Mitsubishi Electric MUFZ-KJ-NAHZ Series User manual

INDOOR UNIT
SERVICE MANUAL
Models
MFZ-KJ09NA-U1
MFZ-KJ12NA-U1
MFZ-KJ15NA-U1
MFZ-KJ18NA-U1
NOTE:
• This service manual describes technical data of the indoor units.
• RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
No. OBH752
REVISED EDITION-B
PARTS CATALOG (OBB752)
Outdoor unit service manual
MUFZ-KJ•NAHZ Series (OBH753)
MXZ-C•NA, MXZ-C•NAHZ Series
(OBH702, OCH573)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 4
3. SPECIFICATION················································ 5
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM············································ 8
6. REFRIGERANT SYSTEM DIAGRAM··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING····································· 21
10. DISASSEMBLY INSTRUCTIONS···················· 36
OBH752 REVISED EDITION-A is void.
Revision B:
• 4. OUTLINES AND DIMENSIONS has been
modified.
INDOOR UNIT

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:
• 3. SPECIFICATION and 4. OUTLINES AND DIMENSIONS have been modified.
Revision B:
• 4. OUTLINES AND DIMENSIONS has been modified.
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1TECHNICAL CHANGES
MFZ-KJ09NA- U1
MFZ-KJ12NA- U1
MFZ-KJ15NA- U1
MFZ-KJ18NA- U1
1. New model
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2PART NAMES AND FUNCTIONS
MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA
E.O
SW
Display and operation section (When the front panel is opened)
Operation indicator lamp
Emergency operation
switch
Remote control receiving section
Fan guard
Air outlet
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(Anti-allergy enzyme filter, option)
$LU¿OWHU
1DQRSODWLQXP¿OWHU
Panel
Front panel
Horizontal vane
Vertical vane
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ACCESSORIES
MFZ-KJ09NA MFZ-KJ12NA
MFZ-KJ15NA MFZ-KJ18NA
Drain hose 1
Remote controller holder 1
Fixing screw for 3.5 x 16 mm (Black) 2
Pipe cover 1
Band 2
Battery (AAA) for remote controller 2
Indoor unit mounting bracket 1
Fixing screw for 4 x 25 mm 5
Wood screw for the indoor unit ¿xation 4
Washer of 4
Felt tape (Used for left or left-rear piping) 1
Wireless remote controller 1
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3SPECIFICATION
Indoor model MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA
Power supply V, phase, Hz 208/230, 1, 60
Max. fuse size (time delay)/ Disconnect switch A15 20
AirÀow
Super High - High - Med. -
Low - Quiet
COOL Dry
(Wet)
CFM 417 - 360 - 272 - 198 - 138
(354 - 306 - 231 - 168 - 117)
431 - 392 - 311 - 254 - 198
(366 - 333 - 264 - 216 - 168)
491 - 420 - 328 - 254 - 198
(417 - 357 - 279 - 216 - 168)
HEAT Dry CFM 417 - 328 - 254 - 191 - 138 470 - 399 - 328 - 268 - 212
Sound level
Super High - High - Med. -
Low - Quiet
Cooling dB (A) 46 - 41 - 34 - 27 - 21
47 - 43 - 38 - 33 - 28 50 - 45 - 39 - 33 - 28
Heating dB (A) 46 - 40 - 34 - 27 - 21 49 - 45 - 40 - 35 - 29 49 - 45 - 40 - 35 - 29
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
29-17/32
D8-15/32
H23-5/8
Weight Ib. 33
External ¿nish White
Control voltage (by built-in transformer) 12 - 24 VDC
NOTE: Test conditions are based on ARI 210/240.
Indoor model MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA
Power supply V, phase, Hz 208/230, 1, 60
Max. fuse size (time delay)/ Disconnect switch A15 20
AirÀow
Super High - High - Med. -
Low - Quiet
COOL Dry
(Wet)
CFM 275 - 251 - 208 173 - 138
(234 - 213 - 177 - 147 - 117)
374 - 328 - 282 - 237 - 198
(318 - 279 - 240 - 201 - 168)
HEAT Dry CFM 343 - 219 - 180 - 159 - 138 470 - 325 - 290 - 254 - 212
Sound level
Super High - High - Med. -
Low - Quiet
Cooling dB (A) 38 - 34 - 30 - 25 - 21 43 - 40 - 36 - 31 - 28
Heating dB (A) 41 - 32 - 27 - 24 - 21 49 - 39 - 36 - 34 - 29
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
29-17/32
D8-15/32
H23-5/8
Weight Ib. 33
External ¿nish White
Control voltage (by built-in transformer) 12 - 24 VDC
NOTE: Test conditions are based on ARI 210/240.
