Page 1
SERVICE MANUAL
SPLIT SYSTEM
ROOM AIR CONDITIONER
INDOOR UNIT
AH-MP20
OUTDOOR UNIT
AU-MP20
SPECIFICATIONS..............................................................................................................................................2
EXTERNAL DIMENSIONS.................................................................................................................................3
WIRING DIAGRAMS..........................................................................................................................................4
ELECTRICAL PARTS........................................................................................................................................5
MICROCOMPUTER CONTROL SYSTEM.........................................................................................................6
PRINTED WIRING DIAGRAM............................................................................................................................7
FUNTIONS..........................................................................................................................................................8
TROUBLESHOOTING......................................................................................................................................12
REFRIGERATION CYCLE AND PERFORMANCE CURVES..........................................................................15
DISASSEMBLING PROCEDURE.....................................................................................................................17
REPLACEMENT PARTS LIST..........................................................................................................................27
SHARP CORPORATION
CONTENTS
1
Page 2
CHAPTER 1. PRODUCT SPECIFICATION
[1] SPECIFICATION
INDOOR UNIT
AH-MP20
High 44
Mid. 37
Low 35
High
17.5
Med. 13.4
Lo
w 11.9
Cross flow fan
Refrigerant coupling
Flare type
Refrigerant 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) 53
dB(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 drive
m3/min.
44
m3/min.
Air flow quantity
Refrigerant system Evaporator Louver fin and Grooved tube type
Condenser Louver fin and Grooved tube type
Control Capillary tube
Refrigerant volume R22 1300g
Power factor % 92 - 98
Compressor Type Hermetically sealed rotary type
Model PH31VNET
Oil charge 670cc ,DIAMOND MS32(N-1)
A 7.9
Rated input * W 1720
50
Rated voltage V 220
–
Phase Single
Electrical data
OUTDOOR UNIT
AU-MP20
Cooling capacity kW 5.30
Drain piping
Others
1. AH-MP20 / AU-MP20
ITEMS
Moisture removal Liters/h
Rated frequency Hz
Rated current
φ
Page 3
[2] EXTERNAL DIMENSION
3
1. Indoor unit (AH-MP20)
2. Outdoor unit (AU-MP20)
Page 4
4
Indoor Unit (AH-MP20)
Outdoor Unit (AU-MP20)
[3] WIRING DIAGRAM
CC097
UNIT TO UNIT CORD
Page 5
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, 2
µF
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-Pole
Type
MLA999
Thermal Protector
Cut off 135 10 C
(Internal)
7
Power Supply Cord Rating
3 x 1.5 mm2
Type
H05VV-F
8
Louver Motor Rating
DC12V
Type
24BYJ48
1. OUTDOOR UNIT (AU-MP20)
PART NO. PART NAME ITEM
SPECIFICATION
1
Terminal Board Rating
300V,25A
2
Fan motor Capacitor Rating
450V, 3
µF
3
Running Capacitor Rating
400V, 45
µF
4
Compressor Rating
AC220V 50Hz 1730W
Type
PH31VNET
5
Protector Rating
-
Type
(INTERNAL)
6
Fan motor Rating
220 - 240VAC 50Hz 71W 6-Pole
Type
MLA002
Thermal Protector
Cut off 135 5 C
(Internal)
5
±
°
±
°
Page 6
[2] MICRO-COMPUTER CONTROL SYSTEM
1. Electronic Control Diagram
Indoor unit (AH-MP20)
6
MODE
13K
R37
L2
NC
NC
56
L 1
9.1K
R45
1/2W
10K
D14
25V
47
∝
C29
+
NF1
6.8K
6.8K
R41
100
L1
SSR1
C311W275V
0.033
∝
Q8 Q7
Q6
Q5
JP21
3
131
NR1
CN9
THERMOSTAT
INTERNAL
CN8
CN7
CN6
CN5
CN3
CN2
CN1
1
23
1
CLUSTER
R35
3.3K
R40
R39
10K
CLEANING
SWITCH 1
SWITCH 2
CLEANING
31
D8D9
32
1
2
3
3
2
2
0.01
∝
C22
16V
2
0.01∝
C10
16V
22K
R6
20K
Q2
1
R5
22K
R4
R27
2
1/2W
9
470
R30
SSR2
3
12V
5V
10
9
25V
C24
SW101
2
11
2
8
IC4
10K
R29
R28
1.8K
BZ1
RY1
SSR1
1/2W 470
IC5
8
9
Q1
16V
220∝
10K(F)
+
D6
25V
0.1∝
1
2
453
MOTOR
LOUVER
32154
123
HOLE
IC
FAN
MOTOR
2
3
JP3
JP2
JP1
NC
MB89537A
1
IC6
3
10K
13K
13K
25V
0.1
∝
1
∝
50V
IC1
(PATTERN SIDE)
400V
0.01∝16V
JP5
JP4
1K
0.01
∝
OSC1
F
R
O
N
T
P21
P22
P23
P24
P25
P26
P27X1X0
MOD1
MOD0
RST
32313029282726252423222120
Vcc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
P45
P46
P47
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
AVR
P60
P61
P62
P63
P64
P31
P32
P33
P34
P35
P36
P37
P40
P41
P42
P43
P44
52535455565758596061626364
P30
NC
P00
P01
P02
P03
P04
P05
P06
P07
P10
P11
P12
P13
P14
P15
P16
P17
P20
49
50
51
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
AVcc
AVss
Vss
50V
1000p
+
680
10K 10K
10
∝
16V16V
10
∝
10k
(F)
10K
(F)
432
1
TH2
PIPE TEMP
15k
!
(25ыC).
TH1
PIPE TEMP
10k
!
(25ыC).
FAN
MOTOR
2∝
135
2.7K(F)
D7
+
35V
1000∝
50V
0.1∝
7812
IC2
+
25V
47∝
7805
0.1∝
IC3
25V
10V
100∝
+
C7
D1?4
GND
22.6K(F)
3.3K
4
5
IC8
123
876
0.1∝
25V
16V 0.01∝
TR1
C1
C2
C3
C4
C5
C6 C8
C9
C11
C13
C14
C15 C17
C18
C19
C20
C21
C23
C25
R7
R8
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
47KR11
10MHz
JP10
JP11
JP12
JP13
JP18
10K
10K
0.01∝16V
0.01∝16V
R17
3.3K
13K
C27
C12
SW1 : AUX.(TEST RUN)
C16
25V0.1
∝
1
R31R33
+
+
C26
321
1
BCN1
2345678
R37
6
7
135
1K(F)
1
0.1∝
D12
3
R108
10
32
(TIMER)
LED102
LED101
(OPERATION)
1
12
BL
GR
LED107
(CLUSTER)
134256
9
R107
(FAN L)
(FAN M)
(FAN H)
(FAN AUTO)
LED106
LED105
LED104
LED103
3K
2.7K
R102
R101
1/2W
1/2W
C102
C101
0.1∝
25V
33∝
10V
+
IC101
BCN101
R103
R104
R105
R106
620
620
123
1
8765432
620
620
1/2W
1/2W
56
CN10
CN103
BCN102
CN102
CN101
275V
275V
0.1
∝
0.1
∝
275V C28
8
6
SSR2
2W
2W
R1
R2
NC
NC
NC
NC
JP9
JP8
JP7
JP19
DEIC
E 1
DEIC
E 2
DRY
FAN
PIPE
1
PIPE
2
NONENONENONENONE
JP7 JP8 JP9
JP10 JP11 JP12 JP13
TEST
NONE
JP6
NONE 15K 15K 15K
JP18 JP19
LOUVOUT
FAN
CLUS
TER ER
R19 R21 R23
FAN2FAN1
HEAT COOL
MODE
R38
R38
ON
PWR
LESS
WIRE
AT
SWE-
KEEP
HOT
DEF.
SYMBOL
I
JP2 JP3 JP4 JP5JP1
IN
OUT
RY1
WPE1T250V
3A
1
N
BOARD
TERMINAL
1
N
PHASE
SINGLE
SUPPLY
POWER
TERMINAL
BOARD
A
BL
BK
BR
UNIT
OUTDOOR
TO
NONENONENONE
47
CT1
BL
BL
Page 7
2. PRINTED WIRING DIAGRAM
1 Indoor (AH-MP20)
7
Page 8
DH
CL
CAL
CM
CAH
CH
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 32
Preset 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 room
temperature is below 18 C, the preset temperature is set to 18 C,
and when the room temperature is over 32 C, the preset
temperature is set to 32 C.
Dry operation is divided into three zones (Cooling zone,
Dehumidifying zone and Circulating zone) by thermostat lines (D1 to
D3), and the compressor and the fan motor are controlled in each
zone 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
ttill
Circulating zone OFF "DL" or OFF
18 32
Preset tem
perature (C )
3. FAN SPEED
18 32
Preset tem
perature (C )
Compressor Fan speed
Fan speeds are given by the indoor fan motor, "DL"~"HH" which are
available in the following operation mode.
Fan
speed
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
—
840
980
1020
—
COOL
18 32
Preset tem
perature (C )
COOL HIGH — 1170
800
890
—
DRY
°°
°
°
°°
°
°
°
°
Page 9
Compressor
Valve Coil
Cooling ON OFF
9
5. TIMER
O
U
Circulating
OFF
4. TEST OUTPUTS IN EACH OPERATION MODE
If the "AUX" button on the unit is pressed for 5 seconds or more during
operation, cool test operation starts. The operation LED (red) flickers
during test run.
Mode
Outdoor
Fan Motor
Indoor
Fan Motor
OFF
O
ON
OFF
Cooling ON ON
OFF ON
L/UL
}
o
Dehumidiflying
ON ON UL/D
ON
OFF
5.1. ON/OFF Timer
Circulating
OFF OFF D/OFF OFF
When 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 cool
operation, operation starts before 0 to 30 minutes(depends on the room
temperature
) so that preset temperature is obtaind at set time.
POWER ON START
If the connecting wire "POWER ON" (JP99) is cut on the PWB
ass'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 one
hour. The one hour timer operation has priority over other time
operation, such as the TIMER ON and TIMER OFF. If the ONE-HOUR
TIMER button is pressed again during operation, the unit will operate
additionally for another one hour.
AUTOMATIC AIR CONDITIONING
When automatic air conditioning is selected, the operation mode and
preset temperature are set automatically according to the room
temperature on starting operation.
(Refer to Printed Wiring Board.)
AUTO RESTART 11.1.
When JP5 is ON
Power failuer occurs during operation, the unit will restart in the
same operation mode as before recovery.
11.2. When JP5 is OFF
25°C
24
°C > 26°C24°C
Room temperature
at o
peration start
Operation Mode Preset Temperature
Above 28
°C26°C
Auto restart function is not available.
AUTOMATIC FAN SPEED
When the automatic fan speed is selected in cool operation, the fan
speed is automatically changed by the thermostat lines C1 to C3 in
cool operation.
Below 24
°C DRY Room temperature at
operation start
When DRY mode is selected by the micro computer with AUTO
operation, the fan speed lamps on the indoor unit panel will indicate
identically with the fan speed symbols on the remote control dispaly, as
the FAN speed setting is changed accordingly. Despite,as the FAN
speed setting is changed accordingly. Despite, the actual fan speed will
not change, as it is determined autometically by the micro computer.
26
°C > 28°C COOL
Page 10
[2] TEST MODE
Keep 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 CLUSTER
Plasma cluster ion mode
SSR2 : ON
Relay (Cluster unit inside) : OFF
Minus ion mode
SSR2 : ON
Relay (Cluster unit inside) : ON
1) Cluster generator checking (STEP 1)
Time LED
ON OFF
(Yellow)
Judgement Normal Failure
(Generator OK) (Check circuit)
Page 11
[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.
Page 12
CHAPTER 4. TROUBLESHOOTING
12
Page 13
13
Page 14
Page 15
CHAPTER 5. REFRIGERANTION CYCLE AND PERFORMANCE CURVES
O.D I.D L
3.5 2.0 80
15
Capillary tube
[1] REFRIGERANT CYCLE
Page 16
1 – 14
16
[2] PERFORMANCE CURVES
Page 17
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.
Page 18
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
Page 19
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
Page 20
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
Page 21
3. The Drain pan and related.
1) Remove the screw fixing the Drain pan on both side.
2) Turn left the Drain hose.
21
Page 22
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
Page 23
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
Page 24
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
Page 25
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
Page 26
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
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