MITSUBISHI ELECTRIC MSZ-EF09NAW Designer Wall Mounted Indoor Unit Owner’s Manual

MSZ-EF09NAW – U1 MSZ-EF09NAB – U1 MSZ-EF09NAS – U1
1. New model

MSZ-EF12NAW – U1 MSZ-EF12NAB – U1 MSZ-EF12NAS – U1

MSZ-EF15NAW – U1 MSZ-EF15NAB – U1 MSZ-EF15NAS – U1

MSZ-EF09NAW – U1 MSZ-EF09NAB – U1 MSZ-EF09NAS – U1 MSZ-EF12NAW – U1 MSZ- EF12NAB – U1 MSZ-EF12NAS – U1 MSZ-EF15NAW – U1 MSZ-EF15NAB – U1 MSZ-EF15NAS – U1 MSZ-EF18NAW – U1 MSZ-EF18NAB – U1 MSZ-EF18NAS – U1
1. Model name has been changed.
OBH736C

MSZ-EF09NAW – U2 MSZ-EF09NAB – U2 MSZ-EF09NAS – U2 MSZ-EF12NAW – U2 MSZ- EF12NAB – U2 MSZ-EF12NAS – U2 MSZ-EF15NAW – U2 MSZ-EF15NAB – U2 MSZ-EF15NAS – U2 MSZ-EF18NAW – U2 MSZ-EF18NAB – U2 MSZ-EF18NAS – U2
2

MSZ-EF18NAW – U1 MSZ-EF18NAB – U1 MSZ-EF18NAS – U1

2 PART NAMES AND FUNCTIONS

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

Front panel
Air filter (Nano platinum filter) Air cleaning filter (Electrostatic anti- allergy enzyme filter)
Air inlet

Horizontal vane Air outlet Heat exchanger
Operation indicator lamp

Emergency operation switch
Remote control receiving section

ACCESSORIES

Remote controller

Model

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ- EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

Installation plate

1

Installation plate fixing screw 4 × 25 mm

5

Remote controller holder

1

Fixing screw for 3.5 × 16 mm (Black)

2

Battery (AAA) for remote controller

2

Wireless remote controller

1

Felt tape (For left or left-rear piping)

1

Soft dry cloth (NAB type only)

1

Air cleaning filter

2

OBH736C

3

3 SPECIFICATION

Indoor unit model

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ- EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

Power supply

V, phase, Hz

208/230 , 1 , 60

Disconnect switch

A

15

Min. circuit ampacity

A

1.0

Fan motor

F.L.A

0.67

Airflow

COOL Dry (Wet)

CFM

371 – 293 – 222 – 162 – 141 371 – 293 – 222 – 162 – 141 364 – 314 – 272 – 233 – 205 388 – 328 – 279 – 240 – 205 (319 – 252 – 191 – 140 – 121) (319 – 252 – 191 – 140 – 121) (313 – 270 – 234 – 200 – 176) (334 – 282 – 240 – 206 – 176)

Super high – High – Med. – Low – Quiet HEAT Dry CFM 420 – 314 – 219 – 162 – 141 448 – 314 – 219 – 162 – 141 448 – 350 – 275 – 222 – 194 466 – 392 – 318 – 258 – 226

Moisture removal

Sound level

Cooling

Super high – High – Med. – Low – Quiet Heating

Cond. drain connection O.D.

W

Dimensions

D

H

Weight

pt./h

0.6

2.1

3.6

4.4

dB(A) 42 – 36 – 29 – 23 – 21 42 – 36 – 29 – 24 – 21 42 – 39 – 35 – 31 – 28 43 – 40 – 36 – 33 – 30

dB(A) 45 – 37 – 29 – 24 – 21 46 – 38 – 30 – 24 – 21 48 – 41 – 35 – 30 – 28 49 – 43 – 37 – 33 – 30

in.

5/8

34-13/16

in.

7-11/16

11-3/4

Ib.

26

External finish

W: Munsell 1.0Y 9.2/0.2 B: Munsell 3.7PB 2.0/0.1
S: Munsell 3.1PB 8.2/0.2

Remote controller Control voltage (by built-in transformer) NOTE: Test conditions are based on AHRI 210/240.

