Mitsubishi Electric Mr.Slim MU-A18ND-S1 Manuale utente

CONTENTS

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

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

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

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

5. WIRING DIAGRAM ············································6

6. REFRIGERANT SYSTEM DIAGRAM ················8

7. PERFORMANCE CURVES······························10

8. TROUBLESHOOTING······································12

9. DISASSEMBLY INSTRUCTIONS ····················21

10. PARTS LIST······················································27

11. RoHS PARTS LIST···········································30

SPLIT-TYPE AIR CONDITIONERS

MU-A18ND

MU-A18ND-

MU-A24ND-

MU-A30ND-

MU-A30ND- S2

Indoor unit service manual

MS-A• ND Series (OB404)

No. OB405

REVISED EDITION-E

SERVICE MANUAL

Models

OUTDOOR UNIT

NOTE:

• This service manual describes technical data of the outdoor units.

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

For servicing of RoHS compliant products, refer to the RoHS Parts List.

Please void OB405 REVISED EDITION-D.

Revision E:

•SPECIFICATION has been modified.

OB405E.qxp 09.10.14 9:16 AM Page 1

TECHNICAL CHANGES1

Compressor: NH30VCD ➞ RH247NRAT

Compressor: RH277NHD

➞

RH247NRAT

Electricity receiving unit: Indoor unit ➞ Outdoor unit

Gas pipe diameter: [15.88

➞

[12.7

Rated voltage: 220V ➞ 220-230V

Frequency

New Model

Old Model

MU-18TN -

: change

MU-A18ND -

60Hz

MU-18SN -

Outdoor unit:Unit size:W850mmoH605mmoD290mm ➞ W840mmoH850mmoD330mm

Outdoor unit:Unit size:W870mmoH850mmoD295mm ➞ W840mmoH850mmoD330mm

Compressor: NH38NBD

➞

PH33NPBT

Electricity receiving unit: Indoor unit ➞ Outdoor unit

Liquid refrigerant pipe diameter: [9.52

➞

[6.35

Rated voltage: 220V ➞ 220-230V

Frequency

New Model

Old Model

MU-24TN -

MU-A24ND -

60Hz

MU-24SN -

MU-A30ND -

New model

MU-A18ND -➔MU-A18ND -

• Valve cover has been added.

S2S1

MU-A24ND -➔MU-A24ND -

• Compressor contactor has been added.

S2S1

MU-A30ND -➔MU-A30ND -

• Solenoid valve and solenoid valve coil have been changed.

S2S1

Revision A:

• Check of solenoid valve coil has been partially modified.

Revision B:

• MU-A24ND -has been added.

Revision C:

• MU-A18ND -has been added.

Revision D:

• MU-A30ND -has been added.

Revision E:

• SPECIFICATION has been modified.

OB405E.qxp 09.10.14 9:16 AM Page 2

PART NAMES AND FUNCTIONS

SPECIFICATION

Outdoor model

Function

Power supply

Capacity

Dehumidification

Air flow (High/Low)

Power outlet

Running current (Total)

Power input (Total)

Power factor (Total)

Starting current (Total)

Compressor motor current

Fan motor current

Model

Output

Winding

resistance (at 20:)

Model

Winding

resistance (at 20:)

Dimensions WOHOD

Weight

Sound level (High/Low)

Fan speed (High/Low)

Fan speed regulator

Refrigerant filling

capacity (R22)

Refrigeration oil (Model)

R/h

K/h

rpm

Cooling

Single phase

220-230V, 60Hz

2,880

0.66

PH33NPBT

1,500

C-R 0.84

C-S 2.09

RA6N75-BA

WHT-BLK 65.0

BLK-RED 65.4

790

2.20

900 (MS32N1)

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance (C.O.P) (Total)

Capacity

2,480

0.55

RH247NRAT

1,200

C-R 1.43

C-S 2.06

RA6V60-MA

WHT-BLK 71.2

BLK-RED 89.3

850o605o290

945

1.40

520 (MS56)

ISO 5151

5.10

2.3

8.52

1,800

96-92

7.60

2.83

SSA 385

5.9

2.7

20( )

12.42

2,650

11.39

2.23

ISO 5151

6.6

3.2

15( )

10.54

2,250

97-93

9.50

2.93

SSA 385

6.6

3.2

17.52

3,700

16.49

1.78

ISO 5151

8.1

4.3

14.25

3,010

96-92

13.22

2.69

SSA 385

4.40

1.8

9.94

2,100

9.02

2.10

MU-A24ND MU-A30ND

2,880/1,380

0.66

NH44NAVT

2,000

C-R 0.62

C-S 1.40

RA6N75-AA

WHT-BLK 64.2 BLK-YLW 32.9

YLW-RED 32.7

55/51

790/490

2.40

1,300 (MS32N1)

840o850o330

MU-A18ND

NOTE: Test conditions are based on ISO 5151 / SSA 385

Cooling : Indoor DB27°C WB19°C / DB29°C WB19°C

Outdoor DB35°C WB24°C / DB46°C WB24°C

Indoor-Outdoor piping length: 5 / 7.5 m

OUTDOOR UNIT

Air inlet

Air outlet

Drain outlet

Piping

Drain hose

Air inlet

Air outlet

(back and side)

MU-A18ND MU-A24ND MU-A30ND

OB405E.qxp 09.10.14 9:16 AM Page 3

OUTLINES AND DIMENSIONS4

Unit: mm

100mm or more

350mm or more

100mm or more

REQUIRED SPACE

500mm or more

100

157

161

Liquid refrigerant

pipe joint

Refrigerant pipe

(Flared) [6.35

Service panel

183

500

850

20350

248

605

292

310

290

345

Air in

Air out

Drainage

3holes [33

Air in

Drainage

hole [16.2

355

30-

35-

Gas refrigerant

pipe joint

Refrigerant pipe

(flared) [12.7

MU-A18ND - S1

OUTDOOR UNIT

100

157

161

Liquid refrigerant

pipe joint

Refrigerant pipe

(Flared) [6.35

Service panel

183

500

850

20350

248

605

292

310

290

345

Air in

Air out

Drainage

3holes [33

Air in

Drainage

hole [16.2

355

30-

35-

Gas refrigerant

pipe joint

Refrigerant pipe

(flared) [12.7

100mm or more

350mm or more

100mm or more

REQUIRED SPACE

500mm or more

MU-A18ND - S2

OB405E.qxp 09.10.14 9:16 AM Page 4

30-

35-

155

198

515

299

330

360

850

430

500

121

840

REQUIRED SPACE Open as a rule

500mm or more if

the front and both

sides are open

100mm or more

200mm or more if

there are obstacles

to both sides

Open as a rule

500mm or more if the back,

both sides and top are open

Service panel

Gas refrigerant

pipe joint

Refrigerant pipe

(flared) [15.88

Liquid refrigerant

pipe joint

Refrigerant pipe

(flared) [6.35(MU-A24ND)

[9.52(MU-A30ND)

350mm or more

100mm or more

MU-A24ND MU-A30ND

OUTDOOR UNIT

OB405E.qxp 09.10.14 9:16 AM Page 5

WIRING DIAGRAM

MU-A18ND

TB2

RED

ORN

BLU

BRN

WHT

GRN/YLW

RED

BLACK

WHITE

ORANGE

321

BLK

TB1

BRN

BLU C1 RED

BLU

220-230V~

CONNECTING

TO INDOOR UNIT

POWER SUPPLY

220-230V ~/N 60Hz

BLU

DSAR

220-230V~

WHT

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

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

3.Symbols below indicate.

: Connector

: Terminal block,

NOTES:

SYMBOL

DSAR

SYMBOL

TB1

TB2

NAME NAME NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

FUSE (3.15A)

COMPRESSOR(INNER PROTECTOR)

OUTDOOR FAN MOTOR(INNER PROTECTOR)

TERMINAL BLOCK

MU-A24ND- S1

BRN

RED

BLK

WHT

BLU

TB2

BLU

WHT

RED

ORN

DSAR

TB1

GRN/YLW

BRN

ORN

RED

BLU

WHT

BLU SC

BLK

SYMBOL

DSAR

SYMBOL

TB1

TB2

NAME NAME NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

FUSE(3.15A)

COMPRESSOR(INNER PROTECTOR)

OUTDOOR FAN MOTOR(INNER PROTECTOR)

TERMINAL BLOCK

NOTES: 1.Use copper conductors only (For field wiring).

2.Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (2,N,L).

3.Symbols below indicate.

: Terminal block, : Connector

TO INDOOR UNIT CONNECTING

220-230V~

POWER SUPPLY

~/N 220-230V 60Hz

OUTDOOR UNIT

OB405E.qxp 09.10.14 9:16 AM Page 6

MU-A30ND

SYMBOL

DSAR

F61

LEV

SYMBOL

NR61

RT62

RT63

SR61

SR62

TB1

TB2

SYMBOL

T61

X52

X63

21S2

52C

NAME

DEICER

P.C. BOARD

12V

WHT

BLU

RED

BLU

WHT

T61

YLW

BLK

WHT

RED

BLU

TB2

CN730

YLW

BLK

WHT

52C

RED

ORN

A1 A2BLU 52C

DSAR

WHT

BLK

BLU

NR61

TB1

GRN/YLW

BRN

SR62

SR61

F61

TAB52

COM NO

X52

CN711

CN724

CN662

RT62 RT63

123

ORN

RED

3456

LEV

COM NO

X63 3

CN722

X52

220-230V~

TO INDOOR UNIT CONNECTING

POWER SUPPLY

~/N 220-230V 60Hz

X63

21S2

NAME NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

FUSE(3.15A)

EXPANSION VALVE COIL

COMPRESSOR(INNER PROTECTOR)

OUTDOOR FAN MOTOR(INNER PROTECTOR)

VARISTOR

DISCHARGE TEMPERATURE THERMISTOR

AMBIENT TEMPERATURE THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

TRANSFORMER

CONTACTOR

SOLENOID VALVE COIL RELAY

SOLENOID VALVE COIL

COMPRESSOR CONTACTOR

NOTES: 1.Use copper conductors only (For field wiring).

2.Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (3,N,2).

3.Symbols below indicate.

: Terminal block, : Connector

MU-A24ND- S2

OUTDOOR UNIT

SYMBOL

DSAR

SYMBOL

TB1

TB2

52C

NAME NAME NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

FUSE(3.15A)

COMPRESSOR(INNER PROTECTOR)

OUTDOOR FAN MOTOR(INNER PROTECTOR)

TERMINAL BLOCK

COMPRESSOR CONTACTOR

NOTES: 1.Use copper conductors only (For field wiring).

2.Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (2,N,L).

3.Symbols below indicate.

: Terminal block, : Connector

BLK

WHT

ORN

BLU

WHT

ORN

RED

BLK

WHT

BLU

BLU BLU

WHT

BRN

52C

GRN/YLW

BLU

BRN

TO INDOOR UNIT CONNECTING

220-230V~

POWER SUPPLY

~/N 220-230V 60Hz

DSAR

TB2

TB1

52C

RED RED

OB405E.qxp 09.10.14 9:16 AM Page 7

REFRIGERANT SYSTEM DIAGRAM6

MU-A24ND

OUTDOOR UNIT

Outdoor

heat

exchanger

Flared connection

Stop valve

(with service port)

Capillary tube

[3.0 x [2.0 x 550

Refrigerant flow in cooling

Compressor

Refrigerant pipe

[15.88

(with heat insulator)

Refrigerant pipe

[6.35

(with heat insulator)

Strainer

#100

Accumulator

MU-A18ND

OUTDOOR UNIT

Unit : mm

Refrigerant pipe

{6.35

(with heat insulator)

Refrigerant pipe

{12.7

(with heat insulator)

Compressor

Outdoor heat

exchanger

Flared

connection

Strainer

#100

Stop Valve

(with service port)

Stop Valve Capillary tube

[3.0 x [1.8 x 400

OB405E.qxp 09.10.14 9:16 AM Page 8

Outdoor

heat

exchanger

Flared connection Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

(with service port)

Capillary tube

[3.6 x [2.4 x 50

Refrigerant flow in cooling

Compressor

Refrigerant pipe

[15.88

(with heat insulator)

Refrigerant pipe

[9.52

(with heat insulator)

Strainer

#100

Strainer

#100

Accumulator

Ambient

temperature

thermistor

RT63

Capillary tube

[4.0 x [2.4 x 200

Capillary tube

[4.0 x [2.4 x 100

LEV

(Expansion valve)

Solenoid valve

[4.2 x [3.0 x 50

MU-A30ND

OUTDOOR UNIT

MAX.REFRIGERANT PIPING LENGTH and MAX.HEIGHT DIFFERENCE

Model

Piping size O.D : mm

Refrigerant piping : m

Max. length

Max. Height

difference

Gas Liquid

MU-A18ND

MU-A24ND

MU-A30ND

{15.88

{6.35

{9.52

{12.7

Indoor

unit

Outdoor unit

Max. length

Max. Height

difference

ADDITIONAL REFRIGERANT CHARGE(R22 : g)

NOTE : Calculation : Xg=15g/m ✕ (Refrigerant piping length (m)-7)

Model Outdoor unit precharged Refrigerant piping length (one way)

15m

120

20m

195

30m

345

10m

2,200

1,400

2,400

MU-A18ND

MU-A30ND

MU-A24ND

Unit : mm

OB405E.qxp 09.10.15 1:32 PM Page 9

PERFORMANCE CURVES7

The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions.

Since operating conditions vary according to the areas where these units are installed. The following information has been

provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

198 ~ 253V, 60Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

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

(2) Indoor outlet air wet-bulb temperature : °CWB

(3) Outdoor intake air dry-bulb temperature : °CDB

(4) Total input: W

Indoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between the

indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

MU-A18ND MU-A24ND MU-A30ND

Indoor intake air WB temperature (:)

Outdoor intake air DB temperature (:)

Indoor intake air WB temperature (:)

Outdoor intake air DB temperature (:)

MS-A30ND

MU-A30ND

MS-A24ND

MU-A24ND

MS-A18ND

MU-A18ND

9.9

9.1

8.3

7.5

6.7

5.9

12.5

11.4

10.3

9.3

8.3

7.3

18.6

16.8

15.1

13.5

12.0

10.5

Wet and dry-bulb

thermometers

Wet-and dry-bulb

thermometers

How to measure the indoor air wet/dry-bulb temperature difference

1. Attach at least 2 sets of wet and-dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets

of wet-and-dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air

speed is high.

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

Cover the thermometers to prevent direct rays of the sun.

3. Check that the air filter is cleaned.

4. Open windows and doors of the room.

5. Press the EMERGENCY OPERATION switch once to start the EMERGENCY COOL MODE.

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

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

INDOOR UNIT OUTDOOR UNIT

OB405E.qxp 09.10.14 9:16 AM Page 10

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