Mitsubishi Electric Mr. Slim MUZ-GE18NA-1 Service manual

Revision G:

• The descriptions of the expansion valve coil have been corrected. (10-4.)

• Some descriptions have been modified.

Please void OBH549 REVISED EDITION-F.

OUTDOOR UNIT

SERVICE MANUAL

HFC

utilized

R410A

No. OBH549

REVISED EDITION-G

Models

MUZ-GE09NA

MUZ-GE09NA2

MUZ-GE12NA

MUZ-GE12NA2

MUZ-GE15NA,

MUZ-GE15NA2

-

1

-

1

MUZ-GE18NA,

MUZ-GE24NA

MUY-GE09NA

MUY-GE09NA2

MUY-GE12NA

MUY-GE12NA2

MUY-GE15NA,

MUY-GE15NA2

-

1

MUZ-GE09NAH

MUZ-GE09NAH2

MUZ-GE12NAH

MUZ-GE12NAH2

MUZ-GE15NAH

MUZ-GE15NAH2

MUZ-GE18NAH

MUY-GE18NA,

MUY-GE24NA

-

1

Indoor unit service manual

MSZ-GE•NA MSY-GE•NA Series (OBH548)

MUZ-GE09NA/NA2

MUZ-GE12NA/NA2

MUZ-GE15NA,

-

1

/NA2

MUY-GE09NA/NA2

MUY-GE12NA/NA2

MUY-GE15NA,

-

1

/NA2

MUZ-GE09NAH/NAH2



CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 4

3. SPECIFICATION ················································ 6

4. OUTLINES AND DIMENSIONS ······················ 10

5. WIRING DIAGRAM ·········································· 13

6. REFRIGERANT SYSTEM DIAGRAM ············· 25

7. DATA ································································ 28

8. ACTUATOR CONTROL ··································· 42

9. SERVICE FUNCTIONS ··································· 43

10. TROUBLESHOOTING ····································· 44

11. DISASSEMBLY INSTRUCTIONS ···················· 64

PARTS CATALOG (OBB549)

TM

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

Use the speci

fi

ed refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.

Correct refrigerant is specified in the manuals and on the spec labels provided with our products.

We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

Revision A:

•

MUZ-GE24NA and MUY-GE24NA have been added.

Revision B:

•

Descriptions regarding the outdoor fan motor has been corrected.

Revision C:

•

MUZ-GE15NA-

1

, MUZ-GE18NA-

1

, MUY-GE15NA-

1

, and MUY-GE18NA-

1

have been added.

Revision D:

• Specification has been corrected. [Capacity Capacity Rated (Maximum), Power consumption Power consumption Rated (Maximum)]

Revision E:

• MUZ-GE09NAH, MUZ-GE12NAH, MUZ-GE15NAH and MUZ-GE18NAH have been added.

Revision F:

• MUZ-GE09/12/15NA2, MUZ-GE09/12/15NAH2 and MUY-GE09/12/15NA2 have been added.

Revision G:

• The descriptions of the expansion valve coil have been corrected. (10-4.)

• Some descriptions have been modified.

OBH549G

2

1

TECHNICAL CHANGES

MUZ-GE09NA MUY-GE09NA





1. New model

MUZ-GE15NA MUZ-GE15NA -

1

MUZ-GE18NA MUZ-GE18NA -

1

1. Compressor has been changed.

2. Inverter P.C. board has been changed.

MUY-GE15NA MUY-GE15NA -

1

MUY-GE18NA MUY-GE18NA -

1

1. Compressor has been changed.


MUZ-GE09NA MUZ-GE09NAH

1. Defrost heater has been added.

2. Reactor has been changed.



MUZ-GE15NA -

1

MUZ-GE15NAH

MUZ-GE18NA -

1

MUZ-GE18NAH

1. Defrost heater has been added.


MUZ-GE09NA

MUZ-GE12NA

MUZ-GE09NA2

MUZ-GE12NA2

MUZ-GE15NA -

1

MUZ-GE15NA2

MUZ-GE09NAH MUZ-GE09NAH2

MUZ-GE12NAH

MUZ-GE15NAH

MUY-GE09NA

MUY-GE12NA

MUZ-GE12NAH2

MUZ-GE15NAH2

MUY-GE09NA2

MUY-GE12NA2

MUY-GE15NA -

1

MUY-GE15NA2

1. SEER and HSPF have been added.

OBH549G

3

2

PART NAMES AND FUNCTIONS

MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA

MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2

MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH

MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2

MUY-GE09NA MUY-GE12NA MUY-GE15NA

MUY-GE09NA2 MUY-GE12NA2 MUY-GE15NA2

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

OBH549G

4

MUZ-GE24NA

MUY-GE24NA

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

OBH549G

5

3

SPECIFICATION

Outdoor unit model

Capacity

Rated (Minimum~Maximum)

Cooling 1

Heating 47 1

Btu/h

Btu/h

MUZ-GE09NA

MUZ-GE09NA2

MUZ-GE09NAH

MUZ-GE09NAH2

9,000

( 3,800 ~ 12,200 )

10,900

( 4,500 ~ 14,100 )

MUY-GE09NA

MUY-GE09NA2

9,000

( 3,800 ~ 12,200 )

—

MUZ-GE12NA

MUZ-GE12NA2

MUZ-GE12NAH

MUZ-GE12NAH2

12,000

( 3,800 ~ 13,600 )

14,400

( 5,500 ~ 18,100 )

MUY-GE12NA

MUY-GE12NA2

12,000

( 3,800 ~ 13,600 )

—

Capacity

Rated (Maximum)

Heating 17 2

Power consumption


Cooling 1

Heating 47 1

Btu/h

W

W

6,600 (8,700) — 8,800 (11,200) —

660 (205~1,200) 660 (205~1,200) 960 (205~1,300) 960 (205~1,300)

760 (255~1,200) — 1,170 (340~1,660) —

Power consumption

Rated (Maximum)

Heating 17 2 W 700 (950) — 900 (1,200) —

EER 1 [SEER]

Compressor

3 Cooling

HSPF IV 4 Heating

09NA/H

: 13.6 [ 21.0 ]

09NA

: 13.6 [ 21.0 ]

09NA2/H2

: 13.6 [23.2]

09NA2

: 13.6 [23.2]

09NA/H

: 10.0

09NA2

: 11.0

—

09NAH2

: 10.1

COP Heating 1 4.20

Power supply

Max. fuse size (time delay)

V , phase , Hz

A

Min. circuit ampacity

Fan motor

A

F.L.A

Model KNB073FQDHC

—

R.L.A 6.6

L.R.A 8.2

4.9

6.1

12NA/H

: 12.5 [ 20.5 ]

12NA/H

: 12.5 [ 20.5 ]

12NA2/H2

: 12.5 [22.7]

12NA2/H2

: 12.5 [22.7]

12NA/H

: 10.0

12NA2

: 11.4

—

12NAH2

: 10.8

3.61

208/230 , 1 , 60

15

12

0.50

KNB092FQAHC

—

6.6

8.2

4.9

6.1

Refrigeration oil

(Model)

L 0.32 (NEO22)

Refrigerant control Linear expansion valve

Sound level 1

Cooling dB(A)

Heating dB(A) 50

46

— 51

49

—

Defrost method

Dimensions

W

D

H in.

in.

in.

Reverse cycle

31-1/2

11-1/4

21-5/8

77

External fi nish Munsell 3Y 7.8/1.1

Remote controller

Control voltage (by built-in transformer)

Refrigerant piping

VDC

Wireless type

12 - 24

Not supplied

Refrigerant pipe size

(Min. wall thickness)

Connection method

Liquid in.

Gas in.

Indoor Flared

Outdoor Flared ft.

40

Between the indoor & outdoor units

Height difference

Piping length

Refrigerant charge (R410A) ft.

1 lb. 12 oz.

65

NOTE

: Test conditions are based on AHRI 210/240.

1: Rating conditions (Cooling) — Indoor: 80 ˚ FDB, 67 ˚ FWB, Outdoor: 95 ˚ FDB, (75 ˚ FWB)

(Heating) — Indoor: 70 ˚ FDB, 60 ˚ FWB, Outdoor: 47 ˚ FDB, 43 ˚ FWB

2: (Heating) ˚ FWB, Outdoor: 17 ˚ FDB, 15 ˚ FWB

2 lb. 9 oz.

OBH549G

6

Outdoor unit model

Capacity


Cooling 1

Heating 47 1

Btu/h

Btu/h

MUZ-GE15NA

MUZ-GE15NA-

1

MUZ-GE15NA2

MUZ-GE15NAH

MUZ-GE15NAH2

14,000

( 3,100 ~ 18,200 )

18,000

( 4,800 ~ 20,900 )

MUY-GE15NA

MUY-GE15NA-

MUY-GE15NA2

14,000

1

( 3,100 ~ 18,200 )

—

MUZ-GE18NA

MUZ-GE18NA-

MUZ-GE18NAH

1

17,200

( 3,700 ~ 18,700 )

21,600

( 3,500 ~ 25,200 )

MUY-GE18NA

MUY-GE18NA-

17,200

( 3,700 ~ 18,700 )

—

1

Capacity

Rated (Maximum)

Heating 17 2

Power consumption


Cooling 1

Heating 47 1

Power consumption

Rated (Maximum)

Heating 17 2

Btu/h

W

W

W

11,300 (15,900) — 13,400 (17,200) —

1,080 (160 ~ 2,000) 1,080 (160 ~ 2,000) 1,640 (240 ~ 2,070) 1,640 (240 ~ 2,070)

1,600 (270 ~ 2,010)

1,150 (1,950)

—

—

EER

1

[SEER] 3 Cooling

15NA/H

: 13.0 [ 21.0]

15NA/H

: 13.0 [ 21.0]

15NA2/H2

: 13.6 [ 21.6]

15NA2/H2

: 13.6 [ 21.6]

15NA/H

: 10.0

15NA2

: 11.2

— HSPF IV 4 Heating

15NA2/H2

: 10.8

COP Heating 1 3.30

—

1,900 (230 ~ 2,680)

1,450 (2,080)

10.5 [19.2]

10.0

3.33

—

—

10.5 [19.2]

—

—

208/230 , 1 , 60

15

14

0.93

SNB130FQBH

Power supply



Fan motor

Compressor

Model

(Model)

V , phase , Hz

A

A

F.L.A

12

0.50

MUZ/MUY-GE NA

MUZ/MUY-GE NA2

MUZ/MUY-GE NA-

1

MUZ-GE NAH, NAH2

R.L.A 7.4

L.R.A 9.3

Refrigeration oil

L

Refrigerant control

Sound level 1

Cooling dB(A)

Heating dB(A) 51

49

Defrost method

Dimensions

W

D

H in.

in.

in.

31-1/2

11-1/4

21-5/8

6.8

8.5

SNB130FQBHT

Linear expansion valve

—

0.45 (NEO22)

Reverse cycle

56

10.0

12.5

54

33-1/16

13

33-7/16

119

—

External fi nish

Remote controller


Refrigerant piping

VDC

Munsell 3Y 7.8/1.1

Wireless type

12 - 24

Not supplied



Liquid in.

Gas in.

Connection method


Indoor Flared

Outdoor Flared

Height difference

Piping length


ft.

40

65

2 lb. 9 oz.

50

100

3 lb. 7 oz.

NOTE





OBH549G

7

Outdoor unit model

Compressor


Capacity


Cooling 1

Heating 47 1

Btu/h

Btu/h

22,500

(8,200 ~ 31,400)

27,600

(7,500 ~ 36,900)

22,500

(8,200 ~ 31,400)

—

Capacity

Rated (Maximum)

Heating 17 2

Power consumption


Cooling 1

Heating 47 1

Power consumption

Rated (Maximum)

Heating 17 2


Fan motor

Btu/h

W

W

W

A

F.L.A

16,000 (24,600)

1,800 (570 ~ 3,580) 1,800 (570 ~ 3,580)

2,340 (520 ~ 3,650)

1,770 (3,290)

EER 1 [SEER] 3 Cooling

HSPF IV 4 Heating 10.0

COP Heating 1 3.46

Power supply


V , phase , Hz

A

208/230 , 1 , 60

20

17.1

0.93

—

—

—

—

—

Model SNB172FQKMT

R.L.A 12.9

L.R.A 16.1

Refrigeration oil

(Model)

L 0.40 (FV50S)

Refrigerant control

Sound level

Dimensions

1

Defrost method

Cooling dB(A)

Heating dB(A)

W

D

H in.

in.

in.

Linear expansion valve

55

55 —

Reverse cycle

33-1/16

13

34-5/8

External fi nish

Remote controller


Refrigerant piping

VDC

Munsell 3Y 7.8/1.1

Wireless type

12-24

Not supplied



Connection method


Liquid in.

Gas in.

Indoor Flared

Outdoor Flared

Height difference

Piping length


ft.

50

100

4 lb. 3 oz.

NOTE





OBH549G

8

Test condition

3, 4

ARI

Mode Test

Indoor air condition (°F)

Dry bulb Wet bulb

Outdoor air condition (°F)

Dry bulb Wet bulb

"A-2" Cooling Steady State at rated compressor Speed

"B-2" Cooling Steady State at rated compressor Speed

SEER

(Cooling)

"B-1" Cooling Steady State at minimum compressor Speed

"F-1" Cooling Steady State at minimum compressor Speed

"E-V" Cooling Steady State at Intermediate compressor Speed 5

"H1-2" Heating Steady State at rated compressor Speed

80

80

80

80

80

70

67

67

67

67

67

60

95

82

82

67

87

47

HSPF

(Heating)

(MUZ)

"H3-2" Heating at rated compressor Speed

"H0-1" Heating Steady State at minimum compressor Speed

"H1-1" Heating Steady State at minimum compressor Speed

"H2-V" Heating at Intermediate compressor Speed 5

70

70

70

70

60

60

60

60

17

62

47

35

5 : At Intermediate compressor Speed

= ("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".

(75)

(65)

(65)

(53.5)

(69)

43

15

56.5

43

33

3-1. OPERATING RANGE

(1) POWER SUPPLY

Rated voltage

Outdoor unit

208/230 V

1 phase

60 Hz

Guaranteed voltage (V)

Min. 187 208 230 Max. 253

(2) OPERATION

Mode Condition

Cooling

Heating

(MUZ)

Standard temperature

Maximum temperature

Minimum temperature

Maximum humidity

Standard temperature

Maximum temperature

Minimum temperature

DB

80

90

67

70

80

70

Indoor

78 %

Intake air temperature (°F)

WB

67

73

57

60

67

60

DB

95

115

14

47

75

-4

Outdoor

—

WB

—

—

—

43

65

-5

OBH549G

9

4

OUTLINES AND DIMENSIONS







15-3/4

Air in

Drain hole ø1-5/8

(GE09/12/15NA/NA2)

Drain hole ø1-5/16

(GE09/12/15NAH/NAH2)

REQUIRED SPACE

*1

4 in.

or more when front and sides of the unit are clear

Air in

4 in.

or more

4 in.

or more

Unit: inch

8 in.

or more *2

*2 When any 2 sides of left, right and rear of the unit are clear

14 in.

or more

7/8 handle

Air out

1-9/16

2- 3/8 13/16 Oval hole

29/32 11-1/4 17/32

6-23/32

Liquid pipe :1/4 (flared)

Gas pipe :3/8 (flared)

(GE09/12)

1/2 (flared)

(GE15)

5-15/16

11-29/32

19-11/16

31-1/2 2-23/32

OBH549G

10

MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA

Drain 3 holes

ø1-5/16

(GE18NA)

20-9/32

11-25/32

2-19/32

Air in

Air in

Drain hole

ø1-5/16

(GE18NAH)

Air out

19-11/16

33-1/16

4-25/32

Unit: inch

1-9/16

4-3/8 × 13/16 slot

3-3/16

REQUIRED SPACE

*1

20 in.

more when front

and sides of the unit are clear

4 in.

or more

4 in

. or more

14 in

. or more

20 in.

or more *2

*2 When any 2 sides of left, right

and rear of the unit are clear

35°

30°

8-11/32

Liquid:1/4(flared)

Gas :1/2(flared)

OBH549G

11

MUZ-GE24NA

MUY-GE24NA

16-7/16

Air in

Drain hole

1-9/16

1-5/8

REQUIRED SPACE

*1

20 in.

or more when front and sides of the unit are clear

4 in.

or more

4 in.

or more

6-7/8

Air out

19-11/16

33-1/16

4-5/16

2-holes 13/32 13/16

3-3/16

14 in.

or more

20 in.

or more *2

*2 When any 2 sides of left, right and rear of the unit are clear

Service panel

Liquid refrigerant pipe joint

Refrigerant pipe (flared)

Ø

3/8

7-11/16

44

35

Gas refrigerant pipe joint

Refrigerant pipe (flared)

Ø

5/8

Unit: inch

OBH549G

12

5

WIRING DIAGRAM

MUZ-GE09NA MUZ-GE12NA

MUZ-GE09NA2 MUZ-GE12NA2

OBH549G

13

MUZ-GE09NAH MUZ-GE12NAH

MUZ-GE09NAH2 MUZ-GE12NAH2

OBH549G

14

MUY-GE09NA MUY-GE12NA

MUY-GE09NA2 MUY-GE12NA2

OBH549G

15

MUZ-GE15NA

MUZ-GE15NA-

1

OBH549G

16

MUZ-GE15NA2

MUZ-GE15NAH

OBH549G

17

MUZ-GE15NAH2

MUY-GE15NA

OBH549G

18

MUY-GE15NA-

1

MUY-GE15NA2

OBH549G

19

MUZ-GE18NA

MUZ-GE18NA-

1

OBH549G

20

MUZ-GE18NAH

MUY-GE18NA

OBH549G

21

MUY-GE18NA-

1

OBH549G

22

MUZ-GE24NA

OBH549G

23

MUY-GE24NA

OBH549G

24

6

REFRIGERANT SYSTEM DIAGRAM

MUZ-GE09NA MUZ-GE09NA2


MUY-GE09NA MUY-GE09NA2

Refrigerant pipe ø3/8

(with heat insulator)

Muffler

Flared connection

4-way valve

Stop valve

(with service port)

Service port

Discharge temperature thermistor

RT62

Muffler

Service port

Compressor

Defrost thermistor

RT61

(

MUZ

)

Outdoor heat exchanger

Outdoor heat exchanger temperature thermistor

RT68

Ambient temperature thermistor

RT65

Unit: inch

Flared connection

Capillary tube

O.D. 0.118 × I.D. 0.079

× 9-7/16

(ø3.0 × ø2.0 × 240)

LEV

Strainer

#100

R.V. coil (

MUZ

) heating ON cooling OFF



Stop valve

(with strainar)

Refrigerant flow in cooling

Refrigerant flow in heating (

MUZ

)

MUZ-GE12NA MUZ-GE12NA2 MUZ-GE15NA MUZ-GE15NA2

MUZ-GE12NAH MUZ-GE12NAH2 MUZ-GE15NAH MUZ-GE15NAH2

MUY-GE12NA MUY-GE12NA2 MUY-GE15NA MUY-GE15NA2


(GE12NA)


(GE15NA)


Muffler

4-way valve

Flared connection

Stop valve

(with service port)


RT62

Service port

Muffler

Service port

Compressor

Defrost thermistor

RT61

(

MUZ

)



RT68


RT65

Flared connection

Capillary tube

O.D. 0.118 × I.D. 0.079

× 9-7/16

(ø3.0 × ø2.0 × 240)

LEV

Capillary tube

O.D. 0.118 × I.D. 0.071

× 23-5/8

(ø3.0 × ø1.8 × 600) (×2)

Strainer

#100

R.V. coil (

MUZ

) heating ON cooling OFF



Stop valve

(with strainar)

OBH549G

25



MUZ

)

MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA



4-way valve

Muffler

#100

Flared connection

Stop valve

(with service port)

Service port


RT62

Service port

Defrost thermistor

RT61

(

MUZ

)



RT65

Unit: inch

Flared connection

Receiver



Stop valve

(with strainar)

Compressor


RT68

LEV

Strainer

#100

Capillary tube

O.D. 0.142 × I.D. 0.094

× 1-31/32

(ø 3.6×ø2.4×50)

R.V. coil

(

MUZ

heating ON cooling OFF

)


Refrigerant flow in heating

(

MUZ

)

MUZ-GE24NA

MUY-GE24NA



4-way valve

Muffler

#100

Service port

Flared connection

Stop valve

(with service port)

Service port


RT62

Defrost thermistor

RT61

(

MUZ

)



RT65

Flared connection

Strainer

#100

Stop valve



Compressor


RT68

LEV

Strainer

#100

Capillary tube

O.D.0.157 × I.D.0.094

× 3-15/16

(ø 4.0×ø2.4×100)

R.V. coil (

MUZ

heating ON cooling OFF

)



MUZ

)

OBH549G

26

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Model

Refrigerant piping: ft.

Max. Length

A

Max. Height difference

B

Gas

Piping size O.D: in.

Liquid

MUZ-GE09/12/15NA/NA2

MUZ-GE09/12/15NAH/NAH2

MUY-GE09/12/15NA/NA2

MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA

MUZ-GE24NA

MUY-GE24NA

65 40

100 50

100 50

3/8

(GE09/12)

1/2

(GE15)

1/2

5/8

1/4

3/8

Indoor unit

Max. Height difference

B

Max. Length

A

Outdoor unit

ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)

NOTE

: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.

Model

Outdoor unit precharged

25 30

Refrigerant piping length (one way): ft.

40 50 60

MUZ-GE09NA/NA2


MUY-GE09NA/NA2

MUZ-GE12NA/NA2


MUY-GE12NA/NA2

MUZ-GE15NA/NA2


MUY-GE15NA/NA2

1 lb. 12 oz.

2 lb. 9 oz.

0 1.62

4.86

8.10

11.34

Model


25 30

65

12.96

Calculation: X oz. = 1.62/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)

40


50 60 70 80 90 100

MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA

3 lb. 7 oz.

0 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20


NOTE

: Refrigerant piping exceeding 33 ft. requires additional refrigerant charge according to the calculation.

Model


33 40


50 60 70 80 90

MUZ-GE24NA

MUY-GE24NA

4 lb. 3 oz.

0 4.14

10.06

15.98

21.90

27.82

33.74

100

39.66


OBH549G

27

7 DATA

7-1. PERFORMANCE DATA

1) COOLING CAPACITY

MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA


MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE18NAH


MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA


MUZ-GE24NA

MUY-GE24NA

Model

MUZ-GE09NA/NA2


MUY-GE09NA/NA2

MUZ-GE12NA/NA2


MUY-GE12NA/NA2

MUZ-GE15NA/NA2


MUY-GE15NA/NA2

MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA

MUZ-GE24NA

MUY-GE24NA

Indoor air

IWB (

71

67

63

63

71

67

63

67

63

71

67

71

67

63

71

˚ F)

Outdoor intake air DB temperature ( ˚ F)

75 85 95 105 115

TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC

11.0

7.6 0.59 10.3 7.1 0.64 9.7

6.6 0.69 9.0

6.2 0.73 8.3

5.7 0.76

10.4 8.6 0.55 9.7

8.0 0.61 9.0

7.4 0.66 8.4

6.9 0.70 7.7

6.3 0.73

9.8

9.4 0.53 9.1

8.7 0.58 8.5

8.1 0.63 7.7

7.3 0.67 7.0

6.7 0.70

14.7 8.9 0.85 13.7 8.3 0.94 12.9 7.8 1.01 12.0 7.3 1.06 11.0

6.7 1.10

13.9 10.3 0.81 13.0 9.6 0.89 12.0 8.9 0.96 11.2

8.3 1.02 10.3 7.6 1.07

13.1 11.4 0.77 12.1 10.6 0.85 11.3

9.9 0.92 10.3 9.0 0.98 9.4

8.2 1.02

17.2 11.4 0.96 16.0 10.7 1.05 15.1 10.0 1.13 14.0 9.3 1.19 12.9 8.6 1.24

16.2 13.0 0.91 15.1 12.1 1.00 14.0 11.2 1.08 13.0 10.4 1.14 12.0 9.6 1.20

15.3 14.2 0.86 14.1 13.2 0.96 13.2 12.3 1.03 12.0 11.2 1.10 10.9 10.2 1.14

21.1 12.2 1.46 19.7 11.4 1.60 18.5 10.7 1.72 17.2 9.9 1.81 15.8 9.1 1.89

20.0 14.2 1.38 18.6 13.2 1.52 17.2 12.2 1.64 16.0 11.4 1.74 14.7 10.4 1.82

18.7 15.8 1.31 17.4 14.7 1.45 16.2 13.6 1.57 14.7 12.4 1.67 13.4 11.3 1.74

27.6 17.0 1.60 25.8 15.9 1.76 24.2 14.9 1.89 22.5 13.9 1.99 20.7 12.8 2.07

26.1 19.6 1.51 24.3 18.2 1.67 22.5 16.9 1.80 20.9 15.7 1.91 19.2 14.4 2.00

24.5 21.7 1.44 22.7 20.1 1.59 21.2 18.7 1.72 19.2 17.0 1.84 17.6 15.5 1.91

NOTE

: 1. IWB: Intake air wet-bulb temperature

TC: Total Capacity (×10

3

Btu/h)

SHC: Sensible Heat Capacity (×10 3 Btu/h)

TPC: Total Power Consumption (kW)

2. SHC is based on 80 ˚ F of indoor Intake air DB temperature.

2) COOLING CAPACITY CORRECTIONS

Refrigerant piping length (one way: ft.)

25 (std.) 40 65 100

MUZ-GE09NA/NA2


MUY-GE09NA/NA2

MUZ-GE12NA/NA2


MUY-GE12NA/NA2

MUZ-GE15NA/NA2


MUY-GE15NA/NA2

MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA

1.0

0.954

0.878

—

MUZ-GE24NA

MUY-GE24NA

1.0

0.954

0.878

0.771

OBH549G

28

3) HEATING CAPACITY (MUZ)

Model

MUZ-GE09NA

MUZ-GE09NA2

MUZ-GE09NAH

MUZ-GE09NAH2

MUZ-GE12NA

MUZ-GE12NA2

MUZ-GE12NAH

MUZ-GE12NAH2

MUZ-GE15NA

MUZ-GE15NA2

MUZ-GE15NAH

MUZ-GE15NAH2

MUZ-GE18NA

MUZ-GE18NAH

MUZ-GE24NA

Indoor air

IDB (

70

65

75

70

75

70

65

75

65

75

70

65

65

75

70

65

70

65

75

70

75

70

65

75

75

70

65

˚ F)

5 15

Outdoor intake air WB temperature ( ˚ F)

25 35 43 45 55

TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC

4.8

0.45

6.3

0.57

7.9

0.67

9.4

0.74 10.6 0.78 11.0 0.79 12.4 0.82

5.2

0.43

6.7

0.55

8.2

0.65

9.6

0.72 10.9 0.76 11.2 0.78 12.7 0.81

5.5

0.41

6.9

0.52

8.6

0.63 10.0 0.70 11.2 0.74 11.6 0.75 13.0 0.79

4.8

0.58

6.3

0.70

7.9

0.80

9.4

0.74 10.6 0.78 11.0 0.79 12.4 0.82

5.2

0.56

6.7

0.68

8.2

0.78

9.6

0.72 10.9 0.76 11.2 0.78 12.7 0.81

5.5

0.54

6.9

0.65

8.6

0.76 10.0 0.70 11.2 0.74 11.6 0.75 13.0 0.79

6.3

0.69

8.4

0.87 10.4 1.02 12.5 1.14 14.0 1.20 14.5 1.22 16.4 1.26

6.8

0.66

8.9

0.84 10.8 1.00 12.7 1.11 14.4 1.17 14.8 1.19 16.8 1.24

7.2

0.63

9.1

0.81 11.3 0.97 13.2 1.08 14.8 1.14 15.3 1.16 17.1 1.22

6.3

0.82

8.4

1.00 10.4 1.15 12.5 1.14 14.0 1.20 14.5 1.22 16.4 1.26

6.8

0.79

8.9

0.97 10.8 1.13 12.7 1.11 14.4 1.17 14.8 1.19 16.8 1.24

7.2

0.76

9.1

0.94 11.3 1.10 13.2 1.08 14.8 1.14 15.3 1.16 17.1 1.22

7.9

0.63 10.4 0.79 13.1 0.93 1.56 1.03 17.6 1.09 18.1 1.10 20.5 1.14

8.6

0.60 11.1 0.76 13.5 0.91 15.9 1.01 18.0 1.06 18.5 1.08 21.0 1.12

9.0

0.57 11.3 0.73 14.1 0.87 16.5 0.98 18.5 1.03 19.1 1.05 21.4 1.10

7.9

0.76 10.4 0.92 13.1 1.06 15.6 1.03 17.6 1.09 18.1 1.10 20.5 1.14

8.6

0.73 11.1 0.89 13.5 1.04 15.9 1.01 18.0 1.06 18.5 1.08 21.0 1.12

9.0

0.70 11.3 0.86 14.1 1.00 16.5 0.98 18.5 1.03 19.1 1.05 21.4 1.10

9.1

0.64 11.9 0.81 14.9 0.95 17.8 1.06 20.1 1.12 20.7 1.13 23.5 1.18

9.8

0.62 12.7 0.78 15.5 0.93 18.2 1.04 20.6 1.09 21.2 1.11 24.0 1.16

10.3 0.59 13.0 0.75 16.2 0.90 18.8 1.01 21.2 1.06 21.8 1.08 24.5 1.13

9.1

0.77 11.9 0.94 14.9 1.08 17.8 1.06 20.1 1.12 20.7 1.13 23.5 1.18

9.8

0.75 12.7 0.91 15.5 1.06 18.2 1.04 20.6 1.09 21.2 1.11 24.0 1.16

10.3 0.72 13.0 0.88 16.2 1.03 18.8 1.01 21.2 1.06 21.8 1.08 24.5 1.13

12.1 1.38 16.0 1.74 20.0 2.05 23.9 2.28 26.9 2.40 27.7 2.43 31.5 2.53

13.1 1.32 17.0 1.68 20.7 2.00 24.4 2.22 27.6 2.34 28.4 2.39 32.2 2.48

13.8 1.26 17.4 1.61 21.7 1.93 25.3 2.16 28.4 2.28 29.3 2.32 32.8 2.43

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.

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 with operational frequency.

3. The fan speed of the indoor unit is High.

4. This operation continues for 30 minutes.

5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on the remote controller.

OBH549G

29

7-2. PERFORMANCE CURVE

Cooling

Cooling capacity

(at Rated frequency)

1.5

1.4

Indoor intake air WB temperature( F)

1.3

1.2

79

1.1

75

1.0

0.5

65

0.9

104 113

72

68

64

14 23 32 41 50 59 68 77 86

Outdoor intake air DB temperature(°F)

MUZ-GE09NA

MUZ-GE09NAH

MUY-GE09NA

SHF at rating condition = 0.76

Airflow = 307 CFM

0.8

MUZ-GE09NA2

MUZ-GE09NAH2

MUY-GE09NA2

0.7

0.6

Indoor intake air WB temperature (°F)

75 85 95 105

Outdoor intake air DB temperature (°F)

71

67

63

115

95

MUZ-GE12NA

MUZ-GE12NAH

MUY-GE12NA

1.3

1.2

1.1

1.0

0.9

0.8

0.7

65

MUZ-GE12NA2

MUZ-GE12NAH2

MUY-GE12NA2


Airflow = 350 CFM


75 85 95 105


71

67

63

115

MUZ-GE15NA

MUZ-GE15NAH

MUY-GE15NA

MUZ-GE15NA2

MUZ-GE15NAH2

MUY-GE15NA2


Airflow

= 498 CFM

1.4

1.3

1.2

1.1

1.0

0.9

0.8


71

67

63

65 75 85 95 105


115

MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA


Airflow

= 498 CFM

2.0

1.9

1.8

1.7

1.6

1.5

1.4

1.3


65 75 85 95 105


115

71

67

63

MUZ-GE24NA

MUY-GE24NA


Airflow

= 634 CFM

2.2

2.1

2.0

1.9

1.8

1.7

1.6

1.5

1.4

1.3

65


75 85 95 105


115

71

67

63

OBH549G

30

Heating (MUZ)

Heating capacity

(at Rated frequency)

0.9

0.8

0.7

0.6

0.5

0.4

1.3

1.2

1.1

1.0

-4

Indoor intake air DB temperature ( F)

5 14 23 32 41

Outdoor intake air WB temperature (°F)

50


Airflow = 413 CFM

1.2

1.0

0.8

0.6

0.4

0.2

0

Indoor intake air DB temperature (°F)

10 20 30 40 50

Outdoor intake air WB temperature (°F)

60


70

75

70

65

1.4

1.2

1.0

0.8

0.6

0.4

0


Airflow = 413 CFM

75

70

65

10 20 30 40 50


60


70

Airflow = 463 CFM

2.0

1.7

1.4

1.1

0.8

0.5

0


10 20 30 40 50


60

75

70

65

70

59

68

79

59


Airflow = 413 CFM

1.2

1.0

0.8

0.6

0.4

0.2

0


10 20 30 40 50


60


70

75

70

65

1.4

1.2

1.0

0.8

0.6

0.4

0


Airflow = 413 CFM

75

70

65

10 20 30 40 50


60


70

Airflow = 463 CFM

2.0

1.7

1.4

1.1

0.8

0.5

0


10 20 30 40 50


60

75

70

65

70

This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity.

OBH549G

31


2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0


Airflow = 512 CFM

75

70

65

10 20 30 40 50


60

MUZ-GE24NA

70

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0


Airflow = 512 CFM

70

65

10 20 30 40 50


60

Airflow = 738 CFM

3.0

2.6

2.2

1.8

1.4

1.0

0


75

70

65

10 20 30 40 50


60 70

This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity.

70

7-3. CONDENSING PRESSURE

Cooling

Data is based on the condition of indoor humidity 50 %.

Air flow should be set to High speed.

MUZ-GE09NA

MUZ-GE09NAH

MUY-GE09NA

MUZ-GE09NA2

MUZ-GE09NAH2

MUY-GE09NA2

(PSIG)

440

(PSIG)

200

86

Indoor DB temperature (°F)

400

360

180

160

80

75

70

320


280

6870 75 80 85 90 95 100 105

(°F)

Outdoor ambient temperature

140

120

68 70 75 80 85 90 95 100 105

(°F)


OBH549G

32

MUZ-GE12NA

MUZ-GE12NAH

MUY-GE12NA

MUZ-GE12NA2

MUZ-GE12NAH2

MUY-GE12NA2

(PSIG)

420

(PSIG)

190

380

340

170

150


86

80

75

70

300


260

6870 75 80 85 90

95

100 105

(°F)


MUZ-GE15NA

MUZ-GE15NAH

MUY-GE15NA

(PSIG)

440

MUZ-GE15NA2

MUZ-GE15NAH2

MUY-GE15NA2

400

86

80

75

70

130

110

6870 75 80 85 90

95

100 105

(°F)


(PSIG)

200

180

360

160


86

80

75

70

320


280

6870 75 80 85 90

95

100 105

(°F)


MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA

(PSIG)

430

86

80

75

70

390

140

120

68 70 75 80 85 90 95 100 105(°F)


(PSIG)

160

145

86

80

75

70

350 130


310

270

6870 75 80 85 90 95 100 105(°F)


115


100

6870 75 80 85 90 95 100 105(°F)


OBH549G

33

MUZ-GE24NA

MUY-GE24NA

(PSIG)

480

450

420

390

360


86

80

75

70

330

300

270

6870 75 80 85 90

95

100 105

(°F)


(PSIG)

180

170

160

150

140

86

80

75

70

130

120


110

6870 75 80 85 90

95

100 105

(°F)


Heating (MUZ)

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.

MUZ-GE09NA

MUZ-GE09NAH

(PSIG)

370

345

MUZ-GE09NA2

MUZ-GE09NAH2

75

70

65

(PSIG)

210

185

320


295

270

245

58Hz

220

5 15 25 35 45 55


65 75 (°F)

75

70

65

160

135

110


58Hz

85

60

5 15 25 35 45 55


65 75 (°F)

OBH549G

34

MUZ-GE12NA

MUZ-GE12NAH

(PSIG)

460

MUZ-GE12NA2

MUZ-GE12NAH2

420

380

340

300


58Hz

260

5 15 25 35 45 55


65 75 (°F)

MUZ-GE15NA

MUZ-GE15NAH

(PSIG)

440

MUZ-GE15NA2

MUZ-GE15NAH2

75

70

65

404

368

332

296


54Hz

260

5 15 25 35 45 55


65 75 (°F)

75

70

65

(PSIG)

210

185

75

70

65

160

135


110

85

58Hz

60

5 15 25 35 45 55


65 75 (°F)

(PSIG)

210

185

75

65

160

135


110

85

54Hz

60

5 15 25 35 45 55


65 75 (°F)

OBH549G

35

MUZ-GE18NA

MUZ-GE18NAH

(PSIG)

500

475

450

425

400

375

350

325

300

5


58Hz

75

70

65

15 25 35 45 55


65 75(°F)

MUZ-GE24NA

(PSIG)

450

425

400

375

350

325

300

275

250

5


58Hz

75

70

65

15 25 35 45 55


65 75 (°F)

(PSIG)

210

185

75

70

65

160

135


110

85

58Hz

60

5 15 25 35 45 55


65 75 (°F)

(PSIG)

210

190

170

150

130

110

90

70

50

5


58Hz

75

70

65

15 25 35 45 55


65 75 (°F)

OBH549G

36

7-4. STANDARD OPERATION DATA

Model

Item

Capacity

SHF

Input

Rated frequency

Indoor unit

Power supply (V, Phase, Hz)

Input

Fan motor current

Unit

Btu/h

kW

Hz kW

A

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 (R410A)

Intake air temperature

Discharge air temperature

Fan speed (High)

Air fl ow (High)


Fan speed

Air fl ow kW

A

A

PSIG

DB

WB °F

DB °F

WB °F rpm

°F ft.

-

°F

PSIG

°F

°F

°F

DB

CFM

°F

WB °F rpm

CFM

MSZ-GE09NA

MSY-GE09NA

Cooling

9,000

0.82

0.660

MSZ-GE09NA

Heating

10,900

—

0.760

MSZ-GE12NA

MSY-GE12NA

Cooling

12,000

0.74

0.960

MSZ-GE12NA

Heating

14,400

—

1.170

59.5

77.5

MSZ-GE09NA, MSY-GE09NA

0.022

69.0

77.0


0.023

208/230, 1, 60

0.022

0.023

0.25/0.23

0.25/0.23

0.24/0.22

MUZ-GE09NA

MUZ-GE09NA2

MUZ-GE09NAH

MUZ-GE09NAH2

MUY-GE09NA

MUY-GE09NA2

MUZ-GE09NA

MUZ-GE09NA2

MUZ-GE09NAH

MUZ-GE09NAH2

0.24/0.22

MUZ-GE12NA

MUZ-GE12NA2

MUZ-GE12NAH

MUZ-GE12NAH2

MUY-GE12NA

MUY-GE12NA2

MUZ-GE12NA

MUZ-GE12NA2

MUZ-GE12NAH

MUZ-GE12NAH2

0.638

3.32/3.00

0.27/0.24

389

0.737

208/230, 1, 60

0.938

3.66/3.31

0.30/0.27

331

4.39/3.97

0.34/0.31

389

1.147

5.41/4.89

0.31/0.28

397

151

154

115

59

151

103

152

103

39

149

133

163

115

56

158

104

162

116

35

158

25

80

67

60

58

1,020

367 (Wet)

95

—

800

1151

1 lb. 12 oz.

70

60

97

—

1,040

413

47

43

850

1225

80

67

56

55

1,020

367 (Wet)

95

—

900

1229

2 lb. 9 oz.

70

60

108

—

1,040

413

47

43

860

1172

OBH549G

37

Model

Item

Capacity

SHF

Input

Rated frequency

Indoor unit


Input

Fan motor current

Outdoor unit


Input

Comp. current

Fan motor current

Condensing pressure

Suction pressure



Suction temperature


Ref. pipe length




Fan speed (High)

Air fl ow (High)


Fan speed

Air fl ow

DB

WB

DB

WB

DB

WB kW

A

A

PSIG

°F ft.

-

°F

PSIG

°F

°F

°F

CFM

°F

°F rpm

°F

°F

°F rpm

CFM

Unit

Btu/h

kW

Hz kW

A

MSZ-GE15NA

MSY-GE15NA

Cooling

14,000

0.80

1.080

MSZ-GE15NA

Heating

18,000

—

1.600

MSZ-GE18NA

MSY-GE18NA

Cooling

17,200

0.71

1.640

MSZ-GE18NA

Heating

21,600

—

1.900

55.5

74.0


0.045

83.0

84.0


0.031

208/230, 1, 60

0.043

0.037

0.35/0.32

0.43/0.39

0.40/0.36

0.50/0.45

MUZ-GE15NA, -

1

MUZ-GE15NA2

MUZ-GE15NAH

MUZ-GE15NAH2

MUY-GE15NA, -

1

MUY-GE15NA2

MUZ-GE15NA, -

MUZ-GE15NA2

MUZ-GE15NAH

MUZ-GE15NAH2

1

MUZ-GE18NA, -

MUZ-GE18NAH

MUY-GE18NA, -

1

1

MUZ-GE18NA, -

MUZ-GE18NAH

1

1,035

4.86/4.40

0.33/0.30

400

1,569

208/230, 1, 60

1,595

7.38/6.67

0.34/0.31

431

6.97/6.29

0.80/0.72

376

1,860

8.36/7.55

0.64/0.59

458

139

164

117

57

148

99

179

122

31

165

117

177

112

59

164

102

184

127

33

170

25

2 lb. 9 oz.

3 lb. 7 oz.

80

67

60

57

1,280

498 (Wet)

95

—

910

1,243

70

60

114

—

1,140

463

47

43

900

1,229

80

67

56

54

1,280

498 (Wet)

95

—

780

1,730

70

60

117

—

1,240

512

47

43

740

1,659

OBH549G

38

Model

Item

Capacity

SHF

Input

Rated frequency

Indoor unit


Input

Fan motor current

Outdoor unit kW

A


Input

Comp. current

Fan motor current

Condensing pressure

Suction pressure



Suction temperature


Ref. pipe length




Fan speed (High)

Air fl ow (High)


Fan speed

Air fl ow

DB

-

°F

WB °F

DB °F

°F

°F

°F ft.

kW

A

A

PSIG

PSIG

°F

WB °F rpm

DB

CFM

°F

WB °F rpm

CFM

Unit

Btu/h

kW

Hz

MSZ-GE24NA

MSY-GE24NA

Cooling

22,500

0.75

1.800

66.5

MSZ-GE24NA

Heating

27,600

—

2.340

82.0


208/230, 1, 60

0.058

0.56/0.51

MUZ-GE24NA

MUY-GE24NA

MUZ-GE24NA

208/230, 1, 60

1.742

7.01/6.34

2.282

9.59/8.67

1.61/1.05

395

141

158

1.13/1.02

405

102

171

115

52

140

33

148

25

4 lb. 3 oz.

80

67

56

53

70

60

111

—

1,300

634 (Wet)

95

—

840

1,769

738

47

43

810

1,701

OBH549G

39

7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY

MUZ-GE09NA

MUZ-GE09NAH

MUY-GE09NA

MUZ-GE09NA2

MUZ-GE09NAH2

MUY-GE09NA2

Correction of Cooling capacity

Correction of Cooling total input

1.5

2.0

2.0

MUZ-GE09NA

MUZ-GE09NAH

MUZ-GE09NA2

MUZ-GE09NAH2

Correction of Heating capacity

2.0

Correction of Heating total input

1.5

1.5

1.5

1.0

0.5

1.0

0.5

1.0

0.5

1.0

0.5

(Hz)

The operational frequency of compressor

0 50 100 150

(Hz)


0 50 100 150 (Hz)


0 50 100 150 (Hz)


MUZ-GE12NA

MUZ-GE12NAH

MUY-GE12NA

MUZ-GE12NA2

MUZ-GE12NAH2

MUY-GE12NA2



1.5

1.5

1.5

MUZ-GE12NA

MUZ-GE12NAH

MUZ-GE12NA2

MUZ-GE12NAH2


1.5


1.0

0.5

1.0

0.5

1.0

0.5

1.0

0.5

1.0

0.5

(Hz)


0 50 100 150 (Hz)


0 50 100 150 (Hz)


MUZ-GE15NA

MUZ-GE15NAH

MUY-GE15NA

2.0

MUZ-GE15NA2

MUZ-GE15NAH2

MUY-GE15NA2


2.0


1.5

MUZ-GE15NA

MUZ-GE15NAH

0 50 100 150

(Hz)


MUZ-GE15NA2

MUZ-GE15NAH2


1.5


1.5

1.5

1.0

1.0

1.0

0.5

1.0

0.5

0.5

0.5

0 50 100 150 (Hz)


0 50 100 150 (Hz)


0 50 100 150

(Hz)


0 50 100 150 (Hz)


MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA


1.5

1.5


1.5

MUZ-GE18NA

MUZ-GE18NAH


1.5


1.0

0.5

1.0

0.5

1.0

0.5

(Hz)


0 50 100 150 (Hz)


0 50 100 150 (Hz)


0 50 100 150 (Hz)


OBH549G

40

MUZ-GE24NA

MUY-GE24NA


1.5

1.0

0.5

1.5

1.0

0.5

2.5


2.0

1.5

1.0

0.5

MUZ-GE24NA


2.0


1.5

1.0

0.5

0 50 100 150(Hz)


0 50 100 150(Hz)


0 50 100 150(Hz)


0 50 100 150(Hz)


7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation)

1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice).

2. Test run operation starts and continues to operate for 30 minutes.

3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode.

4. Indoor fan operates at High speed.

5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies).

6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on remote controller.

OBH549G

41

8

ACTUATOR CONTROL





8-1. OUTDOOR FAN MOTOR CONTROL

The fan motor turns ON/OFF, interlocking with the compressor.

[ON] The fan motor turns ON 5 seconds before the compressor starts up.

[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

5 seconds 15 seconds

ON

Compressor

OFF

ON

Outdoor fan motor

OFF

8-2. R.V. COIL CONTROL (MUZ)

Heating . . . . . . . . . . . . . . . . . ON

Cooling . . . . . . . . . . . . . . . . . OFF

Dry . . . . . . . . . . . . . . . . . . . . OFF

NOTE

: The 4-way valve reverses for 5 seconds right before start-up of the compressor.

<COOL> <HEAT>

5 seconds 5 seconds

Compressor

ON

OFF

R.V.coil

ON

OFF

Outdoor fan

ON motor

OFF

8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR

Sensor


Indoor coil temperature thermistor

Defrost thermistor

(MUZ)

Fin temperature thermistor



OBH549G

Protection

Purpose

Cooling: Coil frost prevention

Heating: High pressure protection

Heating: Defrosting

Protection

Cooling: Low ambient temperature operation

Cooling: Low ambient temperature operation

Cooling: High pressure protection

Compressor LEV

Outdoor fan motor

R.V.coil

(MUZ)

Indoor fan motor

○ ○

○

○ ○

○ ○ ○ ○ ○

○ ○

○ ○ ○

○ ○ ○

○ ○ ○

42

Actuator

9

SERVICE FUNCTIONS





9-1. CHANGE IN DEFROST SETTING (MUZ)

Changing defrost finish temperature

<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 10-6.1.)

Jumper

MUZ-GE09

Defrost fi nish temperature

MUZ-GE12 MUZ-GE15 MUZ-GE18 MUZ-GE18/24

JS

Soldered

(Initial setting)

None

(Cut)

41°F (5°C)

46°F (8°C)

50°F (10°C)

55°F (13°C)

41°F (5°C)

50°F (10°C)

48°F (9°C)

64°F (18°C)

50°F (10°C)

64°F (18°C)

9-2. PRE-HEAT CONTROL SETTING

PRE-HEAT CONTROL

When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature.

The pre-heat control prevents this interference. The pre-heat control turns ON when the discharge temperature thermistor is 68°F (20°C) or below. When pre-heat control turns ON, compressor is energized. (About 50 W)

Pre-heat control setting

<JK> ON: To activate the pre-heat control, cut the JK wire of the inverter P.C. board. (Refer to 10-6.1.)

OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board. (Refer to 10-6.1.)

NOTE:

When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.

OBH549G

43

10

TROUBLESHOOTING





10-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for miswiring.

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board.

3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.

4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.

5) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires.

<Incorrect> <Correct>

Lead wiring

Connector housing

3. Troubleshooting procedure

1) Check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality.

To make sure, check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting service work.

2) Before servicing, check that the connector and terminal are connected properly.

3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.

4) Refer to 10-2. and 10-3.

OBH549G

44

10-2. FAILURE MODE RECALL FUNCTION

Outline of the function

This air conditioner can memorize the abnormal condition which has occurred once.

Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details can be recalled.

1. Flow chart of failure mode recall function for the indoor/outdoor unit

MSZ-GE06/09/12/15/18NA

MSZ-GE24NA

MSY-GE09/12/15/18NA

MSY-GE24NA

Operational procedure

The cause of abnormality cannot be found because the abnormality does not recur.

Setting up the failure mode recall function

Turn ON the power supply.

<Preparation of the remote controller>

While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.

First, release RESET button.

Hold down the other two buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right fi gure are all displayed. Then release the buttons.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1

Does the upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds?

Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the upper lamp of OPERATION INDICATOR lamp. 2

Judgment of indoor/outdoor abnormality

Yes

(Blinks)

Before blinking, does the upper lamp of OPERATION INDICA-

TOR lamp stay ON for 3 seconds?

When it stays ON for 3 seconds (without beep):

The outdoor unit is abnormal.

No

No

(OFF)

Yes

The indoor unit is abnormal.

Check the blinking pattern, and identify the abnormal point by referring to indoor unit failure mode table. (Refer to indoor unit service manual.)

Make sure to check at least two consecutive blinking cycles. 2

1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Indoor unit is normal.

But the outdoor unit might be abnormal because there are some abnormalities that cannot be recalled with this way.

Check if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to 10-2.2)


Check the blinking pattern, and identify the abnormal point by referring to outdoor unit failure mode table. (Refer to 10-2.3)


Releasing the failure mode recall function

Release the failure mode recall function by the following procedures.

Turn OFF the power supply and turn it ON again.

Press RESET button of the remote controller.

Repair the failure parts.

Deleting the memorized abnormal condition

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.

Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.

NOTE:

1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

2. Blinking pattern when the indoor unit is abnormal:

2.5-second OFF

Blinking at 0.5second interval 2.5-second OFF

Blinking at 0.5second interval

ON

OFF

Beeps

Repeated cycle

Beeps

Repeated cycle

Beeps

Repeated cycle

3.Blinking pattern when the outdoor unit is abnormal:

Blinking at 0.5-

2.5-second OFF 3-second ON second interval

ON

OFF

No beep

Repeated cycle

Beeps

OBH549G

2.5-second OFF

45

3-second ON

No beep

Repeated cycle


Beeps

Repeated cycle

2. Flow chart of the detailed outdoor unit failure mode recall function

Operational procedure

The outdoor unit might be abnormal.

Check if outdoor unit is abnormal according to the following procedures.

Make sure that the remote controller is set to the failure mode recall function.

With the remote controller headed towards the indoor unit, press TOO

COOL or TOO WARM button to adjust the set temperature to 77°F (25°C).

1

Does the upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds?

Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the upper lamp of OPERATION INDICATOR lamp. 2

Yes

(Blinks

)

No

(OFF)


Check the blinking pattern, and identify the abnormal point by referring to outdoor unit failure mode table (10-2.3.).


Releasing the failure mode recall function

Release the failure mode recall function by the following procedures.

Turn OFF the power supply and turn it ON again.

Press RESET button of the remote controller.

1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.

The outdoor unit is normal.

Release the failure mode recall function according to the left mentioned procedure.

Repair the failure parts.

Deleting the memorized abnormal condition

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" (10-2.1.).

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.

Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.

NOTE

: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

2.Blinking pattern when outdoor unit is abnormal:

2.5-second OFF 3-second ON

ON

OFF

No beep

Repeated cycle


Beeps

2.5-second OFF 3-second ON

No beep

Repeated cycle


Beeps

Repeated cycle

OBH549G

46

3. Outdoor unit failure mode table

OPERATION

INDICATOR upper lamp

(Indoor unit)

Abnormal point

(Failure mode / protection)

LED indication

(Outdoor P.C. board)

2-time

2.5 seconds

OFF

3-time

OFF fl fl

ash

ash

2.5 seconds

Outdoor power system


Defrost thermistor

(MUZ)

Fin temperature thermistor

1-time fl

—

—

ash every

2.5 seconds

—

Overcurrent protection cut-out operates

3 consecutive times within 1 minute after the compressor gets started.

Thermistor shorts or opens during compressor running.

—

• Reconnect connectors.

• Refer to 10-5. "How to check inverter/ compressor".

• Check stop valve.

• Refer to 10-5. "Check of outdoor thermistors".

Defective outdoor thermistors can be identi fi ed by checking the blinking pattern of

LED. P.C. board temperature thermistor



(MUZ-GE24, MUY-GE24)

3-time fl ash

2.5 seconds OFF

4-time

2-time fl

2.5 seconds OFF fl

ash

ash

2.5 seconds OFF

4-time

5-time

6-time

7-time

8-time

9-time fl ash

2.5 seconds

OFF fl ash

2.5 seconds

OFF fl ash

2.5 seconds

OFF fl ash

2.5 seconds

OFF fl ash

2.5 seconds

OFF fl ash

2.5 seconds

OFF

10-time fl ash

2.5 seconds

OFF

Compressor synchronous abnormality (Compressor startup failure protection)


High pressure

Fin temperature/ P.C. board temperature

Outdoor fan motor

Nonvolatile memory data

Power module

(MUZ-GE24, MUY-GE24)


2.5 seconds OFF

12-time fl fl

ash

ash

2.5 seconds OFF

7-time

2.5 seconds OFF

5-time fl fl

—

—

ash

—

ash

2.5 seconds OFF

6-time fl ash

2.5 seconds OFF

—

Large current fl ows into intelligent power module/ power module 1.

Waveform of compressor current is distorted.

Temperature of discharge temperature thermistor exceeds 241°F (116°C), compressor stops.

Compressor can restart if discharge temperature thermistor reads 212°F

(100°C) or less 3 minutes later.

Temperature of indoor coil thermistor exceeds 158°F (70°C) in HEAT mode

(MUZ only).

Temperature of outdoor heat exchanger temperature thermistor exceeds 158°F (70°C) in COOL mode.

Temperature of fi n temperature thermistor on the inverter P.C. board exceeds 167 ~ 176°F (75 ~ 80°C), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158 ~ 167°F (70 ~ 75°C).

Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.

Nonvolatile memory data cannot be read properly.

The interphase short circuit occurs in the output of the intelligent power module (IPM)/power module (IPM) 1.

The compressor winding shorts circuit.

Temperature of discharge temperature thermistor has been 122°F (50°C) or less for 20 minutes.

• Reconnect compressor connector.





• Check refrigerant circuit and refrigerant amount.

• Refer to 10-5. "Check of LEV".



• Check around outdoor unit.

• Check outdoor unit air passage.

• Refer to 10-5. "Check of outdoor fan motor".


Refer to 10-5. "Check of inverter P.C. board".

• Replace the inverter

P.C. board.




Indoor/

Outdoor unit failure mode failure mode recall function recall function

— —

○

○

—

—

—

—

—

—

○

—

○

○

○

○

○

○

○

○

○

○

NOTE

: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).

1

Intelligent power module:

MUZ-GE09/12/15/18/24NA

,

MUY-GE09/12/15/18/24NA

Power module:

Other models

OBH549G

47

3. Outdoor unit failure mode table

OPERATION

INDICATOR upper lamp

(Indoor unit)

11-time fl ash

2.5 seconds

OFF

Abnormal point

(Failure mode / protection)

DC voltage

12-time

OFF fl ash

2.5 seconds

Each phase current of compressor

Overcurrent Compressor openphase

LED indication

(Outdoor P.C. board)

8-time fl ash

2.5 seconds OFF

9-time fl ash

2.5 seconds OFF

10-time fl ash

2.5 seconds OFF

DC voltage of inverter cannot be detected normally.

Each phase current of compressor cannot be detected normally.

Large current fl ows into intelligent power module (IPM)/power module

(IPM) 1.

The open-phase operation of compressor is detected.

The interphase short circuit occurs in the output of the intelligent power module (IPM)/power module (IPM) 1.

The compressor winding shorts circuit.

14-time fl ash

2.5 seconds

OFF

Stop valve (Closed valve) 14-time fl ash

2.5 seconds OFF




Closed valve is detected by compressor current.

• Check stop valve

Indoor/

Outdoor unit failure mode failure mode recall function recall function

—

—

○

○

4-way valve/

Pipe temperature

16-time fl ash

2.5 seconds OFF

The 4-way valve does not work properly.

The indoor coil thermistor detects an abnormal temperature.

• Check the 4-way valve.

• Replace the inverter

P.C. board.

○ ○

NOTE

: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).

1


MUZ-GE09/12/15/18/24NA

,

MUY-GE09/12/15/18/24NA

Power module:

Other models

OBH549G

48

10-3. TROUBLESHOOTING CHECK TABLE

No. Symptom LED indication

1

Outdoor unit does not operate.

1-time fl ash every

2.5 seconds

Abnormal point/

Condition

Outdoor power system

2

3

Condition Remedy

Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started, or failure of restart of compressor has repeated 24 times.

Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor,

P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running.

Outdoor control system

Nonvolatile memory data cannot be read properly.

(The upper lamp of OPERATION INDICATOR of the indoor unit lights up or fl ashes 7 times.)

• Reconnect connector of compressor.




• Replace inverter P.C. board.

4

5

6

6-time fl ash

2.5 seconds OFF

11-time fl ash

2.5 seconds OFF

14-time fl ash

2.5 seconds OFF

Serial signal

Stop valve/

Closed valve

Outdoor unit

(Other abnormality)

The communication fails between the indoor and outdoor unit for

3 minutes.

Closed valve is detected by compressor current.

Outdoor unit is defective.

• Refer to 10-5. "How to check miswiring and serial signal error.


• Refer to 10-2.2. "Flow chart of the detailed outdoor unit failure mode recall function".

7

16-time fl ash

2.5 seconds OFF

4-way valve/

Pipe temperature

The 4-way valve does not work properly.

The indoor coil thermistor detects an abnormal temperature.

• Refer to 10-5. "Check of R.V. coil".

• Replace the inverter P.C. board.

8

9

10

11

12

13

14

15

16

17

18

'Outdoor unit stops and restarts 3 minutes later' is repeated.

2-time fl ash

2.5 seconds OFF

Overcurrent protection

Outdoor unit operates.

Large current

1.

fl ows into intelligent power module/power module

When overcurrent protection occurs within 10 seconds after compressor starts, compressor restarts after 15 seconds

(MUZ-GE09/12/15/18, MUY-GE09/12/15/18)

.




3-time fl ash

2.5 seconds OFF

4-time fl ash

2.5 seconds OFF

5-time fl ash

2.5 seconds OFF

8-time fl ash

2.5 seconds OFF

Discharge temperature overheat protection

Fin temperature /P.C. board temperature thermistor overheat protection

Temperature of fi n temperature thermistor on the heat sink exceeds 167 ~ 176°F (75 ~ 80°C) or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158 ~ 167°F

(70 ~ 75°C).

High pressure protection

Temperature of discharge temperature thermistor exceeds 241°F

(116°C), compressor stops. Compressor can restart if discharge temperature thermistor reads 212°F (100°C) or less 3 minutes later.

Temperature of indoor coil thermistor exceeds 158°F (70°C) in

HEAT mode

(MUZ only)

. Temperature of outdoor heat exchanger temperature thermistor exceeds 158°F (70°C) in COOL mode.



• Check around outdoor unit.

• Check outdoor unit air passage.




Compressor synchronous abnormality

The waveform of compressor current is distorted.



10-time fl ash

2.5 seconds OFF

12-time

2.5 seconds OFF

13-time

2.5 seconds OFF

1-time

2.5 seconds OFF

3-time

2.5 seconds OFF

4-time fl fl fl fl fl

ash

ash

ash

ash

ash

2.5 seconds OFF

Outdoor fan motor

Each phase current of compressor

DC voltage

Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.

• Refer to 10-5. "Check of outdoor fan motor.

• Refer to 10-5. "Check of inverter P.C. board.

Each phase current of compressor cannot be detected normally. • Refer to 10-5. "How to check inverter/ compressor".

DC voltage of inverter cannot be detected normally.


Frequency drop by current protection

Frequency drop by high pressure protection

Frequency drop by defrosting in COOL mode

Current from power outlet is nearing Max. fuse size.

Temperature of indoor coil thermistor exceeds 131°F (55°C) in

HEAT mode, compressor frequency lowers.

Indoor coil thermistor reads 46°F (8°C) or less in COOL mode, compressor frequency lowers.

The unit is normal, but check the following.

• Check if indoor fi lters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short cycled.

Frequency drop by discharge temperature protection

Temperature of discharge temperature thermistor exceeds 232°F

(111°C), compressor frequency lowers.




NOTE

: 1. The location of LED is illustrated at the right fi gure. Refer to 10-6.1.

2. LED is lighted during normal operation. fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF. Flashing

(Example) When the fl ashing frequency is “2”.

Inverter

P.C. board

(Parts side)

LED

MUZ-GE24NA

MUY-GE24NA

0.5-second ON

0.5-second ON

ON

OFF

2.5-second OFF

2.5-second OFF

1


MUZ-GE09/12/15/18/24NA

,

MUY-GE09/12/15/18/24NA

Power module:

Other models

Flashing →

LED

MUZ-GE09/12/15

NA/NA2/NAH/

NAH2

MUY-GE09/12/15

NA/NA2

MUZ-18NA/NAH

MUY-18NA

OBH549G

49

10-3. TROUBLESHOOTING CHECK TABLE

No. Symptom LED indication

19

Outdoor unit operates.

7-time fl ash

2.5 seconds OFF

Abnormal point/

Condition

Low discharge temperature protection

20

21

8-time fl ash

2.5 seconds OFF

PAM protection PAM:

Pulse Amplitude

Modulation

The overcurrent fl ows into IGBT (Insulated Gate Bipolar transistor: TR821) or the bus-bar voltage reaches 320 V or more, PAM stops and restarts.

9-time fl ash

2.5 seconds OFF

Zero cross detecting circuit

Condition Remedy

Temperature of discharge temperature thermistor has been

122°F (50°C) or less for 20 minutes.

Zero cross signal for PAM control cannot be detected.

Inverter check mode The connector of compressor is disconnected, inverter check mode starts.



This is not malfunction. PAM protection will be activated in the following cases:

1 Instantaneous power voltage drop

(Short time power failure)

2 When the power supply voltage is high.

• Check if the connector of the compressor is correctly connected. Refer to

10-5. "How to check inverter/compressor".

NOTE

: 1. The location of LED is illustrated at the right fi gure. Refer to 10-6.1.

2. LED is lighted during normal operation. fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF. Flashing

(Example) When the fl ashing frequency is “2”.

0.5-second ON

0.5-second ON

Inverter

P.C. board

(Parts side)

LED

MUZ-GE24NA

MUY-GE24NA

ON

OFF

2.5-second OFF

2.5-second OFF

Flashing →

LED

MUZ-GE09/12/15

NA/NA2/NAH/

NAH2

MUY-GE09/12/15

NA/NA2

MUZ-18NA/NAH

MUY-18NA

10-4. TROUBLE CRITERION OF MAIN PARTS

MUZ-GE24NA




MUY-GE24NA


Figure Part name Check method and criterion

Defrost thermistor (RT61)

(MUZ)

Fin temperature thermistor (RT64)

Measure the resistance with a tester.

Ambient temperature thermistor (RT65)

Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor.


(RT68)

Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.

Discharge temperature thermistor (RT62)

Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor.

Compressor

Measure the resistance between terminals using a tester.

(Temperature: -4 ~ 104°F (-20 ~ 40°C))

GE09

Normal ( Ω )

GE12 GE15/18

U-V

U-W

V-W

1.36 ~ 1.93

1.52 ~ 2.17

0.78 ~ 1.11

GE24

0.83 ~ 1.18

WHT

V

RED BLK

W

U

OBH549G

50

Part name

Outdoor fan motor

R. V. coil (21S4)

(MUZ)

Expansion valve coil

(LEV)

Defrost heater

MUZ-GE•NAH

Check method and criterion

Measure the resistance between lead wires using a tester.

(Temperature: -4 ~ 104°F (-20 ~ 40°C))

Color of lead wire

GE09/12

Normal ( Ω )

GE15 GE18/24

RED – BLK

BLK – WHT

WHT – RED

28 ~ 40 11 ~ 16

Measure the resistance using a tester.

(Temperature: 14 ~ 104°F (-10 ~ 40°C))

Normal (k Ω )

0.97 ~ 1.38


(Temperature: 14 ~ 104°F (-10 ~ 40°C))

MUZ-GE09/12/15/18NA

MUZ-GE09/12/15NA2

MUZ-GE09/12/15/18NAH

MUZ-GE09/12/15NAH2

MUY-GE09/12/15/18NA

MUY-GE09/12/15NA2

Normal ( Ω ) Color of lead wire

WHT – RED

RED – ORN

YLW – BRN

BRN – BLU

37 ~ 54


(Temperature: 14 ~ 104°F (-10 ~ 40°C))

MUZ-GE24NA, MUY-GE24NA

Normal ( Ω ) Color of lead wire

RED – ORN

RED – WHT

RED – BLU

RED – YLW

37 ~ 54


(Temperature: 14 ~ 104°F (-10 ~ 40°C))

Normal ( Ω )

349 ~ 428

Figure

WHT

RED BLK

W

V

U

WHT

RED

ORN

LEV

WHT

ORN

RED

(+12V)

LEV

OBH549G

51

10-5. TROUBLESHOOTING FLOW

A How to check inverter/compressor

Disconnect the connector between compressor and the intelligent power module (IPM)/power module (IPM) 1.

Check the voltage between terminals.

See 10-5. “Check of open phase”.

Are the voltages balanced?

Yes

Check the compressor.

No

Replace the inverter P.C. board.

See 10-5. “Check of compressor”.

B Check of open phase

● With the connector between the compressor and intelligent power module/power module 1 disconnected, activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals.

Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)

<< Operation method>>

Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA-

TION: Refer to 7-6.)

<<Measurement point>>

at 3 points

BLK (U) - WHT (V)

BLK (U) - RED (W)

WHT(V) - RED (W)

Measure AC voltage between the lead wires at 3 points.

NOTE

: 1. Output voltage varies according to power supply voltage.

2. Measure the voltage by analog type tester.

3. During this check, LED of the inverter P.C. board fl ashes 9 times. (Refer to 10-6.1.)

C Check of compressor

Refer to 10-5. “Check of compressor winding”.

Is the compressor normal?

Yes

No

Replace the compressor.

Refer to 10-5. “Check of compressor operation time”.

Does the compressor operate continuously?

Yes

OK

No

Refer to 10-5. “Check of compressor start failure”.

1


MUZ-GE09/12/15/18/24NA

,

MUY-GE09/12/15/18/24NA

Power module:

Other models

OBH549G

52

D Check of compressor winding

● Disconnect the connector between the compressor and intelligent power module/power module 1, and measure the resistance between the compressor terminals.

<<Measurement point>>

At 3 points

BLK - WHT

BLK - RED

WHT - RED

<<Judgement>>

Measure the resistance between the lead wires at 3 points.

1

Refer to 10-4.

0[ Ω ] ················· Abnormal [short]


Power module:

Infinite [ Ω ] ········ Abnormal [open]

NOTE

: Be sure to zero the ohmmeter before measurement.

MUZ-GE09/12/15/18/24NA

Other models

,

MUY-GE09/12/15/18/24NA

E Check of compressor operation time

● Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current.

<<Operation method>>

Start heating or cooling operation by pressing EMERGENCY

OPERATION switch on the indoor unit.

(TEST RUN OPERATION: Refer to 7-6.)

<<Measurement>>

Measure the time from the start of compressor to the stop of compressor due to overcurrent.

<<Judgement>>

0 second

1 second

2 seconds

10 seconds

Compressor starts

Abnormal

(IPM failure)

(Compressor winding short)

Abnormal

(Compressor lock out)

(Starting defect)

Abnormal

(Poor contact,)

(Inverter P.C. board defect)

(Disconnected connector)

Abnormal

(Refrigerant circuit defect)

(Closed valve)

Normal

10 minutes

F Check of compressor start failure

Con fi rm that 1~4 is normal.

• Electrical circuit check

1. Contact of the compressor connector

2. Output voltage of inverter P.C. board and balance of them (See 10-5. )

3. Direct current voltage between DB61(+) and (-) (

MUZ-GE09/12/1518,

MUY-GE09/12/1518)

/ JP715(+) and JP30(-) (

MUZ-GE24, MUY-GE24)

on the inverter P.C. board

4. Voltage between outdoor terminal block S1-S2

Does the compressor run for 10 seconds or more after it starts?

No

Yes

After the compressor is heated with a drier, does the compressor start? 1

Yes

Compressor start failure. Activate pre-heat control.

(Refer to 9-2. "PRE-HEAT CONTROL SETTING")

No

Check the refrigerant circuit.

Check the stop valve.

Replace the compressor.

1

Heat the compressor with a drier for about 20 minutes.

Do not recover refrigerant gas while heating.

Heating part

OBH549G

53

G Check of outdoor thermistors

Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor.

Is the resistance of thermistor normal? (Refer to 10-6.1.)

Yes

No

Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board.

Reconnect the connector of thermistor.

Turn ON the power supply and press EMERGENCY OPERATION switch.

Does the unit operate for 10 minutes or more without showing thermistor abnormality?

Yes

OK (Cause is poor contact.)

No


MUZ-GE09/12/15NA/NA2/NAH/NAH2, MUZ-GE18NA/NAH, MUY-GE09/12/15NA/NA2, MUY-GE18NA

Thermistor

Defrost

(MUZ)


Symbol Connector, Pin No.

RT61 Between CN641 pin1 and pin2


Fin temperature

Ambient temperature

RT64

RT65

Between CN642 pin1 and pin2


Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3

Board

Inverter P.C. board

MUZ-GE24NA, MUY-GE24NA

Thermistor

Defrost

(MUZ)


Symbol Connector, Pin No.



Fin temperature

Ambient temperature

RT64

RT65



Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6

Board

Inverter P.C. board

H Check of R.V. coil

MUZ-GE09/12/15NA/NA2/NAH/NAH2, MUZ-GE18NA/NAH, MUZ-GE24NA

First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4.

In case CN721 (

MUZ-GE09/12/15/18

)/CN602 (

MUZ-GE24

) is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil. Check if CN721 (

MUZ-

GE09/12/15/18

)/CN602 (

MUZ-GE24

) is connected.

Unit operates COOL mode even if it is set to HEAT mode.

Disconnect connector between the compressor and intelligent power module/ power module 1.

Turn ON the power supply and press

EMERGENCY OPERATION switch twice

(HEAT mode).

Is there 208/230 VAC between CN721 (

MUZ-

GE09/12/15/18

)/CN602 (

MUZ-GE24

) and on the inverter P.C. board 3 minutes after the power supply is turned ON?

Yes

Replace the 4-way valve.

No

Replace the inverter

P.C. board.

1


MUZ-GE09/12/15/18/24NA

,

MUY-GE09/12/15/18/24NA

Power module:

Other models

OBH549G

54

Unit operates HEAT mode even if it is set to COOL mode.

Disconnect connector between the compressor and intelligent power module/ power module 1.

Turn ON the power supply and press

EMERGENCY OPERATION switch once (COOL mode).

Is there 230 VAC between CN721 (

MUZ-

GE09/12/15/18

)/CN602 (

MUZ-GE24

) and

on the inverter P.C. board 3 minutes after the power supply is turned ON?

No

Yes


P.C. board.

Replace the 4-way valve.

1


MUZ-GE09/12/15/18/24NA

,

MUY-GE09/12/15/18/24NA

Power module:

Other models

I Check of outdoor fan motor

Disconnect the connectors CN931 and CN932 from the inverter P.C. board.Check the connection between the connector CN931 and CN932.

Is the resistance between each terminal of outdoor fan motor normal?

(Refer to 10-4.)

No

Yes

Disconnect CN932 from the inverter P.C. board, and turn on the power supply.

Rotate the outdoor fan motor manually and measure the voltage of CN931.

Between 1(+) and 5(-)



(Fixed to either 5 or 0 VDC)

No

Replace the outdoor fan motor.

No

Does the voltage between each terminal become 5 and 0

VDC repeatedly?

Yes

Does the outdoor fan motor rotate smoothly?

Yes


OBH549G

55

J Check of power supply

MUZ-GE09/12/15NA/NA2/NAH/NAH2 MUZ-GE18NA/NAH

MUY-GE09/12/15NA/NA2 MUY-GE18NA

1


MUZ-GE09/12/15/18/24NA

,

MUY-GE09/12/15/18/24NA

Power module:

Other models

Disconnect the connector (CN61) between compressor and intelligent power module/ power module 1.

Turn ON power supply and press

EMERGENCY OPERATION switch.

Does The upper lamp of

OPERATION INDICATOR lamp on the indoor unit light up?

Yes

No

Is there bus-bar voltage 260-325

VDC between DB61 (+) and DB61 (–) on the inverter P.C. board?

(Refer to 10-6.1.)

No

Yes

Check the electric parts in main circuit.

Rectify indoor/outdoor connecting wire.

Yes

Is there voltage 208/230 VAC between the indoor terminal block S1 and S2?

Does LED on the inverter P.C. board light up or fl ash? (Refer to 10-6.1.)

Yes

No


P.C. board.

If LED lights up, it is OK.

If LED fl ashes, refer to 10-3.

No

Replace the indoor electronic control P.C. board.

260-325 VDC

DB61

MUZ-GE24NA

MUY-GE24NA

Inverter P.C. board

(Solder side) Disconnect the connector between compressor and intelligent power module/ power module 1.

Turn ON power supply and press

EMERGENCY OPERATION switch.

Does the upper lamp of

OPERATION INDICATOR on the indoor unit light up?

Yes

No

Is there bus-bar voltage 294 - 370

VDC between JP715 (+) and JP30 (–) on the inverter P.C. board?

(Refer to 10-6.1.)

No

Yes

Rectify indoor/outdoor connecting wire.

Yes

Is there voltage 208/230 VAC between the indoor terminal block S1 and S2?

No


Does LED on the inverter P.C. board light up or fl ash? (Refer to 10-6.1.)

Yes

No


P.C. board.

Check the electric parts in main circuit.

If LED lights up, it is OK.

If LED fl ashes, refer to 10-3.

JP30 JP715

OBH549G

294 -370 VDC

56

K Check of LEV (Expansion valve)


<Preparation of the remote controller>

While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.

First, release RESET button.

Hold down the other two buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right fi gure are all displayed.

Then release the buttons.

MSZ-GE06/09/12/15/18NA

MSY-GE09/12/15/18NA

MSZ-GE24NA

MSY-GE24NA

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1

Expansion valve operates in full-opening direction.

1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Do you hear the expansion valve "click, click·······"?

Do you feel the expansion valve vibrate on touching it ?

No

Is LEV coil properly fi xed to the expansion valve?

Yes

No

Yes

Properly fi

OK

x the LEV coil to the expansion valve.

Does the resistance of LEV coil have the characteristics?

(Refer to 10-4.)

No

Replace the LEV coil.

Yes

Measure each voltage between connector pins of CN724 on the inverter P.C. board.

1. Pin (-) — Pin (+)

2. Pin (-) — Pin (+)

3. Pin (-) — Pin (+)

4. Pin (-) — Pin (+)

Is there about 3 ~ 5 VAC between each?

NOTE

: Measure the voltage by an analog tester.

Yes

Replace the expansion valve.

No


NOTE

: After check of LEV, do the undermentioned operations.

1. Turn OFF the power supply and turn ON it again.

2. Press RESET button on the remote controller.

OBH549G

57

L Check of inverter P.C. board

Check the outdoor fan motor.

(Refer to 10-5. .)

Is the fuse (F901) blown on the inverter P.C. board?

No

Yes

Check the connection of the connectors

(CN931 , CN932) of the outdoor fan motor.

If the connection is poor, make it correct.

Only for


Operate the outdoor unit by starting

EMERGENCY OPERATION.

Check the LED indication on the inverter P.C. board.

Does the LED fl ash 10 times?

Yes

(10-time fl ash)

No

Check the remedy following LED indication.

(Refer to 10-3.)


OBH549G

58

M How to check miswiring and serial signal error

Turn OFF the power supply.

Is there rated voltage in the power supply?

Yes


No

Check the power supply.

Is there rated voltage between outdoor terminal block S1 and S2?

Yes

Press EMERGENCY OPERATION switch once.

No

Check the wiring.

Does the OPERATION INDICATOR lamp light up? <Con fi rmation of the power to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

Yes

No

No

Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire?

No

Yes

Correct them.

A

B


Check once more if the indoor/outdoor connecting wire is not miswiring.

Bridge the outdoor terminal block S2 and

S3. 1

1. Miswiring may damage indoor electronic control P.C. board during the operation.

Be sure to con fi rm the wiring is correct before the operation starts.

3. Be sure to check this within 3 minutes after turning ON.

After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes.


Is the bus-bar voltage of the inverter P.C. board normal? (Refer to "TEST POINT DIAGRAM AND

VOLTAGE" in this manual.)

Yes

Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3

Yes


Remove the bridge between outdoor terminal block S2 and S3.

No

(Lighted or not lighted)

No

Check of power supply.

(Refer to 10-5. .)

Replace the inverter P.C. board . 2

2. Be careful of the residual voltage of smoothing capacitor.


A

• Turn OFF inverter-controlled lighting equipment.

• Turn OFF the power supply and then turn ON again.

• Press EMERGENCY OPERATION switch.

Is serial signal error indicated 6 minutes later?

Yes

No

B

• Reinstall either the unit or the light away from each other.

• Attach a fi lter on remote control receiving section of the indoor unit.

OBH549G

59

N Electromagnetic noise enters into TV sets or radios

Is the unit grounded?

Yes

No

Ground the unit.

Is the distance between the antennas and the indoor unit within 9.91 ft., or is the distance between the antennas and the outdoor unit within 9.91 ft.?

No

Yes

Is the distance between the TV sets or radios and the indoor unit within 3.28 ft., or is the distance between the TV sets or radios and the outdoor unit within 9.91 ft.?

No

Yes

Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.

Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.

Are the antennas damaged?

Is the coaxial cable damaged?

Is there any poor contact in the antenna wiring?

No

Yes

Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close?

No

Yes

Replace or repair the antenna.

Replace or repair the coaxial cable.

Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas.

Even if all of the above conditions are ful fi lled, the electromagnetic noise may enter, depending on the electric fi eld strength or the installation condition (combination of speci fi c conditions such as antennas or wiring).

Check the followings before asking for service.

1. Devices affected by the electromagnetic noise

TV sets, radios (FM/AM broadcast, shortwave)

2. Channel, frequency, broadcast station affected by the electromagnetic noise

3. Channel, frequency, broadcast station unaffected by the electromagnetic noise

4. Layout of:

indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver

5. Electric fi eld intensity of the broadcast station affected by the electromagnetic noise

6. Presence or absence of ampli fi er such as booster

7. Operation condition of air conditioner when the electromagnetic noise enters in

1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise.

2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise.

3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise.

4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.

OBH549G

60

10-6. TEST POINT DIAGRAM AND VOLTAGE

1. Inverter P.C. board







Back side of unit

Bus-bar voltage

DB61

260-325 VDC

Smoothing capacitor

(C63)

Smoothing capacitor

(C62)

208/230 VAC

(-)

(+)

Fuse (F801)

T3.15AL250V

Fuse (F901)

T3.15AL250V

Output to drive compressor

(LDU,

LDV,

LDW)

Smoothing capacitor

(C61)

Fuse (F701)

T3.15AL250V

Heater connector

(CN722)

MUZ-GE•NAH/NAH2

R.V.coil

(CN721)

208/230

VAC

(MUZ)

Signal of outdoor fan motor

(CN931)

208/230

VAC

Front side of unit

Output to drive outdoor fan motor (CN932)

Fin temperature thermistor/RT64 (CN642)


/RT68 (CN644)

LED

Discharge temperature thermistor/RT62

(CN641)

Defrost thermistor

/RT61(CN641)

(MUZ)

Ambient temperature thermistor/RT65 (CN643)

LEV connector

(CN724)

100

Defrost thermistor(RT61)

Ambient temperature thermistor(RT65)

Outdoor heat exchanger temperature thermistor(RT68)

Jumper wire for changing defrost setting (JS)

(MUZ)

Jumper wire for pre-heat control setting

(JK)

200

Fin temperature thermistor(RT64)

90

180

80

160

70

60

50

40

30

20

10

0

-4 14 32 50 68 86 104

Temperature(°F)

OBH549G

400

300

200

100

800

Discharge temperature thermistor (RT62)

700

600

500

0

32 60 68 86 104 122 140 158 176 194 212 230 248

Temperature (°F)

61

140

120

100

80

60

40

20

0

32 50 68 86 104 122 140 158 176


MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA

Back side of unit

208/230 VAC

Bus-bar voltage

DB61

260-325 VDC

(-)

(+)

Smoothing capacitor

(C63)

Smoothing capacitor

(C62)

Fuse (F801)

T3.15AL250V

Smoothing capacitor

(C61)

Fuse (F701)

T3.15AL250V

R.V.coil

(CN721)

208/230

VAC

(MUZ)

Heater connector

(CN722)

MUZ-GE•

NAH

Fuse (F901)

T3.15AL250V

Output to drive compressor

(LDU,

LDV,

LDW)

208/230

VAC

Front side of unit

Fin temperature thermistor /R

Outdoor heat exchanger temperature thermistor /R

Ambient temperature thermistor /R Defrost thermistor /R

Discharge temperature thermistor /R

Output to drive outdoor fan motor (CN932)

Signal of outdoor fan motor (CN931)

80

70

60

50

40

30

20

10

100




90

0

-4 14 32 50 68 86 104


OBH549G

800

700

600

500

400

300

200

100


0

32 60 68 86 104 122 140 158 176 194 212 230 248


62

200


180

160

140

120

100

80

60

40

20

0

32 50 68 86 104 122 140 158 176


MUZ-GE24NA

MUY-GE24NA

Fuse (F62)

T2.0AL250V

Fuse (F601)

T3.15AL250V (

MUZ

)

R.V. coil (CN602)

208/230 VAC (

MUZ

)

Signal of outdoor fan motor

(CN931)

LED

Output to drive outdoor fan motor

(CN932)

Fuse (F901)

T3.15AL250V

Fuse (F880)

T3.15AL250V

Jumper wire for changing defrost setting (JS) (

MUZ

)

Jumper wire for pre-heat control setting (JK)

Defrost thermistor

/RT61 (CN671) (

MUZ

)

Discharge temperature thermistor/RT62

(CN671)


/RT68 (CN671)

Ambient temperature thermistor/RT65

(CN672)

Fin temperature thermistor/RT64

(CN673)

LEV connector (CN724)

80

70

60

50

40

30

20

10

100




90

0

-4 14 32 50 68 86 104


OBH549G

800

700

600

500

400

300

200

100

63

JP715 (+)

Bus-bar voltage

294 - 370 VDC

JP30 (-)


0

32 60 68 86 104 122 140 158 176 194 212 230 248


200

180

160

140

120

100

80

60


40

20

0

32 50 68 86 104 122 140 158 176


11

DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

The terminal which has the locking mechanism can be detached as shown below.

There are two types (refer to (1) and (2)) of the terminal with locking mechanism.

The terminal without locking mechanism can be detached by pulling it out.

Check the shape of the terminal before detaching.

(1) Slide the sleeve and check if there is a locking lever or not.

(2) The terminal with this connector has the

locking mechanism.

Sleeve

Locking lever

Slide the sleeve.

Pull the terminal while pushing the locking lever.

Connector

11-1. MUZ-GE09NA MUZ-GE12NA

MUZ-GE09NA2

MUZ-GE15NA

MUZ-GE12NA2

MUZ-GE09NAH

MUZ-GE09NAH2

MUZ-GE15NA2

MUZ-GE15NAH

MUZ-GE15NAH2


Hold the sleeve, and pull out the terminal slowly.

OPERATING PROCEDURE

1. Removing the cabinet

(1) Remove the screw fixing the service panel.

(2) Pull down the service panel and remove it.

(3) Remove the screws fixing the conduit cover.

(4) Remove the conduit cover.

(5) Disconnect the power supply wire and indoor/outdoor connecting wire.

(6) Remove the screws fixing the top panel.

(7) Remove the top panel.

(8) Remove the screws fixing the cabinet.

(9) Remove the cabinet.

(10) Remove the screws fixing the back panel.

(11) Remove the back panel.

NOTE

: Turn OFF power supply before disassembly.

PHOTOS

Photo 1

Screws of the top panel


Back panel

Screws of the back panel

Photo 2

Screw of the cabinet

Screws of the terminal block support and the back panel

Screws of the cabinet

Photo 3

Service panel

Screw of the service panel

Screws of the conduit cover

Direction to remove

Conduit cover

Conduit plate


OBH549G

Hooks

64


2. Removing the inverter assembly, inverter P.C. board

(1) Remove the cabinet and panels. (Refer to 1.)

(2) Disconnect the lead wire to the reactor and the following connectors:

<Inverter P.C. board>

CN641 (Defrost thermistor

(MUZ)

and discharge temperature thermistor)

CN643 (Ambient temperature thermistor)

CN644 (Outdoor heat exchanger temperature thermistor)

CN721 (R.V. coil)

(MUZ)

CN724 (LEV)

CN931, CN932 (Fan motor)

(3) Remove the compressor connector (CN61).

(4) Remove the screws fixing the heat sink support and the separator.

(5) Remove the fixing screws of the terminal block support and the back panel.

(6) Remove the inverter assembly.

(7) Remove the screw of the ground wire and screw of the terminal block support.

(8) Remove the heat sink support from the P.C. board support.

(9) Remove the screw of the inverter P.C. board and remove the inverter P.C. board from the P.C. board support.

Photo 4

PHOTOS

Screw of the heat sink support and the separator

Photo 5 (Inverter assembly)

Heat sink

Inverter P.C. board

Hook of the

P.C. board support

P.C. board support


Screw of the terminal block support

3. Removing R.V. coil

(MUZ)


(2) Disconnect the following connectors:


CN721 (R.V. coil)

(3) Remove the R.V. coil.

Terminal block support

Heat sink support

Hook of the P.C. board support

Screw of the P.C. board fixture

Screw of the ground wire

Photo 6

R.V. coil

(MUZ)

OBH549G

65



4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor





(MUZ)




(3) Pull out the discharge temperature thermistor from its holder.

(Photo 6)

(4) Pull out the defrost thermistor from its holder.

(5) Pull out the outdoor heat exchanger temperature thermistor from its holder.

(6) Pull out the ambient temperature thermistor from its holder.

Photo 7

PHOTOS


Defrost thermistor

(MUZ)

Photo 8

Screws of the outdoor fan motor

5. Removing outdoor fan motor





(3) Remove the propeller nut.

(4) Remove the propeller.

(5) Remove the screws fixing the fan motor.

(6) Remove the fan motor.

6. Removing the compressor and 4-way valve


(2) Remove the inverter assembly. (Refer to 2.)

(3) Recover gas from the refrigerant circuit.

NOTE:

Recover gas from the pipes until the pressure gauge shows 0 PSIG.

(4) Detach the brazed part of the suction and the discharge pipes connected with compressor.

(5) Remove the compressor nuts.

(6) Remove the compressor.

(7) Detach the brazed part of the pipes connected with 4-way valve.

Propeller

Photo 9

Propeller nut

Brazed parts of 4-way valve

OBH549G

66

11-2. MUZ-GE18NA

MUZ-GE18NAH

MUY-GE18NA



(1) Remove the screws of the service panel.

(2) Remove the screws of the top panel.

(3) Remove the screw of the valve cover.

(4) Remove the service panel.


(6) Remove the valve cover.

(7) Disconnect the power supply and indoor/outdoor connecting wire.

(8) Remove the screws of the cabinet.


(10) Remove the screws of the back panel.


NOTE:

Turn OFF power supply before disassembly.

PHOTOS

Photo 1

Screw of the top panel Screws of the cabinet



Photo 2


OBH549G

67


Screw of the service panel

Screw of the valve cover


OPERATING PROCEDURE PHOTOS






(MUZ)




CN721 (R.V.coil)

(MUZ)

CN724 (LEV)


(3) Remove the compressor connector (CN61).

(4) Remove the screws fixing the heat sink support and the separator.

(5) Remove the fixing screws of the terminal block support and the back panel.

(6) Remove the inverter assembly.

(7) Remove the screw of the ground wire and screw of the terminal block support.

(8) Remove the heat sink support from the P.C. board support.

(9) Remove the screw of the inverter P.C. board and remove the inverter P.C. board from the P.C. board support.

Photo 3

Screw of the heat sink support and the separator

Photo 4 (Inverter assembly)


Screws of the reactor

Heat sink

Inverter P.C. board


P.C. board support

Screw of the terminal block support





CN721 (R.V. coil)

(MUZ)


Heat sink support


Screw of the ground wire

Screw of the P.C. board fixture

Terminal block support

Photo 5

R.V. coil

(MUZ)

OBH549G

68

Brazed parts of 4-way valve







(MUZ)








PHOTOS

Photo 6




(1) Remove the top panel, cabinet and service panel. (Refer to 1.)



CN931 and CN932 (Fan motor)




Photo 7


Defrost thermistor

(MUZ)



(2) Remove the back panel. (Refer to 1.)



NOTE:





(8) Detach the brazed parts of 4-way valve and pipes. (Photo 5)

Photo 8

Brazed part of the discharge pipe


Brazed part of the suction pipe

OBH549G

69

11-3. MUZ-GE24NA

MUY-GE24NA



(1) Remove the screws of the service panel.

(2) Remove the screws of the top panel.

(3) Remove the screw of the valve cover.

(4) Remove the service panel.

(5) Remove the screws fixing the conduit cover.

(6) Remove the conduit cover.


(8) Remove the valve cover.

(9) Disconnect the power supply and indoor/outdoor connecting wire.

(10) Remove the screws of the cabinet.


(12) Remove the screws of the back panel.


Photo 2




NOTE

: Turn OFF power supply before disassembly.

PHOTOS

Photo 1





Photo 3

Screws of the conduit cover

Conduit plate




Screws of the service panel

Screw of the valve cover

OBH549G

70






CN602 (R.V. coil)

(MUZ)


(MUZ)

, discharge temperature thermistor and outdoor heat exchanger temperature thermistor)


CN724 (LEV)


(3) Remove the compressor connector.

(4) Remove the screws fixing the relay panel.

(5) Remove the relay panel.

(6) Remove the ground wires and the lead wires of the inverter

P.C. board.

(7) Remove the screw of the PB support.

(8) Remove the inverter P.C. board from the relay panel.

Photo 4

Inverter P.C. board

Screws of the PB support

PHOTOS

Screw of the relay panel

Ground wires

Screws of the

PB support



(2) Disconnect the following connector:


CN602 (R.V. coil)

(MUZ)


Photo 5

Screws of the relay panel

Screw of the

R.V. coil

(MUZ)

Brazed parts of

4-way valve

OBH549G

71







(MUZ)

, discharge temperature thermistor and outdoor heart exchanger temperature thermistor)






PHOTOS

Photo 6







CN931 and CN932 (Fan motor)




Photo 7

Defrost thermistor

(MUZ)



(2) Remove the back panel. (Refer to 1.)



NOTE:





(8) Detach the brazed parts of 4-way valve and pipes. (Photo 5)


Photo 8

Brazed part of the discharge pipe


Brazed part of the suction pipe

OBH549G

72

OBH549G

73

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

© Copyright 2009 MITSUBISHI ELECTRIC CORPORATION

Distributed in Jan. 2015. No. OBH 549 REVISED EDITION-G

Distributed in Dec. 2013. No. OBH 549 REVISED EDITION-F

Distributed in Apr. 2012. No. OBH 549 REVISED EDITION-E

Distributed in Apr. 2011. No. OBH 549 REVISED EDITION-D

Distributed in Apr. 2011. No. OBH 549 REVISED EDITION-C

Distributed in Dec. 2010. No. OBH 549 REVISED EDITION-B

Distributed in Sep. 2010. No. OBH 549 REVISED EDITION-A 5

Distributed in Jul. 2009. No. OBH 549 5

Made in Japan

New publication, effective Jan. 2015

Specifications are subject to change without notice.

Mitsubishi Electric Mr. Slim MUZ-GE18NA-1 Service manual

OUTDOOR UNIT

SERVICE MANUAL

No. OBH549

Models

-

-

TM

Use the speci

ed refrigerant only

1

TECHNICAL CHANGES

2

PART NAMES AND FUNCTIONS

3

SPECIFICATION

Test condition

(1) POWER SUPPLY

(2) OPERATION

4

OUTLINES AND DIMENSIONS

5

WIRING DIAGRAM

6

REFRIGERANT SYSTEM DIAGRAM

7 DATA

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.

8

ACTUATOR CONTROL

9

SERVICE FUNCTIONS

10

TROUBLESHOOTING

11

DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

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