Sharp AY-A079E User manual

AY/AE-A079E
AY/AE-A099E
1
Page
SPECIFICATIONS ........................................................................................................................................... 2
EXTERNAL DIMENSIONS............................................................................................................................... 3
WIRING DIAGRAMS....................................................................................................................................... 4
ELECTRICAL PARTS ...................................................................................................................................... 5
MICROCOMPUTER CONTROL SYSTEM...................................................................................................... 8
FUNCTIONS ................................................................................................................................................... 9
TROUBLESHOOTING OF THE CONTROL CIRCUIT .................................................................................. 17
REFRIGERATION CYCLE........................................................................................................................... 21
PERFORMANCE CURVES .......................................................................................................................... 23
REFRIGERANT PIPE AINSTALLATION WORKS ......................................................................................... 24
DISASSEMBLING PROCEDURE ................................................................................................................. 25
REPLACEMENT PARTS LIST....................................................................................................................... 29
TABLE OF CONTENTS
SERVICE MANUAL
S2915AYA099E/
SHARP CORPORATION
SPLIT SYSTEM
ROOM AIR CONDITIONERS
INDOOR UNIT
AY-A079E
AY-A099E
AE-A079E
AE-A099E
Intheinterestsofuser-safety(Requiredbysafetyregulationsinsome
countries) thesetshouldberestoredto itsoriginalconditionandonly
parts identical to those specified should be used.
OUTDOOR UNIT
MODELS

AY/AE-A079E
AY/AE-A099E
2
SPECIFICATIONS
ITEMS INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT
AY-A079E AE-A079E AY-A099E AE-A099E
Cooling capacity kW 2.1 2.6
Heatpump kW 2.4 3.0
Heating capacity
Moisture removal Liters/h 0.9 1.2
Electrical data
Phase – Single
Rated frequency Hz 50
Rated voltage range V 198 to 264
Rated voltage V 220 - 240
Rated current Cool A 3.2 - 3.1 4.1 - 3.9
Heat A 2.9 - 2.8 4.0 - 3.9
Rated input Cool W 680 - 720 890 - 920
Heat W 630 - 670 880 - 920
Power factor Cool % 97 - 97 99 - 98
Heat % 99 - 99 99 - 98
Compressor Type Hermetically sealed rotary type
Model 2PS134D5AA01 RH174VHET
Oil charge 270cc (SUNISO 4GDID) 300cc (DIAMOND MS56)
Refrigerant system Evaporator Louver fin and Grooved tube type(7mm tube)
Condenser Corrugate Fin and Grooved tube type
Control Capillary tube
Refrigerant volume 690g 730g
De-lce system Micro computer controled reverse sysetm
Noise level High dB(A) 33 43 38 43
(at cooling) Med. dB(A) 29 – 31 –
Low dB(A) 26 – 27 –
Fan system
Drive Direct drive
Air flow quantity High m3/min. 5.8 20 7.1 20
(at cooling) Med. m3/min. 4.9 – 5.3 –
Low m3/min. 4.3 – 4.4 –
Fan Cross flow fan Propeller fan Cross flow fan Propeller fan
Connections
Refrigerant coupling Flare type
Refrigerant tube size Gas, Liquid 3/8", 1/4"
Refrigerant pipe sets No. AZ-24H5E; 5m(16.4ft), AZ-24H7E; 7m(23ft)
Drain piping mm(Inches) O.D ø 18(45/64)
Others
Safety device Compressor: Overload protector(MRA98589) Compressor: Overload protector(Internal)
Fan motors: Thermal fuse
Fuse, Micro computer control
Air filters Polypropylene net (Washable)
Net dimensions Width mm 790 720 790 720
Height mm 270 535 270 535
Depth mm 155 236 155 236
Net weight kg 7 27 7 31
Note: The condition of star (
) marked item are ‘IEC 378’.

