Mitsubishi MVZ-A24AA7, MVZ Series, MVZ-A36AA7, MVZ-A30AA7, PVA series Service Manual

Air-Conditioners

SERVICE MANUAL

Series MVZ

Model name

Model name
<Indoor unit>

<Indoor unit>

MVZ-A12AA4

MVZ-A12, 18, 24, 30, 36AA7

MVZ-A18AA4

Multi-Position Air Handler

-

M-SERIES

INDOOR UNIT

Contents

1. SAFETY PRECAUTION .....................................................................................................................................................2

1-1. Always observe for safety .........................................................................................................................................2

1-2. Cautions related to new refrigerant ...........................................................................................................................2

2. PART NAMES AND FUNCTIONS ......................................................................................................................................3

3. SPECIFICATION ................................................................................................................................................................4

4. FAN PERFORMANCE AND CORRECTED AIR FLOW .....................................................................................................6

MVZ-A12AA7 ...................................................................................................................................................................6

MVZ-A18AA7 ...................................................................................................................................................................7

MVZ-A24AA7 ...................................................................................................................................................................8

MVZ-A30AA7 ...................................................................................................................................................................9

MVZ-A36AA7 .................................................................................................................................................................10

MVZ-A12, 18, 24, 30, 36AA7 .........................................................................................................................................11

5. SOUND PRESSURE LEVELS .........................................................................................................................................12

5-1. Sound pressure level ..............................................................................................................................................12

5-2. NC curves ...............................................................................................................................................................12

6. OUTLINES & DIMENSIONS ............................................................................................................................................15

7. WIRING DIAGRAM ..........................................................................................................................................................17

8. REFRIGERANT SYSTEM DIAGRAM ..............................................................................................................................18

9. HEATER CONTROL .........................................................................................................................................................19

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9-2. Fan control ..............................................................................................................................................................21

9-3. CN24RELAY-KIT-CM3 (Optional Parts) installation ................................................................................................22

10. HUMIDIFIER CONTROL ................................................................................................................................................24

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10-2. Installation .............................................................................................................................................................24

11.

ERV (ENERGY RECOVERY VENTILATION) CONTROL .......................................................................................................................25

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12. TROUBLESHOOTING ...................................................................................................................................................26

12-1. Cautions on troubleshooting .................................................................................................................................26

12-2. Self-check function ................................................................................................................................................27

12-3. Self-diagnosis action table ....................................................................................................................................29

12-4. Troubleshooting by inferior phenomena ...............................................................................................................33

12-5. Test point diagram .................................................................................................................................................34

12-6. Trouble criterion of main parts...............................................................................................................................36

12-7. Thermistor .............................................................................................................................................................36

12-8. DC Fan motor (FAN MOTOR/INDOOR CONTROLLER BOARD) .......................................................................37

12-9. Functions of DIP switch and jumper wire ..............................................................................................................38

13. DISASSEMBLY PROCEDURE ......................................................................................................................................39

13-1. Control box ............................................................................................................................................................39

13-2. Thermistor (Return Air) ..........................................................................................................................................40

13-3. Coil Assembly........................................................................................................................................................41

13-4. Blower/Fan Assembly............................................................................................................................................43

SAFETY PRECAUTION1

1-1. Always observe for safety

Before obtaining access to terminal, all supply
circuits must be disconnected.

1-2. CAUTIONS RELATED TO NEW REFRIGERANT

1-2. Cautions related to new refrigerant

Cautions for units utilising refrigerant R410A

Use new refrigerant pipes.

In case of using the existing pipes for R22, be careful with
the followings.

· For A36 and A42, be sure to perform replacement oper-

ation before test run.

· Change flare nut to the one provided with this product.

Use a newly flared pipe.

· Avoid using thin pipes.

Make sure that the inside and outside of refrige­rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.

Contamination inside refrigerant piping can cause deterio­ration of refrigerant oil etc.

Store the piping to be used indoors during
installation and both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)

If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com­pressor.

Do not use refrigerant other than R410A.

If other refrigerant (R22 etc.) is used, chlorine in refrige­rant can cause deterioration of refrigerant oil etc.

Use a vacuum pump with a reverse flow check
valve.

Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.

Use the following tools specifically designed for
use with R410A refrigerant.

The following tools are necessary to use R410A refrigerant.

Tools for R410A
Gauge manifold
Charge hose
Gas leak detector

Torque wrench

Flare tool
Size adjustment gauge
Vacuum pump adaptor

Electronic refrigerant
charging scale

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com­pressor.

Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.

If large amount of mineral oil enters, that can cause deterio­ration of refrigerant oil etc.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigera­nt will change and the efficiency will be lowered.

Ventilate the room if refrigerant leaks during

Charge refrigerant from liquid phase of gas
cylinder.

If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.

operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

[1] Cautions for service

(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.

[2] Additional refrigerant charge

When charging directly from cylinder

· Check that cylinder for R410A on the market is syphon type.

· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

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2

Gravimeter

[3] Service tools

Use the below service tools as exclusive tools for R410A refrigerant.

No. Tool name Specifications
1 Gauge manifold

2 Charge hose

3 Electronic scale
4 Gas leak detector
5 Adaptor for reverse flow check
6 Refrigerant charge base
7 Refrigerant cylinder

8 Refrigerant recovery equipment

· Only for R410A

· Use the existing fitting specifications. (UNF1/2)

· Use high-tension side pressure of 5.3MPa·G or over.

· Only for R410A

· Use pressure performance of 5.09MPa·G or over.

· Use the detector for R134a, R407C or R410A.

· Attach on vacuum pump.

· Only for R410A · Top of cylinder (Pink)

· Cylinder with syphon

Unit

PART NAMES AND FUNCTIONS2

Indoor Unit

•

(1)Vertical

(2)Horizontal Right

Air
inlet

Air
outlet

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3

(3)Horizontal left

(4)Down flow

Air inlet

Air
outlet

SPECIFICATION3

Servi ce Ref .
Power supply (phase, cycle, voltage)

External finish
Heat exchanger

Fan

Operation control & Thermostat

INDOOR UNIT

Sound pressure level
(Low-Mid-High)

Drain pipe mm (in . )
Dime ns ions W mm (in. )

Weight

Max. Fuse Size

Min. Circuit Ampacity A

Fan (drive) x No.
Fan motor output

Fan mot or

Airflow (Low-Mid-High)
External static pressure

75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)

D mm (in. )
H mm (in. )

m

A

kW

F.L.A

3

/mi n (CF M)

Pa (in.WG)

dB ( A )

kg (lbs )

Air
inlet

Air outlet

MVZ-A12AA7

1 pha s e, 60H z, 208/230V

Galvanized steel cabinet - Powder coated Slate Gray

7.9-9.6-11.3 (280-340-400)

75-125-200 (0.30-0.50-0.80)

Remote controller & built-in

15

3.00

Plate n coil

Sirocco fan

19.05 (3/4) FPT

1275 (50-1/4)

x 1

0.121

2.4

24-28-32
27-31-35
32-36-41

432 (17)

548 (21-5/8)

51 (113)

Servi ce Ref .
Power supply (phase, cycle, voltage)

External finish
Heat exchanger

Fan

Operation control & Thermostat

INDOOR UNIT

Sound pressure level
(Low-Mid-High)

Dra in pipe mm (in. )
Dime ns ions W mm (in. )

Weight

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Max. Fuse Size
Min. Circuit A mpacity A

Fan (drive) x No.
Fan motor output

Fan mot or

Airflow (Low-Mid-High)
External static pressure

75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)

D mm (in. )
H mm (in. )

kW

F.L.A

3

/mi n (CF M)

m

Pa (in.WG)

dB ( A )

kg (lbs )

MVZ-A18AA7

A

Galvanized Steel Cabinet - Powder coated Slate Gray

1 pha s e, 60H z, 208/230V

11.6-14.1-16.6 (410-497-585)
75-125-200 (0.30-0.50-0.80)

Remote controller & built-in

15

3.00

Plate n coil

Sirocco fan

19.05 (3/4) FPT

1275 (50-1/4)

x 1

0.121

2.4

26-30-34
28-32-36
33-37-41

432 (17)

548 (21-5/8)

51 (113)

4

Servi ce Ref .
Power supply (phase, cycle, voltage)

External finish
Heat exchanger

Fan

Operation control & Thermostat

INDOOR UNIT

Sound pressure level
(Low-Mid-High)

Drain pipe mm (in . )
Dime ns ions W mm (in. )

Weight

Max. Fuse Size
Min. Circuit A mpacity A

Fan (drive) x No.
Fan motor output

Fan mot or

Airflow (Low-Mid-High)
External static pressure

75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)

D mm (in. )
H mm (in. )

3

m

/mi n (CF M)

Pa (in.WG)

dB ( A )

kg (lbs )

kW

F.L.A

MVZ-A24AA7

A

Galvanized Steel Cabinet - Powder coated Slate Gray

1 phase, 60Hz, 208/230V

14.6-17.7-20.8 (515-625-735)
75-125-200 (0.30-0.50-0.80)

