Mitsubishi Electric Mr.Slim MUZ-FE NA Series User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES······································· 2
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 5
4. OUTLINES AND DIMENSIONS ························ 6
5. WIRING DIAGRAM············································ 7
6. REFRIGERANT SYSTEM DIAGRAM ··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING····································· 22
10. DISASSEMBLY INSTRUCTIONS···················· 36
MSZ-FE09NA
MSZ-FE12NA
MSZ-FE18NA
SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
Outdoor unit service manual
MUZ-FE•NA Series (OBH543)
MXZ-A·NA Series (OB444)
MXZ-B·NA Series (OB560)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB542)
Models
MSZ-FE09NA
MSZ-FE12NA
No. OBH542
REVISED EDITION-B
MSZ-FE09NA - 8
MSZ-FE12NA - 8
Revision B:
• MSZ-FE09NA - 8and MSZ-FE12NA - 8have
been added.
Please void OBH542 REVISED EDITION-A.
MITSUBISHI
ELECTRIC
Changes for the Better
D
CJ
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2
1TECHNICAL CHANGES
MSZ-FE09NA
MSZ-FE12NA
MSZ-FE18NA
1. New model
Revision A:
• MSZ-FE18NA has been added.
Use the specified 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 B:
• MSZ-FE09NA - 8and MSZ-FE12NA - 8have been added.
MSZ-FE09NA MSZ-FE09NA - 8
MSZ-FE12NA MSZ-FE12NA - 8
1. These models have been modified to be compatible with Honeywell remote controller.
2. Indoor electronic controll P.C. board has been changed.
D
➔
➔
D
D
D

3
PART NAMES AND FUNCTIONS
2
MSZ-FE09NA MSZ-FE12NA
Front panel
Air filter
Air inlet
Operation indicator
lamp
Platinum deodorizing filter
Anti-allergy Enzyme Filter
Air outlet
Horizontal vane
i-see Sensor
Heat exchanger
Emergency operation switch (E.O. SW)
Remote control
receiving section
AREA lamp POWER lamp
Fan
Remote controller
Display section
AREA lamp indicates AREA setting
In AREA setting, the horizontal air
flow direction changes automatically
according to the detection of i-see
Sensor which detects the floor/wall
temperature to air-condition the room
evenly.
i-see control operation
i-see Sensor constantly measure
floor/wall temperature to automatically
adjust to the set temperature by
estimating the temperature actually
perceived by a person inside the room
(“sensible temperature”).
□

4
Remote controller
Display section
Front panel
Air filter
(Nano platinum filter)
Air inlet
Air cleaning filter
(Electrostatic anti-alergy
enzyme filter)
Air outlet
Horizontal vane
Heat exchanger
MSZ-FE18NA
ACCESSORIES
Models MSZ-FE09/12NA MSZ-FE18NA
Installation plate 1 1
Installation plate fixing screw 4 × 25 mm 5 7
Remote controller holder 1 1
Fixing screw for 3.5 × 1.6 mm (Black) 2 2
Battery (AAA) for remote controller 2 2
Wireless remote controller 1 1
Felt tape (Used for left or left-rear piping) 1 1
Air cleaning filter
- 2
( )
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5
3SPECIFICATION
Indoor model MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA
Power supply V, phase, Hz 208/230 , 1 , 60
Max. fuse size (time delay)/ Disconnect switch A15 20
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airflow
Powerful - High - Med. - Low
COOL Dry
(Wet)
CFM 381 - 339 - 226 - 162
(343 - 307 - 202 - 144)
410 - 381 - 226 - 162
(367 - 350 - 202 - 144)
738 - 628 - 469 - 388
(661 - 562 - 420 - 347)
HEAT Dry CFM 381 - 367 - 240 - 166 420 - 399 - 240 - 166 738 - 628 - 469 - 388
Moisture removal pt./h 2.1 2.9 2.7
Sound level
Powerful - High - Med. - Low
Cooling dB(A) 42 - 39 - 31 - 22 45 - 43 - 33 - 22 53 - 49 - 41 - 34
Heating dB(A) 42 - 40 - 31 - 22 44 - 43 - 33 - 22 52 - 49 - 41 - 32
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
31-3/8 43-5/16
D 10-1/8 9-3/8
H 11-5/8 12-13/16
Weight Ib. 27 37
External finish Munsell 1.0Y 9.2/0.2
Remote controller Wireless type
Control voltage (by built-in transformer) 12 - 24 VDC
NOTE: Test conditions are based on AHRI 210/240.
3-2. OUTLET AIR SPEED AND COVERAGE
 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.
(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 -15
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
Model Mode Function Airflow
(CFM)
Air speed
(ft./s)
Coverage (ft.)
MSZ-FE09NA
HEAT Dry 381 19.2 27.7
COOL Dry 339 17.1 24.7
Wet 307 15.5 22.4
MSZ-FE12NA
HEAT Dry 420 21.2 30.4
COOL Dry 381 19.2 27.7
Wet 350 17.6 25.4
MSZ-FE18NA
HEAT Dry 738 18.0 36.9
COOL Dry 738 18.0 36.9
Wet 661 16.1 33.2
□~-------
-------+-I --+----+--+I-------

6
4OUTLINES AND DIMENSIONS
Unit: inch
MSZ-FE09NA MSZ-FE12NA
30-7/8
31-3/8
1/2
1-7/8
2-3/16
11-5/8
27-1/16
3/4
2-5/16
6-1/4
1-11/16
2-11/16
2-3/16
3-15/16
1/2
10-1/8 1/4 Installation plate
Piping
2-3/16
Drain hose
1-11/16
3-3/8
3-13/16
Air out
Indoor unit 2-1/8
1-5/8
2-1/2
Installation plate
7/16 X 1 Oblong hole
8-7/8 8-7/8
8-3/8
10
13-9/16 13
6-1/8 6-1/8
Wall hole ø2-9/16
2-11/16
1/8
1-5/8
8-5/16
9-1/8
9-15/16
7/8
2-1/2
7/16 X 13/16 Oblong hole
ø1-3/8 O.D
ø1/4 19-11/16 (Flared connection ø1/4)
ø3/8 16-15/16 (Flared connection ø3/8)
Insulation ø1-1/8 O.D Connected part ø5/8 O.D
Air in
Piping
Insulation
Liquid line
Gas line
Drain hose
MSZ-FE18NA
42-7/8 3/16
43-5/16
1-3/4 9-3/8
10-3/16
1/8
11
8-7/8 8-7/8
5-1/16
9-7/16
11-1/16
1-3/4
1-15/16 19-3/4 17-5/16
7-27/327-27/32
4-3/8
2-9/16
2-1/2
3 33-1/8 7-1/8
2-9/16
2-9/16
1-3/16
2-1/2
2-9/16
2-5/8
2-1/2
12-13/16
1/8
3-15/16
4-7/8
6-5/16
4-5/16
( 70° )
9-3/8
3/16
8-1/4
27/32
7-1/4
1/2
Piping
Insulation Ø2 O.D
Liquid line Ø3/8 19-11/16 (Flared connection Ø3/8)
Gas line Ø1/2 16-15/16 (Flared connection Ø5/8)
Drain hose Insulation Ø1-1/8 Connected part Ø5/8 O.D
Air out
Piping
Drain hose
7/16×1 Oblong hole 7/16×3/4 Oblong hole
Installation plate
Indoor unit
Wall hole
Ø 3
Air in Installation plate
3/4
6-1/4
2-5/16
□
I I

7
5WIRING DIAGRAM
MSZ-FE09NA MSZ-FE12NA
□ ~------____J
LDI051Sl
SW P, C. BOARD
LDI051Tl
* A disconnect should be
required by local code.
SYMBOL NAME SYMBOL NAME
□ Bill
DIODE STACK
NRll
VARISTOR
Fll
FUSE
RTll
ROOM TEMP.
IT3. 15Al.25OVl
THERMISTOR
HF
FAN MOTOR
RT12
COIL TEt-1'.
THERMISTOR 11/AINl
HT
i-see Sensor
RT13
COIL TEt-1',
f,fJTOR
THERMISTOR ISUBl
MVl
VANE f,fJTOR
Tlll TRANSFORMER
lllJRIZONTAU
MV2
VANE MOTOR
TB TERMINAL BLOCK
IVERTICAU
INDOOR ELECTRONIC CONTROL P. C. BOARD
MT MVl
NOTES: 1. Abo LI t t he o LI t do or si de eIectric wiring
refer to the outdoor unit electric wiring
diagram for servicing,
2. Use copper conductors only.
!For field wiring!
lSYmbols below indicatL
ITIJ: Terminal block
1°
000
1: Connector
MV2 MV2

8
MSZ-FE18NA
MSZ-FE09NA - 8MSZ-FE12NA - 8
D
SYHB □ L
NAME
SYHB □ L
NAME
F11
FUSE
R111
RESISTOR
na. 15AL250VJ
HF
FAN H □ T □ R
RT11
R □□ H TEMP.
THERHIST □ R
HT
i-see Sensor
RT12
COIL TEM',
~TOR
THERMISTOR <HA!Nl
MV!
VANE MOTOR
RT13
COIL TEM'.
UOIIZONTAll THERMISTOR <SUBJ
MV2
VANE MOTOR
TIil TRANSFORMER
<VERTICAll
NR11
VARISTOR
TB TERHINAl BlOCK
NOTES:l.About the outdoor side electric wiring
refer to the outdoor unit electric wiring
diagram for servicing.
D
1°
000
1: Connector
2. Use copper conductors only. !For field wiring)
3,Symbols indicate. ITIIJ: Terminal block
100001 : Connector
* A disconnect should be
required by local code.
SYMBOL NAME
Fil
FUSE
IT3, 15AL250VJ
MF FAN MOTOR
MVI
VANE MOTOR
IHORIZONTALl
MV2
VANE MOTOR
IVERTICALJ
NR11 VARISTOR
R111 RESISTOR
RT11
ROOM TEMP,
THERMISTOR
RT12
COIL TEMP.
THERMISTOR IMA!Nl
RT13
COIL TEMP,
THERMISTOR !SUBJ
T111 TRANSFORMER
TB
TERM! NAL BLOCK

9
MSZ-FE09NA MSZ-FE12NA
Refrigerant flow in cooling
Refrigerant flow in heating
Unit: inch
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe 3/8
(with heat insulator)
Refrigerant pipe 1/4
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
MSZ-FE18NA
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø5/8
(with heat insulator)
Refrigerant pipe ø3/8
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
REFRIGERANT SYSTEM DIAGRAM
6
□
\
-----➔
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10
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 9-7.)
Set time: 1-minute 1-second
Set time: 3-minute 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit of JPG and JPS.)
7-2. 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:
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
NOTE: For modification, take out the batteries and
press the OPERATE/STOP (ON/OFF) but-
ton twice or 3 times at first.
After finish modification, put back the bat-
teries then press the RESET button.
J2
J1
MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modification Same as at left Same as at left Same as at left
No. 2 unit — Solder J1 Same as at left Same as at left
No. 3 unit — — Solder J2 Same as at left
No. 4 unit — — — Solder both J1 and 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 has turned OFF, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
7SERVICE FUNCTIONS
□
➔
➔

11
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.
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 release “AUTO RESTART FUNCTION”
Turn off the main power of the unit.
Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)
JR07
CN151 CN211CN112 CN1R1
CN212
CN1T1
CN1U1
CN130
IC156
Area Left Center Right
Where is the indoor unit installed in your room?
(Left) (Center) (Right)
Position of
the slide
switch
Display on
the remote
controller
Installed at left, if the
distance is not more
than 19-3/4 inch (50 cm).
Installed at right, if the
distance is not more
than 19-3/4 inch (50 cm).
NOTE:If the indoor unit is installed more than 19-3/4 inch (50 cm) away from the side walls, cabinets or other nearby
objects, set the slide switch to the “center” position.
Is the indoor unit
installed at right,
left or center?
Slide swich
7-4. REMOTE CONTROLLER (MSZ-FE09NA MSZ-FE12NA)
Be sure to set the slide switch inside the remote controller to an appropriate position according to the installed position of
the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.
MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA
CN111
CN112
CN152
CN10A
Indoor electronic
control P.C. board
JR07
CN151
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®
G)
®
D
D D
□ D
□
D
□
D
□
D
□
D
D
L.C. R
L.C.R L.C.R
~[II I 111 L ~[I I I 111 L
~[I I 111 L
~
~
~

12
Signal transmitting section
Operation display section
OPERATE/STOP
(ON/OFF) button
FAN SPEED CONTROL button
OPERATION SELECT button
POWERFUL button
Indication of
remote controller
model is on back
Temperature buttons
ON TIMER button
CLOCK SET button
TIME SET buttons
FORWARD button
BACKWARD button
OFF TIMER button
RESET button
VANE CONTROL button
WIDE VANE button
AREA button
i-see button
i-see
RESET CLOCK
8MICROPROCESSOR CONTROL
WIRELESS REMOTE CONTROLLER
MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA
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.
MSZ-FE09NA MSZ-FE12NA
MSZ-FE18NA
Signal transmitting section
Operation display section
ON/OFF (operate/
stop) button
FAN SPEED CONTROL button
OPERATION SELECT button
POWERFUL button
Indication of
remote controller
model is on back
Temperature buttons
ON-TIMER button
CLOCK SET button
TIME SET buttons
FORWARD button
BACKWARD button
OFF-TIMER button
RESET button
VANE CONTROL button
WIDE VANE button
ECONO COOL button
□
ON/OFF JB&CDJ8i§'c
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13
8-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
POWER lamp (MSZ-FE09/12NA)/OPERATION INDICATOR lamp (MSZ-FE18NA) 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 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.
8-2. DRY ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
POWER lamp (MSZ-FE09/12NA)/OPERATION INDICATOR lamp (MSZ-FE18NA) 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 is as same as COOL mode. (8-1.1.)
2. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (8-1.2.)
Operation indicator lamp
MSZ-FE09NA MSZ-FE12NA
The lamps at the center of the indoor unit indicates the operation state.
Lamp Operation state
AREA Refer to 8-7.
POWER Lamp lights during operation.
Lamp blinks in abnormal condition.
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
INDOOR UNIT DISPLAY SECTION
MSZ-FE18NA
L---1 ______LI _ __JI
-:+:-
-•-
, ' '
-0.-
,'
-:+:-
0
-•-
,,,
0
-•-
, ' '
-6,:-
Q
6

14
8-3. HEAT ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
POWER lamp (MSZ-FE09/12NA)/OPERATION INDICATOR lamp (MSZ-FE18NA) of the indoor unit turns on with a beep
tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL 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.
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.
8-4. 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.
NOTE1
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 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 earlier is selected. Other indoor units can-
not operate, and operation indicator lamp flashes as shown in the figure below. In this case, please set all the
indoor units to the same operation mode
• 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 flow-
ing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
OPERATION INDICATOR
MSZ-FE09/12NA
L AREA R POWER
MSZ-FE18NA
Lighted
Blinking
Not lighted
0
-0-
,'
0

15
8-5. 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 (approx. 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 operation starts.
(c) When standby mode (only during multi system operation) starts or finishes.
(4) VANE AUTO ( ) mode
The microprocessor automatically determines the vane angle to make the optimum room temperature distribution.
Horizontal
position
In COOL and DRY operation
Vane angle is fixed to Horizontal position.
In HEAT operation
Vane angle is fixed to Angle 4.
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OPERATE/STOP (ON/OFF) 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
MSZ-FE09NA MSZ-FE12NA
During COOL or DRY operation with the vane angle at Angle 3 ~ 5 when the compressor cumulative operation time
exceeds 1 hour or 30 minutes, the vane angle automatically changes to Angle 2 for dew prevention.
MSZ-FE18NA
During COOL or DRY operation with the vane angle at Angle 4 ~ 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
(7) SWING ( ) mode
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.
Horizontal
position
In COOL and DRY operation
Vane angle is fixed to Horizontal
position
In HEAT operation
Vane angle is fixed to Angle 5.
5
MSZ-FE09NA MSZ-FE12NA
MSZ-FE18NA
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16
(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) (MSZ-FE18NA)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher.
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 or POWERFUL button.
(
10 ) POWERFUL ( ) operation
The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode.
The POWERFUL mode is automatically released 15 minutes after operation starts, and the operation mode returns
to the mode prior to POWERFUL operation. To manually cancel this operation, select a different mode or press
POWERFUL /or ECONO COOL(MSZ-FE18NA) button.
2. Vertical vane
(1) Vane motor drive
These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the
motor are controlled by pulse signals (approx. 12 V) transmitted from microprocessor.
(2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.
MSZ-FE09NA MSZ-FE12NA
MSZ-FE18NA
(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 OPERATE/STOP (ON/OFF) button is pressed (POWER ON).
(b) When SWING is started.
(c) When the power supply turns ON.
(4) SWING MODE ( )
By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally.
The remote controller displays “ ”. Swing mode is cancelled when WIDE MODE button is pressed once again.
(SWING)
123 45
61 23 45SWING
(5) WIDE MODE ( ) (MSZ-FE18NA)
By selecting WIDE mode with WIDE VANE button, indoor fan speed becomes faster than setting fan speed on the
remote controller ( ). The remote controller displays “ ”.
NOTE: Indoor fan speed becomes faster than setting fan speed on the remote controller even when or is
selected.
[
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17
8-6. i-see CONTROL OPERATION (MSZ-FE09NA MSZ-FE12NA)
The sensors constantly measure the room and floor/wall temperatures to automatically adjust to the set temperature by esti-
mating the temperature actually perceived by a person inside the room (“sensory temperature”).
Advantages
· The air inside the room is conditioned quickly to a comfortable condition.
· The room will not become too cold or hot even when the air conditioner is kept on for a long period.
· The air conditioner will not overcool or overheat, which means you can save on electricity.
i-see control operation is activated when i-see button is pressed with a thin stick in manual COOL or manual HEAT mode.
NOTE: i-see control operation is activated when the remote controller is first used following replacement of the batteries
or resetting of the remote controller.
i-see control operation is cancelled when i-see button is pressed with a thin stick once again.
NOTE: If the conditioner is turned OFF without cancelling i-see control operation, i-see control operation is activated the
next time the air conditioner is turned ON.
i-see Sensor
i-see Sensor, which is installed on the upper of the air outlet of the indoor unit, is moved with the stepping motor and it
detects the floor/wall temperature.
i-see Sensor is installed here. Enlarged view of i-see Sensor
i-see Sensor
• When AREA setting is not activated, the sensing range of i-see Sensor differs depending on the installation location of
the air conditioner.
Refer to "Remote controller in SERVICE FUNCTIONS".
• Install the front panel correctly after being removed for maintenance or service so that the floor/wall temperatures can
be measured correctly.
Installed at left Installed at center Installed at right
Installation
position
Image of sensing
range
Direction of sensor Right Center Left
8-7. AREA ( ) SETTING (MSZ-FE09NA MSZ-FE12NA)
(1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.
(2) Press i-see button. (NOTE1)
(3) Press AREA button.
Each time the button is pressed, the area is changed in sequence:
(AUTO) (LEFT) (RIGHT) Cancel
i-see Sensor moves intermittently, measuring the floor and wall temperature.
(4) AREA setting is cancelled when the "cancel" is selected by pressing AREA button, or when WIDE VANE button is pressed.
NOTE1: AREA setting is only available during i-see control operation.
NOTE2: If AREA setting is cancelled, the vertical vane returns to the previously set position before AREA setting.
NOTE3:
The horizontal air flow direction (WIDE VANE button), including horizontal SWING, cannot be set during AREA setting
,
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18
Indoor unit installation location and air-conditioning area
·Be sure to set the slide switch inside the remote controller to an appropriate position according to the installed
position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.
(Refer to "Remote controller in SERVICE FUNCTIONS".)
Installed at left Installed at center Installed at right
LEFT RIGHT LEFT RIGHT LEFT RIGHT
To air-condition mainly
the left area of the room
To air-condition the entire room
The horizontal air flow direction and in-
door unit display are switched accord-
ing to the room temperature (floor/wall).
To air-condition mainly
the right area of the room
Remote controller button Press AREA button
to select LEFT. Press AREA button to select AUTO. Press AREA button
to select RIGHT.
i-see Sensor operation
Control range
of horizontal air
flow direction.
The vertical air
flow direction
conforms to the
setting on the
remote controller.
(The horizontal
air flow direction
is controlled in
this range.)
Installed
at center
Installed
at left
Installed
at right
Indoor unit
display AREA
Remote controller display
or or Lighted
Not lighted
L R L R L R L R L R
Ex.) In COOL mode
Moving of horizontal air flow direction
Indoor unit
display
NOTE
Indication of AREA setting
Lighted
Not lighted
• The horizontal air flow direction changes if i-see Sensor detects approx. 5.4 °F(3 °C) temperature difference.
• In AUTO of AREA setting, both right and left lamps are lighted when the room is evenly air-conditioned.
AREA RLAREA RL
AREA RL
The indoor unit delivers cold air detecting the warm area in the room.
Daytime Nighttime
Warm area Cold area
Approx. 150 degrees
●When AREA is set to AUTO
•The vertical vane is controlled to maintain uniform temperature in the whole room.
•The i-see Sensor moves in a range of 150 degrees detecting floor/wall temperature of 3 areas
(left, right, center). Therefore, the detected temperatures may be different from the temperatures
measured on commercial thermometers depending on the condition or temperature
distribution on the floor and/or wall.
•
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19
Operation and operating range
i-see sensor moves 30 degrees from the center in both right and left side.
i-see Sensor operates as follows in accordance with AREA setting made with the remote controller.
“AUTO” in AREA setting: first turning to the LEFT for adjusting the position then ·····
CENTER RIGHT CENTER LEFT CENTER ·····
(The sensor turns to the right, left and center.)
“RIGHT” in AREA setting: first turning to the LEFT for adjusting the position then ·····
CENTER RIGHT CENTER RIGHT CENTER ·····
(The sensor turns to the right and center.)
“LEFT” in AREA setting: first turning to the LEFT for adjusting the position then ·····
CENTER LEFT CENTER LEFT CENTER ·····
(The sensor turns to the left and center.)
The sensor finishes turning to one area to another for 3 seconds and it operates one area for 5 seconds.
i-see Sensor turning to the right
i-see Sensor turning to the center
i-see Sensor turning to the left
8-8. 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 AM” blinks at the current time dis-
play 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 OPERATE/STOP (ON/OFF) 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.
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20
(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 timer of 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.
PM
AM
PM
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.
Emergency
operation switch
(E.O. SW)
8-9. EMERGENCY/TEST OPERATION
In 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, has failed or the batteries of the
remote controller run down. The unit will start and AREA lamp (MSZ-FE09/12NA)/OPERATION INDICATOR lamp (MSZ-
FE18NA) will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing.
The indoor fan runs at High speed and 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.
All protective operations such as 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 case of latter, normal operation will start.
NOTE: Do not press EMERGENCY OPERATION switch during normal operation.
Operation mode COOL HEAT
Set temperature 75°F (24°C) 75°F (24°C)
Fan speed Med. Med.
Horizontal vane Auto Auto
Vertical vane
MSZ-FE09/12NA Straight Straight
The operation mode is indicated by the AREA lamp as following
NOTE:
This is the indication of EMERGENCY OPERATION mode.
AREA setting is not available during EMERGENCY OPERATION.
Lighted
Not lighted
AREA lamp L AREA R
EMERGENCY
COOL
↓
EMERGENCY
HEAT
↓
STOP
MSZ-FE09NA MSZ-FE12NA
MSZ-FE18NA
Emergency
operation switch
(E.O. SW)
EMERGENCY COOL
↓
EMERGENCY HEAT
↓
STOP
Lighted
Not lighted
MSZ-FE09NA MSZ-FE12NA
MSZ-FE18NA
Current Current
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ON IOFF I ON ON
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