Mitsubishi MXZ-2D33VA-E2, MXZ-2D33VA-ET2, MXZ-2D33VA-E3, MXZ-2D33VA-ER3, MXZ-2D33VA-ET3 Service Manual

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MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH

Models

MXZ-2D33VA

E1, E2, E3, ER2, ER3, ET2, ET3

MXZ-2D40VA

E1, ER2

MXZ-2D42VA

E2, E3, ER3, ET2, ET3

MXZ-2D53VA

E1, E2, E3, ER2, ER3, ET2, ET3

MXZ-2D53VAH

E1, E2, E3, ER2, ER3

MXZ-3D54VA

MXZ-3D54VA2

E2, E3, ER2, ER3, ET2, ET3

MXZ-3D68VA

E1, E2, E3, ER2, ER3, ET2, ET3

MXZ-4D72VA

E1, E2, E3, ER2, ER3, ET2, ET3

MXZ-4D83VA

E1, E2, ER1, ER2, ET2

MXZ-5D102VA

E1, E2, ER1, ER2, ET2

MXZ-6D122VA

E1, ER1, ET1

SERVICE MANUAL

OUTDOOR UNIT

CONTENTS

1. TECHNICAL CHANGES ··································· 2

2. PART NAMES AND FUNCTIONS ····················· 6

3. SPECIFICATION ················································ 7

4. NOISE CRITERIA CURVES ···························· 17

5. OUTLINES AND DIMENSIONS ······················ 20

6. WIRING DIAGRAM ·········································· 25

7. REFRIGERANT SYSTEM DIAGRAM ············· 71

8. PERFORMANCE CURVES ····························· 81

9. ACTUATOR CONTROL ··································115

10. SERVICE FUNCTIONS ···································116

11. TROUBLESHOOTING ··································· 122

12. DISASSEMBLY INSTRUCTIONS ·················· 161

INDOOR UNITS COMBINATION SHEETS

No. OBH626

REVISED EDITION-H

HFC

utilized

R410A

PARTS CATALOG (OBB626)

Please void OBH626 REVISED EDITION-G.

Revision H:

• MXZ-6D122VA- E1,

ER1, ET1

have been added.

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

Indoor unit service manual MSZ-EF•VE Series (OBH589) MSZ-GF•VE Series (OBH634) MSZ-SF•VA Series (OBH555) MSZ-SF•VE Series (OBH600) MSZ-FH•VE Series (OBH623) MFZ-KA•VA Series (OB409) MFZ-KJ•VE Series (OBH666) 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)

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.

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 speciﬁ 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 MXZ5D102VA have been added.

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

Revision C:

• MXZ-4D83VA-

ER1

and MXZ-5D102VA-

ER1

have been added.

Revision D:

• MXZ-2D40VA

ER2

MXZ-2D42VA

- E2, MXZ-2D53VAH

- E2,

ER2

, MXZ-3D54VA2

- E2,

ER2

and MXZ-2D33/2D53/3D68/4

D72/4D83/5D102VA

- E2,

ER2

have been added.

Revision E:

• The tables of WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT for MXZ-2D33/2D53/3D68/4D72VA- E2,

ER2

MXZ-2D42VA-

, MXZ-2D53VAH- E2,

ER2

and MXZ-3D54VA2- E2,

ER2

have been added to 7. REFRIGERANT

SYSTEM DIAGRAM.

Revision F:

• MXZ-2D33/2D42/2D53/3D68/4D72/4D83/5D102VA

ET2

and MXZ-3D54VA2

ET2

have been added.

Revision H:

• MXZ-6D122VA- E1,

ER1, ET1

have been added.

Revision G:

• MXZ-2D33/2D42/2D53VA- E3,

ER3,ET3

, MXZ-2D53VAH- E3,

ER3

, MXZ-3D54VA2- E3,

ER3, ET3

and

MXZ-3D68/4D72VA-

E3, ER3,ET3

have been added.

MXZ-2C30VA -

MXZ-2D33VA -

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)

TECHNICAL CHANGES

OBH626H

MXZ-2C40VA -

MXZ-2D40VA -

MXZ-2C52VA -

MXZ-2D53VA -

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 -

MXZ-2D53VAH -

1. Grille 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 -

MXZ-3D54VA -

MXZ-3C68VA -

MXZ-3D68VA -

MXZ-4C71VA -

MXZ-4D72VA -

1. Grille 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 -

MXZ-4D83VA -

MXZ-5C100VA2 -

MXZ-5D102VA -

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

MXZ-4D83VA -

ER1

MXZ-5D102VA -

ER1

1. New model

MXZ-2D33VA -

MXZ-2D53VA -

MXZ-2D42VA -

MXZ-2D53VA -

MXZ-2D53VAH -

MXZ-3D54VA -

MXZ-3D54VA2 -

MXZ-3D68VA -

MXZ-4D72VA -

MXZ-4D83VA -

MXZ-5D102VA -

1. Indoor units combinations have been added (MFZ-KJ Series).

MXZ-4D83VA -

ER1

MXZ-4D83VA -

ER2

MXZ-5D102VA -

ER1

MXZ-5D102VA -

ER2

1. Indoor units combinations have been added (MFZ-KJ Series).

MXZ-2D33VA -

ER2

MXZ-2D53VA -

ER2

MXZ-2D53VAH -

ER2

MXZ-3D54VA2 -

ER2

MXZ-3D68VA -

ER2

MXZ-4D72VA -

ER2

1. New model

2. Indoor units combinations have been added (MFZ-KJ Series).

OBH626H

MXZ-2D40VA -

ER2

1. New model

MXZ-2D33VA -

ET2

MXZ-2D42VA -

ET2

MXZ-2D53VA -

ET2

MXZ-3D54VA2 -

ET2

MXZ-3D68VA -

ET2

MXZ-4D72VA -

ET2

MXZ-4D83VA -

ET2

MXZ-5D102VA -

ET2

1. New model

MXZ-2D33VA -

MXZ-2D42VA -

MXZ-2D53VA -

MXZ-2D53VAH -

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

2. Fuse has been added.

MXZ-2D33VA -

ER2

MXZ-2D33VA -

ER3

MXZ-2D53VA -

ER2

MXZ-2D53VA -

ER3

MXZ-2D53VAH -

ER2

MXZ-2D53VAH -

ER3

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

2. Fuse has been added.

MXZ-2D33VA -

ET2

MXZ-2D33VA -

ET3

MXZ-2D42VA -

ET2

MXZ-2D42VA -

ET3

MXZ-2D53VA -

ET2

MXZ-2D53VA -

ET3

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

2. Fuse has been added.

MXZ-2D42VA -

ER3

1. New model

MXZ-3D54VA2 -

1. High pressure switch has been added.

2. Outdoor control P.C. board has been changed.

MXZ-3D68VA -

MXZ-4D72VA -

1. Outdoor control P.C. board has been changed.

2. High pressure switch has been changed.

MXZ-3D54VA2 -

ER2

MXZ-3D54VA2 -

ER3

1. High pressure switch has been added.

2. Outdoor control P.C. board has been changed.

MXZ-3D68VA -

ER2

MXZ-3D68VA -

ER3

MXZ-4D72VA -

ER2

MXZ-4D72VA -

ER3

1. Outdoor control P.C. board has been changed.

2. High pressure switch has been changed.

MXZ-3D54VA2 -

ET2

MXZ-3D54VA2 -

ET3

1. High pressure switch has been added.

2. Outdoor control P.C. board has been changed.

OBH626H

MXZ-3D68VA -

MXZ-4D72VA -

1. Outdoor control P.C. board has been changed.

2. High pressure switch has been changed.

MXZ-3D54VA2 -

ER2

MXZ-3D54VA2 -

ER3

1. High pressure switch has been added.

2. Outdoor control P.C. board has been changed.

MXZ-3D68VA -

ER2

MXZ-3D68VA -

ER3

MXZ-4D72VA -

ER2

MXZ-4D72VA -

ER3

1. Outdoor control P.C. board has been changed.

2. High pressure switch has been changed.

MXZ-3D54VA2 -

ET2

MXZ-3D54VA2 -

ET3

1. High pressure switch has been added.

2. Outdoor control P.C. board has been changed.

MXZ-3D68VA -

ET2

MXZ-3D68VA -

ET3

MXZ-4D72VA -

ET2

MXZ-4D72VA -

ET3

1. Outdoor control P.C. board has been changed.

2. High pressure switch has been changed.

MXZ-6D122VA -

ER1

MXZ-6D122VA -

ET1

1. New model

OBH626H

PART NAMES AND FUNCTIONS

ACCESSORIES

MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH

Air inlet

Air outlet

Drain outlet

Piping

Drain hose

(Back and side)

Model

MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-4D83VA MXZ-5D102VA

MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA

MXZ-6D122VA

Drain socket 1 1 1 Drain cap 2 5

Air outlet

Drain outlet

Air inlet

(Back and side)

MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA

MXZ-4D83VA MXZ-5D102VA

MXZ-6D122VA

Air outlet

Drain outlet

Air inlet

(Back and side)

Air outlet

Drain outlet

Air inlet

(Back and side)

OBH626H

SPECIFICATION

Outdoor model MXZ-2D33VA

Outdoor unit power supply

Single phase

230 V, 50 Hz

System

Indoor units number 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

Coefﬁ 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 ﬂ ow (Rated) m3 /h 1,974 2,022

Sound level (Rated) dB(A) 49 50

Fan speed (Rated) rpm 860 880

Refrigerant ﬁ lling capacity (R410A) kg 1.15

1 Measured under rated operating frequency.

2 When connected with indoor units below. 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

OBH626H

Outdoor model MXZ-2D40VA

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 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

Coefﬁ 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 ﬂ ow (Rated) m3 /h 1,752 1,662

Sound level (Rated) dB(A) 49 50

Fan speed (Rated) rpm 840 800

Refrigerant ﬁ lling capacity (R410A) kg 1.3

1 Measured under rated operating frequency.

2 When connected with indoor units below. 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

OBH626H

Outdoor model MXZ-2D42VA

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 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 4.2 (1.1 - 4.4) 4.5 (1.0 - 4.8)

Breaker capacity A 15

Electrical

data

Power input (Total) 1, 2 W 1,000 930

Running current (Total)

1, 2 A 4.5 4.2

Power factor (Total)

1, 2% 97

Starting current (Total)

1, 2 A 4.5

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

1, 2 4.20 4.84

Compressor

Model SNB130FGBHT

Output W 1,150

Current

1, 2 A 4.0 3.6

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 37

Special

remarks

Air ﬂ ow (Rated) m3 /h 1,662 1,998

Sound level (Rated) dB(A) 46 51

Fan speed (Rated) rpm 800 910

Refrigerant ﬁ lling capacity (R410A) kg 1.3

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-EF18VE + 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

OBH626H

Outdoor model MXZ-2D53VA MXZ-2D53VAH

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 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

Coefﬁ 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 ﬂ ow (Rated) m3 /h 1,974 1,998

Sound level (Rated) dB(A) 50 53

Fan speed (Rated) rpm 900 910

Refrigerant ﬁ lling capacity (R410A) kg 1.3

1 Measured under rated operating frequency.

2 When connected with indoor units below. 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

OBH626H

Outdoor model MXZ-3D54VA MXZ-3D54VA2

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 2 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, 2W

MXZ-3D54VA: 1,390

MXZ-3D54VA2: 1,350

1,590

Running current (Total)

1, 2A

MXZ-3D54VA: 6.1

MXZ-3D54VA2: 5.9

7.0

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 7.0

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

1, 2

MXZ-3D54VA: 3.88

MXZ-3D54VA2: 4.00

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 ﬂ ow (Rated) m3 /h 2,334 2,376

Sound level (Rated) dB(A) 50 53

Fan speed (Rated) rpm 650 660

Refrigerant ﬁ lling capacity (R410A) kg 2.7

1 Measured under rated operating frequency.

2 When connected with indoor units below. 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

OBH626H

Outdoor model MXZ-3D68VA

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 2 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

Coefﬁ 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 ﬂ ow (Rated) m3 /h 2,334 2,376

Sound level (Rated) dB(A) 50 53

Fan speed (Rated) rpm 650 660

Refrigerant ﬁ lling capacity (R410A) kg 2.7

1 Measured under rated operating frequency.

2 When connected with indoor units below. 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

OBH626H

Outdoor model MXZ-4D72VA

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 2 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

Coefﬁ 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 ﬂ ow (Rated) m3 /h 2,334 2,376

Sound level (Rated) dB(A) 50 53

Fan speed (Rated) rpm 650 660

Refrigerant ﬁ lling capacity (R410A) kg 2.7

1 Measured under rated operating frequency.

2 When connected with indoor units below. 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

OBH626H

Outdoor model MXZ-4D83VA

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 2 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

Coefﬁ 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 ﬂ ow (Rated) m3 /h 2,526 2,628

Sound level (Rated) dB(A) 49 50

Fan speed (Rated) rpm 600 620

Refrigerant ﬁ lling capacity (R410A) kg 3.5

1 Measured under rated operating frequency.

2 When connected with indoor units below. 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

OBH626H

Outdoor model MXZ-5D102VA

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 2 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

Coefﬁ 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 ﬂ ow (Rated) m3 /h 3,396 3,558

Sound level (Rated) dB(A) 53 55

Fan speed (Rated) rpm 780 810

Refrigerant ﬁ lling capacity (R410A) kg 4.0

1 Measured under rated operating frequency.

2 When connected with indoor units below. 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

OBH626H

Outdoor model MXZ-6D122VA

Outdoor unit power supply

Single phase 230 V, 50 Hz

System

Indoor units number 2 to 6

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 12.2 ( 3.5 - 13.5 ) 14.0 ( 3.5 - 16.5 )

Breaker capacity A 32

Electrical

data

Power input (Total) 1, 2 W 3,660 3,310

Running current (Total)

1, 2 A 16.1 14.5

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 17.2

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

1, 2 3.33 4.23

Compressor

Model MNB33FBTM-L

Output W 1,700

Current

1, 2 A 15.26 12.94

Refrigeration oil (Model) L 1.10 (FV50S)

Fan

motor

Model SIC-81FW-D888-9

Current

1, 2 A 0.3

Dimensions W x H x D mm 950 x 1,048 x 330

Weight kg 88

Special

remarks

Air ﬂ ow (Rated) m3 /h 3,780 4,620

Sound level (Rated) dB(A) 55 57

Fan speed (Rated) rpm 650 750

Refrigerant ﬁ lling capacity (R410A) kg 4.0

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-EF22VE +MSZ-EF22VE +MSZ-EF22VE +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

OBH626H

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

SPL(dB(A))50LINE

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

SPL(dB(A))51LINE

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

SPL(dB(A))50LINE

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

SPL(dB(A))53LINE

NOISE CRITERIA CURVES

MXZ-2D53VA MXZ-2D53VAH

MXZ-2D33VA

MXZ-2D42VA

MXZ-2D40VA

OBH626H

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

SPL(dB(A))53LINE

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

SPL(dB(A))53LINE

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

SPL(dB(A))53LINE

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

SPL(dB(A))51LINE

MXZ-3D54VA MXZ-3D54VA2

MXZ-3D68VA

MXZ-4D72VA MXZ-4D83VA

OBH626H

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

SPL(dB(A))51LINE

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

SPL(dB(A))57LINE

MXZ-5D102VA MXZ-6D122VA

OUTDOOR UNIT

MICROPHONE

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

OBH626H

OUTLINES AND DIMENSIONS

MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH

Unit: mm

OBH626H

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

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-3D54VA2 MXZ-3D68VA

Unit: mm

OBH626H

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

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

OBH626H

MXZ-4D83VA

MXZ-5D102VA

Unit: mm

Liquid pipe : Ø6.35(flared)1/4

E unit connection (MXZ-5D102VA)

D unit connection

C unit connection

B unit connection

A unit connection

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

1.Installation space

Note : Leave front and both sides free of obstruction.

