Carrier CS78421-548-754 User manual

SPLIT-TYPE ROOM AIR CONDITIONER
CS78421-548-754
IMPORTANT NOTE:
Read this manual carefully before installing
or operating your new air conditioning
unit. Make sure to save this manual for
future reference.
Owner’s Manual

Safety Precautions.......................................................04
Unit Specifications and Features ..............................06
Table of Contents
Owner’s Manual
0
1
SAFETY
FIRST
Manual Operation
(Without Remote)................11
2

Care and Maintenance.....................................................12
Troubleshooting...................................................................14
3
4
European Disposal Guidelines....................................18
5

Page 4 
Safety Precautions
Read Safety Precautions Before Installation
The seriousness of potential damage or injuries is classified as either a WARNING or CAUTION.
WARNING
This symbol indicates that ignoring instructions may cause death or serious
Incorrect installation due to ignoring instructions can cause serious damage or injury.
injury.
This symbol indicates that ignoring instructions may cause moderate injury
to your person, or damage to your appliance or other property.
CAUTION
WARNING
This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental 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. Children shall not play with the appliance. Cleaning and user maintenance shall not be
made by children without supervision.
INSTALLATION WARNINGS
•
Ask an authorized dealer to install this air conditioner. Inappropriate installation may cause water
leakage, electric shock, or fire.
•
All repairs, maintenance and relocation of this unit must be performed by an authorized service
technician. Inappropriate repairs can lead to serious injury or product failure.
WARNINGS FOR PRODUCT USE
•
If an abnormal situation arises (like a burning smell), immediately turn off the unit and pull the
power plug. Call your dealer for instructions to avoid electric shock, fire or injury.
•
Do not
insert fingers, rods or other objects into the air inlet or outlet. This may cause injury, since
the fan may be rotating at high speeds.
•
Do not
use flammable sprays such as hair spray, lacquer or paint near the unit. This may cause
fire or combustion.
•
Do not
operate the air conditioner in places near or around combustible gases. Emitted gas may
collect around the unit and cause explosion.
•
Do not
operate the air conditioner in a wet room (e.g., bathroom or laundry room). This can
cause electrical shock and cause the product to deteriorate.
•
Do not
expose your body directly to cool air for a prolonged period of time.
Safety
Precautions

Safety
Precautions
Page 5 
ELECTRICAL WARNINGS
• Only use the specified power cord. If the power cord is damaged, it must be replaced by the
manufacturer or certified service agent.
• Keep power plug clean. Remove any dust or grime that accumulates on or around the plug. Dirty
plugs can cause fire or electric shock.
• Do not pull power cord to unplug unit. Hold the plug firmly and pull it from the outlet. Pulling
directly on the cord can damage it, which can lead to fire or electric shock.
• Do not use an extension cord, manually extend the power cord, or connect other appliances to
the same outlet as the air conditioner. Poor electrical connections, poor insulation, and insufficient
voltage can cause fire.
CLEANING AND MAINTENANCE WARNINGS
• Turn off the device and pull the plug before cleaning. Failure to do so can cause electrical shock.
• Do not clean the air conditioner with excessive amounts of water.
• Do not clean the air conditioner with combustible cleaning agents. Combustible cleaning agents
can cause fire or deformation.
CAUTION
• If the air conditioner is used together with burners or other heating devices, thoroughly ventilate
the room to avoid oxygen deficiency.
• Turn off the air conditioner and unplug the unit if you are not going to use it for a long time.
• Turn off and unplug the unit during storms.
• Make sure that water condensation can drain unhindered from the unit.
• Do not operate the air conditioner with wet hands. This may cause electric shock.
• Do not use device for any other purpose than its intended use.
• Do not climb onto or place objects on top of the outdoor unit.
• Do not allow the air conditioner to operate for long periods of time with doors or windows open,
or if the humidity is very high.

Page 6 
Unit Specifications and Features 1
Unit
Specifications
and Features
NOTE:
A guide on using the infrared remote is not included
in this literature package.
Unit Parts
fresh defrost run timer
Power Cable (Some Units)
Remote Control
Remote Holder
(Some Units)
Louver
Front Panel
Display window(A)
Display window(B)
“ ” for 3 seconds when:
• TIMER ON is set
• FRESH, SWING, TURBO, or SILENCE features are turned on
“ ” when Fresh feature is activated(some units)
“ ” for 3 seconds when:
• TIMER OFF is set
• FRESH, SWING, TURBO, or SILENCE features are turned off
“ ” when defrosting
“ ” when anti-cold air feature is turned on
“ ” when unit is self-cleaning
“ ” when freeze protection is turned on
“ ” when defrost feature is activated.
Display Code
Meanings
In Fan mode, the unit will display the room temperature.
In other modes, the unit will display your temperature setting.
,
,
“ ” Not available for all units.
When ECO function(some units) is activated, the
illuminates gradually one by one as --
-- --set temperature -- ...... in one second interval.
fresh defrost run timer
“ ” when the unit is on.
“ ” when TIMER is set.
When error occurs, it displays error code.
fresh
defrost
run
timer

Unit
Specifications
and Features
Page 7 
Achieving Optimal Performance
Optimal performance for the COOL, HEAT, and DRY modes can be achieved in the following
temperature ranges. When your air conditioner is used outside of these ranges, certain safety
protection features will activate and cause the unit to perform less than optimally.
Room
Temperature 17°-32°C (63°-90°F) 0°-30°C (32°-86°F) 10°-32°C (50°-90°F)
Outdoor
Temperature
18°-43°C (64°-109°F)
-7°-24°C (19°-75°F)
11°-43°C (52°-109°F)
-7°-43°C (19°-109°F)
(For models with low-temp cooling systems) 18°-43°C (64°-109°F)
18°-54°C (64°-129°F)
(For special tropical models) 18°-54°C (64°-129°F) (For special tropical models)
COOL mode HEAT mode DRY mode
COOL mode HEAT mode DRY mode
Room Temperature 17°C - 32°C
(63°F - 90°F)
0°C - 30°C
(32°F - 86°F)
10°C - 32°C
(50°F - 90°F)
Outdoor
Temperature
0°C - 50°C
(32°F - 122°F)
-15°C - 30°C
(5°F - 86°F)
0°C - 50°C
(32°F - 122°F)
0°C - 60°C
(32°F - 140°F)
(For special
tropical models)
0°C - 60°C
(32°F - 140°F)
(For special
tropical models)
-15°C - 50°C
(5°F - 122°F)
(For models with
low temp. cooling
systems.)
To further optimize the performance of your unit, do the following:
• Keep doors and windows closed.
• Limit energy usage by using TIMER ON and TIMER OFF functions.
• Do not block air inlets or outlets.
• Regularly inspect and clean air filters.
FOR OUTDOOR UNITS
WITH AUXILIARY
ELECTRIC HEATER
Inverter Split Type
Fixed-speed Type
When outside
temperature is below 0°C
(32°F ), we strongly
recommend keeping the
unit plugged in at all
time to ensure smooth
ongoing performance.

Unit
Specifications
and Features
Page 8 
For a detailed explanation of each function,
refer to the Remote Control Manual.
Other Features
•
•
Auto-Restart
If the unit loses power, it will automatically
restart with the prior settings once power has
been restored.
• Anti-mildew (some units)
When turning off the unit from COOL, AUTO
(COOL), or DRY modes, the air conditioner will
continue operate at very low power to dry up
condensed water and prevent mildew growth.
• Wi-Fi Control (some units)
Wi-Fi control allows you to control your air
conditioner using your mobile phone and a
Wi-Fi connection.
• Louver Angle Memory(some units)
When turning on your unit, the louver will
automatically resume its former angle.
• Refrigerant Leakage Detection (some
units)
The indoor unit will automatically display “EC”
For a detailed explanation of your unit’s
advanced functionality (such as TURBO
mode and its self-cleaning functions),
refer to the Remote Control Manual.
Air Filter Reminders (some units)
The “timer” indicator light turns off and
the “run” indicator light flashes 7 times
when the unit detects refrigerant leakage.
Air Filter Cleaning Reminder
Air Filter Replacement Reminder
After 240 hours of use, the “run” &
“timer” indicator lamps on the indoor
unit will flash simultaneously and the
display window on the indoor unit will
flash “CL” (if applicable). This is a
reminder to clean your filter. After 15
seconds, the unit will revert to its
previous display.
To reset the reminder, press the LED
button on your remote control 4 times,
or press the MANUAL CONTROL botton
3 times. If you don’t reset the reminder,
the “CL”, “run” & “timer” indicator
lamps will flash again when you restart
the unit.
After 2,880 hours of use, the “run” &
“timer” indicator lamps will flash
simultaneously for 10 times, then
remain on for five seconds,and the
display window on the indoor unit will
flash “nF”(if applicable). This is a reminder
to replace your filter. After that, the unit
will revert to its previous display.
To reset the reminder, press the LED
button on
your remote control 4 times,
or press the
MANUAL CONTROL botton
3 times. If you don’t reset the reminder,
the “nF”, “run” & “timer” indicator
lamps will flash again when you restart
the unit.

Page 9 
Setting vertical angle of air flow
While the unit is on, use the SWING/DIRECT
button to set the direction (vertical angle) of
airflow.
1. Press the SWING/DIRECT button once to
activate the louver. Each time you press
the button, it will adjust the louver by 6°.
Press the button until the direction you
prefer is reached.
2. To make the louver swing up and down
continuously, press and hold the SWING/
DIRECT button for 3 seconds. Press it
again to stop the automatic function.
The horizontal angle of the airflow must be set
manually. Grip the deflector rod (See Fig.B)
and manually adjust it to your preferred direction.
For some units, the horizontal angle of the airflow
can be set by remote control. please refer to the
Remote Control Manual.
NOTE ON LOUVER ANGLES
When using COOL or DRY mode, do not set
louver at too vertical an angle for long periods
of time. This can cause water to condense on
the louver blade, which will drop on your floor
or furnishings. (See Fig.A)
When using COOL or HEAT mode, setting the
louver at too vertical an angle can reduce the
performance of the unit due to restricted air
flow.
Do not move louver by hand. This will cause the
louver to become out of sync. If this occurs, turn
off the unit and unplug it for a few seconds,
then restart the unit. This will reset the louver.
Fig. A
CAUTION
Do not put your fingers in or near the blower
and suction side of the unit. The high-speed
fan inside the unit may cause injury.
Fig. B
Setting Angle of Air Flow
Setting horizontal angle of air flow
•
Unit
Specifications
and Features
Range
Caution: Do not keep louver at too
vertical an angle for long periods of
time. This can cause water condensation
to drip on your furnishings.
Deflector rod

Page 10 
The SLEEP function is used to decrease energy
use while you sleep (and don’t need the same
temperature settings to stay comfortable). This
function can only be activated via remote control.
Press the SLEEP button when you are ready to
go to sleep. When in COOL mode, the unit will
increase the temperature by 1°C (2°F) after 1
hour, and will increase an additional 1°C (2°F)
after another hour. When in HEAT mode, the unit
will decrease the temperature by 1°C (2°F) after
1 hour, and will decrease an additional 1°C (2°F)
after another hour.
It will hold the new temperature for 5 hours, then
the unit will turn off automatically.
Note:The SLEEP function is not available in
FAN or DRY mode.
Sleep Operation
Set
temperature
Saving energy during sleep
1hr 1hr
7 hours
timer o
+/- 1 C/2 F
SLEEP Operation
+/- 1 C/2 F
•
Unit
Specifications
and Features

Page 11 
How to operate your unit without
the remote control
In the event that your remote control fails to
work, your unit can be operated manually with
the MANUAL CONTROL button located on
the indoor unit. Note that manual operation is
not a long-term solution, and that operating
the unit with your remote control is strongly
recommended.
BEFORE MANUAL OPERATION
Unit must be turned off before manual
operation.
To operate your unit manually:
1. Open the front panel of the indoor unit.
2. Locate the MANUAL CONTROL button on
the right-hand side of the unit.
3. Press the MANUAL CONTROL button one
time to activate FORCED AUTO mode.
4. Press the MANUAL CONTROL button again
to activate FORCED COOLING mode.
5. Press the MANUAL CONTROL button a third
time to turn the unit off.
6. Close the front panel.
Manual Operation (Without Remote) 2
CAUTION
The manual button is intended for testing
purposes and emergency operation only. Please
do not use this function unless the remote is
lost and it is absolutely necessary. To restore
regular operation, use the remote control to
activate the unit.
Manual Operation
(Without Remote)
Manual control button

Page 12 
Cleaning Your Indoor Unit
BEFORE CLEANING OR
MAINTENANCE
ALWAYS TURN OFF YOUR AIR CONDITIONER
SYSTEM AND DISCONNECT ITS POWER SUPPLY
BEFORE CLEANING OR MAINTENANCE.
CAUTION
Only use a soft, dry cloth to wipe the unit clean.
If the unit is especially dirty, you can use a cloth
soaked in warm water to wipe it clean.
• Do not use chemicals or chemically treated
cloths to clean the unit
• Do not use benzene, paint thinner,
polishing powder or other solvents to clean
the unit. They can cause the plastic surface
to crack or deform.
• Do not use water hotter than 40°C (104°F)
to clean the front panel. This can cause the
panel to deform or become discolored.
Cleaning Your Air Filter
A clogged air conditioner can reduce the cooling
efficiency of your unit, and can also be bad for
your health. Make sure to clean the filter once
every two weeks.
1. Lift the front panel of the indoor unit. The
air filter is under the top air inlet grill.
2. Grip the tab on the end of the filter, lift it
up, then
pull it towards yourself.
3. Now pull the filter out.
4. If your filter has a small air freshening filter,
unclip it from the larger filter. Clean this air
freshening filter with a hand-held vacuum.
5. Clean the large air filter with warm, soapy
water. Be sure to use a mild detergent.
Care and Maintenance 3
6. Rinse the filter with fresh water, then shake
off excess water.
7. Dry it in a cool, dry place, and refrain from
exposing it to direct sunlight.
8. When dry, re-clip the air freshening filter to
the larger filter, then slide it back into the
indoor unit.
9. Close the front panel of the indoor unit.
CAUTION
Do not touch air freshening (Plasma) filter for
at least 10 minutes after turning off the unit.
Care and
Maintenance
Remove air freshening filter from back of
larger filter (some units)
Filter Tab

