Mitsubishi Electric MSZ09UN, MSZ12UN, MUZ12UN, MUZ09UN Service Manual

L

I

S

T

E

D

CUS

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Revision A:

●Conditions of operation frequency have been added.

Please void OB297.

SERVICE MANUAL

Wireless type
Models

MSZ09UN (W) · MUZ09UN
MSZ12UN (W) · MUZ12UN

No. OB297

REVISED EDITION-A

MSZ09UN

INDOOR UNIT

MUZ09UN
MUZ12UN

OUTDOOR UNIT

Remote
controller

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

The Slim Line.
From Mitsubishi Electric.

TM

MSZ09UN

MUZ09UN
MUZ12UN

LCD wireless
remote controller

MSZ12UN

Hours

Room T emperature

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

Revision A:

• Conditions of operation frequency have been added.

• SPECIFICATION, DATA, WIRING DIAGRAM and PARTS LIST have been partially modified.

1

FEATURES

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.

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 tech­nology promotes maximum compressor efficiency by flexibly changing
the rotation speed of it to accurately match operating requirements.

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(

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

The sound level of indoor unit has been lowered.

Sound level

Fan speed

High / Low

Model

MSH09EW

43 / 32

MSZ09UN

36 / 22

MSH12EN

48 / 38

2

MSZ12UN

42 / 35

(dBA)

44/55

)

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.

MUH12EN

Sound level (Cooling/Heating)

MUZ12UN

49 / 49

54 / 54

dB(A)

“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 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 that memorized for immedi­ate 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.

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 rota­tion – 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.

The sound level of outdoor unit has been lowered.

3

2

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

Air inlet (back and side)

Piping

Drainage hose
Service panel

Air outlet

Drain outlet

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSZ09UN

(When the grille is opened)

MSZ09UN

MSZ09UN

MSZ12UN

MSZ12UN

OUTDOOR UNIT

MUZ09UN
MUZ12UN

MSZ12UN

4

Installation plate
Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.)
Remote controller mounting hardware
Fixing screw for 3 3.5 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

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

REMOTE CONTROLLER

MSZ09UN
MSZ12UN

5

3

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

SPECIFICATION

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
❈2 : (heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB Maximum frequency: Hz

(heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB Rated frequency: Hz

6

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.

Outside

diameter

Minimum

Wall

thickness

Outside

diameter

Minimum

Wall

thickness

MSZ09UN
MSZ12UN

MUZ09UN
MUZ12UN

Additional piping

Max. length : ft.

A

49

Gas

Piping size : in. Length of connecting pipe : in.

Liquid

Indoor unit

Outdoor unit

Model

Gas :

Liquid :00

Gas :

Liquid :

16-15/16
19-11/16

[ 3/8
[ 1/2

[ 1/4

0.0285

0.0265

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

MAX. REFRIGERANT PIPING LENGTH

MAX. HEIGHT DIFFERENCE

7

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 (x10

3

Btu/h), SHC : Sensible Heat Capacity (x10

3

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

Model

Refrigerant piping length (one way : ft.)

1.0

25 (std.)

0.954

40

0.927

49

MSZ09UN
MSZ12UN

MUZ09UN
MUZ12UN

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 (x10

3

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

DATA

MSZ09UN
MSZ12UN

MUZ09UN
MUZ12UN

4-1. PERFORMANCE DATA

1) COOLING CAPACITY

2) COOLING CAPACITY CORRECTIONS

3) HEATING 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 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.

8

4-2. PERFORMANCE CURVE

71
67
63

71
67
63

65
70
75

75
70
65

Total power consumption (kW) Total capacity (

✕10

3

Btu/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 ( ✕10

3

Btu/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

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.

MSZ09UN MUZ09UN
(Cooling)

MSZ09UN MUZ09UN
(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.

9

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)

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.

MSZ12UN MUZ12UN
(Cooling)

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.

10

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.

MSZ09UN
(Cooling)

MSZ09UN
(Heating)

Data is based on the condition of indoor humidity 50%.
Air flow should be set to High speed.

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.

11

MSZ12UN

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)

(Cooling)

Data is based on the condition of indoor humidity 50%.
Air flow should be set to High speed.

MSZ12UN
(Heating)

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.

12

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

✻ Control voltage

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.

13

4-5. OPERATING RANGE

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

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

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

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

(1) POWER SUPPLY

(2) OPERATION

4-6. OUTLET AIR SPEED AND COVERAGE RANGE

4-7. ADDITIONAL REFRIGERANT CHARGE R22(oz.)

14

● The air coverage range 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 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.

MSZ09UN
MUZ09UN

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 refer­ence at service.

MSZ12UN
MUZ12UN

Cooling

}

Heating

}

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

15

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

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

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

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

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).

MUZ09UN

MUZ12UN

MUZ09UN

MUZ12UN

16

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

Correction 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

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

0.6
14

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).

MUZ09UN

Correction of Heating capacity

1.5

1.0

0.5

Capacity correction factors

0.0
0 50 100 150(Hz)

The operational frequency of compressor

MUZ12UN

MUZ09UN

Correction of total input

1.5

1.0

0.5

Input correction factors

0.0

0 50 100 150(Hz)

The operational frequency of compressor

MUZ12UN

17

5

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 O 13/16

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

OUTLINES AND DIMENSIONS

MSZ09UN

INDOOR UNIT

10-15/16

2-5/16

32-3/16

33-1/2

3/4

6-3/8

Wireless remote controller

3-1/4

Installation plate

Indoor unit

3-1/4

6-1/224-3/42-1/4

1-5/8

Air in

12-13/16 12-13/16

3/16

1/4 or more

3-15/16

Air out

7-7/16

Installation plate

2-5/8
3-1/16

6-5/8

9-1/8

1/8

1-5/8

4-5/8

Wall hole [2-9/16

Liquid line [1/4 19-11/16
Gas line [3/8 16-15/16

{

Insulation [1-7/16 O.D

[13/16 I.D

Drain hose [5/8
(Connected part O.D)
Insulation [1-1/8

Unit: inch

3/16

10-11/16

MSZ12UN

INDOOR UNIT

18

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

OUTDOOR UNIT

14-7/16

Air in

10-7/16

1-9/32

3-5/8

Air in

Drainage holes [1-3/32

1-5/16

4 holes 3/8o13/16

11/16

Handle

19-1/2

Air out

5

Drainage holes [1-3/32

Drainage holes [1-3/32

Drainage holes [1-3/32

1-3/8

1-9/16

10-1/32

1-9/32

11-7/32

25/32

Unit: inch

12-5/8

Service panel

Liquid refrigerant pipe joint
Refrigerant pipe (flared) [1/4

21-1/4

10-5/8

3/8

4-1/8

10-7/16

19-11/16

Bolt pitch for installation

28

6-3/32

3-17/32

2-11/16

5-7/16

Service port

19

43-

35-

Gas refrigerant pipe joint
Refrigerant pipe (flared)

[3/8 (MUZ09UN
[1/2 (MUZ12UN

)
)

6

HIC1

( )

FROM OUTDOOR

1 phase
60Hz

CONNECTING
WIRE

TO OUTDOOR
UNIT

12V DC

SUPPLY

POWER

WIRES

CONNECTING

UNIT

115V

w A disconnect may be required by local code.

5

TAB12

P.C.BOARD

DISPLAY

MV

RED

GRN/YLW

DSAR

3

L1

RED

BLK

N

3
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

102CN151CN104CN101

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 THERMIST OR

INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK

WIRING DIAGRAM

MSZ09UN

MODEL WIRING DIAGRAM

INDOOR UNIT

TB

L1

3+
1-

N

ORN

VLT

BLK

RED

SYMBOL

MV

NR11

RT11

RT12

CN201

1
2
3
4

TAB12

LD101T

CN

151

MV

ELECTRONIC CONTROL P.C. BOARD

5

5

POWER MONITOR,
RECEIVER
P.C.BOARD

NAME NAME
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR
MAIN INDOOR COIL THERMISTOR

TO OUTDOOR
UNIT
CONNECTING
WIRES
12V DC

FROM OUTDOOR
UNIT
CONNECTING
WIRES

POWER

(

)

SUPPLY
115V
1 phase
60Hz

TO OUTDOOR
UNIT
CONNECTING
WIRE

w

w A disconnect may be required by local code.

SYMBOL

C11
F11

HIC1

NOTE:1. About the outdoor side electric wiring, refer to the outdoor unit electric wiring diagram for servicing.

INDOOR FAN CAPACITOR
FUSE(3A)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER FUSE)

MF

2. Use copper conductors only.(For field wiring)

3. Symbols below indicate;
: Terminal block, : Connector

NAME

HIC1

NR11

TRANS

F11

REMOTE
CONTROLLER

SR141

SYMBOL

RT13

SR141

TB

C11

4
3
2

1

CN112

CN

121

1
2
3

CN211

CN

111

3

RT13
RT12

BLK
GRY
YLW
BRN

WHT

RED

RT11

1
2
3

MF

4
5
6

SUB INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK

MSZ12UN

INDOOR UNIT

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

20

MUZ09UN
MUZ12UN

OUTDOOR UNIT

MODELS WIRING DIAGRAM

DSA61

NR61

NOISE FILTER
P.C. BOARD

FROM INDOOR UNIT
CONNECTING WIRES
12V DC

TO INDOOR UNIT
CONNECTING
115V
1 phase 60Hz

POWER
SUPPLY
208/230V
1 phase 60Hz

INDOOR UNIT

FROM

GROUND

L62

3
1
N

L1

L1

N

L2

LDE2

TAB66

TB2

TB1

CY61

CY62

ORN
VLT
BLK
RED

RED
BLK

BLU

L63

TAB65

GRN

WHT

12

CN725

TAB69

X64

TAB68

RELAY
P.C. BOARD

CN771

CY63

CT61

CY64

LDE1

GRN

LD64

SSR61

CN721

21S4 MF61

R.V. coil
heating ON
cooling OFF

RED

BLU

3

WHT

R64

4

ORN

LD62

F901

C65

53

642

RED

BLK

X61

1

WHT

DS61

(~)
(–) (~)

4

TAB
67

(+)

YLW

BLU

3

CN723

BLK

DS62

RED

(~)

BLK

C63

123

ORN

(–)

YLW

LEV

6

CN724

RT61 RT62

(+)
(~)

TAB

CN641

RED

N

RED

TAB
P

R61

P

U

V

W

4321

T801

TABU
TABV

TABW

N

IPM

BLK

123

WHT

MC

W

BLK

F801

WHT

V

RED
RED

U

L61

BLK

C61

+

–

YLW

CN726

CN722

CN601

VLT

+

–

RT64

21

CN642

ELECTRONIC
CONTROL
P.C. BOARD

SYMBOL
CT61
C61
C63
C65
CY61~64
DSA61
DS61,62
F801
F901
IPM

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

CURRENT TRANSFORMER
POWER-FACTOR CAPACITOR
SMOOTHING CAPACITOR
OUTDOOR FAN CAPACITOR
CAPACITOR
SURGE ABSORBER
DIODE STACK
FUSE (2A)
FUSE (1A)
INTELLIGENT POWER MODULE

2.Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

NAME

SYMBOL
LEV
L61
L62,L63
MC
MF61
NR61
RT61
RT62
RT64
R61

NAME
EXPANSION VALVE COIL
REACTOR
COMMON MODE CHOKE COIL
COMPRESSOR
OUTDOOR FAN MOTOR(INNER PROTECTOR)
VARISTOR
DEFROST THERMISTOR
DISCHARGE TEMPERATURE THERMIST OR
FIN TEMPERATURE THERMIST OR
CURRENT-DETECTING RESISTOR

SYMBOL
R64
SSR61
TB1,2
T801
X61
X64
21S4

NAME
CURRENT-LIMITING RESISTOR
SOLID STATE RELAY
TERMINAL BLOCK
TRANSFORMER
FAN MOTOR RELAY
RELAY
R.V. COIL

21

7

Room
Temperature
thermistor
RT11

Sub
indoor coil
thermistor
RT13

Main
indoor coil
thermistor
RT12

Refrigerant pipe {3/8
(with heat insulator)

Flared connection

Stop valve
(with service port)

Stop valve
(with strainer)

Fusible
plug

Service
port

Service
port

Muffler

Muffler

4-way valve

Compressor

Capillary
tube

Expansion
valve

Capillary tube
O.D.0.12OI.D.0.079O7-7/8

Flow of refrigerant (cooling)
Flow of refrigerant (heating)

Capillary
tube

R.V. coil
heating ON
cooling OFF

O.D.0.12OI.D.0.079O11-13/16 O.D.0.12OI.D.0.079O11-13/16

Discharge
temperature
thermistor
RT62

Flared connection

Refrigerant pipe {1/4
(with heat insulator)

Indoor
heat
exchanger

Outdoor
heat
exchanger

Defrost
thermistor
RT61

Strainer

REFRIGERANT SYSTEM DIAGRAM

MSZ09UN

Unit:inch

MUZ09UN

INDOOR UNIT

OUTDOOR UNIT

Unit:inch

MSZ12UN

MUZ12UN

INDOOR UNIT OUTDOOR UNIT

4-way valve

Discharge
temperature
thermistor
RT62

Service
port

Capillary tube
O.D.0.12OI.D.0.079O7-7/8

O.D.0.12OI.D.0.079O11-13/16 O.D.0.12OI.D.0.079O11-13/16

Service
port

Muffler

Compressor

Defrost
thermistor
RT61

Capillary
tube

Expansion
valve

Strainer

Flow of refrigerant (cooling)
Flow of refrigerant (heating)

Outdoor
heat
exchanger

Capillary
tube

R.V. coil
heating ON
cooling OFF

Indoor
heat
exchanger

Room
Temperature
thermistor
RT11

Main
indoor coil
thermistor
RT12

Refrigerant pipe {1/2
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe {1/4
(with heat insulator)

Stop valve
(with service port)

Stop valve
(with strainer)

Muffler

Fusible
plug

22

8

lighted
not lighted

Approx. 4 ˚F or more

Difference between target
temperature and room
temperature

Approx. 4 ˚F or less

This shows that the air conditioner is operating to reach
the target temperature.
Please wait until the target temperature is obtained.

This shows that the room temperature is
approaching the target temperature.

Operation stateIndication

Operation Indicator

Operation Indicator lamp

The operation indicator located at the right side of the indoor unit indicates the operation state.

• The following indication applies regardless of shape of the indicatior.

INDOOR UNIT DISPLAY SECTION

ON/OFF

FAN

TOO

WARM

TOO
COOL

VANE

MODE

STOP

START

HR.

MIN.

I FEEL

COOL

HEAT

DRY

RESET CLOCK

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

ON/OFF

TOO

COOL

PM

AM

TOO

WARM

Signal transmitting section

Operation display section

OPERATE /STOP
(ON /OFF)button

TEMPERATURE buttons

MICROPROCESSOR CONTROL

MSZ09UN
MSZ12UN

MUZ09UN
MUZ12UN

Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP(ON/OFF)
button ON.
Indoor unit receives the signal with a beep tone.
When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for
3 minutes.

WIRELESS REMOTE CONTROLLER

23

8-1. “I FEEL CONTROL” OPERATION

(1) Press OPERATE/STOP(ON/OFF) button on the remote controller.

OPERATION INDICATOR lamp of the indoor unit turns on with a
beep tone.

(2) Press OPERATION SELECT button to set “I FEEL CONTROL”.

Then a beep tone is heard.

(3) The operation mode is determined by the room temperature at

start-up of the operation.

● Once the mode is fixed, the mode does not change by room temperature afterwards.

● Under the ON-TIMER ( START) operation, mode is determined according to the room temperature as the operation

starts.

● When the system is stopped with the OPERATE/STOP(ON/OFF) button on the remote controller, and restarted within 2
hours in “I FEEL CONTROL” mode, the system operates in previous mode automatically regardless of the room tem­perature.

Operation time chart
Example

Initial room temperature

77˚F or more

73˚F to 77˚F

less than 73˚F

“I FEEL CONTROL”
“I FEEL CONTROL”

“I FEEL CONTROL”

mode

COOL mode of

DRY mode of

HEAT mode of

Previous operation

COOL mode of
“I FEEL CONTROL”
or COOL mode

When the system is restarted after 2 hours and more, the operation mode is determined by the room temperature at
start-up of the operation.

Operation time chart
Example

Previous operation

COOL mode of
“I FEEL CONTROL” or
COOL mode

(4) The initial set temperature is decided by the initial room temperature.

Restart

COOL mode of
“I FEEL CONTROL”

Restart

COOL or DRY or HEAT

mode of “I FEEL CON­TROL” that determined
by room temperature at
start-up of the operation.

Mode Initial room temperature Initial set temperature

COOL mode of

“I FEEL CONTROL”

DRY mode of

“I FEEL CONTROL”

HEAT mode of

“I FEEL CONTROL”

❈1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-

less of the room temperature at restart.
The set temperature is calculated by the previous set temperature.

79˚F or more

77˚F to 79˚F

73˚F to 77˚F

less than 73˚F

24

75˚F

Initial room temperature
minus 4˚F
Initial room temperature
minus 4˚F

79˚F

❈ 1