Mitsubishi Electric MXZ-2D33VA-E1, MXZ-2D40VA-E1, MXZ-3D68VA-E1, MXZ-2D53VA-E1, MXZ-4D72VA- E1 Service Manual

SERVICE MANUAL

CONTENTS

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

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

3. SPECIFICATION ················································5

4. NOISE CRITERIA CURVES ····························13

5. OUTLINES AND DIMENSIONS ······················16

6. WIRING DIAGRAM ··········································20

7. REFRIGERANT SYSTEM DIAGRAM ·············27

8. PERFORMANCE CURVES ·····························34

9. ACTUATOR CONTROL ···································62

10. SERVICE FUNCTIONS ····································63

11. TROUBLESHOOTING ·····································67

12. DISASSEMBLY INSTRUCTIONS ····················97

INDOOR UNITS COMBINATION SHEETS

Models

No. OBH626

REVISED EDITION-B

HFC

utilized

R410A

SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

Indoor unit service manual
MSZ-EF•VE Series (OBH589)
MSZ-SF•VA Series (OBH555)
MSZ-SF•VE Series (OBH600)
MSZ-FH•VE Series (OBH623)
MFZ-KA•VA Series (OB409)
MLZ-KA•VA Series (OBH483)
SLZ-KA•VA Series (OC320)
SEZ-KD•VA Series (HWE07110)
PLA-RP•BA Series (OCH412)
PCA-RP•KA Series (OCH454)
PEAD-RP•JA Series (HWE08130)

NOTE:

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

PARTS CATALOG (OBB626)

MXZ-2D33VA

-

E1

MXZ-2D40VA

-

E1

MXZ-2D53VA

-

E1

MXZ-2D53VAH

-

E1

MXZ-3D54VA

-

E1

MXZ-3D68VA

-

E1

MXZ-4D72VA

-

E1

MXZ-4D83VA

-

E1

MXZ-5D102VA

-

E1

MXZ-2D33VA
MXZ-2D40VA
MXZ-2D53VA MXZ-2D53VAH

Please void OBH626 REVISED EDITION-A.

Revision B:

• INDOOR UNITS COMBINATION SHEETS for
MXZ-3D54VA, MXZ-3D68VA, MXZ-4D72VA,
MXZ-4D83VA and MXZ-5D102VA have been added.

•

11-4. TROUBLESHOOTING CHECK TABLE (MXZ-

2D) has been modified.

2

<Preparation before the repair service>

Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and remove the power plug.
Discharge the capacitor before the work involving the electric parts.

<Precautions during the repair service>

Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to

touch the live parts.

Use the specif 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:

• MXZ-3D54VA- E1, MXZ-3D68VA- E1, MXZ-4D72VA- E1, MXZ-4D83VA- E1 and MXZ-5D102VA- E1 have been added.

Revision B:

• INDOOR UNITS COMBINATION SHEETS for MXZ-3D54VA, MXZ-3D68VA, MXZ-4D72VA, MXZ-4D83VA and MXZ-5D102VA
have been added.

• 11-4. TROUBLESHOOTING CHECK TABLE (MXZ-2D) has been modified.

OBH626B

3

TECHNICAL CHANGES

1

MXZ-2C30VA -

E1

MXZ-2D33VA -

E1

1. Grill has been changed.

2. Ice guard has been added.

3. Electrical parts have been changed.

4. Fan motor has been changed.

5. Indoor units combinations have been added.

6. Compressor has been changed. (KNB073FGDHC KNB073FFDHC)

MXZ-2C40VA -

E1

MXZ-2D40VA -

E1

MXZ-2C52VA -

E1

MXZ-2D53VA -

E1

1. Grill has been changed.

2. Ice guard has been added.

3. Electrical parts have been changed.

4. Fan motor has been changed.

5. Indoor units combinations have been added.

MXZ-2C52VA -

E1

MXZ-2D53VAH -

E1

1. Grill has been changed.

2. Ice guard has been added.

3. Electrical parts have been changed.

4. Fan motor has been changed.

5. Indoor units combinations have been added.

6. Base heater has been added.

7. Drain socket has been removed.

MXZ-3C54VA -

E1

MXZ-3D54VA -

E1

MXZ-3C68VA -

E1

MXZ-3D68VA -

E1

MXZ-4C71VA -

E1

MXZ-4D72VA -

E1

1. Grill has been changed.

2. Ice guard has been added.

3. Power board has been changed.

4. Electrical control P.C. board has been changed.

5. Noise filter P.C. board has been changed.

6. Fan motor has been changed.

7. Indoor units combinations have been added (MSZ-FH Series).

MXZ-4C80VA2 -

E1

MXZ-4D83VA -

E1

MXZ-5C100VA2 -

E1

MXZ-5D102VA -

E1

1. Indoor units combinations have been added (MSZ-FH Series).

OBH626B

4

PART NAMES AND FUNCTIONS

2

ACCESSORIES

MXZ-2D33VA
MXZ-2D40VA
MXZ-2D53VA
MXZ-2D53VAH

Air inlet

Air outlet

Drain outlet

Piping

Drain hose

(Back and side)

Model

MXZ-2D33VA
MXZ-2D40VA
MXZ-2D53VA
MXZ-4D83VA
MXZ-5D102VA

MXZ-3D54VA
MXZ-3D68VA
MXZ-4D72VA

Drain socket 1 1
Drain cap 2

Air outlet

Drain outlet

Air inlet

(Back and side)

MXZ-3D54VA
MXZ-3D68VA
MXZ-4D72VA

MXZ-4D83VA
MXZ-5D102VA

Air outlet

Drain outlet

Air inlet

(Back and side)

OBH626B

5

SPECIFICATION

3

Outdoor model MXZ-2D33VA

Outdoor unit power supply

Single phase
230 V, 50 Hz

System

Indoor units number 1 to 2

Piping total length m Max. 20

Connecting pipe length m Max. 15

Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

2 kW 3.3 (1.1 - 3.8) 4.0 (1.0 - 4.1)

Breaker capacity A 15

Electrical

data

Power input (Total) 1, 2 W 900 960

Running current (Total)

1, 2 A 4.3 4.6

Power factor (Total)

1, 2% 90

Starting current (Total)

1, 2 A 4.6

Coeff cient of performance (C.O.P) (Total)

1, 2 3.67 4.17

Compressor

Model KNB073FFDHC

Output W 800

Current

1, 2 A 4.0 4.2

Refrigeration oil (Model) L 0.32 (NEO22)

Fan

motor

Model RC0J50-FA

Current

1, 2 A 0.35

Dimensions W x H x D mm 800 x 550 x 285

Weight kg 32

Special

remarks

Air f ow (Rated) m3 /h 1,974 2,022

Sound level (Rated) dB(A) 49 50

Fan speed (Rated) rpm 860 880

Refrigerant f lling capacity (R410A) kg 1.15

1 Measured under rated operating frequency.

2 When connected with below indoor units.
MSZ-SF15VA + MSZ-EF18VE
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

OBH626B

6

Outdoor model MXZ-2D40VA

Outdoor unit power supply

Single phase
230 V, 50 Hz

System

Indoor units number 1 to 2

Piping total length m Max. 30

Connecting pipe length m Max. 20

Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

2 kW 4.0 (1.1 - 4.3) 4.5 (1.0 - 4.8)

Breaker capacity A 15

Electrical

data

Power input (Total) 1, 2 W 970

Running current (Total)

1, 2 A 4.7

Power factor (Total)

1, 2% 90

Starting current (Total)

1, 2 A 4.7

Coeff cient of performance (C.O.P) (Total)

1, 2 4.12 4.64

Compressor

Model KNB092FFDHC

Output W 1,100

Current

1, 2 A 4.4 4.2

Refrigeration oil (Model) L 0.32 (NEO22)

Fan

motor

Model RC0J50-FA

Current

1, 2 A 0.35

Dimensions W x H x D mm 800 x 550 x 285

Weight kg 34

Special

remarks

Air f ow (Rated) m3 /h 1,752 1,662

Sound level (Rated) dB(A) 49 50

Fan speed (Rated) rpm 840 800

Refrigerant f lling capacity (R410A) kg 1.3

1 Measured under rated operating frequency.

2 When connected with below indoor units.
MSZ-EF18VE + MSZ-EF22VE
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

OBH626B

7

Outdoor model MXZ-2D53VA MXZ-2D53VAH

Outdoor unit power supply

Single phase
230 V, 50 Hz

System

Indoor units number 1 to 2

Piping total length m Max. 30

Connecting pipe length m Max. 20

Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

2 kW 5.3 (1.1 - 5.6) 6.4 (1.0 - 7.0)

Breaker capacity A 15

Electrical

data

Power input (Total) 1, 2 W 1,540 1,700

Running current (Total)

1, 2 A 6.9 7.6

Power factor (Total)

1, 2% 97

Starting current (Total)

1, 2 A 7.6

Coeff cient of performance (C.O.P) (Total)

1, 2 3.44 3.76

Compressor

Model SNB130FGBHT

Output W 1,400

Current

1, 2 A 6.6 7.2

Refrigeration oil (Model) L 0.45 (NEO22)

Fan

motor

Model RC0J50-FA

Current

1, 2 A 0.35

Dimensions W x H x D mm 800 x 550 x 285

Weight kg MXZ-2D53VA: 37 MXZ-2D53VAH: 38

Special

remarks

Air f ow (Rated) m3 /h 1,974 1,998

Sound level (Rated) dB(A) 50 53

Fan speed (Rated) rpm 900 910

Refrigerant f lling capacity (R410A) kg 1.3

1 Measured under rated operating frequency.

2 When connected with below indoor units.
MSZ-EF18VE + MSZ-EF35VE
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

OBH626B

8

Outdoor model MXZ-3D54VA

Outdoor unit power supply

Single phase
230 V, 50 Hz

System

Indoor units number 1 to 3

Piping total length m Max. 50

Connecting pipe length m Max. 25

Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

2 kW 5.4 (2.9 - 6.8) 7.0 (2.6 - 9.0)

Breaker capacity A 25

Electrical

data

Power input (Total) 1, 2 W 1,390 1,590

Running current (Total)

1, 2 A 6.1 7.0

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 7.0

Coeff cient of performance (C.O.P) (Total)

1, 2 3.88 4.40

Compressor

Model SNB130FGBH1T

Output W 1,400

Current

1, 2 A 5.72 6.62

Refrigeration oil (Model) L 0.7 (NEO22)

Fan

motor

Model SIC-71FW-F764-1

Current

1, 2 A 0.2

Dimensions W x H x D mm 840 x 710 x 330

Weight kg 57

Special

remarks

Air f ow (Rated) m3 /h 2,334 2,376

Sound level (Rated) dB(A) 50 53

Fan speed (Rated) rpm 650 660

Refrigerant f lling capacity (R410A) kg 2.7

1 Measured under rated operating frequency.

2 When connected with below indoor units.
MSZ-EF18VE + MSZ-EF18VE + MSZ-EF18VE
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

OBH626B

9

Outdoor model MXZ-3D68VA

Outdoor unit power supply

Single phase
230 V, 50 Hz

System

Indoor units number 1 to 3

Piping total length m Max. 60

Connecting pipe length m Max. 25

Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

2 kW 6.8 (2.9 - 8.4) 8.6 (2.6 - 10.6)

Breaker capacity A 25

Electrical

data

Power input (Total) 1, 2 W 2,190 2,380

Running current (Total)

1, 2 A 9.6 10.5

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 10.5

Coeff cient of performance (C.O.P) (Total)

1, 2 3.11 3.61

Compressor

Model SNB172FEGH1T

Output W 1,800

Current

1, 2 A 9.22 10.12

Refrigeration oil (Model) L 0.7 (NEO22)

Fan

motor

Model SIC-71FW-F764-1

Current

1, 2 A 0.2

Dimensions W x H x D mm 840 x 710 x 330

Weight kg 57

Special

remarks

Air f ow (Rated) m3 /h 2,334 2,376

Sound level (Rated) dB(A) 50 53

Fan speed (Rated) rpm 650 660

Refrigerant f lling capacity (R410A) kg 2.7

1 Measured under rated operating frequency.

2 When connected with below indoor units.
MSZ-EF18VE + MSZ-EF25VE + MSZ-EF25VE
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

OBH626B

10

Outdoor model MXZ-4D72VA

Outdoor unit power supply

Single phase
230 V, 50 Hz

System

Indoor units number 1 to 4

Piping total length m Max. 60

Connecting pipe length m Max. 25

Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

2 kW 7.2 (3.7 - 8.8) 8.6 (3.4 - 10.7)

Breaker capacity A 25

Electrical

data

Power input (Total) 1, 2 W 2,250 2,280

Running current (Total)

1, 2 A 9.9 10.0

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 10.0

Coeff cient of performance (C.O.P) (Total)

1, 2 3.20 3.77

Compressor

Model SNB172FEGH1T

Output W 2,000

Current

1, 2 A 9.46 9.56

Refrigeration oil (Model) L 0.7 (NEO22)

Fan

motor

Model SIC-71FW-F764-1

Current

1, 2 A 0.2

Dimensions W x H x D mm 840 x 710 x 330

Weight kg 58

Special

remarks

Air f ow (Rated) m3 /h 2,334 2,376

Sound level (Rated) dB(A) 50 53

Fan speed (Rated) rpm 650 660

Refrigerant f lling capacity (R410A) kg 2.7

1 Measured under rated operating frequency.

2 When connected with below indoor units.
MSZ-EF18VE + MSZ-EF18VE + MSZ-EF18VE + MSZ-EF18VE
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

OBH626B

11

Outdoor model MXZ-4D83VA

Outdoor unit power supply

Single phase
230 V, 50 Hz

System

Indoor units number 1 to 4

Piping total length m Max. 70

Connecting pipe length m Max. 25

Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

2 kW 8.3 ( 3.7 - 9.2 ) 9.0 ( 3.4 - 11.6 )

Breaker capacity A 25

Electrical

data

Power input (Total) 1, 2 W 2,830 2,420

Running current (Total)

1, 2 A 12.4 10.6

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 12.4

Coeff cient of performance (C.O.P) (Total)

1, 2 2.93 3.72

Compressor

Model TNB220FMCH

Output W 2,100

Current

1, 2 A 11.76 9.96

Refrigeration oil (Model) L 0.87 (NEO22)

Fan

motor

Model RC0J60-CC

Current

1, 2 A 0.4

Dimensions W x H x D mm 900 x 915 x 320

Weight kg 69

Special

remarks

Air f ow (Rated) m3 /h 2,526 2,628

Sound level (Rated) dB(A) 49 50

Fan speed (Rated) rpm 600 620

Refrigerant f lling capacity (R410A) kg 3.5

1 Measured under rated operating frequency.

2 When connected with below indoor units.
MSZ-EF18VE + MSZ-EF18VE + MSZ-EF22VE + MSZ-EF25VE
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

OBH626B

12

Outdoor model MXZ-5D102VA

Outdoor unit power supply

Single phase
230 V, 50 Hz

System

Indoor units number 1 to 5

Piping total length m Max. 80

Connecting pipe length m Max. 25

Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

2 kW 10.2 ( 3.9 - 11.0 ) 10.5 ( 4.1 - 14.0 )

Breaker capacity A 25

Electrical

data

Power input (Total) 1, 2 W 3,910 2,900

Running current (Total)

1, 2 A 17.2 12.7

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 17.2

Coeff cient of performance (C.O.P) (Total)

1, 2 2.61 3.62

Compressor

Model TNB220FMCH

Output W 2,700

Current

1, 2 A 16.5 12.0

Refrigeration oil (Model) L 0.87 (NEO22)

Fan

motor

Model RC0J60-CC

Current

1, 2 A 0.4

Dimensions W x H x D mm 900 x 915 x 320

Weight kg 70

Special

remarks

Air f ow (Rated) m3 /h 3,396 3,558

Sound level (Rated) dB(A) 53 55

Fan speed (Rated) rpm 780 810

Refrigerant f lling capacity (R410A) kg 4.0

1 Measured under rated operating frequency.

2 When connected with below indoor units.
MSZ-EF18VE + MSZ-EF18VE + MSZ-EF22VE + MSZ-EF22VE + MSZ-EF22VE
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

OBH626B

13

NOISE CRITERIA CURVES

4

MXZ-2D53VAH

MXZ-2D33VA

MXZ-2D53VA

MXZ-2D40VA

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

49

SPL(dB(A))50LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

50

SPL(dB(A))53LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

49

SPL(dB(A))50LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

50

SPL(dB(A))53LINE

OBH626B

14

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

50

SPL(dB(A))53LINE

MXZ-3D54VA

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

50

SPL(dB(A))53LINE

MXZ-3D68VA

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

50

SPL(dB(A))53LINE

MXZ-4D72VA

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

48

SPL(dB(A))51LINE

MXZ-4D83VA

OBH626B

15

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

48

SPL(dB(A))51LINE

MXZ-5D102VA

OUTDOOR UNIT

MICROPHONE

1m

Test conditions
Cooling :Dry-bulb temperature 35°C Wet-bulb temperature 24°C
Heating :Dry-bulb temperature 7°C Wet-bulb temperature 6°C

OBH626B

16

OUTLINES AND DIMENSIONS

5

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH

Unit: mm

OBH626B

17

1.Installation space

Note : Leave front and both sides
free of obstruction.

Note : Leave rear, overhead and
both sides free of obstruction.

500 or more

100 or more

Note : Leave front and overhead
free of obstruction.

100 or more

350 or more

200 or more

500 or more

2.Service space

100 or more

500 or more

350 or more

350 or more

100 or more

Service space

Liquid pipe : Ø6.35(flared)1/4

C unit connection

B unit connection

A unit connection

Gas pipe : Ø9.52(flared)3/8
Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8

Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8

MXZ-3D54VA MXZ-3D68VA

Unit: mm

OBH626B

18

MXZ-4D72VA

Unit: mm

1.Installation space

Note : Leave front and both sides
free of obstruction.

Note : Leave rear, overhead and
both sides free of obstruction.

500 or more

100 or more

Note : Leave front and overhead
free of obstruction.

100 or more

350 or more

200 or more

500 or more

2.Service space

100 or more

500 or more

350 or more

350 or more

100 or more

Service space

Liquid pipe : Ø6.35(flared)1/4

D unit connection

C unit connection

B unit connection

Gas pipe : Ø9.52(flared)3/8
Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8

Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8

A unit connection

Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø12.7(flared)1/2

OBH626B

19

MXZ-4D83VA

MXZ-5D102VA

Unit: mm

23

612

147

405

45

Indoor and
outdoor
connect wiring
(35 x 53) hole

1.Installation space

Note : Leave front and both sides
free of obstruction.

Note : Leave rear, overhead and
both sides free of obstruction.

Air out

42

200 200500

315

355

(Bolt pitch)

387

40

27

16

16

11

24

Drain hole 42

(Fondation bolt M10)

(Fondation bolt M10)

2-U Shaped notched hole

2-12 x 36 Oval hole

Air in

Air in

32025 10

88

475

317

900

Handle

Handle

915

500 or more

100 or more

Note : Leave front and overhead
free of obstruction.

100 or more

350 or more

200 or more

500 or more

2.Service space

100 or more

500 or more

350 or more

350 or more

100 or more

Service space

Liquid pipe : Ø6.35(flared)1/4

E unit connection
(MXZ-5D102VA)

D unit connection

C unit connection

B unit connection

Gas pipe : Ø9.52(flared)3/8
Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8
Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8
Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8

A unit connection

Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø12.7(flared)1/2

OBH626B

20

WIRING DIAGRAM

6

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA

OUTDOOR

DISPLAY

P.C. BOARD

OBH626B

21

MXZ-2D53VAH

OUTDOOR

DISPLAY

P.C. BOARD

OBH626B

22

MXZ-3D54VA

OBH626B

23

MXZ-3D68VA

OBH626B

24

MXZ-4D72VA

OBH626B

25

MXZ-4D83VA

OBH626B

26

MXZ-5D102VA

OBH626B

27

REFRIGERANT SYSTEM DIAGRAM

7

a

b

Outdoor
unit

Indoor
units

10m

10m

10m

Refrigerant piping length (one way, 2 unit total)

Max.
Height
difference

Outdoor unit

precharged

(g)

20m

0

1,150

Stop valve

(with strainer #100)

LEV A

LEV B

Compressor

Defrost
thermistor
RT61

Muffler

4-way valve

Indoor unit

B

Indoor unit

A

Indoor unit

A

Indoor unit

B

Capillary tube

Capillary tube

Strainer
#100

Stop valve

(with strainer #100)

R.V. coil
OFF
ON

Refrigerant flow in cooling
Refrigerant flow in heating

Ambient
temperature
thermistor
RT65

Outdoor heat
exchanger
temperature
thermistor
RT68

FAN-OUT

HEX-OUT

Discharge
temperature
thermistor RT62

Stop valve
(with service port)

Stop valve
(with service port)

Sub muffler

Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the

tables below.

UNIT: mm (inch)

Piping length each indoor unit (a, b) 15 m

Total piping length (a+b) 20 m

Bending point for each unit 15

Total bending point 20

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

UNIT: mm

MXZ-2D33VA

MAX REFRIGERANT PIPING LENGTH

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

OBH626B

28

Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the

tables below.

UNIT: mm (inch)

Piping length each indoor unit (a, b) 20 m

Total piping length (a+b) 30 m

Bending point for each unit 20

Total bending point 30

MXZ-2D40VA

MAX REFRIGERANT PIPING LENGTH

a

b

Outdoor
unit

Indoor
units

15m

10m

15m

Refrigerant piping length (one way, 2 unit total)

Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 20)

Outdoor unit

precharged

(g)

30m

200

20m

0

1,300

Max.
Height
difference

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Stop valve

(with strainer #100)

LEV A

LEV B

Compressor

Muffler

4-way valve

Indoor unit

B

Indoor unit

A

Indoor unit

A

Indoor unit

B

Capillary tube

Capillary tube

Stop valve

(with strainer #100)

R.V. coil
OFF
ON

Refrigerant flow in cooling
Refrigerant flow in heating

Discharge
temperature

thermistor RT62

Stop valve
(with service port)

Stop valve
(with service port)

Defrost
thermistor
RT61

Distributor

Capillary tube

Strainer
#100

Ambient
temperature
thermistor
RT65

Outdoor heat
exchanger
temperature
thermistor
RT68

FAN- OUT

HEX-OUT

Sub muffler

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

UNIT: mm

OBH626B

29

Stop valve

(with strainer #100)

LEV A

LEV B

Compressor

Defrost
thermistor
RT61

Distributor

Muffler

4-way valve

Indoor unit

B

Indoor unit

A

Indoor unit

A

Indoor unit

B

Capillary tube

Capillary tube

Capillary tube

Strainer
#100

Stop valve

(with strainer #100)

R.V. coil
OFF
ON

Refrigerant flow in cooling
Refrigerant flow in heating

Ambient
temperature
thermistor
RT65

Outdoor heat
exchanger
temperature
thermistor
RT68

FAN-OUT

HEX-OUT

Discharge
temperature
thermistor RT62

Stop valve
(with service port)

Stop valve
(with service port)

Sub muffler

Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the

tables below.

UNIT: mm (inch)

Piping length each indoor unit (a, b) 20 m

Total piping length (a+b) 30 m

Bending point for each unit 20

Total bending point 30

UNIT: mm

MXZ-2D53VA MXZ-2D53VAH

MAX REFRIGERANT PIPING LENGTH

a

b

Outdoor
unit

Indoor
units

15m

10m

15m

Refrigerant piping length (one way, 2 unit total)

Calculation : Xg = 20 g/m x (Refrigerant piping length(m) - 20)

Outdoor unit

precharged

(g)

30m

200

20m

0

1,300

Max.
Height
difference

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

OBH626B

30

Strainer
#100

Power

receiver

LEV A

LEV B

LEV C

Oil separator

Compressor

Defrost
thermistor
RT61

Distributor

Muffler

4-way valve

LEV E

Indoor unit

C

Indoor unit

B

Indoor unit

A

Indoor unit

A

Indoor unit

B

Indoor unit

C

Capillary tube

Capillary tube

Capillary tube

Capillary tube

Capillary tube

Discharge
temperature
thermistor RT62

Strainer
#100

Strainer
#100

Strainer
#100

R.V. coil
OFF
ON

Refrigerant flow in cooling
Refrigerant flow in heating

Ambient
temperature
thermistor
RT65

Outdoor heat
exchanger
temperature
thermistor
RT68

FAN- OUT

HEX-OUT

Strainer
#100

Stop valve with
service port

Stop valve

High-pressure switch

(MXZ-3D68VA only)

Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the

tables below.

When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.

For further information on Different-diameter pipe, refer to "PARTS CATALOG".

UNIT: mm (inch)

UNIT: mm

MXZ-3D54VA MXZ-3D68VA

MAX REFRIGERANT PIPING LENGTH

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit C

Liquid 6.35(1/4)

Gas 9.52(3/8)

a

b

c

Outdoor
unit

Indoor
units

15m

10m

15m

Refrigerant piping length (one way, 3 unit total)

Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 40)

Max.
Height
difference

Outdoor unit

precharged

(g)

50m

200

60m

400

40m

0

2,700

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

3D54 3D68
Piping length each indoor unit (a, b, c) 25m 25m
Total piping length (a+b+c) 50m 60m
Bending point for each unit 25 25
Total bending point 50 60

OBH626B

31

Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the

tables below.

When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.

For further information on Different-diameter pipe, refer to "PARTS CATALOG".

UNIT: mm (inch)

Piping length each indoor unit (a, b, c, d) 25m

Total piping length (a+b+c+d) 60m

Bending point for each unit 25

Total bending point 60

MXZ-4D72VA

MAX REFRIGERANT PIPING LENGTH

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 12.7(1/2)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit C

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit D

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit

D

Power

receiver

LEV A

LEV B

LEV C

LEV D

Oil separator

Compressor

Muffler

4-way valve

LEV E

Indoor unit

C

Indoor unit

B

Indoor unit

A

Indoor unit

A

Indoor unit

B

Indoor unit

C

Indoor unit

D

Capillary tube

Capillary tube

Discharge
temperature
thermistor RT62

Strainer
#100

Strainer
#100

Strainer
#100

Strainer
#100

Strainer
#100

R.V. coil
OFF
ON

Refrigerant flow in cooling
Refrigerant flow in heating

Distributor

HEX-OUT

Outdoor heat
exchanger
temperature
thermistor
RT68

Defrost
thermistor
RT61

Capillary tube

Ambient
temperature
thermistor
RT65

FAN- OUT

Strainer
#100

Stop valve with
service port

Stop valve

High-pressure
switch

a

b

c

d

Outdoor
unit

Indoor
units

15m

10m

15m

Refrigerant piping length (one way, 4 unit total)

Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 40)

Max.
Height
difference

Outdoor unit

precharged

(g)

50m

200

40m

0

2,700

60m

400

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

UNIT: mm

OBH626B

32

a

b

c

d

Outdoor
unit

Indoor
units

15m

15m

10m

Refrigerant piping length (one way, 4 unit total)

Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 40)

Max.
Height
difference

Outdoor unit

precharged

(g)

50m

200

40m

0

3,500

60m

400

70m

600

Indoor unit

D

Stop valve

(with service port)

Stop valve

Power

receiver

LEV A

LEV B

LEV C

LEV D

Oil separator

Compressor

Muffler

4-way valve

LEV F

Indoor unit

C

Indoor unit

B

Indoor unit

A

Indoor unit

A

Indoor unit

B

Indoor unit

C

Indoor unit

D

Capillary tube

Capillary tube

Discharge
temperature
thermistor RT62

High-pressure
switch

Strainer
#100

Strainer
#100

Strainer
#100

Strainer
#100

Strainer
#100

R.V. coil
OFF
ON

Refrigerant flow in cooling
Refrigerant flow in heating

Strainer
#100

Distributor

Outdoor
heat
exchanger

Capillary tube

Defrost
thermistor
RT61

Outdoor heat
exchanger
temperature
thermistor
RT68

Ambient
temperature
thermistor
RT65

HEX-OUT

FAN- OUT

MXZ-4D83VA

UNIT: mm

Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the

tables below.

When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.

For further information on Different-diameter pipe, refer to "PARTS CATALOG".

UNIT: mm (inch)

Piping length each indoor unit (a, b, c, d) 25m

Total piping length (a+b+c+d) 70m

Bending point for each unit 25

Total bending point 70

MAX REFRIGERANT PIPING LENGTH

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 12.7(1/2)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit C

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit D

Liquid 6.35(1/4)

Gas 9.52(3/8)

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

OBH626B

33

a

b

c

d

Outdoor
unit

Indoor
units

15m

10m

15m

Refrigerant piping length (one way, 5 unit total)

Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 40)

e

Max.
Height
difference

Outdoor unit

precharged

(g)

50m

200

40m

0

4,000

60m

400

70m

600

80m

800

Indoor unit

E

Stop valve

(with service port)

Stop valve

Power

receiver

LEV A

LEV B

LEV C

LEV D

Oil separator

Compressor

Muffler

4-way valve

LEV F

Indoor unit

D

Indoor unit

C

Indoor unit

B

Indoor unit

A

Indoor unit

B

Indoor unit

C

Indoor unit

D

Indoor unit

A

Capillary tube

Capillary tube

Discharge
temperature
thermistor RT62

Strainer
#100

Strainer
#100

Strainer
#100

Strainer
#100

Strainer
#100

LEV E

Indoor unit

E

Strainer
#100

R.V. coil
OFF
ON

Refrigerant flow in cooling
Refrigerant flow in heating

Strainer
#100

Distributor

Outdoor
heat
exchanger

Capillary tube

Defrost
thermistor
RT61

Outdoor heat
exchanger
temperature
thermistor
RT68

Ambient
temperature
thermistor
RT65

High-pressure
switch

HEX-OUT

FAN-OUT

MXZ-5D102VA

UNIT: mm

Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the

tables below.

When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.

For further information on Different-diameter pipe, refer to "PARTS CATALOG".

UNIT: mm (inch)

Piping length each indoor unit (a, b, c, d,e) 25m

Total piping length (a+b+c+d+e) 80m

Bending point for each unit 25

Total bending point 80

MAX REFRIGERANT PIPING LENGTH

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 12.7(1/2)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit C

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit D

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit E

Liquid 6.35(1/4)

Gas 9.52(3/8)

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

OBH626B

34

PERFORMANCE CURVES

8

The standard specifications apply only to the operation of the air conditioner 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 air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

198 - 264 V 50 Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature : °CWB

(2) Indoor outlet air wet-bulb temperature : °CWB
(3) Outdoor intake air dry-bulb temperature : °CDB
(4) Total input: W
(5) Indoor intake air dry-bulb temperature : °CDB
(6) Outdoor intake air wet-bulb temperature : °CWB
(7) Total input : W

Indoor air wet and dry bulb temperature difference on the left side of the following chart shows the difference between the
indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at
service.

How to measure the indoor air wet and dry bulb temperature difference

1. Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet and dry bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air
speed is high.

2. Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake.

Cover the thermometers to prevent direct rays of the sun.

3. Check that the air filter is cleaned.

4. Open windows and doors of room.

5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL

(HEAT) MODE.

6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.

7. 10 minutes later, measure temperature again and check that the temperature does not change.

INDOOR UNIT

OUTDOOR UNIT

}

}

Cooling

Heating

Wet and dry bulb
thermometers

BACK VIEW

Wet and dry bulb
thermometers

FRONT VIEW

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH
MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA

OBH626B

35

8-1. CAPACITY AND THE INPUT CURVES

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH

Outdoor intake air Dry-bulb temperature (°C)

46454645

Outdoor intake air Dry-bulb temperature (°C)

Indoor intake air Wet-bulb temperature (°C)

Indoor intake air Wet-bulb temperature (°C)

22 class

5.2

4.8

4.4

4.0

3.6

3.2

5.8

5.4

4.9

4.5

4.0

3.6

6.0

5.5

5.0

4.6

4.1

3.7

4.1

3.8

3.5

3.2

2.9

2.6

8.8

8.0

7.3

6.6

6.0

5.3

35 class

10.9

10.0

9.1

8.2

7.3

6.5

42 class

11. 2

10.2

9.3

8.4

7.5

6.7

50 class

25 class

15 class

18 class

7.4

6.8

6.2

5.7

5.1

4.5

20 class

(MXZ-2D53)

(MXZ-2D40/53)

(

MXZ-2D53)

Indoor air Wet-bulb temperature

difference (°C)

Outdoor intake air Wet-bulb temperature (°C) Outdoor intake air Wet-bulb temperature (°C)

Indoor intake air Dry-bulb temperature (°C)

Indoor intake air Dry-bulb temperature (°C)

17.2

15.8

14.4

13.1

11. 7

10.3

9.0

7.7

26.5

24.5

22.2

20.2

18.0

16.0

13.8

11. 8

19.0

17.6

16.1

14.5

13.0

11. 6

10.0

8.6

20.9

19.1

17.5

15.9

14.2

12.6

11. 0

9.3

19.0

17.6

16.1

14.5

13.0

11. 6

10.0

8.6

22 class

25 class

35 class

42 class

(MXZ-2D53)

(MXZ-2D40/53)

26.6

24.5

22.3

20.2

18.0

16.0

13.8

11. 9

21.0

19.2

17.6

16.0

14.2

12.6

11. 1

9.4

21.9

20.2

18.3

16.6

14.8

13.2

11. 5

9.8

50 class

(

MXZ-2D53)

15 class

18 class

20 class

Indoor air Dry-bulb temperature

difference (°C)

Indoor air Wet-bulb temperature

difference (°C)

Outdoor intake air Dry-bulb temperature (°C)

46454645

Outdoor intake air Dry-bulb temperature (°C)

Indoor intake air Wet-bulb temperature (°C)

Indoor intake air Wet-bulb temperature (°C)

22 class

8.5

7.8

7.1

6.4

5.8

5.1

6.3

5.8

5.3

4.8

4.3

3.9

4.1

3.8

3.5

3.2

2.9

2.6

9.3

8.5

7.8

7.0

6.3

5.6

8.0

7.3

6.7

6.0

5.4

4.8

60 class

10.6

9.7

8.8

7.9

7.1

6.3

13.1

11. 9

10.8

9.7

8.7

7.7

9.5

8.7

8.0

7.2

6.5

5.7

13.7

12.4

11. 3

10.1

9.0

8.0

50 class

35 class

42 class

25 class

15 class

18 class

20 class

MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA

25.417.1

15.8

14.5

13.2

11. 8

10.5

9.2

7.9

19.7

18.2

16.7

15.2

13.6

12.1

10.6

9.1

23.4

21.5

19.5

17.6

15.6

13.7

11. 7

24.0

22.2

20.3

18.5

16.6

14.8

12.9

11. 1

22 class

25 class

60 class

25.9

23.9

21.9

19.9

17.9

15.9

13.9

12.0

31.4

29.0

26.6

24.1

21.7

19.3

16.9

14.5

31.9

29.4

27.0

24.5

22.1

19.6

17.2

14.7

35 class

50 class

27.0

24.9

22.8

20.7

18.7

16.6

14.5

12.4

42 class

15 class

19.0

17.6

16.1

14.5

13.0

11. 6

10.0

8.6

18 class

20 class

Indoor air Dry-bulb temperature

difference (°C)

Outdoor intake air Wet-bulb temperature (°C) Outdoor intake air Wet-bulb temperature (°C)

Indoor intake air Dry-bulb temperature (°C)

Indoor intake air Dry-bulb temperature (°C)

OBH626B

36

MXZ-4D83VA MXZ-5D102VA

Indoor air Wet-bulb temperature

diffrrence (°C)

22 class

8.5

7.8

7.1

6.4

5.8

5.1

9.3

8.5

7.8

7.0

6.3

5.6

71 class

60 class

10.6

9.7

8.8

7.9

7.1

6.3

9.5

8.7

8.0

7.2

6.5

5.7

13.7

12.4

11. 3

10.1

9.0

8.0

17.0

15.4

13.9

12.5

11. 1

9.7

42 class

35 class

13.1

11. 9

10.8

9.7

8.7

7.7

50 class

25 class

Indoor air Wet-bulb temperature

diffrrence (°C)

Outdoor intake air Dry-bulb temperature (°C)

4645

4645

Outdoor intake air Dry-bulb temperature (°C)

Indoor intake air Wet-bulb temperature (°C)

Indoor intake air Wet-bulb temperature (°C)

22 class

8.5

7.8

7.1

6.4

5.8

5.1

9.3

8.5

7.8

7.0

6.3

5.6

6.3

5.8

5.3

4.8

4.3

3.9

8.0

7.3

6.7

6.0

5.4

4.8

6.3

5.8

5.3

4.8

4.3

3.9

8.0

7.3

6.7

6.0

5.4

4.8

71 class

60 class

10.6

9.7

8.8

7.9

7.1

6.3

9.5

8.7

8.0

7.2

6.5

5.7

13.7

12.4

11. 3

10.1

9.0

8.0

17.0

15.4

13.9

12.5

11. 1

9.7

42 class

35 class

13.1

11. 9

10.8

9.7

8.7

7.7

50 class

25 class

15 class

20 class

15 class

4.1

3.8

3.5

3.2

2.9

2.6

4.1

3.8

3.5

3.2

2.9

2.6

18 class

18 class

20 class

Indoor air Dry-bulb temperature

difference (°C)

Outdoor intake air Wet-bulb temperature (°C)

Indoor intake air Dry-bulb temperature (°C)

Outdoor intake air Wet-bulb temperature (°C)

Indoor intake air Dry-bulb temperature (°C)

25.4

23.4

21.5

19.5

17.6

15.6

13.7

11. 7

24.0

22.2

20.3

18.5

16.6

14.8

12.9

11. 1

22 class

25 class

60 class

71 class

25.9

23.9

21.9

19.9

17.9

15.9

13.9

12.0

27.0

24.9

22.8

20.7

18.7

16.6

14.5

12.4

31.9

29.4

27.0

24.5

22.1

19.6

17.2

14.7

35.1

32.4

29.7

27.0

24.3

21.6

18.9

16.2

35 class

42 class

31.4

29.0

26.6

24.1

21.7

19.3

16.9

14.5

50 class

Indoor air Dry-bulb temperature

difference (°C)

25.4

23.4

21.5

19.5

17.6

15.6

13.7

11. 7

17.1

15.8

14.5

13.2

11. 8

10.5

9.2

7.9

19.7

18.2

16.7

15.2

13.6

12.1

10.6

9.1

17.1

15.8

14.5

13.2

11. 8

10.5

9.2

7.9

19.7

18.2

16.7

15.2

13.6

12.1

10.6

9.1

24.0

22.2

20.3

18.5

16.6

14.8

12.9

11. 1

22 class

25 class

60 class

71 class

25.9

23.9

21.9

19.9

17.9

15.9

13.9

12.0

27.0

24.9

22.8

20.7

18.7

16.6

14.5

12.4

31.9

29.4

27.0

24.5

22.1

19.6

17.2

14.7

35.1

32.4

29.7

27.0

24.3

21.6

18.9

16.2

35 class

42 class

31.4

29.0

26.6

24.1

21.7

19.3

16.9

14.5

50 class

15 class

20 class

15 class

19.0

17.6

16.1

14.5

13.0

11. 6

10.0

8.6

19.0

17.6

16.1

14.5

13.0

11. 6

10.0

8.6

18 class

18 class

20 class

OBH626B

37

15-class unit

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

1.0

0.5

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<

COOL>T

otal input

Frequency

Hz

050100150

0.5

1.0

1.5

2.0

<

HEAT>C

apacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<

HEAT>Total i

npu

t

Frequency

Hz

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

050100150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

050100150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

8-2. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY (single operation)
MXZ-2D33VA

20-class unit

22-class unit

25-class unit

18-class unit

OBH626B

38

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

050100150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

050100150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

050100150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

3.0

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

15-class unit

20-class unit

22-class unit

25-class unit

MXZ-2D40VA

18-class unit

OBH626B

39

35-class unit

MXZ-2D40VA

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

050100150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

3.0

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

0.5

1.0

1.5

2.0

MXZ-2D53VA MXZ-2D53VAH

15-class unit

18-class unit

20-class unit

22-class unit

OBH626B

40

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

050100150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

MXZ-2D53VA MXZ-2D53VAH

25-class unit

35-class unit

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

42-class unit

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

50-class unit

OBH626B

41

0 50 100 150

1.0

1.5

2.0

2.5

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

MXZ-3D54VA
15-class unit

22-class unit

18-class unit

20-class unit

OBH626B

42

25-class unit

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

050100150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

MXZ-3D54VA

35-class unit

42-class unit

50-class unit

OBH626B

43

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

<COOL>Capacity

Frequency

Hz

<COOL>Total input

0 50 100 150

0.5

1.0

1.5

2.0

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

050100150

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

3.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

050100150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

MXZ-3D68VA
15-class unit

22-class unit

25-class unit

20-class unit

18-class unit

OBH626B

44

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

MXZ-3D68VA

35-class unit

42-class unit

50-class unit

60-class unit

OBH626B

45

MXZ-4D72VA

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

0 50 100 150

1.0

1.5

2.0

Frequency

Hz

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

0 50 100 150

0.5

1.0

1.5

2.0

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

0 50 100 150

1.0

1.5

2.0

2.5

3.0

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

050100150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<COOL>Total input

0 50 100 150

0.5

1.0

1.5

2.0

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

15-class unit

22-class unit

25-class unit

20-class unit

18-class unit

OBH626B

46

MXZ-4D72VA

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

35-class unit

42-class unit

50-class unit

60-class unit

OBH626B

47

MXZ-4D83VA

<COOL>Capacity

Frequency

Hz

<COOL>Total input

0 50 100 150

0.5

1.0

1.5

2.0

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

<COOL>Total input

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<COOL>Total input

0 50 100 150

0.5

1.0

1.5

2.0

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

050100150

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

Frequency

Hz

050100150

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<HEAT>Capacity

<HEAT>Capacity

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

0 50 100 150

1.0

2.0

3.0

0 50 100 150

1.0

2.0

3.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

15-class unit

22-class unit

25-class unit

20-class unit

18-class unit

OBH626B

48

MXZ-4D83VA

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

42-class unit

50-class unit

60-class unit

71-class unit

35-class unit

OBH626B

49

MXZ-5D102VA

<COOL>Capacity

Frequency

Hz

<COOL>Total input

0 50 100 150

0.5

1.0

1.5

2.0

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

<COOL>Total input

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<COOL>Total input

0 50 100 150

0.5

1.0

1.5

2.0

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

050100150

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

Frequency

Hz

050100150

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<HEAT>Capacity

<HEAT>Capacity

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

0 50 100 150

1.0

1.5

2.0

0 50 100 150

1.0

2.0

3.0

0 50 100 150

1.0

2.0

3.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

15-class unit

22-class unit

25-class unit

20-class unit

18-class unit

OBH626B

50

MXZ-5D102VA

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Capacity

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

42-class unit

50-class unit

60-class unit

71-class unit

35-class unit

OBH626B

51

1. Press EMERGENCY OPERATION switch to 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.

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.

8-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION <Test run operation>

Both indoor and outdoor units are under the

same temperature/humidity condition.

Operation : TEST RUN OPERATION (Refer to 8-3.)

Dry-bulb temperature ( )

Relative humidity (%)

20

50

25

60

30

70

8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT CURVE
(single operation)

NOTE: The unit of pressure has been changed to MPa on the international system of units (SI unit system).
The conversion factor is : 1 (MPa [Gauge]) = 10.2 (kgf/cm2 [Gauge])

(1) COOL operation

MXZ-2D33VA

15-class unit

20-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

48Hz

48Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

48Hz

48Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

0

1

2

3

4

5

18-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

48Hz

48Hz

15

14

13

12

11

10

9

15 20 25 30 35

0.9

1.0

1.1

1.2

1.3

1.4

1.5

15 20 25 30 35

0

1

2

3

4

5

22-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

48Hz

48Hz

15

14

13

12

11

10

9

15 20 25 30 35

0.9

1.0

1.1

1.2

1.3

1.4

1.5

15 20 25 30 35

0

1

2

3

4

5

25-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

48Hz

48Hz

15

14

13

12

11

10

9

15 20 25 30 35

0.9

1.0

1.1

1.2

1.3

1.4

1.5

15 20 25 30 35

0

1

2

3

4

5

OBH626B

52

MXZ-2D40VA

15-class unit

20-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

42Hz

1

2

3

4

42Hz

14

13

12

11

10

9

7

8

1.1

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

42Hz

1

2

3

4

42Hz

14

13

12

11

10

9

7

8

1.1

22-class unit

25-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

42Hz

1

2

3

4

42Hz

14

13

12

11

10

9

7

8

1.1

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

42Hz

1

2

3

4

42Hz

14

13

12

11

10

9

7

8

1.1

MXZ-2D53VA MXZ-2D53VAH

35-class unit

15-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

42Hz

1

2

3

4

42Hz

14

13

12

11

10

9

7

8

1.1

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

30Hz

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

42Hz

1

2

3

4

42Hz

14

13

12

11

10

9

7

8

1.1

18-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

30Hz

1

2

3

4

30Hz

14

13

12

11

10

9

7

8

1.1

OBH626B

53

20-class unit 22-class unit

25-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

30Hz

1

2

3

4

30Hz

14

13

12

11

10

9

7

8

1.1

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

50 60

70

(%)

30Hz

1

2

3

4

30Hz

14

13

12

11

10

9

7

8

1.1

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

30Hz

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

0

1

2

3

4

5

35-class unit

42-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

70

(%)

30Hz

1

2

3

4

30Hz

14

13

12

11

10

9

7

8

1.1

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

70

0.7

0.8

0.9

1.0

1.2

1.3

1.4

(%)

15

20 25

30

35

70

(%)

30Hz

1

2

3

4

30Hz

14

13

12

11

10

9

7

8

1.1

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

30Hz

30Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

50-class unit

MXZ-2D53VA MXZ-2D53VAH

15-class unit

MXZ-3D54VA

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

40Hz

13

12

11

10

8

9

7

6

40Hz

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.6

0.7

0.8

0.9

1.0

1.1

1.2

(%)

15

20 25

30

35

50 60

70

(%)

40Hz

1

2

3

4

5

40Hz

12

11

10

9

8

7

6

OBH626B

54

22-class unit

25-class unit

20-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.6

0.7

0.8

0.9

1.0

1.1

1.2

(%)

15

20 25

30

35

50 60

70

(%)

40Hz

1

2

3

4

5

40Hz

12

11

10

9

8

7

6

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.6

0.7

0.8

0.9

1.0

1.1

1.2

40Hz

1

2

3

4

5

40Hz

12

11

10

9

8

7

6

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

40Hz

13

12

11

10

8

9

7

6

40Hz

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

35-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

40Hz

1

2

3

4

5

40Hz

13

12

11

10

9

8

7

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

MXZ-3D54VA

42-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

13

12

11

10

9

8

7

(%)

50 60

70

(%)

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

40Hz

15 20 25 30 35

1

2

3

4

5

40Hz

50-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

40Hz

1

2

3

4

5

40Hz

13

12

11

10

9

8

7

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

15-class unit

MXZ-3D68VA MXZ-4D72VA

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

13

12

11

10

8

9

7

6

30Hz

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

14

13

12

11

9

10

8

7

30Hz

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

OBH626B

55

MXZ-3D68VA MXZ-4D72VA

20-class unit

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

13

12

11

10

8

9

7

6

30Hz

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

22-class unit

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

14

13

12

11

9

10

8

7

30Hz

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

25-class unit

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

14

13

12

11

9

10

8

7

30Hz

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

35-class unit

42-class unit

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

14

13

12

11

9

10

8

7

30Hz

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

14

13

12

11

9

10

8

7

30Hz

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

50-class unit

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

14

13

12

11

9

10

8

7

30Hz

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

60-class unit

Outdoor low pressure

(MPa[Gauge])

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor unit current (A)

50 60

70

(%)

30Hz

14

13

12

11

9

10

8

7

30Hz

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

50 60

70

(%)

15 20 25 30 35

1

2

3

4

5

6

MXZ-4D83VA

15-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

24Hz

24Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

OBH626B

56

MXZ-4D83VA

20-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

24Hz

24Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.6

0.7

0.8

0.9

1.0

1.1

1.2

(%)

15

20 25

30

35

50 60

70

(%)

24Hz

1

2

3

4

5

24Hz

12

11

10

9

8

7

6

22-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.6

0.7

0.8

0.9

1.0

1.1

1.2

(%)

15

20 25

30

35

50 60

70

(%)

24Hz

1

2

3

4

5

24Hz

12

11

10

9

8

7

6

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.6

0.7

0.8

0.9

1.0

1.1

1.2

24Hz

1

2

3

4

5

24Hz

12

11

10

9

8

7

6

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

25-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

24Hz

1

2

3

4

5

24Hz

13

12

11

10

9

8

7

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

13

12

11

10

9

8

7

50 60

70

(%)

50 60

70

(%)

15 20 25 30

35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

24Hz

15 20 25 30 35

1

2

3

4

5

24Hz

35-class unit 42-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.8

0.9

1.0

1.1

1.2

1.3

1.4

24Hz

1

2

3

4

5

24Hz

14

13

12

11

10

9

8

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

60-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

24Hz

1

2

3

4

5

24Hz

13

12

11

10

9

8

7

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

50-class unit

OBH626B

57

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.8

0.9

1.0

1.1

1.2

1.3

1.4

24Hz

1

2

3

4

5

24Hz

14

13

12

11

10

9

8

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

71-class unit

MXZ-5D102VA

15-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

24Hz

24Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

20-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

24Hz

24Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.6

0.7

0.8

0.9

1.0

1.1

1.2

24Hz

1

2

3

4

5

24Hz

12

11

10

9

8

7

6

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

25-class unit 22-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.6

0.7

0.8

0.9

1.0

1.1

1.2

(%)

15

20 25

30

35

50 60

70

(%)

24Hz

1

2

3

4

5

24Hz

12

11

10

9

8

7

6

18-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

15

20 25

30

35

50 60

70

0.6

0.7

0.8

0.9

1.0

1.1

1.2

(%)

15

20 25

30

35

50 60

70

(%)

24Hz

1

2

3

4

5

24Hz

12

11

10

9

8

7

6

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

24Hz

1

2

3

4

5

24Hz

13

12

11

10

9

8

7

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

35-class unit

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

13

12

11

10

9

8

7

50 60

70

(%)

50 60

70

(%)

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

24Hz

15 20 25 30 35

1

2

3

4

5

24Hz

42-class unit

OBH626B

58

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

24Hz

1

2

3

4

5

24Hz

13

12

11

10

9

8

7

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

Ambient temperature ( )
Ambient humidity (%)

Ambient temperature ( )
Ambient humidity (%)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.8

0.9

1.0

1.1

1.2

1.3

1.4

24Hz

1

2

3

4

5

24Hz

14

13

12

11

10

9

8

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

50-class unit 60-class unit

MXZ-5D102VA

Condition :

Operation : TEST RUN OPERATION (Refer to 8-3.)

(2) HEAT operation

Dry bulb temperature (°C)

Indoor

20.0

14.5

2

1

Outdoor

7

6

151220.0

14.5

Wet bulb temperature (°C)

MXZ-2D33VA

15-class unit 20-class unit 22-class unit

25-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

18-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

Ambient temperature ( )
Ambient humidity (%

)

Ambient temperature ( )
Ambient humidity (%

)

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

0.8

0.9

1.0

1.1

1.2

1.3

1.4

24Hz

1

2

3

4

5

24Hz

14

13

12

11

10

9

8

15

20 25

30

35

50 60

70

(%)

15

20 25

30

35

50 60

70

(%)

71-class unit

OBH626B

59

MXZ-2D40VA

15-class unit

510152025

1

2

3

4

Ambient temperature ( )

48Hz

Outdoor unit current (A)

20-class unit

510152025

1

2

3

4

Ambient temperature ( )

48Hz

Outdoor unit current (A)

22-class unit

510152025

1

2

3

4

Ambient temperature ( )

48Hz

Outdoor unit current (A)

25-class unit

1

2

3

4

Ambient temperature ( )

Outdoor unit current (A)

510152025

48Hz

35-class unit

510152025

1

2

3

4

Ambient temperature ( )

48Hz

Outdoor unit current (A)

18-class unit

510152025

1

2

3

4

Ambient temperature ( )

48Hz

Outdoor unit current (A)

25-class unit

Ambient temperature ( )

Outdoor unit current (A)

1

2

3

4

5 10152025

34Hz

35-class unit 42-class unit

1

2

3

4

Ambient temperature ( )

Outdoor unit current (A)

34Hz

510152025

1

2

3

4

Ambient temperature ( )

Outdoor unit current (A)

34Hz

510152025

Ambient temperature ( )

34Hz

Outdoor unit current (A)

0 5 10 15 20 25

1

2

3

4

50-class unit

MXZ-2D53VA MXZ-2D53VAH

15-class unit 20-class unit 22-class unit

5 10152025

1

2

3

4

Ambient temperature ( )

34Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

18-class unit

510152025

1

2

3

4

Ambient temperature ( )

34Hz

Outdoor unit current (A)

OBH626B

60

22-class unit

25-class unit

35-class unit

MXZ-3D54VA

42-class unit

50-class unit

15-class unit

20-class unit

5 10152025

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

5 10152025

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

5 10152025

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

Ambient temperature (

)

Outdoor unit current (A)

48Hz

0 5 10 15 20 25

2

3

4

5

6

7

510152025

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

Ambient temperature ( )

Outdoor unit current (A)

48Hz

0510

15 20 25

2

3

4

5

6

7

Outdoor unit current (A)

Ambient temperature ( )

48Hz

0510

15 20 25

2

3

4

5

6

7

22-class unit

25-class unit

35-class unit

MXZ-3D68VA MXZ-4D72VA

42-class unit 50-class unit

15-class unit

20-class unit

60-class unit

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

2.0

3.0

4.0

5.0

6.0

7.0

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

3.0

4.0

5.0

6.0

7.0

8.0

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

2.0

3.0

4.0

5.0

6.0

7.0

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

3.0

4.0

5.0

6.0

7.0

8.0

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

3.0

4.0

5.0

6.0

7.0

8.0

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

3.0

4.0

5.0

6.0

7.0

8.0

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

3.0

4.0

5.0

6.0

7.0

8.0

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

2.0

3.0

4.0

5.0

6.0

7.0

18-class unit

Ambient temperature ( )

Outdoor unit current (A)

36Hz

0510

15 20 25

3.0

4.0

5.0

6.0

7.0

8.0

18-class unit

5 10152025

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

OBH626B

61

35-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

42-class unit

Ambient temperature ( )

Outdoor unit current (A)

32Hz

0 5 10 15 20 25

2

3

4

5

6

7

50-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

5 10152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

60-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

22-class unit

25-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

MXZ-4D83VA

15-class unit

20-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

71-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

18-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

MXZ-5D102VA

15-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

18-class unit

5 10152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

22-class unit 20-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

25-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

35-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

50-class unit

5 10152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

42-class unit

Ambient temperature ( )

Outdoor unit current (A)

32Hz

0 5 10 15 20 25

2

3

4

5

6

7

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

60-class unit 71-class unit

510152025

2

3

4

5

6

7

Ambient temperature ( )

32Hz

Outdoor unit current (A)

OBH626B

62

ACTUATOR CONTROL

9

Relation between main sensor and actuator

Sensor Purpose

Actuator

Compressor LEV

Outdoor

fan motor

R.V. coil

Defrost

heater

1

Discharge temperature thermistor Protection

Indoor coil temperature thermistor

Cooling: Coil frost prevention

Heating: High pressure protection
Defrost thermistor Heating: Defrosting
Fin temperature thermistor Protection

Ambient temperature thermistor

Control/Protection

Heating: Defrosting (Heater)

Outdoor heat exchanger
temperature thermistor

Cooling: Control/Protection

Capacity code Control

1 MXZ-2D53VAH only.

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH
MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA

OBH626B

63

Outdoor display P.C. board

SW1 SW2

ON

123456

ON

SERVICE FUNCTIONS

10

10-1. THE POSITION OF SWITCH

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH
MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH

MXZ-4D83/5D102VAMXZ-3D54/3D68/4D72VA

Oudoor control P.C. board

Oudoor control P.C. board

ON

ON

SW2

SW871

SW1

123456

ON

SW1

ON

SW1

Cool/Dry Heat

With this function, you can lock the operation mode of the outdoor unit.
Once the operation mode is locked to either COOL/DRY mode or HEAT mode, the air conditioner
operates in that mode only.
Default setting is required to activate this function.
Please explain this function to your customers and ask them whether they want to use it.

[How to lock the operation mode]
(1) Turn OFF the breaker and make sure that the LED goes off.
(2) Set SW1 or SW2 as shown in the figure below.
(3) Turn ON the breaker.

10-2. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)

MXZ-2D33VA/2D40VA/2D53VA/2D53VAH
SW1 on the outdoor display P.C. board

MXZ-4D83VA/5D102VA
SW1 on the outdoor control P.C. board

ON

5

6

SW2

ON

5

6

SW2

Cool/Dry Heat

MXZ-3D54VA/3D68VA/4D72VA
SW2 on the outdoor control P.C. board

OBH626B

64

10-3. LOWERING THE OPERATING NOISE OF THE OUTDOOR UNIT

With this function, you can lower the operating noise of the outdoor unit when the operation load is small,
for example, during night time in COOL mode.
However, note that the cooling and heating capacity can also be lowered if this function is activated.
Default setting is required to activate this function.
Please explain this function to your customers and ask them whether they want to use it.

[How to lower the operating noise]
(1) Turn OFF the breaker and make sure that the LED goes off.
(2) Set the "3" Switch of SW1 to ON to enable this function. (MXZ-2D33VA/2D40VA/2D53VA/2D53VAH/4D83VA/5D102VA)
Set the "3" Switch of SW2 to ON to enable this function. (MXZ-3D54VA/3D68VA/4D72VA)
(3) Turn ON the breaker.

ON

SW1

MXZ-2D33VA/2D40VA/2D53VA/2D53VAH
SW1 on the outdoor display P.C. board

MXZ-4D83VA/5D102VA
SW1 on the outdoor control P.C. board

ON

5

6

SW2

MXZ-3D54VA/3D68VA/4D72VA
SW2 on the outdoor control P.C. board

10-4. AUTOMATIC LINE CORRECTING

This outdoor unit has an automatic line correcting function which automatically detects and corrects improper wiring or
piping.

<MXZ-2D33VA/2D40VA/2D53VA/2D53VAH>

Improper wiring or piping can be automatically detected when one indoor unit is operated in COOL mode for 30 minutes.
When improper wiring or piping is detected, wiring lines are corrected (A to B/ B to A) with the software.

NOTE: This function may not work due to the condition or environment of the unit, such as the following:

- gas leak, closed stop valve

- unit failure such as defective LEV

- indoor/outdoor temperature

NOTE: This function does not work when the "2" of SW2 on the outdoor display
P.C. board is turned OFF.

SW2

<Correct>

Indoor/outdoor
connecting wire

Terminal
block

Refrigerant pipe

Indoor unit B

Liquid/
Gas pipe

Indoor unit A

Outdoor unit

<Incorrect wiring>

Terminal
block

Indoor unit B

Liquid/
Gas pipe

Indoor unit A

Outdoor unit

<Incorrect piping>

Terminal
block

Indoor unit B

Liquid/
Gas pipe

Indoor unit A

Outdoor unit

B
A

B
A

B
A

B
A

B
A

B
A

MXZ-2D33VA/2D40VA/2D53VA/2D53VAH
SW2 on the outdoor display P.C. board

OBH626B

65

The record of automatic line correcting can be checked in the following way:
(1) Turn OFF the breaker and make sure that the LED goes off.
(2) Turn ON the "3" of SW2 on the outdoor display P.C. board.
(3) Turn ON the breaker.
(4) Check the correction state with the LED lamps on the outdoor display P.C. board.
(5) Turn OFF the breaker and make sure that the LED goes off.
(6) Turn OFF the "3" of SW2 on the outdoor display P.C. board.
(7) Turn ON the breaker.

Number of blinks

Wiring line

LED1 (Red) LED2 (Yellow)

Once Once Not corrected

3 times 3 times Corrected

SW2

<MXZ-3D54VA/3D68VA/4D72VA/4D83VA/5D102VA>

Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871) on the
outdoor control P.C. board.
When improper wiring or piping is detected, wiring lines are corrected.
This will be completed in about 10 to 20 minutes.

[How to activate this function]

1. Check that outside temperature is above 0ºC.
(This function does not work when outside temperature is not above 0ºC. )

2. Check that the stop valves of the liquid pipe and gas pipe are open.

3. Check that the wiring between indoor and outdoor unit is correct.
(If the wiring is not correct, this function does not work.)

4. Turn ON the breaker and wait at least 1 minute.

5. Press the piping/wiring correction switch (SW871) on the outdoor P.C. board.
Do not touch energized parts.

LED indication during detection:

LED1 (Red) LED2 (Yellow) LED3 (Green)

Lighted Lighted Once

LED indication after detection:

LED1 (Red) LED2 (Yellow) LED3 (Green) Indication

Lighted Not lighted Lighted Completed (Problem corrected/Normal)

Once Once Once Not completed (Detection failed)

Other indications

Refer to "SAFETY PRECAUTIONS WHEN LED
FLASHES" located behind the service panel.

Make sure that the valves are open and the pipes are not collapsed or clogged.

6. Press the switch to cancel.
LED indication after cancel:

LED1 (Red) LED2 (Yellow) LED3 (Green)

Lighted Lighted Not lighted

NOTE: Indoor unit cannot be operated while this function is activated.
When this function is activated while indoor unit is operating, the operation will be stopped.
Operate indoor unit after the automatic line correcting is finished.
Pressing the switch during detection cancels this function.

The record of automatic line correcting can be checked in the following way:
Press the switch for more than 5 seconds
LED will show the record of automatic correcting for about 30 seconds as shown in the table below:

Number of blinks

Wiring line

LED1 (Red) LED2 (Yellow) LED3 (Green)

Once Once Lighted Not corrected

3 times 3 times Lighted Corrected

NOTE: Activate this function to check the correct wiring after replacing the outdoor P.C. board.
(Previous records are deleted when the outdoor control P.C. board is replaced.)

The record cannot be shown if automatic line correcting is not cancelled (Refer to "How to activate this function").

MXZ-2D33VA/2D40VA/2D53VA/2D53VAH
SW2 on the outdoor display P.C. board

OBH626B

66

10-6. CHANGING THE AMPERE LIMIT

With this function, you can change the current that flows in the outdoor unit.

NOTE: Use this function only when the amount of current exceeds the allowed value.

[How to change the ampere limit]
(1) Turn OFF the breaker and make sure that the LED goes off.
(2) Set SW2 as shown in the table below.
(3) Turn ON the breaker.

SW2

MXZ-4D83VA/5D102VA

10.5 A

15.5 A

Default setting

Full

10-5. PRE-HEAT CONTROL

If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor,
it may interfere the start-up of the compressor. To improve start-up condition, the compressor is energized even while it
is not operating to generate heat at the winding.
The compressor uses about 50 W when pre-heat control is turned ON. Pre-heat control is OFF(MXZ-2D33VA/2D40VA/
2D53VA/2D53VAH) / ON (MXZ-3D54VA/3D68VA/4D72VA/4D83VA/5D102VA) at the default setting.

[How to activate pre-heat control]
(1) Turn OFF the breaker and make sure that the LED goes off.
(2) Set the “4” of SW2 as shown figure below to ON to activate pre-heat control function.
(3) Turn ON the breaker.

SW2

NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.

MXZ-2D33VA/2D40VA/2D53VA/2D53VAH
SW2 on the outdoor display P.C. board

MXZ-3D54VA/3D68VA/4D72VA
MXZ-4D83VA/5D102VA
SW2 on the outdoor control P.C. board

MXZ-4D83VA/5D102VA
SW2 on the outdoor control P.C. board

OBH626B

67

11

TROUBLESHOOTING

3. Troubleshooting procedure

1)

Check if the OPERATION INDICATOR lamp on the indoor unit is f ashing on and off to indicate an abnormality. To

make sure, check how many times the OPERATION INDICATOR lamp is f ashing on and off before starting service
work

.

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

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

4) Refer to 11-2, 11-3 and 11-4.

11-1. 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 unit f rst with the remote controller, and after conf rming
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 P.C. board.

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

4) When removing the 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 housing of the connector. DO NOT pull the lead wires.

11-2. FAILURE MODE RECALL FUNCTION

This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (11-4.) disappears, the memorized failure details
can be recalled.

1. Flow chart of failure mode recall function for the indoor/outdoor unit
Refer to the service manual of indoor unit.

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH
MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA

Lead wiring

Housing point

<Incorrect>

<Correct>

OBH626B

68

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

2.Blinking pattern when outdoor unit is abnormal:

ON

OFF

No beep

Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5­second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

Does the OPERATION INDICATOR lamp on the

indoor unit blink at the interval of 0.5 seconds?

Blinks: The outdoor unit is abnormal. Beep is emit-

ted at the same timing as the blinking of the
OPERATION INDICATOR lamp. 2

Yes
(Blinks

)

No
(OFF)

The outdoor unit might be abnormal.
Conf rm if outdoor unit is abnormal according to the following procedures.

Operational procedure

Conf rm that the remote controller is in the failure mode recall function.

3

With the remote controller headed towards the indoor unit, press the
TEMPERATURE buttons to adjust the set temperature to 25 °C.

1

1 Regardless of normal or abnormal condition, 2 short

beeps are emitted as the signal is received.

The outdoor unit is abnormal.
Check the blinking pattern, and make sure that the abnormal point with
the outdoor unit failure mode table (11-2.3.).
Make sure to check at least two consecutive blinking cycles.

2

Repair the defective parts.

The outdoor unit is normal.

Release the failure mode recall function. 3

NOTE: 1. Make sure to release the failure mode recall function once 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.

Delete the memorized abnormal condition. 3

Release the failure mode recall function. 3

3 Refer to the service manual of indoor unit.

Release the failure mode recall function. 3

OBH626B

69

3. Outdoor unit failure mode table
MXZ-2D

Upper or

left lamp of

OPERATION

INDICATOR
lamp (Indoor

unit)

Abnormal point

(Failure mode/protection)

LED indication

(Outdoor P.C. board)

Condition Remedy

Indoor/

outdoor

unit failure

mode
recall

function

LED 1 LED 2

OFF None (Normal)

Not lighted Not lighted

———

2-time f ash Outdoor power system Lighted Lighted Overcurrent protection cut-out operates

3 consecutive times within 1 minute
after the compressor gets started.
Compressor protection cut-out
operates 24 consecutive times within
10 seconds after the compressor gets
started.

• Check the compressor con­necting wire.

• Refer to 11-6.

"Check of

inverter/compressor".

• Check the stop valve.

○

3-time f ash Discharge temperature

thermistor

Lighted Once Thermistor shorts or opens during

compressor running.

• Refer to 11-6. "Check of
outdoor thermistors".

○

Defrost thermistor Lighted Once

○

Ambient temperature
thermistor

Lighted Twice

○

Fin temperature thermistor Lighted 3 times

○

P.C. board temperature
thermistor

Lighted 4 times • Replace the inverter P.C.

board.

○

Outdoor heat exchanger
temperature thermistor

Lighted 9 times • Refer to 11-6. "Check of

outdoor thermistors".

○

4-time f ash Overcurrent Once Not

lighted

The overcurrent f ows into intelligent
power module.

• Check the compressor con­necting wire.

• Refer to 11-6.

"Check of

inverter/compressor".

• Check the stop valve.

—

Compressor Twice Not

lighted

The overcurrent f ows into intelligent
power module within 10 seconds after
the compressor gets started.
( The compressor gets restarted in
15 seconds.)

• Check the compressor con­necting wire.

• Refer to 11-6.

"Check of

inverter/compressor".

—

9 times Not

lighted

Waveform of compressor current is dis­torted.

—

5-time f ash Discharge temperature Lighted Lighted Discharge temperature exceeds 116 ºC

during operation.

• Check refrigerant circuit and
refrigerant amount.

• Refer to 11-6.

"Check of

LEV".

—

6-time f ash High pressure Lighted Lighted The outdoor heat exchanger tempera-

ture exceeds 70 ºC during cooling or
the indoor gas pipe temperature ex­ceeds 70 ºC during heating.

• Check refrigerant circuit and
refrigerant amount.

• Check the stop valve.

—

7-time f ash Fin temperature 3 times Not

lighted

The f n temperature exceeds 90 ºC
during operation.

• Check around outdoor unit.

• Check outdoor unit air pas­sage.

—

P.C. board temperature 4 times Not

lighted

The P.C. board temperature exceeds
80 ºC during operation.

• Refer to 11-6.

"Check of

outdoor fan motor".

—

8-time f ash Outdoor fan motor Lighted Lighted Failure occurs 3 consecutive times

within 30 seconds after the fan gets
started.

• Refer to 11-6.

"Check of

outdoor fan motor".

—

9-time f ash Nonvolatile memory data Lighted 5 times Nonvolatile memory data cannot be

read properly.

• Replace the inverter P.C.
board.

○

Power module 7 times Not

lighted

The output of the power module that
drove the compressor was shorted or
the winding of the compressor was
shorted.

• Refer to 11-6. "Check of
inverter/compressor".

○

10-time f ash Discharge temperature Lighted Lighted The discharge temperature is kept

under 50 ºC (COOL mode)/40 ºC (HEAT
mode) for more than 40 minutes.

• Check refrigerant circuit and
refrigerant amount.

• Refer to 11-6. "Check of
LEV".

—

11-time f ash Current sensor 8 times Not

lighted

The sensor circuit of current of
compressor shorts or opens during
compressor operate.

• Replace the inverter P.C.
board.

○

Bus-bar voltage 6 times Not

lighted

The bus-bar voltage exceeds 430 V or
falls to 50 V or below during compres­sor operating.

• Check the power supply.

• Replace the inverter P.C.
board.

○

14-time f ash Stop valve Lighted 12 times The current of compressor is power

module is out of order.

• Check the stop valve.

• Check refrigerant circuit and
refrigerant amount.

○

NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).

OBH626B

70

The frequency of the compressor is
kept 80Hz or more and the discharge
temperature is kept under
50°C (cooling)/40°C (heating)
for more than 40 minutes.

Abnormal point

(Failure mode/protection)

Condition

Remedy

Indoor/outdoor

unit failure mode

recall function

LED indication

(Outdoor P.C. board)

LED 1 LED 2

OFF
2-time flash

3-time flash

4-time flash

5-time flash

6-time flash

7-time flash

8-time flash

Lighted Lighted

Lighted Lighted

Lighted Once

Lighted Once
Lighted Twice

Lighted 3 times
Lighted 4 times

Lighted

9 times

Once

Not lighted

Lighted

Lighted

Lighted

Lighted

3 times

Not lighted

4 times

Not lighted

Lighted

Lighted

Lighted

Lighted

Lighted

5 times

9-time flash

10-time flash

• Replace the outdoor
control P.C. board.

• Replace the outdoor
control P.C. board.

• Check refrigerant circuit
and refrigerant amount.

• Refer to 11-6. "Check
of LEV".

• Reconnect compressor
connector.

• Refer to 11-6. "How to
check inverter/
compressor".

• Check the stop valve.

• Check refrigerant circuit
and refrigerant amount.

• Check the stop valve.

• Refer to 11-6. "Check
of outdoor fan motor".

• Check refrigerant circuit
and refrigerant amount.

• Refer to 11-6. "Check
of LEV".

• Check around outdoor
unit.

• Check outdoor unit air
passage.

• Refer to 11-6. "Check
of outdoor fan motor".

• Check the connection
of the compressor
connecting wire.

• Refer to 11-6.
"How to check
inverter/compressor".

• Check the stop valve.

• Refer to 11-6. "Check
of outdoor thermistors".

• Refer to 11-6. "Check
of outdoor thermistors".

Overcurrent protection cut-out operates
3 consecutive times within 1 minute after
the compressor gets started, or converter
protection or bus-bar voltage protection
cut-out operates 3 consecutive times
within 3 minutes after start-up.

Thermistor shorts or opens during
compressor running.

28 A current flows into intelligent power
module.

Discharge temperature exceeds 116°C
during operation.
Compressor can restart if discharge
temperature thermistor reads 100°C or
less 3 minutes later.

High-pressure is detected with the
high-pressure switch (HPS)
during operation. (MXZ-3D68/4D72/
4D83/5D102VA)

The outdoor heat exchanger
temperature exceeds 70°C during
cooling or the indoor gas pipe
temperature exceeds 70°C during
heating.

The fin temperature exceeds 89°C
during operation.

The P.C. board temperature exceeds
73°C (MXZ-3D54/3D68/4D72VA)/
87°C (MXZ-4D83/5D102VA)
during operation.

Failure occurs 3 consecutive
times within 30 seconds after the
fan gets started.

Nonvolatile memory data cannot be
read properly.

Outdoor power system

Discharge temperature
thermistor

Defrost thermistor
Ambient temperature thermistor

Fin temperature thermistor
P.C. board temperature

thermistor

Overcurrent

Discharge temperature

High pressure

Fin temperature

P.C. board temperature

Outdoor fan motor

Nonvolatile memory data

Discharge temperature

None (Normal)

Upper or left lamp of

OPERATION INDICATOR

lamp (Indoor unit)

Outdoor heat exchanger
temperature thermistor

NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).

MXZ-3D/4D/5D

OBH626B

71

11-time flash

15-time flash

• Check the connecting
wire between the outdoor
control P.C. board and
the power P.C. board.

• Replace the power P.C.
board.

• Check the connecting
wire between the control
P.C. board, the noise
filter P.C. board and
the power P.C. board.

• Check the voltage of the
power supply.

• Replace the

power P.C.

board.

• Check the voltage of the
power supply.

• Replace the outdoor
control P.C. board.

• Refer to 11-6. "Check
of LEV".

• Check the drain pump of
the indoor unit.

The communication between boards
protection cut-out operates 2
consecutive times.

Communication error occurs
between the electronic control P.C.
board and power board for more
than 10 seconds.

Current sensor protection cut-out
operates 2 consecutive times.

A short or open circuit is detected in
the current sensor during compressor
operating.

The protection cut-out of the zero cross
detecting circuit operates 10
consecutive times.

Zero cross signal cannot be detected
while the compressor is operating.

A failure is detected in the operation
of the converter during operation.

The bus-bar voltage exceeds 400 V or
falls to 200 V or below during
compressor operating.

The bus-bar voltage exceeds
400 V (MXZ-3D54/3D68/4D72VA)
430 V (MXZ-4D83/5D102VA)
or falls to 50V or below during
compressor operating.

Communication error
between P.C. boards

Current sensor

Zero cross detecting circuit

Converter

Bus-bar voltage
(1)

Bus-bar voltage
(2)
Even if this protection stop is
performed continuously three
times, it does not mean the
abnormality in outdoor power
system.

LEV and drain pump

Lighted 6 times

Lighted 7 times

5 times Not

lighted

5 times

Not

lighted

5 times

6 times

Not

lighted

Not

lighted

The indoor unit detects an abnormality
in the LEV and drain pump.

Lighted

Lighted

Abnormal point

(Failure mode/protection)

Condition

Remedy

Indoor/outdoor

unit failure mode

recall function

LED indication

(Outdoor P.C. board)

LED 1 LED 2

Upper or left lamp of
OPERATION INDICATOR

lamp (Indoor unit)

NOTE: Blinking patterns of this mode differ from the ones of "Troubleshooting check table" (11-4).

OBH626B

72

Operation start

Check the outdoor unit
LED indicator.

Refer to 11-6.
"Check of power supply".

• Indoor unit
serial signal
error
Refer to 11-6.
"How to
check
miswiring
and serial
signal error".

• COOL or HEAT
operation only
Refer to 11-6.
"Check of
R.V. coil"

• When heating, room
does not get warm.

• When cooling,
room does not cool.
Refer to 11-6.
"How to check of
inverter/compressor".
Check mispiping,
shortage of capacity

• When cooling, heat
exchanger of non­ operating indoor unit
frosts.

• When heating, non
operating indoor unit
gets warm.
Refer to 11-6.
"Check of LEV".

• When cooling, dew
drops in the non­ operating indoor
unit.
Check of mispiping

Refer to 11-4.
"Troubleshooting check table".

Both LED 1 and
LED 2 are lighting.

LED 1 or LED 2
has blinked.

Both LED 1
and LED 2
are OFF.

11-3. INSTRUCTION OF TROUBLESHOOTING

• Check the indoor unit by referring to the indoor unit service manual, and confirm whether there is any problem in the indoor
unit.

Then, check the outdoor unit by referring to this page.

OBH626B

73

11-4. TROUBLESHOOTING CHECK TABLE

MXZ-2D

No.

1

2

3

4

5

6

8

9

10

11

12

13

14

15

Symptom

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

Primary current protection

Secondary current protection

High-pressure protection

Defrosting in cooling

3 times

Lighted

Discharge temperature
protection

4 times

Lighted

Low discharge
temperature protection

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6. "Check of LEV".

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

These symptoms do not mean any abnormality of the
product, but check the following points.

• Check if indoor filters are clogged.

• Check if refrigerant is short.

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

Twice Lighted

Once

Lighted

The discharge temperature exceeds 100°C during operation.

The frequency of the compressor is kept 68 Hz (MXZ-2D33VA, MXZ-2D40
VA) /80 Hz (MXZ-2D53VA/H) or more and the discharge temperature is kept
under 50°C (COOL mode)/40°C (HEAT mode) for more than 40 minutes.

The input current exceeds 8 A (MXZ-2D33VA)/ 10 A (MXZ-2D40VA,

MXZ-2D53VA/H).

The current of the compressor exceeds 17 A.

The indoor gas pipe temperature exceeds 45°C during heating.

The indoor gas pipe temperature falls 3°C or below during cooling.

Outdoor unit
operates.

16

17

18

19

7

LED1(Red) LED2(Yellow)

Lighted Twice

Outdoor power system

Lighted 3 times

Discharge temperature
thermistor

Outdoor heat exchanger
temperature thermistor

Defrost thermistor

Lighted 7 times

Nonvolatile memory data

• Replace the inverter P.C. board.

Abnormal point / Condition Remedy

A short circuit is detected in the thermistor during operation, or when
an open circuit is detected in the thermistor after 5 minutes (in cooling)
and 10 minutes (in heating) of compressor start-up.

A short circuit is detected in the thermistor during operation, or when an
open circuit is detected in the thermistor after 5 minutes of compressor
start-up.

• Replace the inverter P.C. board.

Indication

Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started.

A short circuit is detected in the thermistor during operation, or when an
open circuit is detected in the thermistor after 10 minutes of compressor
start-up.

Condition

The nonvolatile memory data cannot be read properly.

Fin temperature
thermistor

P.C board temperature
thermistor

Lighted 4 times

Ambient temperature
thermistor

A short or open circuit is detected in the thermistor during operation.

A short or open circuit is detected in the thermistor during operation.

5 timesLighted

Overcurrent

3 times Not lighted

Discharge temperature
protection

Fin temperature
protection
P.C. board temperature
protection

High-pressure
protection

• Replace the inverter P.C. board.

Bus-bar voltage
protection

Not lighted

Outdoor fan motor

8 times Not lighted

Current sensor
protection

• Replace the inverter P.C. board.

Not lighted

Compressor

• Refer to 11-6. "Check of outdoor fan motor".

• Reconnect compressor connector.

• Refer to 11-6. "How to check inverter/compressor".

• Check the stop valve.

• Check the amount of gas and the refrigerant circuit.

• Check the stop valve.

• Check the amount of gas and refrigerant circuit.

• Refer to 11-6. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6. "Check of outdoor fan motor".

• Reconnect compressor connector.

• Refer to 11-6. "How to check inverter/compressor".

• Check the stop valve.

Twice Not lighted

4 times Not lighted

5 times Not lighted

9 times Not lighted

14 A (MXZ-2D33VA)/18 A (MXZ-2D40VA, MXZ-2D53VA/H) current flows
into intelligent power module.

The bus-bar voltage exceeds 430 V or falls to 50 V or below during
compressor operating.

Discharge temperature exceeds 116°C during operation. Compressor

can
restart if discharge temperature thermistor reads 100°C or less 3 minutes
later.

The fin temperature exceeds 90°C during operation.

The P.C. board temperature exceeds 78°C during operation.

Failure occurs 3 consecutive times within 30 seconds after the fan
gets started.

A short or open circuit is detected in the current sensor during
compressor operating.

The compressor does not synchronize with the operating power.

The outdoor heat exchanger temperature exceeds 70°C during cooling
or indoor gas pipe temperature exceeds 70°C during heating.

Outdoor unit
does not
operate.

Lighted Once

LEV and drain pump

• Check the connection of the compressor connecting
wire.

• Refer to 11-6. "How to check inverter/compressor".

• Check the stop valve.

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of LEV".

• Check the drain pump of the indoor unit.

The indoor unit detects an abnormality in the LEV and drain pump.

Lighted 11 times

Stop valve
Closed valve

Closed valve is detected by compressor current.

(MXZ-2D33VA, MXZ-2D40VA)

• Check the stop valve.

13 times

10 times

OBH626B

74

-

-

9 times

Lighted

Inverter check mode

Lighted

Lighted

Normal

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

-

5 times

Lighted

Cooling high-pressure
protection

This symptom does not mean any abnormality of the
product, but check the following points.

• Check if indoor filters are clogged.

• Check if refrigerant is short.

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

The outdoor heat exchanger temperature exceeds 58°C during operation.

20

LED1(Red) LED2(Yellow)

Abnormal point / Condition Remedy

Indication

Condition

No.

Symptom

Outdoor unit
operates
normally.

22

23

Outdoor unit
operates.

Outdoor display P.C. board (Parts side)

Lighted

8 times

Lighted

Converter protection

A failure is detected in the operation of the converter during operation.

21

• Check the voltage of power supply.

• Replace the inverter P.C. board.

LED1

LED2

The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) The flashing frequency is “2”.

ON

OFF

2.5-second OFF

2.5-second OFF

0.5-second ON

0.5-second ON

NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.6.

2. LED is lighted during normal operation.

OBH626B

75

MXZ-3D/4D/5D

LED1(Red) LED2(Yellow)

Lighted Twice

Outdoor power system

Lighted 3 times

Discharge temperature
thermistor

• Refer to 11-6. "Check of outdoor thermistors".

Outdoor heat exchanger
temperature thermistor

Defrost thermistor

Lighted 7 times

Nonvolatile memory data

• Replace the outdoor control P.C. board.

Lighted 8 times

Current sensor

• Replace the power P.C. board.

Lighted 11 times

Communication error
between P.C. boards

• Check the connecting wire between the outdoor control
P.C. board and the power P.C. board.

Lighted 12 times

Zero cross detecting
circuit

• Check the connecting wire between the outdoor control P.C.
board, the noise filter P.C. board and the power P.C. board.

Abnormal point / Condition Remedy

A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor 5 minutes (in cooling) and 10
minutes (in heating) after compressor start-up.

A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor 5 minutes after compressor start-up.

• Replace the outdoor control P.C. board.

Indication

Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started, or converter protection
or bus-bar voltage protection cut-out operates 3 consecutive times
within 3 minutes after start-up.

A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor 10 minutes after compressor start-up.

Condition

The nonvolatile memory data cannot be read properly.

Fin temperature
thermistor

P.C board temperature
thermistor

Lighted 4 times

Ambient temperature
thermistor

Current sensor protection cut-out operates 2 consecutive times.

Communication error occurs twice between the outdoor control
P.C. board and the power P.C. board for more than 10 seconds.

The protection cut-out of the zero cross detecting circuit operates 10
consecutive times.

A short or open circuit is detected in the thermistor during operation.

A short or open circuit is detected in the thermistor during operation.

5 timesLighted

IPM protection

Lock protection

3 times Not lighted

Discharge temperature
protection

Fin temperature
protection

P.C. board temperature
protection

High-pressure
protection

8 times

Not lighted

Converter protection

• Replace the power P.C. board.

Bus-bar voltage
protection (1)

• Check the voltage of power supply.

• Replace the power P.C. board or the outdoor
control P.C. board.

• Refer to 11-6. "Check of bus-bar voltage".

Bus-bar voltage
protection (2)

13 times Not lighted

Outdoor fan motor

• Refer to 11-6. "Check of outdoor fan motor".

Lighted 8 times

Current sensor
protection

• Replace the power P.C. board.

Lighted 11 times

Communication protection
between P.C. boards

• Check the connecting wire between the outdoor
control P.C. board and the power P.C. board.

Lighted 12 times

Zero cross detecting circuit
protection

• Check the connecting wire between the outdoor control P.C.
board, the noise filter P.C. board and the power P.C. board.

• Check the amount of gas and the refrigerant circuit.

• Check the stop valve.

• Check the amount of gas and refrigerant circuit.

• Refer to 11-6. "Check of LEV".

•Check refrigerant circuit and refrigerant amount.

•Refer to 11-6. "Check of outdoor fan motor".

• Reconnect compressor connector.

• Refer to 11-6. "How to check inverter/compressor".

• Check the stop valve.

• Check the power module (PAM module).

Twice Not lighted

4 times Not lighted

5 times Not lighted

6 times Not lighted

9 times Not lighted

Overcurrent is detected 30 seconds after compressor start-up.

Overcurrent is detected within 30 seconds after compressor start-up.

The bus-bar voltage falls to 200 V or below during compressor
operating.

The bus-bar voltage exceeds 400 V (MXZ-3D54/3D68/4D72VA)/
430 V (MXZ-4D83/5D102VA) or falls to 50 V or below while the
compressor is operating.

Discharge temperature exceeds 116°C during operation. Compressor can
restart if discharge temperature thermistor reads 100°C or less 3 minutes
later.

The fin temperature exceeds 89°C during operation.

The P.C. board temperature exceeds 73°C (MXZ-3D54/3D68/4D72VA)/
87°C (MXZ-4D83/5D102VA) during operation.

High-pressure is detected with the high-pressure switch (HPS) during
operation. (MXZ-3D68/4D72/4D83/5D102VA)

Pre-heat protection

•

Replace the power P.C. board

.

A failure is detected in the operation of pre-heat.

(MXZ-3D54/3D68/4D72VA)

Failure occurs 3 consecutive times within 30 seconds after the fan
gets started.

A short or open circuit is detected in the current sensor while the
compressor is operating.

Communication error occurs between the outdoor control P.C.
board and the power P.C. board for more than 10 seconds.

Zero cross signal cannot be detected while the compressor is operating.

The outdoor heat exchanger temperature exceeds 70°C during cooling
or indoor gas pipe temperature exceeds 70°C during heating.

A failure is detected in the operation of the converter during operation.

Outdoor unit
does not
operate.

Lighted Once

LEV and drain pump

• Check the connection of the compressor connecting
wire.

• Refer to 11-6. "How to check inverter/compressor".

• Check the stop valve.

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of LEV".

• Check the drain pump of the indoor unit.

The indoor unit detects an abnormality in the LEV and drain pump.

No.

1

2

3

4

5

6

7

9

8

10

11

12

13

14

15

16

17

18

19

Symptom

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

OBH626B

76

Primary current protection

Secondary current protection

High-pressure protection

Defrosting in cooling

3 times

Lighted

Discharge temperature
protection

4 times

Lighted

Low discharge
temperature protection

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6. "Check of LEV".

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

5 times

Lighted

Cooling high-pressure
protection

This symptom does not mean any abnormality of the
product, but check the following points.

• Check indoor filters are not clogged.

• Check there is sufficient refrigerant.

• Check indoor/outdoor unit air circulation is not short cycling.

-

-

These symptoms do not mean any abnormality of the
product, but check the following points.

• Check indoor filters are not clogged.

• Check there is sufficient refrigerant.

• Check indoor/outdoor unit air circulation is not short cycling.

Twice Lighted

Once Lighted

The outdoor heat exchanger temperature exceeds 58°C during operation.

9 times

Lighted

Inverter check mode

Lighted

Lighted

Normal

The unit is operated with emergency operation switch.

-

The primary current exceeds 15 A (MXZ-3D54/3D68/4D72VA)/
17 A (MXZ-4D83VA)/18 A (MXZ-5D102VA).

The current of the compressor exceeds 12 A (MXZ-3D54VA) /12.5A
(MXZ-3D68/4D72VA) /10 A (MXZ-4D83/5D102VA).

The indoor gas pipe temperature exceeds 45°C during heating.

The indoor gas pipe temperature falls 3°C or below during cooling.

The discharge temperature exceeds 100°C during operation.

The frequency of the compressor is kept 80 Hz or more and the discharge
temperature is kept under 50°C (cooling) /40°C (heating) for more than
40 minutes.

LED1(Red) LED2(Yellow)

Abnormal point / Condition Remedy

Indication

Condition

No.

20

21

22

23

24

25

26

Outdoor unit
operates
normally.

Outdoor unit
operates.

Symptom

Outdoor control P.C. board(Parts side)

LED2

LED1

Lighted

LED1

LED2

Lighted

MXZ-3D54/3D68/4D72VA

MXZ-4D83/5D102VA

The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.

ON

OFF

2.5-second OFF

2.5-second OFF

0.5-second ON

0.5-second ON

NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.2.

2. LED is lighted during normal operation.

OBH626B

77

Part name Check method and criterion

Defrost thermistor (RT61)

Fin temperature thermistor (RT64)

Ambient temperature thermistor
(RT65)

Outdoor heat exchanger
temperature
thermistor (RT68)

Measure the resistance with a tester.

Refer to 11-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2.
"Outdoor control P.C. board " or 3. "Outdoor power P.C. board" for the chart of thermis­tor.

Discharge temperature thermistor
(RT62)

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

Refer to 11-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2.
"Outdoor control P.C. board ", for the chart of thermistor.

Compressor Measure the resistance between terminals with a tester.

(Winding temperature : -10 °C ~ 40 °C)

Normal (Each phase)

MXZ-2D33VA
MXZ-2D40VA

MXZ-2D53VA
MXZ-2D53VAH
MXZ-3D54VA

MXZ-3D68VA
MXZ-4D72VA

MXZ-4D83VA
MXZ-5D102VA

1.49

~ 1.84 0.86 ~ 1.06 0.63 ~ 0.78 1.29 ~ 1.49

Outdoor fan motor

MXZ-2D33VA/40VA/53VA
MXZ-2D53VAH
MXZ-4D83VA/5D102VA

Measure the resistance between lead wires with a tester.
(Part temperature : -10 °C ~ 40 °C)

Normal (Each phase)

MXZ-2D

MXZ-4D83VA
MXZ-5D102VA

12 ~ 16 13.4 ~ 16.4

Outdoor fan motor

MXZ-3D54VA/3D68VA/4D72VA

Refer to 11-6. .

R.V. coil Measure the resistance with a tester. (Part temperature : -10 °C ~ 40 °C)

Normal

MXZ-2D33VA
MXZ-2D40VA
MXZ-2D53VA
MXZ-2D53VAH
MXZ-4D83VA
MXZ-5D102VA

MXZ-3D54VA
MXZ-3D68VA
MXZ-4D72VA

1.2 k

~ 1.56 k 1.26 k ~ 1.62 k

Linear expansion valve Measure the resistance with a tester. (Part temperature : -10 °C ~ 40 °C)

Color of lead wire Normal

WHT - RED

37.4

~ 53.9

RED - ORN
YLW - RED

RED - BLU

High pressure switch (HPS)

MXZ-3D68VA/4D72VA
MXZ-4D83VA/5D102VA

Pressure Normal

HPS

3.7

0.3 MPa Close

4.8 0.2 MPa Open

Defrost heater

MXZ-2D53VAH

Measure the resistance with a tester. (Part temperature : -10 °C ~ 40 °C)

Normal

349 ~ 428

W

U

V

WHT

RED

BLK

LEV

WHT

RED

YLW

ORN

BLU

11-5. TROUBLE CRITERION OF MAIN PARTS

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH
MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA

23

W

U

V

1

WHT

RED BLK

OBH626B

78

Check of power supply

• When outdoor unit does not operate, LED on outdoor P.C. board is not lighting.

11-6. TROUBLESHOOTING FLOW

Turn ON the breaker.

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

+

-

Check the main power supply circuit for proper connections.

Is there voltage of 230V AC in the
power supply terminal block?

Is there voltage of 230V AC between
LD66B and X64 on the inverter
P.C. board?

Check the power supply and correct them.

Replace the outdoor disply P.C. board.

Replace the inverter P.C. board.

Is there voltage of 230V AC between
LD66A and LD70 on the inverter
P.C. board?

Replace the reactor.

Is there voltage of 325V DC between
DB61 and DB61 on the inverter
P.C. board?

Replace the inverter P.C. board.

Is there voltage of 5V DC between
CN936 and CN936 on the
outdoor display P.C. board?

Check the conneced wire between
the inverter P.C. board and outdoor
display P.C. board and correct it.
Replace the inverter P.C. board.

MXZ-2D33VA/2D40VA/2D53VA/2D53VAH

OBH626B

79

MXZ-3D54VA/3D68VA/4D72/4D83VA/5D102VA

Check the main power supply circuit for proper connections.

Is there voltage of 230V AC in the
power supply terminal block?

Is the output voltage from the noise
filter P.C. board 230V AC?

Is the input voltage to the outdoor
electronic control P.C. board 325V DC?

Check the power supply and correct them.

Replace the outdoor control P.C. board.

Replace the noise filter P.C. board.

Is the input voltage to the power P.C.
board 230V AC?

Replace the reactor.

Turn ON the breaker.

No

Yes

Yes

No

Yes

No

Yes

No

Replace the outdoor power P.C. board.

OBH626B

80

LED1 LED2

LED indication for communication status

Communication status is indicated by the LED.

Unit status No

Blinking: normal communication
Lighted: abnormal communication or not connected

seYNot lighted: The outdoor P.C. board is abnormal.

NOTE: "Lighted" and "Not lighted" in the table below

does not indicate abnormal.

*1 Turn OFF the breaker before

replacing the indoor electronic control
P.C. board.

MXZ-2D33/2D40/2D53VA/2D53VAH

Refer to indoor unit service manual.

Outdoor display P.C. board

oNoN
LED 1 LED 2
Unit A Unit B
status status

Yes

oNA

A

seY

seY

No

Yes

No (Lighted or
not lighted)

*1 Turn OFF the breaker before replacing the indoor electronic control
P.C. board.
Refer to indoor unit service manual.
*3 Turn OFF the breaker before replacing the inverter P.C. board.
Be careful of residual voltage of smoothing capacitor.
*4 Remove the short-circuit between outdoor terminal block
S2 and S3. Connect the indoor/outdoor connecting wire.

Turn ON the breaker.

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

Check the power supply
and correct the problem.

Press the EMERGENCY
OPERATION switch
once.

Does the OPERATION
INDICATOR lamp light
up? <Confirmation of
the power to the indoor
unit>

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

Check the indoor/outdoor
connecting wire and
correct the problem.

Replace the indoor
electronic control
P.C. board. *1

Is serial signal error
indicated 6 minutes
later?

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

Check the indoor/outdoor
connecting wire and
correct the problem.

Turn OFF the breaker.

Turn ON the breaker.

Does the LED on the
outdoor display P.C.
board or the outdoor control
P.C. board repeat quick
BLINKING and OFF? *2

Replace the indoor
electronic control
P.C. board. *1 *4

*2 The LED indicates the status of serial
communication.
Check the communication status.

Replace the inverter P.C.
board or the outdoor control
P.C. board. *3 *4

If the trouble sometimes occurs,
possible causes are as follows:

• Poor connection of the indoor/
outdoor connecting wire
Check for intermediate connection of
the indoor/outdoor connecting wire,
loose connection to the terminal block,
and cut wire inside the cable.
If any of them is found, correct the
problem(s).

• Effects of the inverter lighting
on the indoor unit
If the trouble occurs or does not occur
depending on whether the light is on
or off, distance the lighting from the
indoor unit or apply the glass filter on
the receiving part of the indoor unit.

• Noise on the indoor/outdoor
connecting wire
Pass the indoor/outdoor connecting
wire through a different route if the
existing wiring is arranged as below:

• The indoor/outdoor connecting wire
runs near the

power supply cable of

other equipment.

• The indoor/outdoor connecting wire
is detoured and run long.

Remove the
indoor/outdoor connecting
wire from the outdoor
terminal block connected
with the indoor unit on
which miswiring or the
serial signal error is
indicated. Short-circuit
between S2 and S3 of the
outdoor terminal block .

Outdoor control P.C. board

Blinking

LED1 LED2

LED3

LED 1 LED 3LED 2

Pattern

1

2

Unit B
status

Unit D

status

Unit A

status

Unit C
status

Unit E
status

Not lighted

Outdoor control P.C. board

Blinking

LED3 LED2

LED1

LED 3 LED 1LED 2

Pattern

1

2

Unit B

status

Lighted

Unit A
status

Unit D
status

Not lighted

Unit C
status

MXZ-3D54/3D68/4D72VA

MXZ-4D83/5D102VA

How to check miswiring and serial signal error (when outdoor unit does not work)

• When the indoor unit does not operate, it cannot be operated either with the remote controller or with the
EMERGENCY OPERATION switch.

• When the outdoor unit does not operate, the OPERATION INDICATOR lamp on the indoor unit flashes ON and OFF
every 0.5-second.

OBH626B

81

How to check inverter/compressor

No

No

Yes

Yes

No

Yes

No

Yes

Disconnect the connector (CNMC) between the inverter P.C. board/the
outdoor control P.C. board and compressor, or disconnet the terminal of the
compressor.
3 minutes after turning ON the breaker, start EMERGENCY OPERATION.

Is output balanced?

Replace the inverter P.C. board or
the outdoor power P.C. board.

(Except MXZ-2D)
Is the input voltage to the outdoor control
P.C. board 370V or more?

Replace the outdoor power P.C. board.

Replace the compressor.

Measure the voltage between each lead
wire leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Is there voltage of 50V AC - 250V AC? * 1, * 2

Turn OFF the breaker, and measure the
compressor winding resistance between the
compressor terminals.
Is there resistance between each
terminal normal? (Refer to 11-5.)

Reconnect the lead wire of compressor.
3 minutes after turning ON the breaker,
start EMERGENCY OPERATION.

Clarify the causes by counting time until the
inverter stops.
0 to 10 seconds: compressor layer short
10 to 60 seconds: compressor lock
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal

* 1 After the outdoor fan starts running, wait for

1 minute or more before measuring the
voltage.

The output voltage values have the

tolerance of ± 20%.

* 2 The output differs depending on the

capacity or the number of indoor units to be
operated.

• In heating, the room does not get warm.

• In cooling, the room does not get cool.

OBH626B

82

Check of outdoor thermistors

• The thermistor is abnormal.

Is the resistance of the thermistor normal? (Refer to 11-5.)

Disconnect the connector in the following table.

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

Replace the thermistor except RT64.
In case that RT64 is abnormal,
replace the inverter P.C. board or the
outdoor power P.C. board since RT64
is combined with this board.

Normal

Replace the inverter P.C. board, outdoor
control P.C. board or the outdoor power
P.C. board.

Yes

Yes

No

No

Reconnect the connector and disconnect the lead wire
leading to the compressor.
3 minutes after turning ON the breaker, start
EMERGENCY OPERATION.

Thermistor
Defrost
Discharge temperature
Fin temperature
Ambient temperature
Outdoor heat exchanger temperature

Symbol

RT61
RT62
RT64
RT65
RT68

Connector, Pin No.
CN641 pin1 and pin2
CN641 pin3 and pin4
CN642 pin1 and pin2
CN643 pin1 and pin2
CN644 pin1 and pin3

Inverter P.C. board

Outdoor control P.C. board

Outdoor power P.C. board
Outdoor control P.C. board

Outdoor control P.C. board

Outdoor power P.C. board
Outdoor control P.C. board

Board

Thermistor
Defrost
Discharge temperature
Fin temperature
Ambient temperature
Outdoor heat exchanger temperature

Symbol

RT61
RT62
RT64
RT65
RT68

Connector, Pin No.
CN661 pin1 and pin2
CN661 pin3 and pin4
CN9 pin1 and pin2
CN665 pin1 and pin2
CN661 pin7 and pin8

Board

Thermistor
Defrost
Discharge temperature
Fin temperature
Ambient temperature
Outdoor heat exchanger temperature

Symbol

RT61
RT62
RT64
RT65
RT68

Connector, Pin No.
CN661 pin1 and pin2
CN661 pin3 and pin4
CN3 pin1 and pin2
CN661 pin7 and pin8
CN663 pin1 and pin2

Board

MXZ-3D54/3D68/4D72VA

MXZ-2D30/2D40/2D53VA/2D53VAH

MXZ-4D83/5D102VA

OBH626B

83

Check of LEV

No

Yes

Yes

No

Turn ON the breaker to the outdoor unit after checking LEV
coil is mounted to the LEV body securely.

Is "click - click" sound heard?
Or, do you feel vibration of LEV coil with your hand?

Disconnect the connectors.

MXZ-2D

CN724: LEV A, CN725: LEV B

Other models

CN791: LEV A, CN792: LEV B,
CN793: LEV C, CN794: LEV D,
CN795: LEV E, CN796: LEV F

Normal

Is the resistance of the LEV coil normal?
(Refer to 11-5.)

Replace the inverter P.C. board or
the outdoor control P.C. board.

Replace LEV coil.

• In cooling, the heat exchanger of non-operating indoor unit has frosted.

• In heating, non-operating indoor unit gets warm.

CN724
CN725
CN793
CN794
CN795
CN796

Outdoor
control
P.C. board

MXZ-3D/4D/5D

MXZ-2D

Inverter
P.C. board

OBH626B

84

Check of outdoor fan motor

• Fan motor does not operate or stops operating shortly after starting the operation.

Disconnect CN932 and measure the
resistance of the outdoor fan motor.

Turn ON the breaker.
Rotate the outdoor fan motor manually and
measure the voltage of CN931.
Between (+) and (-)
Between (+) and (-)
Between (+) and (-)

Is the resistance of outdoor fan motor
normal? (Refer to 11-5.)

Does the outdoor fan motor rotate smoothly?

Does the voltage between each terminal
become 5V DC and 0V DC repeatedly?

Replace the outdoor fan motor.

Replace the inverter P.C. board or the outdoor
control P.C. board.

No

Yes

Yes

No

Yes

No

CN931
CN932

Outdoor control P.C. board

MXZ-2D MXZ-4D83VA/5D102VA

Inverter P.C. board

MXZ-2D33VA/2D40VA/2D53VA/2D53VAH
MXZ-4D83VA/5D102VA

OBH626B

85

MXZ-3D54VA/3D68VA/4D72VA

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

Disconnect CN931 and measure the
resistance of the outdoor fan motor.

Is the resistance of outdoor fan motor
normal? (Refer to right table)

Turn on the power supply to start operation
and measure the voltage of connector CN931.

Turn OFF the power supply and connect
the connector CN931.
Turn ON the power supply and measure
the voltage of connector CN931 while
rotating the motor by the hand.

Does the outdoor fan motor rotate smoothly?

Replace the outdoor fan motor.

Resistance

60 kΩ

160 kΩ

Measuring points

* To measure the resistance, connect
the negative (-) end of the tester to pin 4.

* To measure the voltage, connect the negative (-)
end of the tester to pin 4.
* Voltage between pin 4 and 6 should be measured
within 1 minute after the operation starts.

pin 1 - pin 4

pin 5 - pin 4

pin 6 - pin 4

pin 7 - pin 4

Voltage

15V DC

325 V DC

1 - 5V DC

CN931

pin 1 - pin 4

pin 5 - pin 4

pin 6 - pin 4

Is the voltage of connector CN931
normal? (Refer to right table.)

Replace the outdoor control P.C. board.

Does the voltage between pin 7 and pin 4
of connector CN931 repeat 0V and 5V?

Replace the outdoor fan motor.

Does the fan motor operate for about
5 seconds?

Replace the outdoor fan motor.

Replace the outdoor fan motor.

Replace the outdoor control P.C. board.

Start operation.

CN931

Outdoor control P.C. board

MXZ-3D54VA/3D68VA/4D72VA

OBH626B

86

Check of R.V. coil

No

Yes

No

Yes

Yes

No

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the breaker, start EMERGENCY
OPERATION in HEAT mode.

Is there voltage of 230V AC between pin 1 and
pin 2 at connector CN721?

Turn OFF the breaker. Disconnect the connector CN721.

Replace the inverter P.C. board.

Replace the 4-way valve.

Replace the R.V. coil.

Is there normal resistance
to R.V. coil?
(Refer to 11-5.)

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the breaker, start EMERGENCY
OPERATION in COOL mode.

Is there voltage of 230V AC between pin 1 and
pin 2 at connector CN721?

Replace the inverter P.C. board.

Replace the 4-way valve.

• The heating operation does not operate.

• The cooling operation does not operate.

The cooling operation or the heating operation does not operate.

MXZ-2D33VA/2D40VA/2D53VA/2D53VAH

MXZ-2D

CN721 Inverter P.C. board

OBH626B

87

No

Yes

No

Yes

No

Yes

No

Yes

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the breaker, start EMERGENCY
OPERATION in HEAT mode.

Is there voltage of 230V AC between pin 1
and pin 2 at connector CN712?

Turn OFF the breaker.
Disconnect the connector CN712.

Replace the 4-way valve.

Replace the outdoor control P.C. board.

Replace the R.V. coil.

Is there voltage 230V AC
between the pin 1 and pin 3 at
connector CN711?

Replace the noise filter P.C. board.

Is there normal resistance
to R.V. coil? (Refer to 11-5.)

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the breaker, start EMERGENCY
OPERATION in COOL mode.

Is there voltage of 230V AC between pin1 and
pin 2 at connector CN712 ?

Replace the 4-way valve.

Replace the outdoor control P.C. board.

• When heating operation does not work.

• When cooling operation does not work.

MXZ-3D54VA/3D68VA/4D72VA

CN711

CN712

Outdoor control P.C. board

MXZ-3D54VA/3D68VA/4D72VA

OBH626B

88

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the breaker, start EMERGENCY
OPERATION in HEAT mode.

Is there voltage of 230V AC between pin1 and
pin 2 at connector CN912?

Turn OFF the breaker of the indoor and the outdoor unit.

1. Turn OFF the breaker of the indoor and the outdoor unit, and

disconnect the connector CN781.

2. 3 minutes after turning ON the breaker, start

EMERGENCY OPERATION in HEAT mode.

Replace the 4-way valve.

Replace the noise filter P.C. board.

Replace the R.V. coil.

Is there voltage 12V DC
between the connector
CN781 pin 5 (+) and pin 3 (-) ?

Replace the electronic
control P.C. board.

Disconnect the connector
CN912. Is there normal
resistance to R.V. coil?
(Refer to 11-5.)

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the breaker, start EMERGENCY
OPERATION in COOL mode.

Is there voltage of 230V AC between pin1 and
pin 2 at connector CN912?

1. Turn OFF the breaker of the indoor and the outdoor
unit, and disconnect the connector CN781.

2. 3 minutes after turning ON the breaker, start
EMERGENCY OPERATION in COOL mode.

Replace the 4-way valve.

Replace the noise filter P.C. board.

Is there voltage 12V DC
between the connector CN781
pin 5 (+) and pin 3 (-) ?

Replace the outdoor control P.C. board.

If the connector CN912 is not connected or R.V. coil is open, voltage
occurs between terminals even when the control is OFF.

• When heating operation does not work.

• When cooling operation does not work.

MXZ-4D83VA/5D102VA

MXZ-4D83/5D102VAVA

CN721 Outdoor control P.C. board

OBH626B

89

Check of HPS

Infinity

0Ω

Yes

No

1. Disconnect the connector CN681.

2. Check the resistance of HPS 1 minute after the outdoor unit breaker was turned OFF.

Check the resistance between
each terminal.

Reconnect CN681.
Turn ON the breaker to the indoor and the outdoor units.
3 minutes later, start EMERGENCY OPERATION.

Is HPS protection displayed
immediately after compressor
starts?

Replace HPS.

Replace the outdoor control P.C. board.

Normal

• When the operation frequency does not go up from lowest frequency.

MXZ-3D68VA/4D72VA/4D83VA/5D102VA

MXZ-3D68VA/4D72VA/4D83VA/5D102VA

CN681 Outdoor control P.C. board

OBH626B

90

The other cases

Indoor unit does not operate. (different operating models in multi system)

• When you try to run two indoor units simultaneously, one for cooling and the other for heating, the unit which transmits signal
to the outdoor unit first decides the operation mode.

• When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, then turn them back
ON.

• Though the top of the indoor unit sometimes gets warm, this does not mean malfunction.

The reason is that the refrigerant gas continuously flows into the indoor unit even while it is not operating.

Check of bus-bar voltage

•Check the voltage of power supply.

•Conf rm outdoor unit failure mode
recall function. (Refer to 11-2.2.)

Blink 5 times

Conf rm LED1 indication lamp on the
outdoor control P.C. board.

Replace the power P.C.
board.

Blink 9 times

Replace the outdoor
control P.C. board.

Turn OFF the breaker before removing P.C. board.

Conf rm LED1 indication lamp
on the outdoor control P.C.
board.

Turn ON the breaker.
Start operation.

Blink 6 times

Replace the outdoor control
P.C. board .

Lighting

Replace the outdoor control
P.C. board.

Blink 9 times

Replace the power P.C.
board.

Conf rm LED1 indication lamp
on the outdoor control P.C.
board.

Turn ON the breaker.
Start operation.

Normal

Lighting Lighting

MXZ-3D54VA/3D68VA/4D72VA
MXZ-4D83VA/5D102VA

OBH626B

91

11-7. TEST POINT DIAGRAM AND VOLTAGE

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH

1. Inverter P.C. board

Back side of unit

-20 -10 0 10 20 30 40

0

10

20

30

40

50

60

70

80

90

100

Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger
temperature thermistor (RT68)

Discharge temperature thermistor (RT62)

0 102030405060708090100110120

0

100

200

300

400

500

600

700

0 1020304050607080

0

20

40

60

80

100

120

140

160

180

200

Fin temperature thermistor (RT64)

Connect to
outdoor dis­play P.C.
board
(CN935)

Fin temperature
thermistor/RT64
(CN642)

Ambient temperature
thermistor /RT65
(CN643)

Discharge temperature
thermistor/RT62 (CN641)

Defrost thermistor/RT61 (CN641)

230V AC
(LD66A, LD70)

Front side of unit

250 - 325V DC
(DB61(+), (-))

Output to drive
compressor
(LDU, LDV, LDW)

FUSE (F801)
T3.15AL250V

FUSE (F901)
T3.15AL250V

Signal of
outdoor fan motor
(CN931)

Outdoor heat
exchanger temperature
thermistor /RT68 (CN644)

Smoothing capacitor
(C61, C62, C63)

R.V. coil (CN721)

Heater (CN722)

MXZ-2D53VAH

FUSE (F701)
T3.15AL250V

230V AC
(X64 , LD66B)

230V AC
(LD61, LD62)

230V AC
(CN601 , )
Serial signal A
(CN601 , )
Serial signal B
(CN601

,

CN602 ,)

Output to
drive
outdoor fan
motor
(CN932)

LEV A coil
(CN724)

LEV B coil
(CN725)

OBH626B

92

2. Outdoor control P.C. board

LED 1

LED 2

CN801
Bus-bar
voltage
325 - 370
V DC
Input

(

LEV Room

A

(

12V DC

pulse wave

(

LEV Room

B

(

12V DC

pulse wave

(

LEV Room

C

(

12V DC

pulse wave

(

LEV Room

D

(

12V DC

pulse wave

(

High pressure switch

Defrost thermistor (RT61)

Discharge temperature thermistor (RT62)

Outdoor heat exchanger

temperature thermistor (RT68)

(

(

(+)

(–)

(+)

(–)

(

CN661

Signal transmission

(To power P.C. board)

5V DC pulse wave

LEV E

(

(+)

(–)

(

(+)

(–)

(

(+)

(–)

(

(+)

(–)

(

CN791

CN792

CN793

CN794

CN681 (MXZ-3D68/4D72VA)

(

(

(

F801
FUSE
T3.15AL250V

(

Ambient temperature

thermistor (RT65)

CN665

Serial signal Room D
12 - 24V DC

Serial signal Room C
12 - 24V DC

Serial signal Room B
12 - 24V DC

Serial signal Room A

12 - 24V DC

CN631

CN621

CN611

CN601

Input

SW2

CN795

12V DC

pulse wave

0 102030405060708090100110120

700

600

500

400

300

200

100

0

Resistance (kΩ)

Temperature (°C)

Discharge temperature thermistor (RT62)

-20-10 0 10203040

100

90

80

70

60

50

40

30

20

10

0

Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)

Temperature (°C)

Resistance (kΩ)

MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA

CN701

15V

15V

(+)

(–)

(

Signal reception

(From power P.C. board)

5V DC pulse wave

CN702

F930
FUSE
T3.15AL250V

CN931
To Fan motor

CN931

Bus-bar voltage

325 - 370 V DC

Input

15 VDC

Rotate instruction

Rotate signal

230V AC

CN711
230 VAC

F711 FUSE
T3.15AL250V

CN712
R.V .coil

SW871

LED 3

(–)

OBH626B

93

0 102030405060708090100110120

700

600

500

400

300

200

100

0

Resistance (kΩ)

Temperature (°C)

Discharge temperature thermistor (RT62)

-20-100 10203040

100

90

80

70

60

50

40

30

20

10

0

Resistance (kΩ)

Temperature (°C)

Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)

LED 1
LED 2

F931

FUSE

T3.15AL250V

(

CN932

20-90V AC

GND

5V DC

5V DC

pulse wave

(

To fan

motor

(+)

Rush current relay

(–)

R.V. coil (–)

CN781

CN663

CN701

CN702

CN661

CN681
High pressure switch

(

Bus-bar voltage

CN801

325 - 370 V DC

Input

LED 3

Serial signal
Room A
12~24V DC

CN631
Serial signal Room D
12~24V DC

CN641
Serial signal Room E
(MXZ-5D102VA)
12~24V DC

CN621
Serial signal Room C
12~24V DC

CN611
Serial signal Room B
12~24V DC

CN601
230V AC

Input

SW1

SW2

SW871

F801

FUSE

T3.15AL250V

CN791
LEV Room A

CN792
LEV Room B

CN794
LEV Room D

CN795
LEV Room E
(MXZ-5D102VA)

CN793
LEV Room C

(

(

+

{

CN796
LEV F
12V DC
pulse wave

Defrost temperature thermistor (RT61)

Discharge temperature thermistor (RT62)

Outdoor heat exchanger

temperature thermistor (RT68)

Ambient temperature

thermistor (RT65)

Signal transmission

(To power P.C. board)

5V DC pulse wave

Signal reception

(From power P.C. board)

5V DC pulse wave

GND

GND

15V DC

–

MXZ-4D83VA MXZ-5D102VA

OBH626B

94

MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA

3. Outdoor power P.C. board

Connect to the
compressor
Voltage among
phases: 5V to 180V

Connect to the earth

CN5
Primary current
detection
(Connect to the
noise filter)

CN2
Connect to the controller board
(+)1-5(–): Signal transmission
(To electronic control P.C. board)
5V DC pulse wave
(+)2-5(–): Zero cross signal
3-4 : Not used
(+)6-5(–): 15V
(+)7-5(–): 15V

325-370V DC
Output

(Red)

(White)

(+)

(–)

1

3

0 1020304050607080

200

180

160

140

120

100

80

60

40

20

0

Resistance (kΩ)

Temperature (°C)

Fin temperature thermistor (RT64)

Signal reception
(From electronic
control P.C.
board)
5V DC pulse
wave

(

CN3
Fin temperature
thermistor RT64

OBH626B

95

MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH

4. Outdoor display P.C. board

SW1

GND5V

LED2

LED1

To inverter P.C. board (CN936)

)

SW2

MXZ-4D83VA MXZ-5D102VA

325-370V DC
Output

(Red)

(White)

Connect to the
compressor
Voltage among
phases: 5V to 180V

Connect to the earth

CN5
Primary current detection
(Connect to the noise filter)

CN2
Connect to the controller board
(+)1-5(–): Signal transmission
(To electronic control P.C. board)
5V DC pulse wave
(+)2-5(–): Zero cross signal
3-4 : Not used
(+)6-5(–): 15V
(+)7-5(–): 15V

(+)

(–)

Signal reception (From
electronic control P.C. board)
5V DC pulse wave

)

CN3
Fin temperature thermistor RT64

1

3

0 1020304050607080

200

180

160

140

120

100

80

60

40

20

0

Resistance (kΩ)

Temperature (°C)

Fin temperature thermistor (RT64)

DM00N019 or DM00N095

OBH626B

96

MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA

5. Noise filter P.C. board

230V AC
Output

F64
FUSE
T2AL250V

{

{

CN901
To power
P.C. board

CN912
R.V. coil
230V AC

{

CN902
To power
P.C. board

CN903
To power
P.C. board

230V AC
Input

F65
FUSE
T6.3AL250V

CN61
230V AC
Output

MXZ-4D83VA MXZ-5D102VA

230V AC
Output

F64
FUSE
T2AL250V

{

CN901
To power
P.C. board

{

CN904
To power
P.C. board

CN903
To power
P.C. board

CN62
To outdoor control
P.C. board

F65
FUSE
T6.3AL250V

CN61
230V AC
Output

{

OBH626B

OPERATING PROCEDURE

PHOTOS

97

DISASSEMBLY INSTRUCTIONS

12

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the

locking mechanism.

Slide the sleeve.
Pull the terminal while
pushing the locking
lever.

Hold the sleeve, and
pull out the terminal
slowly.

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.

<"Terminal with locking mechanism" Detaching points>

Connector

Sleeve

Locking lever

Photo 1

1. Removing the cabinet and the panels

(1) Remove the screw fixing the service panel.
(2) Pull down the service panel and remove it.
(3)

Disconnect the power supply and indoor/outdoor connecting wire.
(4) Remove the screws fixing the top panel.
(5) Remove the top panel.
(6) Remove the screws fixing the cabinet.
(7) Remove the cabinet.
(8) Remove the screws fixing the back panel.
(9) Remove the back panel.

Screws of
Service
panel

Screws of
the top panel

12-1. MXZ-2D33VA MXZ-2D40VA MXZ-2D53VA MXZ-2D53VAH

NOTE: Turn OFF power supply before disassembly.

Screws of
the cabinet

Screws of the terminal
block support and the
back panel

Photo 2

Hooks

Photo 3

Screws of
the back panel

Direction
to remove

OBH626B

OPERATING PROCEDURE

PHOTOS

98

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

temperature thermistor

(1) Remove the service panel, the top panel and the cabinet
(Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting
wire and remove the back panel (Refer to 1).
(3) Remove the inverter assembly (Refer to 2).
(4) Pull out the discharge temperature thermistor from its
holder.
(5) Pull out the defrost thermistor from its holder (Photo 7).
(6) Pull out the outdoor heat exchanger temperature thermistor
from its holder (Photo 7).

Photo 6

2. Removing the inverter assembly and the inverter P.C.

board

(1) Remove the service panel, the top panel and the cabinet
(Refer to 1).
(2) Disconnect the power supply and indoor/outdoor
connecting wire and remove the back panel (Refer to 1).
(3) Disconnect all connectors and lead wires on the inverter P.C.
board.
(4) Remove the compressor connector (CNMC).
(5) Remove the screws fixing the heat sink support and the sepa­ rator.
(6) Remove the screws of the terminal block support and the
back panel. (Photo 2)
(7) Remove the inverter assembly.
(8) Remove the screw of the earth wire and screws of the termi­ nal block support.
(9) Remove the hooks of the heat sink support and remove the
heat sink support from the P.C. board support.
(

10

) Remove the screw fixing the inverter P.C. board and remove

the inverter P.C. board from the P.C. board support.

Photo 4

Photo 5

3. Removing the R.V. coil

(1) Remove the service panel, the top panel and the cabinet
(Refer to 1).
(2) Disconnect the power supply and indoor/outdoor
connecting wire and remove the back panel (Refer to 1).
(3) Remove the inverter assembly (Refer to 2).
(4) Remove the R.V. coil.

Screws of the heat sink
support and the separator

Discharge temperature thermistor (RT62)

Reactor (ACL)

Screws of the terminal
block support

Reactor
(ACL2)

Compressor
connector

Inverter
assembly

Hooks of the
heat sink
support

P.C. board
support

Screw of the earth wire
Screw of the inverter
P.C. board

R.V. coil

OBH626B

OPERATING PROCEDURE

PHOTOS

99

Defrost
thermistor
(RT61)

5. Removing the outdoor fan motor

(1) Remove the service panel, the top panel and the cabinet
(Refer to 1).
(2) Disconnect the power supply and indoor/outdoor
connecting wire.
(3) Disconnect the connectors for outdoor fan motor.
(4) Remove the propeller nut.
(5) Remove the propeller.
(6) Remove the screws fixing the fan motor.
(7) Remove the fan motor.

Photo 9

6. Removing the compressor and the 4-way valve

(1) Remove the service panel, the top panel and the cabinet
(Refer to 1).
(2) Disconnect the power supply and indoor/outdoor
connecting wire and remove the back panel (Refer to 1).
(3) Remove the inverter assembly (Refer to 2).
(4) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure gauge

shows 0 kg/cm2 (0 MPa).

(5) Detach the brazed part of the suction and the discharge pipe
connected with compressor.
(6) Remove the nuts of compressor legs.
(7) Remove the compressor.
(8) Detach the brazed part of pipes connected with 4-way valve.

Photo 8

Screws of the fan motor

Outdoor heat
exchanger
temperature
thermistor (RT68)

Propeller

Brazed parts of 4-way valve

Propeller nut

Photo 7

Base heater
(MXZ-2D53VAH only)

Photo 10

Suction pipe brazed part

Discharge pipe brazed part

Compressor nuts

OBH626B

100

12-2. MXZ-3D54VA MXZ-3D68VA MXZ-4D72VA

NOTE: Turn OFF power supply before disassembly.

OPERATING PROCEDURE

PHOTOS

1. Removing the cabinet and the panels

(1) Remove the screws of the service panel, and remove the

service panel.
(2) Remove the screws of the top panel, and remove the
top panel.
(3) Remove the screws of the cabinet, and remove the cabinet.
(4) Remove the screws of the back panel, and remove the back
panel (Photo 3).

Photo 2

Photo 1

Screws of the cabinet

Screws of the
top panel

Screw of
the cabinet

Screws of
the cabinet

Screws of
service
panel

Screws of the
top panel

Screws of the
cabinet

Screws of
the cabinet

Screws of the
sub panel

Photo 3

Screw of the rear guard

Screws of the
back panel

Screws of the
back panel

Screws of
the back panel

Screws of
the back panel

OBH626B