Mars Comfort-Aire Century B-VMH24CU-1 User manual

OWNER’S MANUAL
Super-Slim Four-Way Cassette
Model
B-VMH24CU-1
517.787.2100 • www.marsdelivers.com

Owner’s Manual - B-VMH24CU-1
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Indoor Unit Parts and Major Functions .......... 6
Manual Operations............................................................... 8
Table of Contents
SAFETY
FIRST
4
1 Safety Precautions .................................................................
2
3

Owner’s Manual - B-VMH24CU-1
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Care and Maintenance .................................. 9
Unit Maintenance ............................................... 9
How to Clean the Air Filter ........................... 9
Repairing Refrigerant Leaks .......................... 10
Preparation for Periods of Non-use ................ 10
Troubleshooting .................................... 11
Common Problems ............................... 11
Troubleshooting Tips ............................ 12
4
5
WARNING: Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance
and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of the
person competent in the use of flammable refrigerants. For more details ,please refer to the Information on
servicing on INSTALLATION MANUAL .(This is only required for the unit adopts R32/R290 Refrigerant)
(for R32/R290 refrigerant only )
Caution : Risk of fire
Warranty .......................................................... 15

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Thank you for purchasing this air conditioner. This manual will provide you with information on how
to operate, maintain, and troubleshoot your air conditioner. Following the instructions will ensure the
proper function and extended lifespan of your unit.
Please pay attention to the following signs:
Safety Precautions 1
Failure to observe a warning may result in death. The appliance must be
installed in accordance with national regulations.
.
Failure to observe a caution may result in injury or equipment damage.
WARNING
CAUTION
WARNING
•Ask an authorized dealer to install this air
conditioner. Inappropriate installation may
cause water leakage, electric shock, or fire.
•The warranty will be voided if the unit is not
installed by professionals.
•If an abnormal situation arises (like burning
smell), turn off the power supply and call
your dealer for instructions to avoid electric
shock, fire or injury.
• DO NOT let the indoor unit or the remote
control get wet. It may cause electric shock
or fire.
• 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 a flammable spray such as hair
spray, lacquer or paint near the unit. This may
cause fire or combustion.
•Do not use means to accelerate the
defrosting process or to clean, other than
those recommended by the manufacturer.
•The appliance shall be stored in a room
without continuously operating ignition
sources (for example: open flames, an
operating gas appliance or an operating
electric heater).
•The appliance shall be stored so as to
prevent mechanical damage from occurring.
•Be aware that refrigerants may not
contain an odor.
•Compliance with national gas regulations
shall be observed.
•Keep ventilation openings clear of
obstruction.
•
DO NOT pierce or burn.
NOTE: The following information is required
for units using R32/R290 Refrigerant.
• A warning that the appliance shall be stored
in a well-ventilated area where the room size
corresponds to the room area as specied
for operation.
•Any person who is involved with working on
or breaking into a refrigerant circuit should
hold a current valid certicate from an
industry-accredited assessment authority,
which authorises their competence to handle
refrigerants safely in accordance with an
industry recognised assessment specication.
•
•
Servicing shall only be performed as
recommended by the equipment
manufacturer. Maintenance and repair
requiring the assistance of other skilled
personnel shall be carried out under the
supervision of the person competent in the
use of ammable refrigerants.
If the supply cord is damaged, it must be
replaced by the manufacturer, its service
agent or similarly qualied persons in order
to avoid a hazard.

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CAUTION
• DO NOT touch the air outlet while the
swing flap is in motion. Fingers might get
caught or the unit may break down.
• DO NOT inspect the unit by yourself. Ask an
authorized dealer to perform the inspection.
• To prevent product deterioration, do not use
the air conditioner for preservation purposes
(storage of food, plants, animals, works of art,
etc.).
• DO NOT touch the evaporator coils inside
the indoor unit. The evaporator coils are
sharp and may cause injury.
• DO NOT operate the air conditioner with
wet hands. It may cause electric shock.
• DO NOT place items that might be affected
by moisture damage under the indoor unit.
Condensation can occur at a relative
humidity of 80% or above.
• DO NOT expose heat-producing appliances
to cold air or place them under the indoor
unit. This may cause incomplete combustion
or deformation of the unit due to the heat.
• After long periods of usage, check the indoor
unit to see if anything is damaged. If the
indoor unit is damaged, it may fall and cause
injury.
• If the air conditioner is used together with
other heating devices, thoroughly ventilate
the room to avoid oxygen deficiency.
• DO NOT climb onto or place objects on top
of the outdoor unit.
• DO NOT operate the air conditioner when
using fumigant insecticides. The chemicals
may become layered with the unit and
endanger those who are hypersensitive to
chemicals.
• DO NOT let children play with the air
conditioner.
• 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.
•
•
•
•
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.
The appliance shall be installed in accordance
with national wiring regulations.
The indoor unit must be installed 8 feet
above floor.
An all-pole disconnection device which has at
least 3mm separation distance in all pole and
a residual current device (RCD) with the rating
of above 10mA shall be incorporated in the
fixed wiring according to national code.

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Indoor Unit Parts And Major Functions 2
Unit Parts
Air inlet
Display panel
Louver
Air outlet
Fig. 2.1
Operating Conditions
Use the system under the following temperatures for safe and eective operation. If the air
conditioner is used under dierent conditions, it may malfunction or become less ecient.
COOL mode HEAT mode DRY mode
Room Temperature 17°C - 32°C
(62°F - 90°F)
0°C - 30°C
(32°F - 86°F)
17°C - 32°C
(62°F - 90°F)
•Inverter Split Type

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Features
Default Setting
When the air conditioner restarts after a power
failure, it will default to the factory settings
(AUTO mode, AUTO fan, 24°C (76°F)). This
may cause inconsistencies on the remote
control and unit panel. Use your remote
control to update the status.
Auto-Restart (some models)
In case of power failure, the system will
immediately stop. When power returns, the
Operation light on the indoor unit will flash. To
restart the unit, press the ON/OFF button on
the remote control. If the system has an auto
restart function, the unit will restart using the
same settings.
Energy Saving Tips
•DO NOT set the unit to excessive temperature levels.
•While cooling, close the curtains to avoid direct sunlight.
•Doors and windows should be kept closed to keep cool or warm air in the room.
•DO NOT place objects near the air inlet and outlet of the unit. This will reduce the efficiency of
the unit.
•Set a timer and use the built-in SLEEP/ECONOMY mode if applicable.
•If you don’t plan to use the unit for a long time, remove the batteries from the remote control.
•Clean the air filter every two weeks. A dirty filter can reduce cooling or heating efficiency.
•Adjust louvers properly and avoid direct airflow.
Louver Angle Memory Function (Optional)
Some models are designed with a louver angle
memory function. When the unit restarts after a
power failure, the angle of the horizontal louvers
will automatically return to the previous position.
The angle of the horizontal louver should not be
set too small as condensation may form and drip
into the machine. To reset the louver, press the
manual button, which will reset the horizontal
louver settings.
Refrigerant Leak Detection System
(some models)
In the event of a refrigerant leak, the LCD screen
will display “EC” and the LED indicator light will
flash.
Closing curtains during heating also
helps keep the heat in Doors and windows should be kept closed

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Manual Operations 3
This display panel on the indoor unit can be used to operate the unit in case the remote control has
been misplaced or is out of batteries.
Manual button
Operation indicator
Timer indicator
LED display
PRE-DEF
(pre-heating/defrost)
indicator
PRE-DEF
(pre-heating/defrost)
indicator
Alarm indicator
Infrared receiver
Infrared receiver
Fig. 3.1
Fig. 3.2
•
MANUAL button: This button selects the mode in the following order: AUTO, FORCED COOL, OFF.
•FORCED COOL mode: In FORCED COOL mode, the Operation light flashes. The system will then
turn to AUTO after it has cooled with a high wind speed for 30 minutes. The remote control will
be disabled during this operation.
•OFF mode: When the panel is turned OFF, the unit turns o and the remote control is re-enabled.
Operation indicator
Timer indicator Alarm indicator
LED display
Manual button
FUNC
PRE-DEF
(pre-heating/defrost)
indicator

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1. Unlock the grille by pushing the two tabs
towards the middle simultaneously.
2. Unplug the display panel cable from the
control box on the main body.
Press tabs to
release grille
Fig. 4.1
3. Detach the grille from the main unit by
holding the grille at a 45° angle, lifting it up
slightly and then pulling the grille forward.
Safety Precautions
•Contact an authorized service technician for
repair or maintenance. Improper repair and
maintenance may cause water leakage,
electrical shock, or fire, and may void your
warranty.
•DO NOT substitute a blown fuse with a
higher or lower amperage rating fuse, as this
may cause circuit damage or an electrical fire.
•Make sure the drain hose is set up according
to the instructions. Failure to do so could
cause leakage and result in personal
property damage, fire and electric shock.
•Make sure that all wires are connected
properly. Failure to connect wires according
to instructions can result in electrical shock
or fire.
Unit Maintenance
BEFORE CLEANING OR
MAINTENANCE
•Always turn o your air conditioning system
and disconnect the power supply before
cleaning or maintenance.
•
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 wash the unit under running water.
Doing so causes an electrical hazard.
•
DO NOT use water hotter than 40°C (104°F)
to clean the front panel. This can cause the
panel to become deformed or discolored.
•Clean the unit using a damp, lint-free cloth
and neutral detergent. Dry the unit with a
dry, lint-free cloth.
How To Clean The Air Filter
The filter prevents dust and other particles from
entering the indoor unit. Dust buildup can reduce
the efficiency of the air conditioner. For optimum
efficiency, clean the air filter every two weeks or
more frequently if you live in a dusty area. Replace
the filter with a new one if it’s heavily clogged and
cannot be cleaned.
WARNING: DO NOT REMOVE OR
CLEAN THE FILTER BY YOURSELF
Removing and cleaning the filter can be
dangerous. Removal and maintenance must be
performed by a certified technician.
NOTE: In households with animals, you will
have to periodically wipe down the grille to
prevent animal hair blocking airow.
Care And Maintenance 4

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6. Rinse the lter with clean water and allow it
to air-dry.
DO NOT let the lter dry in direct
sunlight.
7. Reinstall the lter.
8. Reinstall the front grille and reconnect the
display panel cable to the control box on the
main body.
Repairing Refrigerant Leaks
WARNING
•If the refrigerant leaks, turn o the air
conditioner and any combustible heating
devices, ventilate the room and call your
dealer immediately. Refrigerant is both toxic
and flammable.
DO NOT use the air
conditioner until the leak is repaired.
•When the air conditioner is installed in a
small room, measures must be taken to
prevent the refrigerant concentration from
exceeding the safety limit in the event of
refrigerant leakage. Concentrated
refrigerant causes a severe health and safety
threat.
Refrigerant Leak Detection System
(some models)
•In the event of a refrigerant leak, the LCD
screen will display “EC” and the LED indicator
light will flash.
Preparation For Periods Of Non-Use
Maintenance after Extended Non-Use
1. Remove any obstacles blocking the vents of
both the indoor and outdoor units.
2. Clean the air lter and the front grille of the
indoor unit. Reinstall the clean, dry air lter in
its original position.
3. Turn on the main power switch at least 12
hours prior to operating the unit.
Storing the Unit While Not In Use
1. Run the appliance on FAN mode for 12 hours in
a warm room to dry it and prevent mold.
2. Turn off the appliance and disconnect power.
3. Clean the air filter according to the instructions
in the previous section. Reinstall the clean, dry
filter before storing.
4. Remove the batteries from the remote control.
NOTE: Some models include an auto-lifting
panel function, which allows the grill to move
vertically and simplies the lter cleaning process.
4. Remove the air lter.
5. Clean the air lter by vacuuming the surface
or washing it in warm water with mild
detergent.
A. If using a vacuum cleaner, the inlet side
should face the vacuum.
Fig. 4.3
B. If using water, the inlet side should face
down and away from the water stream.
Fig. 4.4
Fig. 4.2