SPECIFICATIONS..............................................................................................................................................2EXTERNAL DIMENSIONS.................................................................................................................................3WIRING DIAGRAMS..........................................................................................................................................4ELECTRICAL PARTS........................................................................................................................................5MICROCOMPUTER CONTROL SYSTEM.........................................................................................................6PRINTED WIRING DIAGRAM............................................................................................................................7FUNTIONS..........................................................................................................................................................8TROUBLESHOOTING......................................................................................................................................12REFRIGERATION CYCLE AND PERFORMANCE CURVES..........................................................................15DISASSEMBLING PROCEDURE.....................................................................................................................17REPLACEMENT PARTS LIST..........................................................................................................................27

SERVICE MANUAL

SPLIT SYSTEMROOM AIR CONDITIONERINDOOR UNITAH-MP20 OUTDOOR UNITAU-MP20

SHARP CORPORATION

CONTENTS

OUTDOOR UNITAU-A18FV

AU-A24FV

1

CHAPTER 1. PRODUCT SPECIFICATION[1] SPECIFICATION

INDOOR UNITAH-MP20

High 44Mid. 37Low 35

High 17.5Med. 13.4Low 11.9

Cross flow fan

Refrigerant coupling Flare typeRefrigerant tube size Gas, Liquid 1/2" , 1/4"

mm O.D 20

Width 1040 (1155)Height 325 (300)Depth 220 (385)

19 (21)

2

(at cooling)m3/min.

–dB(A)

Noise level (at cooling)

Fan system

dB(A) 53dB(A) –

Net weight kg 55 (59)

Air filters Polypropylene net (Washable)Net dimensions mm 890 (1020)

mm 645 (735)mm 327 (398)

Safety device Compressor : Internal protector Fan motor : Thermal protector(Internal)Fuse, Micro computer control

Fan Propeller fan Connections

Drive Direct drivem3/min. 44m3/min.

Air flow quantity

Refrigerant system Evaporator Louver fin and Grooved tube typeCondenser Louver fin and Grooved tube typeControl Capillary tubeRefrigerant volume R22 1300g

Power factor % 92 - 98Compressor Type Hermetically sealed rotary type

Model PH31VNETOil charge 670cc ,DIAMOND MS32(N-1)

A 7.9Rated input * W 1720

50Rated voltage V 220

–

Phase SingleElectrical data

OUTDOOR UNITAU-MP20

Cooling capacity kW 5.30

Drain pipingOthers

1. AH-MP20 / AU-MP20

ITEMS

Moisture removal Liters/h

Rated frequency Hz

Rated current

φ

[2] EXTERNAL DIMENSION

3

1. Indoor unit (AH-MP20)

2. Outdoor unit (AU-MP20)

4

Indoor Unit (AH-MP20)

Outdoor Unit (AU-MP20)

[3] WIRING DIAGRAM

CC097

UNIT TO UNIT CORD

CHAPTER 2. ELECTRIC CIRCUIT[1] ELECTRIC PARTS

1. INDOOR UNIT (AH-MP20)PART NO. PART NAME ITEM SPECIFICATION

1 Terminal Board Rating 300V,25A

2 Fan motor Capacitor Rating 450V, 2µF

3 Relay-1 Rating AC250V,20A(RY1) Coil Volt: 12V

4 Printed Wiring Board Material Paper Base Phenolic Resin (UL 94V-0)

5 Transformer Rating Pri 220-240VAC

6 Fan motor Rating 220 - 240VAC 50Hz 41W 4-PoleType MLA999Thermal Protector Cut off 135 10 C(Internal)

7 Power Supply Cord Rating 3 x 1.5 mm2Type H05VV-F

8 Louver Motor Rating DC12VType 24BYJ48

1. OUTDOOR UNIT (AU-MP20)PART NO. PART NAME ITEM SPECIFICATION

1 Terminal Board Rating 300V,25A

2 Fan motor Capacitor Rating 450V, 3µF

3 Running Capacitor Rating 400V, 45µF

4 Compressor Rating AC220V 50Hz 1730WType PH31VNET

5 Protector Rating -Type (INTERNAL)

6 Fan motor Rating 220 - 240VAC 50Hz 71W 6-PoleType MLA002Thermal Protector Cut off 135 5 C(Internal)

5

± °

± °

[2] MICRO-COMPUTER CONTROL SYSTEM 1. Electronic Control Diagram

Indoor unit (AH-MP20)

6

MOD

E

13K

R37

L2

NCNC

56

L 19.1K

R45

1/2W

10K

D14

25V47∝C29

+

NF1

6.8K

6.8K

R41100

L1

SSR1

C311W 275V0.033∝

Q8Q7

Q6 Q5

JP21

3131

NR1

CN9

THER

MOS

TAT

INTE

RNAL

CN8

CN7

CN6

CN5

CN3

CN2

CN1

12

31

CLUS

TER

R35

3.3K

R40

R39

10K

CLEA

NING

SWIT

CH 1

SWIT

CH 2

CLEA

NING

31

D8 D9

32

12

332

2

0.01

∝

C22

16V

2

0.01

∝C1016V

22K

R6 20K

Q21

R522

KR4

R27

21/

2W9

470

R30

SSR2

3

12V

5V

109

25V

C24

SW10

121

1 2

8

IC4

10K

R29R281.8K

BZ1

RY1

SSR1

1/2W

470

IC5

89

Q1

16V

220∝

10K(

F)

+D6

25V

0.1∝

1245 3

MOT

ORLO

UVER

321 54 1 2 3

HOLE IC

FAN

MOT

OR

23

JP3

JP2

JP1

NC

MB89

537A

1 IC6

3

10K

13K

13K

25V0.1∝

1∝50V

IC1

(PAT

TERN

SID

E)

400V

0.01

∝16

VJP5

JP4

1K

0.01∝

OSC1

FRONT

P21

P22

P23

P24

P25

P26

P27

X1 X0M

OD1

MOD

0RS

T

32 31 30 29 28 27 26 25 24 23 22 21 20

Vcc

123456789

10111213141516171819

P45P46P47AN0AN1AN2AN3AN4AN5AN6AN7

AVR

P60P61P62P63P64

P31

P32

P33

P34

P35

P36

P37

P40

P41

P42

P43

P44

52 53 54 55 56 57 58 59 60 61 62 63 64

P30NCP00P01P02P03P04P05P06P07P10P11P12P13P14P15P16P17P20

495051

33343536373839404142434445464748

AVcc

AVss

Vss

50V

1000

p+

680

10K10K

10∝16V 16V

10∝

10k(F)

10K(F)

4321TH

2PI

PE T

EMP

15k !

(25ы

C).

TH1

PIPE

TEM

P10

k!(2

5ыC)

.

FAN

MOT

OR

2∝

1 3 5

2.7K

(F)

D7

+ 35V

1000

∝50

V0.

1∝

7812

IC2

+ 25V

47∝

7805

0.1∝

IC3

25V

10V 10

0∝

+

C7

D1?4

GND

22.6

K(F)

3.3K

45

IC8

123

876

0.1∝

25V

16V

0.01

∝

TR1

C1

C2

C3

C4C5

C6C8

C9

C11

C13

C14

C15

C17

C18

C19

C20

C21

C23

C25

R7R8

R9

R10

R13

R14

R15

R16

R18

R19

R20

R21

R22

R23

R24

R25

R26

R32 R34

10K

16V

16V

16V

0.01

∝0.

