Lux Products TX500U User manual

SYSTEM COMPATIBILITY . . . . . . . . . 2
FEATURES . . . . . . . . . . . . . . . . . . . 3
TOOLS YOU MAY NEED . . . . . . . . . . . 3
MOUNTING LOCATION . . . . . . . . . . . 4
REMOVE OLD THERMOSTAT . . . . . . . 4
INSTALL THERMOSTAT BASE . . . . . . . 5
WIRING INFORMATION . . . . . . . . . . . 5
WIRING DIAGRAMS . . . . . . . . . . . . . 7
HARDWARE SETUP OPTIONS . . . . . . 16
COMPLETE THE INSTALL . . . . . . . . . 18
FRONT PANEL ITEMS . . . . . . . . . . . 18
OPERATING INSTRUCTIONS . . . . . . . 20
TEMPERATURE PROGRAMS . . . . . . . 22
ADVANCED FEATURES . . . . . . . . . . 23
BATTERY REPLACEMENT . . . . . . . . . 29
TECHNICAL ASSISTANCE. . . . . . . . . 30
LIMITED WARRANTY . . . . . . . . . . . 30
MERCURY NOTICE . . . . . . . . . . . . . 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.
© 2011 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
TX500U
SMART TEMP®UNIVERSAL
5/2-DAY PROGRAMMABLE THERMOSTAT
(FOR BOTH CONVENTIONAL AND HEAT PUMP SYSTEMS)
INSTALLATION AND OPERATING INSTRUCTIONS
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.
52105

HOLD
SET
RUN
DAY/TIME
TEMP PROG
AIR FILTER
TEMPERATURE
HEAT
OFF
COOL
FAN
AUTO
ON
EMER
NEXT
74
F
˚
72
F
˚
5:36 P
HEAT
T
U
DAY
S
ET
R
OOM
FAN
LCD Display Screen
TX500U
UP, DOWN and HOLD Buttons
Set Slide
Switch
Fan Mode
Switch
System Mode
Switch
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.
SYSTEM COMPATIBILITY:
2

• 1 or 2-Heat / 1-Cool, 5/2-day programming
• Universal Compatibility for all system types
• Weekdays and Weekends can be programmed separately
• Exclusive LUX®Speed SlideTM 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
• Keypad lockout for unauthorized users
• Manual temperature hold
• 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
• Screwdrivers
• Wire Stripper
• Wire Cutter
• Drill with assorted drill bits (new installations only)
TOOLS YOU MAY NEED:
FEATURES:
3

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.
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.
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.
REMOVE OLD THERMOSTAT:
MOUNTING LOCATION:
OFF
4

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. 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.
4. 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).
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 INFORMATION:
5
INSTALL THERMOSTAT BASE:
Small Indentation:
Door Release
Large Indentation:
Front Housing Release
THERMOSTAT TOP VIEW

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.
6

7
#1 CONVENTIONAL: HEATING .............................................8
1-STAGE OR 2-STAGE
2, 3, 4, 5 WIRES
#2 CONVENTIONAL: HEATING .............................................9
3-WIRE ZONE VALVE
3, 4 WIRES
#3 CONVENTIONAL: COOLING............................................10
1-STAGE
3, 4 WIRES
#4 CONVENTIONAL: HEATING AND COOLING...........................11
1-STAGE HEAT
4, 5 WIRES
#5 CONVENTIONAL: HEATING AND COOLING...........................12
2-STAGE HEAT
5, 6 WIRES
#6 CONVENTIONAL: HEATING AND COOLING...........................13
TWO-TRANSFORMERS
5, 6 WIRES
#7 HEAT PUMP: HEATING AND COOLING...........................14
SINGLE-STAGE ONLY
4, 5 WIRES
#8 HEAT PUMP: HEATING AND COOLING...........................15
WITH AUX / EMERGENCY HEAT
5, 6 WIRES
DIAGRAM SYSTEM TYPE / DESCRIPTION PAGE #
WIRING DIAGRAMS:

W1
4
W
XF
G
B*
W2
RH
V
R
W1 A W2O B CG Y RC RH
1-STAGE OR 2-STAGE, HEATING ONLY
(INCLUDING MILLIVOLT) (2-WIRE HEAT USE “RH” & “W1”)
Factory RH-RC Jumper Wire Installed
#12, 3, 4, 5 WIRES
C
HEATER
STAGE
1
STAGE
2
FAN SYSTEM 24V
TRANSFORMER
SYSTEM COMMON
FAN WIRE
MAY NOT BE
PRESENT IN
ALL SYSTEMS
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
O
P
T
I
O
N
A
L
8

