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