01∝

0.01

∝

6.8K R12

47K R11

10M

Hz

JP10

JP11

JP12

JP13

JP18

10K10K

0.01

∝16

V

0.01∝ 16V

R17

3.3K

13K

C27

C12

SW1

: AUX

.(TES

T RU

N)

C1625V 0.1∝

1

R31 R33

+ +

C26

321 1

BCN1

2 3 4 5 6 7 8

R37

6 71 3 5

1K(F

)

1

0.1∝

D12

3

R108

10

32

(TIM

ER)

LED1

02

LED1

01(O

PERA

TION

)

1

12

BLGR

LED1

07(C

LUST

ER)

13

42

56

9R1

07

(FAN

L)

(FAN

M)

(FAN

H)

(FAN

AUT

O)LE

D106

LED1

05

LED1

04

LED1

03

3K

2.7K

R102

R101

1/2W

1/2W

C102

C101

0.1∝

25V

33∝

10V+

IC10

1

BCN1

01

R103

R104

R105

R106

620

620

1 2 3 1 8765432

620

620

1/2W

1/2W

56

CN10

CN10

3

BCN1

02CN

102

CN10

1

275V

275V

0.1∝

0.1∝

275VC28

86SSR2

2W 2WR1 R2

NCNCNCNC

JP9

JP8

JP7

JP19

DEIC

E 1

DEIC

E 2

DRY

FAN

PIPE

1PI

PE 2

NONE

NONE

NONE

NONE

JP7

JP8

JP9

JP10

JP11

JP12

JP13

TEST

NONE

JP6

NONE

15K

15K

15K

JP18

JP19

LOUV

OUT

FAN

CLUS

TER

ER

R19

R21

R23

FAN2

FAN1

HEAT

COOL

MOD

ER3

8

R38

ONPWR

LESS

WIR

EATSW

E-KE

EPHO

TDE

F.

SYM

BOL

I

JP2

JP3

JP4

JP5

JP1

IN OUT

RY1

WPE

1

T25

0V3A

1 N

BOAR

DTE

RMIN

AL

1 N

PHAS

ESI

NGLE

SUPP

LYPO

WER

TERM

INAL

BOAR

D

ABL

BKBR

UNIT

OUTD

OOR

TO

NONE

NONE

NONE

47

CT1 BL

BL

2. PRINTED WIRING DIAGRAM 1 Indoor (AH-MP20)

7

DHCL

CALCM

CAHCH

8

2. OPERATION MODES 2.1. COOL operation

1. TEMPERATURE CONTROL CHARACTERISTIC 1.1. COOL operation

CHAPTER 3. FUNCTIONS[1] FUNCTION

In the "COOL" mode, the thermostat circuit is controlled by five thermostat lines (C1 thru C5).

18 32Preset temperature (C )

1.2. DRY In the "DRY" mode, the thermostat circuit is controlled by three thermostat lines (D1 thru D3).

The preset temperature ranges from 18 C to 32 C. When the roomtemperature is below 18 C, the preset temperature is set to 18 C,and when the room temperature is over 32 C, the presettemperature is set to 32 C.Dry operation is divided into three zones (Cooling zone,Dehumidifying zone and Circulating zone) by thermostat lines (D1 toD3), and the compressor and the fan motor are controlled in eachzone as shown in Table.

"DL"Cooling zone ON "DH"Dehumidifying zone ON

2.2. DRY On the switch on, the compressor always starts to operate for 2 minutes with fan speed "DL".The microcomputer reads the room temperature 2 minutes after this first compressor operation.This room temperature is set as the preset temperature

t ti ll

Circulating zone OFF "DL" or OFF

18 32Preset temperature (C )

3. FAN SPEED

18 32Preset temperature (C )

Compressor Fan speed

Fan speeds are given by the indoor fan motor, "DL"~"HH" which are available in the following operation mode.

Fanspeed

Fan switch Fan switch(AUTO)

AH-MP20(r.p.m)The compressor turns on or off, at the thermostat lines C3 and C4.

The outdoor fan motor is also controlled with the compressor. DL—

COOL SOFT — 800

COOL LOW—

8409801020

—COOL

18 32Preset temperature (C )

COOL HIGH — 1170

800890

— DRY

° °

°°

°°

°

°

°

°

Compressor Valve Coil

Cooling ON OFF

9

5. TIMER

OU

Circulat-ing

OFF

4. TEST OUTPUTS IN EACH OPERATION MODEIf the "AUX" button on the unit is pressed for 5 seconds or more during operation, cool test operation starts. The operation LED (red) flickersduring test run.

Mode Outdoor

Fan MotorIndoor

Fan MotorOFFO ONOFF

Cooling ON ONOFF ON

L/UL}

oDehu-midiflying

ON ON UL/DON

OFF

5.1. ON/OFF TimerCirculat-ing

OFF OFF D/OFF OFFWhen the unit operates during one hour after the OFF-time is set, ther-

To put the system in the heating test run mode, start the cooling operation and select the heating mode on the remote control. In cool and heat mode continuous compressor on operation is performed. In dry mode the operation is in dehumidifiying zone. In fan only mode the indoor fan motor runs continusly.

mostart setting is automatically shifted ( in operation and dry operation). When the ON-timer is set in cooloperation, operation starts before 0 to 30 minutes(depends on the roomtemperature) so that preset temperature is obtaind at set time.

POWER ON STARTIf the connecting wire "POWER ON" (JP99) is cut on the PWBass'y, when the power is supplied by turning on a circuit breaker,the air conditioner automatically starts of operation in "AUTO".5.2. hour timer

When ONE-HOUR timer is set, the unit turns off automatically after onehour. The one hour timer operation has priority over other timeoperation, such as the TIMER ON and TIMER OFF. If the ONE-HOURTIMER button is pressed again during operation, the unit will operateadditionally for another one hour.

AUTOMATIC AIR CONDITIONINGWhen automatic air conditioning is selected, the operation mode andpreset temperature are set automatically according to the roomtemperature on starting operation.

(Refer to Printed Wiring Board.)

AUTO RESTART 11.1. When JP5 is ONPower failuer occurs during operation, the unit will restart in the same operation mode as before recovery.

11.2. When JP5 is OFF

25°C24°C > 26°C 24°C

Room temperatureat operation start

Operation Mode Preset Temperature

Above 28°C 26°C

Auto restart function is not available.

AUTOMATIC FAN SPEEDWhen the automatic fan speed is selected in cool operation, the fanspeed is automatically changed by the thermostat lines C1 to C3 incool operation.

Below 24°C DRY Room temperature atoperation start

When DRY mode is selected by the micro computer with AUTOoperation, the fan speed lamps on the indoor unit panel will indicateidentically with the fan speed symbols on the remote control dispaly, asthe FAN speed setting is changed accordingly. Despite,as the FANspeed setting is changed accordingly. Despite, the actual fan speed willnot change, as it is determined autometically by the micro computer.

26°C > 28°C COOL

[2] TEST MODEKeep pushing the "AUX." buttons and supply the power, the system will go to the test mode. In this mode, the output of operation is switched by pushing the ""AUX." button in the unit or the "OI" button in the remote controller. Normal outputs are shown in Table.

2.1 PLASMA CLUSTERPlasma cluster ion modeSSR2 : ONRelay (Cluster unit inside) : OFFMinus ion modeSSR2 : ONRelay (Cluster unit inside) : ON

1) Cluster generator checking (STEP 1)Time LED

ON OFF(Yellow)

Judgement Normal Failure (Generator OK) (Check circuit)

[3] DIAGNOSIS PROCEDURE

11

When the louver unit is not properly installed, all lamps on the indicator panel will blink operation are all stop and Remote signal is not accept.

Timing chart of Timer LED and Operation LED of DIAGNOSIS PROCEDURE.When "OI" button the remote controller or "AUX." button in the unit is pushed, the unit is free from DIAGNOSIS PROCEDURE

When indoor fan motor is out of order or compressor lock occurs, indoor fan motor, outdoor fan motor, and louver are all stopped and the operation LED(red) turns on or off synchronously with the timimg of the timer LED.When the thermistor for room temperature or pipe temperature is open or short state, the operation LED turns on or off synchrnoously with the timing of the timer LED by pushing continously for more than 5 seconds "AUX." button during suspension of operation.

CHAPTER 4. TROUBLESHOOTING

12

13

satl

Text Box

14

CHAPTER 5. REFRIGERANTION CYCLE AND PERFORMANCE CURVES

O.D I.D L3.5 2.0 80

15

Capillary tube

[1] REFRIGERANT CYCLE

1 – 14

16

[2] PERFORMANCE CURVES

MODEL: AH-MP20

[1] INDOOR UNIT

1. Disassembling procedure of the indoor unit

1) Open the open panel, remove 2 Air Filters. 4) Remove the screw fixing the Cord holder.

2) Open the Louver frame, unlooks the hooks, pull the unit. 5) Close the Open panel. pushing the nail of the Front panel, and

lift the Front panel up.

6) Remove the unit-to-unit wiring from the Terminal board.

3) Remove 6 screws fixing the Front panel.

7) Remove a screw fixing the Control box cover. 10) Remove the Thermistor of the Evaporator.

11) Remove Connector.

8) Cut the fixing band and remove the Cover B.

12) Cut the fixing band and remove the Holder.

9) Remove a screw fixing the ground wire.

18

13) Remove 2 screws fixing the Control box and remove it. 16) Remove 3 screws fixing the Evaporator.

17) Remove the Evaporator from the Cabinet.

14) Remove a screw fixing the drain pan and pull Drain pan

toward you.

18) Remove 4 screws fixing the Side cover R, and pull the -

Cross flow fan

19) Loose a screw fixing Cross flow fan.

15) Remove the Drain cover from the Evaporator

19

2. The Electric Control box.

1) Remove the screw fixing the Receiving filter. 4) Remove a screw fixing the Cord holder and 2 screw

fixing the Terminal board.

2) Remove the 2 Switch and Photo detector unit.

5) Remove 2 screws fixing the Transformer and pull the

Control board unit.

3) Remove a screw fixing the Cord holder.

20

3. The Drain pan and related.

1) Remove the screw fixing the Drain pan on both side.

2) Turn left the Drain hose.

21

4. The Louver frame unit and related

1) Remove the screw fixing the frame guide on both side 3) Remove the connector of louver motor and take off the

and take off the louver unit. wire and holder.

4) Put the one of the vertical louver.

2) Remove 2 screws fixing cover-l and cover-r and take off them.

22

5. How to remove the display cover

1) Put the center of the front panel under the display cover.

2) Side it to one side.

6. How to remove the hi voltage unit.

1) Remove 2 screws fixing holder.

2) Take off the high voltage unit ass'y from the holder. 3) Remove the connector of high voltage unit ass'y.

23

MODEL: AU-MP20

[2] OUTDOOR UNIT

1. Disassembling procedure of the control box

1) Loose 3 screws fixing the control cover. 5) Loose 1 screw fixing the cabinet (rear side).

2) Loose 1 screw fixing the side cover. 6) Loose 3 screw fixing the cabinet (right side).

3) Loose 8 screws fixing the side cover R. 7) Loose 1 screw fixing the cabinet (front side).

4) Loose 2 screws fixing the cabinet. 8) Loose 7 screws fixing the rear cabinet.

24

9) Loose 1 screw fixing the rear cabinet (left side). 12) Remove the terminal cover.

10) Cut nylon band. 13) Remove 3 terminal.

11) Loose 1 screw fixing the control box. 14) Loose 3 screws fixing the bulkhead.

25

2. Disassembling procedure of the fan

1) Loose the fan nut and fan can take out.

2) Loose 2 screw fixing the fan motor angle. 3) Cut the nylon band and loose 4 screws fixing the fan motor

26