Mitsubishi Electric Mr.Slim MSZ09UN W User manual

SERVICE MANUAL
CONTENTS
1. FEATURES·························································2
2. PART NAMES AND FUNCTIONS······················4
3. SPECIFICATION·················································6
4. DATA···································································8
5. OUTLINES AND DIMENSIONS ·······················18
6. WIRING DIAGRAM ··········································20
7. REFRIGERANT SYSTEM DIAGRAM··············22
8. MICROPROCESSOR CONTROL ····················23
9. SERVICE FUNCTIONS ····································39
10. TROUBLESHOOTING······································41
11. DISASSEMBLY INSTRUCTIONS·····················61
12. PARTS LIST······················································68
13. OPTIONAL PARTS···········································74
Wireless type
Models
MSZ09UN (W) · MUZ09UN
MSZ12UN (W) · MUZ12UN
No. OB297
REVISED EDITION-A
The Slim Line.
From Mitsubishi Electric.
L
I
S
T
E
D
CUS
Remote
controller
TM
SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS
MSZ09UN
INDOOR UNIT
MUZ09UN
MUZ12UN
OUTDOOR UNIT
Revision A:
●Conditions of operation frequency have been added.
Please void OB297.
OB297--1.qxp 04.2.4 4:19 PM Page 1

2
1FEATURES
MSZ09UN
MUZ09UN
MUZ12UN
LCD wireless
remote controller
MSZ12UN
High–speed cooling & heating
Ideal and comforting performance is assured by controlling compressor
rotation according to the cooling and heat load of a room. Inverter tech-
nology promotes maximum compressor efficiency by flexibly changing
the rotation speed of it to accurately match operating requirements.
Optimum comfort year-round
To ensure that a room is never too cold or too hot, inverter technology
allows the system to detect subtle fluctuations in room temperature and
adjust automatically. Unlike conventional air conditioning units that must start
or stop the compressor repetitively, inverter units offer finely tuned operation
– such as the accurate control of room temperature – for a more comforting
airflow and far less temperature variations.
Hours
Room Temperature
Single speed comppressor Model
Temperature is adjusted by
turning on/ off the compressor.
Inverter Model
Constant temperature is maintained
by compressor speed control.
10
13
Cool
MSH12EN MSZ12UN
6.8
7.7
Heat
MSH12EN MSZ12UN
Extra energy – savings
Inverter technology makes the value of SEER and HSPF better compared to non-inverter model’s value.
Model Cooling capacity Heating capacity SEER HSPF(44/55)
MSZ09UN 8,800 Btu/h 12,300 Btu/h 12.0 7.7/6.7
MSZ12UN 11,400 Btu/h 16,000 Btu/h 13.0 7.7/6.7
High / Low
MSH09EW MSH12EN
Model
Fan speed
Sound level
MSZ09UN MSZ12UN
43 / 32 36 / 22 42 / 35
48 / 38
(dBA)
The sound level of indoor unit has been lowered.
Revision A:
• Conditions of operation frequency have been added.
• SPECIFICATION, DATA, WIRING DIAGRAM and PARTS LIST have been partially modified.
OB297--1.qxp 04.2.4 4:19 PM Page 2

3
“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 provides even greater
control 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 timer. It is also equipped with “I Feel Control”, a unique Mitsubishi Electric fea-
ture 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 that memorized for immedi-
ate recall whenever the air conditioner is used again.
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.
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.
SWING
Single rotary:
Centrifugal force always
produced in one direction,
resulting in excessive vibration.
Twin rotary:
Centrifugal force of one
roller counterbalanced
by that of the other roller
for significantly lower vibration.
MSH09EW MSH12EN
Model
Size
MSZ09UN MSZ12UN
14-13/16 10-15/16 12-5/8
14-3/16
(in.)
The height of indoor unit has been shortened.
Outdoor unit: Twin rotary compressor greatly reduces noise
Unlike conventional models equipped with a single rotary, the features a twin-rotary compressor that provides balanced rota-
tion – the centrifugal force of one roller is counterbalanced by the other – for significantly reduced vibration and noise. It’s
exactly this kind of technology that makes Mitsubishi Electric’s outdoor units so quiet.
MUH12EN
Sound level (Cooling/Heating)
MUZ12UN
49 / 49
54 / 54
dB(A)
The sound level of outdoor unit has been lowered.
OB297--1.qxp 04.2.4 4:19 PM Page 3

4
PART NAMES AND FUNCTIONS
2
INDOOR UNIT
MSZ09UN
Operation section
Emergency operation switch
Horizontal vane
Air filter
Deodorizing filter(option)
(gray sponge type)
Vertical vanes
Air inlet
Grille
Remote control
receiving section
Remote controller
Air cleaning filter(option)
(white bellows type)
Front panel
Emergency operation switch Operation indicator lamp
Receiving section
Operation indicator lamp
Receiving section
(When the grille is opened)
MSZ09UN MSZ09UN
Air inlet (back and side)
Piping
Drainage hose
Service panel
Air outlet
Drain outlet
OUTDOOR UNIT
MUZ09UN
MUZ12UN
MSZ12UN MSZ12UN
MSZ12UN
OB297--1.qxp 04.2.4 4:19 PM Page 4

5
Installation plate
Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.)
Remote controller mounting hardware
Fixing screw for 33.5 x 16 mm(0.14 x 0.63 in.) (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
1
5
1
2
2
1
1
1
2
3
4
5
6
7
MSZ09UN
1
6
1
2
2
1
1
MSZ12UN
ACCESSORIES
REMOTE CONTROLLER
MSZ09UN
MSZ12UN
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
HEAT
DRY
PM
CLOCK
AM
RESET CLOCK
Open the front lid.
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
TEMPERATURE buttons
OPERATION SELECT button
FAN SPEED CONTROL button
OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
VANE CONTROL button
CLOCK SET button
OB297--1.qxp 04.2.4 4:19 PM Page 5

6
SPECIFICATION
3
NOTE : Test conditions are based on ARI 210/240.
❈1 : Rating conditions(cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB) Rated frequency: Hz
(heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB Rated frequency: Hz
❈2 : (heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB Maximum frequency: Hz
Item Model MSZ12UN
Capacity
Rated(Minimum~Maximum)
Capacity Rated
Power consumption
Rated(Minimum~Maximum)
Power consumption Rated
EER [SEER]
HSPF IV(V)
COP
INDOOR UNIT MODEL
External finish
Power supply
Max. fuse size (time delay)/ Disconnect switch
Min. circuit ampacity
Fan motor
Auxiliary heater
Airflow Low—Med.—High
Moisture removal
Sound level Low-Med.-High
Cond. drain connection O.D.
Dimensions
Weight
OUTDOOR UNIT MODEL
External finish
Power supply
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
Compressor
Refrigerant control
Sound level
Defrost method
Dimensions
Weight
REMOTE CONTROLLER
Control voltage (by built-in transformer)
REFRIGERANT PIPING
Refrigerant pipe size
(Min. wall thickness)
Connection method
Between the indoor
& outdoor units
Refrigerant charge (R22)
Refrigerating oil (Model)
Btu/h
Btu/h
Btu/h
W
W
W
V, phase, Hz
A
A
F.L.A
A(kW)
CFM
CFM
pt./h
dB(A)
in.
in.
in.
in.
Ib.
V, phase, Hz
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
Ib.
in.
in.
ft.
ft.
oz.
7.7 (6.7)
White
115, 1, 60
15
–
5/8
7-1/2
Munsell 5.6Y 8.0/0.5
208/230, 1, 60
15
14
0.43
SHV-130FEA
U-V 1.05 U-W 1.05 U-W 1.05
9.7
41
Liner expansion valve
49
Reverse cycle
28
10-1/16
21-1/4
75
Wireless type
12V DC
Not supplied (optional parts)
1/4 (0.0265)
Flared
Flared
Max. 25
Max. 49
10.8 (MS56)
11,400(2,900~13,000)
16,000(2,400~19,500)
11,600
1,140(290~1,460)
1,590(280~2,050)
1,760
10.0[13.0]
2.95
MSZ12UN
0.6
0.43
360-395-452
360(311)-395(339)-452(388)
2.8
35-39-42
39-15/16
12-5/8
31
MUZ12UN
1/2 (0.0285)
2 Ib. 14 oz.
8,800(2,600~9,700)
12,300(2,300~15,700)
10,000
980(290~1,250)
1,320(280~1,770)
1,420
9.0 [12.0]
2.73
MSZ09UN
0.5
0.37
184-237-297
148(124)-215(180)-279(233)
2.3
22-29-36
33-1/2
10-15/16
20
3/8 (0.0285)
2 Ib. 7 oz.
❈1❈3
❈1
❈1
❈2
❈1❈1
❈2
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Heating
Heating
MSZ09UN
MUZ09UN
HEAT Dry
COOL Dry(Wet)
W
D
H
Model
Winding resistance (at 68˚F) Ω
W
D
H
Liquid
Gas
Indoor
Outdoor
Height difference
Piping length
❈1
❈4
OB297--1.qxp 04.2.4 4:19 PM Page 6

7
Indoor
unit
w Max. Height
difference 25ft. Outdoor unit
Refrigerant Piping
Max.length
A
w Height difference should be within
25ft. regardless of which unit,
indoor or outdoor position is high.
MAX. HEIGHT DIFFERENCE
Outside
diameter Minimum
Wall
thickness Outside
diameter Minimum
Wall
thickness
MSZ09UN
MSZ12UN
MUZ09UN
MUZ12UN
Additional piping
Max. length : ft.
A
49
GasPiping size : in. Length of connecting pipe : in. Liquid Indoor unit Outdoor unit
Model
Gas :
Liquid :
0
0
Gas :
Liquid :
16-15/16
19-11/16
[ 3/8
[ 1/2 [ 1/4
0.0285 0.0265
MAX. REFRIGERANT PIPING LENGTH
Test condition
SEER
(Cooling)
HSPF
(Heating)
ARI
Mode
"A" Cooling Steady State
at rated compressor Speed
"B-2" Cooling Steady State
at rated compressor Speed
"B-1" Cooling Steady State
at minimum compressor Speed
Low ambient Cooling Steady State
at minimum compressor Speed
Intermediate Cooling Steady State
At Intermediate compressor Speed❈5
Standard Rating-Heating
at rated compressor Speed
Low temperature Heating
at rated compressor Speed
Max temperature Heating
at minimum compressor Speed
High temperature Heating
at minimum compressor Speed
Frost Accumulation
at rated compressor Speed
Test Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
Frost Accumulation
at Intermediate compressor Speed❈5
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
❈5 : At Intermediate compressor Speed
=("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
(Unit : [˚F])
❈3, ❈4
OB297--1.qxp 04.2.4 4:19 PM Page 7

8
DATA
4
Model
Indoor air Outdoor intake air DB temperature(˚F)
71
67
63
71
67
63
10.8
10.2
9.6
14.0
13.2
12.4
6.1
7.1
8.0
8.3
9.7
10.7
0.87
0.82
0.78
1.01
0.96
0.91
10.1
9.5
8.9
13.1
12.3
11.5
5.7
6.7
7.4
7.8
9.0
9.9
0.96
0.91
0.87
1.11
1.05
1.01
9.5
8.8
8.3
12.3
11.4
10.7
5.4
6.2
6.9
7.3
8.3
9.3
1.03
0.98
0.94
1.20
1.14
1.09
8.8
8.2
7.5
11.4
10.6
9.7
5.0
5.7
6.3
6.8
7.7
8.4
1.08
1.04
1.00
1.26
1.21
1.16
8.1
7.5
6.9
10.5
9.7
8.9
4.6
5.3
5.7
6.3
7.1
7.7
1.13
1.09
1.04
1.31
1.27
1.21
IWB
(˚F)75 85 95 105 115
MSZ09UN
MSZ12UN
NOTE 1. IWB : Intake air wet-bulb temperature
TC : Total Capacity (x103 Btu/h), SHC : Sensible Heat Capacity (x103 Btu/h)
TPC : Total Power Consumption (kW)
2. SHC is based on 80˚F of indoor intake air DB temperature.
TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC
4-1. PERFORMANCE DATA
1) COOLING CAPACITY
MSZ09UN
MSZ12UN MUZ09UN
MUZ12UN
Model Refrigerant piping length (one way : ft.)
1.0
25 (std.)
0.954
40
0.927
49
MSZ09UN
MSZ12UN MUZ09UN
MUZ12UN
2) COOLING CAPACITY CORRECTIONS
3) HEATING CAPACITY
Model
Indoor air Outdoor intake air WB temperature(˚F)
75
70
65
75
70
65
7.1
7.6
7.7
9.3
9.8
10.1
0.98
0.95
0.91
1.18
1.14
1.10
8.9
9.2
9.7
11.6
12.0
12.6
1.16
1.13
1.09
1.39
1.36
1.31
10.6
10.9
11.3
13.8
14.2
14.6
1.29
1.25
1.22
1.55
1.51
1.47
12.0
12.3
12.7
15.6
16.0
16.5
1.35
1.32
1.29
1.63
1.59
1.55
12.4
12.7
13.0
16.1
16.5
17.0
1.37
1.35
1.31
1.65
1.62
1.57
14.0
14.3
14.6
18.2
18.6
19.0
1.43
1.40
1.37
1.72
1.69
1.65
IDB
(˚F)15 25 35 43 45 55
MSZ09UN
MSZ12UN
NOTE: 1. IDB : Intake air dry-bulb temperature
TC : Total Capacity (x103 Btu/h)
TPC : Total Power Consumption (kW)
2. Above data is for heating operation without any frost.
TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode
or EMERGENCY HEAT mode before starting to operate the air conditioner.
2. The compressor starts up.
The operational frequency of the compressor is MSZ09UN: 64Hz, MSZ12UN: 70Hz in EMERGENCY COOL mode and
58Hz in EMERGENCY HEAT mode.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on the
remote controller.
OB297--1.qxp 04.2.4 4:19 PM Page 8

9
4-2. PERFORMANCE CURVE
71
67
63
71
67
63
65
70
75
75
70
65
Total power consumption (kW) Total capacity ( ✕103Btu/h)
Outdoor intake air DB temperature (°F)
SHF at rating condition = 0.70
= 233CFM
= 0.23
Airflow
Bypass Factor
12
10
8
6
1.2
65 75 85 95 105 115
0.8
0.6
Total power consumption (kW) Total capacity ( ✕103Btu/h)
Outdoor intake air WB temperature (°F)
= 297CFM
Airflow
13
15
11
9
7
1.6
1.4
15 25 35 45 55
1.0
0.6
0.8
1.2
1.0
Indoor intake air WB temperature (°F)
Indoor intake air DB temperature (°F)
Indoor intake air DB temperature (°F)
Indoor intake air WB temperature (°F)
0.4
MSZ09UN MUZ09UN
(Heating)
MSZ09UN MUZ09UN
(Cooling)
This value of frequency is not the same as the actual frequency in operating. Refer to the page 16, 17 for the relationships
between frequency and capacity.
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode
or EMERGENCY HEAT mode before starting to operate the air conditioner.
2. The compressor starts up.
The operational frequency of the compressor is 64Hz in EMERGENCY COOL mode and 58Hz in EMERGENCY HEAT
mode.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on the
remote controller.
OB297--1.qxp 04.2.4 4:19 PM Page 9

10
MSZ12UN MUZ12UN
(Cooling)
71
67
63
71
67
63
14
12
8
10
1.5
1.3
1.1
0.9
0.7
0.5
Indoor intake air WB temperature (°F)
Indoor intake air WB temperature (°F)
65
70
75
75
70
65
21
17
9
13
2.0
1.0
SHF at rating condition = 0.73
= 388CFM
= 0.19
Airflow
Bypass Factor
65 75 85 95 105 115
Total power consumption (kW) Total capacity ( ✕10 Btu/h)
Outdoor intake air DB temperature (°F)
Indoor intake air DB temperature (°F)
= 452CFM
Airflow
15 25 35 45 55
Total power consumption (kW) Total capacity ( ✕10 Btu/h)
Outdoor intake air WB temperature (°F)
1.2
1.4
1.6
1.8
Indoor intake air DB temperature (°F)
MSZ12UN MUZ12UN
(Heating)
This value of frequency is not the same as the actual frequency in operating. Refer to the page 16, 17 for the relationships
between frequency and capacity.
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode
or EMERGENCY HEAT mode before starting to operate the air conditioner.
2. The compressor starts up.
The operational frequency of the compressor is 70Hz in EMERGENCY COOL mode and 58Hz in EMERGENCY HEAT
mode.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on the
remote controller.
OB297--1.qxp 04.2.4 4:19 PM Page 10

11
Data is based on the condition of indoor humidity 50%.
Air flow should be set to High speed.
MSZ09UN
(Cooling)
Data is based on the condition of outdoor humidity 75%.
Air flow should be set to High speed.
Data is for heating operation without any frost.
MSZ09UN
(Heating)
68 70 75 80 85 90 95 100 104 (°F)
40
45
50
55
60
65
70
75
80
85
90
95
100
(PSIG)
Condensing pressure
86
80
75
70
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
(PSIG)
86
80
75
70
68 70 75 80 85 90 95 100 104
(°F)
140
160
180
200
220
240
260
280
300
Indoor DB temperature (°F)
Outdoor ambient temperature
75
70
65
(PSIG)
Condensing pressure
Outdoor ambient temperature
5 10152025303540455055606570(°F)
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
Indoor DB temperature(°F)
75
70
65
(PSIG)
Suction pressure
Outdoor ambient temperature
5 10152025303540455055606570(°F)
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Indoor DB temperature (°F)
4-3. Condensing pressure
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode
or EMERGENCY HEAT mode before starting to operate the air conditioner.
2. The compressor starts up.
The operational frequency of the compressor is MSZ09UN: 64Hz, MSZ12UN: 70Hz in EMERGENCY COOL mode and
58Hz in EMERGENCY HEAT mode.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on the
remote controller.
OB297--1.qxp 04.2.4 4:19 PM Page 11

12
Data is based on the condition of indoor humidity 50%.
Air flow should be set to High speed.
MSZ12UN
(Cooling)
Data is based on the condition of outdoor humidity 75%.
Air flow should be set to High speed.
Data is for heating operation without any frost.
MSZ12UN
(Heating)
68 70 75 80 85 90 95 100 104(°F)
50
55
60
65
70
75
80
85
90
95
100
105
110
(PSIG)
Condensing pressure
86
80
75
70
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
(PSIG)
86
80
75
70
68 70 75 80 85 90 95 100 104(°F)
140
160
180
200
220
240
260
280
300
Indoor DB temperature (°F)
Outdoor ambient temperature
75
70
65
(PSIG)
Condensing pressure
Outdoor ambient temperature
5 10152025303540455055606570(°F)
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
Indoor DB temperature(°F)
(PSIG)
Outdoor ambient temperature
75
70
65
Suction pressure
5 10152025303540455055606570(°F)
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Indoor DB temperature (°F)
OB297--1.qxp 04.2.4 4:19 PM Page 12

13
POWER SUPPLY
✻ Control voltage
4-4. STANDARD OPERATION DATA
MSZ09UN
INDOOR UNIT
115V
1phase 60Hz,
2 wires
OUTDOOR UNIT
208/230V
1phase 60Hz,
2 wires
SIGNAL WIRE
2 wires 12V DC
208/230V
1phase 60Hz,
3 wires
115V
INDOOR UNIT
OUTDOOR UNIT
SIGNAL WIRE
2 wires 12V DC
115V
1phase 60Hz,
2 wires
Disconnect
switch
Cooling
8,800
0.70
980
64
0.945
5.34/5.11
237
74
184
112
52
154
80
67
57
56
950
233(Wet)
95
–
Capacity
SHF
Input
Rated frequency
Indoor unit
Power supply (V, phase, Hz)
Input
Fan motor current
Aux. heater current
Outdoor unit
Power supply (V, phase, Hz)
Input
Comp. current
Fan motor current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp
Ref. pipe length
Refrigerant charge (R22)
Intake air temperature
Discharge air temperature
Fan speed (High)
Airflow (High)
Intake air temperature
Fan speed
Airflow
Unit
Btu / h
—
kW
Hz
kW
A
A
kW
A
A
PSIG
PSIG
˚F
˚F
˚F
˚F
ft.
—
˚F
˚F
˚F
˚F
rpm
CFM
˚F
˚F
rpm
CFM
Cooling
11,400
0.73
1,140
70
1.093
5.84/5.71
256
87
186
54
160
80
67
58
56
388(Wet)
95
–
Heating
16,000
–
1,590
99
1.543
8.24/7.71
265
57
197
34
171
70
60
114
–
452(Dry)
47
43
Heating
12,300
–
1,320
76
1.285
6.84/6.81
276
59
198
122
36
172
70
60
100
–
1,000
297(Dry)
47
43
DB
WB
DB
WB
DB
WB
Item
Model
Total
Electrical
circuit
Refrigerant
circuit
Indoor
unit
Outdoor
unit
MSZ09UN
MSZ09UN
115, 1, 60
0.035
0.34
–
MUZ09UN
208/230, 1, 60
0.36/0.39
25
2 Ib. 7 oz.
650/720
847/953
MSZ12UN
MSZ12UN
115, 1, 60
0.047
0.41
–
MUZ12UN
208/230, 1, 60
0.36/0.39
118
25
2 Ib. 14 oz.
1,200
650/720
847/953
MSZ12UN
INDOOR UNIT
OUTDOOR UNIT
115V
1phase 60Hz,
2wires
208/230V
1phase 60Hz,
2 wires
SIGNAL WIRE
2 wires 12V DC
INDOOR UNIT
OUTDOOR UNIT
208/230V
1phase 60Hz,
3 wires
115V
1phase 60Hz,
2 wires
SIGNAL WIRE
2 wires 12V DC
115V
Disconnect
switch
Power supply voltage to serial signal circuit is 12V DC.
Voltage between 11- and 33+ on in-out terminal block will be 12V DC peak voltage.
OB297--1.qxp 04.2.4 4:20 PM Page 13

14
4-5. OPERATING RANGE
(1) POWER SUPPLY
MSZ09UN
MSZ12UN
MUZ09UN
MUZ12UN
Indoor unit
Outdoor unit
Rated voltage
115V 1phase 60Hz
208/230V 1phase 60Hz
Guaranteed Voltage
Model
Min. 103V Max. 127V 115V
Min. 198V Max. 253V
208V 230V
4-6. OUTLET AIR SPEED AND COVERAGE RANGE
Model
MSZ09UN
MSZ12UN
Mode
HEAT
COOL
HEAT
COOL
297
279
233
452
452
388
15.8
14.9
12.4
18.2
18.2
15.6
22.3
21.0
17.6
29.2
29.2
25.2
Air flow
(CFM) Air speed (ft./sec.) Coverage range (ft.)
Function
Dry
Dry
Wet
Dry
Dry
Wet
4-7. ADDITIONAL REFRIGERANT CHARGE R22(oz.)
MSZ09UN
MSZ12UN
MUZ09UN
MUZ12UN
Outdoor unit
precharged
(up to 25ft.)
2 lb. 7 oz.
2 lb. 14 oz.
25ft.
0
30ft.
1.62
35ft.
3.24
Refrigerant piping length (one way)
40ft.
4.86
45ft.
6.48
49ft.
8.10
Model
(2) OPERATION
78% —
Function
Cooling
Heating
Standard temperature
Maximum temperature
Minimum temperature
Maximum humidity
Standard temperature
Maximum temperature
Minimum temperature
DB (˚F)
80
95
67
70
80
70
WB (˚F)
67
71
57
60
67
60
Indoor
DB (˚F)
95
115
67
47
75
17
WB (˚F)
—
—
—
43
65
15
Outdoor
Condition
Intake air
temperature
●The air coverage range is the figure up
to the position where the air speed is 1
ft./sec., when air is blown out horizon-
tally 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 arranged inside the room.
OB297--1.qxp 04.2.4 4:20 PM Page 14

15
The standard data contained in these specifications apply only to the operation of the system under normal conditions. Since
operating conditions vary according to the areas where these units are installed. The following information has been provided
to clarify the operating characteristics of the system under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
INDOOR UNIT 103 ~ 127V 60Hz
OUTDOOR UNIT 198 ~ 253V 60Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature :°F WB
(2) Indoor outlet air wet-bulb temperature :°F WB
(3) Outdoor intake air dry-bulb temperature :°F DB
(4) Total input :W
(5) Indoor intake air dry-bulb temperature :°F DB
(6) Outdoor intake air wet-bulb temperature :°F WB
(7) Total input :W
Indoor air wet/dry-bulb temperature difference on the left side of the chart on page 16 and 17 shows the difference
between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your refer-
ence at service.
How to measure the indoor air wet-bulb/ dry-bulb temperature difference
1. Attach at least 2 sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air
speed is high.
2. Attach at least 2 sets of wet-and dry-bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of room.
5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
INDOOR UNIT OUTDOOR UNIT
}
Cooling
}
Heating
MSZ09UN
MUZ09UN MSZ12UN MUZ12UN
OB297--1.qxp 04.2.4 4:20 PM Page 15

16
0 50 100 150(Hz)
0.0
0.5
1.0
1.5 Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
MUZ09UN
Correction of total input
Input correction factors
The operational frequency of compressor
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
MUZ09UN
0 50 100 150(Hz)
0.0
0.5
1.0
1.5 Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
MUZ12UN
Correction of total input
Input correction factors
The operational frequency of compressor
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
MUZ12UN
18.7
17.1
15.5
14.0
12.6
11.2
MSZ09UN MSZ12UN
13.9
12.8
11.7
10.6
9.5
8.5
80 85 90 95 100 105 110 80 85 90 95 100 105 110
79
75
72
68
64
79 75 72
68
64
Cooling capacity
✴These values are under rated (frequency).
OB297--1.qxp 04.2.4 4:20 PM Page 16

17
0 50 100 150(Hz)
0.0
0.5
1.0
1.5Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
Correction of total input
Input correction factors
The operational frequency of compressor
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
MUZ09UN MUZ09UN
0 50 100 150(Hz)
0.0
0.5
1.0
1.5Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
Correction of total input
Input correction factors
The operational frequency of compressor
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
MUZ12UN MUZ12UN
50.4
46.6
42.7
38.9
34.9
31.0
27.2
23.2
MSZ09UN MSZ12UN
43.2
39.8
36.5
33.1
30.0
26.5
23.2
20.0
14 20 30 40 50 60
59
68
79
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.614 20 30 40 50
59
68
79
60
Heating capacity
NOTE:The following curves are for the heating operation without any frost.
✴These values are under rated (frequency).
OB297--1.qxp 04.2.4 4:20 PM Page 17

18
OUTLINES AND DIMENSIONS
5
MSZ09UN
INDOOR UNIT
6-3/8
3/4
2-5/16
Wireless remote controller
4-5/8
3-1/4
2-5/8
3-1/16
32-3/16
33-1/2
6-1/224-3/42-1/4
1/4 or more
3-15/16
1-5/8
1/8
1-5/8
10-11/16 3/16
9-1/8
3-1/4 6-5/8
12-13/16 12-13/16
3/16
7-7/16
Air in
Air out Insulation [1-1/8
Drain hose [5/8
(Connected part O.D)
Installation plate
Wall hole [2-9/16
Indoor unit
Installation plate
Liquid line [1/4 19-11/16
Gas line [3/8 16-15/16
Insulation [1-7/16 O.D
[13/16 I.D
{
10-15/16
MSZ12UN
INDOOR UNIT
Unit: inch
6-3/8
3/4
2-5/16
1/8 11-11/16
17-11/16
17-11/16
13-7/817-1/4
10
10-13/16
13/16
2-3/8
1-9/16
5-7/8 25-1/2 8-9/16
3/167-1/2
39-3/16
7-1/230-1/21-15/16
12-5/8
39-15/16
Wireless remote controller
4holes 7/16 O13/16 Indoor unit
Installation plate Wall hole [2-15/16
Installation plate
Liquid line [5/16 19-11/16
Gas line [1/2 16-15/16
Insulation [1-15/16 O.D
[1-1/8 I.D
Insulation [1-1/8
Drain hose [5/8
Air out
{
Air in
OB297--1.qxp 04.2.4 4:20 PM Page 18

19
MUZ09UN MUZ12UN
Even if the right/left sides
or back side are vacant, the
top has to be at least 4 in.
unobstructed.
REQUIRED SPACE
Even if the right/left sides or back side
are vacant, the front has to be at least
4 in. unobstructed.
14 in. or more
4 in. or more
4 in. or more
Basically unobstructed
Basically
unobstructed
WA
WA
WB
WA

WB
In case of poorly-ventilated place, the front or the back
has to be at least 8 in. unobstructed.
The wall may get dirty in case the air is discharged
toward it.
T.B. cover
Lock nut
Conduit cover
Connector
Service panel
Remove one fixing
screw to open the
service panel
Remove the screw
holding the T.B.
cover, and then
remove the cover
Unit: inch
OUTDOOR UNIT
Liquid refrigerant pipe joint
Refrigerant pipe (flared) [1/4
Service panel
Gas refrigerant pipe joint
Refrigerant pipe (flared)
[3/8 (MUZ09UN)
Service port
Bolt pitch for installation
Handle
Air out
Air in Drainage holes [1-3/32
4 holes 3/8o13/16
11/16
19-11/16
28
10-7/16
4-1/8
2-11/16
5-7/16
25/32
1-9/16
Air in
10-7/16
Drainage holes [1-3/32
5
1-9/32
3-5/8
14-7/16
Drainage holes [1-3/32
1-5/16
1-9/32 10-1/32
11-7/32
12-5/8
6-3/32
3-17/32
43-
35-
21-1/4
10-5/8
3/8
[1/2 (MUZ12UN)
19-1/2
Drainage holes [1-3/32
1-3/8
OB297--1.qxp 04.2.4 4:20 PM Page 19

20
WIRING DIAGRAM
6
MSZ09UN MODEL WIRING DIAGRAM
INDOOR UNIT
TAB12
POWER
FROM OUTDOOR
UNIT
CONNECTING
WIRES
TO OUTDOOR
UNIT
CONNECTING
WIRE
SUPPLY
115V
1 phase
60Hz
CN201
RT12
RT13
121
CN
CN211
CN112
TO OUTDOOR
UNIT
CONNECTING
WIRES
12V DC
5
F11
VLT
1-
3+
5
3
REMOTE
CONTROLLER
MV
POWER MONITOR,
RECEIVER
P.C.BOARD
BLK
GRY
TRANS
HIC1
C11
N
L1
BLK
ORN
WHT
BRN
YLW
RED
ELECTRONIC CONTROL P.C. BOARD
NR11
RED
MF
CN
151 LD101T
SR141 1
2
3
4
3
2
11
2
3
4
5
6
RT11
CN
111
1
2
3
4
TB
w
()
wA disconnect may be required by local code.
NOTE:1. About the outdoor side electric wiring, refer to the outdoor unit electric wiring diagram for servicing.
2. Use copper conductors only.(For field wiring)
3. Symbols below indicate;
: Terminal block, : Connector
SYMBOL
RT13
SR141
TB
SYMBOL
MV
NR11
RT11
RT12
SYMBOL
C11
F11
HIC1
MF
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE(3A)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
MAIN INDOOR COIL THERMISTOR
SUB INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
MSZ12UN
HIC1
( )
FROM OUTDOOR
1 phase
60Hz
CONNECTING
WIRE
TO OUTDOOR
UNIT
12V DC
SUPPLY
POWER
WIRES
CONNECTING
UNIT
115V
wA disconnect may be required by local code.
5
TAB12
P.C.BOARD
DISPLAY
MV
RED
GRN/YLW
DSAR
3
L1 RED
BLK
N3
4
P.C.BOARD
AUTO RESTART
ASSY
CONTROLLER
REMOTE
RECEIVER
ELECTRONIC CONTROL P.C. BOARD
53
F11
TRANS
LDFVL
SR141
NR11
SR142
SR143
SR144
C11
LDFM
LDFL
LDFH
LDC12
LDC11
LDCOM
TO OUTDOOR
CONNECTING
WIRES
UNIT
CN
102 CN 151 CN 104 CN 101
CN
112
CN
111
TB CN201
ORN
VLT
1-
3+ 1
2
BRN
7
BRN
GRN/YLW
8
YLW
BLU
RED
ORN
WHT
BLK
3
BLU
YLW
BLK 5
6
4
ORN
RED
WHT 2
1
MF
RT11
RT12
w
SYMBOL
RT12
SR141~SR144
TB
SYMBOL
MF
MV
NR11
RT11
SYMBOL
C11
DSAR
F11
HIC1
NAME NAME NAME
INDOOR FAN CAPACITOR
SURGE ABSORVER
FUSE(3A)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
NOTE:1. About the outdoor side electric wiring, refer to the outdoor unit electric wiring diagram for servicing.
2. Use copper conductors only. (For field wiring)
3. Symbols below indicate;
/: Terminal block, : Connector
MODEL WIRING DIAGRAM
INDOOR UNIT
OB297--1.qxp 04.2.4 4:20 PM Page 20