Mitsubishi Electric MSXY-FN07VE-R1 User manual

PARTS CATALOG (OBB779)
SERVICE MANUAL
INDOOR UNIT
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 4
3. SPECIFICATION················································ 6
4. NOISE CRITERIA CURVE ································ 8
5. OUTLINES AND DIMENSIONS ······················ 10
6. WIRING DIAGRAM···········································11
7. REFRIGERANT SYSTEM DIAGRAM ············· 12
8. SERVICE FUNCTIONS ··································· 13
9. MICROPROCESSOR CONTROL ··················· 15
10. TROUBLESHOOTING····································· 21
11. DISASSEMBLY INSTRUCTIONS ···················· 38
No. OBH779
REVISED EDITION-C
MSXY-FN20VE MSXY-FN24VE
OBH779 REVISED EDITION-B is void.
Models
MSXY-FN07VE -R1 ,R2
MSXY-FN10VE -R1 ,R2
MSXY-FN13VE -R1 ,R2
MSXY-FN18VE -R1 ,R2
MSXY-FN20VE -R1 ,R2
MSXY-FN24VE -R1 ,R2
Revision C:
• The drawing of the printed circuit board of the remote
controller for MSXY-FN07/10/13/18/20/24VE- R2 have
been corrected in 8. SERVICE FUNCTIONS.
Outdoor unit service manual
MXY-G·VA - RSeries (OBH722)

2
Use the specied refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
Revision A:
• Model names of the outdoor units have been added to “
10-6. How to check miswiring and serial signal error”.
Revision B:
• MSXY-FN07/10/13/18/20/24VE- R2 have been added.
Revision C:
• The drawing of the printed circuit board of the remote controller for MSXY-FN07/10/13/18/20/24VE- R2 have been corrected
in 8. SERVICE FUNCTIONS.
OBH779C

3
MSXY-FN07VE - R1
MSXY-FN10VE - R1
MSXY-FN13VE - R1
MSXY-FN18VE - R1
MSXY-FN20VE - R1
MSXY-FN24VE - R1
1. New model
MSXY-FN07VE - R1 MSXY-FN07VE - R2
MSXY-FN10VE - R1 MSXY-FN10VE - R2
MSXY-FN13VE - R1 MSXY-FN13VE - R2
MSXY-FN18VE - R1 MSXY-FN18VE - R2
MSXY-FN20VE - R1 MSXY-FN20VE - R2
MSXY-FN24VE - R1 MSXY-FN24VE - R2
1. Remote controller has been changed.
2. Fan speed has been changed.
TECHNICAL CHANGES
1
The following models are compatible with the outdoor units with low standby power control.
Connecting the following models to the MXY series with the low standby power control enables the low standby power control.
The following models may be connected to the MXY series with the low standby power control after once connected to the
MXY series without the low standby power control and operated, for example because of relocation. In that case the MXY ser-
ies with the low standby power control will not operate unless taking a step. Follow the procedure “Deleting the memorized
abnormal condition” described in 10-2.1.
OBH779C

4
2PART NAMES AND FUNCTIONS
MSXY-FN07VE MSXY-FN10VE MSXY-FN13VE MSXY-FN18VE
Operation indicator lamp
Remote control
receiving section
Emergency operation switch
Display section
Horizontal vane
Vertical vane
Fan guard
Air outlet
Fan
Air filter
(Nano platinum filter) Air inlet
Heat exchanger
Front panel
Remote controller
Air cleaning filter
(Microparticle catching filter),
(Anti-Allergy Enzyme Filter,
option)
OBH779C

5
Operation indicator lamp
Remote control
receiving section
Emergency operation switch
Display section
Horizontal vane
Vertical vane
Fan guard
Air outlet
Fan
Air filter
(Nano platinum filter)
Air inlet
Heat exchanger
Front panel
Remote controller
Air cleaning filter
(Microparticle catching filter),
(Anti-Allergy Enzyme Filter,
option)
ACCESSORIES
Model
MSXY-FN07VE
MSXY-FN10VE
MSXY-FN13VE
MSXY-FN18VE
MSXY-FN20VE
MSXY-FN24VE
Installation plate 1
Installation plate xing screw 4 × 25 mm 5
Wireless remote controller 1
Felt tape (Used for left or left-rear piping) 1
Battery (AAA) for remote controller 2
Remote controller holder 1
Fixing screw for 3.5 × 16 mm (Black) 2
Air cleaning lter 2
MSXY-FN20VE MSXY-FN24VE
OBH779C

6
3SPECIFICATION
Indoor model MSXY-
FN07VE- R1 FN10VE- R1 FN13VE- R1 FN18VE- R1 FN20VE- R1 FN24VE- R1
Power supply Single phase 230-240V, 50Hz”
Electrical data
Power input *1 W 21 28 36 42 59
Running current *1 A 0.21 0.27 0.33 0.38 0.52
Fan motor
Model RC0J40-EF RC0J30-MD
Current *1 A 0.21 0.27 0.33 0.38 0.52
Dimensions W × H × D mm 799 x 290 x 232 923 x 305 x 250
Weight kg 9 13
Special remarks
Air direction 4
Airow
Super High
m3/h
666 774 846 888 1,194
High 546 726 960
Med. 378 570 810
Low 246 372 546
Sound level
Super High
dB(A)
42 45 47 49 50
High 36 44 45
Med. 29 30 38 41
Low 19 28 30
Fan speed
Super High
rpm
1,000 1,120 1,200 1,250
High 860 1,070 1,050
Med. 660 890 920
Low 500 650 680
Fan speed regulator 4
Remote controller model KM15D
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24°C
*1 Measured under rated operating frequency.
Specifications and rated conditions of main electric parts
Fuse (F11) T3.15AL250V
Vane motor (MV) 12 V DC
Varistor (NR11) 470 V
Terminal block (TB) 3P
OBH779C

7
Indoor model MSXY-
FN07VE- R2 FN10VE- R2 FN13VE- R2 FN18VE- R2 FN20VE- R2 FN24VE- R2
Power supply Single phase 230-240V, 50Hz”
Electrical data
Power input *1 W 21 28 36 42 59
Running current *1 A 0.21 0.27 0.33 0.38 0.52
Fan motor
Model RC0J40-EF RC0J30-MD
Current *1 A 0.21 0.27 0.33 0.38 0.52
Dimensions W × H × D mm 799 x 290 x 232 923 x 305 x 250
Weight kg 9 13
Special remarks
Air direction 5
Airow
Super High
m3/h
666 774 846 888 1,194
High 546 726 960
Med. 378 570 810
Low 306 462 648
SLow 246 372 546
Sound level
Super High
dB(A)
42 45 47 49 50
High 36 44 45
Med. 29 30 38 41
Low 24 33 35
SLow 19 28 30
Fan speed
Super High
rpm
1,000 1,120 1,200 1,250
High 860 1,070 1,050
Med. 660 890 920
Low 570 760 780
SLow 500 650 680
Fan speed regulator 5
Remote controller model KH18A
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24°C
*1 Measured under rated operating frequency.
Specifications and rated conditions of main electric parts
Fuse (F11) T3.15AL250V
Vane motor (MV) 12 V DC
Varistor (NR11) 470 V
Terminal block (TB) 3P
OBH779C

8
4NOISE CRITERIA CURVES
MSXY-FN07VE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
NC-10
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
42
MSXY-FN10VE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
NC-10
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
47
MSXY-FN13VE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
NC-10
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
45
MSXY-FN18VE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
NC-10
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
49
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
OBH779C

9
Test conditions
Cooling: Dry-bulb temperature 27°C
Wet-bulb temperature 19°C
INDOOR UNIT
WALL
MICROPHONE
0.8m
1m
MSXY-FN24VEMSXY-FN20VE
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
50
NC-10
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
50
NC-10
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
OBH779C

10
5OUTLINES AND DIMENSIONS
Unit: mm
MSXY-FN07VE MSXY-FN10VE MSXY-FN13VE MSXY-FN18VE
2325
69
41
799
785 7
290
12063049
57
80
42
43
69
57
42
7
103
130
100
(57°)
225 225 80.5 80.5
61.5 59.5340338
41
42
249
248
21.5
3
167 157
207.5
206.5
172
14
46
Air in
Installation plate
Piping
Drain hose
Air out
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole ø 65
Piping
Insulation ø37 O.D
Liquid line ø7 - 0.39m (Flared connection ø6.35)
Gas line ø9.52 - 0.34m[Flared connection ø9.52(MSXY-FN07/10/13VE),
ø12.7(MSXY-FN18VE)]
Drain hose
Insulation ø28 Connected part ø16 O.D
19
159
58
MSXY-FN20VE MSXY-FN24VE
19
159
58
Piping
Insulation ø50 O.D
Liquid line ø8 - 0.39m [Flared connection ø6.53(MSXY-FN20VE),
ø9.52(MSXY-FN24VE)]
Gas line ø12 - 0.34m[Flared connection ø12.7(MSXY-FN20VE),
ø15.88(MSXY-FN24VE)]
Drain hose
Insulation ø28 Connected part ø16 O.D
ø
OBH779C

11
WIRING DIAGRAM
6
MSXY-FN07VE MSXY-FN10VE MSXY-FN13VE
MSXY-FN18VE
MSXY-FN20VE MSXY-FN24VE
OBH779C

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7REFRIGERANT SYSTEM DIAGRAM
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø9.52 (MSXY-FN07/10/13VE)
ø12.7 (MSXY-FN18VE)
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Unit: mm
MSXY-FN07VE MSXY-FN10VE MSXY-FN13VE MSXY-FN18VE
MSXY-FN20VE MSXY-FN24VE
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø12.7 (MSXY-FN20VE)
ø15.88 (MSXY-FN24VE)
(with heat insulator)
Refrigerant pipe ø6.35 (MSXY-FN20VE)
ø9.52 (MSXY-FN24VE)
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
OBH779C

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SERVICE FUNCTIONS
8
8-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.
board. (Refer to 10-7.2.)
• The set time for the ON/OFF timer can be reduced to 1 second for each minute.
• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to
1 minute. Restarting the compressor, which takes 3 minutes, cannot be reduced.
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below:
NOTE: For modification, take out the
batteries and press the STOP/
OPERATE (OFF/ON) button 2
or 3 times at first.
After modification, put back the
batteries then press the RESET
button.
MSXY-FN07VE MSXY-FN10VE MSXY-FN13VE
MSXY-FN18VE MSXY-FN20VE MSXY-FN24VE
J2J1
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modication Same as at left Same as at left Same as at left
No. 2 unit — Solder SJ1/J1 Same as at left Same as at left
No. 3 unit — — Solder SJ2/J2 Same as at left
No. 4 unit — — —
Solder both SJ1/J1 and SJ2/J2
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are set.
The setting will be cancelled if the breaker is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has been restored.
SJ2
SJ1
MSY-FN07/10/13/18/20/24VE- R2 : KH18A (SJ1, SJ2)
MSY-FN07/10/13/18/20/24VE- R1 : KM15D (J1, J2)
The P.C. board has the print “SJ1/J1” and “SJ2/J2”. Solder “SJ1/J1” and “SJ2/J2” according to the number of indoor unit as
shown in Table 1.
After modification, press the RESET button.
OBH779C

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NOTE:
• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote
controller.
• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is can-
celled.
• If the unit has been off with the remote controller before power failure, the auto restart function does not work as the
power button of the remote controller is off.
• To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the
same time.
• When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter measures are required to prevent the main voltage-drop or the rush of the starting current
by adding to the system that allows the units to start one by one.
8-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in
the same mode just before the shutoff of the main power.
Operation
If the main power has been cut, the operation settings remain.
After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes for the compressor to start running.)
How to disable “AUTO RESTART FUNCTION”
Turn off the main power for the unit.
Cut the Jumper wire to JR77 on the indoor electronic control P.C. board. (Refer to 10-7.)
JR77
Indoor electronic
control P.C. board
CN10A
CN111
CN151
CN112
CN110
JR77
Indoor electronic
control P.C. board
CN111
CN151
CN112
CN110 CN10A
MSXY-FN07/10/13/18VE MSXY-FN20/24VE
OBH779C

15
MICROPROCESSOR CONTROL
9
WIRELESS REMOTE CONTROLLER
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
ON TIMER button
CLOCK SET button
TIME SET buttons
FORWARD button
BACKWARD button
OFF TIMER button
RESET button
VANE CONTROL button
Signal transmitting section
Operation display section
TEMPERATURE buttons
STOP/OPERATE
(OFF/ON) button
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
Indication of
remote controller
model is on back
POWERFUL COOL button
Distance of signal :
About 6 m
Beep(s) is (are) heard
from the indoor unit when
the signal is received.
ON TIMER button
CLOCK SET button
TIME SET buttons
FORWARD button
BACKWARD button
OFF TIMER button
RESET button
VANE CONTROL button
SMART SET button
Signal transmitting section
Operation display section
TEMPERATURE buttons
STOP/OPERATE
(OFF/ON) button
Battery replacement
indicator
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
Indication of
remote controller
model is on back
POWERFUL COOL button
Distance of signal :
About 6 m
Beep(s) is (are) heard
from the indoor unit when
the signal is received.
RESET
MSXY-FN07VE MSXY-FN10VE MSXY-FN13VE
MSXY-FN18VE MSXY-FN20VE MSXY-FN24VE
MSXY-FN07/10/13/18/20/24VE- R1
MSXY-FN07/10/13/18/20/24VE- R2
OBH779C

16
INDOOR UNIT DISPLAY SECTION
9-1. COOL ( ) OPERATION
(1) Press STOP/OPERATE (OFF/ON) button.
OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select COOL mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons TOO WARM or TOO COOL button to select the desired temperature. The setting range
is 16 - 31°C.
1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil
from frosting.
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor
heat exchanger rises.
2. Low outside temperature operation
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.
Lit
Blinking
Not lit
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
•The following indication applies regardless of shape of the indication.
Indication Operation state Room temperature
The unit is operating to
reach the set temperature
About 2°C or more away
from set temperature
The room temperature is
approaching the set tem-
perature
About 1 to 2°C from set
temperature
Standby mode (only during
multi system operation)
-
OBH779C

17
9-2. DRY ( ) OPERATION
(1) Press STOP/OPERATE (OFF/ON) button.
OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select DRY mode with OPERATION SELECT button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention works the same way as that in COOL mode. (9-1.1.)
2. Low outside temperature operation
Low outside temperature operation works the same way as that in COOL mode. (9-1.2.)
9-3. FAN( )OPERATION
(1) Press STOP/OPERATE (OFF/ON) button.
OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select FAN mode with OPERATION SELECT button.
(3) Select the desired fan speed. When AUTO, it becomes Low.
Only indoor fan operates. Outdoor unit does not operate.
9-4. “I FEEL CONTROL” ( ) OPERATION
(1) Press STOP/OPERATE (OFF/ON) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit
turns ON with a beep tone.
(2) Select “I FEEL CONTROL” mode with OPERATION SELECT button.
(3) The operation mode is determined by the room temperature at startup of the operation.
• Once the mode is fixed, the mode does not change by room temperature afterwards.
• Under the ON-TIMER ( ) operation, mode is determined according to the room temperature at the startup of
operation.
(4) The initial set temperature is decided by the initial room temperature.
Initial room temperature Model Initial set temperature
26°Сor more COOL mode of
"I FEEL CONTROL"
24°С
25 to 26°СInitial room temperature minus 2°С
Less than 25°СDRY mode of
"I FEEL CONTROL" Initial room temperature minus 2°С
(5) TEMPERATURE buttons
In “I FEEL CONTROL” ( ) mode, set temperature is decided by the microprocessor based on the room temperature.
In addition, set temperature can be controlled by TOO WARM or TOO COOL button when you feel too cool or too warm.
Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone.
• Fuzzy control
When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering
the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat
or cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.
In DRY mode of “I FEEL CONTROL”, the set temperature does not change.
TOO
COOL
…To raise the set temperature 1~2°C
TOO
WARM
…To lower the set temperature 1~2°C
OBH779C

18
9-5. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the
selected angle.
Confirming of standard position is performed in the following cases:
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(4) VANE AUTO ( ) mode
In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tem-
perature distribution.
AUTO →1 →2 →3 →4 →5 →SWING
Horizontal
position
In COOL and DRY operation
Vane angle is fixed to Horizontal position.
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When STOP/OPERATE (OFF/ON) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 3 for dew prevention.
(7) SWING ( ) mode
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.
( 8 ) POWERFUL COOL ( ) mode
When POWERFUL COOL button is pressed in COOL mode, the fan speed and the set temperature are automati-
cally adjusted.
Operation becomes POWERFUL COOL mode.
POWERFUL COOL mode is automatically released 15 minutes after operation starts, and the operation mode
returns to the mode prior to POWERFUL COOL operation.
POWERFUL COOL mode is also cancelled when POWERFUL COOL button is pressed once again, OPERATE/
STOP (ON/OFF) button is pressed, FAN SPEED CONTROL button is pressed, ECONO COOL button is pressed or
change to other operation mode.
NOTE1 : The temperature buttons are not available during POWERFUL COOL operation.
2: VANE CONTROL button is available.
(9) ECONO COOL ( ) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher by the
microprocessor.
Also the horizontal vane swings in various cycles.
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air
conditioner can keep comfort. As a result, energy can be saved.
To cancel this operation, select a different mode or press one of the following buttons in ECONO COOL operation:
ECONO COOL, VANE CONTROL or POWERFUL COOL button.
OBH779C

19
9-6. TIMER OPERATION
1. How to set the time
(1) Check that the current time is set correctly.
NOTE: Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display
of TIME MONITOR, so set the current time correctly with CLOCK SET button.
How to set the current time
(a) Press the CLOCK set button.
(b) Press the TIME SET buttons ( and ) to set the current time.
• Each time FORWARD button ( ) is pressed, the set time increases by 1 minute, and each time BACKWARD
button ( ) is pressed, the set time decreases by 1 minute.
• Pressing those buttons longer, the set time increases/decreases by 10 minutes.
(c) Press the CLOCK set button.
(2) Press STOP/OPERATE (OFF/ON) button to start the air conditioner.
(3) Set the time of timer.
ON timer setting
(a) Press ON TIMER button ( ) during operation.
(b) Set the time of the timer using TIME SET buttons ( and ).
OFF timer setting
(a) Press OFF TIMER button ( ) during operation.
(b) Set the time of the timer using TIME SET buttons ( and ).
Each time FORWARD button ( ) is pressed, the set time increases by 10 minutes: each time BACKWARD but-
ton ( ) is pressed, the set time decreases by 10 minutes.
2. To release the timer
To release ON timer, press ON TIMER button ( ).
To release OFF timer, press OFF TIMER button( ).
TIMER is cancelled and the display of set time disappears.
(Example 1) The current time is 8:00 PM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
• OFF timer and ON timer can be used in combination. The set time that is reached first will operate first.
• “ ” and “ ” display shows the order of OFF timer and ON timer operation.
PROGRAM TIMER
(Example 2) The current time is 11:00 AM.
The unit turns on at 5:00 PM, and off at 9:00 PM.
NOTE: If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is can-
celled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer
cancelled when power is restored.
9-7. SMART SET ( ) OPERATION
1. How to SET SMART SET operation
(1) Press STOP/OPERATE (OFF/ON) button.
(2) Select COOL or ECONO COOL mode.
(3) Press SMART SET button.
(4) Set the temperature, fan speed, and airow direction for SMART SET operation.
NOTE:
• SMART SET operation cannot be selected during DRY or AUTO mode operation.
• 1 group of setting can be saved.
2. How to cancel operation
• Press SMART SET button again.
• SMART SET operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode.
The same setting is selected from the next time by simply pressing SMART SET button.
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20
9-9. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect
compressor from overload.
Emergency
operation switch
(E.O. SW)
9-8. EMERGENCY/TEST OPERATION
In the case of test run operation or emergency operation, use
EMERGENCY OPERATION switch on the right side of the indoor unit.
Emergency operation is available when the remote controller is miss-
ing or has failed, or when the batteries in the remote controller are
running down. The unit will start and OPERATION INDICATOR lamp
will light up.
The first 30 minutes of operation is the test run operation. This opera-
tion is for servicing. The indoor fan runs at High speed and the tem-
perature control does not work.
After 30 minutes of test run operation, the system shifts to
EMERGENCY COOL MODE with a set temperature of 24°C. The fan
speed shifts to Medium.
The coil frost prevention works even in the test run or the emergency
operation.
In the test run or the emergency operation, the horizontal vane oper-
ates in VANE AUTO ( ) mode.
Emergency operation continues until EMERGENCY OPERATION
switch is pressed once the unit receives any signal from the remote
controller. In the latter case, normal operation will start.
NOTE: Do not press EMERGENCY OPERATION switch during normal operation.
Operation mode COOL
Set temperature 24°C
Fan speed Medium
Horizontal vane Auto
The operation mode is indicated by the
Operation Indicator lamp as following
Operation Indicator lamp
EMERGENCY COOL
↓
STOP
Lit
Not lit
OBH779C