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

Air out

200 200500

315

355

(Bolt pitch)

387

Drain hole 42

(Fondation bolt M10)

2-U Shaped notched hole

2-12 x 36 Oval hole

Air in

32025 10

475

317

900

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

100 or more

Service space

612

147

405

Indoor and outdoor connect wiring (35 x 53) hole

OBH626H

MXZ6D122VA

Unit: mm

468134

Handle

Air Intake

Handle

330

25 15

6-ø33 Drain Hole

Air in

Air out

Air in

(Foundation Bolt M10)

2-U Shaped Notched Hole

(Foundation Bolt M10)

2-12×36 Oval Hole

(Bolt pitch)

1169780250

134

175 600 175

417

31 16370

Handle

361

563

1048

950

Liquid pipe : Ø6.35(flared)1/4

E unit connection

D unit connection

C unit connection

B unit connection

A unit connection

F 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 Liquid pipe : Ø6.35(flared)1/4 Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 Gas pipe : Ø12.7(flared)1/2

SERVICE SPACE

1.FREE SPACE

2.SERVICE SPACE

100 or more

200 or more

350 or more

500 or more

100 or more

350 or more 350 or more

500 or more

100 or more

500 or more

OBH626H

REFRIGERANT SYSTEM DIAGRAM

Outdoor unit

Indoor units

10 m

Max. Height difference

Stop valve

(with strainer #100)

LEV A

LEV B

Compressor

Defrost thermistor RT61

Muffler

4-way valve

Indoor unit

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)

Sub muffler

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

table below.

UNIT: mm

MXZ-2D33VA

UNIT: mm (inch)

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)

MAX REFRIGERANT PIPING LENGTH

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

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 2 unit total)

20 m

1,150 0

WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT MXZ-2D33VA -E2/

ER2/ET2

/E3/

ER3/ET3

No. of

MFZ-KJ

indoor units

Refrigerant piping length (L)

Maximum amount

of refrigerant

~ 20 m

None Charge-less (1,150 g) 1,150 g

1 unit 100 g additional charge (1,250 g) 1,250 g

2 units Not available -

OBH626H

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

Outdoor unit

Indoor units

15 m

10 m

15 m

Refrigerant piping length (one way, 2 unit total)

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

Outdoor unit

precharged

(g)

30 m

200

20 m

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

Capillary tube

Stop valve

(with strainer #100)

Refrigerant flow in cooling Refrigerant flow in heating

Discharge temperature

thermistor RT62

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

OBH626H

Stop valve

(with strainer #100)

LEV A

LEV B

Compressor

Defrost thermistor RT61

Distributor

Muffler

4-way valve

Indoor unit

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)

Sub muffler

UNIT: mm

MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH

MAX REFRIGERANT PIPING LENGTH

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

It is irrelevant which unit is higher.

Outdoor unit

Indoor units

15 m

10 m

15 m

Max. Height dif

ference

UNIT: mm (inch)

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)

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 2 unit total)

20 m 30 m

1,300 0 200

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

WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT MXZ-2D42VA -E2/E3/

ER3/ET2/ET3

MXZ-2D53VA -E2/E3/

ER2/ER3/ET2/ET3

MXZ-2D53VAH -E2/E3/

ER2/ER3

No. of

MFZ-KJ

indoor units

Refrigerant piping length (L)

Maximum amount

of refrigerant

~ 20 m ~ 30 m

None Charge-less (1,300 g) (L-20) x 20 g/m 1,500 g

1 unit 100 g additional charge (1,400 g) 100 g + (L-20) x 20 g/m 1,600 g

2 units 200 g additional charge (1,500 g) 200 g + (L-20) x 20 g/m 1,700 g

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table.

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".

OBH626H

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

Capillary tube

Discharge temperature

thermistor RT62

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-3D54VA2- , , only)

E3 ET3ER3

UNIT: mm (inch)

UNIT: mm

MXZ-3D54VA MXZ-3D54VA2

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)

Outdoor unit

Indoor units

15 m

10 m

15 m

Max. Height difference

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

It is irrelevant which unit is higher.

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table.

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".

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 3 unit total)

40 m 50 m 60 m

2,700 0 200 400

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

WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT MXZ-3D54VA2 -E2/E3/

ER2

ER3

ET2/ET3

No. of

MFZ-KJ

indoor units

Refrigerant piping length (L)

Maximum amount of

refrigerant

~ 40 m ~ 50 m

None Charge-less (2,700 g) (L-40) x 20 g/m 2,900 g

1 unit 100 g additional charge (2,800 g) 100 g + (L-40) x 20 g/m 3,000 g

2 units 200 g additional charge (2,900 g) 200 g + (L-40) x 20 g/m 3,100 g

3 units 300 g additional charge (3,000 g) 300 g + (L-40) x 20 g/m 3,200 g

OBH626H

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

Capillary tube

Discharge temperature thermistor RT62

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

UNIT: mm

MXZ-3D68VA

MAX REFRIGERANT PIPING LENGTH

Outdoor unit

Indoor units

15 m

10 m

15 m

Max. Height difference

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

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 3 unit total)

40 m 50 m 60 m

2,700 0 200 400

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

UNIT: mm (inch)

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)

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table.

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".

WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT MXZ-3D68VA -E2/E3/

ER2/ER3/ET2/ET3

No. of

MFZ-KJ

indoor units

Refrigerant piping length (L)

Maximum amount of

refrigerant

~ 40 m ~ 60 m

None Charge-less (2,700 g) (L-40) x 20 g/m 3,100 g

1 unit 100 g additional charge (2,800 g) 100 g + (L-40) x 20 g/m 3,200 g

2 units 200 g additional charge (2,900 g) 200 g + (L-40) x 20 g/m 3,300 g

3 units 300 g additional charge (3,000 g) 300 g + (L-40) x 20 g/m 3,400 g

OBH626H

MXZ-4D72VA

Indoor unit

Power

receiver

LEV A

LEV B

LEV C

LEV D

Oil separator

Compressor

Muffler

4-way valve

LEV E

Indoor unit

Capillary tube

Discharge temperature thermistor RT62

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

UNIT: mm

Outdoor unit

Indoor units

15 m

10 m

15 m

Max. Height difference

UNIT: mm (inch)

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)

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table.

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".

MAX REFRIGERANT PIPING LENGTH

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

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

60 m

Bending point for each unit 25

Total bending point 60

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 4 unit total)

40 m 50 m 60 m

2,700 0 200 400

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

WHEN CONNECTING TO MFZ-KJ SERIES INDOOR UNIT MXZ-4D72VA -E2/E3/

ER2/ER3/ET2/ET3

No. of

MFZ-KJ

indoor units

Refrigerant piping length (L)

Maximum amount of

refrigerant

~ 40 m ~ 60 m

None Charge-less (2,700 g) (L-40) x 20 g/m 3,100 g

1 unit 100 g additional charge (2,800 g) 100 g + (L-40) x 20 g/m 3,200 g 2 units 200 g additional charge (2,900 g) 200 g + (L-40) x 20 g/m 3,300 g 3 units 300 g additional charge (3,000 g) 300 g + (L-40) x 20 g/m 3,400 g 4 units 400 g additional charge (3,100 g) 400 g + (L-40) x 20 g/m 3,500 g

OBH626H

Outdoor unit

Indoor units

15 m

10 m

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)

50 m

200

40 m

3,500

60 m

400

70 m

600

Indoor unit

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

Capillary tube

Discharge temperature thermistor RT62

High-pressure switch

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) 25 m

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

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

OBH626H

Outdoor unit

Indoor units

15 m

10 m

15 m

Refrigerant piping length (one way, 5 unit total)

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

Max. Height difference

Outdoor unit

precharged

(g)

50 m

200

40 m

4,000

60 m

400

70 m

600

80 m

800

Indoor unit

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

Capillary tube

Discharge temperature thermistor RT62

Strainer #100

LEV E

Indoor unit

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) 25 m

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

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

OBH626H

R.V.coil

OFF Refrigerant flow in heating ON Refrigerant flow in cooling

Compressor

Oil separator

High pressure switch

Ø6.35

Ø9.52

Ø12.7

Indoor unit A

Accumulator

Ø6.35

LEV A

Ø9.52

2-way solenoid valve

Distributor

Strainer #100

Union

Header(Gas)

Stop valve

Strainer

Strainer #50

#100

Header(Evaporator)

Charge pipe

Capillary tube

Ø2.5 x Ø0.6 x 1000

Ø4.0 x Ø2.8 x 100

Ø6.35

Ø9.52 Ø9.52

Compressor shell temperature thermistor RT62

Outdoor heat exchanger temperature thermistor RT68

Ambient temperature thermistor RT65

Defrost temperature thermistor RT61

Capillary tube Ø4.0 x Ø2.8 x 100

Outdoor heat exchanger

4-way valve

Stop valve (with service port)

Indoor unit B

Indoor unit C

Indoor unit E

Ø9.52

Indoor unit D

Indoor unit F

Indoor unit A

Indoor unit B

Indoor unit C

Indoor unit D

Indoor unit E

Strainer #100

Strainer #100 LEV B

LEV E

Ø6.35

Indoor unit F

Strainer #100

LEV F

LEV D

LEV C

Outdoor unit

Indoor units

15 m

10 m

15 m

Refrigerant piping length (one way, 5 unit total)

Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 30)

Max. Height difference

Outdoor unit

precharged

(g)

50 m

400

40 m

200

4,000

60 m

600

70 m

800

80 m 1000

MXZ-6D122VA

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".

Piping length each indoor unit (a, b, c, d, e) 25 m Total piping length (a+b+c+d+e) 80 m Bending point for each unit 25 Total bending point 80

MAX REFRIGERANT PIPING LENGTH

UNIT: mm (inch)

Outdoor unit union diameter Outdoor unit union diameter

For For

Indoor unit A

Liquid 6.35(1/4)

Indoor unit D

Liquid 6.35(1/4)

Gas 12.7(1/2) Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Indoor unit E

Liquid 6.35(1/4)

Gas 9.52(3/8) Gas 9.52(3/8)

Indoor unit C

Liquid 6.35(1/4)

Indoor unit F

Liquid 6.35(1/4)

Gas 9.52(3/8) Gas 9.52(3/8)

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

OBH626H

When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere.

1) Turn off the breaker.

2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.

3) Fully close the stop valve on the liquid pipe side of the outdoor unit.

4) Turn on the breaker.

5) Start the emergency COOL operation on all the indoor units.

6) When the pressure gauge shows 0.05 to 0 MPa [Gauge] (approximately 0.5 to 0 kgf/cm²), fully close the stop valve on the gas pipe side of the outdoor unit and stop the operation. (Refer to the indoor unit installation manual about the method for stopping the operation.)

* If too much refrigerant has been added to the air conditioner system, the pressure may not drop to

0.05 to 0 MPa [Gauge]

(approximately 0.5 to 0 kgf/cm²)

, or the protection function may operate due to the pressure increase in the high-pressure refrigerant circuit. If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated.

7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping.

When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.

WARNING

PUMPING DOWN

OBH626H

115

ACTUATOR CONTROL

Relation between main sensor and actuator

Sensor Purpose

Actuator

Compressor LEV

Outdoor

fan motor

R.V. coil

Defrost

heater

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-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA MXZ-6D122VA

OBH626H

116

Outdoor display P.C. board

SW1 SW2

123456

SERVICE FUNCTIONS

10-1. THE POSITION OF SWITCH

MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA MXZ-6D122VA

MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH

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 power supply and make sure that the LED goes off. (2) Set SW1 or SW2 as shown in the figure below. (3) Turn ON the power supply.

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

MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH SW1 on the outdoor display P.C. board

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

MXZ-6D122VA SW1 on the outdoor control P.C. board

SW2

Cool/Dry Heat

SW1

Cool/Dry Heat

MXZ-3D54VA/3D54VA2/3D68VA/4D72VA SW2 on the outdoor control P.C. board

MXZ-3D54/3D68/4D72V A MXZ-3D54V A2

Oudoor control P .C. board

SW2

SW871

SW1

123456

MXZ-4D83/5D102V A

Oudoor control P.C. board

Outdoor control P .C. board

SW871

SW1

LED

MXZ-6D122VA

OBH626H

117

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 power supply and make sure that the LED goes off. (2) Set the "3" Switch of SW1 to ON to enable this function. (MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH/ 4D83VA/5D102VA) Set the "3" Switch of SW2 to ON to enable this function. (MXZ-3D54VA/3D54VA2/3D68VA/4D72VA) Set the "5" Switch of SW1 to ON to enable this function. (MXZ-6D122VA) (3) Turn ON the power supply.

SW1

MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH SW1 on the outdoor display P.C. board MXZ-4D83VA/5D102VA SW1 on the outdoor control P.C. board

MXZ-6D122VA SW1 on the outdoor control P.C. board

SW2

SW1

MXZ-3D54VA/3D54VA2/3D68VA/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/2D42VA/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

Indoor/outdoor connecting wire

Terminal block

Refrigerant pipe

Indoor unit B

Liquid/ Gas pipe

Indoor unit A

Outdoor unit

Terminal block

Indoor unit B

Liquid/ Gas pipe

Indoor unit A

Outdoor unit

Terminal block

Indoor unit B

Liquid/ Gas pipe

Indoor unit A

Outdoor unit

MXZ-2D33VA/2D40VA/2D42VA/2D53VA/ MXZ-2D53VAH SW2 on the outdoor display P.C. board

OBH626H

118

The record of automatic line correcting can be checked in the following way: (1) Turn OFF the power supply 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 power supply. (4) Check the correction state with the LED lamps on the outdoor display P.C. board. (5) Turn OFF the power supply 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 power supply.

Number of blinks

Wiring line

LED1 (Red) LED2 (Yellow)

Once Once Not corrected

3 times 3 times Corrected

SW2

<MXZ-3D54VA/3D54VA2/3D68VA/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 power supply 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/2D42VA/2D53VA/2D53VAH SW2 on the outdoor display P.C. board

OBH626H

119

<MXZ-6D122VA>

Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). 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 0˚C. (This function does not work when outside temperature is not above 0˚C.)

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 power supply and wait at least 1 minute.

5. Press the piping/wiring correction switch (SW871) on the outdoor control 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 auto line correcting is finished. Pressing the switch during detection cancels this function.

The record of auto line correcting can be confirmed in the following way:

Press the switch for more than 5 seconds. LED will show the record of auto 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").

OBH626H

120

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/2 D42VA/2D53VA/2D53VAH) / ON (MXZ-3D54VA/3D54VA2/3D68VA/4D72VA/4D83VA/5D102VA/6D122VA) at the default setting.

[How to activate pre-heat control] MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH/3D54VA/3D54VA2/3D68VA/4D72VA/4D83VA/5D102VA

(1) Turn OFF the power supply 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 power supply.

SW2

MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH SW2 on the outdoor display P.C. board

MXZ-6D122VA SW2 on the outdoor control P.C. board

MXZ-3D54VA/3D54VA2/3D68VA/4D72VA MXZ-4D83VA/5D102VA SW2 on the outdoor control P.C. board

MXZ-6D122VA

(1) Turn OFF the power supply for the air conditioner before making the setting. (2) Set the "4" of SW2 as shown figure below to OFF to activate pre-heat control function. (3) Turn ON the power supply for the air conditioner.

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

OBH626H

121

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]

MXZ-4D83VA/5D102VA

(1) Turn OFF the power supply and make sure that the LED goes off. (2) Set SW2 as shown in the table below. (3) Turn ON the power supply. SW2 on the outdoor control P.C. board

SW2

MXZ-4D83VA/5D102VA

10.5 A

15.5 A

Default setting

Full

MXZ-6D122VA

(1) Be sure to turn off the main power for the air conditioner before making the setting. (2) Make the setting referring to the table below. (3) Turn ON the power supply. SW2 on the outdoor control P.C. board

SW2

MXZ-6D122VA

20 A

Default setting

Full

OBH626H

122

TROUBLESHOOTING

3. Troubleshooting procedure

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

make sure, check how many times the OPERATION INDICATOR lamp is ﬂ 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 ﬁ rst with the remote controller, and after conﬁ rming

the horizontal vane is closed, turn OFF the power supply 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 connector housing. 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-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA MXZ-6D122VA

Lead wiring

Connector housing

OBH626H

123

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

2.Blinking pattern when outdoor unit is abnormal:

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.

Yes (Blinks

)

No (OFF)

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

Operational procedure

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

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 identify the abnormal point by referring to the outdoor unit failure mode table (11-2.3.). Make sure to check at least 2 consecutive blinking cycles.

Repair the failure parts.

The outdoor unit is normal.

Release the failure mode recall function. 3

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

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

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

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

OBH626H

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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 ﬂ 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.

"How to check

inverter/compressor".

• Check the stop valve.

○

3-time ﬂ 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 out-

door thermistors".

○

4-time ﬂ ash Overcurrent Once Not

lighted

The overcurrent ﬂ ows into intelligent power module.

• Check the compressor connecting wire.

• Refer to 11-6.

"How to check

inverter/compressor".

• Check the stop valve.

—

Compressor Twice Not

lighted

The overcurrent ﬂ 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.

"How to check

inverter/compressor".

—

9 times Not

lighted

Waveform of compressor current is distorted.

—

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

during operation.

• Check the refrigerant circuit and the refrigerant amount.

• Refer to 11-6.

"Check of LEV".

—

6-time ﬂ ash High pressure Lighted Lighted The outdoor heat exchanger temperature

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

• Check the refrigerant circuit and the refrigerant amount.

• Check the stop valve.

—

7-time ﬂ ash Fin temperature 3 times Not

lighted

The ﬁ n temperature exceeds 90 ºC during operation.

•

Check the around outdoor unit.

• Check the 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 out-

door fan motor".

—

8-time ﬂ 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 out-

door fan motor".

—

9-time ﬂ 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. "How to check inverter/compressor".

○

10-time ﬂ 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 the refrigerant circuit and the refrigerant amount.

• Refer to 11-6.

"Check of LEV".

—

11-time ﬂ 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 ﬂ ash Stop valve Lighted 12 times The current of compressor is power

module is out of order.

• Check the stop valve.

• Check the refrigerant circuit and the refrigerant amount.

○

17 time ﬂ ash Outdoor refrigerant system

abnormality

Lighted 17 times A closed valve and air trapped in the re-

frigerant circuit are detected based on the temperature sensed by the indoor and outdoor thermistors and the current of the compressor.

•

Check for a gas leak in a connecting

piping etc.

• Check the stop valve.

• Refer to 11-6.

"Check of out-

door refrigerant circuit".

○

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

OBH626H

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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 1LED 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 Once

Lighted Once Lighted Twice

Lighted 3 times Lighted 4 times

Lighted

9 times

Once

Not lighted

Lighted

E3 ER3 ET3

Lighted

3 times

Not lighted

4 times

Not lighted

Lighted

5 times

9-time flash

10-time flash

Replace the outdoor control P.C. board.

&KHFNWKHUHIULJHUDQW

circuit and the 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.

&KHFNWKHUHIULJHUDQW

circuit and the refrigerant amount.

Check the stop valve.

Refer to 11-6.

"Check

of outdoor fan motor".

&KHFNWKHUHIULJHUDQW

circuit and the refrigerant amount. Refer to 11-6.

"Check

of LEV".

&KHFNWKHDURXQGRXW

door unit.

&KHFNWKHRXWGRRUXQLW

air passage.

5HIHUWR

"Check

of outdoor fan motor".

&KHFNWKHFRQQHFWLRQ

of the compressor connecting wire.

5HIHUWR

"How to check inverter/compressor".

&KHFNWKHVWRSYDOYH

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-3D54VA2-

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 MXZ-3D54VA2)/ 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

OBH626H

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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.

5HSODFHWKH

power P.C.

board.

Check the voltage of the power supply.

5HSODFHWKHRXWGRRU

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

MXZ-3D54VA2)

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

Abnormal point

(Failure mode/protection)

Condition

Remedy

Indoor/outdoor

unit failure mode

recall function

LED indication

(Outdoor P.C. board)

LED 1LED 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).

OBH626H

127

The left lamp of

OPERATION IN-

DICATOR 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) Lighted Lighted 2-time ﬂ ash Outdoor power system Lighted Lighted

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

• Check the compressor connecting wire.

• Refer to 11-6.

"How to check in-

verter/compressor".

• Check the stop valve.

○

3-time ﬂ ash

Discharge temperature thermistor

Lighted Once

A 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 outdoor control P.C.

board.

Outdoor heat exchanger temperature thermistor

Lighted 9 times • Refer to 11-6.

"Check of outdoor

thermistors".

4-time ﬂ ash Overcurrent Once Not

lighted

28 A current ﬂ ows into power module.

• Reconnect compressor connector.

• Refer to 11-6.

"How to check in-

verter/compressor".

• Check the stop valve.

—

5-time ﬂ ash Discharge temperature Lighted Lighted

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

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6.

"Check of LEV". —

6-time ﬂ ash High pressure Lighted Lighted

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

• Check refrigerant circuit and refrigerant amount.

• Check the stop valve.

—

7-time ﬂ ash Fin temperature 3 times Not

lighted

The ﬁ n temperature exceeds 89°C during op- eration.

• Check around outdoor unit.

• Check outdoor unit air passage.

• Refer to 11-6.

"Check of outdoor

fan motor".

—

P.C. board temperature 4 times Not

lighted

The P.C. board temperature exceeds 87°C during operation.

8-time ﬂ ash Outdoor fan motor Lighted Lighted

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

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

—

9-time ﬂ ash Outdoor control system Lighted 5 times

Nonvolatile memory data cannot be read properly.

• Replace the outdoor control P.C. board.

○

10-time ﬂ ash Low discharge temperature

protection

Lighted Lighted

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 39°C for more than 20 minutes.

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6.

"Check of LEV".

—

11-time ﬂ ash Communication error

between P.C. boards

Lighted 6 times

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

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

—

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

○

Current sensor Lighted 7 times

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

—

Current sensor protection cut-out operates 2 consecutive times.

○

Zero cross detecting circuit 5 times Not

lighted

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

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

—

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

○

Converter 5 times Not

lighted

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

• Check the voltage of power supply.

• Replace the outdoor power P.C. board.

—

Bus-bar voltage 5 times Not

lighted

The bus-bar voltage exceeds 400 V or falls to low level during compressor operating.

• Check the voltage of power supply.

• Replace the outdoor control P.C. board.

15-time ﬂ ash LEV and drain pump Lighted Lighted The indoor unit detects an abnormality in

the LEV and drain pump.

• Refer to 11-6.

"Check of LEV".

• Check the drain pump of the indoor unit.

—

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

MXZ-6D

OBH626H

128

Operation start

Check the outdoor unit LED indicator.

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

,QGRRUXQLW

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

&22/RU

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

:KHQFRROLQJ

room is not cool. Refer to 11-6. "How to check inverter/ compressor".

:KHQFRROLQJKHDW

exchanger of non-operating indoor unit frosts.

:KHQKHDWLQJQRQ

operating indoor unit gets warm. Refer to 11-6. "Check of LEV".

:KHQKHDWLQJ

room does not get warm. Refer to 11-6. "How to check inverter/compressor".

&KHFNPLVSLSLQJ

shortage of capacity.

:KHQFRROLQJ

dew drops in the non-operating indoor unit. Check of misspiping.

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

Both LED1 and LED 2 are OFF.

Both LED 1 and LED 2 are lighting.

LED 1 or LED 2 has blinked.

11-3. INSTRUCTION OF TROUBLESHOOTING

• Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit. Then, check the outdoor unit with referring to this page.

OBH626H

129

11-4. TROUBLESHOOTING CHECK TABLE

MXZ-2D

No.

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 the refrigerant circuit and the 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 the refrigerant circuit and the 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 (MSZ-2D42VA, 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-2D42VA, 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.

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.

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 the refrigerant circuit. Refer to 11-6.

"Check of LEV".

&KHFNWKHUHIULJHUDQWFLUFXLWDQGWKHUHIULJHUDQWDPRXQW 5HIHUWR

"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-2D42VA, 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.

A closed valve and air trapped in the refrigerant circuit are detected based on the temperature sensed by the indoor and outdoor thermistors and the current of the compressor.

&KHFNIRUDJDVOHDNLQDFRQQHFWLQJSLSLQJHWF &KHFNWKHVWRSYDOYH 5HIHUWR

"Check of outdoor refrigerant circuit".

Lighted 17 times

Outdoor refrigerant system abnormality

13 times

10 times

OBH626H

130

9 times

Lighted

Inverter check mode

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.

LED1(Red) LED2(Yellow)

Abnormal point / Condition Remedy

Indication

Condition

No.

Symptom

Outdoor unit operates normally.

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.

Check the voltage of power supply. Replace the inverter P.C. board.

LED1

LED2

OFF

2.5-second OFF 2.5-second OFF

0.5-second ON

NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-7.4.

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

OBH626H

131

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

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.

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 the refrigerant circuit.

• Refer to 11-6. "Check of LEV".

•Check the refrigerant circuit and the 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, MXZ-3D54VA2)/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,

MXZ-3D54VA2)/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, MXZ-3D54VA2)

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.

Symptom

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

OBH626H

132

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 the refrigerant circuit and the 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 the refrigerant circuit and the 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 the indoor filters are not clogged.

• Check there is sufficient refrigerant.

• Check the 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 the indoor filters are not clogged.

• Check there is sufficient refrigerant.

• Check the 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

Normal

The unit is operated with emergency operation switch.

The primary current exceeds 15 A (MXZ-3D54/3D68/4D72VA, MXZ-3D54VA2)/17 A (MXZ-4D83VA)/18 A (MXZ-5D102VA).

The current of the compressor exceeds 12 A (MXZ-3D54VA/3D54VA2) /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.

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-3D54VA2

MXZ-4D83/5D102VA

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

OBH626H

133

No. Symptom

Indication

Abnormal point / Con-

dition

Condition Remedy

LED1(Red) LED2(Yellow)

1 Outdoor

unit does not operate.

Lighted Once LEV and drain pump

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

• Refer to 11-6.

"Check of LEV".

• Check the drain pump of the indoor unit.

Lighted Twice

Outdoor power system

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

• Check the connection of the compressor connecting wire.

• Refer to 11-6.

"How to check inverter/compres-

sor".

• Check the stop valve.

Lighted 3 times

Discharge temperature thermistor

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

• Refer to 11-6.

"Check of outdoor thermistors".

Lighted 4 times

Fin temperature thermistor

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

• Refer to 11-6.

"Check of outdoor thermistors".

P. C. board temperature thermistor

• Replace the outdoor control P.C. board.

Lighted 5 times

Ambient temperature thermistor

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

• Refer to 11-6.

"Check of outdoor thermistors".

Outdoor heat exchanger temperature thermistor

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

Defrost thermistor

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

Lighted 6 times

Zero cross detecting circuit (outdoor control P.C. board)

Zero cross signal can not be detected. • Replace the outdoor control P.C. board.

Lighted 7 times Outdoor control system

The nonvolatile memory data cannot be read properly.

• Replace the outdoor control P.C. board.

Lighted 8 times Current sensor

Current sensor protection cut-out operates 2 consecutive times.

• Replace the outdoor power P.C. board.

Lighted 11 times

Communication error between P.C. boards

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

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

M-NET communication error

M-NET adapter P.C. board detects an abnormality in the communication error.

• Check the connecting wire between M-NET adapter P.C. board and outdoor control P.C. board, or terminal bed.

Lighted 12 times

Zero cross detecting circuit (outdoor power P.C. board)

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

• Replace the outdoor power P.C. board.

Lighted 13 times Current sensor

A short or open circuit is detected in the input current detection circuit during operation.

• Replace the outdoor power P.C. board.

Lighted 14 times Voltage sensor

A short or open circuit is detected in the input voltage detection circuit during operation.

• Replace the outdoor power P.C. board.

13 Lighted 15 times Relay operation No relay operation is detected during operation. • Replace the outdoor power P.C. board. 14 'Outdoor unit

stops and restarts 3 minutes later' is repeated.

Twice Not lighted

IPM protection

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

• Reconnect compressor connector.

• Refer to 11-6.

"How to check inverter/

compressor".

• Check the stop valve.

• Check the power module (PAM module).

Lock protection

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

3 times Not lighted

Discharge temperature protection

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

• Check the amount of gas and refrigerant circuit.

• Refer to 11-6.

"Check of LEV".

4 times Not lighted

Fin temperature protection

The ﬁ n temperature exceeds during operation.

•Check refrigerant circuit and refrigerant amount.

•Refer to 11-6.

"Check of outdoor fan motor".

P.C. board temperature protection

The P.C. board temperature exceeds during operation.

5 times Not lighted

High-pressure protection

High-pressure is detected with the high-pressure switch (HPS) during operation.

• Check around of gas and the refrigerant circuit.

• Check the stop valve.

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

6 times Not lighted Pre-heating protection Overcurrent is detected during pre-heating.

• Reconnect compressor connector.

• Refer to 11-6.

"How to check inverter/

compressor".

• Check the power module.

8 times Not lighted Converter protection

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

• Replace the outdoor power P.C. board.

9 times Not lighted

Bus-bar voltage protection

The bus-bar voltage exceeds 400 V or falls to low level during compressor operating.

• Check the voltage of power supply.

