Lux Products LuxPro P521U 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
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
P521U
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.
52126

2
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
TU
DAY
SET
ROOM
FAN
LCD Display Screen
P521U
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
LUXPRO dealer for thermostats to control these systems.
SYSTEM COMPATIBILITY:

• 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)
3
TOOLS YOU MAY NEED:
FEATURES:

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.
4
REMOVE OLD THERMOSTAT:
MOUNTING LOCATION:
OFF

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 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
WIRING INFORMATION:
INSTALL THERMOSTAT BASE:
THERMOSTAT TOP VIEW

• 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.
• 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.
• 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.
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
CAUTIONS AND WARNINGS:

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 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.
7

8
#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:

9
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

10
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

11
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

12
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

13
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

14
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

15
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

16
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

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.
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
17
ON
12345678
HARDWARE SETUP OPTIONS:

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.
18

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.
19
COMPLETE THE INSTALL:
ELEC
GAS
BATTERY

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
FRONT PANEL ITEMS: