No. OB403 SERVICE MANUAL MU-A08ND- MU-A10ND- …nonul.mylinkdrive.com/files/MU-A08~15ND_Service... · cc MU-A15ND 4.0 1.8 2280 35 5.62 0.5 2.97 RH207NRAT 1000 C-R 1.50 ... MU-A12ND

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································22. PART NAMES AND FUNCTIONS······················33. SPECIFICATION·················································44. OUTLINES AND DIMENSIONS ·························55. WIRING DIAGRAM ············································86. REFRIGERANT SYSTEM DIAGRAM················97. PERFORMANCE CURVES······························128. TROUBLESHOOTING······································159. DISASSEMBLY INSTRUCTIONS ····················17

10. PARTS LIST······················································2511. RoHS PARTS LIST···········································2912. OPTIONAL PARTS···········································33

Wireless typeModels

SPLIT-TYPE, AIR CONDITIONERS

MU-A08ND-MU-A08ND-MU-A10ND-MU-A10ND-MU-A12ND-MU-A15ND-MU-A15ND- C2

C1

C1

C2

C1

C2

C1

MU-A10NDMU-A12ND

TM

Revision:B• MU-A10ND - has been added.• RoHS PARTS LIST has been added.

C2

Please void OB403 REVISED EDITION-A.

NOTE:This service manual describes technical data of 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.

OUTDOOR UNIT

Indoor unit service manualMS-A•ND Series (OB402)

No. OB403REVISED EDITION-B

OB403B--1.qxp 07.6.26 10:28 AM Page 1

2

TECHNICAL CHANGES1

MU-09SN - ➔ MU-A08ND -1. Compressor has been changed. (RH-130NGDT ➔ 2R10S3R236A-6B)2. Outdoor fan motor has been changed. (RA6N23-AA ➔ RA6N33-AA)3. Compressor capacitor has been changed.4. Outdoor fan motor capacitor has been changed.

MU-10SN - ➔ MU-A10ND -1. Outdoor unit model has been changed.

•Valve cover has been added.•Dimension has been changed. (780Wo540Ho255D ➔ 800Wo550Ho285D)

2. Compressor has been changed. (RH145NGCT ➔ RH145NHNT)3. Outdoor fan motor has been changed. (RA6N33-AA ➔ RA6N21-AB)4. Compressor capacitor has been changed.5. Outdoor fan motor capacitor has been changed.6. Outdoor heat exchanger has been changed. ([9.52 L-Bend ➔ [7 Flat)

MU-12SN - ➔ MU-A12ND -1. Outdoor unit model has been changed.

•Valve cover has been added.•Dimension has been changed. (780Wo540Ho255D ➔ 800Wo550Ho285D)

2. Compressor has been changed. (RH167NHDT ➔ RH174NHNT)3. Outdoor fan motor has been changed. (RA6N33-AA ➔ RA6N30-BA)4. Compressor capacitor has been changed.5. Outdoor fan motor capacitor has been changed.6. Outdoor heat exchanger has been changed. ([9.52 L-Bend ➔ [7 Flat)

MU-15SN - ➔ MU-A15ND -1. Compressor has been changed. (RH-207NHDT ➔ RH207NRAT)2. Outdoor fan motor has been changed. (RN6N50-BA ➔ RA6V60-MA)3. Compressor capacitor has been changed.4. Outdoor fan motor capacitor has been changed.

MU-A08ND - ➔ MU-A08ND -MU-A15ND - ➔ MU-A15ND -1. Valve cover has been added.

MU-A10ND - ➔ MU-A10ND -1. Outdoor heat exchanger has been changed.2. Capillary tube has been changed.

C2C1

C2C1

C2C1

C1C2

C1C2

C1C2

C1C2

Revision A:• MU-A08ND - and MU-A15ND - have been added.C2C2

Revision B:• MU-A10ND - has been added. • RoHS PARTS LIST has been added.

C2

OB403B--1.qxp 07.6.26 10:28 AM Page 2

3

PART NAMES AND FUNCTIONS2

OUTDOOR UNIT

MU-A08ND

MU-A15ND

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

(back and side)

MU-A10NDMU-A12ND

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

back and side : MU-A10ND back : MU-A12ND( )

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

(back and side)

OB403B--1.qxp 07.6.26 10:28 AM Page 3

SPECIFICATION

4

3

Outdoor model

Function

Power supply

Coefficient of performance (C.O.P)

CapacityDehumidificationAir flowStarting currentCompressor motor currentFan motor current

ModelOutputWindingresistance (at 20:)ModelWindingresistance (at 20:)Dimensions WOHODWeightSound levelFan speedFan speed regulatorRefrigerant filling capacity (R22)Refrigeration oil (Model)

kWR/hK /h

AAA

W

"

"

mmkgdBrpm

kg

cc

MU-A15ND

4.01.8

228035

5.620.5

2.97RH207NRAT

1000C-R 1.50C-S 2.33

RA6V60-MAWHT-BLK 116 BLK-RED 111 850o605o290

4252

865

1.6

520 (MS56)

Ele

ctric

alda

taF

an

mot

orS

peci

alre

mar

ksC

ompr

esso

rC

apac

ity

MU-A08ND

2.20.5

165619

2.390.363.44

2R10S3R236A-6B470

C-R 4.09C-S 5.58

RA6N33-AAWHT-BLK 150BLK-RED 265780o540o255

2845

700

0.8

260 (ATM0S M60)

MU-A10ND

2.91.2

189626

3.860.263.12

RH145NHNT700

C-R 2.74C-S 3.78

RA6N21-ABWHT-BLK 384 BLK-RED 259

3246

820

0.61.1

300 (MS56)

1

MU-A12ND

3.61.7

188430

4.950.353.08

RH174NHNT800

C-R 2.19C-S 3.3

RA6N30-BAWHT-BLK 312BLK-RED 255

3447

850

1.2

520 (MS56)

CoolingSingle phase

220-230V, 60Hz

800o550o285

C1

C2

NOTE: Test conditions are based on CNS14464, ISO5151. Cooling : Indoor DB27°C / WB19°C

Outdoor DB35°C / WB24°CIndoor-Outdoor piping length: 5 m

OB403B--1.qxp 07.6.26 10:28 AM Page 4

320

25

43-

35-

104

320

285

255

Service panel

Gas refrigerant pipe jointRefrigerant pipe(flared) [9.52

Liquid refrigerant pipe jointRefrigerant pipe(flared) [6.35

Airout

Air in

Air in

Service port

155

90

74

260

10

780500

12240

540

109

32

110147Drainage 3 holes [33

5

OUTLINES AND DIMENSIONS4

Unit : mm

100m

m o

r m

ore

100mm or more

100mm or more

350mm or more

REQUIRED SPACE

400mm or more

OUTDOOR UNIT

MU-A08ND - C1

Unit : mm

OUTDOOR UNIT

MU-A08ND - C2

320

25

43-

35-

104

320

285

255

Service panel

Gas refrigerant pipe jointRefrigerant pipe(flared) [9.52

Liquid refrigerant pipe jointRefrigerant pipe(flared) [6.35

Airout

Air in

Air in

Service port

155

90

8174

260

10

780500

12240

540

109

32

110147Drainage 3 holes [33

100m

m o

r m

ore

100mm or more

100mm or more

350mm or more

REQUIRED SPACE

400mm or more

OB403B--1.qxp 07.6.26 10:28 AM Page 5

6

100mm or more

REQUIRED SPACE

350mm or more500mm or more

100m

m o

r m

ore

100mm or more

30 Service panel

Service port

605

292

20

50183

500850 74

157

100

161

Gas refrigerant pipe jointRefrigerant pipe (flared) [12.7

Liquid refrigerant pipe jointRefrigerant pipe (flared) [6.35 30o

35o

Drainage3 holes [33

Air out

Air in

Air in

248

35

350

50

290

310

345

20355

90

Drainagehole [16.2

MU-A15ND - C1 Unit : mm

Unit : mm

OUTDOOR UNIT

MU-A10ND MU-A12ND

43-

35-

10

69

800

302.5

500

150

22.3

Handle

550

280

164.

599

.5 170.5

23Service panel

Service port

285

344.

5 44

400

Air in

Air out

Air in(MU-A10ND)

17.5

Bol

t pitc

h fo

rin

stal

latio

n30

4~32

5

40

Liquid refrigerant pipe jointRefrigerant pipe (flared) [6.35

Gas refrigerant pipe jointRefrigerant pipe (flared) [9.52 (MU-A10ND) Refrigerant pipe (flared) [12.7 (MU-A12ND)

2 holes 10X21

Basically open 100mm or more without any obstruction in front andon both sides of the unit.

350mm or more

200mm or more

100mm or more

100mm or more

Open two sides of left, right, or rear side.

Drain hole [42

REQUIRED SPACE

OUTDOOR UNIT

OB403B--1.qxp 07.6.26 10:28 AM Page 6

7

Unit : mm

OUTDOOR UNITMU-A15ND - C2

30 Service panel

Service port

605

292

20

50183

500850 81

74

157

100

161

Gas refrigerant pipe jointRefrigerant pipe (flared) [12.7

Liquid refrigerant pipe jointRefrigerant pipe (flared) [6.35 30o

35o

Drainage3 holes [33

Air out

Air in

Air in

248

35

350

50

290

310

345

20355

90

Drainagehole [16.2

100mm or more

REQUIRED SPACE

350mm or more500mm or more

100m

m o

r m

ore

100mm or more

OB403B--1.qxp 07.6.26 10:28 AM Page 7

WIRING DIAGRAM

8

5

MU-A08ND

SYMBOL

C1

C2

F1

SYMBOL

F2

MC

MF

SYMBOL

TB1,TB2

51C

NAME NAME NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

FUSE (3.15A)

FUSE (20A)

COMPRESSOR (OUTER PROTECTOR)

OUTDOOR FAN MOTOR (INNER PROTECTOR)

TERMINAL BLOCK

OVERCURRENT RELAY

NOTE: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./: Terminal block

TB1

TB2

GRN/YLW

N

L

2

N

L

MF

C2

C1

SRED MC

R

C

BLK

PO

WE

R S

UP

PLY

220-

230V

~/N

60H

z

CO

NN

EC

TIN

GT

O IN

DO

OR

UN

IT

BR

N

BLU

BLU

BLU

14 51CWHT WHT

BLKWHTREDWHT

F1

F2

220-230V~

220-230V~

MU-A10NDMU-A12ND

SYMBOL

C1

C2

SYMBOL

F

MC

SYMBOL

MF

TB1,TB2

NAME NAME NAME



FUSE (3.15A)

COMPRESSOR (INNER PROTECTOR)

OUTDOOR FAN MOTOR (INNER FUSE)

TERMINAL BLOCK

NOTE: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./: Terminal block :Connector

N

L

TB1

L

N

2

TB2 C2

220-230V~

C1

BLU

BLU

WH

T

WHT

RED

R

MCC

WHTCONNECTING

BLK

S

BLU

1

32 MF

WHTBLKRED

GRN/YLW

RED

PO

WE

R S

UP

PLY

220

-230

V ~

/N 6

0Hz

220-230V~

F

BR

N

BLU

TO INDOORUNIT

OB403B--1.qxp 07.6.26 10:28 AM Page 8

9

REFRIGERANT SYSTEM DIAGRAM6

Strainer#100

MU-A08ND

Refrigerant pipe(Option) [9.52(with heat insulator)

Outdoorheatexchanger

Capillary tube[3.0x[1.4x800

Refrigerant pipe(Option) [6.35(with heat insulator) Refrigerant flow in cooling

Unit: mm

Stop valve(with service port)

Compressor

Flared connection

Flared connection

Stop valve

MU-A15ND

SYMBOL

C1

C2

SYMBOL

F

MC

SYMBOL

MF

TB1,TB2

NAME NAME NAME



FUSE (3.15A)

COMPRESSOR (INNER PROTECTOR)

OUTDOOR FAN MOTOR (INNER PROTECTOR)

TERMINAL BLOCK

NOTE: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./: Terminal block :Connector

CO

NN

EC

TIN

GT

O IN

DO

OR

UN

IT

RS

2

N

L

TB2

RED

ORN

BLU

WHT

GRN/YLW

C2RED

MFBLK

4

WHT

ORN

32

1

WHT

BLK

L

N

TB1 BR

N

BLUC1

RED

C

MC

BLU

PO

WE

R S

UP

PLY

220-

230V

~/N

60H

z

FB

LU

220-230V~

220-230V~

OB403B--1.qxp 07.6.26 10:28 AM Page 9

10

Capillary tube{3.0 x {1.6x750


Stop valve

Compressor Strainer#100

Outdoor heatexchanger

Refrigerant flow in cooling

Refrigerant pipe(Option){6.35(with heat insulator)


Flaredconnection

Flaredconnection

MU-A12ND Unit: mm

MU-A10ND

Refrigerant flow in cooling

Capillary tube{3.0 x { 1.6 x 500 (MU-A10ND - ){3.0 x { 1.6 x 850 (MU-A10ND - )

Compressor


Stop valve

Strainer#100

Outdoor heatexchanger

C1

C2



Flaredconnection

Flaredconnection

Unit: mm

OB403B--1.qxp 07.6.26 10:28 AM Page 10

11

MU-A15ND Unit: mm

Strainer#100

Muffler

Refrigerant pipe(Option) [12.7(with heat insulator)

Outdoorheatexchanger

Capillary tube[3.0x[1.8x700Refrigerant pipe

(Option) [6.35(with heat insulator) Refrigerant flow in cooling


Compressor

Flared connection

Flared connection

Stop valve

OB403B--1.qxp 07.6.26 10:28 AM Page 11

12

MAX.REFRIGERANT PIPING LENGTH

Model Piping size O.D : mm

Refrigerant piping : m

Gas

{9.52

{12.7

Liquid

{6.35

20

20

MU-A08ND

MU-A10ND

MU-A12ND

MU-A15ND

10

10

Max. length

A

Max. height

B

Indoor unit

Max. Height B

Outdoor unit

Refrigerant Piping Max. Length

A

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 20m

195

7m 10m

1200 45

MU-A08ND

MU-A10ND -

MU-A10ND -

MU-A12ND

MU-A15ND

800

600

1100

1200

1600

C1

C2

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

(1) GUARANTEED VOLTAGE198 ~ 253V, 60Hz

(2) AIR FLOWAir 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: WIndoor air wet/dry-bulb temperature difference on the left side of the chart on next page shows the difference between theindoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

MU-A08ND MU-A10ND MU-A12ND MU-A15ND

OB403B--1.qxp 07.6.26 10:28 AM Page 12

13

1 Both indoor and outdoor units are under the same temperature/humidity condition.

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENTCOOL operation

2 Air flow should be set at MAX.

Dry-bulb temperature (:) Relative humidity (%)

20 50

25 60

30 70

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

Indoor intake air WB temperature (:)

Outdoor intake air DB temperature (:)

Indoor intake air WB temperature (:)

Outdoor intake air DB temperature (:)

MU

-A10

ND

MS

-A10

ND

MU

-A12

ND

MS

-A12

ND

MS

-A15

ND

MU

-A15

ND

4.8

4.3

5.4

7.0

6.5

5.9

MU

-A08

ND

5.4

4.8

6.0

7.9

7.3

6.6

7.5

6.7

8.4

11.2

10.2

9.3

8.5

7.5

9.5

12.8

11.6

10.5

MS

-A08

ND

Wet-and dry-bulbthermometers

Wet and dry-bulbthermometers

How to measure the indoor air wet/dry-bulb temperature difference1. 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 airspeed 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

OB403B--1.qxp 07.6.26 10:28 AM Page 13

14

15 18 2050

2560

3070

35(:) (%)

1.5

2.0

2.5

3.0

3.5

32

220V

5

6

7

8

415 18 20

502560

3070

32 35(:) (%)

0.4

0.5

0.6

0.7

0.8220V

MU-A08ND MU-A08ND

Out

door

low

pre

ssur

e

Ambient temperature(˚C) Ambient humidity(%) Ambient temperature(˚C) Ambient humidity(%)

Out

door

uni

t cu

rren

t (A

)

(kgf/F[Gauge])(MPa[Gauge])

15 2050

2560

3070

35(:) (%)

0.3

0.4

0.5

0.6

0.77.0

6.0

5.0

4.0

3.0

220V

18 32 15 2050

18 322560

3070

35(:) (%)

3

4

5

6

220V

MU-A12ND MU-A12ND


Out

door

low

pre

ssur

e

Out

door

uni

t cu

rren

t (A

)


15 2050

2560

3070

35(:) (%)

2.0

2.5

3.0

3.5

4.0

220V

18 3215 2050

2560

3070

35(:) (%)

0.4

0.5

0.6

0.7

0.8

220V

4.0

5.0

6.0

7.0

8.0

9.00.9

18 32

MU-A10ND MU-A10ND

Out

door

low

pre

ssur

e


Out

door

uni

t cu

rren

t (A

)


15 3218 20 50

2560

30 70

35(:) (%)

0.3

0.4

0.5

0.6

0.7

4

5

6

7

3

220V

15 18 2050

2560

30 70

35(:) (%)

4.0

4.5

5.0

5.5

6.0

6.5

32

220V

MU-A15ND MU-A15ND


Out

door

low

pre

ssur

e

Out

door

uni

t cu

rren

t (A

)


OB403B--1.qxp 07.6.26 10:28 AM Page 14

15

TROUBLESHOOTING8

8-1. Cautions on troubleshooting1. Before troubleshooting, check the following:

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

2. Take care the following during servicing.1).Before servicing the air conditioner, be sure to turn off the main unit first with the remote controller, and then after con-

firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel and the electronic

control P.C. board.3) When removing the electronic control P.C. board, hold the edge of the

board with care NOT to apply stress on the components.4) When connecting or disconnecting the connectors, hold the housing of the

connector. DO NOT pull the lead wires.

Lead wiring Housing point

Start

Indoor unit operates.Outdoor unit doesn't operate.

Indoor unit doesn't receive the signal from remote controller.

OPERATION INDICATORlamp on the indoor unit is flashing on and off.

Outdoor unit operates in only Test run operation.

Outdoor unit doesn't operate even in Test run operation.

Indoor unit operates, when the EMERGENCY OPERATION switch is pressed.

Indoor unit doesn't operate, when the EMERGENCY OPERATION switch is pressed.

Check room temperature thermistor.Refer to "Test point diagram and voltage".

Check of wiring diagramof outdoor unit.

Refer to "Check of remote controller and receiver P.C. board".

Left lamp2-time flash Cause:Indoor unit• Trouble of room temperature/ indoor coil thermistor

Left lamp3-time flash Cause:Indoor unit• Trouble of indoor fan motor

Check room temperature thermistor and indoor coil thermistor.Refer to "Test point diagram and voltage".

Refer to "Check of indoor fan motor".

1. Check indoor / outdoor connecting wire.2. Refer to "Check of indoor electronic control P.C. board".

Left lamp4-time flash Cause:Indoor unit• Trouble of indoor control system

Replace the indoor electronic control P.C. board.

As for indoor unit, refer to service manual OB402.

Both lamps(Left and right)Flash on and off at 0.5-second intervalsCause:Indoor unit• The horizontal vanes are not installed correctly.

Refer to "Check of installation of the horizontal vane".

8-2. Instruction of troubleshooting


OB403B--1.qxp 07.6.26 10:28 AM Page 15

16

Outdoor fanmotor (MF)

INNER PROTECTORMU-A08ND135i 5: OPEN95i 15: CLOSEMU-A15ND130i 5: OPEN83i 15: CLOSE

INNER FUSEMU-A10/12ND149i 3: OPEN

WHTREDBLK

MAINAUX.

WHTREDBLK

MAIN

AUX.

MU-A15ND

MU-A08ND

FUSE

WHTREDBLK

MAINAUX.

MU-A10/12ND

ORN

Compressor(MC)OVERCURRENTRELAYMU-A08ND150i 5: OPEN

78i 9: CLOSEINNER PROTECTORMU-A10ND150i 5: OPEN90i10: CLOSE

MU-A12ND155i 5: OPEN90i10: CLOSE

MU-A15ND155i 5: OPEN90i10: CLOSE

8-3. Trouble criterion of main parts

Part name Check method and criterion Figure

R

C

S

REDBLK

WHT

MAINAUX.

R

C

S

REDBLK

WHT

MAINAUX.

P

MU-A10/12/15ND

MU-A08ND

PP:INNER PROTECTOR

Measure the resistance between the terminals with a tester.(Coil wiring temperature -10°C ~ 40°C)

Color oflead wire

Normal

WHT-BLK

BLK-RED

102 ~ 126 "

97 ~ 120 "

MU-A15ND

132 ~ 162 "

233 ~ 286 "

MU-A08ND

338 ~ 414 "

228 ~ 280 "

MU-A10ND

275 ~ 337 "

224 ~ 276 "

MU-A12ND

Measure the resistance between the terminals with a tester.(Coil wiring temperature -10°C ~ 40°C)

Color oflead wire

Normal

MU-A12ND

1.0 ~ 2.37 "

2.0 ~ 3.56 "

MU-A15ND

1.32 ~ 1.61 "

2.06 ~ 2.51 "

C-R

C-S

MU-A08ND

3.61 ~ 4.41 "

4.93 ~ 6.01 "

MU-A10ND

2.0 ~ 2.96 "

3.0 ~ 4.25 "


OB403B--1.qxp 07.6.26 10:28 AM Page 16

17

DISASSEMBLY INSTRUCTIONS9

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

1Slide the sleeve.2Pull the terminal while pushing the locking lever.

1Hold the sleeve, and pull out the terminal slowly.

The terminal which has the locking mechanism can be detached as shown below.There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.The terminal without locking mechanism can be detached by pulling it out.Check the shape of the terminal before detaching.

<"Terminal with locking mechanism" Detaching points>

Connector

Sleeve

Locking lever

9-1. MU-A08NDOUTDOOR UNIT

OPERATING PROCEDURE PHOTOS

1. Removing the cabinet(1) Remove the screws of the top panel.(2) Remove the screws of the service panel.(3) Remove the screw of the valve cover (MU-A08ND- ).(4) Remove the screws of the cabinet.(5) Remove the screws of the front panel and motor support.(6) Remove the service panel, and remove the screw from

the inside.(7) Remove the valve cover (MU-A08ND- ).(8) Remove the top panel.(9) Remove the cabinet.

C2

C2

Photo 1

Photo 3

Screws of thetop panel

Servicepanel

Screws of theservice panel

Screws ofthe top panel

Screws ofthe cabinet

Screws of the cabinet

Photo 2

Screws of the front panel and motor support

Screws of thecabinet

Photo : MU-A08ND - C2


Screwof thevalvecover

OB403B--1.qxp 07.6.26 10:28 AM Page 17

18

Compressorcapacitor (C1)


2. Removing the electrical parts(1) Remove the service panel and the cabinet.(Refer to 1.)(2) Remove the following parts.

•Compressor capacitor (C1)•Outdoor fan capacitor (C2)•Terminal block (TB)

Photo 6

Compressor

Terminal cover

3. Removing the propeller and the outdoor fan motor(1) Remove the cabinet. (Refer to 1.)(2) Remove the propeller nut.(3) Remove the propeller .NOTE : Loose the propeller in the rotating direction for

removal.When attaching the propeller, align the mark on thepropeller and the motor shaft cut section.Set the propeller in position by using the cut on theshaft and the mark on the propeller.

(4) Remove the lead clamps and the outdoor fan motor lead wires.

(5) Remove the screws fixing the outdoor fan motor.(6) Remove the outdoor fan motor.

Photo 5

Suction pipeDischarge pipe

Compressor nuts

4. Removing the compressor(1) Remove the cabinet. (Refer to 1.)(2) Remove the relay panel.(3) Remove the soundproof felt.(4) Remove the terminal cover on the compressor.(5) Disconnect lead wires from the glass terminal of the com-

pressor.(6) Recover gas from the refrigerant circuit.NOTE : Recover gas from the pipes until the pressure gauge

shows 0 kg/cm2 (0MPa).(7) Disconnect the welded part of the discharge pipe(8) Disconnect the welded part of the suction pipe.(9) Remove the nuts fixing the compressor.(10) Remove the compressor.

Glass terminal

Photo 4 Outdoor fancapacitor (C2)

Terminal block

Lead clamp

Propeller Propeller nut

Outdoorfan motor

Set screws ofoutdoor fan motor

OB403B--1.qxp 07.6.26 10:28 AM Page 18

19



1. Removing the cabinet(1) Remove the screws fixing the top panel.(2) Remove the top panel.(3) Remove the screw fixing the service panel.(4) Pull down the service panel and remove it.(5) Remove the screws fixing the cabinet.(6) Remove the cabinet.(7) Disconnect the indoor/ outdoor connecting wire.(8) Remove the screws fixing the back panel.(9) Remove the back panel.

Photo 1

Photo 3




Photo 2


Screws of thetop panel

Servicepanel

Screw of thecabinet

Direction to remove

Hooks

Screw of theservice panel

2. Removing the electrical parts(1) Remove the service panel and the cabinet. (Refer to 1.)(2) Remove the following parts.


Photo 4

Outdoor fan capacitor (C2)

Compressor capacitor (C1)

Terminal block (TB)Photo : MU-A10ND - C1

OB403B--1.qxp 07.6.26 11:30 AM Page 19

20

Glass terminal


3. Removing the propeller and the outdoor fan motor(1) Remove the cabinet. (Refer to 1.)(2) Remove the propeller nut and the propeller.NOTE : Loose the propeller in the rotating direction for

removal.When attaching the propeller, align the mark on the propeller and the motor shaft cut section.Set the propeller in position by using the cut on the shaftand the mark on the propeller.

(3) Remove the lead clamps and outdoor fan motor lead wires.(4) Remove the screws fixing the outdoor fan motor.(5) Remove the outdoor fan motor.

Photo 5

Propeller

Propeller nut Outdoor

fan motor

Set screws of theoutdoor fan motor Hook

Relay panel

Outdoor fan motor lead wires

Set screws of theoutdoor fan motor

4. Removing the compressor(1) Remove the cabinet. (Refer to 1.)(2) Remove the screws fixing the relay panel.(3) Remove the soundproof felt.(4) Remove the terminal cover.(5) Pull out the lead wires from the glass terminal of the com-


shows 0 kg/cm2 (0MPa).(7) Disconnect the welded part of the suction pipe and

discharge pipe.(8) Remove the nuts fixing the compressor.(9) Remove the compressor.

Photo 6

Compressor

Suction pipeDischarge pipe

Compressor nuts



OB403B--1.qxp 07.6.26 10:28 AM Page 20

21


2. Removing the electrical parts(1) Remove the service panel and the cabinet. (Refer to 1.)(2) Remove the following parts.


9-3. MU-A12ND OUTDOOR UNIT

Photo 4

1. Removing the cabinet(1) Remove the screws fixing the top panel.(2) Remove the top panel.(3) Remove the screw fixing the service panel.(4) Pull down the service panel and remove it.(5) Remove the screws fixing the cabinet.(6) Remove the cabinet.(7) Disconnect the indoor/ outdoor connecting wire.(8) Remove the screws fixing the back panel.(9) Remove the back panel.

Photo 1



Photo 3 Screws of thetop panel

Servicepanel

Screw of thecabinet

Direction to remove

Hooks

Screw of theservice panel



Photo 2

Outdoorfan capacitor(C2)

Compressorcapacitor (C1)

Terminal block (TB)

OB403B--1.qxp 07.6.26 11:39 AM Page 21

22

PHOTOS

Photo 6

Photo 5

OPERATING PROCEDURE

3. Removing propeller and the outdoor fan motor(1) Remove the cabinet. (Refer to 1.)(2) Remove the propeller nut and remove the propeller.NOTE : Loose the propeller in the rotating direction for

removal.When attaching the propeller, align the mark on the propeller and the motor shaft cut section.Set the propeller in position by using the cut on theshaft and the mark on the propeller.

(3) Disconnect the connector and remove the lead clamps andoutdoor fan motor lead wires.

(4) Remove the screws fixing the outdoor fan motor.(5) Remove the outdoor fan motor.

4. Removing the compressor(1) Remove the cabinet. (Refer to 1.)(2) Remove the relay panel.(3) Remove the soundproof felt.(4) Remove the terminal cover.(5) Pull out the lead wires from the glass terminal of the com-


shows 0 kg/cm2 (0MPa).(7) Disconnect the welded part of the suction pipe and dis-

charge pipe.(8) Remove the nuts fixing the compressor and the compres-

sor.

Glassterminal

Dischargepipe

Suctionpipe

Compressor nuts

Compressor

Propeller

Propeller nut

Outdoorfan motor


Hook Relay panel

Outdoor fan motor lead wires


OB403B--1.qxp 07.6.26 10:29 AM Page 22

23


1. Removing the cabinet(1) Remove the screws of the cabinet.(2) Hold the bottom of the cabinet on both sides and remove

the cabinet.(3) Remove the screws of the service panel and remove the

service panel.(4) Remove the screw of the valve cover and remove the valve

cover. (MU-A15ND- ).C2

2. Removing the electrical parts(1) Remove the cabinet. (Refer to 1.)(2) Remove the following parts.


Photo 1

Photo 3

Photo 2

Screwsof thecabinet

Screwsof thecabinet

Screws of the servicepanel

Compressor capacitor (C1)


Outdoor fan capacitor (C2) Terminal block (TB)

Connector

3. Removing the outdoor fan motor(1) Remove the cabinet. (Refer to 1.)(2) Disconnect the connector and remove the hooked lead

wire from the fan motor.(3) Remove the propeller nut and remove the propeller.(4) Remove the screws fixing the fan motor.

Photo 4

Hook

Propeller Propeller nut

Set screws ofoutdoor fan motor

Screw of thevalve cover


OB403B--1.qxp 07.6.26 10:29 AM Page 23

24

PHOTOS

4. Removing the compressor(1) Remove the cabinet. (Refer to 1.)(2) Remove the terminal cover on the compressor.(3) Remove the electrical assembly. (Refer to 2.)(4) Remove the soundproof felt.(5) Recover gas from the refrigerant circuit.NOTE : Recover gas from the pipes until the pressure gauge

shows 0 kg/cm2 (0MPa).(6) Disconnect the welded part of the discharge pipe(7) Disconnect the welded part of the suction pipe.(8) Remove nuts fixing the compressor.(9) Remove the compressor.

Photo 5

Compressor

Dischargepipe

Suctionpipe

Compressor nuts

OPERATING PROCEDURE

Terminalcover

OB403B--1.qxp 07.6.26 10:29 AM Page 24

25

PARTS LIST (non-RoHS compliant)10

Part numbers that are circled are not shown in the illustration.

10-1. OUTDOOR UNIT STRUCTURAL PARTS,ELECTRICAL PARTS AND FUNCTIONAL PARTS

MU-A08ND

No. Part No. Part name RemarksSymbol

in WiringDiagram

Q'ty/unit

123456789

10

11121314

15

16171819202122232425

RA6N33-2R10S3R236A-6B3RUBBERS/SET

{9.52{6.35

3P4P15+ /440VAC1.5+ /440VAC{3.0x{1.4x800

3.15A20A

MFMC

TB2TB1C1C2

51C

F1F2

MU-A08ND- MU-A08ND-

1111111131

11

11

1111111111

111111113

11111

11111111111

TOP PANELMOTOR SUPPORTOUTDOOR HEAT EXCHANGERCABINETGRILLEPROPELLEROUTDOOR FAN MOTORCOMPRESSORCOMPRESSOR RUBBER SETBASEBASESTOP VALVE (GAS)STOP VALVE (LIQUID)VALVE COVERSERVICE PANELBACK PANELBACK PANEL TERMINAL BLOCKTERMINAL BLOCKCOMPRESSOR CAPACITOROUTDOOR FAN CAPACITORCAPILLARY TUBEOVERCURRENT RELAYFUSE HOLDER (F1)FUSE HOLDER (F2)FUSEFUSE

C1 C2

E02 815 297E02 336 515E02 336 630E02 815 232E02 815 521E02 336 501E02 463 301E02 781 901E02 781 506E02 781 290E02 A28 290E02 955 661E02 955 662E02 819 650E02 815 245E02 835 233E02 A28 233E02 795 374E02 796 374E02 710 353E02 897 351E02 159 936E02 955 330E07 001 241E02 735 241E02 127 382E02 735 382

1

5

8 10 119

4

12

2

3

1415

6 7

18 1619 17

13

OB403B--1.qxp 07.6.26 10:29 AM Page 25

26

10-2. OUTDOOR UNITSTRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

MU-A10ND MU-A12ND

1

2

1518 10 9

3 4 5 6 7 8

1617

19

20

111314

This figure shows MU-A12ND.

12

PARTS LIST (non-RoHS compliant)

OB403B--1.qxp 07.6.26 10:29 AM Page 26

27

E02 903 232E02 899 232E02 927 521E02 665 501E02 905 290E02 900 290E02 956 900E02 957 900E02 075 506E02 899 661E02 900 661E02 899 662E02 927 245E02 927 233E02 952 233E02 798 374E02 957 374E02 899 351E02 900 351E02 665 353E02 899 293E02 900 293E02 899 515E02 900 515E02 838 523E02 900 523E02 927 297E02 956 630E02 900 630E02 956 301E02 957 301E02 289 937E02 139 936E02 127 382E07 001 241

1

23

4

5

6

7

89

10

1112

13

14

15

16

17

18

19

20

21

2223

RH145NHNTRH174NHNT3RUBBERS/SET{9.52{12.7{6.35

3P3P1.8µF/440VAC2.0µF/440VAC25µF/450VAC

RA6N21 -RA6N30 -{3.0✕ {1.6✕ 500{3.0✕ {1.6✕ 7503.15A

MCMC

TB1TB2C2C2C1

MFMF

F

1

111

1

31

111

111

11

1

1

11

1

1

11

111

1

13

111

111

11

1

1

11

1

1

111

Symbolin WiringDiagram

Q'ty/unit

RemarksPart No.No. Part Name

CABINETCABINETGRILLEPROPELLERBASEBASECOMPRESSORCOMPRESSORCOMPRESSOR RUBBER SETSTOP VALVE (GAS)STOP VALVE (GAS)STOP VALVE (LIQUID)SERVICE PANELBACK PANELBACK PANELTERMINAL BLOCKTERMINAL BLOCKOUTDOOR FAN CAPACITOROUTDOOR FAN CAPACITORCOMPRESSOR CAPACITORSEPARATORSEPARATORMOTOR SUPPORTMOTOR SUPPORTCONDENSER NETCONDENSER NETTOP PANELOUTDOOR HEAT EXCHANGEROUTDOOR HEAT EXCHANGEROUTDOOR FAN MOTOROUTDOOR FAN MOTORCAPILLARY TUBECAPILLARY TUBEFUSEFUSE HOLDER

MU-A10ND- C1 MU-A12ND- C1

MU-A10ND MU-A12ND10-2. OUTDOOR UNIT

STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS



OB403B--1.qxp 07.6.26 10:29 AM Page 27

28

MU-A15ND10-3. OUTDOOR UNIT

STRUCTURAL PARTS,ELECTRICAL PARTS AND FUNCTIONAL PARTS

1

4

16

2

17 15 14

13

6 7 98

18

5 10 11

No. Part No. Part Name RemarksSymbol

in WiringDiagram

Q'ty / unit


3RUBBERS/SETRH207NRAT

{12.7{ 6.35

3P3P3.0+/440VAC30+/440VACRA6V60 -{3.0x{1.8x700

3.15A

1

2

345678

9

10111213141516171819202122

1

1

1111311

11

1111111111

1

1111131

11111111111111

E02 817 233E02 A27 233E02 561 630E02 A27 630E02 817 232E02 817 521E02 141 501E02 139 515E02 075 506E02 783 901E02 816 290E02 A17 290E02 140 661E02 139 662E02 819 650E02 817 245E02 795 374E02 798 374E02 895 351E02 900 353E02 818 301E02 077 937E02 895 383E02 127 382E07 001 241

BACK PANELBACK PANELOUTDOOR HEAT EXCHANGEROUTDOOR HEAT EXCHANGERCABINETGRILLEPROPELLERMOTOR SUPPORTCOMPRESSOR RUBBER SETCOMPRESSORBASEBASESTOP VALVE (GAS)STOP VALVE (LIQUID)VALVE COVERSERVICE PANELTERMINAL BLOCKTERMINAL BLOCKOUTDOOR FAN CAPACITORCOMPRESSOR CAPACITOROUTDOOR FAN MOTORCAPILLARY TUBESURGE ABSORBERFUSEFUSE HOLDER

MC

TB2TB1C2C1MF

F

3

12Part numbers that are circled are not shown in the illustration.


OB403B--1.qxp 07.6.26 10:29 AM Page 28

29

RoHS PARTS LIST (RoHS compliant)11


11-1. OUTDOOR UNIT STRUCTURAL PARTS,ELECTRICAL PARTS AND FUNCTIONAL PARTS

MU-A08ND

No. Part No. Part name RemarksSymbol

in WiringDiagram

Q'ty/unit

123456789

10

11121314

15

16171819202122232425

RA6N33-2R10S3R236A-6B3RUBBERS/SET

{9.52{6.35

3P4P15+ /440VAC1.5+ /440VAC{3.0x{1.4x800

3.15A20A

MFMC

TB2TB1C1C2

51C

F1F2

MU-A08ND- MU-A08ND-

1111111131

11

11

1111111111

111111113

11111

11111111111

TOP PANELMOTOR SUPPORTOUTDOOR HEAT EXCHANGERCABINETGRILLEPROPELLEROUTDOOR FAN MOTORCOMPRESSORCOMPRESSOR RUBBER SETBASEBASESTOP VALVE (GAS)STOP VALVE (LIQUID)VALVE COVERSERVICE PANELBACK PANELBACK PANEL TERMINAL BLOCKTERMINAL BLOCKCOMPRESSOR CAPACITOROUTDOOR FAN CAPACITORCAPILLARY TUBEOVERCURRENT RELAYFUSE HOLDER (F1)FUSE HOLDER (F2)FUSEFUSE

C1 C2

E12 815 297E12 336 515E12 336 630E12 815 232E12 815 521E12 336 501E12 463 301E12 781 901E12 781 506E12 781 290E12 A28 290E12 955 661E12 955 662E12 819 650E12 815 245E12 835 233E12 A28 233E12 795 374E12 796 374E12 710 353E12 897 351E12 159 936E12 955 330E17 001 241E12 735 241E12 127 382E12 735 382

GGGGGGGGGGGGGGGGGGGGGGGGGGG

Ro

HS

1

5

8 10 119

4

12

2

3

1415

6 7

18 1619 17

13

OB403B--1.qxp 07.6.26 10:29 AM Page 29

30

11-2. OUTDOOR UNITSTRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

MU-A10ND MU-A12ND

1

2

1518 10 9

3 4 5 6 7 8

1617

19

20

111314

This figure shows MU-A12ND.

12

RoHS PARTS LIST (RoHS compliant)

OB403B--1.qxp 07.6.26 10:29 AM Page 30

31

Part No.

E12 903 232E12 899 232E12 927 521E12 665 501E12 905 290E12 900 290E12 956 900E12 957 900E12 075 506E12 899 661E12 900 661E12 899 662E12 A45 662E12 927 245E12 927 233E12 952 233E12 798 374E12 957 374E12 899 351E12 900 351E12 665 353E12 899 293E12 900 293E12 899 515E12 900 515E12 838 523E12 929 523E12 900 523E12 927 297E12 956 630E12 D02 630E12 900 630E12 956 301E12 957 301E12 289 937E12 746 936E12 139 936E12 127 382E17 001 241

1

23

4

5

6

7

8

9

10

1112

13

14

15

16

17

18

19

20

21

2223

RH145NHNTRH174NHNT3RUBBERS/SET{9.52{12.7{6.35{6.35

3P3P1.8µF/440VAC2.0µF/440VAC25µF/450VAC

RA6N21 -RA6N30 -{3.0✕ {1.6✕ 500{3.0✕ {1.6✕ 850{3.0✕ {1.6✕ 7503.15A

MCMC

TB1TB2C2C2C1

MFMF

F

1

111

1

31

1

11

111

11

1

1

11

1

1

11

111

1

13

11

1

111

11

1

1

11

1

1

111

Symbolin WiringDiagram

Q'ty/unit

RemarksNo. Part Name

CABINETCABINETGRILLEPROPELLERBASEBASECOMPRESSORCOMPRESSORCOMPRESSOR RUBBER SETSTOP VALVE (GAS)STOP VALVE (GAS)STOP VALVE (LIQUID)STOP VALVE (LIQUID)SERVICE PANELBACK PANELBACK PANELTERMINAL BLOCKTERMINAL BLOCKOUTDOOR FAN CAPACITOROUTDOOR FAN CAPACITORCOMPRESSOR CAPACITORSEPARATORSEPARATORMOTOR SUPPORTMOTOR SUPPORTCONDENSER NETCONDENSER NETCONDENSER NETTOP PANELOUTDOOR HEAT EXCHANGEROUTDOOR HEAT EXCHANGEROUTDOOR HEAT EXCHANGEROUTDOOR FAN MOTOROUTDOOR FAN MOTORCAPILLARY TUBECAPILLARY TUBECAPILLARY TUBEFUSEFUSE HOLDER

MU-A10ND- C1

MU-A12ND- C1

MU-A10ND- C2

1

111

1

31

111

111

1

1

1

1

1

1

1

1

11

GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG

Ro

HS

MU-A10ND MU-A12ND11-2. OUTDOOR UNIT

STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS



OB403B--2.qxp 07.6.26 10:30 AM Page 31

32

MU-A15ND11-3. OUTDOOR UNIT

STRUCTURAL PARTS,ELECTRICAL PARTS AND FUNCTIONAL PARTS

1

4

16

2

17 15 14

13

6 7 98

18

5 10 11

No. Part No. Part Name RemarksSymbol

in WiringDiagram

Q'ty / unit


3RUBBERS/SETRH207NRAT

{12.7{ 6.35

3P3P3.0+/440VAC30+/440VACRA6V60 -{3.0x{1.8x700

3.15A

1

2

345678

9

10111213141516171819202122

1

1

1111311

11

1111111111

1

1111131

11111111111111

E12 817 233E12 A27 233E12 561 630E12 A27 630E12 817 232E12 817 521E12 141 501E12 139 515E12 075 506E12 783 901E12 816 290E12 A17 290E12 140 661E12 139 662E12 819 650E12 817 245E12 795 374E12 798 374E12 895 351E12 900 353E12 818 301E12 077 937E12 895 383E12 127 382E17 001 241

BACK PANELBACK PANELOUTDOOR HEAT EXCHANGEROUTDOOR HEAT EXCHANGERCABINETGRILLEPROPELLERMOTOR SUPPORTCOMPRESSOR RUBBER SETCOMPRESSORBASEBASESTOP VALVE (GAS)STOP VALVE (LIQUID)VALVE COVERSERVICE PANELTERMINAL BLOCKTERMINAL BLOCKOUTDOOR FAN CAPACITORCOMPRESSOR CAPACITOROUTDOOR FAN MOTORCAPILLARY TUBESURGE ABSORBERFUSEFUSE HOLDER

MC

TB2TB1C2C1MF

F

GGGGGGGGGGGGGGGGGGGGGGGGG

Ro

HS

3

12Part numbers that are circled are not shown in the illustration.


OB403B--2.qxp 07.6.26 10:30 AM Page 32

33

OPTIONAL PARTS12

C1

C1

C2

C1

C2

C2

C2

MAC-MS0905F

MAC-MF1305F

5m

5m

[6.35 (1/4)

[27

[31

[21

[27

9.52 (3/8)

12.7 (1/2)

MU-A08ND-MU-A08ND-MU-A10ND-MU-A10ND-MU-A12ND-MU-A15ND-MU-A15ND-

Pipe length Cross-sectionPart No.Model A-Gas B-Liquid

Pipe size O.D mm (in.)Insulation

DC

��

REFRIGERANT PIPESThe air conditioner has flared connections its indoor and outdoor sides.Please use the optional extension pipe as follows.

OB403B--2.qxp 07.6.26 10:30 AM Page 33

34

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35

OB403B--2.qxp 07.6.26 10:30 AM Page 35

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

CC Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD.Distributed in Jul. 2007. No.OB403 REVISED EDITION-B 7Distributed in Oct. 2005. No.OB403 REVISED EDITION-A 6Reprinted in Apr. 2005. No.OB403 100Distributed in Apr. 2005. No.OB403 6Made in Japan

New publication, effective Jul. 2007Specifications subject to change without notice.

TM

OB403B--2.qxp 07.6.26 0:07 PM Page 36

Documents

No. OB403 SERVICE MANUAL MU-A08ND- MU-A10ND- …nonul.mylinkdrive.com/files/MU-A08~15ND_Service... · cc MU-A15ND 4.0 1.8 2280 35 5.62 0.5 2.97 RH207NRAT 1000 C-R 1.50 ... MU-A12ND