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

• Refer to 11-6.

"Check of bus-bar voltage".

MXZ-6D

OBH626H

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No. Symptom

Indication

Abnormal point / Con-

dition

Condition Remedy

LED1(Red) LED2(Yellow)

21 'Outdoor unit

stops and restarts 3 minutes later' is repeated.

13 times Not lighted Outdoor fan motor

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

• Refer to 11-6.

"Check of outdoor fan motor".

Lighted 8 times

Current sensor protection

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

• Replace the outdoor power P.C. board.

Lighted 11 times

Communication between P.C. boards protection

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

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

Lighted 12 times

Zero cross detecting circuit (outdoor power P.C. board)

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

• Replace the outdoor power P.C. board.

25 Outdoor unit

operates.

Once Lighted

Primary current protection

The input current exceeds 15 A.

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

• Check if indoor ﬁ lters are clogged.

• Check if refrigerant is short.

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

Twice Lighted

High-pressure protection

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

Defrosting in cooling

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

3 times Lighted

Discharge temperature protection

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

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6.

"Check of LEV".

• Refer to 11-6.

"Check of outdoor thermistors".

4 times Lighted

Low discharge temperature protection

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 39°C for more than 20 minutes.

• Refer to 11-6.

"Check of LEV".

• Check refrigerant circuit and refrigerant amount.

5 times Lighted

Cooling high-pressure protection

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

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

• Check if indoor ﬁ lters are clogged.

• Check if refrigerant is short.

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

Outdoor unit operates normally.

9 times Lighted Inverter check mode

The unit is operated with emergency operation switch.

—

Lighted Lighted Normal

——

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

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

OFF

2.5-second OFF

0.5-second ON

LED1

LED2

Lighted

Outdoor control P.C. board (Parts side)

OBH626H

135

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-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2

MXZ-3D68VA MXZ-4D72VA

MXZ-4D83VA MXZ-5D102VA

MXZ-6D122VA

1.49

~ 1.84 0.86 ~ 1.06 0.63 ~ 0.78 1.29 ~ 1.49 0.77 ~ 0.95

Outdoor fan motor

WHT

RED BLK

MXZ-2D33VA/40VA/42VA/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/3D54VA2/3D68VA/4D72VA/6D122VA

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-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-4D83VA MXZ-5D102VA

MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA

MXZ-6D122VA

1.2 k

~ 1.56 k 1.26 k ~ 1.62 k 1.24 k ~ 1.86 k

Linear expansion valve

LEV

WHT

RED

YLW

ORN

BLU

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-3D54VA2-E3,

ER3, ET3

MXZ-3D68VA/4D72VA MXZ-4D83VA/5D102VA MXZ-6D122VA

Pressure

Normal

HPS

MXZ-3D54VA2-E3,

ER3, ET3

MXZ-3D68VA-E3,

ER3, ET3

MXZ-4D72VA-E3,

ER3, ET3

MXZ-3D68VA-E1,

ER2, ET2

MXZ-4D72VA-E1,

ER2, ET2

MXZ-4D83VA/5D102VA

MXZ-6D122VA

3.43 0.15 MPa 3.7 0.3 MPa 3.43 0.15 MPa Close

4.41

0.1 MPa 4.8 0.2 MPa 4.41 0.1 MPa Open

Defrost heater

MXZ-2D53VAH

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

Normal

349

~ 428

WHT

RED

BLK

11-5. TROUBLE CRITERION OF MAIN PARTS

MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA MXZ-6D122VA

OBH626H

136

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 power supply.

Yes

Check the main power supply circuit for proper connections.

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

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

Check the power supply and correct them.

Replace the outdoor display P.C. board.

Replace the inverter P.C. board.

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

Replace the reactor.

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

Replace the inverter P.C. board.

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

Check the connected 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/2D42VA/2D53VA/2D53VAH

OBH626H

137

MXZ-3D54VA/3D54VA2/3D68VA/4D72VA/4D83VA/5D102VA

MXZ-6D122VA

Check the main power supply circuit for proper connections.

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

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

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

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 230 VAC?

Replace the reactor.

Turn ON the power supply.

Yes

Replace the outdoor power P.C. board.

Turn ON the power supply.

Yes

Check the main power supply circuit for proper connections.

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

Is the output voltage from the outdoor power P.C. board 325 VDC?

Check the power supply cable.

Replace the outdoor power P.C. board.

Turn OFF the power supply and recconnect the reactor.

Is the reactor short-circuited?

Replace the reactor.

Replace the outdoor control P.C. board.

OBH626H

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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 power supply before

replacing the indoor electronic control P.C. board.

MXZ-2D33/2D40/2D42/2D53VA/2D53VAH

Refer to indoor unit service manual.

Outdoor display P.C. board

oNoN LED 1 LED 2 Unit A Unit B status status

Yes

seY

Yes

No (Lighted or not lighted)

*1 Turn OFF the power supply before replacing the indoor electronic control P.C. board. Refer to indoor unit service manual. *3 Turn OFF the power supply 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 power supply.

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 power supply.

Turn ON the power supply.

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:

3RRUFRQQHFWLRQRIWKHLQGRRU

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).

(IIHFWVRIWKHLQYHUWHUOLJKWLQJ

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.

1RLVHRQWKHLQGRRURXWGRRU

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

7KHLQGRRURXWGRRUFRQQHFWLQJZLUH

runs near the

power supply cable of

other equipment.

7KHLQGRRURXWGRRUFRQQHFWLQJZLUH

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

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

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-3D54VA2

MXZ-4D83/5D102VA

LED1 LED2

LED3

LED3 LED2

LED1

LED1 LED2

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.

MXZ-2D/3D/4D/5D

OBH626H

139

MXZ-6D122VA

Is there rated voltage in the power supply?

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

1 Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts.

(Lighted or not lighted)

Yes

Be sure to release the failure-mode recall function after checking.

Yes

Refer to indoor unit service manual.

Turn OFF the power supply.

Turn ON the power supply.

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

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

Press EMERGENCY OPERATION switch once.

Check the power supply.

Turn OFF the power supply. Check once more if the indoor/outdoor connecting wire is not miswiring.

Bridge the outdoor terminal block S2 and S3. 1

Turn ON the power supply.

Check the wiring.

Correct them.

Turn OFF the power supply. Remove the bridge between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3? <Confirmation of serial signal>

Is there rated voltage between indoor terminal block S1 and S2? <Confirmation of power voltage>

Replace the indoor electronic control P.C. board.

2 Be careful of the residual voltage of smoothing capacitor.

Replace the outdoor control P. C. board. 2

Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact to the terminal block?

Replace the indoor/outdoor connecting wire.

Is serial signal error indicated 6 minutes later?

Yes

· Turn OFF inverter-controlled lighting equipment.

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

· Press EMERGENCY OPERATION switch.

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

· Attach a filter on remote control receiving section of the indoor unit.

Is serial signal error indicated 6 minutes later?

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

LED indication for communication status

Communication status is indicated by the LED.

Blinking: normal communication Lighting: abnormal communication or not connected

Pattern 1 and 2 is repeatedly displayed alternately. Each pattern is displayed for 15 seconds.

NOTE: "Lighting" in the table below does not indicate abnormal communication.

Unit status

Outdoor control P.C. board

Blinking

LED1 LED2

LED3

LED 1 LED 3LED 2

Pattern

1 2 3

Unit B status

Unit C status

Unit A status

Unit D

status Unit E status

Not lighted

Lighted

Blinking

OBH626H

140

How to check inverter/compressor

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 power supply, 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 370 VDC 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 50 VAC - 250 VAC? * 1, * 2

Turn OFF the power supply, 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 power supply, 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

Yes

* 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.