AY/AE-A079E
AY/AE-A099E
3
270
790 155
Remote control
58 19.5
182
Length unit (mm)
EXTERNAL DIMENSIONS
Figure E-1. INDOOR UNIT for AY-A079E and AY-A099E
Figure E-2. OUTDOOR UNIT for AE-A079E and AE-E099E
430
720
775
143 55
245
535
278
236
228
20˚
58

AY/AE-A079E
AY/AE-A099E
4
WIRING DIAGRAMS
Figure W-1. Wiring Diagram for AY-A079E and AY-A099E
Figure W-2. Wiring Diagram for AE-A079E
THERMISTOR
(PIPE TEMP.)
THERMISTOR
(ROOM TEMP.)
LOUVER
MOTOR
1
2
3
4
5
6CN5
CN3
CN101
BCN1
CN2
BCN2
CN201
RECEIVER
& LED UNIT
SWITCH
UNIT
THERMAL FUSE
TRANSFORMER
CONTROL 
BOARD 
UNIT 2
WH WH
RE
RE
FAN MOTOR 
CAPACITOR
400V 1µF
FAN MOTOR
R.P.M
SIGNAL
BL
BL GR
RE
CN6
CN7
CN4 CN1
SSR
RY2
RY3
(B)
(A)
(F)
(E)
NR
VARISTOR
RY
CONTROL BOARD UNIT 1
OUT
C.T.
IN BK
OR
PU
BL
250V
FUSE 
T2.5A
INDOOR UNIT
TERMINAL 
BOARD 2 OUTDOOR UNIT
TERMINAL
BOARD
EVAPORATOR
THERMAL 
FUSE
TERMINAL
BOARD 1
POWER
SUPPLY
CORD
BR
BL
G(Y)
N
L
G(Y)
G(Y) G(Y)
N1
2
3
UNIT TO UNIT CORD
BL
BR
BL BK
BL
BR
GR
G(Y)
RE
WH
OR
PU
: BLACK
: BLUE
: BROWN
: GRAY
: GREEN–YELLOW
: RED
: WHITE
: ORANGE
: PURPLE
N
5
7
1
2
1
2
3
5 3 1
INDOOR UNIT
TERMINAL BOARD2
TERMINAL 
BORAD1
UNIT TOUNIT CORD
OUTDOOR UNIT
TERMINALBOARD
CONDENSER
THERMAL
FUSE
FAN
MOTOR VALVE COIL
FANMOTOR
CAPACITOR
400V1.5µF
COMPRESSOR
MOTOR
MOTORPROTECTOR
RUNNING
CAPACITOR
370V25µF
BK
BK
WH
RE
R
BL
RE
BL
BL
BK
BL RE
RE
G(Y)
G(Y)
C
S
I
2
3
N
I
2
3
N
N
L
BK
BL
G(Y)
RE
WH
:BLACK
:BLUE
:GREEN-YELLOW
:RED
:WHITE

AY/AE-A079E
AY/AE-A099E
5
ELECTRICAL PARTS
For Model AY-A079E and AE-A079E
DESCRIPTION MODEL REMARKS SITE
Compressor 2PS134D5AA01 220/240V, 50Hz, 650W AE
Indoor fan motor ML-A411 220/240V, 50Hz AY
Outdoor fan motor ML-A592 220/240V, 50Hz AE
Indoor fan motor capacitor – 400V, 1µF AY
Outdoor fan motor capacitor – 400V, 1.5µF AE
Running capacitor – 370V, 25µF AE
Transformer – Primary; AC 220V,50Hz AY
Secondary; AC16.1V, 50Hz
Fuse 250V, 2.5A AY
Reverse valve MMB-26A 240V AE
Reverse valve coil RSV-10 – AE
For Model AY-A099E and AE-A099E
DESCRIPTION MODEL REMARKS SITE
Compressor RH174VHET 220/240V, 50Hz, 800W AE
Indoor fan motor ML-A411 220/240V, 50Hz AY
Outdoor fan motor ML-A592 220/240V, 50Hz AE
Indoor fan motor capacitor – 400V, 1µF AY
Outdoor fan motor capacitor – 400V, 1.5µF AE
Running capacitor – 370V, 25µF AE
Transformer – Primary; AC 220V, 50Hz AY
Secondary; AC16.1V, 50Hz
Fuse – 250V, 2.5A AY
Reverse valve MMB-26A 240V AE
Reverse valve coil RSV-10 – AE
Figure W-3. Wiring Diagram for AE-A099E
INDOOR UNIT
TERMINAL BOARD2
TERMINAL 
BORAD1
UNIT TOUNIT CORD
OUTDOOR UNIT
TERMINALBOARD
CONDENSER
THERMAL
FUSE
FAN
MOTOR VALVE COIL
FANMOTOR
CAPACITOR
400V1.5µF
COMPRESSOR
MOTOR
MOTOR
PROTECTOR
RUNNING
CAPACITOR
370V25µF
BK
BK
WH
RE
R
BL
RE
BL
BL
BK
BL RE
RE
G(Y)
G(Y)
C
S
I
2
3
N
I
2
3
N
N
L
BK
BL
G(Y)
RE
WH
:BLACK
:BLUE
:GREEN-YELLOW
:RED
:WHITE

AY/AE-A079E
AY/AE-A099E
6
Figure L-1. Electronic Control Circuit Diagram for AY-A079E and AY-A099E
+
–
+
–
+
–
+
–
+
–
+
–
+
–
19
P41 18 P42 17 P43 16 P44 15 P45 14 P46 13
F12
RESET
33 P27 34 P26 35 P25 36 P24 37 P23 38 P22 39 P21 40 P20 41 K1 42 P17 43 P16 44 P15 45 P14 46 P13 47 P12 48 P11 49 P10 50 P07 51 P06
11
CK1
SM8313
IC1 10
CK2 9
AGND 8
P30 7 P31 6 P32 5 P33 4 P50 3 P51 2 P52 1 P53
32
TEST
52 P05
53 P04
54 P03
55 P02
56 P01
57 P00
58 GND
59 VDD
60 VR
61 P57
62 P56
63 P55
64 P54
31
30
OCS
IN
OCS OUT
29
P60 28
P61 27
P62
26
GND 25
P63 24
P64 23
P65 22
P66 21
KH 20
P40
IC3 IC2
IC5
RPM
4 3
3 2 1
3 2 1
4
1 5
1
1 2 3
5 4 3 2 1
1 2 3 4 5
1 2 3 4 5
7 6 1 8
7 6 1 8
55
1 2 3 4 5 6
L
N N
1
2
3
3 5
2
2 2
7
3
C6  100µ 10v
C5  0.1µ 50v
C4  47µ 25v
C3  0.22µ 50v
C16 0.1µ 50v C14 
0.01µ 16v
C14 1000P 50v
C15 0.1µ 50v
C19 0.01µ 50v
C21 1000P 50v
C7 0.1µ 50v
C23 1000P 50v
C17 1000P 50v
C13 1000P 50v
C8  10µ 10v
(C102) 0.1µ 25v
C101 33µ 10v
C11 10µ 16v
C10 10µ 16v
C22 1000P 50v
C2  2200µ 35v
C1  0.1µ 250vAC NR
R2  22k
R30  10k
R22  1k
R4  6.8k
R7  3.3k
R23 33k
R19 10k
R18 15kF
R17 15kF
R5  2.7k
R24  4.7k
R21 10k R20 10k
10k 10k 10k 10k
R31 R32 R33 R34 R35 R36 R37 R38 R39
22k(F) 22k(F) 22k(F) NONE 22k(F)
R25  1.2k
R29 330
R41 10k R40 10k
R28 680
R26 680
NC
NC
NC
NC
NC
NC
NC
R3  22k
R6  470  1/2w
RY1 RY3
RY2
D5
OUT
5V 12V
OUT 7812
D1 D3 D4
D2
C D
A B
13 11
SSR
S201D01
L
FUSE
CT
2.5A 250V
CNR3
C12 0.01µ250vAC
FAN MOTOR CAPACITOR
THERMAL PROTECTOR
A
IN OUT
RY1
E
RY2
CNR1 CNR2F
RY3
POWER SUPPLY
TERMINAL BOARD 3P GREEN/YELLOW
EARTH LINE NEUTRAL LINE COMPRESSOR VALVE COIL OUT DOOR UNIT
FAN MOTOR
BCN2 BCN1 CN2
CN2
Q3
3
12
CN1
12V
TR
12V
Q2
2
1
3
IC4
9
8
12V
BCN1
SSR
CN101
CN201 CN7
CN6
PHOTO DETECTOR UNIT
AUX.
