Lennox LMO12CI-100V232-X User manual

Split Air Conditioner
Thank you for selecting LENNOX air conditioners.Please read this manual
carefully before operation and keep it for further reference.
OWNER'S MANUAL
LENNOX AIR CONDITIONERS
MODEL: LMO12CI-100V232-X
LMO12CO-100V232-X
LMO12HI-100V232-X
LMO12HO-100V232-X

This appliance is not intended for use by persons (including children) with reduced physical, sensory
or mental capabilities or lack of experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure they are away from the appliance.
R410A(R32/125: 50/50): 1975
Content
Operation Notices
Precautions............................................................................................................1
Parts Name........................................................................................................... .6
Screen Operation Guide
Buttons on remote controller..................................................................................7
Introduction for icons on display screen.................................................................7
Introduction for buttons on remote controller.........................................................8
Introduction for simple operation and other function......................................................12
Replacement of batteries in remote controller......................................................11
Emergency operation............................................................................................13
Clean and Maintenance........................................................................................13
Malfunction
Malfunction analysis.............................................................................................16
Installation Notice
Installation dimension diagram............................................................................20
Tools for installation.............................................................................................21
Selection of installation location ..........................................................................21
Requirements for electric connection ..................................................................22
Installation
Installation of indoor unit......................................................................................23
Installation of outdoor unit ...................................................................................28
Vacuum pumping.................................................................................................31
Leakage detection...............................................................................................31
Check after installation ........................................................................................32
Test and operation
Test operation......................................................................................................32
Attachment
Pipe expanding method........................................................................................33
Configuration of connection pipe..........................................................................33

1
Precautions
Warning
Do not connect air conditioner to multi-purpose socket.
This appliance can be used by children aged from 8
Operation and Maintenance
If the supply cord is damaged, it must be replaced by
the manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
Do not spray water on indoor unit. It may cause electric
shock or malfunction.
Otherwise, it may cause fire hazard.
Children shall not play with the appliance.
Cleaning and user maintenance shall not be made by
children without supervision.
years and above and persons with reduced physical,
sensory ormental capabilities or lack of experience and
knowledge if they have been given supervision or
instruction concerning use of the appliance in a safe
way and understand the hazards involved.
Do not wash the air conditioner with water to avoid
electric shock.
After removing the filter, do not touch fins to avoid injury.
Do not use fire or hair dryer to dry the filter to avoid
deformation or fire hazard.
Do disconnect power supply when cleaning air
conditioner. Otherwise, it may cause electric shock.
.

Do not block air outlet or air inlet. It may cause
malfunction.
remote controller may be broken.
●Power cord is overheating or damaged.
●There’s abnormal sound during operation.
●Circuit break trips off frequently.
●Air conditioner gives off burning smell.
●Indoor unit is leaking.
contact the dealer or qualified professionals for service.
When turning on or turning off the unit by emergency
operation switch, please press this switch with an insulating
object other than metal.
outlet. It may cause personal injury or damage.
2
Precautions
Warning
conditioner and disconnect power immediately，and then
If the air conditioner operates under abnormal conditions,
it may cause malfunction，electric shock or fire hazard.
Do not spill water on the remote controller, otherwise the
electric shock or damage. Please contact dealer when
you need to repair air conditioner.
Do not repair air conditioner by yourself. It may cause
objects. It may cause damage or personal injury.
Do not step on top panel of outdoor unit, or put heavy
When below phenomenon occurs, please turn off air
Do not extend fingers or objects into air inlet or air
Maintenance must be performed by qualified
professionals. Otherwise, it may cause personal injury
or damage.

Do install the circuit break. If not, it may cause malfunction.
of at least 3mm in all poles should be connected in fixed
wiring.
magnet buckle and heating buckle function, it can protect
the circuit-short and overload.
power supply circuit and circuit break.
3
Precautions
Warning
note the following table.Air switch should be included
Make sure the power supply matches with the
requirement of air conditioner.Unstable power supply or
incorrect wiring or malfunction. Please install proper power
supply cables before using the air conditioner.
An all-pole disconnection switch having a contact separation
Must follow the electric safety regulations when installing
the unit.
grounding wire of power socket.
Properly connect the live wire, neutral wire and
any work related to electricity and safety.
Be sure to cut off the power supply before proceeding
Including an circuit break with suitable capacity, please
Air Conditioner should be properly grounded. Incorrect
Don't use unqualified power cord.
grounding may cause electric shock.
According to the local safety regulations, use qualified
Installation must be performed by qualified professionals.
Otherwise, it may cause personal injury or damage.
Attachment

Installation must be performed in accordance with the
persons in order to avoid a hazard.
must be properly grounding with specialized grounding
device by a professional. Please make sure it is always
grounded effectively, otherwise it may cause electric shock.
The appliance must be positioned so that the plug is
accessible.
If the length of power connection wire is insufficient，please
contact the supplier for a new one. Avoid extending the
wire by yourself.
All wires of indoor unit and outdoor unit should be
connected by a professional.
national wiring regulations.
requirement of NEC and CEC by authorized personnel
only．
4
Precautions
Warning
wire, which can't be used for other purposes.
The grounding resistance should comply with national
electric safety regulations.
The air conditioner is the first class electric appliance. It
keep the interconnection cable away from the copper
tube.
The temperature of refrigerant circuit will be high, please
the manufacturer, its service agent or similarly qualified
If the supply cord is damaged, it must be replaced by
The yellow-green wire in air conditioner is grounding
The appliance shall be installed in accordance with
Do not put through the power before finishing installation.

The indoor unit should be installed close to the wall．
reachable after finishing installation.
far away from animals or plants.If it is unavoidable,
please add the fence for safety purpose.
5
Precautions
Warning
place, only the qualified person can perform the work.
Otherwise, it may cause personal injury or damage.
If you need to relocate the air conditioner to another
must be installed in the line.
For the air conditioner without plug, an circuit break
Select a location which is out of reach for children and
For the air conditioner with plug ，the plug should be
Working temperature range
Indoor side DB/WB(℃) Outdoor side DB/WB(℃)
Maximum cooling 32/23 43/26
Maximum heating 27/- 24/18
●The operating temperature range (outdoor temperature) for cooling only unit is
18℃~43℃; for heat pump unit is -7
℃~ 43℃.

6
(Display content or position may be different from above
graphics, please refer to actual products)
Parts Name
Indoor Unit
Outdoor Unit
air inlet
panel
aux.button
horizontal louver
air outlet
heating
indicator temp. indicator
cooling
indicator power indicator receiver window
drying
indicator
display
remote controller
Notice:
Actual product may be different from above graphics, please refer to actual
products.
air inlet
air outlet
Connection wire

7
Buttons on remote controller
Introduction for icons on display screen
1
14
3
1
13
2
2
5
4
6
7
8
11
12
13
9
14
15
ON/OFF button
▲ button
3
FAN button
SWING button
TIMER OFF button
TURBO button
10
TEMP button
I FEEL button
button
CLOCK button
TIMER ON button
SLEEP button
Send signal
Turbo mode
8℃heating function
Set temperature
Set time
TIMER ON /
TIMER OFF
Child lock
Up & down swing
Set fan speed
ventilation operation
Light
Temp. display type
:Set temp.
:Outdoor ambient temp. :Indoor ambient temp.
Sleep mode
Clock
Heat mode
Fan mode
Dry mode
Cool mode
Auto mode
Operation mode
I feel
6
9
8
12
15
4
7
10
5
11
X-FAN button
/
MODE button
▲
button
X-fan mode
health function

8
Introduction for buttons on remote controller
Note:
●After putting through the power, the air conditioner will give out a sound.
Operation indictor " " is ON (red indicator). After that, you can operate the air
conditioner by using remote controller.
● Under on status, pressing the button on the remote controller, the signal icon " "
on the display of remote controller will blink once and the air conditioner will give
out a “de” sound, which means the signal has been sent to the air conditioner.
● Under off status, set temperature and clock icon will be displayed on the display
of remote controller (If timer on, timer off and light functions are set, the corre-
sponding icons will be displayed on the display of remote controller at the same
time); Under on status, the display will show the corresponding set function icons.
ON/OFF button
▲ button
1
2
Press this button to turn on the unit. Press this button again to turn off the unit.
Press this button to increase set temperature. Holding it down above 2 seconds rapidly
increases set temperature. In AUTO mode, set temperature is not adjustable.
MODE button
3
Each time you press this button,a mode is selected in a sequence that goes from
AUTO, COOL, DRY, FAN, and HEAT *, as the following:
SWING button
4
Press this button to set up & down swing angle, which circularly changes as below:
button
5
Press this button to decrease set temperature. Holding it down above 2 seconds rapidly
decreases set temperature. In AUTO mode, set temperature is not adjustable.
After energization, AUTO mode is defaulted. In AUTO mode, the set temperature will
not be displayed on the LCD, and the unit will automatically select the suitable opera-
tion mode in accordance with the room temperature to make indoor room comfortable.
▲
AUTO COOL DRY FAN HEAT** Note: Only for models with heating function.
OFF
This remote controller is universal. If any command , or is sent out,
the unit will carry out the command as
indicates the guide louver swings as:

9
Introduction for buttons on remote controller
FAN button
6
CLOCK button
8
This button is used for setting Fan Speed in the sequence that goes from AUTO,
TIMER OFF button
7
Press this button to initiate the auto-off timer. To cancel the auto-timer program, simply
press the button again. TIMER OFF setting is the same as TIMER ON.
Press CLOCK button, blinking. Within 5 seconds, pressing ▲ or button adjusts the
SLEEP button
10
Press this button to go into the SLEEP operation mode. Press it again to cancel this
function. This function is available in COOL, HEAT (Only for models with heating
function) to maintain the most comfortable temperature for you.
TEMP button
11
Press this button, you can see indoor set temperature, indoor ambient temperature
on indoor unit’s display. The setting on remote controller is selected circularly as below:
When selecting " " with remote controller or no display, temperature indicator on indoor
TIMER ON button
9
Press this button to initiate the auto-ON timer. To cancel the auto-timer program, simply
press this button again.
After press of this button, disappears and "ON "blinks. 0 0:00 is displayed for ON time
setting. Within 5 seconds, press ▲ or button to adjust the time value. Every press of
either button changes the time setting by 1 minute. Holding down either button rapidly
changes the time setting by 1 minute and then 10 minutes. Within 5 Seconds after
setting, press TIMER ON button to confirm.
present time. Holding down either button above 2 seconds increases or decreases the
time by 1 minute every 0.5 second and then by 10 minutes every 0.5 second. During
blinking after setting, press CLOCK button again to confirm the setting, and then
will be constantly displayed.
, to , then back to Auto.
Auto
Low speed Medium speed High speed
no display
▲
▲

10
Introduction for buttons on remote controller
TURBO button
12
unit displays set temperature; When selecting " " with remote controller, temperature
indicator on indoor unit displays indoor ambient temperature; 3s later or within 3s it
receives other remote controller signal that will return to display the setting temperature.
Press this button to activate / deactivate the Turbo function which enables the unit to
13
X-FAN function: In COOL or DRY mode, the icon is displayed and the indoor fan will
continue operation for 2 minutes in order to dry the indoor unit even though you have
turned off the unit. After energization, X-FAN OFF is defaulted. X-FAN is not available in
AUTO, FAN or HEAT mode.
light. If the light is turned on, is displayed. If the light is turned off, disappears.
function: turn on the display's light and press this button again to turn off the display's
reach the preset temperature in the shortest time. In COOL mode, the unit will blow
strong cooling air at super high fan speed. In HEAT mode, the unit will blow strong
heating air at super high fan speed.
Caution:
This model hasn't outdoor ambient temperature display function. While remote controller
•
can operate " " and indoor unit displays set temperature.
It’s defaulted to display set temperature when turning on the unit.
•
Only for the models with temperature indicator on indoor unit.
•
X-FAN button
14
Press this button to turn on I FEEL function. The unit automatically adjust temperature
according to the sensed temperature. Press this button again to cancel I FEEL function.
I FEEL button
15
Press this button to achieve the on and off of healthy and scavenging functions in
operation status. Press this button for the first time to start scavenging function; LCD
displays " ". Press the button for the second time to start healthy and scavenging
functions simultaneously; LCD displays " " and " ". Press this button for the third
time to quit healthy and scavenging functions simultaneously. Press the button for the
fourth time to start healthy function; LCD display " ". Press this button again to repeat
the operation above. (This function is applicable to partial of models)
button
/

11
Function introduction for combination buttons
Combination of "▲" and " " buttons: About lock
Press "▲" and " " buttons simultaneously to lock or unlock the keypad. If the remote
Combination of "MODE" and " " buttons:
About switch between Fahrenheit and centigrade
At unit OFF, press "MODE" and " " buttons simultaneously to switch between ℃ and ℉.
Nixie tube on the remote controller displays " SE " . Repeat the operation to quit the function.
controller is locked, is displayed. In this case, pressing any button, blinks
three times.
▲
▲
Combination of "TEMP" and "CLOCK" buttons:
About Energy-saving Function
Press "TEMP" and "CLOCK" simultaneously in COOL mode to start energy-saving function.
Nixie tube on the remote controller displays " " and a selected temperature of " 8℃ " .
(46℉ if Fahrenheit is adopted). Repeat the operation to quit the function.
Combination of "TEMP" and "CLOCK" buttons:
About 8
℃ Heating Function
Press "TEMP" and "CLOCK" simultaneously in HEAT mode to start 8 ℃ Heating Function
▲
▲
About Back-lighting Function
The unit lights for 4s when energizing for the first time, and 3s for later press.

12
1. After putting through the power, press "ON/OFF" button on remote controller to
turn on the air conditioner.
2. Press "MODE" button to select your required mode: AUTO, COOL, DRY, FAN,
HEAT.
3. Press "▲" or " " button to set your required temperature. (Temperature can’t
be adjusted under auto mode).
4. Press "FAN" button to set your required fan speed: auto, low, medium and high
speed.
5. Press "SWING" button to select fan blowing angle.
Operation guide
▲
Replacement of batteries in remote controller
1. Press the back side of remote controller marked
the cover of battery box along the arrow direction.
2. Replace two 7# (AAA 1.5V) dry batteries, and
make sure the position of "▲" polar and " " polar
are correct.
3. Reinstall the cover of battery box.
Note:
● During operation, point the remote control signal sender at the receiving
window on indoor unit.
●The distance between signal sender and receiving window should be no
more than 8m, and there should be no obstacles between them.
or wireless telephone; remote controller should be close to indoor unit during
operation.
● Replace new batteries of the same model when replacement is required.
● When you don’t use remote controller for a long time, please take out the
batteries.
● If the display on remote controller is fuzzy or there’s no display, please
replace batteries.
▲
battery
Cover of battery box
remove
reinstall

13
Emergency operation
If remote controller is lost or damaged, please use auxiliary button to turn
on or turn off the air conditioner. The operation in details are as below:
As shown in the g. Open panel, press aux. button to turn on or turn off the
air conditioner. When the air conditioner is turned on, it will operate under
auto mode.
aux. button
panel
Clean and Maintenance
Note:
■ Turn off the air conditioner and disconnect the power before cleaning the air
conditioner to avoid electric shock.
■ Do not wash the air conditioner with water to avoid electric shock.
■ Do not use volatile liquid to clean the air conditioner.
Clean surface of indoor unit
When the surface of indoor unit is dirty, it is recommended to use a soft dry cloth
or wet cloth to wipe it.
Note:
● Do not remove the panel when cleaning it.

14
Clean and Maintenance
Clean lter
1
2
3
4
Open panel
Remove lter
Clean lter
Install lter
Pull out the panel to a certain
angle as shown in the g.
Remove the lter as in-
dicated in the g.
● Use dust catcher or water to
clean the lter.
● When the lter is very dirty, use
the water (below 45℃) to clean
it, and then put it in a shady
and cool place to dry.
Install the lter and then close the
panel cover tightly.
Note:
■ The lter should be cleaned every three months. If there is much dust in the
operation environment, clean frequency can be increased.
■ After removing the lter, do not touch ns to avoid injury.
■ Do not use re or hair dryer to dry the lter to avoid deformation or re hazard.

15
Clean and Maintenance
Checking before use-season
Checking after use-season
1. Check whether air inlets and air outlets are blocked.
2. Check whether circuit break, plug and socket are in good condition.
3. Check whether lter is clean.
4. Check whether mounting bracket for outdoor unit is damaged or corroded.
If yes, please contact dealer.
5. Check whether drainage pipe is damaged.
1. Disconnect power supply.
2. Clean lter and indoor unit’s panel.
3. Check whether mounting bracket for outdoor unit is damaged or corroded.
If yes, please contact dealer.
Notice for recovery
1. Many packing materials are recyclable materials.
Please dispose them in appropriate recycling unit.
2. If you want to dispose the air conditioner, please contact local dealer or
consultant service center for the correct disposal method.

16
Malfunction analysis
General phenomenon analysis
Please check below items before asking for maintenance. If the malfunction still
can’t be eliminated, please contact local dealer or qualied professionals.
Phenomenon Check items Solution
Indoor unit
can’t receive
remote
controller’s
signal or
remote
controller
has no
action.
● Whether it's interfered severely
(such as static electricity, stable
voltage)?
● Whether remote controller is
within the signal receiving
range?
● Whether there are obstacles?
● Whether remote controller is
pointing at the receiving
window?
● Is sensitivity of remote contro-
ller low; fuzzy display and no
display?
● No display when operating
remote controller?
● Fluorescent lamp in room?
● Pull out the plug. Reinsert
the plug after about 3min, and
then turn on the unit again.
● Signal receiving range is 8m.
● Remove obstacles.
● Select proper angle and point
the remote controller at the re-
ceiving window on indoor unit.
● Check the batteries. If the
power of batteries is too low,
please replace them.
● Take the remote controller
close to indoor unit.
● Turn off the uoresent lamp
and then try it again.
● Check whether remote cont-
roller appears to be damaged.
If yes, replace it.
No air
emitted
from
indoor
unit
● Air inlet or air outlet of indoor
unit is blocked? ● Eliminate obstacles.
● Under heating mode, indoor
temperature is reached to set
temperature?
● After reaching to set temper-
ature, indoor unit will stop bl-
owing out air.
● Heating mode is turned on just
now? ● In order to prevent blowing out cold air, indoor unit will be
started after delaying for sev-
eral minutes, which is a nor-
mal phenomenon.

17
Malfunction analysis
● Power failure?
● Is plug loose?
● Circuit break trips off or fuse is
burnt out?
● Wiring has malfunction?
● Unit has restarted immediately
after stopping operation?
● Whether the function setting
for remote controller is
correct? ● Reset the function.
● Wait for 3min, and then turn
on the unit again.
● Ask professional to replace it.
● Ask professional to replace
circuit break or fuse.
● Reinsert the plug.
● Wait until power recovery.
Air condit-
ioner can’t
operate
Mist is em-
itted from
indoor unit’s
air outlet
● Indoor temperature and hum-
idity is high?
● Because indoor air is cooled
rapidly. After a while, indoor
temperature and humidity will
be decrease and mist will
disappear.
Phenomenon Check items Solution
Set temper-
ature can’t
be adjusted
● Unit is operating under auto
mode?
● Temperature can’t be adju-
sted under auto mode.
Please switch the operation
mode if you need to adjust
temperature.
● Your required temperature
exceeds the set temperature
range?
● Set temperature range:
16℃~30℃.
Cooling
(heating)
effect is
not good.
● Voltage is too low? ● Wait until the voltage
resumes normal.
● Filter is dirty? ● Clean the lter.
● Set temperature is in proper
range? ● Adjust temperature to proper
range.
● Door and window are open? ● Close door and window.