X
B*
C
RH
V
R
W1
4
W A
W1 A W2O B CG Y RC RH
HOT WATER HEATING ONLY
(WITH A 3-WIRE ZONE VALVE)
Factory RH-RC Jumper Wire Installed
#23, 4 WIRES
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
SYSTEM 24V
TRANSFORMER
SYSTEM COMMON
OPEN = Heat On
CLOSE = Heat Off
3-WIRE ZONE VALVE
OPEN CLOSE
O
P
T
I
O
N
A
L
9

XF
G
Y1
6
Y
B*
RC
V
R
W1 A W2O B CG Y RC RH
1-STAGE, COOLING ONLY
Factory RH-RC Jumper Wire Installed
#3
C
FAN SYSTEM 24V
TRANSFORMER
SYSTEM COMMON
3, 4 WIRES
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
O
P
T
I
O
N
A
L
AIR
CONDITIONER
10

RH
RC
V
R
Y1
6
Y
F
G
XW1
4
W
B*
W1 A W2 CGO BYRC RH
CONVENTIONAL (NON HEAT PUMP)
1-STAGE HEATING AND 1-STAGE COOLING
Factory RH-RC Jumper Wire Installed
#4
C
FAN SYSTEM 24V
TRANSFORMER
SYSTEM COMMON
HEATER
AIR
CONDITIONER
4, 5 WIRES
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
O
P
T
I
O
N
A
L
11

W2
RH
RC
V
R
Y1
6
Y
F
G
XW1
4
W
B*
W1 A W2 CGO BYRC RH
CONVENTIONAL (NON HEAT PUMP)
2-STAGE HEATING AND 1-STAGE COOLING
Factory RH-RC Jumper Wire Installed
#5
C
FAN SYSTEM 24V
TRANSFORMER
SYSTEM COMMON
AIR
CONDITIONER
5, 6 WIRES
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
O
P
T
I
O
N
A
L
HEATER
STAGE
1
STAGE
2
12

X
B*
C
R
V
RH
R
V
RC
Y1
6
Y
F
G
W1
4
W
W1 A W2O B CG Y RC RH
1-STAGE HEATING AND 1-STAGE COOLING
WITH TWO SEPARATE 24V TRANSFORMERS
Factory RH-RC Jumper Wire REMOVED
#6
FAN HEAT 24V
TRANSFORMER
COOL 24V
TRANSFORMER
SYSTEM COMMON
HEATER
AIR
CONDITIONER
5, 6 WIRES
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
O
P
T
I
O
N
A
L
13

O
XF
G
Y1
6
Y
B*
RC
V
R
W1 A W2O B CG Y RC RH
SINGLE-STAGE HEAT PUMP SYSTEM
WITH NO AUX OR EMERGENCY HEAT
#7
C
FAN SYSTEM 24V
TRANSFORMER
SYSTEM COMMON
4, 5 WIRES
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
O
P
T
I
O
N
A
L
HEAT PUMP
REVERSING
VALVE
** Use “O” or “B”
Terminals, Never Both
CUSTOMER INSTALLED Y-W1 Jumper Wire
Factory RH-RC Jumper Wire Installed
14

CUSTOMER INSTALLED Y-W1 Jumper Wire
X
B*
C
W3
W
W2
O
F
G
Y1
6
Y
RC
V
R
W1 A W2O B CG Y RC RH
2-HEAT / 1-COOL, HEAT PUMP SYSTEM
WITH AUX AND EMERGENCY HEAT
Factory RH-RC Jumper Wire Installed
#8
FAN SYSTEM 24V
TRANSFORMER
SYSTEM COMMON
5, 6 WIRES
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
HEAT PUMP
REVERSING
VALVE
** Use “O” or “B”
Terminals, Never Both
AUX / EMERG.
HEAT
O
P
T
I
O
N
A
L
15

On the thermostat’s circuit board, there is a row of DIP switches, labeled #1
through #8. The position of these switches will change how the thermostat
operates, and also how information is conveyed to you on the LCD display
screen. If you make any changes to these options, the changes are not
recognized unless you either: change the position of the HEAT/OFF/COOL
mode switch, or press the “HW RST” (Hardware Reset) button on the circuit
board. The use of this button is further described in the “ADVANCED
FEATURES” section of this manual.
These option switches are very small and should be moved carefully using
objects such as: eyeglass screwdriver, fine-point pen, toothpick, or similar.
The listing below describes the available choices for each option switch:
SWITCH #1 (SYSTEM): [OFF/DOWN = FURN, default] This setting is used for
the majority of all heating systems that are not heat pumps. Examples for
this setting would be: natural gas furnace, hot water baseboard heat, and oil
heat. [ON/UP = HP] Use this setting if you have a heat pump unit (which
looks just like an outside air conditioning unit, but is used for both cooing
and heating).
SWITCH #2 (TYPE): [OFF/DOWN = PROG, default] The thermostat controls
the room temperature by following temperature program periods that you set
up based upon your daily routine. [ON/UP = MAN] The thermostat operates
manually just like a mechanical or non-programmable model. This method
of operation is very basic and only shows the room temperature and set
temperature; there are no temperature programs, days of the week, or clock
times.
16
ON
12345678
HARDWARE SETUP OPTIONS:

SWITCH #3 (PERIODS): [OFF/DOWN = 4, default] The thermostat uses four
temperature program periods in both heating and cooling (MORN, DAY, EVE,
and NITE). Each period has a separate start time and a set temperature.
[ON/UP = 2] The thermostat operates in the same manner as above, however
there are only two temperature program periods for heating and cooling
(DAY and NITE). This may be more convenient if you are typically home
during the day, and only need the set temperature to be different while you
are sleeping.
SWITCH #4 (SCALE): [OFF/DOWN = F, default] All temperature values are
displayed using the Fahrenheit scale. [ON/UP = C] This setting displays all
temperature values using the Celsius scale.
SWITCH #5 (TIME): [OFF/DOWN = 12 HR, default] This setting displays the
clock times and temperature program period start time values on the screen
using US standard AM and PM values. [ON/UP = 24 HR] This setting
displays the clock and temperature program period start time values on the
screen using the 24 HR military-time format (17:30 hours, 22:00 hours,
without using AM/PM).
SWITCH #6 (DELAY): [OFF/DOWN = 5 MIN, default] 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 internal delay
prevents rapid cycling of your system and provides equipment protection
particularly for cooling units. The 5-minute setting is fine for most
applications. [ON/UP = 2 MIN] If you feel that your system may need to
cycle more frequently than the thermostat is allowing, then you may use the
2-minute setting.
SWITCH #7 (RECOVERY): [OFF/DOWN = DISABLE, default] The Early
Recovery feature affects how the thermostat transitions from an energy
saving setback (DAY and NITE) program period, to a comfort (MORN and
EVE) program period temperature, when it is following the daily temperature
programs. When this is disabled, the thermostat makes a set temperature
change at the beginning of an upcoming period's start time. [ON/UP =
ENABLE] The Early Recovery feature will calculate the capability of your
system and turn on the heating or cooling early so that the temperature in
your home reaches the desired set point as close as possible to the start of
the period. During the time that the thermostat is performing a recovery, the
word “RECOV.” will be shown in the display screen.
17

SWITCH #8 (BATTERY MONITOR): [OFF/DOWN = ON, default] This setting,
regularly monitors the battery level, and shows “LOW BAT” on the screen if
the batteries need to be replaced. Use this setting at all times when
batteries are present in the thermostat. [ON/UP = OFF] This setting only
applies if you are NOT physically using batteries in the thermostat, and are
powering the thermostat entirely from the system (“C” wire terminal).
GAS / ELEC SLIDE SWITCH (FAN OPERATION):
This switch is a physical component by itself on
the circuit board, and is much larger than the
DIP switches listed above. [DOWN = GAS,
default] This setting lets the heating system
control the blower fan automatically by itself.
Systems that would typically use the “GAS”
setting would be: natural gas, propane, or oil
furnaces. This setting has no effect upon Cool
mode operation. [UP = ELEC/HP] This setting
runs the system’s blower fan when heat is called for, and is required for
heating systems that do not control their own fan while the thermostat is in
HEAT mode. Heat pump systems, and units with an electric heating element
typically require this setting.
Once the hardware options are set, install two new Energizer®or DURACELL®
"AA" size alkaline batteries. Ensure that the batteries are installed in the
proper direction as per the markings shown in the battery tray. If the
batteries were already installed before changing the hardware setup options,
change the position of the HEAT/OFF/COOL System Mode switch to accept
the new hardware option switch settings.
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.
18
COMPLETE THE INSTALL:
FRONT PANEL ITEMS:
ELEC
GAS
BATTERY

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 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.
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.
19

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).
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
20
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)
OPERATING INSTRUCTIONS: