Mitsubishi Electric Mr. Slim MSZ-A09NA 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. TROUBLESHOOTING······································11
9. DISASSEMBLY INSTRUCTIONS···················· 25
10. PARTS LIST····················································· 30
10-1. PARTS LIST············································ 30
10-2. RoHS PARTS LIST································· 36
11. MICROPROCESSOR CONTROL···················· 42
No. OB450
REVISED EDITION-D
SPLIT-TYPE AIR CONDITIONERS
MSZ-A09/12/15/17NA
MSY-A15/17NA
INDOOR UNIT
Outdoor unit service manual
MUZ-A·NA, GA·NA Series (OB451)
MUY-A·NA, GA·NA Series (OB451)
MXZ-A·NA Series (OB444)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the PARTS
LIST (RoHS compliant).
Revision D:
• MSZ-GA•NA and MSY-GA•NA have been added.
Please void OB450 REVISED EDITION-C.
Models
MSZ-A09NA, - 1
MSZ-A12NA, - 1
MSZ-A15NA, - 1
MSZ-A17NA, - 1
MSZ-A24NA, - 1
MSY-A15NA, - 1
MSY-A17NA, - 1
MSY-A24NA, - 1
MSZ-GA24NA
MSY-GA24NA

2
Revision A:
• PARTS LIST has been revised. (10-1.8, 10-2.8)
Revision B:
• MSZ-A•NA-1and MSY-A•NA-1
Remote controller has been changed.
Revision C:
• SPECIFICATION has been corrected.
Powerful has been added. (Airflow , Sound level)
Revision D:
• MSZ-GA•NA and MSY-GA•NA have been added.

3
1. Remote controller has been changed.
• Temperature indication function (°F/°C) has been added. (Refer to 11-10.)
• Timer indication has been changed. (AM/PM indication)
2. Conduit plate has been removed. (MSZ-A09/12/15/17, MSY-A15/17)
3. Conduit cover, terminal block cover and terminal block holder have been changed. (MSZ-A09/12/15/17, MSY-A15/17)
MSZ09UN →MSZ-A09NA
MSZ12UN →MSZ-A12NA
MSH15TN →MSZ-A15NA
MSH17TN →MSZ-A17NA
1. Control method between indoor and outdoor has been changed.
2. Indoor fan motor has been changed.
3. Signal of remote controller has been changed. (It is not available for conventional models.)
MSZ-A09NA →MSZ-A09NA-1
MSZ-A12NA →MSZ-A12NA-1
MSZ-A15NA →MSZ-A15NA-1
MSZ-A17NA →MSZ-A17NA-1
MSH24WN →MSZ-A24NA
MS15TN →MSY-A15NA
MS17TN →MSY-A17NA
MS24WN →MSY-A24NA
MSZ-A24NA →MSZ-A24NA-1
MSY-A15NA →MSY-A15NA-1
MSY-A17NA →MSY-A17NA-1
MSY-A24NA →MSY-A24NA-1
Models Remote controller Temperature indication
MSZ-A09/12/15/17NA KM06A °F
MSZ-A09/12/15/17NA- 1KM07J °F/°C
MSZ-A24NA KM06B °F
MSZ-A24NA - 1KM07K °F/°C
MSY-A15/17NA KM06C °F
MSY-A15/17NA - 1KM07L °F/°C
MSY-A24NA KM06D °F
MSY-A24NA - 1KM07M °F/°C
TECHNICAL CHANGES
1
MSZ-A24NA-1→MSZ-GA24NA
MSY-A24NA-1→MSY-GA24NA
1. Indoor electronic control P.C. board has been changed.

4
Line flow fan
Air outlet
Vertical vane
Air inlet
Display section
Front panel
Panel Heat exchanger
Horizontal vane
Operation section
(When the front panel is opened)
Remote controller
Remote control
receiving section
Catechin air filter
Air cleaning filter
(Anti-Allergy Enzyme
Filter, Blue bellows
type)
Emergency operation switch
Emergency operation switch
Operation indicator lamp
Remote control
receiving section
Operation Indicator
lamp
PART NAMES AND FUNCTIONS
2
MSZ-A09NA MSY-A15NA
MSZ-A12NA MSY-A17NA
MSZ-A15NA
MSZ-A17NA
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
MSZ-A09NA
MSZ-A12NA
MSZ-A15NA
MSZ-A17NA
MSY-A15NA
MSY-A17NA
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
ACCESSORIES
MSZ-A09/12/15/17NA
MSY-A15/17NA
MSZ-A09/12/15/17NA- 1
MSY-A15/17NA- 1
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
Installation plate 1 1 1
Installation plate fixing screw 4 × 25 mm 8 5 7
Remote controller holder 1 1 1
Fixing screw for 3.5 × 1.6 mm (Black) 2 2 2
Battery (AAA) for remote controller 2 2 2
Wireless remote controller 1 1 1
Felt tape (Used for left or left-rear piping) 1 1 1
Conduit plate 1 – –

5
3SPECIFICATION
Indoor unit model MSZ-A09NA MSZ-A12NA
External finish White
Power supply V, phase, Hz 208/230, 1, 60
Max.-fuse size (time delay) / Disconnect switch A 15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airflow
Low–Med.–High–Powerful
COOL Dry (Wet) CFM
152-229-307-338
(134-205-275-303) 152-240-353-388 (134-215-318-349)
HEAT 159-222-307-321 159-240-353-353
Moisture removal pt./h 2.3 3.2
Sound level
Low–Med.–High–Powerful
COOL dB(A) 22-33-38-41 22-34-42-44
HEAT 22-33-38-39 22-34-42-42
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
30-11/16
D8-1/4
H11-3/4
Weight Ib. 23
Remote controller Wireless type
Control voltage (by built-in transformer) 12-24 VDC
Indoor unit model MSZ-A15NA MSY-A15NA MSZ-A17NA MSY-A17NA
External finish White
Power supply V, phase, Hz 208/230, 1, 60
Max.-fuse size (time delay) / Disconnect switch A 15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airflow
Low–Med.–High–Powerful
COOL Dry (Wet) CFM 268-328-381-419 (240-293-342-376)
HEAT 254-314-381-381 — 254-314-381-381 —
Moisture removal pt./h 4.7 5.2
Sound level
Low–Med.–High–Powerful
COOL dB(A) 34-40-45-47 34-40-46-48
HEAT 34-38-44-44 — 34-38-44-44 —
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
30-11/16
D8-1/4
H11-3/4
Weight Ib. 23
Remote controller Wireless type
Control voltage (by built-in transformer) 12-24 VDC
Indoor unit model MSZ-A24NA MSZ-GA24NA MSY-A24NA MSY-GA24NA
External finish White
Power supply V, phase, Hz 208/230, 1, 60
Max.-fuse size (time delay) / Disconnect switch A 15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airflow
Low–Med.–High–Powerful
COOL Dry (Wet) CFM 296-431-568-624 (265-385-508-558)
HEAT 296-486-568-590 350-486-568-590 —
Moisture removal pt./h 7.3
Sound level
Low–Med.–High–Powerful
COOL dB(A) 34-40-49-51
HEAT 34-40-48-49 —
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
43-5/16
D10-1/4
H12-13/16
Weight Ib. 37
Remote controller Wireless type
Control voltage (by built-in transformer) 12-24 VDC
NOTE: Test conditions are based on ARI 210/240.
Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB) Rated frequency
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB Rated frequency
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB Maximum frequency

6
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
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
Model Mode Function Air flow (CFM) Air speed
(ft./sec.)
Coverage
range (ft.)
MSZ-A09NA
HEAT Dry 307 16.8 23.4
COOL Dry 307 16.8 23.4
Wet 275 15.1 21.0
MSZ-A12NA
HEAT Dry 353 19.3 26.7
COOL Dry 353 19.3 26.7
Wet 318 17.4 24.1
MSZ-A15NA HEAT Dry 381 20.9 28.8
MSZ-A15NA
MSY-A15NA COOL Dry 381 20.9 28.8
Wet 342 18.8 26.0
MSZ-A17NA HEAT Dry 381 20.9 28.8
MSZ-A17NA
MSY-A17NA COOL Dry 381 20.9 28.8
Wet 342 18.8 26.0
MSZ-A24NA
MSZ-GA24NA HEAT Dry 568 20.2 34.4
MSZ-A24NA
MSY-A24NA
MSZ-GA24NA
MSY-GA24NA
COOL
Dry 568 20.2 34.4
Wet 508 18.1 30.9
●The air coverage range is the fig-
ure 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 range should be
used only as a general guideline
since it varies according to the
size of the room and furniture ar-
ranged 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 14
5 (MUZ-GA24)
13
4 (MUZ-GA24)
Except - Umodel

7
4OUTLINES AND DIMENSIONS
Unit: inch
11-3/4
424-9/16
30-11/16
8-1/4 3/16
2-1/8
3/4
6-1/4
2-5/16
Air in
Air out
Installation plate
Insulation ø1-1/8
Drain hose ø5/8
(Connected part O.D)
Liquid line ø1/4 19-11/16
Gas line ø3/8 16-15/16
Insulation ø1-3/8 O.D
ø3/4 I.D
{
6-1/8 6-1/8
7/8
1-3/4
13-3/16 12-5/8
1-5/8 8-7/16
10-1/8
1-11/16
8-7/16
1/8 11-5/16
2-3/4
2-3/16
2-3/16 2-3/16
8-7/8 8-7/8
9/1610-3/4
9-3/16
Wall hole ø2-9/16
Indoor unit
Installation plate
7/16x13/16 Oblong hole
7/16x1 Oblong hole
7/8
hole
Conduit plate(MSZ-A•NA- and MSY-A•NA- are excluded.)
MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA
10-1/4
6-1/4
3/4
2-5/16
1-7/8
5/16
12-3/8
10-1/161-7/8
1/8
3-7/8
6-13/16
3-7/8 6-13/16 16-5/16 16-5/16
3/16
9-15/16
31-1/8
2-3/16
42-1/16
43-5/16
12-13/16
Air out
Air in
Insulation ø1-1/8
Drain hose ø5/8
(Connected part O.D)
Installation plate
Wall hole ø3
Wireless remote controller
Installation plate Indoor unit
{
Liquid line ø1/4 19-11/16
Gas line ø5/8 16-15/16
Insulation ø1-15/16 O.D
ø1-1/4 I.D
MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA

8
5WIRING DIAGRAM
MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA

9
REFRIGERANT SYSTEM DIAGRAM
6
MSZ-A09NA
MSZ-A12NA
Refrigerant flow in cooling
Refrigerant flow in heating
MSZ-A15NA MSY-A15NA
MSZ-A17NA MSY-A17NA
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
Unit: inch
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe ø1/2
(with heat insulator)
Flared connection
Flared connection
Indoor coil
thermistor
RT12(main)
Refrigerant pipe ø1/4
(with heat insulator)
Distributor
Indoor coil
thermistor
RT13(sub)
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe ø5/8
(with heat insulator)
Flared connection
Flared connection
Indoor coil
thermistor
RT12(main)
Refrigerant pipe ø1/4
(with heat insulator)
Distributor
Indoor coil
thermistor
RT13(sub)
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT13(sub)
Indoor coil
thermistor
RT12(main)
Refrigerant pipe ø3/8
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe ø1/4
(with heat insulator)

10
7SERVICE FUNCTIONS
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 8-7.)
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:
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.
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)
button twice or 3 times at
first.
After finish modification,
put back the batteries then
press the RESET button.
J2
J1
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA
MSY-A17NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
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