Mitsubishi Electric MS09NW User manual

SERVICE MANUAL
SPLIT-TYPE AIR CONDITIONERS
CONTENTS
1. FEATURES ························································2
2.TECHNICAL CHANGES ····································4
3. PART NAMES AND FUNCTIONS······················5
4. SPECIFICATIONS ··············································7
5. DATA ································································12
6. OUTLINES AND DIMENSIONS ······················23
7. WIRING DIAGRAM ··········································26
8. REFRIGERANT SYSTEM DIAGRAM ··············32
9. MICROPROCESSOR CONTROL ····················35
10. SERVICE FUNCTIONS ····································43
11. TROUBLESHOOTING ······································44
12. DISASSEMBLY INSTRUCTIONS ····················59
13. PARTS LIST······················································70
14. OPTIONAL PARTS ··········································79
Wireless type
Models
MS09NW (W) ·MU09NW MUM30NN
MS12NN (W) ·MU12NN MUM30NN2
MS15NN (W) ·MU15NN
MS17NN (W) ·MU17NN
MS09NW2 (W) ·MU09NW2
MS12NN2 (W) ·MU12NN2
MS15NN2 (W) ·MU15NN2
MS17NN2 (W) ·MU17NN2
No. OB192
The Slim Line.
From Mitsubishi Electric.
L
I
S
T
E
D
R
MS12NN MS12NN2
MS15NN MS15NN2
MS17NN MS17NN2
INDOOR UNIT
MU12NN MU12NN2
MU15NN MU15NN2
MU17NN MU17NN2
OUTDOOR UNIT
Remote
controller
Refer to our Service Manual OB202 when the
indoor unit is used in the multi-system operation.
Applied models are MS09NW and MS15NN.
REVISED EDITION -B
Revision:
●MS09NW2, MS12NN2, MS15NN2 and
MS17NN2 has been added.
●Parts List has been partially modified.
●Please void OB192 REVISED EDITION -A.

2
1FEATURES
Models Cooling capacity SEER
MS09NW MS09NW2 8,500Btu/h 10.2
MS12NN MS12NN2 12,300/12,600Btu/h 11.3/11.3
MS15NN MS15NN2 14,300/14,600Btu/h 10.5/10.5
MS17NN MS17NN2 15,900/16,100Btu/h 10.2/10.2
MS12NN MS15NN MS17NN
MS12NN2 MS15NN2 MS17NN2 MU12NN MU15NN MU17NN MU12NN2 MU15NN2 MU17NN2
LCD wireless
remote controller
NEW “I FEEL CONTROL” IN OUR LCD WIRELESS REMOTE CONTROLLER WITH ON/OFF PROGRAM
TIMER
Mitsubishi Electric’s new wireless remote controller incorporates a number of advanced features that provide even greater con-
trol and ease-to- use. It has a liquid crystal display which indicates such information as mode, fan speed and temperature
selected as well as the programmed ON/OFF time. It is also equipped with “I Feel Control”, a unique Mitsubishi Electric feature
that allows the user to adjust the temperature to exactly the level he or she wants simply by tapping the button that describes
present conditions : “Too Cool” or “Too Warm”.The optimum temperature set this way is then memorized for immediate recall
whenever the air conditioner is used again. And what’s more, the new controller has been redesigned and easier to handle
than before.
Select desired air flow direction.
REMOTE-CONTROL OPERATION MODE
Using the remote controller, you can select from five airflow set-
tings to match room layout and the location of people. Also, you
can set the vane to swing automatically.
SWING
Revision:
●The following parts numbers have been modified.
1. OUTDOOR P.C. BOARD of MUM30NN (T2W 800 451 ➔T2W E46 451)
2. SURGE KILLER of MUM30NN (T2W E64 410 has been added)
3. CAPILLARY TUBE (for 09A, 09B) of MUM30NN (M21 463 936 ➔M21 195 936) (See REFRIGERANT SYSTEM)
4. CAPILLARY TUBE (for 15C) of MUM30NN (M21 987 936 ➔M21 G46 936) (See REFRIGERANT SYSTEM)
5. CAPILLARY TUBE (for 09A, 09B) of MUM30NN2 (M21 463 936 ➔M21 AP9 936) (See REFRIGERANT SYSTEM)
6. CAPILLARY TUBE (for 15C) of MUM30NN2 (M21 987 936 ➔M21 G46 936) (See REFRIGERANT SYSTEM)
7. HIGH PRESSURE SWITCH of MUM30NN2 (Q’ty/unit 1 ➔3)
8. MC1. MC2. CAPACITOR of MUM30NN2 (T2W 738 353 ➔T2W 903 353)
●Please void OB192REVISED EDITION -B.

3
Small in size, big on cooling.
COMPACT INDOOR UNIT
The sleek design of the NW/NN Series matches virtually any room
layout. For instance, MS09 is 1013/16 o321/16 o73/16 (HoWoD),
which used to be 143/16 o311/8o53/8.
AUTO-RESTART FUNCTION
The auto restart function restarts the equipment when power is
restored following an outage automatically. Operation resumes in
the mode in which the equipment was running immediately before
the outage.
HIGH PERFORMANCE ROTARY COMPRESSOR
The advanced design of Mitsubishi Electric’s powerful and energy
efficient rotary compressor results in lower operating costs and
longer service life.
1013/16
MS09NW MS09NW2
SPACE-SAVING LAYOUT
Two or three indoor units are served by a single outdoor unit whose installation requires only minimum space. This allows
equipment installed outside the house to be arranged in a neat, space-saving layout.
FLEXIBLE INSTALLATION OF INDOOR UNITS
Each indoor unit can be connected to piping up to 65 feet in length, providing plenty of freedom in determining the best loca-
tions for installation.
MUM30NN
MUM30NN2
LCD Wireless
remote controller
MS09NW (A) MS15NN (C)
MS09NW (B)
Cooling Capacity (BTU/h)
1 Indoor Unit Operation
2 Indoor Unit Operation
3 Indoor Unit Operation
8,200
—
—
8,200
8,200
—
8,100
MS09NW
—
8,200
—
8,200
—
8,200
8,100
MS09NW
—
—
12,400
—
12,400
12,400
12,200
Operation Indoor unit MS15NN
This “3 to 1” Multi system (MSM30NN / MSM30NN2) consists of a single outdoor unit with three compressors that per-
mit up to three indoor units to be installed separate rooms, each with its own controller.
MSM30NN MSM30NN2

4
2
MS09EW
➔
MS09NW
1. Indoor unit has been changed.
(Outline dimension changes. 31-1/8”o5-3/8” o14-3/16”(WoDoH)➔32-1/16” o7-3/16”o10-13/16(WoDoH)
2. Outdoor unit has been changed.
(Outline dimension changes. 29-15/16”o9-1/16” o21-1/4”(WoDoH)➔30-11/16” o10-1/16”o21-1/4”(WoDoH))
(Capillary tube, refrigerant and pipe had changed.)
3. Remote controller has been changed. (The timer function was changed to the clock timer function.)
4. Indoor auto vane has been adopted.
MS12EN, MS15EN
➔
MS12NN, MS15NN
1. Indoor unit has been changed.
(Outline dimension changes. 39-3/8”o7” o14-3/16”(WoDoH)➔39-15/16” o7-1/2”o12-5/8”(WoDoH))
2. Outdoor unit has been changed.
(Outline dimension changes. 33-1/2”o11-7/16” o23-7/8”(WoDoH)➔33-7/16” o11-7/16”o23-13/16”(WoDoH))
(Capillary tube, refrigerant and pipe had changed.)
3. Remote controller has been changed. (The timer function was changed to the clock timer function.)
4.The swing mode has been added to indoor auto vane.
MSM30EN2
➔
MSM30NN
1. Indoor unit has been changed.
2. Outdoor unit has been changed.
3. Remote controller has been changed. (The timer function was changed to the clock timer function.)
4.The swing mode has been added to indoor auto vane.
5. Outdoor unit fan speed control has been changed.(MF1/MF2 : 1.Lo/Lo➔Stop/Hi 2.Me/Me➔Me/Me 3.Hi/Hi➔Hi/Hi)
6.The relay “X64” has been added to electric circuit.
7. Surge absorber has been added to electric circuit.
MSM30NN
➔
MSM30NN2
1. Outdoor unit has changed.
2. Compressor has changed. (Compressor A,B: KH122WEV➔KH122WES)
3. Outdoor unit fan speed control has changed.(MF1/MF2 : 1.Stop/Hi➔Lo/Lo 2.Me/Me➔Lo/Lo 3.Hi/Hi➔Hi/Hi)
4.Wiring diagram has been changed.
5. Capillary tube has been changed.
6. Accumulator has been enlarged.(Refrigerant cycle A and B)
7. High-pressure switch has been added.
8. Outdoor unit heat exchanger has changed.
MS09NW
➔
MS09NW2
MS12NN MS15NN MS17NN
➔
MS12NN2 MS15NN2 MS17NN2
1. Power supplied way has changed from “supply to both indoor and outdoor” to “supply to only outdoor”. (“Supply to both
indoor and outdoor” as before is also possible.)
2. Remote controller has changed.
(•The timer function has changed from program timer to ON/OFF timer.
NW/NN system can be used ON and OFF timer in combination.
In NW2/NN2 systems, either ON or OFF is available at a time.
•SWING button is removed, but SWING MODE function is available by VANE CONTROL button.)
3.The number of conduit holes on the outdoor unit has changed from 2 to 3.
TECHNICAL CHANGES

5
PART NAMES AND FUNCTIONS
3
INDOOR UNIT
MS09NW MS09NW2
Operation section
MS12NN
Emergency operation switch
Emergency operation switch
(When the front panel is opened)
MS09NW MS09NW2 MS09NW MS09NW2
MS12NN MS12NN2
MS15NN MS15NN2
MS17NN MS17NN2
Air inlet
(back and side)
Piping
Drainage hose
Air outlet
Drain outlet
Air inlet
(back and side)
Piping
Drainage hose
Air outlet
Drain outlet
OUTDOOR UNIT MU12NN MU12NN2
MU15NN MU15NN2
MU17NN MU17NN2
MU09NW MU09NW2
MS12NN MS12NN2
MS15NN MS15NN2
MS17NN MS17NN2
MS12NN MS12NN2
MS15NN MS15NN2
MS17NN MS17NN2

6
MS09NW MS12NN MS15NN MS17NN
REMOTE CONTROLLER
Signal transmitting
section
Operation display
section
OPERATE/STOP
(ON/OFF)button
OPERATION
SELECT button
FAN SPEED
CONTROL button
ON-TIMER button
CLOCK SET button
HR. button
MIN. button
(TIME SET button)
TEMPERATURE
button
VANE CONTROL
button
SWING button
OFF-TIMER button
RESET button
Signal transmitting
section
Operation display
section
OPERATE/STOP
(ON/OFF)button
OPERATION
SELECT button
FAN SPEED
CONTROL button
TEMPERATURE
button
VANE CONTROL
button
TIME SET button
RESET button
TIMER MODE
SELECT button
ON/OFF
TIMER CONTROL
FAN
VANE
RESET
SELECT TIME
TOO
WARM
TOO
COOL
Hr
MODE
I FEEL COOL DRY FAN
OUTDOOR UNIT
MUM30NN MUM30NN2
MS09NW2 MS12NN2 MS15NN2 MS17NN2
REMOTE CONTROLLER

7
4
Notes w1 :Test conditions are based on ARI 210/240
Rating conditions (cooling) — Indoor : 80-FDB, 67-FWB, Outdoor : 95-FDB, 75-FWB
Operating Range
ITEM MODELS
Cooling capacity
Power consumption
EER [SEER]
INDOOR UNIT MODEL
External finish
Power supply
Max. fuse size (time delay)
Min. ampacity
Fan motor
Airflow Lo—Me—Hi
Moisture removal
Sound level Lo-Me-Hi
Cond. drain connection O.D.