Remote controller & built-in

15

3.00

Plate n coil

Sirocco fan

19.05 (3/4) FPT

1275 (50-1/4)

x 1

0.121

2.4

28-33-36
30-34-38
34-38-42

432 (17)

548 (21-5/8)

51 (113)

Servi ce Ref .
Power supply (phase, cycle, voltage)

External finish
Heat exchanger

Fan

Operation control & Thermostat

INDOOR UNIT

Sound pressure level
(Low-Mid-High)

Drain pipe mm (in . )
Dime ns ions W mm (in. )

Weight

Servi ce Ref .
Power supply (phase, cycle, voltage)

External finish
Heat exchanger

Fan

Operation control & Thermostat

INDOOR UNIT

Sound pressure level
(Low-Mid-High)

Drain pipe mm (in . )
Dime ns ions W mm (in. )

Weight

Max. Fuse Size
Min. Circuit A mpacity A

Fan (drive) x No.
Fan motor output

Fan mot or

Airflow (Low-Mid-High)
External static pressure

75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)

D mm (in. )
H mm (in. )

Max. Fuse Size
Min. Circuit A mpacity A

Fan (drive) x No.
Fan motor output

Fan mot or

Airflow (Low-Mid-High)
External static pressure

75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)

D mm (in. )
H mm (in. )

3

m

/mi n (CF M)

Pa (in.WG)

dB ( A )

kg (lbs )

3

m

/mi n (CF M)

Pa (in.WG)

dB ( A )

kg (lbs )

kW

F.L.A

kW

F.L.A

MVZ-A30AA7

A

Galvanized Steel Cabinet - Powder coated Slate Gray

1 phase, 60Hz, 208/230V

17.3-21.1-24.8 (613-744-875)
75-125-200 (0.30-0.50-0.80)

Remote controller & built-in

15

4.13

Plate n coil

Sirocco fan

19.05 (3/4) FPT

1378 (54-1/4)

x 1

0.244

3.3

30-34-38
32-36-40
35-39-43

534 (21)

548 (21-5/8)

64 (141)

MVZ-A36AA7

A

Ga lvanized Steel Cabinet - P owder coated S late Gray

1 phase, 60Hz, 208/230V

21.7-26.4-31.0 (767-931-1095)
75-125-200 (0.30-0.50-0.80)
Re m o te co n tr o ll e r & bu il t- i n

15

4.13

Plate fin coil

S irocco fan

0.244

3.3

33-37-41
35-39-43
37-41-45

19.05 (3/4) FP T
534 (21)

548 (21-5/8)

1378 (54-1/4)

64 (141)

1

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5

FAN PERFORMANCE AND CORRECTED AIR FLOW4

MVZ-A12AA4

MVZ-A12AA7

• Vertical, Horizontal Right, Horizontal Left • Downflow

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.40]

100

[0.40]

100

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.30]

[0.20]

Static pressure (Pa)[in.WG]

[0.10]

[0.60]

[0.50]

[0.40]

Static pressure (Pa)[in.WG]

[0.30]

[0.20]

75

50

Middle

High

Low

25

0

[0]

7

[247]

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

150

125

100

10

[353]

Airflow rate (m

3

/min)[cfm]

High

Middle

75

Low

50

[247]

7

10

[353]

Airflow rate (m

3

/min)[cfm]

[494]

[494]

75

[0.30]

50

[0.20]

Static pressure (Pa)[in.WG]

25

[0.10]

0

[0.60]

[0.50]

[0.40]

[0]

7

[247]

150

125

100

14

Low

10

[353]

Airflow rate (m

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

Middle

3

/min)[cfm]

High

High

[494]

14

Middle

75

[0.30]

Static pressure (Pa)[in.WG]

Low

50

[0.20]

25

[0.10]

14

[247]

7

10

[353]

Airflow rate (m

3

/min)[cfm]

[494]

14

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

225

[0.90]

200

[0.80]

175

[0.70]

150

[0.60]

Middle

Static pressure (Pa)[in.WG]

125

[0.50]

100

[0.40]

[0.30]

75

7

[247]

Low

10

[353]

Airflow rate (m

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3

/min)[cfm]

High

[494]

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

225

[0.90]

200

[0.80]

[0.70]

[0.60]

175

150

High

Middle

Static pressure (Pa)[in.WG]

125

[0.50]

100

[0.40]

75

[0.30]

14

[247]

7

Low

10

[353]

Airflow rate (m

3

/min)[cfm]

[494]

14

6

MVZ-A18AA4

MVZ-A18AA7

• Vertical, Horizontal Right, Horizontal Left • Downflow

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.40]

100

[0.40]

100

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.30]

[0.20]

Static pressure (Pa)[in.WG]

[0.10]

[0.60]

[0.50]

[0.40]

Static pressure (Pa)[in.WG]

75

50

Middle

High

Low

25

0

[0]

10

[353]

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

150

125

100

[530]

Airflow rate (m

15

3

/min)[cfm]

High

Middle

[706]

75

[0.30]

50

[0.20]

Static pressure (Pa)[in.WG]

25

[0.10]

0

[0.60]

[0.50]

[0.40]

[0]

10

[353]

150

125

100

20

Low

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

Middle

[530]

Airflow rate (m

15

3

/min)[cfm]

High

High

[706]

20

Middle

75

[0.30]

Static pressure (Pa)[in.WG]

[0.30]

[0.20]

[0.90]

[0.80]

[0.70]

[0.60]

Static pressure (Pa)[in.WG]

[0.50]

[0.40]

[0.30]

75

Low

50

10

[353]

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

225

200

175

150

15

[530]

Airflow rate (m3/min)[cfm]

High

Middle

125

100

75

10

[353]

Low

[530]

Airflow rate (m

15

3

/min)[cfm]

[706]

[706]

50

[0.20]

25

20

20

[0.10]

[0.90]

[0.80]

[0.70]

[0.60]

Static pressure (Pa)[in.WG]

[0.50]

[0.40]

[0.30]

225

200

175

150

125

100

75

Low

[353]

10

[530]

Airflow rate (m

15

3

/min)[cfm]

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

High

Middle

Low

[353]

10

[530]

Airflow rate (m

15

3

/min)[cfm]

[706]

[706]

20

20

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7

MVZ-A24AA4

MVZ-A24AA7

• Vertical, Horizontal Right, Horizontal Left • Downflow

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.40]

100

[0.40]

100

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.30]

[0.20]

Static pressure (Pa)[in.WG]

[0.10]

[0.60]

[0.50]

[0.40]

Static pressure (Pa)[in.WG]

[0.30]

[0.20]

75

50

Middle

High

Low

25

0

[0]

13

[459]

150

125

100

[530]

15

Airflow rate (m

3

/min)[cfm]

[706]

20

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

High

Middle

75

Low

50

[459]

13

[530]

15

Airflow rate (m

3

/min)[cfm]

[706]

20

[847]

[847]

75

[0.30]

50

[0.20]

Static pressure (Pa)[in.WG]

25

[0.10]

0

[0.60]

[0.50]

[0.40]

[0]

150

125

100

24

Low

[459]

13

[530]

15

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

Middle

Airflow rate (m

3

/min)[cfm]

20

[706]

High

High

[847]

24

Middle

75

[0.30]

Static pressure (Pa)[in.WG]

Low

50

[0.20]

25

24

[0.10]

[459]

13

[530]

15

Airflow rate (m

3

/min)[cfm]

20

[706]

[847]

24

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

225

[0.90]

200

[0.80]

175

[0.70]

150

[0.60]

Static pressure (Pa)[in.WG]

[0.50]

[0.40]

[0.30]

125

100

Low

75

[459]

13

[530]

15

Middle

Airflow rate (m

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3

/min)[cfm]

High

[706]

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

225

[0.90]

/min)[cfm]

High

[706]

20

[777]

22

200

[0.80]

175

[0.70]

150

[0.60]

Static pressure (Pa)[in.WG]

125

[0.50]

100

[0.40]

75

20

[777]

22

[0.30]

[459]

Low

13

[530]

15

Middle

Airflow rate (m

3

8

MVZ-A30AA4

MVZ-A30AA7

• Vertical, Horizontal Right, Horizontal Left • Downflow

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.40]

100

[0.40]

100

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.30]

[0.20]

Static pressure (Pa)[in.WG]

[0.10]

[0.60]

[0.50]

[0.40]

[0.30]

Static pressure (Pa)[in.WG]

[0.20]

75

50

Middle

High

Low

25

0

[0]

15

[530]

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

150

125

100

20

[706]

Airflow rate (m

3

/min)[cfm]

[883]

High

Middle

75

50

Low

3

/min)[cfm]

High

High

[883]

25

29

[1024]

75

[0.30]

50

[0.20]

Static pressure (Pa)[in.WG]

25

[0.10]

0

[0.60]

[0.50]

[0.40]

[0]

[530]

150

125

100

25

29

[1024]

Low

15

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

Middle

20

[706]

Airflow rate (m

Middle

75

[0.30]

Static pressure (Pa)[in.WG]

Low

50

[0.20]

25

[0.10]

15

[530]

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

225

[0.90]

200

[0.80]

175

[0.70]

150

[0.60]

20

[706]

Airflow rate (m

Middle

Static pressure (Pa)[in.WG]

125

[0.50]

100

[0.40]

[0.30]

75

[530]

Low

15

20

[706]

Airflow rate (m

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3

/min)[cfm]

3

/min)[cfm]

High

[883]

[883]

25

[0.10]

[0.90]

[0.80]

[0.70]

[0.60]

Static pressure (Pa)[in.WG]

[0.50]

[0.40]

[0.30]

15

[530]

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

225

200

175

150

125

100

75

[530]

Low

15

25

25

29

[1024]

29

[1024]

20

[706]

Airflow rate (m

Middle

20

[706]

Airflow rate (m

3

/min)[cfm]

3

/min)[cfm]

High

[883]

25

[883]

28

[989]

27

25

[953]

9

MVZ-A36AA4

MVZ-A36AA7

• Vertical, Horizontal Right, Horizontal Left • Downflow

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.40]

100

[0.50]

125

External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz

[0.30]

[0.20]

Static pressure (Pa)[in.WG]

[0.10]

[0.60]

[0.50]

[0.40]

Static pressure (Pa)[in.WG]

[0.30]

75

Middle

50

Low

25

0

[0]

19

20

[671]

[706]

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

150

125

100

25

[883]

Airflow rate (m

3

/min)[cfm]

Middle

75

Low

High

High

30

[1059]

33

[1165]

[0.40]

[0.30]

[0.20]

Static pressure (Pa)[in.WG]

[0.10]

[0.70]

[0.60]

[0.50]

[0.40]

Static pressure (Pa)[in.WG]

[0.30]

[0.20]

100

75

Middle

50

Low

25

0

[0]

19

20

[671]

[706]

External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz

175

150

125

100

75

25

[883]

Airflow rate (m3/min)[cfm]

Middle

Low

50

High

High

30

[1059]

32

[1130]

50

[0.20]

[0.90]

[0.80]

[0.70]

[0.60]

Static pressure (Pa)[in.WG]

[0.50]

[0.40]

[0.30]

19

20

[671]

[706]

External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

225

200

175

150

125

100

75

[671]

Low

19

20

[706]

25

[883]

Airflow rate (m

Middle

25

[883]

Airflow rate (m

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3

/min)[cfm]

3

/min)[cfm]

High

30

[1059]

30

[1059]

32

[1130]

32

[1130]

10

[0.10]

[0.80]

[0.70]

[0.60]

[0.50]

Static pressure (Pa)[in.WG]

[0.40]

[0.30]

[0.20]

25

19

20

[671]

[706]

External static pressure 0.60 [in.WG] (150Pa) 208/230V 60Hz

200

175

150

125

25

[883]

Airflow rate (m

3

/min)[cfm]

Middle

100

75

Low

50

[671]

19

20

[706]

25

[883]

Airflow rate (m

3

/min)[cfm]

High

30

[1059]

30

[1059]

32

[1130]

32

[1130]

MVZ-A12, 18, 24, 30, 36AA4

A

MVZ-A12, 18, 24, 30, 36AA7

ir filter

Power source:208/230V 60Hz

25

[0.100]

20

[0.080]

15

[0.060]

10

[0.040]

External static pressure (Pa)[in.WG]

5

[0.020]

0

[0]

0

[0]

[353]

10

A12,18,24A12,18,24

20

[706]

Airflow rate (m3/min)[cfm]

[1059]

A30,36

A30,36

30

40

[1412]

50

[1766]

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11

SOUND PRESSURE LEVELS5

5-1. Sound pressure level

Multi-Position

5-2. NC curves

MVZ-A12AA7 MVZ-A18AA7

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12

MVZ-A24AA7

MVZ-A30AA7

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13

MVZ-A36AA7

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14

6 OUTLINES & DIMENSIONS

INDOOR UNIT

MVZ-A12, 18, 24, 30, 36AA7

Unit:mm(in.)

548(21-5/8)

Note 1.Keep the service space for maintenance at the front.

ø26 Knockout Hole

(Remote controller transmission)

28.8(1-3/16)

(Duct)

402(15-7/8)

117.4 (4-5/8)

Top

view

Front

24(15/16)

13.2(9/16)

Terminal block

76(3)

transmission)

ø26 Knockout Hole

(Remote controller

E

55(2-3/16)

Secondary drain pipe

(Emergency draining)

Control box

43(1-3/4)

Primary drain pipe

Terminal block

(Indoor / Outdoor unit connection)

(Remote controller transmission)

(Gravity drain)

ø19.05(3/4) 3/4"FPT

ø19.05(3/4) 3/4"FPT

F

8(3/8)

Primary drain pipe

(Gravity drain)

ø19.05(3/4) 3/4"FPT

(Horizontal Right)

D

view

Right side

Bottom

525.5(20-3/4)

50.8(2)

477X402

376X402

Duct Connection

(14-13/16X15-7/8)

(20X16X1)

508X508X25.4

508X406.4X25.4

Nominal Filter Size

3

Model

MVZ-A18AA7

MVZ-A24AA7

MVZ-A12AA7

MVZ-A30AA7

470(18-9/16)

6.35

ø

Liquid pipe

36.8(1-1/2)

12.7

ø

Gas pipe

1 2

(18-13/16X15-7/8)

(20X20X1)

MVZ-A36AA7

9.52

(1/4)

(3/8)

ø

(1/2)

(5/8)

15.88

ø

C

B(Duct)

Air outlet

Top

view

connection)

ø26 Knockout Hole

(Indoor / Outdoor unit

Secondary drain pipe

(Emergency draining)

2-ø4.6 Burring Holes

for electric heat installation

flare connection(gas)

Refrigerant piping

1

ø19.05(3/4) 3/4"FPT

flare connection(liquid)

Refrigerant piping

2

ø26 Knockout Hole

unit connection)

(Indoor / Outdoor

8(3/8)

ø19.05(3/4) 3/4"FPT

(Gravity drain)

(Horizontal left)

Primary drain pipe

55(2-3/16)
70(2-13/16)

77.8(3-1/8)

66(2-5/8)

8(3/8)

30(1-3/16)

43(1-3/4)

92(3-5/8)

55(2-3/16)

ø19.05(3/4) 3/4"FPT

Secondary drain pipe

(Emergency draining)

H

G

Air inlet

A

view

Left side

Air filter

3

Bottom

J

view

360

(14-3/16)

(29)

735.5

823

(32-7/16)

680

(26-13/16)

1275

(50-1/4)

224

(8-7/8)

281

(11-1/8)

376

(14-13/16)

432

(17)

461

(18-3/16)

792

(31-3/16)

953.5

(37-9/16)

737

(29-1/16)

1378

(54-1/4)

266.5

(10-1/2)

382.6

(15-1/8)

477

(18-13/16)

(21)

534

Model A B C D E F G H J

MVZ-A18AA7

MVZ-A24AA7

MVZ-A36AA7

MVZ-A12AA7

MVZ-A30AA7

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15

Unit:mm(in.)

609.6(24)

609.6(24)

Length of Unit

Horizontal Installation

Clearance Area

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609.6(24)

16

609.6(24)

Width of Unit

Vertical Installation

7 WIRING DIAGRAM

MVZ-A18AA4

M

4

MVZ-A30AA4

MVZ-A36AA4

MVZ-A12, 18, 24, 30, 36AA7

1

SW1

(BLUE)
CN3C

3

SW2

CN90

1
2
3
4
5
6
7
8
9

(GREEN)

CNF

123456789

CN1

LED1

BZ1

RU

SW2SW1

W.B .

OPTIONAL PARTS

SYMBOL EXPLANATION

SYMBOL
I.B.

CN24-1
CN24-2
CN25
CN2A
CN2C
CN2L
CN32
CN41
CN51
CN90
CN105
CNER
CNF
LED1
LED2
LED3

t˚

INDOOR CONTROLLER BOARD

CONNECTOR (HEATER CONTROL 1ST)
CONNECTOR (HEATER CONTROL 2ND)
CONNECTOR (HUMIDITY OUTPUT)
CONNECTOR (0-10V ANALOG INPUT)
CONNECTOR (ERV OUTPUT)
CONNECTOR (LOSSNAY)
CONNECTOR (REMOTE SWITCH)
CONNECTOR (HA TERMINAL-A)
CONNECTOR (CENTRALLY CONTROL)
CONNECTOR (WIRELESS)
CONNECTOR (RADIO FREQUENCY INTERFACE)
CONNECTOR (ERV INPUT)
CONNECTOR (HUMIDITY INPUT)

LED(POWER SUPPLY)
LED(REMOTE CONTROLLER SUPPLY)
LED(TRANSMISSION INDOOR-OUTDOOR)

TH2

NAME

OFF

ON

SW5

LED3

CN44

CN4F

1

1

2

2

3

3

4

4

t˚

t˚

TH5

TH1

SWE

(BLACK)

CN2C

(RED)

(YELLOW)

CN20

CN24-1

1
2

SYMBOL NAME

I.B.

SW1
SW2
SW5
SWE

P. B .

F01
ZNR01,02
DSA
X10

TH1
TH2
TH5

TB4

TB15

RFI

CN32

CN41

(RED)
CNER

(BLUE)
CN24-2

(RED)

CN2L

INDOOR CONTROLLER BOARD
SWITCH (FOR MODEL SELECTION)
SWITCH (FOR CAPACITY CODE)
SWITCH (FOR MODE SELECTION)
CONNECTOR (EMERGENCY OPERATION)
POWER SUPPLY BOARD
FUSE AC250V 6.3A
VARISTOR
ARRESTOR
AUX.RELAY

INTAKE AIR TEMP. THERMISTOR
PIPE TEMP
COND

.

/EVA.TEMP. THERMISTOR

TERMINAL BLOCK
(INDOOR/OUTDOOR CONNECTING LINE)

TERMINAL BLOCK
(REMOTE CONTROLLER TRANSMISSION LINE)

(RED)

CN105

LED2

(BLACK)

CN2A

CN25

(BLUE)

CN22

CN51

CNXB2

LED1

1
2

CNXC2

3
451

2

.

THERMISTOR/LIQUID

RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT

I.B.

2
1

(BLUE)
CNXA2

1
2
3
4

5
4
3
2
1

RFI

OPTIONAL PARTS

W.B .

R.B.

INSIDE SECTION OF CONTROL BOX

153

DSA

U

ZNR01

ZNR02

U

(BLUE)

CNXB1

4123

IR WIRELESS REMOTE CONTROLLER BOARD

RU

RECEIVING UNIT

BZ1

BUZZER

LED1

LED(RUN INDICATOR)

SW1

SWITCH(HEATING ON/OFF)

SW2

SWITCH(COOLING ON/OFF)
WIRED REMOTE CONTROLLER BOARD
TERMINAL BLOCK

TB6

(REMOTE CONTROLLER TRANSMISSION LINE)

CNXA1 CNMFCNXC1

5

12

NAMESYMBOL

F01

(RED)
CND

X10

321

4

P. B .

DC280-340V
RECTIFIER CIRCUIT

MS
3~

FAN MOTOR

TRANSMISSION

WIRES DC 12V

TB15

1

2

TB4

S1
S2

S3

MODEL

MODEL

MVZ-A12AA4

MVZ-A12AA7

17654

MVZ-A18AA4

MVZ-A18AA7

MVZ-A24AA4

VZ-A24AA

MVZ-A24AA7

MVZ-A30AA4

MVZ-A30AA7

MVZ-A36AA4

MVZ-A36AA7

Note1.Since the outdoor side electric wiring may change

to check the outdoor unit electric wiring for

2.Indoor and outdoor connecting wires are made with

polarities,make wiring matching terminal numbers
(S1,S2,S3).

3.Symbols used in wiring diagram above are as
:CONNECTOR

:TERMINAL
(HEAVY DOTTED LINE):FIELD WIRING
(THIN DOTTED LINE):OPTIONAL PARTS

4.Use copper supply wire.

UTILISER DES FILS D'ALIMENTATION EN CUIVRE.

TB6

1
2

R.B.

REMOTE CONTROLLER

OPTIONAL PARTS

TO OUTDOOR UNIT

SWITCH

SWITCH

ON

ON

ON

ON

1

1

ON

ON

SW2 SW2

SW2 SW2

ON

ON

1

1

ON

ON

ON

ON

SW2 SW2 SW2

SW2 SW2 SW2

12345

12345

554433221

554433221

554433221

554433221

ON

SW5

SW5

ON

ON

SW5

SW5

ON

ON

SW5

SW5

ON

ON

ON

ON

SW5 SW5

SW5 SW5

servicing.

SW1

ON

SW1

ON

SW1

ON

SW1

ON

SW1

ON

SW1

54321

54321

ON

SW1

54321

54321

ON

SW1

54321

54321

ON

SW1

54321

54321

ON

SW1

54321

54321

follows.

54321687

54321687

54321687

54321687

54321687

54321687

54321687

54321687

54321687

54321687

be sure

SYMBOL
I.B.

CN24-1
CN24-2
CN25
CN2A
CN2C
CN2L
CN32
CN41
CN51
CN90
CN105
CNER
CNF
LED1
LED2
LED3

INDOOR CONTROLLER BOARD
CONNECTOR (HEATER CONTROL 1ST)
CONNECTOR (HEATER CONTROL 2ND)
CONNECTOR (HUMIDITY OUTPUT)
CONNECTOR (0-10V ANALOG INPUT)
CONNECTOR (ERV OUTPUT)
CONNECTOR (LOSSNAY)
CONNECTOR (REMOTE SWITCH)
CONNECTOR (HA TERMINAL-A)
CONNECTOR (CENTRALLY CONTROL)
CONNECTOR (WIRELESS)
CONNECTOR (RADIO FREQUENCY INTERFACE)
CONNECTOR (ERV INPUT)
CONNECTOR (HUMIDITY INPUT)
LED(POWER SUPPLY)
LED(REMOTE CONTROLLER SUPPLY)
LED(TRANSMISSION INDOOR-OUTDOOR)

NAME

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SYMBOL NAME
I.B.

P. B .

INDOOR CONTROLLER BOARD

SW1

SWITCH (FOR MODEL SELECTION)

SW2

SWITCH (FOR CAPACITY CODE)

SW5

SWITCH (FOR MODE SELECTION)

SWE

CONNECTOR (EMERGENCY OPERATION)
POWER SUPPLY BOARD

F01

FUSE AC250V 6.3A

ZNR01,02

VARISTOR

DSA

ARRESTOR

X10

AUX.RELAY

TH1

INTAKE AIR TEMP. THERMISTOR

TH2

PIPE TEMP

TH5

COND
TERMINAL BLOCK

TB4

(INDOOR/OUTDOOR CONNECTING LINE)

TERMINAL BLOCK

TB15

(REMOTE CONTROLLER TRANSMISSION LINE)

RFI

RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT

.

THERMISTOR/LIQUID

.

/EVA.TEMP. THERMISTOR

17

OPTIONAL PARTS

W.B .

IR WIRELESS REMOTE CONTROLLER BOARD

RU

RECEIVING UNIT

BZ1

BUZZER

LED1

LED(RUN INDICATOR)

SW1

SWITCH(HEATING ON/OFF)

SW2

SWITCH(COOLING ON/OFF)

R.B.

WIRED REMOTE CONTROLLER BOARD
TERMINAL BLOCK

TB6

(REMOTE CONTROLLER TRANSMISSION LINE)

NAMESYMBOL

8 REFRIGERANT SYSTEM DIAGRAM

MVZ-A12, 18, 24, 30, 36AA7

Strainer (#50)

Heat exchanger

Refrigerant GAS pipe connection
(Flare)

Thermistor TH5
(Cond./ Eva.temperature)

Thermistor TH2
Pipe temperature(Liquid)

Refrigerant LIQUID pipe connection
(Flare)

Thermistor TH1
(Room temperature)

Distributor
with strainer (#50)

Strainer (#50)

Refrigerant flow in cooling
Refrigerant flow in heating

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18

9 HEATER CONTROL

9-1. Control Specifications And Function Setting

• Table 1 shows the mode setting for the field-installed heater.
Table. 1 [Function Table]

Select unit numbers 01 to 03 or all units (AL [wired remote controller] / 07 [IR wireless remote controller])

Mode (function ) No.

Wired remote controller

(RF thermostat)

11 (111) 23 (123)

11 Ɣ No Heater Present

21 ņ

22 ņ

*1

Heater will not operate during all error modes. Heater will only operate during a communication error between indoor unit and

outdoor unit.

Factory Setting Mode

Heater Available

Disable heater during

Defrost and Error

Heater Available

Enable heater and fan

during Defrost and

Error

*1

• Table 2 shows how the field-installed heater is controlled.

Heater Operation In

Error

OFF OFF High

ON ON High

Heater Operation

During Defrost

Fan Control When

Heater ON

Table. 2 [Heater Control Table]

Condition

AND

TRA has not

increased by

0.9 °F [0.5°
C] in X min

EH1 ON for

> 7 min

AND

) >

Mode Change

EH1 ON ż AND ż
EH2 ON ż AND ż AND ż
EH1 OFF ż
EH2 OFF ż
KEY

• EH1: Electric Heater 1

• EH2: Electric Heater 2

• To: Set point temperature
: Return Air temperature

• T

RA

• X: Time delay (Selectable. Default is 24 min. Selectable to 14, 19, or 29 min)

(To -T

2.7 ° F

[1.5 °C]

RA

(To -T

2.7 ° F

[1.5 ° C]

RA

) >

AND

TRA has not
increased by 0.9 °
F [0.5° C] in 7 min

(To -TRA) <

0.9 °F

[0.5° C]

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19

• Table 3 shows how the time delay is selected
Table. 3 [Time Delay Selection Table]

Request Code

390 Monitor Time Delay Setting
391
392
393
394

*1

Time delay can only be selected with MA controller. If use of a non-MA controller is desired, the time delay must first be

selected with the MA controller. Then the non-MA controller can be attached and used.
*2

The default time delay setting is 24 minutes.

*3

All delay times are approximate.

*1

Set Time Delay to 14 minutes
Set Time Delay to 19 minutes
Set Time Delay to 24 minutes
Set Time Delay to 29 minutes

Action

*3

*2

• Chart 1 and Table 4 show an example of heater operation.
Chart 1 [Heater Operation Example]

T

o

- 0.9 °F [0.5 °C]

T

o

- 2.7 °F [1.5 °C]

T

o

༃

༄

༅

༃

༄

༅

༆

༇

༈

T

RA

> 7
min

EH1

EH2

X min X min X min

ON

OFF

ON

OFF

Table. 4 [Heater Operation Example]

Step Condition Result

༃

(To -TRA) > 2.7 °F [1.5 °C] AND

(To -TRA) < 2.7 °F [1.5 °C] AND TRA increasing faster than 0.9 °F [0.5°C] in 7 min EH2 not ON

༄

(To -TRA) < 0.9 °F [0.5°C] EH1 OFF

༅

༆

(To -TRA) > 2.7 °F [1.5 °C] AND

(To -TRA) > 2.7 °F [1.5 °C] AND TRA not increasing faster than 0.9 °F [0.5°C] in 7 min EH2 ON

༇

(To -TRA) < 0.9 °F [0.5°C]

༈

TRA has not increased by 0.9 °F [0.5°C] in X min EH1 ON

TRA has not increased by 0.9 °F [0.5°C] in X min EH1 ON

EH1 OFF
EH2 OFF

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20

9-2. Fan control

By setting the Mode No. 23 in the Function Table in section 9-1 and using CN4Y from the CN24RELAY-KIT-CM3 kit, the
following patters of fan control will become possible.

Fan Control Patterns

CN4Y for FAN control
(CN24RELAY-KIT-CM3)

Enabled

Mode (function)
No. 23 (123)

1 OFF STOP Set (Heater ON) Ɣ
2 ON STOP High*2 (Heater ON) ņ

Heater operation in
defrost and error *1

Fan operation in
defrost and error

*1 Heater will not operate during all error modes. Heater will only operate during a communication error between indoor unit and
outdoor unit
*2 While the heater is on, the fan will operate at high speed regardless of the fan setting on the remote controller.

* If a heater is installed in the duct, do not use CN4Y. By doing so, the fan will turn off when the heater is on,
which may result in fire.

Fan Speed Setting *3

Mode

Heating Thermo-OFF DEFROST or ERROR

Setting

Very Low Very Low 25 1

Fan Control

STOP Remote Controller Setting 25 2 -

Remote Controller Setting Remote Controller Setting 25 3 -

*3 Refer to the Installation Manual for function settings.

Fan (All modes
other than defrost
and error)

Factory Setting

Mode No. Setting Initial Setting

ż

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9-3. CN24RELAY-KIT-CM3 (Optional Parts) installation

The following section describes installation of the External Heater Adapter that connects to MVZ-A AA7
series indoor unit. This products is the special wiring parts to drive an electric heater with the air conditioner.

(1) Parts list

Check that the following parts are included in the package.

1) External output cable..................................................................... 2 in total

Two types of cables with different connectors are included.

2) Panel heater connector.................................................................. 3 in total

White: 3

3) Relay

(2) Connection to the indoor unit

Use the cables that fit the connectors on the indoor unit control board.

1) External output cable
This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater.
Select the heater output pattern (1st = CN24-1 or 2nd = CN24-2) to use, and connect the cable to the connector
on the indoor unit control board that corresponds to the selection.

2) Panel heater connector
This connector is used to perform an interlocked operation with a panel heater. Depending on the indoor unit control board
specification, connect the cable to CN4Y as appropriate.

CN4Y for FAN control
(CN24RELAY-KIT-CM3)

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22

yy y

(3) Wiring

A basic connection method is shown below.

Remote control board Relay circuit

Electric Heater

power source

Electric Heater
or panel
heater

Preparations in the field

X

X

Adapter

Red 1

White 2

White 1

(applicable only when a panel
heater is connected)

Maximum cable length
is 10 m (32ft)

The length of the electrical wiring for the CN24RELAY-KIT-CM3 is 2 meters (6-1/2 ft.)

To extend this length, use sheathed 2-core cable.
Control cable type: CVV, CVS, CPEV or equivalent.
Cable size: 0.5 mm

2

~ 1.25 mm2 (16 to 22 AWG)

Don't extend the cable more than 10 meters (32ft)

Indoor unit
control board

CN24

White

CN4Y

White

3

Recommended circuit

Wiring diagram

1-phase
power supply

208V, 230V/60Hz

R

S

R

S

Control board

88H

88H

88H

CN24-1 or CN24-2

FS1

FS2
FS1

FS2

H1

H2

26H

(4) Wiring restrictions

Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters (32ft).

Longer than 10 meters (32ft) could cause improper operation.

Use a transit relay when extending wiring such as remote wiring.

FS1, 2 ----- Thermal fuse

H1, H2 ----- Heater

26H --------- Overheat

88H --------- Electromagnetic contactor

protection thermostat

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10

g

g

HUMIDIFIER CONTROL

10-1. Control Specifications

The below table shows how the field installed humidifier and fan speed is controlled.

Mode (function) No.
Wired remote controller

(RF thermostat)
13 (113) 16 (116)

2

- - Except for heat operation OFF RC settin
RC:Remote controller
The fan continues to run for 30 seconds after the humidifier stops.

1

2

Humidistat
output

CNF input
OFF Heat operation & Thermo OFF OFF RC setting

ON Heat operation & Thermo OFF OFF RC settin

OFF Heat operation & Thermo OFF OFF RC setting

ON Heat operation & Thermo OFF ON High

Condition (no defrost/no error)

Heat operation & Thermo ON

Heat operation & Thermo ON ON High

Heat operation & Thermo ON

Heat operation & Thermo ON

CN25 output

Fan speed

10-2. Installation

A basic connection method is shown below.

Indoor unit
control board

Humidifier

power source

SVA

Humidifier

On-site preparation
Maximum cable length is 10m(32ft)

XA

CN25

XA

CNF

Humidistat

Use XA relay having following specifications

Rated voltage:12VDC
Power consumption:1W or less

Humidistat:Minimum applicable load 1mA at DC

Contact rating voltage:15VDC or more
Contact rating current:0.1A or more

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11

ERV (ENERGY RECOVERY VENTILATION) CONTROL

11-1. Control Specifications

The below table shows how the field installed ERV is controlled.

ERV output C ondition Fan speed CN2C output
CNER input

OFF Cool/Heat/Fan operation R C setting O N

Defrost S T OP O F F
S TOP S TOP OF F

ON C ool/Heat/F an opera tion R C s etting O N

Defrost S T OP O F F
S TOP ON

STOP

(=Fan output)

11-2. INSTALLATION

A basic connection method is shown below.

Indoor unit
control board

CN2C

ERV

power source

XF

XB

ERV

On-site preparation
Maximum cable length is 10m(32ft)

XB

CNER

ERV switch

Use XB relay having following specifications
Rated voltage:12VDC
Power consumption:1W or less
ERV switch:Minimum applicable load 1mA at DC

Contact rating voltage:15VDC or more
Contact rating current:0.1A or more

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12

TROUBLESHOOTING

12-1. Cautions on troubleshooting

(1) Before troubleshooting, check the followings:

1 Check the power supply voltage.
2 Check the indoor/outdoor connecting wire for mis-wiring.

(2) Take care the followings during servicing.

1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn
off the breaker.
2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
components.
3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wires

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12-2. Self-check function

• Refer to the installation manual that comes with each remote controller for details.

• RF thermostat is not established.

[Output pattern A] Errors detected by indoor unit

IR wireless remote controller

Beeper sounds/OPERATION

INDICATOR lamp flashes

(Number of times)

1
2
3
4
5
6
7
8

9
10
11
12

No sound

[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)

IR wireless remote controller

Beeper sounds/OPERATION

INDICATOR lamp flashes

(Number of times)

1

2

3

4

5

6

7

8

9
10

11

12
13
14

*1 If the beeper does not sound again after the initial two beeps to confirm the self-check start signal was received and the OPERATION INDICATOR lamp does not

come on, there are no error records.

*2 If the beeper sounds three times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial two beeps to confirm the self-check start signal was

received, the specified refrigerant address is incorrect.

• On IR wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp

• On wired remote controller
Check code displayed on the LCD.

Wired remote controller

RF thermostat

Check code

P1
P2, P9
E6, E7
P4
P5
P6
EE
P8
E4
–
–
Fb
– –

Wired remote controller

RF thermostat

Check code

E9
UP
U3, U4
UF
U2
U1, Ud
U5
U8
U6
U7

U9, UH

–
–
Others

Intake sensor error
Pipe (Liquid or 2-phase pipe) sensor error
Indoor/outdoor unit communication error
Drain sensor error
Drain pump error
Freezing/Overheating safeguard operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller signal receiving error
–
–
Indoor unit control system error (memory error, etc.)
No corresponding

Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C worked/ insufficient refrigerant
Abnormal high pressure (63H worked)/ Overheating safeguard operation
Abnormal temperature of heat sink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality of super heat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and abnormal
synchronous signal to main circuit/Current sensor error
–
–
Other errors (Refer to the technical manual for the outdoor unit.)

Symptom

Symptom Remark

For details, check the LED
display of the outdoor controller
board.

Remark

• If the unit cannot be operated properly after the above test run has been performed, refer to the following table to remove the cause.

PLEASE WAIT

PLEASE WAIT →Error code

Display messages do not appear
even when operation switch is
turned ON (operation lamp does
not light up).

On the IR wireless remote controller with conditions above, following phenomena takes place.

• No signals from the remote controller are accepted.

• OPE lamp is blinking.

• The buzzer makes a short ping sound.

Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

For about 2 minutes

following power-on

After about 2 min­utes has expired

following power-on

Symptom

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LED 1, 2 (PCB in outdoor unit)Wired remote controller
After LED 1, 2 are lighted, LED 2 is turned
off, then only LED 1 is lighted. (Correct
operation)

Only LED 1 is lighted. → LED 1, 2 blink.

Only LED 1 is lighted. → LED 1, 2 blinks
twice, LED 2 blinks once.

27

Cause

• For about 2 minutes after power-on, operation of the
remote controller is not possible due to system start-up.
(Correct operation)

• Connector for the outdoor unit’s protection device is not
connected.

• Reverse or open phase wiring for the outdoor unit’s power
terminal block (L1, L2, L3)

• Incorrect wiring between indoor and outdoor units
(incorrect polarity of S1, S2, S3)

• Remote controller wire short

For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.

LED 1 (power for microcomputer)

LED 2 (power for remote controller)

LED 3 (communication between indoor and outdoor units)

Indicates whether control power is supplied. Make sure that this LED is always lit.

Indicates whether power is supplied to the remote controller. This LED lights only in the case of

the indoor unit which is connected to the outdoor unit refrigerant address “0”.

Indicates state of communication between the indoor and outdoor units. Make sure that this LED is

always blinking.

AUTO RESTART FUNCTION

Indoor controller board

This model is equipped with the AUTO RESTART FUNCTION.
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor controller board.
The auto restart function sets to work the moment the power has restored after power failure, then, the unit will restart automatically.
Set the AUTO RESTART FUNCTION using the wireless remote controller. (Mode no.1).

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12-3. Self-diagnosis action table

Error Code

P1

Abnormal point and detection method

Room temperature
thermistor (TH1)

1 The unit is in three-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the

unit does not reset normally after three
minutes. (The unit returns to normal

operation, if it has normally reset.)
2 Constantly detected during cooling,
drying and heating operation

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Note: Refer to the manual of outdoor unit for the details of display
such as F, U, and other E.

1 Defective thermistor
characteristics
2 Contact failure of connector

(CN20) on the indoor controller

board (Insert failure)
3 Breaking of wire or contact
failure of thermistor wiring
4 Defective indoor controller

board

Cause

Countermeasure

1–3 Check resistance value of thermistor.
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10:>Û)@N"
20:>Û)@N"
30:>Û)@N"
40:>Û)@N"
If you put force on (draw or bend) the lead wire
with measuring resistance value of thermistor
breaking of wire or contact failure can be
detected.
2 Check contact failure of connector (CN20) on

the indoor controller board. Refer to 12-5.
Turn the power on again and check restart
after inserting connector again.

4 Check room temperature display on remote

controller.

Replace indoor controller board if there is

abnormal difference with actual room

temperature.
Turn the power off, and on again to operate

after check.

P2

Pipe temperature
thermistor/Liquid (TH2)

1 The unit is in three-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the

unit does not reset normally after three
minutes. (The unit returns to normal

operation, if it has normally reset.)
2 Constantly detected during cooling,
drying, and heating (except defrosting)

operation.

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Contact failure of drain float switch (CN4F)

1 Extract when the connector of drain float

switch is disconnected.
(3 and 4 of connector CN4F is not

short-circuited.)
2 Constantly detected during operation.

1 Defective thermistor
characteristics
2 Contact failure of connector

(CN44) on the indoor controller

board (Insert failure)
3 Breaking of wire or contact
failure of thermistor wiring
4 Defective refrigerant circuit is

causing thermistor temperature

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5 Defective indoor controller board

1 Contact failure of connector
(Insert failure)

2 Defective indoor controller

board

1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2 Check contact failure of connector (CN44) on

the indoor controller board. Refer to 12-5.
Turn the power on again and check restart
after inserting connector again.

4 Check pipe <liquid> temperature with remote

controller in test run mode. If pipe <liquid>
temperature is extremely low (in cooling
mode) or high (in heating mode), refrigerant
circuit may have defective.

5 Check pipe <liquid> temperature with remote

controller in test run mode. If there is extreme
difference with actual pipe <liquid> temperature,
replace indoor controller board.

Turn the power off, and on again to operate
after check.

1 Check contact failure of float switch connec-

tor.

Turn the power on again and check after

inserting connector again.

2 Operate with connector (CN4F) short-circuit-

ed.
Refer to 12-5. Replace indoor controller
board if abnormality reappears.

P4

(5701)

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Error Code

P6

Abnormal point and detection method

Freezing/overheating protection is
working

1 Freezing protection (Cooling mode)

The unit is in six-minute resume preven­tion mode if pipe <liquid or condenser/
evaporator> temperature stays under

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compressor started. Abnormal if it stays
under -15:>Û)@IRUWKUHHPLQXWHVDJDLQ
within 16 minutes after six-minute
resume prevention mode.

2 Overheating protection (Heating mode)

The units is in six-minute resume
prevention mode if pipe <Liquid or con­denser / evaporator> temperature is
detected as over 70:>Û)@DIWHUWKH
compressor started. Abnormal if the
temperature of over 70:>Û)@LV
detected again within 10 minutes after
six-minute resume prevention mode.

Cause

(Cooling or drying mode)
1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Low-load (low temperature)

operation beyond the tolerance
range

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is
defective.

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(clogs)

(Heating mode)
1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Over-load (high temperature)

operation beyond the tolerance
range

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is
defective.

Countermeasure

(Cooling or drying mode)
1 Check clogging of the filter.
2 Remove shields.

4 Refer to 12-8. DC Fan motor (FAN MOTOR/

INDOOR CONTROLLER BOARD)

5 Check outdoor fan motor.
67 Check operating condition of refrigerant
circuit.

(Heating mode)
1 Check clogs of the filter.
2 Remove shields.

4 Refer to 12-8. DC Fan motor (FAN MOTOR/

INDOOR CONTROLLER BOARD)

P8

Pipe temperature

<Cooling mode>
Detected as abnormal when the pipe tem­perature is not in the cooling range 3 min­utes after compressor start and 6 minutes
after the liquid or condenser/evaporator
pipe is out of cooling range.
Note 1) It takes at least 9 minutes. to

detect.

Note 2) Abnormality P8 is not detected in

drying mode.

Cooling range :

GHJÛ&GHJÛ)] (TH-TH1)

TH: Lower temperature between: liquid

pipe temperature (TH2) and condens­er/evaporator temperature (TH5)

TH1: Intake temperature
<Heating mode>

When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when condenser/
evaporator pipe temperature is not in heat­ing range within 20 minutes.

Note 3) It takes at least 27 minutes to

detect abnormality.

Note 4) It excludes the period of defrosting

(Detection restarts when defrosting
mode is over)

Heating range :

GHJÛ&GHJÛ)[ (TH5-TH1)

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(clogs)

8 Bypass circuit of outdoor unit is

defective.

1 Slight temperature difference

between indoor room

temperature and pipe <liquid
or condenser / evaporator>
temperature thermistor

• Shortage of refrigerant

• Disconnected holder of pipe
<liquid or condenser /

evaporator> thermistor

• Defective refrigerant circuit

2 Converse connection of
extension pipe (on plural units

connection)
3 Converse wiring of indoor/
outdoor unit connecting wire

(on plural units connection)
4 Defective detection of indoor

room temperature and pipe

<condenser / evaporator>
temperature thermistor
5 Stop valve is not opened
completely.

5 Check outdoor fan motor.
6~8Check operating condition of refrigerant
circuit.

1~4 Check pipe <liquid or condenser /

evaporator> temperature with room
temperature display on remote

controller and outdoor controller circuit

board.

Conduct temperature check with outdoor
controller circuit board after connecting

(

‘A-Control Service Tool(PAC-SK52ST)’.

23 Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.

)

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Error Code

P9

Abnormal point and detection method

Abnormality of pipe temperature therm­istor / Condenser-Evaporator (TH5)

1 The unit is in three-minute resume pro-

tection mode if short/open of thermistor
is detected. Abnormal if the unit does
not get back to normal within three min­utes. (The unit returns to normal opera­tion, if it has normally reset.)

2 Constantly detected during cooling, dry-

ing, and heating operation (except
defrosting)

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Cause

1 Defective thermistor
characteristics
2 Contact failure of connector

(CN44) on the indoor controller

board (Insert failure)
3 Breaking of wire or contact
failure of thermistor wiring
4 Temperature of thermistor is

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defective refrigerant circuit.
5 Defective indoor controller

board

Countermeasure

1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2 Check contact failure of connector (CN44)

on the indoor controller board.
Refer to 12-5.
Turn the power on and check restart after

inserting connector again.
4 Operate in test run mode and check pipe

<condenser / evaporator> temperature.
If pipe <condenser / evaporator> tempera-

ture is extremely low (in cooling mode) or

high (in heating mode), refrigerant circuit

may have defect.
5 When no problems are found in 1-4 above,

replace the indoor unit control board.

Remote controller transmission
error(E0)/signal receiving error(E4)

1 Abnormal if main or sub remote controller

can not receive normally any transmis­sion from indoor unit of refrigerant

address “0” for three minutes.
(Error code : E0)
2 Abnormal if sub remote controller could

not receive for any signal for two min-

utes. (Error code: E0)
1 Abnormal if indoor controller board can

E0

or

E4

E3

or

E5

not receive normally any data from

remote controller board or from other

indoor controller board for three minutes.

(Error code: E4)
2 Indoor controller board cannot receive

any signal from remote controller for two

minutes. (Error code: E4)

Remote controller transmission
error(E3)/signal receiving error(E5)

1 Abnormal if remote controller could not

find blank of transmission path for six

seconds and could not transmit.

(Error code: E3)
2 Remote controller receives transmitted

data at the same time, compares the

data, and when detecting it, judges

different data to be abnormal 30
continuous times. (Error code: E3)

1 Abnormal if indoor controller board could

not find blank of transmission path.

(Error code: E5)
2 Indoor controller board receives trans-

mitted data at the same time, compares

the data,and when detecting it, judges

different data to be abnormal 30

continuous times. (Error code: E5)

1 Contact failure at transmission

wire of remote controller

2 All remote controllers are set

as “sub” remote controller. In
this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit

board.
3 Mis-wiring of remote controller
4 Defective transmitting receiving

circuit of remote controller
5 Defective transmitting receiving

circuit of indoor controller board

of refrigerant address “0”
6 Noise has entered into the

transmission wire of remote

controller.

1 Two remote controller are set

as “main.”
(In case of 2 remote con­ trollers)
2 Remote controller is connected

with two indoor units or more.
3 Repetition of refrigerant

address
4 Defective transmitting receiving

circuit of remote controller
5 Defective transmitting receiving

circuit of indoor controller

board
6 Noise has entered into trans-

mission wire of remote control-

ler.

1 Check disconnection or looseness of indoor

unit or transmission wire of remote controller.
2 Set one of the remote controllers “main”.
If there is no problem with the action above.
3 Check wiring of remote controller.

• Total wiring length: max.500m
(Do not use cable 5 3 or more)

• The number of connecting indoor units:
max.16units

• The number of connecting remote control­ler: max.2units

When it is not the above-mentioned problem of
1~3

4 Diagnose remote controllers.

a) When “RC OK” is displayed,

Remote controllers have no problem.
Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.

b) When “RC NG” is displayed,

Replace remote controller.
c) When “RC E3” is displayed,
d) When “ERC 00-06” is displayed,
[ c),d)oNoise may be causing abnormality. ]

 If the unit is not normal after replacing

indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.

1 Set a remote controller to main, and the

other to sub.

2 Remote controller is connected with only one

indoor unit.

3 The address changes to a separate setting.
4~6 Diagnose remote controller.

a) When “RC OK”is displayed, remote con-

trollers have no problem.
Turn the power off,and on again to check.
When becoming abnormal again, replace

indoor controller board.
b)When “RC NG”is displayed, replace

remote controller.
c)When “RC E3”or “ERC 00-66”is displayed,

noise may be causing abnormality.

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31

Error Code

E6

Abnormal point and detection method

Indoor/outdoor unit communication
error (Signal receiving error)

1 Abnormal if indoor controller board
cannot receive any signal normally for

six minutes after turning the power on.
2 Abnormal if indoor controller board
cannot receive any signal normally for

three minutes.
3 Consider the unit as abnormal under the

following condition: When two or more

indoor units are connected to an
outdoor unit, indoor controller board
cannot receive a signal for three minutes

from outdoor controller circuit board, a

signal which allows outdoor controller

circuit board to transmit signals.

Cause

1 Contact failure, short circuit or,

mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire

2 Defective transmitting receiving

circuit of indoor controller board

3 Defective transmitting receiving

circuit of indoor controller board

4 Noise has entered into indoor/

outdoor unit connecting wire.

Countermeasure

 Check LED display on the outdoor control cir-

cuit board. (Connect A-control service

tool, PAC-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.
1 Check disconnection or looseness of indoor/

outdoor unit connecting wire of indoor unit or

outdoor unit.
Check all the units in case of twin triple
indoor unit system.
2-4 Turn the power off, and on again to check.

If abnormality generates again, replace

indoor controller board or outdoor
controller circuit board.
 Other indoor controller board may have
defect in case of twin triple indoor unit
system.

E7

Indoor/outdoor unit communication
error (Transmitting error)

Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.

Indoor controller board

Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.

Fb

Remote controller control board

1 Abnormal if data cannot be read normal-

ly from the nonvolatile memory of the
remote controller control board.

(Error code: E1)
2 Abnormal if the clock function of remote

controller cannot be operated normally.

(Error code: E2)

1 Defective transmitting receiving

circuit of indoor controller board

2 Noise has entered into power

supply.

3 Noise has entered into outdoor

control wire.

1 Defective indoor controller

board

1 Defective remote controller 1 Replace remote controller.

1-3 Turn the power off, and on again to check.

If abnormality generates again, replace

indoor controller board.

1 Replace indoor controller board.

E1

or

E2

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32

12-4. Troubleshooting by inferior phenomena

(1)LED2 on indoor controller board

Phenomena

is off.

• When LED1 on indoor controller board is also off.
1 Power supply of rated voltage is not supplied to out-

door unit.

2 Defective outdoor controller circuit board

3 Power supply of 208~230V is not supplied to indoor

unit.

4 Defective indoor controller board

Cause

Note: Refer to the manual of outdoor unit for the detail of remote
controller.

Countermeasure

1 Check the voltage of outdoor power
supply terminal block (L, N) or (L

• When AC 208~230V is not detected.
Check the power wiring to outdoor unit
and the breaker.

• When AC 208~230V is detected.

—Check 2 (below).
2 Check the voltage between outdoor
terminal block S1 and S2.

• When AC 208~230V is not detected.

Check the fuse on outdoor controller

circuit board.

Check the wiring connection.

• When AC 208~230V is detected.

—Check 3 (below).
3 Check the voltage between indoor terminal

block S1 and S2.

• When AC 208~230V is not detected.
Check indoor/outdoor unit connecting
wire for mis-wiring.

• When AC 208~230V is detected.

—Check 4 (below).
4 Check the fuse on indoor controller board.
Check the wiring connection.
If no problem are found, indoor controller

board is defective.

3, N).

(2)LED2 on indoor controller board
is blinking.

• When LED1 on indoor controller board is also blinking.
Connection failure of indoor/outdoor unit connecting
wire

• When LED1 is lit.
1 Mis-wiring of remote controller wires

Under twin triple indoor unit system, 2 or more indoor

units are wired together.

2 Refrigerant address for outdoor unit is wrong or not

set.
Under grouping control system, there are some units
whose refrigerant address is 0.

3 Short-cut of remote controller wires
4 Defective remote controller

Check indoor/outdoor unit connecting wire
for connection failure.

1 Check the connection of remote con­ troller wires in case of twin triple indoor
unit system. When 2 or more indoor units
are wired in one refrigerant system,
connect remote controller wires to one of

those units.

2 Check the setting of refrigerant address in

case of grouping control system.
If there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor
controller circuit board.
34 Remove remote controller wires and
check LED2 on indoor controller board.

• When LED2 is blinking, check the
short-cut of remote controller wires.

• When LED2 is lit, connect remote

controller wires again and:
if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal
block etc. has returned to normal.

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33

12-5. Test point diagram

12-5-1. Power supply board

MVZ-A12AA7
MVZ-A18AA7
MVZ-A24AA7
MVZ-A30AA7
MVZ-A36AA7

CND

CND Power supply voltage (208 - 230VAC)

CNMF Fan motor output

1 - 4: 310 - 340 VDC
5 - 4: 15 VDC
6 - 4: 0 - 6.5 VDC
7 - 4: Stop 0 or 15 VDC
Run 7.5 VDC

(0 - 15 pulse)

CNXA1

Connect to the indoor controller board

CNXB1

Connect to the indoor controller board

CNXC1

Connect to the indoor controller board

CNXA2

Connect to the indoor power board

CNXB2

Connect to the indoor power board

CNXC2

Connect to the indoor power board

(*1)

V

Voltage on the (-) side of PC51 and

FG

C25
(Same with the voltage between 7 (+)
and 4 (-) of CNMF)

V

Voltage between the C25 pins 15

CC

VDC
(Same with the voltage between 5 (+)
and 4 (-) of CNMF)

V

sp Voltage between the C53 pins

0VDC (with the fan stopped)
1 - 6.5VDC (with the fan in operation)
(Same with the voltage between 6 (+)
and 4 (-) of CNMF)

CNXB1 CNXC1 CNXA1 CNMF

PC51

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(*1)

C53

(*1)

C25

(*1)

34

MVZ A12AA4

12-5-2. Indoor controller board

MVZ-A12AA7

MVZ-A18AA4

MVZ-A18AA7

MVZ-A24AA4

MVZ-A24AA7

MVZ-A30AA4

MVZ-A30AA7

MVZ-A36AA4

MVZ-A36AA7

SWE Emergency operation

SW1 Model selection

SW2 Capacity setting

CN105 Radio frequency interface

CN22CN105

CN32 Remote start/stop adapter

CN25

CNER

CN41

CN32

SWE

SW1
SW2

CNXA2

CNXC2

CNXB2

CN51

CN24-2

CN2C

CN24-1
CN20

CN4F

CN44

CN22 F

CN51 Centralized control

CN41 JAMA standard HA terminal A

CN44 Thermistor

CN4F Float sensor

CN20 Thermistor (Inlet temperature)

CN24-1

CN24-2

CN4Y For fan control

CN3C Indoor-outdoor transmission

CN90 Wireless remote controller

CNXA2

or MA remote controller cable con­nection
(10 - 13 VDC)

(liquid/condenser/evaporator
temperature)

1st Heater control (12VDC)

2nd Heater control

(0 - 24VDC)

Connect to the indoor controller board

CN3C

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CN4Y

CN90

CNF

35

CNXB2

Connect to the indoor controller board

CNX

C2

Connect to the indoor controller board

CNXA1

Connect to the indoor power board

CNXB1

Connect to the indoor power board

CNXC1

Connect to the indoor power board

CNER

ERV controll

CN2C

ERV input

CN25

Humidity conrol

CNF

Humidity input

12-6. Trouble criterion of main parts
MVZ-A12AA7
MVZ-A18AA7
MVZ-A24AA7
MVZ-A30AA7
MVZ-A36AA7

Part name

Room temperature
thermistor
(TH1)

Pipe temperature
thermistor/liquid
(TH2)

Condenser/evaporator
temperature thermistor
(TH5)

Wiring diagram

Check method and criterion

Measure the resistance with a tester.
(Part temperature 10C (50F) ~ 30C (86F))

Normal

4.3k~9.6k

Vm (Power supply for motor)

Vcc (Power supply for control)

Regulator Hall IC

Vsp (Speed command voltage)

PG (Pulse output for rotation)

GND

Abnormal

Opened or short-circuited

Motor

Board with build-in motor

Power
device

Current detecting resistor

Pre

driver

Motor winding

12-7. Thermistor

<Thermistor Characteristic graph>

Thermistor for
lower temperature

Thermistor R

0 = 15 k" ± 3%

Fixed number of B = 3480 k" ± 2%
Rt = 15exp { 3480( ) }
0°C (32°F) 15 k"

10°C (50°F) 9.6 k"
20°C (68°F) 6.3 k"
25°C (77°F) 5.2 k"
30°C (86°F) 4.3 k"
40°C (104°F) 3.0 k"

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Room temperature thermistor (TH1)
Pipe temperature thermistor (TH2)
Condenser/evaporator temperature
thermistor (TH5)

1

273+t

1

273

36

< Thermistor for lower temperature >

50

40

30

20

Resistance (K")

10

0

-20 -10 0 10 20 30 40 50

-4 14 32 50 68 86 104 122

Temperature

(˚C)

˚F

12-8. DC Fan motor (FAN MOTOR/INDOOR CONTROLLER BOARD)

Check method of DC fan motor (fan motor/indoor controller circuit board)

Notes

1

· High voltage is applied to the connecter (CNMF) for the fan motor. Give attention to the service.

· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller circuit
Self check

2

Symptom : The indoor fan cannot turn around.

Check the fuse (FUSE) on indoor
controller board.

board and fan motor.)

Did the fuse blow?

No

Wiring contact check

Contact of fan motor connector (CNMF)

Yes

Check the drain pump (DP)
Is the resistance between
terminals normal?

No

Replace drain pump (DP).

Is there no contact failure?

Yes

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit

TEST POINT

1 :VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC310~340V

No

Wiring recovery

board.

TEST POINT 2 :VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V

Is the voltage normal?

No

Replace indoor

controller board.

Check the operation.

NG

Replace the fan motor.

Yes

OK

END

Measure the resistance of the fan motor.

Is the resistance of the fan motor

normal?(Refer to below table)

Yes

Does the fan motor rotate smoothly?

Yes

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

No

No

Yes

Replace indoor controller board (I.B).
Replace fan motor (MF).

MVZ-A12,18, 24, 30, 36AA7

Measuring points Resistance

pin 1 - pin 4

O.L.
pin 5 - pin 4 50k
pin 6 - pin 4 150k
pin 7 - pin 4

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

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O.L.

Does the voltage between pin 7 and pin 4

of connector CNMF repeat 0V and 5V?

Yes

Check the operation of fan.

NG

OK

Replace indoor controller board.

37

END

No

Replace the fan motor.

Yes

Check the operation of fan.

NG

OK

Replace indoor controller board.

END

12-9. Functions of DIP switch and jumper wire

Each function is controlled by the dip switch and the jumper wire on control p.c. board.
SW1 and SW2 are equipped only for service parts.
Model setting and capacity setting are memorized in the nonvolatile memory of the control p.c. board of
the unit.

(Marks in the table below) Jumper wire ( : Short : Open)

Jumper wire

SW1

SW2

J41
J42

Functions

Model
settings

Capacity
settings

Pair number
setting with
wireless
remote
controller

Setting by the dip switch and jumper wire
For service board

12345

MODELS

MVZ-A12AA7

ON

OFF

Service board

1 2 3 4 5

ON
OFF

MVZ-A18AA7

1 2 3 4 5

ON
OFF

MVZ-A24AA7

1 2 3 4 5

ON
OFF

MVZ-A30AA7

1 2 3 4 5

ON
OFF

MVZ-A36AA7

1 2 3 4 5

ON
OFF

Wireless remote

controller setting

0
1
2

3 ~ 9

Control PCB setting

J41 J42

Remarks

<Settings at time of factory shipment>
Wireless remote controller: 0
Control PCB: (for both J41 and J42)
Four pair number settings are supported.
The pair number settings of the wireless remote
controller and indoor control PCB (J41/J42) are
given in the table on the left.
(' ' in the table indicates the jumper line is disco­nnected.)

JP1

JP3

Unit type
setting

Indoor
controller
board type

Model

Without TH5

With TH5

Indoor controller board type

Factory shipment

setting

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JP1

Service parts

There is no jumper (JP1) because these models
have the cond./eva. temperature thermistor (TH5).

JP3

38

13

DISASSEMBLY PROCEDURE

13-1. Control box

Exercise caution when removing heavy parts.

1. Remove the Electric panel (2 screws)

Fig. 1

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39

13-2. Thermistor (Return Air)

Exercise caution when removing heavy parts.

1. Remove the Filter panel (2 thumbscrews).

2. Remove the Blower panel (2 screws).

3. Remove the cover over the Return Air thermistor
box and unplug the thermistor.

4. Pull out the thermistor holder and thermistor inside
the box.

Fig. 3

Fig. 4

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40

13-3. Coil Assembly

Exercise caution when removing heavy parts.

1. Remove the Electrical, Blower and Filter panel
indicated in sections 1 and 2.

2. Remove the Coil panel by removing all of the
screws securing it to the (3) smaller panels for
refrigerant and drain lines.

3. Slide the smaller panels in the directions indicated
and remove.

Fig. 5

4 Remove the (1 or 2) brackets that secure the
coil, unplug the thermistors from the control
board and route the wires out of the control box
area and into the coil section. Next, slide the
coil from the frame.

Fig. 6

Fig. 7

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Fig. 8

41

5. Remove the plate covering the coil assembly to
access the thermistors.

6. Remove lower and side drain pan.

Fig. 9

Fig. 10

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42

13-4. Blower/Fan Assembly

Exercise caution when removing heavy parts.

1. Remove the Blower and Filter panel (along
with
filter if installed) indicated in section 2.

2. Remove the (1 or 2) brackets that secure the
coil assembly.

3. Remove the door that covers the small enclosure
attached to the fan assembly (Fig.12).
Unplug the motor and route the wire harness out
of the enclosure.

4. Remove the (2) screws that secure the fan
assembly and slide out.

Fig. 11

Fig. 12

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43

This product is designed and intended for use in the residential,

commercial and light-industrial environment.

Please be sure to put the contact address/telephone number on

this manual before handing it to the customer.

MEUS DOC# MD-1404-K009, December 2016

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MITSUBISHI ELECTRIC US, INC.

www.mitsubishielectric-usa.com

Toll Free: 800-433-4822