P521U
SMART TEMP® UNIVERSAL
5/2-DAY PROGRAMMABLE THERMOSTAT
(FOR BOTH CONVENTIONAL AND HEAT PUMP SYSTEMS)
INSTALLATION AND OPERATING INSTRUCTIONS
52126
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.
SYSTEM COMPATIBILITY. . . . . . . . 2
FEATURES . . . . . . . . . . . . . . . . . 3
TOOLS YOU MAY NEED . . . . . . . . . 3
MOUNTING LOCATION . . . . . . . . . 4
REMOVE OLD THERMOSTAT . . . . . 4
INSTALL THERMOSTAT BASE. . . . . 5
WIRING INFORMATION . . . . . . . . . 5
CAUTIONS AND WARNINGS. . . . . . 6
WIRING DIAGRAMS . . . . . . . . . . . 8
HARDWARE SETUP OPTIONS. . . . 17
COMPLETE THE INSTALL. . . . . . . 19
FRONT PANEL ITEMS . . . . . . . . . 20
OPERATING INSTRUCTIONS. . . . . 21
TEMPERATURE PROGRAMS. . . . . 24
ADVANCED FEATURES . . . . . . . . 25
BATTERY REPLACEMENT. . . . . . . 32
TECHNICAL ASSISTANCE. . . . . . . 33
LIMITED WARRANTY . . . . . . . . . 33
MERCURY NOTICE . . . . . . . . . . . 33
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.
© 2012 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
FEATURES:
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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
TOOLS YOU MAY NEED:
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Screwdrivers
Wire Stripper
Wire Cutter
Drill with assorted drill bits (new installations only)
3
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
F
OF
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.
4
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. 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).
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.
5
CAUTIONS AND WARNINGS:
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The 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. Failure to follow these battery
instructions could result in property damage and/or personal injury.
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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 which 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.
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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.
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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.
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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.
Additional information is available at our website luxproducts.com. You
should consult a qualified HVAC technician or an electrician if you do
not fully understand the installation instructions.
6
WIRING DIAGRAM NOTES:
(Important, please read all notes before connecting wires)
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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.
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If your old thermostat has both a “Y” and “C” wire 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.
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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.
7
WIRING DIAGRAMS:
DIAGRAM SYSTEM TYPE / DESCRIPTION
PAGE #
#1
#2
#3
#4
#5
#6
#7
#8
CONVENTIONAL:
CONVENTIONAL:
CONVENTIONAL:
CONVENTIONAL:
CONVENTIONAL:
CONVENTIONAL:
HEAT PUMP:
HEATING....................................8
1-STAGE OR 2-STAGE
2, 3, 4, 5 WIRES
HEATING....................................9
3-WIRE ZONE VALVE
3, 4 WIRES
COOLING..................................10
1-STAGE
3, 4 WIRES
HEATING AND COOLING ................11
1-STAGE HEAT
4, 5 WIRES
HEATING AND COOLING ................12
2-STAGE HEAT
5, 6 WIRES
HEATING AND COOLING ................13
TWO-TRANSFORMERS
5, 6 WIRES
HEATING AND COOLING ................14
SINGLE-STAGE ONLY
4, 5 WIRES
HEAT PUMP:
HEATING AND COOLING ................15
WITH AUX / EMERGENCY HEAT
5, 6 WIRES
8
2, 3, 4, 5 WIRES