Dimensions
Weight
OUTDOOR UNIT MODEL
External finish
Power supply
Max. fuse size (time delay)
Min. ampacity
Fan motor
Compressor
Refrigerant control
Sound level
Dimensions
Weight
REMOTE CONTROLLER
Control voltage (by built-in transformer)
REFRIGERANT PIPING
Pipe size
Connection method
Between the indoor
& outdoor units
Refrigerant filling capacity (R-22)
Refrigerant oil (Model)
w1
w1
w1
Dry
Wet
W
D
H
Model
Winding resistance (at 68˚F) "
W
D
H
Liquid
Gas
Indoor
Outdoor
Height difference
Piping length
Btu/h
W
V, phase, Hz
A
A
F.L.A
CFM
CFM
Pints/h
dB(A)
in.
in.
in.
in.
lbs
V, phase, Hz
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
lbs
in.
in.
ft
ft
lbs
cc
8,500
840
10.1 (10.2)
0.5
0.37
208-265-328
177-226-279
2.3
31-37-42
32-1/16
7-3/16
10-13/16
18
115, 1, 60
14
0.66
KH122WES
C-R 0.98 C-S 2.21
10
37
46
30-11/16
10-1/16
21-1/4
64
3/8
2 lbs 2 oz
270 (MS56)
White
115, 1, 60
15
5/8
Munsell 5Y6.5/1
15
Capillary tube
Wireless type
12V DC
Not supplied (optional parts)
1/4
Flared
Flared
Max. 25
Max. 49
12,300/12,600
1,100/1,130
11.2/11.2 (11.3/11.3)
0.6
0.43
360-395-452
314-342-392
3.2
36-39-42
39-15/16
7-1/2
12-5/8
31
208/230, 1, 60
12
0.52
RH167NHDT
C-R 2.16 C-S 3.11
9
29
52
33-7/16
11/7/16
23-13/16
92
5/8
2 lbs 14 oz
520 (MS56)
MS09NW
MS09NW
MU09NW
MS09NW2
MS09NW2
MU09NW2
MS12NN
MS12NN
MU12NN
MS12NN2
MS12NN2
MU12NN2
Cooling Maximum
Minimum
Indoor intake air temperature
95-FDB, 71-FWB
67-FDB, 57-FWB
Outdoor intake air temperature
115-FDB
67-FDB
SPECIFICATIONS
When MS09NW indoor unit is operating with MUM18NW, MUM30NN and MUM30NN2 outdoor unit connected.
(Please refer to the manual No.OB202 for MUM18NW.)

Item Model
Cooling capacity
Power consumption
EER [SEER]
INDOOR UNIT MODEL
External finish
Power supply
Max. fuse size (time delay)
Min. ampacity
Fan motor
Airflow Lo—Me—Hi
Moisture removal
Sound level Lo-Me-Hi
Cond. drain connection O.D.
Dimensions
Weight
OUTDOOR UNIT
External finish
Power supply
Max. fuse size (time delay)
Min. ampacity
Fan motor
Compressor
Refrigerant control
Sound level
Dimensions
Weight
REMOTE CONTROLLER
Control voltage (by built-in transformer)
REFRIGERANT PIPING
Pipe size
Connection method
Between the indoor
& outdoor units
Refrigerant filling capacity (R-22)
Refrigerant oil (Model)
w1
w1
w1
Dry
Wet
W
D
H
Model
Winding resistance (at 68˚F) "
W
D
H
Liquid
Gas
Indoor
Outdoor
Height difference
Piping length
Btu/h
W
V, phase, Hz
A
A
F.L.A
CFM
CFM
Pints/h
dB(A)
in.
in.
in.
in.
lbs
V, phase, Hz
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
lbs
in.
in.
ft
ft
lbs
cc
14,300/14,600
1,370/1,400
10.4/10.4 (10.5/10.5)
0.6
0.43
360-395-452
293-321-367
4.7
36-39-42
14
RH207NHDT
C-R 1.68 C-S 2.78
10
35
52
92
2 lbs 14 oz
520 (MS56)
White
115, 1, 60
15
5/8
39-15/16
7-1/2
12-5/8
31
Munsell 5Y6.5/1
208/230, 1, 60
20
0.52
Capillary tube
33-7/16
11-7/16
23-13/16
Wireless type
12V DC
Not supplied (optional parts)
1/4
5/8
Flared
Flared
Max. 25
Max. 49
15,900/16,100
1,570/1,600
10.1/10.1 (10.2/10.2)
0.7
0.51
406-441-491
346-374-417
5.1
40-43-45
15
RH231NHDT
C-R 1.65 C-S 2.67
11
38
52
97
3 lbs
520 (MS56)
MS15NN
MS15NN
MU15NN
MS15NN2
MS15NN2
MU15NN2
MS17NN
MS17NN
MU17NN
MS17NN2
MS17NN2
MU17NN2
8
Notes w1 :Test conditions are based on ARI 210/240
Rating conditions (cooling) — Indoor : 80-FDB, 67-FWB, Outdoor : 95-FDB, 75-FWB
Operating Range
Cooling Maximum
Minimum
Indoor intake air temperature
95-FDB, 71-FWB
67-FDB, 57-FWB
Outdoor intake air temperature
115-FDB
67-FDB
When MS15NN indoor unit is operating with MUM30NN and MUM30NN2 outdoor unit connected.
(Please refer to the manual No.OB202 for MUM18NW.)

9
Model
Cooling capacity w1 BTU/h
w1 WPower consumption
EER (Triple unit operation)
SEER (Triple unit operation)
INDOOR UNIT MODEL
Extenal finish
Power Supply V, Hz, Phase
A
F.L.A
CFM
CFM
(Pints/h)
in.
in.
in.
in.
lbs.
V, Hz, Phase
A
F.L.A
Winding resistance (at 68˚F) "
Model
W
D
H
W
D
H
Dry
Wet
Liquid
Gas
Indoors
Outdoors
Height difference
Piping length
R.L.A
L.R.A
in.
in.
in.
in.
in.
ft
ft
lbs.
Max. fuse size (time delay)
Min. ampacity
Fan motor
Airflow
Lo-Me-Hi
Moisture removal
Cond. drain connection OD
Dimensions
Weight
OUTDOOR UNIT MODEL
External fnish
Power supply
Max. fuse sizu (time delay)
Min. ampacity
Fan motor
Compressor
Refrigerant control
Dimensions
Weight
REMOTE CONTROLLER
Control voltage (be built-in transformer)
REFRIGERANT PIPING
Pipe size
Connection
method
Between the
indoor &
outdoor units
Items MSM30NN
Triple-Unit
A+B+C
28,400
2,990
DoubIe-Unit
A+B A+C or B+C
16,400 20,600
1,860 9.5
10.0
2,060
MS15NNMS09NW
115,60,1
15.0 0.6
0.43
360-395-452
314-342-392
3.2
5/8
39-15/16
7-1/2
12-5/8
31
MUM30NN
Munsell 5Y 7/1
208/230,60,1(3-wire)
30
25
0.8+0.7
KH122WEV<115V> RH167NAB<208/230V>
C-R 0.97 C-S 4.81 C-R 2.47 C-S 4.62
10 8
37 29
Capillary tube
37-7-16
15-3/8
45-5/16
240
Wireless type
DC12V
Not supplied (optional parts)
1/4 1/4
3/8 5/8
Flared Flared
Flared Flared
Max. 25 Max. 25
Max. 65
3 lbs 3 oz
270 (MS56)
Max. 65
3 lbs 8 oz
520 (MS56)
Notes w1.Test conditions are based on ARI 210/240
Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, 75˚FWB
Operating Range
Cooling Maximum
Maximum
Indoor air intake temperature
90˚FDB,71˚FWB
67˚FDB,57˚FWB
Outdoor air intake temperature
115˚FDB
67˚FDB
Single-Unit
A or B C
990
8,200 12,400
1,220
0.5
0.37
208-265-328
177-226-279
2.1
5/8
32-1/16
7-3/16
18
10-13/16
A B C
MS09NW
White
0.5
0.37
208-265-328
177-226-279
2.1
5/8
32-1/16
7-3/16
18
10-13/16
Sound level dB (A) 4242 42
Sound level dB (A) Max. 57
Refrigerant filling capacity (R-22)
Refrigerant oil (Model) lbs.
cc

10
Model
Cooling capacity w1BTU/h
w1WPower consumption
EER (Triple unit operation)
SEER (Triple unit operation)
INDOOR UNIT MODEL
Extenal finish
Power Supply V, Hz, Phase
A
F.L.A
CFM
CFM
(Pints/h)
in.
in.
in.
in.
lbs.
V, Hz, Phase
A
F.L.A
Winding resistance (at 68˚F) "
Model
W
D
H
W
D
H
Dry
Wet
Liquid
Gas
Indoors
Outdoors
Height difference
Piping length
R.L.A
L.R.A
in.
in.
in.
in.
in.
ft
ft
lbs.
Max. fuse size (time delay)
Min. ampacity
Fan motor
Airflow
Lo-Me-Hi
Moisture removal
Cond. drain connection OD
Dimensions
Weight
OUTDOOR UNIT MODEL
External fnish
Power supply
Max. fuse sizu (time delay)
Min. ampacity
Fan motor
Compressor
Refrigerant control
Dimensions
Weight
REMOTE CONTROLLER
Control voltage (be built-in transformer)
REFRIGERANT PIPING
Pipe size
Connection
method
Between the
indoor &
outdoor units
Items MSM30NN2
Triple-Unit
A+B+C
28,400
2,870
DoubIe-Unit
A+B A+C or B+C
16,400 20,600
1,830 9.9
10.0
2,060
MS15NN
White
MS09NW
115,60,1
15.0 0.6
0.43
360-395-452
314-342-392
3.2
5/8
39-15/16
7-1/2
12-5/8
31
MUM30NN2
Munsell 5Y 7/1
208/230,60,1(3-wire)
30
25
0.8+0.7
KH122WES<115V> RH167NAB<208/230V>
C-R 0.98 C-S 2.21 C-R 2.47 C-S 4.62
10 8
37 29
Capillary tube
37-7/16
15-3/8
45-5/16
244
Wireless type
DC12V
Not supplied (optional parts)
1/4 1/4
3/8 5/8
Flared Flared
Flared Flared
Max. 25 Max. 25
Max. 65
2 lbs 14 oz
270 (MS56)
Max. 65
3 lbs 1 oz
520 (MS56)
Notes w1.Test conditions are based on ARI 210/240
Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, 75˚FWB
Operating Range
Cooling Maximum
Maximum
Indoor air intake temperature
90˚FDB,71˚FWB
67˚FDB,57˚FWB
Outdoor air intake temperature
115˚FDB
67˚FDB
Single-Unit
A or B C
990
8,200 12,400
1,260
0.5
0.37
208-265-328
177-226-279
2.1
5/8
32-1/16
7-3/16
18
10-13/16
A B C
MS09NW
0.5
0.37
208-265-328
177-226-279
2.1
5/8
32-1/16
7-3/16
18
10-13/16
Sound level dB (A) 4242 42
Sound level dB (A) Max. 57
Refrigerant filling capacity (R-22)
Refrigerant oil (Model) lbs.
cc