1. Single connection
2. Multi connection
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 The air coverage is the figure up to the
position where the air speed is 1 ft./s.,
when air is blown out horizontally from
the unit properly at the High speed posi-
tion.
The coverage should be used only as a
general guideline since it varies accord-
ing to the size of the room and furniture
arranged inside the room.
3-2. OUTLET AIR SPEED AND COVERAGE
1. Single connection
Model Mode Function AirÀow
(CFM)
Air speed
(ft./s.)
Coverage (ft.)
MFZ-KJ09NA
MFZ-KJ12NA
HEAT Dry 417 20.3 29.6
COOL Dry 417 20.3 29.6
Wet 354 17.2 25.3
MFZ-KJ15NA
HEAT Dry 470 22.9 33.3
COOL Dry 431 21.0 30.6
Wet 366 17.8 26.2
MFZ-KJ18NA
HEAT Dry 470 22.9 33.3
COOL Dry 491 23.9 34.8
Wet 417 20.3 29.7
2. Multi connection
Model Mode Function AirÀow
(CFM)
Air speed
(ft./s.)
Coverage (ft.)
MFZ-KJ09NA
MFZ-KJ12NA
HEAT Dry 343 16.7 24.5
COOL Dry 275 13.4 19.8
Wet 234 11.4 16.9
MFZ-KJ15NA
MFZ-KJ18NA
HEAT Dry 470 22.9 33.3
COOL Dry 374 18.2 26.7
Wet 318 15.5 22.8
(2) OPERATION
Mode Condition
Intake air temperature (°F)
Indoor Outdoor
DB WB DB WB
Cooling
Standard temperature 80 67 95 —
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Heating
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 -13 -14
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage Guaranteed voltage (V)
Indoor unit
208/230 V
1 phase
60 Hz
Min. 187 208 230 Max. 253
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4OUTLINES AND DIMENSIONS
MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA Unit: inch
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MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA
5WIRING DIAGRAM
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MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA
Unit: inch (mm)
6REFRIGERANT SYSTEM DIAGRAM
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12, RT14,
RT15
(main)
RT13 (sub)
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe 3/8 ( 9.52) (MFZ-KJ09/12)
1/2 ( 12.7) (MFZ-KJ15/18)
(with heat insulator)
Refrigerant pipe 1/4 ( 6.35)
(with heat insulator)
Distributor
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SERVICE FUNCTIONS
7
7-1. 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 9-7.)
• 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 3
seconds. Restarting the compressor, which takes 3 minutes, cannot be reduced.
MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA
1. How to modify the electronic control P.C. board
Turn OFF the power supply before modification. To assign a number to each indoor unit , cut off “JR05” and “JR06” on the
electronic control P.C. board as shown in Table 1. (Refer to 9-7.)
Unit No. 1
Unit No. 2
Unit No. 3
Unit No. 4
JR05
No modification
Cut off JR05
No modification
Cut off JR05
JR06
No modification
No modification
Cut off JR06
Cut off JR06
Table 1
CN211
Fuse (F11)
VARISTOR (NR11)
Indoor electronic
control P.C. Board
CN151
JR05
JR06
R111
7-2. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
To operate the indoor units individually with each remote controller, assign a number to each remote controller according
to the number of the indoor unit.
This setting can be set only when all the following conditions are met:
• The remote controller is powered OFF.
• Weekly timer is not set.
• Weekly timer is not being edited.
2. How to set the remote controller
(1) Hold down button on the remote controller for 2 seconds to enter the pairing mode.
(2) Press button again and assign a number to each remote controller.
Each press of button advances the number in the following order: 1 ĺ2 ĺ3 ĺ4.
(3) Press button to complete the pairing setting.
After the setting, turn ON the power supply and with the remote controller headed towards the indoor unit, press the
STOP/OPERATE (OFF/ON) button. If 1 or 2 beeps are heard from the indoor unit, the setting is completed correctly.
The remote controller that first sends a signal to an indoor unit will be regarded as the remote controller for the indoor
unit.
Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.
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CN123
CN105
CN104
CN111
CN211
T111
C111
L101
CN201 F11
JR77
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 cur-
rent by adding to the system that allows the units to start one by one.
7-3. 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 9-7.)
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WIRELESS REMOTE CONTROLLER
MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA
MICROPROCESSOR CONTROL
8
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.
Signal transmitting section
Operation display section
TEMPERATURE buttons
STOP/OPERATE
(OFF/ON) button
Indication of
remote controller
model is on back
Distance of signal :
About 20 ft. (6 m)
Beep(s) is (are) heard from
the indoor unit when the
signal is received.
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
CLOCK button
Lid
Slide the lid down
to open the remote
controller. Slide it down
further to get to the
weekly timer buttons.
WEEKLY TIMER
set buttons
TIME, TIMER set buttons
FORWARD button
BACKWARD button
RESET button
SMART SET button
SLEEP button VANE CONTROL button
POWERFUL button
INDOOR UNIT DISPLAY SECTION
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 4 °F (2°C) or more
away from set tempera-
ture
The room temperature is
approaching the set tem-
perature
About 2 to 4 °F (1 to 2°C)
from set temperature
Standby mode (only during
multi system operation) —
Lighted
Blinking
Not lighted
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8-1. 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 TEMP or button to select the desired temperature. The setting range is 61 - 88°F (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.
3. Indoor fan speed control
When the thermostat turns OFF, the indoor fan operates at the setting fan speed.
8-2. 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. (8-1.1.)
2. Low outside temperature operation
Low outside temperature operation works the same way as that in COOL mode. (8-1.2.)
3. Indoor fan speed control
Indoor fan speed control works the same way as that in COOL mode. (8-1.3.)
However in AUTO setting, the fan speed changes.
8-3. 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.
NOTE: Temperature cannot be set during FAN mode.
8-4. HEAT ( ) OPERATION
(1) Press STOP/OPERATE (OFF/ON) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons TEMP or button to select the desired temperature. The setting range is 61 - 88°F (16
- 31°C).
1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem-
perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2. High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con-
densing pressure from increasing excessively.
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.
This mode continues until the temperature of indoor heat exchanger falls.
3. Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts.
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
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8-5. AUTO CHANGE OVER ··· AUTO MODE OPERATION
Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.
1. Mode selection
(1) Initial mode
At first indoor unit operates only indoor fan with outdoor unit OFF for 3 minutes to detect present room temperature.
Following the conditions below, operation mode is selected.
If the room temperature thermistor RT11 reads more than set temperature, COOL mode is selected.
If the room temperature thermistor RT11 reads set temperature or less, HEAT mode is selected.
(2) Mode change
In case of the following conditions the operation mode is changed.
COOL mode changes to HEAT mode when 15 minutes have passed with the room temperature 4 °F (2 degrees C)
below the set temperature.
HEAT mode changes to COOL mode when 15 minutes have passed with the room temperature 4 °F (2 degrees C)
below the set temperature.
In the other cases than the above conditions, the present operation mode is continued.
NOTE 1: Mode selection is performed when multi standby (refer to NOTE 2) is released and the unit starts operation
with ON-timer.
NOTE 2: If 2 or more indoor units are operating in multi system, there might be a case that the indoor unit, which is
operating in AUTO ( ), cannot change over the other operating mode (COOL ļHEAT) and becomes a state
of standby.
NOTE 3: At the beginning of AUTO mode, the air flow direction and the fan speed are set to AUTO and the air outlet
selection is set to 2 FLOW.
8-6. AUTO VANE OPERATION
1. Horizontal vane (Horizontal vane/Multi-flow vane)
(1) Vane motor drive
These models are equipped with a stepping motors for the horizontal vanes. The rotating direction, speed, and angle
of the motor are controlled by pulse signals (approximately 12 VDC) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL ( ) button.
(AUTO) (2) (3) (4)(1) (SWING)
(4) Air outlet selection
The air outlet(s) can be selected by pressing to VANE CONTROL ( ) button.
When 2 FLOW is selected, air blows from the top and the front of the unit. When 1 FLOW is selected, air blows only
from the top of the unit.
(2 FLOW) (1 FLOW)
(3) Positioning
The vane presses the vane stopper once to confirm the standard position and then moves to the set angle.
Confirming of standard position is performed in case of follows.
(a) The power supply turns on.
(b) The operation starts or finishes (including timer operation).
(c) The test run starts.
(d) The multi-standby starts or finishes.
(e) Every time the vane has swung more than the specified numbers of times.
(f ) The horizontal vane automatically moves in certain intervals to determine its position, and then it returns to
set position.
(g) The vane operates for the dew prevention.
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In COOL, DRY and FAN operation
2 FLOW: Vane angle is fixed to position 2.
In HEAT operation
2 FLOW: Vane angle is fixed to position 2.
(5) VANE AUTO ( ) mode
In VANE AUTO mode, the microprocessor automatically determines the horizontal vane angle to make the optimum
room temperature distribution.
The multi-flow vane is automatically set to the appropriate position.
In HEAT, the multi-flow vane automatically changes its position according to the indoor fan speed.
Even if 2 FLOW is selected, air will blow only from the top of the unit in the following conditions:
• During COOL/DRY: The room temperature is close to set temperature.
The air conditioner has operated for 0.5 to 1 hour.
• During HEAT: The air flow temperature is low. (During defrosting operation, start of operation, etc.)
NOTE:
Movement at the start of the 2 FLOW operation
• COOL/DRY, HEAT: It takes 0.5 to 1 minute to start the 2 FLOW operation.
• HEAT: When cold air blows out from the air outlet, the multi-flow vane may stop moving for up to 10 minutes to
make and blow out warm air.
1 FLOW: Vane angle is fixed to position 1. 1 FLOW: Vane angle is fixed to position 3.
(6) 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.
(7) Dew prevention
During COOL or DRY operation with the vane angle at Angle 3 or 4 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
(8) SWING ( ) mode
By selecting SWING mode with VANE CONTROL button, the horizontal vanes swing vertically.
The remote controller displays " ". SWING mode is cancelled when VANE CONTROL button is pressed once again.
(9) Cold air prevention in HEAT operation
The horizontal vane position is set to Upward.
(
10 ) ECONO COOL ( ) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 4 °F (2°C) higher by
the microprocessor. However, the temperature on the LCD screen on the remote controller is not changed. Also the
horizontal vane swings in various cycle.
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, POWERFUL button.
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(
11 ) POWERFUL ( ) operation
The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL
mode.
The POWERFUL mode is cancelled automatically 15 minutes after operation starts, or when POWERFUL button
is pressed once again within 15 minutes after operation starts. The operation mode returns to the mode prior to
POWERFUL operation. To cancel this operation manually, select a different mode or press one of the following but-
tons within 15 minutes after operation starts: STOP/OPERATE (OFF/ON), ECONO COOL, FAN SPEED CONTROL,
SLEEP or SMART SET button.
8-7. 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 button.
How to set the current time
(a) Press the CLOCK 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.
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8-8. WEEKLY TIMER OPERATION
E.g. : Runs at 75°F (24°C) from waking up to leaving home,
and runs at 81°F (27°C) from getting home to going to
bed on weekdays.
Runs at 81°F (27°C) from waking up late to going bed
early on weekends.
75°F (24°C) 81°F (27°C)
PM 5:30AM 6:00 AM 8:30 PM 10:00
PM 9:00PM 8:00 81°F (27°C)
• A maximum of 4 ON or OFF timers can be set for individual days of the week.
• A maximum of 28 ON or OFF timers can be set for a week.
NOTE:
• The simple ON/OFF timer setting is available while the weekly timer is on. In this case, the ON/OFF timer has priority over the
weekly timer, the weekly timer operation will start again after the simple ON/OFF timer is complete.
• When the weekly timer is set, temperature cannot be set to 50°F (10°C).
• The weekly timer operation and SMART SET operation cannot be used together.
* Make sure that the current time and day are set correctly.
(1) Press button to enter the weekly timer setting mode.
(2) Press and buttons to select setting day and number.
(3) Press , , and buttons to set ON/OFF, time, and temperature.
E.g. : [ON], [AM 6:00] and
[75°F (24°C)] are
selected.
Pressing
selects ON/OFF timer.
Pressing
deletes timer setting.
Pressing
adjusts the time.
Pressing
adjusts the tem-
perature.
* Hold down the button to change the time quickly.
* The temperature can be set between 61°F and 88°F (16°C and 31°C) at weekly timer.
* blinks.
Pressing selects the day of
the week to be set.
Pressing selects
the setting number.
E.g. : [Mon Tue ... Sun]
and [1] are selected.
* All days can be selected.
1. How to set the weekly timer
Press and buttons to continue setting the timer for other days and/or numbers.
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NOTE:
• Press button to transmit the setting information of weekly timer to the indoor unit. Point the remote controller toward the
indoor unit for 3 seconds.
• When setting the timer for more than one day of the week or one number, button does not have to be pressed per each
setting. Press button once after all the settings are complete. All the weekly timer settings will be saved.
• Press button to enter the weekly timer setting mode, and press and hold button for 5 seconds to erase all weekly
timer settings. Point the remote controller toward the indoor unit.
(4) Press button to complete and transmit the weekly timer setting.
* which was blink-
ing goes out, and the
current time will be
displayed.
2. Checking weekly timer setting
2. Checking weekly timer setting
(1) Press button to enter the weekly timer setting mode.
* blinks.
(2) Press or buttons to view the setting of the particular day or number.
(3) Press button to exit the weekly timer setting.
NOTE:
When all days of the week are selected to view the settings and a different setting is included among them, will be
displayed.
(5) Press button to turn the weekly timer ON. ( lights.)
•When the weekly timer is ON, the day of the week whose timer setting is complete, will light.
Press button again to turn the weekly timer OFF. ( goes out.)
NOTE:
The saved settings will not be cleared when the weekly timer is turned OFF.
8-9. SLEEP ( ) OPERATION
1. How to set SLEEP operation
(1) Press STOP/OPERATE (OFF/ON) button.
(2) Select COOL, DRY, HEAT or FAN mode.
(3) Press SLEEP ( ) button.
(4) PRESS TEMPERATURE buttons [ (Increase) and (Decrease) ] to set the temperature of SLEEP
operation.
Fan speed: AUTO
Horizontal vane: Position set on the remote controller
Operation indicator lamp: Dimly lit
• Once the above procedure is completed, the settings will be saved.
• After the settings are saved, a single push of SLEEP ( ) button during operation activates SLEEP operation with the
same settings every time.
• Temperature for SLEEP operation cannot be set during DRY or FAN mode.
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Set temperature for SLEEP operation.
For about 30 minutes after SLEEP ( ) button is pressed, the set temperature remains as set for the operation running
when the SLEEP button is pressed. It will change to the set temperature for SLEEP operation in about 30 minutes.
Pressing SLEEP ( ) button again returns the operation to the previous settings.
is
pressed. is pressed.
For about 30
minutes
Set
temperature for
the operation
before SLEEP
operation
Set temperature for
SLEEP operation
Set temperature for
the operation before
SLEEP operation
NOTE:
• ON/OFF timer is available during SLEEP operation.
• When a preset ON time for the weekly timer arrives during SLEEP operation, the weekly timer operation has priority. SLEEP
operation will be cancelled, and the operation set on the weekly timer will start.
2. How to cancel operation
• Press SLEEP ( ) button again.
• The operation returns to the previous settings.
• SLEEP operation is also cancelled when the FAN button is pressed or the operation mode is changed.
NOTE: SLEEP operation and SMART SET operation cannot be set at same time.
8-10. SMART SET ( ) OPERATION
1. How to set SMART SET operation
(1) Press STOP/OPERATE (OFF/ON) button.
(2) Select COOL, HEAT or ECONO COOL mode.
(3) Press SMART SET button.
(4) Set the temperature, fan speed, and airÀow direction for SMART SET operation.
NOTE:
• SMART SET operation cannot be selected during DRY or AUTO mode operation.
• The setting range of HEAT mode SMART SET operation is 50°F (10°C) and 61 - 88°F (16 - 31°C).
• 2 groups of setting can be saved. (One for COOL/ECONO COOL, one for HEAT)
• SMART SET operation and the weekly timer operation cannot be used together.
• SMART SET operation and SLEEP operation cannot be set at the same time.
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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8-11. 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 missing
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 operation
is for servicing. The indoor fan runs at High speed and the temperature
control does not work. In COOL/HEAT MODE, the air outlet selection is
set to 2 FLOW during the test run operation. However, 2 FLOW opera-
tion in HEAT MODE is the same operation as the case that 2 FLOW
operation is selection by the remote controler.
After 30 minutes of test run operation, the system shifts to
EMERGENCY COOL/HEAT MODE with a set temperature of
75°F
(24°C).
The fan speed shifts to Medium.
In EMERGENCY COOL/HEAT MODE, the air outlet selection is set to
2 FLOW. 2 FLOW operation is the same operation as the case that 2
FLOW operation is selection by the remote controler.
The coil frost prevention works even in the test run or the emergency
operation.
In the test run or emergency operation, the horizontal vane operates in
VANE AUTO ( ) mode.
Emergency operation continues until EMERGENCY OPERATION switch
is pressed once or twice or 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.
8-12. 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.
8-13. Changing temperature indication (°F/°C)
• The preset unit is °F.
• °F ĺ°C: Press RESET button while the TEMPERATURE buttons are pressed.
• °C ĺ°F: Press RESET button while the TEMPERATURE buttons are pressed.
Press RESET button gently
using a thin instrument.
Operation mode COOL/HEAT
Set temperature 75°F (24°C)
Fan speed Medium
Horizontal vane Auto
Air outlet 2 FLOW
The operation mode is indicated by the Operation
Indicator lamp as following
Operation Indicator lamp
EMERGENCY COOL
Ļ
EMERGENCY HEAT
Ļ
STOP
Lighted
Not lighted
Emergency
operation switch
(E.O. SW)
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