#1
1-STAGE OR 2-STAGE, HEATING ONLY
(INCLUDING MILLIVOLT) (2-WIRE HEAT USE “RH” & “W1”)
Factory RH-RC Jumper Wire Installed
O
B
G
Y
RC
RH
W1
A
W2
C
FAN WIRE
MAY NOT BE
PRESENT IN
ALL SYSTEMS
G
F
R
W
W2
C
X
RH
V
W1
4
B*
O
P
T
I
O
N
A
L
SYSTEM COMMON
STAGE
1
STAGE
SYSTEM 24V
TRANSFORMER
FAN
2
HEATER
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
3, 4 WIRES
#2
HOT WATER HEATING ONLY
(WITH A 3-WIRE ZONE VALVE)
Factory RH-RC Jumper Wire Installed
O
B
G
Y
RC
RH
W1
A
W2
C
R
W
A
C
X
RH
V
W1
4
B*
O
P
T
I
O
N
A
L
SYSTEM COMMON
OPEN
CLOSE
SYSTEM 24V
TRANSFORMER
3-WIRE ZONE VALVE
OPEN = Heat On
CLOSE = Heat Off
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
3, 4 WIRES
#3
1-STAGE, COOLING ONLY
Factory RH-RC Jumper Wire Installed
O
B
G
Y
RC
RH
W1
A
W2
C
G
F
Y
Y1
6
R
C
X
RC
V
B*
O
P
T
I
O
N
A
L
SYSTEM COMMON
SYSTEM 24V
TRANSFORMER
AIR
CONDITIONER
FAN
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
4, 5 WIRES
#4
CONVENTIONAL (NON HEAT PUMP)
1-STAGE HEATING AND 1-STAGE COOLING
Factory RH-RC Jumper Wire Installed
O
B
G
Y
RC
RH
W1
A
W2
C
G
F
Y
Y1
6
R
W
C
X
RH
RC
V
W1
4
B*
O
P
T
I
O
N
A
L
SYSTEM COMMON
AIR
CONDITIONER
SYSTEM 24V
TRANSFORMER
FAN
HEATER
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
5, 6 WIRES
#5
CONVENTIONAL (NON HEAT PUMP)
2-STAGE HEATING AND 1-STAGE COOLING
Factory RH-RC Jumper Wire Installed
O
B
G
Y
RC
RH
W1
A
W2
C
G
F
Y
Y1
6
R
W
W2
C
X
RH
RC
V
W1
4
B*
O
P
T
I
O
N
A
L
SYSTEM COMMON
STAGE
1
STAGE
2
AIR
CONDITIONER
SYSTEM 24V
TRANSFORMER
FAN
HEATER
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
5, 6 WIRES
#6
1-STAGE HEATING AND 1-STAGE COOLING
WITH TWO SEPARATE 24V TRANSFORMERS
Factory RH-RC Jumper Wire REMOVED
O
B
G
Y
RC
RH
W1
A
W2
C
G
F
Y
RC
RH
W
C
X
Y1
6
R
V
R
V
W1
4
B*
O
P
T
I
O
N
A
L
SYSTEM COMMON
AIR
CONDITIONER
COOL 24V
TRANSFORMER
HEAT 24V
TRANSFORMER
FAN
HEATER
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
SINGLE-STAGE HEAT PUMP SYSTEM
WITH NO AUX OR EMERGENCY HEAT
4, 5 WIRES
#7
** Use “O” or “B”
Terminals, Never Both
CUSTOMER INSTALLED Y-W1 Jumper Wire
Factory RH-RC Jumper Wire Installed
O
B
G
Y
RC
RH
W1
A
W2
C
O
G
F
Y
Y1
6
R
C
X
RC
V
B*
O
P
T
I
O
N
A
L
SYSTEM COMMON
REVERSING
VALVE
SYSTEM 24V
TRANSFORMER
FAN
HEAT PUMP
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
5, 6 WIRES
2-HEAT / 1-COOL, HEAT PUMP SYSTEM
WITH AUX AND EMERGENCY HEAT
#8
** Use “O” or “B”
Terminals, Never Both
CUSTOMER INSTALLED Y-W1 Jumper Wire
Factory RH-RC Jumper Wire Installed
O
B
G
Y
RC
RH
W1
A
W2
C
O
G
F
Y
R
W2
C
X
Y1
6
RC
V
W3
W
B*
O
P
T
I
O
N
A
L
SYSTEM COMMON
REVERSING
VALVE
SYSTEM 24V
TRANSFORMER
AUX / EMERG.
HEAT
FAN
HEAT PUMP
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
HARDWARE SETUP OPTIONS:
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:
ON
1
2
3
4
5
6
7
8
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.
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
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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.
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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.
BATTERY
[DOWN = GAS, default] This setting lets
the heating system control the blower fan
automatically by itself. Systems that
would typically use the “GAS” setting
ELEC
would be: natural gas, propane, or oil
furnaces. This setting has no effect upon
Cool mode operation. [UP = ELEC/HP]
GAS
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.
COMPLETE THE INSTALL:
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.
19
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 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.
20
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.
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.
21
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
HEAT MODE
COOL MODE
MORN 6:00 AM 70 °F (21 °C) 6:00 AM 78 °F (26 °C)
DAY
EVE
8:00 AM 62 °F (17 °C) 8:00 AM 82 °F (28 °C)
6:00 PM 70 °F (21 °C) 6:00 PM 78 °F (26 °C)
NITE 10:00 PM 62 °F (17 °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 characteristics, you should refer
to your heat pump literature to determine when to disable the heat pump
and run in Emergency Heat mode.
22
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.
MINIMUM RUN TIME: The thermostat has a default internal time delay of
5 minutes between load-on and load-off activations to prevent heating or
cooling system damage, which can occur from very frequent cycling. If
heating or cooling does not turn on right away with a manual change in
set temperature, please wait at least 5 minutes and the system should
resume normal operation.
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.
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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 (HARDWARE 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 weekend program, with the MORN period start
time flashing. You will be setting the program periods for both Saturday
and Sunday (grouped together). Perform the same steps that you used
for setting the weekday periods, pressing the NEXT button to advance
through each flashing value. Return the Set Slide switch to the RUN
position when you are finished.
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ADVANCED FEATURES:
TEMPERATURE SWING AND OFFSET SETTING: 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. 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.
There is only one Swing setting, and this determines the cut-in and cut-
out points for both the first and second stages (if present), in both Heat
mode and Cool mode.
NOTE: The Swing and Offset settings need to be performed in a timely
manner, as the thermostat will timeout and automatically exit these
adjustment screens after approximately 10 seconds without a button
press.
TO CHANGE THE SWING SETTING: Ensure that the System Mode switch
is in the OFF position and the Set Slide switch is in the RUN position.
Press and hold the HOLD button for at least 5 seconds. The words “SET”
and “SWING” will appear on the screen, along with a single flashing digit.
Use the UP/DOWN buttons to change the number value between 1 and 9
(0.25F to 2.25F, in 0.25F degree increments). Number 1 is the default
setting. Press the NEXT button to accept the swing setting and proceed
to the OFFSET setting.
TO CHANGE THE OFFSET: After the Swing value has been accepted, the
words “SET” and “OFFSET” will be shown on the screen, along with a
flashing digit. This setting is shown as a number of degrees, and is
similar in nature to the Swing however this only effects the operation of
the second (auxiliary) heating stage, if present. The setting range for
Offset is from 0 to 9 degrees. When set to 0 degrees, the second heating
stage is completely disabled while in regular Heat mode (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.
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71
70
69
68
67
66
Cut-In / Cut-Out
(1st Stage)
70˚F Set
Temperature
Swing
Setting=
#2 (+/- 0.5˚F)
Offset **
Setting=
4˚F degrees
(2nd Stage) **
Cut-In / Cut-Out
65
DEGREES (F)
** = Only applies if a second
heat stage is present
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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.
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.
this 2-digit code is “00”, and the temperature stops can be uh
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KEYPAD LOCKOUT: You can lock the front panel buttons to prevent
unauthorized tampering of your thermostat settings.
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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 Air Filter Monitor counts the duration of filter usage that has
occurred, since the last time the Filter Monitor has been reset. 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 completely expired, 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 word “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 top of the screen
tell you the quantity of filter days remaining. Press both the UP and
DOWN buttons together, 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.
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HARDWARE RESET: The Hardware Reset button
(labeled “HW RST”) is a small round push
button that is located towards the right side 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, read the
position of the Hardware Setup Option
HW RST
switches, 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: The Software Reset button
(labeled “SW RST”) is a small round push
button that is located towards the left side of
the circuit board, just below the battery holder.
A Software Reset is used to erase all heating
and cooling temperature programs, and any
SW RST
user-adjustable software values such as: Swing,
Offset, and Calibration, to their original factory
default values. To perform a Software Reset,
press and hold the Software Reset button for at
least 5 seconds. The LCD display screen will become fully populated,
then return to normal. The thermostat will still retain the current day and
time even after a Software Reset has been performed.
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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 the “LOW BATT” icon appears at the top of the display
screen). The batteries are located on the back of the thermostat, at the
top of the circuit board. The front portion of the thermostat can be
removed from the back half by pulling straight outwards on the top and
bottom of the thermostat housing, at the large indentations that are
present in the center of the top and bottom edges.
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.
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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
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.
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T
U
:
DAY
5 36P
FAN
HEAT
˚F
˚
72
ROOM
SET
74
HOLD
Mt. Laurel, New Jersey 08054, USA
856-234-8803
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