Wireless type 12 – 24 V DC

3-1. OPERATING RANGE (1) POWER SUPPLY

Rated voltage

Indoor unit

208/230 V 1 phase 60 Hz

(2) OPERATION

Mode

Condition

Standard temperature

Cooling

Maximum temperature Minimum temperature

Maximum humidity

Standard temperature

Heating Maximum temperature

Minimum temperature

Guaranteed voltage (V) Min. 187 208 230 Max. 253

Intake air temperature (°F)

Indoor

Outdoor

DB

WB

DB

WB

80

67

95

—

90

73

115

—

67

57

14

—

78%

—

70

60

47

43

80

67

75

65

70

60

-13

-14

OBH736C

4

3-2. OUTLET AIR SPEED AND COVERAGE

Model

Mode

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS
MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS
MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS
MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

HEAT COOL HEAT COOL HEAT COOL HEAT COOL

Function
Dry Dry Wet Dry Dry Wet Dry Dry Wet Dry Dry Wet

Airflow (CFM)
420 371 319 448 371 319 448 364 313 466 388 336

Air speed (ft./s) 19.5 17.2 15.5 20.8 17.2 15.5 20.8 16.8 15.2 21.6 20.3 18.3

Coverage (ft.) 29.2 25.8 23.3 31.1 25.8 23.3 31.1 25.4 22.9 32.3 30.4 27.4

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 position. The coverage should be used only as a general guideline since it varies according to the size of the room and furniture arranged inside the room.

OBH736C

5

4 OUTLINES AND DIMENSIONS

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

34-13/16 34-7/16

2-1/4 or more
In case of left, left back,or left under piping (using spacer), 4-3/8 or more.

3/16 7-11/16

1 or more

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS
7/16 × 1 Oblong hole Installation plate
3-1/4
3/16

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

Unit: inch

8-7/8

8-7/8

7/16 × 13/16 Oblong hole 3-1/4

7/8

10

9-1/8

8-3/8

9-3/16

10-1/16

1-3/4

Indoor unit 2-7/16
1-3/8 or more

1-3/4

7-1/16 14-15/16
Air in

7-1/16

14-1/2

2-15/16 Wall hole 2-15/16

Installation plate

Piping

1/4

11-3/4 3-15/16 1/4

2-13/16 9-13/16

1-7/8 2-3/8

(2-1/8) 11/16

1/4 or more

26-11/16

6

Air out

(80 )

2-3/16 3-11/16 4-5/16

2-5/16

Drain hose

2-3/16

7-5/8 1-15/16

2-13/16

3-3/8

MSZ-EF09/12NA

MSZ-EF15/18NA

OBH736C

6

5 WIRING DIAGRAM

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

OBH736C

7

6 REFRIGERANT SYSTEM DIAGRAM

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS
Unit: inch (mm)

Indoor heat exchanger

Refrigerant pipe ø3/8 (ø9.52) (MSZ-EF09/12) ø1/2 (ø12.7) (MSZ-EF15/18)
(with heat insulator)

Indoor coil thermistor RT12 (main)

Flared connection

Indoor coil thermistor RT13 (sub)

Room temperature thermistor RT11

Flared connection

Refrigerant pipe ø1/4 (ø6.35) (with heat insulator)
Refrigerant flow in cooling Refrigerant flow in heating

OBH736C

8

7 SERVICE FUNCTIONS

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

7-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging JPG and JPS 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 minutes. · After the breaker is turned on, the time for starting the compressor, which normally takes 3 minuets, can be reduced to 3 seconds. Restarting the compressor, which takes 3 minuets, cannot be reduced.

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.

(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 2 3 4.

(3) Press

button to complete the pairing setting.

After you turn the breaker ON, 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.

OBH736C

9

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.)
Indoor electronic control P.C. board
IC171
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 cancelled. · 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.

CN112 CN104 BZ

OBH736C

10

8 MICROPROCESSOR CONTROL

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

WIRELESS REMOTE CONTROLLER
Signal transmitting section

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

Operation display section Temperature buttons

Operation select button ECONO COOL button
SMART SET button OFF/ON (stop/operate) button
Indication of remote controller model is on back

FAN speed control button VANE control button
TIME, TIMER set buttons forward button backward button
WEEKLY TIMER set buttons
RESET button CLOCK SET button

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.

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 About 4°F (2°C) or more reach the set temperature away from set temperature

The room temperature is approaching the set temperature
Standby mode (Only during multi system operation)

About 2 to 4°F (1 to 2°C) from set temperature
–

Lit Blinking Not lit

OBH736C

11

8-1. COOL ( ) OPERATION (1) Press OFF/ON (stop/operate) 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 very Low to reduce power consumption. When the room temperature rises and the thermostat is ON, the indoor fan operates according to the settings on the remote controller.
8-2. DRY ( ) OPERATION (1) Press OFF/ON (stop/operate) 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.)
8-3. FAN ( ) OPERATION (1) 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.
8-4. HEAT ( ) OPERATION (1) Press OFF/ON (stop/operate) 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 temperature 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 condensing pressure from increasing excessively. When the temperature of indoor heat exchanger becomes too high, the high pressure protection works. The indoor fan operates following the cold air prevention control. 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.

OBH736C

12

8-5. AUTO CHANGE OVER AUTO MODE OPERATION Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation. Mode selection (1) Initial mode When unit starts the operation with AUTO operation from OFF: · If the room temperature is higher than the set temperature, operation starts in COOL mode. · If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode. (2) Mode change COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2°F (1°C) below the set temperature. HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2°F (1°C) above the set temperature. NOTE 1 If two 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 to the other operating mode (COOL HEAT) and becomes a state of standby. Refer to NOTE 2 “FOR MULTI SYSTEM AIR CONDITIONER”. NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT: MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit.
· When you try to operate 2 or more indoor units with one outdoor unit simultaneously, one for the cooling and the others for heating, the operation mode of the indoor unit that operates first is selected. Other indoor units cannot operate, and operation indicator lamp blinks as shown in the figure below. In this case, please set all the indoor units to the same operation mode.
OPERATION INDICATOR

Lit Blinking Not lit

· When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 10 minutes) to blow out the warm air.
· In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing
may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

8-6. AUTO VANE OPERATION
1. Horizontal 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 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE control button.

AUTO

1

2

3

4

5

SWING

(3) Positioning To confirm the standard position, the vane move 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. (c) When standby mode (only during multi system operation) starts or finishes.

OBH736C

13

(4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tem-
perature distribution.

In COOL and DRY operation Vane angle is fixed to Horizontal position.

In HEAT operation Vane angle is fixed to Angle 4.

Horizontal position
4
(5) STOP (operation OFF) and ON TIMER standby In the following cases, the horizontal vane returns to the closed position. (a) When OFF/ON (stop/operate) 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 vanes swing vertically. When COOL, DRY or FAN mode is selected, only the upper vane swings.
(8) Cold air prevention in HEAT operation The horizontal vane position is set to upward. NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off, this control does not work in the indoor unit.
(9) 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 or VANE control button.

OBH736C

14

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 “12:00 AM” 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 OFF/ON (stop/operate) 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 button ( )
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.

PROGRAM TIMER

· 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.

(Example 1) The current time is 8:00 PM.

(Example 2) The current time is 11:00 AM.

The unit turns off at 11:00 PM, and on at 6:00 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 cancelled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer cancelled when power is restored.

OBH736C

15

8-8. WEEKLY TIMER OPERATION
· 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.
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)

AM 6:00

AM 8:30

81°F (27°C)

PM 5:30

PM 10:00

81°F (27°C)

PM 8:00

PM 9:00

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 can not be set to 50°F (10°C). · The weekly timer operation and SMART SET operation cannot be used together.

1. How to set the weekly timer

• Make sure that the current time and day are set correctly.

(1) Press

button to enter the weekly timer setting mode.

blinks.

(2) Press

and

buttons to select setting day and number.

E.g. : [Mon Tue … Sun] and [1] are selected.

Pressing

selects the day of

the week to be set.

Pressing

selects

the setting number.

• All days can be selected.

(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

Pressing

Pressing deletes timer setting.

adjusts the time.

adjusts the temperature.

• 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.

Press

and

buttons to continue setting the timer for other days and/or numbers.

OBH736C

16

(4) Press

button to complete and transmit the weekly timer setting.

which was blink-

ing goes out, and the

current time will be

displayed.

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.

(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.

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, displayed.

will be

OBH736C

17

8-9. SMART SET ( ) OPERATION
1. How to set SMART SET operation (1) Press OFF/ON (stop/operate) button. (2) Select COOL, HEAT or ECONO COOL mode. (3) Press SMART SET button. (4) Set the temperature, fan speed, and airflow direction for SMART SET operation. NOTE:
· Select the appropriate temperature, fan speed, and airflow direction according to your room. · 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.
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 preferred setting can be saved for the next time with a single press of SMART SET button.
· SMART SET operation cannot be set on the weekly timer.

8-10. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use the 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. 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 Med.. 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 the 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 the emergency operation switch during normal operation.

Operation mode Set temperature
Fan speed Horizontal vane

COOL/HEAT 75°F (24°C)
Med. Auto

The operation mode is indicated by the Operation Indicator lamp as follows.

Operation Indicator lamp
EMERGENCY COOL

EMERGENCY HEAT

STOP

Lit Not lit

Emergency operation switch (E.O. SW)

8-11. 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.
8-12. Changing temperature indication (°F/°C) · The preset unit is °F. · °F °C: Press RESET button while the temperature
buttons are pressed. · °C °F: Press RESET button or remove the batteries .
Press RESET button gently using a fine-tipped object.

OBH736C

18

9 TROUBLESHOOTING

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

9-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board. 3) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components. 4) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires.