). The batteries are located on the back
of the thermostat’s circuit board. The front portion of the thermostat can be
removed from the back half by using the tabs on the top edge of the thermostat
housing.
When installing new batteries, we recommend using only brand new Energizer ®
or DURACELL ® , “AA” size alkaline batteries. Please observe the polarity
markings shown in the battery compartment to ensure proper installation. When
finished, line up the front of the thermostat to the base, and firmly press together
to securely latch the front and back halves together properly.

BATTERY GRAPHIC: Anytime that batteries are
physically present in the thermostat, there will be
a visual indication of the remaining battery life
available on the thermostat’s display screen.
When brand new batteries are installed in the
battery compartment, this graphic should indicate
full battery life remaining with all bars present.
Over time, as the battery life decreases to the
point of having only 1 bar left, the Temperature
and Clock digits will start to alternate between
showing their normal content, and the words “LO
BATT”. At this point the batteries will need to be
replaced as soon as practical to avoid uninterrupted operation of your heating
and/or cooling system. In most cases, the thermostat will be capable of
providing you approximately two months of normal operation once the point of 1
bar left has been reached, and the screen shows the words “LO BATT”.

TECHNICAL ASSISTANCE:
If you have any problems installing or using this thermostat, please carefully and
thoroughly review the instruction manual. If you require assistance, please
contact our Technical Assistance department at 856-234-8803 during regular
business hours between 8:00AM and 4:30PM Eastern Standard Time, Monday
through Friday. You can also receive technical assistance online anytime day or
night at http://www.luxproducts.com. Our website offers you troubleshooting
guides, answers to the most common technical questions, and also permits you
to email your questions to our technical support staff at your convenience.

LIMITED WARRANTY:
If this unit fails because of defects in materials or workmanship within three
years of the 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 the 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 location from which the
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. and Canada only.

MERCURY WARNING AND RECYCLING NOTICE:
Mercury is considered to be a hazardous material. If this product is replacing a
thermostat that contains mercury in a sealed tube, contact your local waste
management authority for instructions regarding recycling and proper disposal.
It may be unlawful in your state to place it in the trash.

TU
DAY

FAN

HEAT
FILTER
%LEFT
SETBACK

SET
HOLD

Mt. Laurel, New Jersey 08054, USA
http://www.luxproducts.com
856-234-8803
33

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