3
Page 13 
CAUTION
• Before changing the filter or cleaning,
turn off the unit and disconnect its power
supply.
• When removing filter, do not touch metal
parts in the unit. The sharp metal edges can
cut you.
• Do not use water to clean the inside of the
indoor unit. This can destroy insulation and
cause electrical shock.
• Do not expose filter to direct sunlight when
drying. This can shrink the filter.
Air Filter Reminders (Optional)
Air Filter Cleaning Reminder
After 240 hours of use, the display window on
the indoor unit will flash “CL.” This is a reminder
to clean your filter. After 15 seconds, the unit will
revert to its previous display.
To reset the reminder, press the LED button
on your remote control 4 times, or press the
MANUAL CONTROL button 3 times. If you don’t
reset the reminder, the “CL” indicator will flash
again when you restart the unit.
Air Filter Replacement Reminder
After 2,880 hours of use, the display window on
the indoor unit will flash “nF.” This is a reminder
to replace your filter. After 15 seconds, the unit
will revert to its previous display.
To reset the reminder, press the LED button
on your remote control 4 times, or press the
MANUAL CONTROL button 3 times. If you don’t
reset the reminder, the “nF” indicator will flash
again when you restart the unit.
CAUTION
• Any maintenance and cleaning of outdoor
unit should be performed by an authorized
dealer or licensed service provider.
• Any unit repairs should be performed
by authorized dealer or licensed servic
e
provider.
Maintenance –
Long Periods of Non-Use
If you plan not to use your air conditioner for an
extended period of time, do the following:
Clean all filters Turn on FAN function until
unit dries out completely
Turn off the unit and
disconnect the power
Remove batteries
from remote control
Maintenance –
Pre-Season Inspection
After long periods of non-use, or before periods
of frequent use, do the following:
Check for damaged wires Clean all filters
Check for leaks Replace batteries
Make sure nothing is blocking all air inlets and outlets
Care and
Maintenance

Page 14 
SAFETY PRECAUTIONS
If ANY of the following conditions occurs, turn off your unit immediately!
• The power cord is damaged or abnormally warm
• You smell a burning odor
• The unit emits loud or abnormal sounds
• A power fuse blows or the circuit breaker frequently trips
• Water or other objects fall into or out of the unit
DO NOT ATTEMPT TO FIX THESE YOURSELF! CONTACT AUTHORIZED SERVICE PROVIDER
IMMEDIATELY!
Common Issues
The following problems are not a malfunction and in most situations will not require repairs.
Issue Possible Causes
Unit does not turn
on when pressing
ON/OFF button
The Unit has a 3-minute protection feature that prevents the
unit from overloading. The unit cannot be restarted within
three minutes of being turned off.
The unit may change its setting to prevent frost from forming
on the unit. Once the temperature increases, the unit will start
operating in the previously selected mode again.
The set temperature has been reached, at which point the
unit turns off the compressor. The unit will continue operating
when the temperature fluctuates again.
The indoor unit
emits white mist
In humid regions, a large temperature difference between the
room’s air and the conditioned air can cause white mist.
Both the indoor
and outdoor units
emit white mist
When the unit restarts in HEAT mode after defrosting, white
mist may be emitted due to moisture generated from the
defrosting process.
Troubleshooting 4
Troubleshooting
The unit changes
from COOL/HEAT
mode to FAN
mode

4
Page 15 
Issue Possible Causes
The indoor unit
makes noises
A rushing air sound may occur when the louver resets its
position.
A squeaking sound may occur after running the unit in HEAT
mode due to expansion and contraction of the unit’s plastic
parts.
Both the indoor
unit and outdoor
unit make noises
Low hissing sound during operation: This is normal and is
caused by refrigerant gas flowing through both indoor and
outdoor units.
Low hissing sound when the system starts, has just stopped
running, or is defrosting: This noise is normal and is caused by
the refrigerant gas stopping or changing direction.
Squeaking sound: Normal expansion and contraction of
plastic and metal parts caused by temperature changes during
operation can cause squeaking noises.
The outdoor unit
makes noises
The unit will make different sounds based on its current
operating mode.
Dust is emitted
from either the
indoor or outdoor
unit
The unit may accumulate dust during extended periods of
non-use, which will be emitted when the unit is turned on.
This can be mitigated by covering the unit during long periods
of inactivity.
The unit emits a
bad odor
The unit may absorb odors from the environment (such as
furniture, cooking, cigarettes, etc.) which will be emitted
during operations.
The unit’s filters have become moldy and should be cleaned.
The fan of the
outdoor unit does
not operate
During operation, the fan speed is controlled to optimize
product operation.
Operation
is erratic,
unpredictable,
or unit is
unresponsive
Interference from cell phone towers and remote boosters may
cause the unit to malfunction.
In this case, try the following:
• Disconnect the power, then reconnect.
• Press ON/OFF button on remote control to restart operation.
NOTE: If problem persists, contact a local dealer or your nearest customer service
center. Provide them with a detailed description of the unit malfunction as
well as your model number.
Troubleshooting

Page 16 
Troubleshooting
When troubles occur, please check the following points before contacting a repair company.
Problem Possible Causes Solution
Poor Cooling
Performance
Temperature setting may
be higher than ambient
room temperature
Lower the temperature setting
The heat exchanger on the
indoor or outdoor unit is
dirty
Clean the affected heat exchanger
The air filter is dirty Remove the filter and clean it
according to instructions
The air inlet or outlet of
either unit is blocked
Turn the unit off, remove the
obstruction and turn it back on
Doors and windows are
open
Make sure that all doors and
windows are closed while
operating the unit
Excessive heat is generated
by sunlight
Close windows and curtains
during periods of high heat or
bright sunshine
Too many sources of heat
in the room (people,
computers, electronics,
etc.)
Reduce amount of heat sources
Low refrigerant due to leak
or long-term use
Check for leaks, re-seal if
necessary and top off refrigerant
SILENCE function is
activated(optional function)
SILENCE function can lower
product performance by reducing
operating frequency. Turn off
SILENCE function.
Troubleshooting

Page 17 
Problem Possible Causes Solution
The unit is not
working
Power failure Wait for the power to be
restored
The power is turned off Turn on the power
The fuse is burned out Replace the fuse
Remote control batteries are
dead
Replace batteries
The Unit’s 3-minute protection
has been activated
Wait three minutes after
restarting the unit
Timer is activated Turn timer off
The unit starts and
stops frequently
There’s too much or too little
refrigerant in the system
Check for leaks and
recharge the system with
refrigerant.
Incompressible gas or
moisture has entered the
system.
Evacuate and recharge the
system with refrigerant
The compressor is broken Replace the compressor
The voltage is too high or
too low
Install a manostat to
regulate the voltage
Poor heating
performance
The outdoor temperature is
exetremtly low
Use auxiliary heating
device
Cold air is entering through
doors and windows
Make sure that all doors
and windows are closed
during use
Low refrigerant due to leak or
long-term use
Check for leaks, re-seal
if necessary and top off
refrigerant
Indicator lamps
continue flashing The unit may stop operation or continue to run safely. If
the indicator lamps continue to flash or error codes appear,
wait for about 10 minutes. The problem may resolve itself.
If not, disconnect the power, then connect it again. Turn
the unit on.
If the problem persists, disconnect the power and contact
your nearest customer service center.
Error code appears in
the window display
of indoor unit:
• E0, E1, E2…
• P1, P2, P3…
• F1, F2, F3…
NOTE: If your problem persists after performing the checks and diagnostics above, turn off your
unit immediately and contact an authorized service center.
Troubleshooting

Page 18 
European Disposal Guidelines
This appliance contains refrigerant and other potentially hazardous materials. When disposing of
this appliance, the law requires special collection and treatment. Do not dispose of this product as
household waste or unsorted municipal waste.
When disposing of this appliance, you have the following options:
•Dispose of the appliance at designated municipal electronic waste collection facility.
•When buying a new appliance, the retailer will take back the old appliance free of charge.
•The manufacturer will take back the old appliance free of charge.
•Sell the appliance to certified scrap metal dealers.
Special notice
Disposing of this appliance in the forest or other natural surroundings endangers your health and is
bad for the environment. Hazardous substances may leak into the ground water and enter the food
chain.
Disposal
Information
5

The design and specifications are subject to change without prior notice for
product improvement. Consult with the sales agency or manufacturer for details.
CS372U-AF
16122000002735
20160607

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