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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

Reconnect the connector and disconnect the lead wire leading to the compressor. 3 minutes after turning ON the power supply, 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-3D54VA2

MXZ-2D30/2D40/2D42/2D53VA/2D53VAH

MXZ-4D83/5D102VA

MXZ-6D122VA

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

Symbol

RT61 RT62 RT68 RT65 RT64

Connector, Pin No. Between CNTH1 pin1 and pin2 Between CNTH1 pin3 and pin4 Between CNTH1 pin7 and pin8 Between CNTH2 pin1 and pin2 Between CN171 pin1 and pin2

Outdoor control P.C. board

Outdoor power P.C. board

Board

OBH626H

142

Check of LEV

Yes

Turn ON the power supply 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. MXZ-2D MXZ-3D/4D/5D/6D

CN724 CN725

Inverter P.C. board

Outdoor control P.C. board

CN791 CN792 CN793 CN794 CN795 CN796

―

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143

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 5 VDC and 0 VDC repeatedly?

Replace the outdoor fan motor.

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

Yes

CN931 CN932

Outdoor control P.C. board

MXZ-2D MXZ-4D83VA/5D102VA

Inverter P.C. board

MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH MXZ-4D83VA/5D102VA

OBH626H

144

MXZ-3D54VA/3D54VA2/3D68VA/4D72VA

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

15 VDC

325 VDC

1 - 5 VDC

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 0 VDC and 5 VDC?

Replace the outdoor fan motor.

Does the fan motor operate for about 5 seconds?

Replace the outdoor fan motor.

Replace the outdoor control P.C. board.

Start operation.

CN931

Outdoor control P.C. board

MXZ-3D54VA/3D54VA2/3D68VA/4D72VA

OBH626H

145

MXZ-6D122VA

Yes

Disconnect CNF1 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 CNF1.

Turn OFF the power supply and connect the connector CNF1. Turn ON the power supply and measure the voltage of connector CNF1 while rotating the motor by the hand.

Does the outdoor fan motor rotate smoothly?

Replace the outdoor fan motor.

Resistance

N

N

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

15 VDC

325 VDC

1 - 5 VDC

CNF1 pin 1 - pin 4 pin 5 - pin 4 pin 6 - pin 4

Is the voltage of connector CNF1 normal? (Refer to right table.)

Does the voltage between pin 7 and pin 4 of connector CNF1 repeat 0V and 5V?

Replace the outdoor fan motor.

Does the fan motor operate for about 5 seconds?

Replace the outdoor fan motor.

Start operation.

Replace the outdoor control P.C. board.

CNF1

Outdoor control P.C. board

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146

Check of R.V. coil

Yes

1. Disconnect the lead wire leading to the compressor.

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

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

Turn OFF the power supply. 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 power supply, start EMERGENCY OPERATION in COOL mode.

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

Replace the inverter P.C. board.

Replace the 4-way valve.

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• The cooling operation or the heating operation does not operate.

MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH

MXZ-2D

CN721 Inverter P.C. board

OBH626H

147

Yes

1. Disconnect the lead wire leading to the compressor.

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

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

Turn OFF the power supply. Disconnect the connector CN712.

Replace the 4-way valve.

Replace the outdoor control P.C. board.

Replace the R.V. coil.

Is there voltage 230 VAC 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 power supply, start EMERGENCY OPERATION in COOL mode.

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

Replace the 4-way valve.

Replace the outdoor control P.C. board.

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MXZ-3D54VA/3D54VA2/3D68VA/4D72VA

CN711 CN712

Outdoor control P.C. board

MXZ-3D54VA/3D54VA2/3D68VA/4D72VA

OBH626H

148

Yes

1. Disconnect the lead wire leading to the compressor.

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

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

Turn OFF the power supply of the indoor and the outdoor unit.

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

2. 3 minutes after turning ON the power supply, 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 12 VDC 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 power supply, start EMERGENCY OPERATION in COOL mode.

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

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

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

Replace the 4-way valve.

Replace the noise filter P.C. board.

Is there voltage 12 VDC 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.

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MXZ-4D83VA/5D102VA

CN921 Noise ﬁ lter P.C. board

OBH626H

149

MXZ-6D122VA

Yes

1. Disconnect the lead wire leading to the compressor.

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

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

Turn OFF the power supply. Disconnect the connector CNAC2.

Replace the 4-way valve.

Replace the outdoor control P.C. board.

Replace the R.V. coil.

Is there voltage 230 VAC between the pin 1 and pin 3 at connector CNAC?

Replace the outdoor power 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 power supply, start EMERGENCY OPERATION in HEAT mode.

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

Replace the 4-way valve.

Replace the outdoor control P.C. board.

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CNAC CN712

Outdoor control P.C. board

CNAC2

Outdoor power P.C. board

OBH626H

150

Check of HPS

Infinity



Yes

1. Disconnect the connector CN681/CN63H.

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 power supply 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-3D54VA2-E3,

ER3, ET3

MXZ-3D68VA/4D72VA/4D83VA/5D102VA/6D122VA

CN681

MXZ-3D54VA2-

ER3, ET3

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

Outdoor control P.C. board

CN63H

MXZ-6D122VA

Outdoor control P.C. board

OBH626H

151

Check of bus-bar voltage

•Check the voltage of power supply.

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

Blink 5 times

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

Replace the outdoor power P.C. board.

Blink 9 times

Replace the outdoor control P.C. board.

Turn OFF the power supply before removing P.C. board.

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

Turn ON the power supply. 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 outdoor power P.C. board.

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

Turn ON the power supply. Start operation.

Normal

Lighting Lighting

MXZ-3D54VA/3D54VA2/3D68VA/4D72VA MXZ-4D83VA/5D102VA

MXZ-6D122VA

•Check the voltage of power supply.

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

Blink 5 times

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

Replace the outdoor power P.C. board.

Blink 9 times

Replace the outdoor control P.C. board.

Turn OFF the power supply before removing P.C. board.

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

Turn ON power supply. Start operation.

Lighting

Replace the outdoor control P.C. board.

Blink 9 times

Replace the outdoor power P.C. board.

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

Turn ON power supply. Start operation.

Normal

Lighting Lighting

OBH626H

152

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 outdoor refrigerant circuit

Has the operation stopped during pump down?

Was the operation started with the stop valve closed, and was it opened during operation?

Yes

The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit. Close the stop valve, and disconnect the power plug or turn the power supply OFF.

The unit occasionally stops when the stop valve is opened or closed during operation. Open the stop valve and start the cooling operation again.

Yes

The refrigerant gas amount may be 60% or less than the normal amount. Identify where the gas is leaking from, and ﬁ x the leak.

CAUTION : Do not start the opera-

tion again to prevent hazards.

OBH626H

Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Apr. 2015. No.OBH626 REVISED EDITION-H Distributed in Jan. 2015. No.OBH626 REVISED EDITION-G Distributed in Aug. 2014. No.OBH626 REVISED EDITION-F Distributed in Apr. 2014. No.OBH626 REVISED EDITION-E Distributed in Jan. 2014. No.OBH626 REVISED EDITION-D Distributed in Oct. 2013. No.OBH626 REVISED EDITION-C Distributed in Jan. 2013. No.OBH626 REVISED EDITION-B Distributed in Dec. 2012. No.OBH626 REVISED EDITION-A Distributed in Nov. 2012. No.OBH626 Made in Japan

New publication, effective Apr. 2015 Specifications are subject to change without notice.

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

Mitsubishi MXZ-2D33VA-E2, MXZ-2D33VA-ET2, MXZ-2D33VA-E3, MXZ-2D33VA-ER3, MXZ-2D33VA-ET3 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual