Mitsubishi Electric Mr. Slim MSZ-FD09NA User manual

SERVICE MANUAL
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·····································22
10. DISASSEMBLY INSTRUCTIONS····················36
MSZ-FD09NA
MSZ-FD12NA
No. OBH497
REVISED EDITION-C
SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
Outdoor unit service manual
MUZ-FD•NA Series (OBH498)
MXZ-A·NA Series (OB444)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB497)
Revision C:
• 3. SPECIFICATION has been corrected.
Please void OBH497 REVISED EDITION-B.
Models

2
Revision A:
• 3. SPECIFICATION has been corrected.
Revision B:
• 3. SPECIFICATION has been corrected.
Revision C:
• 3. SPECIFICATION has been corrected.

3
1TECHNICAL CHANGES
MSZ-FD09NA
MSZ-FD12NA
1. New model.

4
PART NAMES AND FUNCTIONS
2
MSZ-FD09NA MSZ-FD12NA
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
Remote control
receiving section
AREA lamp POWER lamp
Fan
Remote controller
ACCESSORIES
Installation plate 1
Installation plate fixing screw 4 × 25 mm 5
Remote controller holder 1
Fixing screw for 3.5 × 1.6 mm (Black) 2
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (Used for left or left-rear piping) 1
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”).

5
3SPECIFICATION
Indoor model MSZ-FD09NA MSZ-FD12NA
Power supply V, phase, Hz 208/230 , 1 , 60
Max. fuse size (time delay)/ Disconnect switch A15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airflow
Low - Med. - High - Powerful
COOL Dry
(Wet)
CFM 162 - 226 - 339 - 381
(144 - 202 - 307 - 343)
162 - 226 - 381 - 410
(144 - 202 - 350 - 367)
HEAT Dry CFM 166 - 240 - 367 - 381 166 - 240 - 399 - 420
Moisture removal pt./h 2.1 2.9
Sound level
Low - Med. - High - Powerful
Cooling dB(A) 22 - 31 - 39 - 42 22 - 33 - 43 - 45
Heating dB(A) 22 - 31 - 40 - 42 22 - 33 - 43 - 44
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
31-13/32
D 10-1/8
H 11-5/8
Weight Ib. 27
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 ARI 210/240.

6
3-2. OUTLET AIR SPEED AND COVERAGE
●The air coverage is the figure up to the
position where the air speed is 1 ft./
sec., 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 5
15 (- Umodel) 4
14 (- Umodel)
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./sec.)
Coverage (ft.)
MSZ-FD09NA
HEAT Dry 381 19.2 27.7
COOL Dry 339 17.1 24.7
Wet 307 15.5 22.4
MSZ-FD12NA
HEAT Dry 420 21.2 30.4
COOL Dry 381 19.2 27.7
Wet 350 17.6 25.4

7
4OUTLINES AND DIMENSIONS
Unit: inch
MSZ-FD09NA MSZ-FD12NA
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

8
5WIRING DIAGRAM
MSZ-FD09NA MSZ-FD12NA

9
REFRIGERANT SYSTEM DIAGRAM
6
MSZ-FD09NA MSZ-FD12NA
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)

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-FD09NA MSZ-FD12NA
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