Lux Products LuxPro Smart Temp P621U User manual

CAUTIONS AND WARNINGS . . . . . . . . . . 2
SYSTEM COMPATIBILITY . . . . . . . . . . . . 3
FEATURES . . . . . . . . . . . . . . . . . . . . . . . 4
TOOLS YOU MAY NEED. . . . . . . . . . . . . . 4
MOUNTING LOCATION . . . . . . . . . . . . . . 5
REMOVE OLD THERMOSTAT . . . . . . . . . . 5
INSTALL THERMOSTAT BASE . . . . . . . . . 6
WIRING INFORMATION . . . . . . . . . . . . . . 6
WIRING DIAGRAMS . . . . . . . . . . . . . . . . 8
HARDWARE SETUP OPTIONS . . . . . . . . 17
COMPLETE THE INSTALL . . . . . . . . . . . 19
FRONT PANEL ITEMS . . . . . . . . . . . . . . 19
OPERATING INSTRUCTIONS . . . . . . . . . 21
TEMPERATURE PROGRAMS . . . . . . . . . 23
ADVANCED FEATURES . . . . . . . . . . . . . 24
BATTERY REPLACEMENT . . . . . . . . . . . 31
TECHNICAL ASSISTANCE . . . . . . . . . . . 31
LIMITED WARRANTY . . . . . . . . . . . . . . 32
MERCURY NOTICE . . . . . . . . . . . . . . . . 32
WARNING: Use Energizer®or DURACELL® Alkaline Batteries Only.
Energizer®is a registered trademark of Eveready Battery Company, Inc.
DURACELL®is a registered trademark of The Procter & Gamble Company
© 2013 LUX PRODUCTS CORPORATION. ALL RIGHTS RESERVED
SMART TEMP®UNIVERSAL
5/1/1-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.
52161
P621U

• This thermostat requires batteries to operate and failure or sub-standard
performance of the batteries may impair or prevent the correct operation of
the thermostat. Use Duracell®or Energizer®alkaline batteries ONLY for all
LUXPRO thermostats requiring batteries. BE SURE TO CHANGE THE BATTERIES
AT LEAST ONCE A YEAR, or whenever you see the LO BATT indication on the
screen. Failure to follow these battery instructions could result in property
damage and/or personal injury.
• The electrical rating for this thermostat is 1.5 Amps per terminal, with a
maximum total load of 3.0A for all terminals combined.
• The thermostat contains parts that may wear out through use and are
susceptible to failure if over-loaded or used in a manner other than as
indicated in the documentation.
• Check unoccupied residences regularly to ensure that all systems are
operating properly.
• Check any heating/air-conditioning system including this product before
operation and at regular intervals.
• Electrical interference, static electricity, failure or substandard performance of
batteries, wiring defects in the installation and/or characteristics of the
connected HVAC devices may prevent the system from regulating heating and
cooling as anticipated.
• The thermostat is a sensitive device and dropping the product can cause
damage to critical components. If the product is dropped or shaken violently
during transport or installation then it should be replaced immediately.
• Persons with physical or mental limitations may not be able to promptly
respond to a malfunction of the heating/air-conditioning system.
• All residents should be made aware of the potential in any system for
malfunctions that could cause continuous heating or cooling and should be
familiar with the operation and location of the heating/cooling appliance on/off
switch.
• Read the instruction manual completely before installing the thermostat. You
should consult a qualified HVAC technician or an electrician if you do not fully
understand the installation instructions.
2
CAUTIONS AND WARNINGS:

SETBACK 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
D
AY
S ET
FAN
40 %L
EFT
F ILTER
LCD Display Screen
P621U
UP / DOWN 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:
3

• 1 or 2-Heat / 1-Cool, 5/1/1-day programming
• Universal Compatibility for all system types
• Weekdays, Saturday, and Sunday can be programmed separately
• Exclusive LUX®Speed 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
• Graphical filter monitor
• Keypad lockout for unauthorized users
• Manual temperature hold
• Adjustable vacation hold (1 to 30 days)
• Temporary temperature override
• Adjustable temperature differential / cycle-rate
• Adjustable 2nd heat stage Offset setting
• User temperature calibration
• Adjustable heat/cool set temperature limit stops
• Smart recovery
• Dual-powered (battery and/or 24-volt system powered)
• Battery-free memory storage
• F/C temperature display
• 12/24-hour clock display
• 5/2-minute selectable time delay for equipment protection
• Screwdrivers
• Wire Stripper
• Wire Cutter
• Drill with assorted drill bits (new installations only)
TOOLS YOU MAY NEED:
FEATURES:
4

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
5

1. Strip wire insulation leaving only 3/8 in. (9.5mm) bare wire ends, and clean off
any corrosion present.
2. Fill the wall opening with non-combustible insulation to prevent drafts from
affecting the thermostat’s normal operation.
3. Separate new thermostat housing using your thumb and index finger. Provide
pressure in opposite directions to the release tabs on the top of the housing,
in the directions shown in the diagram shown above.
4. Route the wires through the opening in the new thermostat base plate, and
hold the base against the wall. Try to line up the screw holes from the prior
thermostat, and install the mounting screws.
5. If the previous holes cannot be used, hold the thermostat base against the
wall so that it appears straight and level (position the base for best
appearance) and mark for the new screw holes. Attach the base to the wall
using the screws provided (use the supplied plastic anchors if needed when
mounting to a soft material such as drywall).
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:
6
INSTALL THERMOSTAT BASE:
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.
7

8
#1 CONVENTIONAL: HEATING ............................................................9
1-STAGE OR 2-STAGE
2, 3, 4, 5 WIRES
#2 CONVENTIONAL: HEATING ..........................................................10
3-WIRE ZONE VALVE
3, 4 WIRES
#3 CONVENTIONAL: COOLING ..........................................................11
1-STAGE
3, 4 WIRES
#4 CONVENTIONAL: HEATING AND COOLING .....................................12
1-STAGE HEAT
4, 5 WIRES
#5 CONVENTIONAL: HEATING AND COOLING .....................................13
2-STAGE HEAT
5, 6 WIRES
#6 CONVENTIONAL: HEATING AND COOLING .....................................14
TWO-TRANSFORMERS
5, 6 WIRES
#7 HEAT PUMP: HEATING AND COOLING .....................................15
SINGLE-STAGE ONLY
4, 5 WIRES
#8 HEAT PUMP: HEATING AND COOLING .....................................16
WITH AUX / EMERGENCY HEAT
5, 6 WIRES
DIAGRAM SYSTEM TYPE / DESCRIPTION PAGE #
WIRING DIAGRAMS:

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
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
O
P
T
I
O N
A
L
9

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
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
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
10

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
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
O
P
T
I
O N
A
L
AIR
CONDITIONER
11

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
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
O
P
T
I
O N
A
L
12

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
W2
RH
RC
V
R
Y1
6
Y
F
G
XW1
4
W
B*
W1 AW2 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
O
P
T
I
O N
A
L
HEATER
STAGE
1
STAGE
2
13

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
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
CONVENTIONAL (NON HEAT PUMP) 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
O
P
T
I
O N
A
L
14

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
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
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
15

NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
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
HEAT PUMP
REVERSING
VALVE
** Use “O” or “B”
Terminals, Never Both
AUX / EMERG.
HEAT
O
P
T
I
O N
A
L
16

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 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
17
ON
12345678
HARDWARE SETUP OPTIONS:

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.
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).
18

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.
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
19
COMPLETE THE INSTALL:
FRONT PANEL ITEMS:
ELEC
GAS
BATTERY

thermostat’s “G” wire terminal, to control a blower fan. The Fan Mode switch
has no effect in systems that do not have a blower fan (such as a hot water
radiator system).
MULTI-FUNCTION, SET SLIDE SWITCH: This switch provides an easy way to
quickly access the most commonly used thermostat settings. This switch has 4
individual positions, and unless a specific setting is being adjusted, this switch
should always remain in the RUN position for the thermostat to control the room
temperature. The other Set Slide switch positions are described in greater detail
in the ADVANCED FEATURES section. NOTE: this switch is only operable when the
thermostat is in “Programmable” mode. When the thermostat is used in
“Manual” control mode, all 4 of the switch positions will act like the RUN
position, except the “AIR FILTER” position.
SETBACK BUTTON: This button activates and deactivates the SETBACK feature,
which overrides the set temperature for an adjustable duration. This feature is
described in greater detail in the ADVANCED FEATURES section.
UP / DOWN BUTTONS: The UP and DOWN buttons are used to adjust any item
that can be changed by the user. Examples are the set temperatures, clock
times, and days of the week. In many cases, an item may be flashing if it can
currently be adjusted.
HOLD BUTTON: This button activates and deactivates the manual Temperature
Hold feature.
EMER BUTTON: When in Normal Run mode, the usage of this button varies
depending upon your specific system configuration. For heat pump systems,
pressing this button enables your emergency heat function, which is described in
greater detail in the OPERATING INSTRUCTIONS section. For conventional
systems, there is no such thing as emergency heat, so this button will have no
effect.
20