Mitsubishi Electric TRANE NTXDKS09A112AA User manual

English
Air-Conditioners
NTXDKS09,12,15,18A112AA
OPERATION MANUAL
For safe and correct use, please read this operation manual thoroughly before operating the air-conditioner unit.
FOR USER

2
Contents
sBefore installing the unit, make sure you read all the “Safety
Precautions”.
sThe “Safety Precautions” provide very important points regard-
ing safety. Make sure you follow them.
sPlease report to or take consent by the supply authority be-
fore connection to the system.
1. Safety Precautions
2. Parts Names
■Indoor Unit
NTXDKS·A112AA
Fan steps 3 steps
Vane –
Louver –
Filter Normal
Filter cleaning indication –
Symbols used in the text
Warning:
Describes precautions that should be observed to prevent danger of
injury or death to the user.
Caution:
Describes precautions that should be observed to prevent damage
to the unit.
Symbols used in the illustrations
:Indicates a part which must be grounded.
Warning:
•The unit must not be installed by the user. Ask the dealer or an
authorized company to install the unit. If the unit is installed im-
properly, water leakage, electric shock or fire may result.
•Do not stand on, or place any items on the unit.
•Do not splash water over the unit and do not touch the unit with
wet hands. An electric shock may result.
•Do not spray combustible gas close to the unit. Fire may result.
•Do not place a gas heater or any other open-flame appliance where
it will be exposed to the air discharged from the unit. Incomplete
combustion may result.
•Do not remove the front panel or the fan guard from the outdoor
unit when it is running.
•When you notice exceptionally abnormal noise or vibration, stop
operation, turn off the power switch, and contact your dealer.
•Never insert fingers, sticks etc. into the intakes or outlets.
•If you detect odd smells, stop using the unit, turn off the power
switch and consult your dealer. Otherwise, a breakdown, electric
shock or fire may result.
•This air conditioner is NOT intended for use by children or infirm
persons without supervision.
•Young children must be supervised to ensure that they do not play
with the air conditioner.
• If the refrigeration gas blows out or leaks, stop the operation of the
air conditioner, thoroughly ventilate the room, and contact your dealer.
Caution:
•Do not use any sharp object to push the buttons, as this may dam-
age the remote controller.
•Never block or cover the indoor or outdoor unit’s intakes or outlets.
Disposing of the unit
When you need to dispose of the unit, consult your dealer.
■NTXDKS·A112AA
Ceiling Concealed
1. Safety Precautions ................................................................ 2
2. Parts Names .......................................................................... 2
3. Operation............................................................................... 4
4. Timer ..................................................................................... 4
5. Emergency Operation for IR Wireless Remote Controller ..... 4
6. Care and Cleaning ................................................................ 5
7. Troubleshooting ..................................................................... 6
8. Specifications ........................................................................ 7
Air outlet
Air intake
Filter
01_VN79D600H01_GB.p65 18.8.29, 15:362
3
2. Parts Names
Radio frequency interface Wired remote controller IR wireless remote controller
■Remote controller (Optional parts)
RF thermostat
■Outdoor unit
Power
Ground
Indoor-Outdoor
Connection wire
Refrigerant
Pipes
01_VN79D600H01_GB.p65 18.8.29, 15:363

2
Contents
sBefore installing the unit, make sure you read all the “Safety
Precautions”.
sThe “Safety Precautions” provide very important points regard-
ing safety. Make sure you follow them.
sPlease report to or take consent by the supply authority be-
fore connection to the system.
1. Safety Precautions
2. Parts Names
■Indoor Unit
NTXDKS·A112AA
Fan steps 3 steps
Vane –
Louver –
Filter Normal
Filter cleaning indication –
Symbols used in the text
Warning:
Describes precautions that should be observed to prevent danger of
injury or death to the user.
Caution:
Describes precautions that should be observed to prevent damage
to the unit.
Symbols used in the illustrations
:Indicates a part which must be grounded.
Warning:
•The unit must not be installed by the user. Ask the dealer or an
authorized company to install the unit. If the unit is installed im-
properly, water leakage, electric shock or fire may result.
•Do not stand on, or place any items on the unit.
•Do not splash water over the unit and do not touch the unit with
wet hands. An electric shock may result.
•Do not spray combustible gas close to the unit. Fire may result.
•Do not place a gas heater or any other open-flame appliance where
it will be exposed to the air discharged from the unit. Incomplete
combustion may result.
•Do not remove the front panel or the fan guard from the outdoor
unit when it is running.
•When you notice exceptionally abnormal noise or vibration, stop
operation, turn off the power switch, and contact your dealer.
•Never insert fingers, sticks etc. into the intakes or outlets.
•If you detect odd smells, stop using the unit, turn off the power
switch and consult your dealer. Otherwise, a breakdown, electric
shock or fire may result.
•This air conditioner is NOT intended for use by children or infirm
persons without supervision.
•Young children must be supervised to ensure that they do not play
with the air conditioner.
• If the refrigeration gas blows out or leaks, stop the operation of the
air conditioner, thoroughly ventilate the room, and contact your dealer.
Caution:
•Do not use any sharp object to push the buttons, as this may dam-
age the remote controller.
•Never block or cover the indoor or outdoor unit’s intakes or outlets.
Disposing of the unit
When you need to dispose of the unit, consult your dealer.
■NTXDKS·A112AA
Ceiling Concealed
1. Safety Precautions ................................................................ 2
2. Parts Names .......................................................................... 2
3. Operation............................................................................... 4
4. Timer ..................................................................................... 4
5. Emergency Operation for IR Wireless Remote Controller ..... 4
6. Care and Cleaning ................................................................ 5
7. Troubleshooting ..................................................................... 6
8. Specifications ........................................................................ 7
Air outlet
Air intake
Filter
01_VN79D600H01_GB.p65 18.8.29, 15:362
3
2. Parts Names
Radio frequency interface Wired remote controller IR wireless remote controller
■Remote controller (Optional parts)
RF thermostat
■Outdoor unit
Power
Ground
Indoor-Outdoor
Connection wire
Refrigerant
Pipes
01_VN79D600H01_GB.p65 18.8.29, 15:363

5
6. Care and Cleaning
ss
ss
sCleaning the filters
•Clean the filters using a vacuum cleaner. If you do not have a vacuum
cleaner, tap the filters against a solid object to knock off dirt and dust.
•If the filters are especially dirty, wash them in lukewarm water. Take care
to rinse off any detergent thoroughly and allow the filters to dry com-
pletely before putting them back into the unit.
Caution:
•Do not dry the filters in direct sunlight or by using a heat source,
such as an electric heater: this may warp them.
•Do not wash the filters in hot water (above 122 °F [50 °C]), as this
may warp them.
•Make sure that the air filters are always installed. Operating the
unit without air filters can cause malfunction.
Caution:
•Before you start cleaning, stop operation and turn OFF the power
supply.
•Indoor units are equipped with filters to remove the dust of sucked-in
air. Clean the filters using the methods shown in the following sketches.
ss
ss
sFilter removal
Caution:
•In removing the filter, precautions must be taken to protect your
eyes from dust. Also, if you have to climb up on a stool to do the
job, be careful not to fall.
•When the filter is removed, do not touch the metallic parts inside
the indoor unit, otherwise injury may result.
■NTXDKS·A112AA
•While lifting the filter knob, pull it.
AAir intake BAir outlet C Filter D Knob
B
C
A
D
D
01_VN79D600H01_GB.p65 18.8.29, 15:365
4
4. Timer
3. Operation
Cooling mode 15 minutes (switches
from heating to cooling)
Set temperature +4 °F [2 °C]
Set temperature
Set temperature -4 °F [2 °C]
15 minutes (switches
from cooling to heating )
3.2. Fan speed setting
Note:
●The number of available fan speeds depends on the type of unit connected.
●In the following cases, the actual fan speed generated by the unit will differ
from the speed shown the remote controller display.
1. When the unit is in STAND BY or DEFROST states.
2. When the temperature of the heat exchanger is low in the heating mode.
(e.g. immediately after heating operation starts)
3. In HEAT mode, when room temperature is higher than the temperature
setting.
4. When the unit is in DRY mode.
3.3. Ventilation
ss
ss
sFor LOSSNAY combination
●The following 2 patterns of operation are available.
•Run the ventilator together with the indoor unit.
•Run the ventilator independently.
Note:
●With some model configurations, the fan on the indoor unit may come on
even when you set the ventilator to run independently.
Note (for IR wireless remote controller and RF thermostat):
●Running the ventilator independently is not available.
●No indication on the remote controller.
■About the operation method, refer to the operation manual that comes
with each remote controller.
3.1. Operation mode select
Cool/Dry/Fan/Heat/Automatic (cool/heat)/Ventilation modes are available.
Note:
●Heat and Automatic modes can not be available for cooling only units.
●Ventilation mode: only indicated on the following condition.
Wired remote controller is used and LOSSNAY is connected.
●Automatic mode
•According to a set temperature, cooling operation starts if the room
temperature is too hot and heating operation starts if the room
temperature is too cold.
•During automatic operation, if the room temperature changes and
remains 4 °F [2 °C] or more above the set temperature for 15 minutes,
the air conditioner switches to cooling mode. If the room temperature
remains 4 °F [2 °C] or more below the set temperature for 15 minutes,
the air conditioner switches to heating mode.
■Timer functions are different by each remote controller.
■Refer to the operation manual that comes with each remote controller for the details included an operation method.
5. Emergency Operation for IR Wireless Remote Controller
ON/OFF
HEAT COOL
2
1
1ON/OFF lamp (lit when unit is operating; unlit when unit is not operat-
ing)
2Emergency operation
In cases where the remote control unit does not operate properly, use
either the COOL or HEAT button on the wireless remote control
signal receiver to toggle the unit on or off. On cooler only units, pushing
the HEAT button toggles the fan on and off.
Pressing the COOL or HEAT button selects the following settings.
Operation mode COOL HEAT
Preset temperature 24 °C/75 °F 24 °C/75 °F
Fan speed High High
01_VN79D600H01_GB.p65 18.8.29, 15:364

5
6. Care and Cleaning
ss
ss
sCleaning the filters
•Clean the filters using a vacuum cleaner. If you do not have a vacuum
cleaner, tap the filters against a solid object to knock off dirt and dust.
•If the filters are especially dirty, wash them in lukewarm water. Take care
to rinse off any detergent thoroughly and allow the filters to dry com-
pletely before putting them back into the unit.
Caution:
•Do not dry the filters in direct sunlight or by using a heat source,
such as an electric heater: this may warp them.
•Do not wash the filters in hot water (above 122 °F [50 °C]), as this
may warp them.
•Make sure that the air filters are always installed. Operating the
unit without air filters can cause malfunction.
Caution:
•Before you start cleaning, stop operation and turn OFF the power
supply.
•Indoor units are equipped with filters to remove the dust of sucked-in
air. Clean the filters using the methods shown in the following sketches.
ss
ss
sFilter removal
Caution:
•In removing the filter, precautions must be taken to protect your
eyes from dust. Also, if you have to climb up on a stool to do the
job, be careful not to fall.
•When the filter is removed, do not touch the metallic parts inside
the indoor unit, otherwise injury may result.
■NTXDKS·A112AA
•While lifting the filter knob, pull it.
AAir intake BAir outlet C Filter D Knob
B
C
A
D
D
01_VN79D600H01_GB.p65 18.8.29, 15:365
4
4. Timer
3. Operation
Cooling mode 15 minutes (switches
from heating to cooling)
Set temperature +4 °F [2 °C]
Set temperature
Set temperature -4 °F [2 °C]
15 minutes (switches
from cooling to heating )
3.2. Fan speed setting
Note:
●The number of available fan speeds depends on the type of unit connected.
●In the following cases, the actual fan speed generated by the unit will differ
from the speed shown the remote controller display.
1. When the unit is in STAND BY or DEFROST states.
2. When the temperature of the heat exchanger is low in the heating mode.
(e.g. immediately after heating operation starts)
3. In HEAT mode, when room temperature is higher than the temperature
setting.
4. When the unit is in DRY mode.
3.3. Ventilation
ss
ss
sFor LOSSNAY combination
●The following 2 patterns of operation are available.
•Run the ventilator together with the indoor unit.
•Run the ventilator independently.
Note:
●With some model configurations, the fan on the indoor unit may come on
even when you set the ventilator to run independently.
Note (for IR wireless remote controller and RF thermostat):
●Running the ventilator independently is not available.
●No indication on the remote controller.
■About the operation method, refer to the operation manual that comes
with each remote controller.
3.1. Operation mode select
Cool/Dry/Fan/Heat/Automatic (cool/heat)/Ventilation modes are available.
Note:
●Heat and Automatic modes can not be available for cooling only units.
●Ventilation mode: only indicated on the following condition.
Wired remote controller is used and LOSSNAY is connected.
●Automatic mode
•According to a set temperature, cooling operation starts if the room
temperature is too hot and heating operation starts if the room
temperature is too cold.
•During automatic operation, if the room temperature changes and
remains 4 °F [2 °C] or more above the set temperature for 15 minutes,
the air conditioner switches to cooling mode. If the room temperature
remains 4 °F [2 °C] or more below the set temperature for 15 minutes,
the air conditioner switches to heating mode.
■Timer functions are different by each remote controller.
■Refer to the operation manual that comes with each remote controller for the details included an operation method.
5. Emergency Operation for IR Wireless Remote Controller
ON/OFF
HEAT COOL
2
1
1ON/OFF lamp (lit when unit is operating; unlit when unit is not operat-
ing)
2Emergency operation
In cases where the remote control unit does not operate properly, use
either the COOL or HEAT button on the wireless remote control
signal receiver to toggle the unit on or off. On cooler only units, pushing
the HEAT button toggles the fan on and off.
Pressing the COOL or HEAT button selects the following settings.
Operation mode COOL HEAT
Preset temperature 24 °C/75 °F 24 °C/75 °F
Fan speed High High
01_VN79D600H01_GB.p65 18.8.29, 15:364

7
7. Troubleshooting
T noituloSgnitoohselbuor
Operating sound is louder than specifications.
Nothing appears in the IR wireless remote controller display, the display is
faint, or signals are not received by the indoor unit unless the IR remote
controller is close. (*2)
The operation lamp near the receiver for the IR wireless remote controller
on the indoor unit is blinking. (*2)
The indoor operation sound level is affected by the acoustics of the par-
ticular room as shown in the following table and will be higher than the
sound specification, which was measured in an echo-free room.
The batteries are low.
Replace the batteries and press the Reset button.
If nothing appears even after the batteries are replaced, make sure that
the batteries are installed in the correct directions (+, –).
The self diagnosis function has operated to protect the air conditioner.
Do not attempt to repair this equipment by yourself.
Turn off the power switch immediately and consult your dealer. Be sure
to provide the dealer with the model name.
High sound-
absorbing rooms
Broadcasting
studio, music
room, etc.
3 to 7 dB
Normal rooms
Reception room,
hotel lobby, etc.
6 to 10 dB
Low sound-
absorbing rooms
Office, hotel
room
9 to 13 dB
Location
examples
Noise levels
*2: Only for IR wireless remote controller
8. Specifications
Notes: 1. Rating conditions (cooling) Indoor : 80 °F [26.7 °C] D.B., 67 °F [19.4 °C] W.B. Outdoor : 95 °F [35 °C] D.B.
.B.W]C°1.6[F°34,.B.D]C°3.8[F°74:roodtuO.B.D]C°1.12[F°07:roodnI)gnitaeh(snoitidnocgnitaR.2
3. The capacity is indicated the value when one indoor unit is connected to the outdoor unit.
4. Specifications subject to change without notice.
5. The external static pressure is set to 15 Pa at factory shipment.
Guaranteed operating range
Indoor
Cooling
Upper limit 95 °F [35 °C] D.B.
71 °F [21.7 °C] W.B.
Lower limit 67 °F [19.4 °C] D.B.
57 °F [13.9 °C] W.B.
Heating
Upper limit 80 °F [26.7 °C] D.B.
–
Lower limit 70 °F [21.1 °C] D.B.
–
Notes: 1. Units should be installed by licensed electric contractor accordingly to local code requirement.
2. For outdoor units to be connected, refer to the Installation Manual that comes with the units.
NTXDKS12A112AA
Cooling Heating
12,000 13,600
0.07 0.05
7-9-11
247-317-388
116-150-183
0.02-0.06-0.14-0.20
[5/15/35/50]
23-28-33
22 [49]
Model
Function
Power supply
Capacity BTU/h
Input kW
CMM
Airflow (Lo-Mid-Hi) CFM
L/S
Ext. static pressure in. WG
[Pa]
Noise level (Lo-Mid-Hi) dB
Weight kg [Ib]
NTXDKS15A112AA
Cooling Heating
15,000 18,000
0.09 0.07
10-12.5-15
353-441-529
167-208-250
0.02-0.06-0.14-0.20
[5/15/35/50]
30-34-37
23 [51]
NTXDKS18A112AA
Cooling Heating
22,000 23,200
0.09 0.07
12-15-18
423-529-635
200-250-300
0.02-0.06-0.14-0.20
[5/15/35/50]
30-34-38
26.5 [59]
NTXDKS09A112AA
Cooling Heating
9,000 10,900
0.06 0.04
5.5-7-9
194-247-317
91-116-150
0.02-0.06-0.14-0.20
[5/15/35/50]
23-26-30
19 [42]
~/N, 208/230V, 60Hz
01_VN79D600H01_GB.p65 18.8.29, 15:367
6
7. Troubleshooting
Troubleshooting
Air conditioner does not heat or cool well.
When heating operation starts, warm air does not blow from the indoor unit
immediately.
During heating mode, the air conditioner stops before the set room tem-
perature is reached.
When the airflow direction is changed, the vanes always move up and down
past the set position before finally stopping at the position.
A flowing water sound or occasional hissing sound is heard.
A cracking or creaking sound is heard.
The room has an unpleasant odor.
A white mist or vapor is emitted from the indoor unit.
Water or vapor is emitted from the outdoor unit.
The operation indicator does not appear in the wired remote controller
display. (*1)
“” appears in the wired remote controller display. (*1)
When restarting the air conditioner soon after stopping it, it does not
operate even though the ON/OFF button is pressed.
Air conditioner operates without the ON/OFF button being pressed. (*1)
Air conditioner stops without the ON/OFF button being pressed. (*1)
Wired remote controller timer operation cannot be set. (*1)
“PLEASE WAIT” appears in the wired remote controller display. (*1)
An error code appears in the remote controller display.
Draining water or motor rotation sound is heard.
Solution
■Clean the filter. (Airflow is reduced when the filter is dirty or clogged.)
■Check the temperature adjustment and adjust the set temperature.
■Make sure that there is plenty of space around the outdoor unit. Is the
indoor unit air intake or outlet blocked?
■Has a door or window been left open?
■Warm air does not blow until the indoor unit has sufficiently warmed up.
■When the outdoor temperature is low and the humidity is high, frost may
form on the outdoor unit. If this occurs, the outdoor unit performs a de-
frosting operation. Normal operation should begin after approximately 10
minutes.
■When the airflow direction is changed, the vanes move to the set position
after detecting the base position.
■These sounds can be heard when refrigerant is flowing in the air condi-
tioner or when the refrigerant flow is changing.
■These sounds can be heard when parts rub against each due to expan-
sion and contraction from temperature changes.
■The indoor unit draws in air that contains gases produced from the walls,
carpeting, and furniture as well as odors trapped in clothing, and then
blows this air back into the room.
■If the indoor temperature and the humidity are high, this condition may
occur when operation starts.
■During defrosting mode, cool airflow may blow down and appear like a
mist.
■During cooling mode, water may form and drip from the cool pipes and
joints.
■During heating mode, water may form and drip from the heat exchanger.
■During defrosting mode, water on the heat exchanger evaporates and
water vapor may be emitted.
■ Turn on the power switch. “ ” will appear in the wired remote controller
display.
■During central control, “ ” appears in the wired remote controller
display and air conditioner operation cannot be started or stopped using
the wired remote controller.
■Wait approximately three minutes.
(Operation has stopped to protect the air conditioner.)
■Is the on timer set?
Press the ON/OFF button to stop operation.
■Is the air conditioner connected to a central wired remote controller?
Consult the concerned people who control the air conditioner.
■Does “ ” appear in the wired remote controller display?
Consult the concerned people who control the air conditioner.
■Has the auto recovery feature from power failures been set?
Press the ON/OFF button to stop operation.
■Is the off timer set?
Press the ON/OFF button to restart operation.
■Is the air conditioner connected to a central wired remote controller?
Consult the concerned people who control the air conditioner.
■Does “ ” appear in the wired remote controller display?
Consult the concerned people who control the air conditioner.
■Are timer settings invalid?
If the timer can be set, or appears in the remote controller display.
■The initial settings are being performed. Wait approximately 3 minutes.
■The protection devices have been operated to protect the air conditioner.
■Do not attempt to repair this equipment by yourself.
Turn off the power switch immediately and consult your dealer. Be sure
to provide the dealer with the model name and information that appeared
in the remote controller display.
■When cooling operation stops, the drain pump operates and then stops.
Wait approximately 3 minutes.
*1: Only for wired remote controller
01_VN79D600H01_GB.p65 18.8.29, 15:366

7
7. Troubleshooting
T noituloSgnitoohselbuor
Operating sound is louder than specifications.
Nothing appears in the IR wireless remote controller display, the display is
faint, or signals are not received by the indoor unit unless the IR remote
controller is close. (*2)
The operation lamp near the receiver for the IR wireless remote controller
on the indoor unit is blinking. (*2)
The indoor operation sound level is affected by the acoustics of the par-
ticular room as shown in the following table and will be higher than the
sound specification, which was measured in an echo-free room.
The batteries are low.
Replace the batteries and press the Reset button.
If nothing appears even after the batteries are replaced, make sure that
the batteries are installed in the correct directions (+, –).
The self diagnosis function has operated to protect the air conditioner.
Do not attempt to repair this equipment by yourself.
Turn off the power switch immediately and consult your dealer. Be sure
to provide the dealer with the model name.
High sound-
absorbing rooms
Broadcasting
studio, music
room, etc.
3 to 7 dB
Normal rooms
Reception room,
hotel lobby, etc.
6 to 10 dB
Low sound-
absorbing rooms
Office, hotel
room
9 to 13 dB
Location
examples
Noise levels
*2: Only for IR wireless remote controller
8. Specifications
Notes: 1. Rating conditions (cooling) Indoor : 80 °F [26.7 °C] D.B., 67 °F [19.4 °C] W.B. Outdoor : 95 °F [35 °C] D.B.
.B.W]C°1.6[F°34,.B.D]C°3.8[F°74:roodtuO.B.D]C°1.12[F°07:roodnI)gnitaeh(snoitidnocgnitaR.2
3. The capacity is indicated the value when one indoor unit is connected to the outdoor unit.
4. Specifications subject to change without notice.
5. The external static pressure is set to 15 Pa at factory shipment.
Guaranteed operating range
Indoor
Cooling
Upper limit 95 °F [35 °C] D.B.
71 °F [21.7 °C] W.B.
Lower limit 67 °F [19.4 °C] D.B.
57 °F [13.9 °C] W.B.
Heating
Upper limit 80 °F [26.7 °C] D.B.
–
Lower limit 70 °F [21.1 °C] D.B.
–
Notes: 1. Units should be installed by licensed electric contractor accordingly to local code requirement.
2. For outdoor units to be connected, refer to the Installation Manual that comes with the units.
NTXDKS12A112AA
Cooling Heating
12,000 13,600
0.07 0.05
7-9-11
247-317-388
116-150-183
0.02-0.06-0.14-0.20
[5/15/35/50]
23-28-33
22 [49]
Model
Function
Power supply
Capacity BTU/h
Input kW
CMM
Airflow (Lo-Mid-Hi) CFM
L/S
Ext. static pressure in. WG
[Pa]
Noise level (Lo-Mid-Hi) dB
Weight kg [Ib]
NTXDKS15A112AA
Cooling Heating
15,000 18,000
0.09 0.07
10-12.5-15
353-441-529
167-208-250
0.02-0.06-0.14-0.20
[5/15/35/50]
30-34-37
23 [51]
NTXDKS18A112AA
Cooling Heating
22,000 23,200
0.09 0.07
12-15-18
423-529-635
200-250-300
0.02-0.06-0.14-0.20
[5/15/35/50]
30-34-38
26.5 [59]
NTXDKS09A112AA
Cooling Heating
9,000 10,900
0.06 0.04
5.5-7-9
194-247-317
91-116-150
0.02-0.06-0.14-0.20
[5/15/35/50]
23-26-30
19 [42]
~/N, 208/230V, 60Hz
01_VN79D600H01_GB.p65 18.8.29, 15:367
6
7. Troubleshooting
Troubleshooting
Air conditioner does not heat or cool well.
When heating operation starts, warm air does not blow from the indoor unit
immediately.
During heating mode, the air conditioner stops before the set room tem-
perature is reached.
When the airflow direction is changed, the vanes always move up and down
past the set position before finally stopping at the position.
A flowing water sound or occasional hissing sound is heard.
A cracking or creaking sound is heard.
The room has an unpleasant odor.
A white mist or vapor is emitted from the indoor unit.
Water or vapor is emitted from the outdoor unit.
The operation indicator does not appear in the wired remote controller
display. (*1)
“” appears in the wired remote controller display. (*1)
When restarting the air conditioner soon after stopping it, it does not
operate even though the ON/OFF button is pressed.
Air conditioner operates without the ON/OFF button being pressed. (*1)
Air conditioner stops without the ON/OFF button being pressed. (*1)
Wired remote controller timer operation cannot be set. (*1)
“PLEASE WAIT” appears in the wired remote controller display. (*1)
An error code appears in the remote controller display.
Draining water or motor rotation sound is heard.
Solution
■Clean the filter. (Airflow is reduced when the filter is dirty or clogged.)
■Check the temperature adjustment and adjust the set temperature.
■Make sure that there is plenty of space around the outdoor unit. Is the
indoor unit air intake or outlet blocked?
■Has a door or window been left open?
■Warm air does not blow until the indoor unit has sufficiently warmed up.
■When the outdoor temperature is low and the humidity is high, frost may
form on the outdoor unit. If this occurs, the outdoor unit performs a de-
frosting operation. Normal operation should begin after approximately 10
minutes.
■When the airflow direction is changed, the vanes move to the set position
after detecting the base position.
■These sounds can be heard when refrigerant is flowing in the air condi-
tioner or when the refrigerant flow is changing.
■These sounds can be heard when parts rub against each due to expan-
sion and contraction from temperature changes.
■The indoor unit draws in air that contains gases produced from the walls,
carpeting, and furniture as well as odors trapped in clothing, and then
blows this air back into the room.
■If the indoor temperature and the humidity are high, this condition may
occur when operation starts.
■During defrosting mode, cool airflow may blow down and appear like a
mist.
■During cooling mode, water may form and drip from the cool pipes and
joints.
■During heating mode, water may form and drip from the heat exchanger.
■During defrosting mode, water on the heat exchanger evaporates and
water vapor may be emitted.
■ Turn on the power switch. “ ” will appear in the wired remote controller
display.
■During central control, “ ” appears in the wired remote controller
display and air conditioner operation cannot be started or stopped using
the wired remote controller.
■Wait approximately three minutes.
(Operation has stopped to protect the air conditioner.)
■Is the on timer set?
Press the ON/OFF button to stop operation.
■Is the air conditioner connected to a central wired remote controller?
Consult the concerned people who control the air conditioner.
■Does “ ” appear in the wired remote controller display?
Consult the concerned people who control the air conditioner.
■Has the auto recovery feature from power failures been set?
Press the ON/OFF button to stop operation.
■Is the off timer set?
Press the ON/OFF button to restart operation.
■Is the air conditioner connected to a central wired remote controller?
Consult the concerned people who control the air conditioner.
■Does “ ” appear in the wired remote controller display?
Consult the concerned people who control the air conditioner.
■Are timer settings invalid?
If the timer can be set, or appears in the remote controller display.
■The initial settings are being performed. Wait approximately 3 minutes.
■The protection devices have been operated to protect the air conditioner.
■Do not attempt to repair this equipment by yourself.
Turn off the power switch immediately and consult your dealer. Be sure
to provide the dealer with the model name and information that appeared
in the remote controller display.
■When cooling operation stops, the drain pump operates and then stops.
Wait approximately 3 minutes.
*1: Only for wired remote controller
01_VN79D600H01_GB.p65 18.8.29, 15:366

This product is designed and intended for use in the residential,
commercial and light-industrial environment.
VN79D600H01
Please be sure to put the contact address/telephone number on
this manual before handing it to the customer.
Address: 1340 Satellite Blvd, Suwanee, GA 30024
MITSUBISHI ELECTRIC TRANE HVAC US LLC