Lennox X4146 User manual

E2005 Lennox Industries Inc.
Dallas, Texas, USA
Elite®Series 1 Heat / 1 Cool Programmable
Touch Screen Thermostat
INSTALLATION
INSTRUCTIONS
WARNING
This thermostat is to be installed by a qualified service technician or
other qualified agency in accordance with the manufacturer’s instruc-
tions, all codes, and requirements of the authority having jurisdiction.
505,043M
10/2005

Page 2
Table of Contents
General...................................Page 2
Shipping and Packing List........Page 2
NecessaryTools.......................Page 2
Thermostat Location................Page 2
Remove Existing Thermostat...Page 3
Thermostat Installation............Page 4
Wiring Connections..................Page 4
LED Indicator...........................Page 5
Outdoor Temperature Sensor...Page 5
Field Wiring Diagrams..............Page 6
Install Batteries........................Page 8
Attach T’stat to Wallplate..........Page 8
Set Calendar and Clock............Page 8
Installer Set−Up........................Page 9
System Test...........................Page 15
Troubleshooting.....................Page 16
General
The Lennox Elite®Series X4146 ther-
mostat provides control for single−
stage heating and cooling. The ther-
mostat may be used to control either a
conventional HVAC system which in-
cludes an outdoor condensing unit and
indoor furnace or a heat pump unit and
indoor air handler. The thermostat ter-
minal block accommodates 24V power
common from the furnace or air han-
dler. Three AAA alkaline batteries are
provided to be used as an alternate
power source or as a back−up in case
of an interruption of power.
Shipping and Packing List
Package 1 of 1 contains
1 − Assembled thermostat
(includes wallplate and thermostat)
1 − Bag assembly containing the fol-
lowing:
2 − Screws
2 − Wall anchors
3 − AAA alkaline batteries
1 − Installation instruction
1 − Owner’s guide
1 − Warranty certificate
Necessary Tools
•No. 2 Phillips screwdriver
•Standard pocket screwdriver
•Drill
•Drill bits (use 3/16" for drywall and
7/32" for plaster)
•Pencil
•Level
•Hammer
•Electrical tape
Thermostat Location
Install the thermostat about 5 feet
(1.5m) above the floor in an area with
good air circulation.
Do not install the thermostat where it
may be affected by the following:
•Drafts or dead spots behind doors
and in corners.
•Hot or cold air from ducts.
•Radiant heat from the sun or ap-
pliances.
•Concealed pipes or chimneys.
•Adjacent unconditioned areas
(outside wall behind the thermo-
stat)

Page 3
Remove Existing Thermostat
If this thermostat is being used to re-
place an existing thermostat, remove
the old thermostat:
1 − Turn off power at the heating and/or
cooling system or fuse/circuit
breaker panel.
2 − Remove the cover from the existing
thermostat.
3 − Remove securing screws and re-
move existing thermostat from wall
or wallplate. Disconnect the exist-
ing wires.
4 − Remove any remaining portion of
the existing thermostat from the
wall. Do not install the replacement
thermostat faceplate on the exist-
ing wallplate. Though the wall-
plates may appear to be the same
and the faceplate may fit on the ex-
isting wallplate, the terminal posi-
tions may vary in important ways.
In addition, serial number and part
number information is carried on
the replacement wallplate.
Do not allow the thermostat wires
to fall behind the drywall.
WARNING
This thermostat must be
installed using the provided re-
placement wallplate.
Failure to do so will bypass ther-
mostat control and activate con-
tinuous heating.
Y
G
C
R
W
OLD THERMOSTAT
.18
.2
.25 .3
.9
.7
.5
.4
L
O
NGER
THERMOSTAT
COVER
WALLPLATE
WARNING
MERCURY NOTICE
If the existing thermostat includes a mercury bulb, the thermostat must
be disposed of properly.
Contact your local waste management authority for instructions re-
garding recycling and proper disposal of thermostats which include
mercury bulbs.

Page 4
Thermostat Installation
The thermostat may be installed hori-
zontally in a 4 in. X 2 in. (101.6 mm X
50.8 mm) wiring box or on the wall us-
ing the provided anchors.
1 − Separate the wallplate from the
thermostat as shown.
THERMOSTAT
WALLPLATE
WIRE HOLE
2 − Pass the labeled wires through the
hole on the wallplate.
3 − Position the wallplate on the wall
with the arrow pointing up. Level
the wallplate (for appearance only)
and use a pencil to mark the mount-
ing holes.
WALLPLATE
LEVEL
PLACE LEVEL ON
SUPPORT TABS
MARK
MOUNTING
HOLES (2)
4 − If anchors are used, move the wall-
plate aside and drill two new holes
(3/16" for drywall; 7/32" for plaster).
5 − Tap the provided wall anchors into
the drilled holes until the back of the
anchor head touches the wall sur-
face.
6 − Position the wallplate over the an-
chors and pull the thermostat wires
back through the wiring opening.
7 − Secure the wallplate using the pro-
vided screws.
DRILLED
HOLES (2)
WALL
ANCHORS (2)
MOUNTING
SCREWS (2)
WALLPLATE
NOTE
Thermostat heat function will
not operate if thermostat has
been stored at, or is being used
in, ambient temperatures at or
above 90°F. Heat function will be
enabled after thermostat has
been placed in ambient tempera-
tures less than 90°F for about 30
minutes.
Wiring Connections
WARNING
Use minimum 18 guage wire for
all thermostat connections.
IMPORTANT
Do not connect the wires to this
thermostat based on wire color.
Improper wiring may cause
damage to the HVAC system.

Page 5
1 − Make wiring connections per the
appropriate wiring diagram on
pages 6 and 7. Refer to the table
below for terminal designations.
Terminal Description
WFirst−stage heating
(conventional)
S1 Remote outdoor sensor
S2 Remote outdoor sensor
R24V power
OReversing valve
BReversing valve
GFan relay
Y
First−stage compressor
(Conventional or
heat pump)
C24V common
LEquipment monitor
2 − Refer to inner terminal labels when
using the thermostat with conven-
tional systems (gas, oil or electric
heat plus air conditioning). Refer to
outer terminal labels in heat pump
applications. See figure below.
3 − Loosen screws of terminals that will
be used. Insert appropriate wires in
the terminal block under the loos-
ened screws. Securely tighten
each screw.
C
Y
B
O
R
G
INSERT WIRE IN HOLE
WIRE HOLE
WALLPLATE
SCREW
TERMINALS
LETTER
DESIGNATIONS
LABELED WIRES
TERMINAL
BLOCK
4 − Connect wires to the correspond-
ing screw terminals per the ap-
propriate diagram.
5 − Push excess wire back into the
wall.
6 − Plug hole with nonflammable in-
sulation to prevent drafts from af-
fecting thermostat.
LED Indicator
An LED indicator is located in the up-
per right corner of the thermostat. It is
only visible when lit.
When an equipment monitor is con-
nected to the thermostat L terminal,
the LED lights when the monitor sends
a check or failure message to the ther-
mostat.
The LED requires the use of 24Vac
common power. The indicator will not
light when the thermostat is powered
by the batteries alone, or when 24Vac
power is interrupted.
Outdoor Temperature Sensor
Install the optional outdoor tempera-
ture sensor (X4148) as outlined in the
instructions provided with the sensor.

Page 6
Field Wiring Diagrams
TYPICAL COOL ONLY SYSTEM
TYPICAL CONVENTIONAL SINGLE−STAGE HEAT / COOL SYSTEM

Page 7
Field Wiring Diagrams (Continued)
TYPICAL HEAT ONLY SYSTEM WITH FAN
TYPICAL HEAT ONLY SYSTEM

Page 8
Install Batteries
1 − Install three provided AAA alkaline
batteries in the back of the thermo-
stat as shown.
BACK OF THERMOSTAT
BATTERIES
(3)
+
++
2 − Remove tab from the lower right−
hand corner of the thermostat back
to activate the real−time clock.
REMOVE DURING
INSTALLATION
REMOVE
TAB
REMOVE DURING
INSTALLATION
Attach Thermostat to Wallplate
1 − Align the terminal blocks on the
walplate with the pins on the back
of thermostat.
2 − Push the thermostat straight onto
the pins until it snaps into place.
3 − Turn on power at the furnace or air
handler or at the fuse or circuit
breaker.
PINS ON
BACK OF
THERMOSTAT
WALLPLATE
TERMINAL
SCREW
BLOCK
Set Calendar and Clock
This thermostat is designed to auto-
matically keep the current time and
date in memory for up to ten years, un-
der normal use, once the calendar has
been set. When power is first applied to
the thermostat, the display is ready to
set the calendar.
1 − Use the arrow keys to set the year,
month and day.
2 − Press the DONE key.
DONE
USE
ARROWS
TO SET
YEAR
SET
CURRENT
DATE
SET
MONTH
MON WED THU FRI SATTUE
3 − Use the arrow keys to set the cur-
rent time.
4 − Press the DONE key.
DONE
MON WED THU FRI SAT
AM
PM
USE
ARROWS
TO SET
TIME
TUE
NOTE − Date and time may be ad-
justed after the initial set−up using ei-
ther the installer or user set−up menu.

Page 9
Installer Set−Up
Use the following steps and the Install-
er Set−Up menu to match the thermo-
stat to the HVAC system.
1 − Press and release the SYSTEM
key.
2 − Press and hold the two blank keys
on either side of the center blank
key for approximately five seconds.
MON
CANCEL
UET WED THU FRI SATAAT SUN
PM
SS M
EMHT
Y TE
COOL
FOLLOWING
SCHEDULE
SET TO
OFF
DONE
3 − Release the two keys when the
thermostat display matches the
display below.
DONE
4 − Refer to the following figure to see
how the thermostat keys are used
to make selections from the set−up
menu.
DONE
INSTALLER
SET−UP
NUMBER CURRENT
SETTING
ADVANCE TO NEXT
INSTALLER SET−UP
EXIT
INSTALLER
SET−UP
CHANGE THE
CURRENT
SETTING
5 − The installer set−up number is dis-
played on the left−hand side of the
screen. The current installer set−up
number is displayed on the right−
hand side of the screen. Use the up
and down arrows on the right−hand
side of the thermostat to select the
proper setting for that particular
set−up number.
6 − After the proper selection has been
made, use the up arrow in the cen-
ter of the thermostat to advance to
the next set−up screen.
7 − Refer to the tables on pages 10
through 14 to make proper set−up
choices for your application.
8 − When all set−up selections have
been made, press the DONE key to
save your settings. Thermostat dis-
play will return to the main screen.
NOTE − Press and release the SYS-
TEM key, then press and hold the cen-
ter blank key to access the user set−up
screens. The user set−up options are
limited to those features that would be
used by the homeowner. Press the
DONE key when finished.

Page 10
Installer
Set−Up
Number
Installer
Set−Up
Name
Selection Description
(Factory setting in bold print) Notes
0120 Date
(Year/first)
Select first two digits of current calendar
year (20 for 2005, etc.)
Factory setting = 20.
0130 Date
(Year/last)
Select last two digits of current calendar
year (05 for 2005, etc.); 01 to 99 available.
0140 Date
(Month)
Select number that represents current cal-
endar month. Factory setting = 8.
0150 Date
(Day)
Select number that represents current cal-
endar date. Factory setting = 19.
0160
Schedule 0 − Non−programmable.
0160
Schedule
Options 4 − 7−day programming. Factory setting.
1 − Single−Stage Heating and Cooling
(Conventional). Factory setting.
Available
options
and de
-
2 − Single−Stage Heat Pump with No Back−
Up or Auxiliary Heat.
and
de
-
faults vary
by system
type
0170
System
Type
3 − Heat Only without Fan (Conventional)
−− Gas, oil or electric heating without cen-
tral air conditioning.
type
.
System
type
selection
tti
0170
T
ype
4 − Heat Only with Fan (Conventional). automati-
cally
modifies
5 − Hot Water Heat Only (Conventional) −−
Gas or oil hot water heat. Power open/
power close hot water zone valves or nor-
mally open valves.
modifies
certain
default
settings
and
installer
6 − Cooling Only (Conventional) −− Central
air conditioning only.
installer
set−up
options.
0180
Fan
Control
0 − Gas or Oil Heat −− Heating system
controls fan during heating demand.
Factory setting.
Available
only if
conven-
tional
system
chosen.
Settin
g
0180
Control
Heating
1 − Electric Heat −− Thermostat control fan
during heating demand.
Setting
defaults to
electric
heat if
heat
pump is
chosen.

Page 11
Installer
Set−Up
Number
Installer
Set−Up
Name
Selection Description
(Factory setting in bold print) Notes
0220
Cycles
per Hour
(cph) 1st
Stage
Compres-
sor
3 − Recommended setting for
compressors. Factory setting.
Settings of 1 − 6 cph available.
1 − Recommended for use with steam and
gravity.
Cycles
per Hour
(cph) 1st
3 − Recommended for use with hot water
heat and high−efficiency (90% or higher)
furnaces.
Shown
only when
0240
(cph)
1st
Stage
Conven-
tional
Hti
5 − Recommended for use with stan-
dard−efficiency (less than 90%) fossil
fuel furnaces. Factory setting.
y
conven-
tional sys-
tem is
selected
Heating 9 − Recommended for use with electric
furnaces.
selected
.
Settings of 1 − 12 cph available.
Continu-
0 − Backlight not lit continuously. Back-
light comes on when key is pressed.
Factory setting.
Option
always
shown;
however,
0280
Continu
ous
Backlight 1 − Backlight is continuously lit.
(Thermostat must be powered by 24V
common wire for this feature to be
allowed.)
however,
t’stat must
be pow-
ered by
24V com-
mon.
0300
Change-
0 − Manual changeover from heating
mode to cooling mode. Factory setting.
0300
Change
over 1 − Auto−changeover from heating mode to
cooling mode.
Deadband
2 − 2°F (1.5°C)
Option
Deadband
(Minimum
3 − 3°F (2°C). Factory setting.
O
pt
i
on
shown
(Mi
n
i
mum
differential
4 − 4°F (2.5°C)
shown
onl
y
when
0310
differential
between 5 − 5°F (3°C)
only
when
auto−
0310
between
heating 6 − 6°F (3.5°C)
auto
change-
h
heating
and
li
7 − 7°F (4°C)
g
over has
been
cooling
setpoints)
8 − 8°F (4.5°C) been
selected
setpoints) 9 − 9°F (5°C) se
l
ec
t
e
d
.
0320
Tempera-
ture Dis
0 − Fahrenheit (factory setting).
0320
t
ure
Di
s-
play Scale 1 − Celsius

Page 12
Installer
Set−Up
Number
Installer
Set−Up
Name
Selection Description
(Factory setting in bold print) Notes
Daylight
0 − Daylight savings disabled. Set to 0 in
areas that
do not
0330
D
ay
li
g
ht
Savings 1 − Daylight savings enabled.
Factory setting.
d
o no
t
follow
daylight
savings.
0 − No remote outdoor temperature
sensor. Factory setting.
Defaults
and
options
depend
on system
0340
Remote
Outdoor
Tempera-
ture Sen-
sor
1 − Outdoor temperature sensor used for
display only.
on
system
type
selection.
When set-
ting 0210
is set to 0,
so
2 − Outdoor temperature sensor used to
control heat pump lock−out settings.
is
set
to
0
,
setting
defaults to
2 and
item is not
shown.
0 − Filter change reminder off.
Factory setting.
1 − 10 run time days.
0500
Filter
Ch
2 − 30 run time days. Run time
based on
0500 Change
Reminder
3 − 60 run time days.
based
on
call for
f
Reminder
4 − 90 run time days. fan.
5 − 120 run time days.
6 − 365 run time days.
Humidifier
Pad
0 − Humidifier pad replacement remind-
er off. Factory setting.
0510
Pad
Re
p
lace- 1 − 90 run time days.
0510
Replace
ment Re-
minder
2 − 180 run time days.
m
i
n
d
er 3 − 365 run time days.
0520
UV Lamp
Replace-
ment Re
0 − UV lamp replacement reminder off.
Factory setting.
0520
men
t
R
e-
minder 1 − 365 run time days.

Page 13
Installer
Set−Up
Number
Installer
Set−Up
Name
Selection Description
(Factory setting in bold print) Notes
Adaptive
0 − Conventional Recovery −− System
starts recovery at programmed time.
0530
Ad
apt
i
ve
Intelligent
Recovery
1 − Adaptive Intelligent Recovery −− Sys-
tem starts recovery early so that set-
point is reached by the start of the pro-
gram period. Factory setting.
0540
Number
2 − Two periods (wake and sleep) avail-
able.
Shown
only when
program-
mable is
chosen
0540
Number
of Periods
4 − Four periods (wake, leave, return,
sleep) available. Factory setting.
chosen
.
Setting
applies to
all days of
the week.
0580
Minimum
Compres-
sor− Off
Time
Settings of 0 − 5 available.
5 − Five−minute compressor−off time
setting. Factory setting.
0600
Heat
Tempera-
ture
Range(°F)
Settings of 40 − 90 available in 1°F incre-
ments.
Factory setting = 90.
Shown in
1/2°C
increments
0610
Cool
Tempera-
ture
Range
(°F)
Settings of 50 − 99 available in 1°F incre-
ments.
Factory setting = 50.
Shown in
1/2°C
increments
0640
Clock 12 − 12−hour clock. Factory setting.
0640
Clock
Format 24 − 24−hour clock.
0650
Heating
Mode
Extended
0 − No extended fan operation after
heating demand satisfied.
Factory setting.
Not
shown
when fan
operation
is set to
0650
Extended
Fan On
Time 90 − Fan operation continues for 90 sec-
onds after heating demand satisfied.
is
set
to
fossil fuel
or in cool
only sys-
tems.
0660
Cooling
Mode
Extended
0 − No extended fan operation after
cooling demand satisfied.
Factory setting.
Not
shown in
heat only
0660
Extended
Fan On
Time 90 − Fan operation continues for 90 sec-
onds after cooling demand satisfied.
h
ea
t
on
l
y
systems.

Page 14
Installer
Set−Up
Number
Installer
Set−Up
Name
Selection Description
(Factory setting in bold print) Notes
0 − Keypad unlocked −− all functions are
available. Factory setting.
0670 Keypad
Lock−Out
1 − Keypad partially locked −− only temp. up
and down keys and ability to enter installer
set−up mode and modify set−up selections
are enabled.
2 − Keypad fully locked −− only ability to en-
ter installer set−up mode and modify set−up
selections are enabled.
Heating
Md
1 − Less aggressive control. Select this
setting if temperature is overshooting the
setpoint. Heating may turn off before the
setpoint is reached.
Applies to
recovery
ramp and
f
0680
g
Mode
Temp.
2 − Standard control. Factory setting.
p
use of
auxiliary
Temp
.
Control 3 − More aggressive control. Select this
setting if temperature is undershooting the
setpoint. Heating may remain on after the
setpoint is reached.
auxiliary
heat
during
recovery.
Cooling
Md
1 − Less aggressive control. (Cooling may
turn off before setpoint reached).
Applies to
0690
g
Mode
Temp.
2 − Standard control. Factory setting.
Applies
to
recovery
Temp
.
Control 3 − More aggressive control. (Cooling may
remain on after setpoint reached).
y
ramp.
−3°F (−1.5°C).
−2°F (−1°C).
−1°F (−.5°C).
0700
Temp.
Display
Offset
0 − No difference in displayed tempera-
ture and actual room temperature.
Factory setting.
1°F (.5°C).
2°F (1.5°C).
3°F (2°C).
Reset
0 − No thermostat reset. Factory setting. Only
calendar
0710
R
ese
t
Thermo-
stat
1 − Resets all installer set−up options to
default values and resets schedule to de-
fault setting.
calendar
settings
and time
are re-
tained.

Page 15
System Test
The system test function allows the in-
staller to check the HVAC system after
the thermostat set−up has been com-
pleted. The system test function is ac-
cessed through the installer set−up
menu.
1 − Press and release the SYSTEM
key.
2 − Press and hold the two blank keys
on either side of the center blank
key for approximately five seconds,
until the screen changes.
3 − Use the down arrow in the center of
the thermostat to reach the installer
test selections.
4 − The installer test number is dis-
played on the left−hand side of the
screen. The factory setting for the
test screen is displayed on the
right−hand side of the screen. Use
the up and down arrows on the
right−hand side of the thermostat to
select the desired test option.
5 − Refer to the following table to select
proper test options.
CAUTION − While the system is in
the test mode, the compressor mini-
mum off time is bypassed.
Installer
Test
Number
Installer
Set−Up
Name
Selection Description
Test 1
Installer Test 0 − Cooling is off (factory setting).
T
es
t
1
Installer
Test
Cool 1 − Cooling is activated.
Test 2
Installer Test 0 − Fan is off (factory setting).
T
es
t
2
Installer
Test
Fan 1 − Fan is activated.
Test 3
Installer Test 0 − Heating is off (factory setting).
T
es
t
3
Installer
Test
Heat 1 − Heat is activated.

Page 16
Troubleshooting
Symptom Possible Cause Action
Display does not come Thermostat is not being
Check to see that there
is 24V between R and C
terminals.
Display
does
not
come
on.
Thermostat
is
not
being
powered. Check to see that
batteries are properly
installed.
Check temperature
setpoints.
Temperature settings do
not change.
Upper or lower tempera-
ture limits were reached. Check installer set−up
numbers 0600 and
0610. Modify, if neces-
sary.
g
Keypad is fully locked.
Check installer set−up
numbers 0670 and
change keypad lock
option, if necessary.
Thermostat minimum−off
time is activated.
Wait up to 5 minutes for
the system to respond.
Heating or cooling does
not come on.
System selection has
not been set to heat or
cool.
Select proper system
mode.
not
come
on
.
System type selection is
incorrect.
Check installer set−up
number 0170 and make
sure proper system type
is selected.
Check wiring.
Thermostat is calling for
heat (Heat ON) or cool
(Cool ON); but HVAC
ti t ti
Heating or cooling
equipment is not
operating.
Check installer set−up
number 0170 and make
sure proper system type
is selected.
()
system is not operating.
operating
.
Verify operation of
equipment in system
test mode.
Thermostat does not
respond when touch
screen is pressed.
Keypad is fully locked.
Check installer set−up
numbers 0670 and
change keypad lock op-
tion, if necessary.
NOTE − Perform installer system tests (page 15) to verify thermostat control
of HVAC system.