(TEST RUN)
(YELLOW) LED102
(RED) LED101
2 3
BCN2
CN3
CN4
BCN1 BCN2
LOUVER MOTOR
FUNCTION 12H / 24H
IC1 PIN NO. 19
(P41)
SYMBOL JP10
AY-A079E X NONE
DEICE
BDEICE
A
15
(P45)
JP5
14
(P46)
JP4
SWEAT
ON/OFF
8
(P30)
JP6
D. FAN OFF
OFF/ON
17
(P43)
JP9
X NONE
OFF WIDEH
3/5min.
16
(P44)
JP7
X NONE X NONE X NONE
WIRELESS
CHANG/
NORMAL
5
(P33)
JP2
X NONE X NONE
NOTE :
1. : TEST POINT
5V
BCN2 BCN1
D9
5V
D8
5V
5V
5V
5V
5V 5V
5V
5V
5V
5V
12V
TEST
D7
R14 2k(F)
R13 10k(F)
R16 13.7k(F) C9
16V 220µ
C20 50V 1000P
TH1
ROOM TEMP.
15k(25˚C)
TH2
PIPE TEMP.
15k(25˚C)
BZ
5V
5V
10V
NC NC NC
NC NC
NC
1 2 3 4
8 7
IC6
6 5
JP14
DE. FAN B
12H/24H
SWEAT
PREHEAT
FAN L FAN M FAN H
MODEL B MODEL A
WIRELESS
RPM PLUSE
DEICE B DEICE A
D. FAN OFF
OFF WIDEH
DE. FAN A FREEZE B FREEZE A
POWER ON
JP13 JP12 JP11
JP9 JP7 JP5 JP4 Q1
OCS
8MHz
3
3
3
2
1
1
1
2
2
JP10
JP6 JP3 JP1 JP2
R10 R9 R8 R12 R11
JP8
CN5
IN IN
THERMAL FUSE
GND GND
2. Not specified is 1/5w
USE
RPM
PLUSE
1/3
7
(P31)
JP3
USE
PREHEAT
OFF/ON
6
(P32)
JP1
FAN L
4
(P50)
R10
140k(F)
FAN M
3
(P51)
R9
FAN H
2
(P52)
R8
22k(F)24.9k(F)
MODEL
B
1
(P53)
R12
133k(F)
MODEL
A
64
(P54)
R11
X NONE
DE. FAN
B
33
(P27)
JP14
X NONE
DE. FAN
A
34
(P26)
JP13
X NONE
FREEZE
B
35
(P25)
JP12
X NONE
FREEZE
A
36
(P24)
JP11
X NONE
POWER ON
ON/OFF
40
(P20)
JP8
USE
AY-A099E X NONE X NONE X NONE X NONEUSEUSEUSE USE 140k(F) 15k(F) 1.87k(F)15k(F) 107k(F) X NONE X NONE X NONE X NONE X NONEUSE
+
–
R15 2.7k(F)

AY/AE-A079E
AY/AE-A099E
7
Figure L-2. Printed Wiring Board
Thermistor
CN7
CN6
CN101
CN201
Indoor fan motor(R.P.M. Signal)
Indoor fan motor
Terminal board L
Terminal board " 1 "
Transformer BCN2 BCN1 TRANSFORMER
Louver motor
Fan motor capacitor
Fan motor capacitor
250V
2.5A
FUSE
INOUT
RY1
RY3
RY2
DPWBFA JBK0(P)
QPWBFB252JBE0(P)
R3
R26
R41
R40
C23 C13
R28
IC2 R29
JP46
D9
CN6
C22
C21
C20
R20
R15
R16
R21
R39
R25
OUT
IN
81
1
13
3
QPWBFB252JBE0(C)
DPWBFA JBK0(C)
R2
C2
D5
CNR3
C8
C7
C12 C4
C9
IC3
JP49
CT
JP 27
JP42
CN3 CN5
CN4
JP44
JP43
OSC
IC5
JP9
JP48
JP47
R11
R12
R8
R9
R35
C15
R10 C101
SW201
TEST
RUN AUX.
SW202
CN101
CN201
LED101 LED102
RECEIVER UNIT
QPWBFB124JBE0
QPWBFA652JBE0
OPERATION
(RED) TIMER
(YELLOW)
JP3
JP2
JP6
R36
R34
R32
R31
MODEL A
MODEL B
FAN H
FAN M
FAN L
WIRELESSL
D. FAN OFF
12H / 24H
OFF WIDEH
DEICE B
DEICE A
RPM PULSE
SWEAT
CN7
C5 C3
CN1
FAN LOUVER
IN
OUT
MOTOR RPM SIGNAL
THERMISTOR
MOTOR
GRAY
(B)
SSR
R6
D4
1
1
8
25 7
2
7
13
11
51 1
31
1
14
5
8
19
52 64
33
16 9
8
1
IC4
D2
D1 CN2
BCN1 (TRANSFORMER)
L
C1 NR
FAN MOTOR
CAPACITOR
(D)
CNR1
CNR2
VALVE
PURPLE
ORANGE
OUT DOOR
FAN MOTOR(F)
(E) 2
COIL
(C1)
(A1)
BLUE
(FAN MOTOR CAPACITOR)
D3
15
511
11
1
1
6
3
35
JP38
JP39
IC1
POWER ON
FREEZE A
FREEZE B
DE.FAN A
DE.FAN B
JP8
JP11
JP13
JP14
R7
R23
R24
JP50
JP33
JP4
JP5
JP7
R19
JP10
C19
C16
R4
Q3
Q2
R22
JP12
JP51
BCN2 JP35
JP41
JP40
R38
R37 R33
JP1
PREHEAT
JP34
C14
C18
JP37
JP36
IC6
C17
FPWBFA134JBK0
FPWBFA013JBK0
FSGY-A141JBK0
31
Q1
C6
C10
R30 R18
R17 C11
R5
20
11 3
5
R14
R13
D7 D8
GND 12V
GND
5V
12V
3
DIP DIP

AY/AE-A079E
AY/AE-A099E
8
Pin Terminal Input
No. Name Output Function
33 P27 IN MODEL 4
34 P26 IN MODEL 3
35 P25 IN MODEL 2
36 P24 IN MODEL 1
37 P23 IN SWITCH AUX.
38 P22 IN SWITCH TEST RUN
39 P21 IN –
40 P20 IN POWER ON
41 KI IN WIRELESS SIGNAL
42 P17 OUT LED OPERATION
43 P16 OUT LED TIMER
44 P15 OUT –
45 P14 OUT –
46 P13 OUT (VALVE COIL)
47 P12 OUT (OUT DOOR FAN)
48 P11 OUT RY1
49 P10 OUT SSR
50 P07 OUT LOUVER MOTOR
51 P06 OUT LOUVER MOTOR
52 P05 OUT LOUVER MOTOR
53 P04 OUT LOUVER MOTOR
54 P03 OUT –
55 P02 OUT –
56 P01 OUT –
57 P00 OUT –
58 GND IN 0V
59 VDD IN 5V
60 VR IN 5V
61 P57 IN (CURRENT LEVEL)
62 P56 IN TH1
63 P55 IN TH2
64 P54 IN MODEL A
Microcomputer (IC1)
The microcomputer is a CMOS, one chip, 8-bit microcomputer.
Microcomputer port allocation is as follows.
Pin Terminal Input
No. Name Output Function
1 P53 IN MODEL B
2 P52 IN FAN H
3 P51 IN FAN M
4 P50 IN FAN L
5 P33 IN WIRELESS
6 P32 IN PREHEAT
7 P31 IN PRM PLUSE
8 P30 IN SWEAT
9 AGND IN 0V
10 CK2 IN OSILLATION
11 CK1 IN OSILLATION
12 RESET IN RESET
13 F OUT BUZZER
14 R46 IN DEICE A
15 R45 IN DEICE B
16 R44 IN COMP. OFF WIDTH
17 R43 IN DEHUM. FAN OFF
18 R42 IN TEST 1
19 R41 IN –
20 R40 IN –
21 KH IN PRM SIGNAL
22 P66 IN –
23 P65 IN –
24 P64 IN –
25 P63 IN AC CLOCK
26 GND IN 0V
27 P62 IN –
28 P61 OUT EEPROM CLOCK
29 P60 IN EEPROM DATA
30 OSC IN –
31 OSC OUT –
32 TEST IN –

AY/AE-A079E
AY/AE-A099E
9
FUNCTIONS
1. Temperature control characteristic
1-1 COOL operation
In the “COOL” mode, the thermostat circuit is
controlled by four thermostat lines (C1 thru C4).
1-3 HEAT operation
In the “HEAT” mode, the thermostat circuit
is controlled by six thermostat lines (H01 thru
H4).
Figure Y-1
1-2 DRY operation
In the “DRY” mode, the thermostat circuit is
controlledbythreethermostatlines(D1thruD3).
Figure Y-3
2. Operation modes
2-1 COOL operation
Thecompressorturnsonoroff,atthethermostat
lines C3 and C4. The outdoor fan motor is also
controlled with the compressor.
Figure Y-4
Figure Y-2
Preset temperature (˚C)
H4
H3
H2
H1
H02
H01
17
19
21
22
24
26
31
33
35
36
38
40
18 32
Room temperature(˚C)
Room temperature
Preset temperature
Room 
temperature
transition
C3
C4
States 1 & 3 : Compressor ON
State 2 : Compressor OFF
1
2
3
18 32
C1
C2
C3
C4
17.5
18.5
19.5
20.5
31.5
32.5
33.5
34.5
Preset temperature (˚C)
Room temperature (˚C)
Room temperature(˚C)
Preset temperature (˚C)
18 32
D1
D2
D3
17.5
18.5
19.5
31.5
32.5
33.5

AY/AE-A079E
AY/AE-A099E
10
Figure Y-6
2-4 Fan only operation
The indoor fan motor always turns on.
3. Fan speed
Fan speeds are given by the indoor fan motor, "H",
“M”, “L”, “UL” and "D" which are available in the
following operation mode.
Table Y-2
FAN Switch HEAT COOL FAN ONLY
HIGH H M M
LOW M L L
SOFT L UL UL
2-3 Heat operation
Thecompressorturnsonoroff,atState 2 ,turns
on continuously at State 1 & 3 .
Figure Y-5
Table Y-1
Compressor Fan Speed
Cooling zone ON “UL”
Dehumidifying ON “D”
zone
Circulating OFF “D” or OFF
zone
2-2 DRY operation
On the switch on, the compressor always starts
to operate for 2 minutes with fan speed “D”
(slower than “UL”).
Themicrocomputerreadstheroom temperature
2 minutes after this first compressor operation.
This room temperature is set as the preset
temperature automatically.
The preset temperature ranges from 18˚C to
32˚C.Whentheroomtemperatureisbelow18˚C,
thepresettemperatureis set to 18˚C, andwhen
the room temperature is over 32˚C, the preset
temperature is set to 32˚C.
Dryoperationisdividedintothreezones(Cooling
zone,DehumidifyingzoneandCirculating zone)
by thermostat lines (D1 to D3), and the
compressor and the fan motor are controlled in
each zone as shown in Table Y-1.
Room temperature
Preset temperature
Room 
temperature
transition
D3
D2
D1
States 1 & 5 : Cooling zone
States 2 & 4 : Dehumidifying zone
States 3 : Circulating zone
3
4
5
1
2
Room temperature
Preset temperature
Room
temperature
transition
States 1 & 3 : Compressor ON
States 2 : Compressor OFF/(ON)
(Hot-keep function)
H1
H2
3
1
2

AY/AE-A079E
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11
Figure Y-9
Table Y-3
Figure Y-8
Figure Y-7
5. Preheat air flow
Thisfunctionis intendedtoprevent coldairfrom being
discharged when the heating operation starts or when
defrosting.
Whentheindoorpipetemperatureisbelow29˚Catthe
begining of the heat operation or after defrosting, the
indoor fan motor stays.
When the indoor pipe temperature gets higher than
29˚C, the fan motor is turned on at speed “UL” after
compensation of starting.
When the indoor pipe temperature exceeds 35˚C, the
specified fan speed is restored. When the indoor pipe
temperature falls below 30˚C, the fan speed shifts
down to “UL”. And, when the indoor pipe temperature
falls below 24˚C, the fan motor turns off. Then, over
29˚C , it turns on again at speed “UL”.
4. Hot-Keep
Thisfunctionautomaticallycontrolstheon-offoperation
of the indoor fan motor in accordance with the on-off
operation of the compressor during the heating
operation, thereby preventing the air conditioner from
delivering a cold air when the compressor is off.
When the room temperature exceeds the thermostat
line “H1”, the compressor is turned off, and the indoor
fan motor is turned off after rotating at “UL” for 30
seconds.
3 minutes after turning off the compressor, the
compressor is turned on for 3 minutes. (below
thermostat line H01). While over H01, the compressor
is off.
At 10 seconds after turning on the compressor, the
indoor fan motor is turned on.
Thenextcompressor OFF timeisfor3, 8 ormorethan
8minutesaccordingtotheroomtemperature(thetime
increases with a rise of room temperature) when 3
minutes elapse after turning on the compessor.
6. Overheating protection system
Whenoverloadingoccursduringtheheatingoperation,
thissystemcontrolstheoutdoorfanmotoraccordingto
theindoorpipetemperaturetopreventtheoverloading
ofthecompressorandrestraintheriseinhighpressure.
When the indoor pipe temperature exceeds U1˚C, the
outdoor fan motor is turned off, and when the indoor
pipe temperature falls U2˚C, the outdoor fan motor
turns on.
If 3 minutes elapse after turning off outdoor fan motor,
the outdoor fan motor is turned on, when the indoor
pipe falls U1˚C,
Compressor
ON
OFF
Indoor
fan motor 30sec.
time
UL
ON
OFF
3 min.
(Notes)
3 min.
10sec.
UL
30sec.
10sec.
Thermo off
3 or 8 or 15min.
(Notes)
Notes: Compressor is off when compressor OFF time is 15 minutes.
Pipe temperature(˚C)
24
29
30
35
OFF UL UL UL
OFFPreset
Fan speed
OFF OFF
ON
ON
U1
U2
U1
U2
Within 3 minutes Over 3 minutes
MODELS
AY-A099E
AY-A079E
M L UL
U1
U2
U1
U2
53˚C
Fan 
Speed
Line
49˚C
53˚C
49˚C
53˚C
49˚C
54˚C
50˚C
53˚C
49˚C
54˚C
50˚C

AY/AE-A079E
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12
7. Current control
This system, in order to prevent overcurrent during
heating operation, controls the outdoor fan motor and
changes the indoor fan motor speed by detecting total
current.
WhenthecurrentexceedsP2,theoutdoorfanmotoris
automatically turned off, and when the current falls
below P4, the outdoor fan motor is turned on.
WhenthecurrentexceedsP3andtheindoorfanspeed
shiftsdownbecauseofcoldair(5.Preheatairflow),the
changes in the indoor fan speed shifts up as follows,
from "off" to "UL", or from "UL" to "L". And when the
current falls bellow P5, the indoor fan speed shift up is
canceled.
Figure Y-10
8. Freeze preventive
When the indoor pipe temperature falls below -1˚C
duringcooloperationordryoperation,thecompressor
is turned off.
9. Defrost
The defrost timer (integrating the operation time of
compressor) counts time with microcomputer during
heat operation.
Frost of outdoor pipe is estimated by indoor pipe
temperature (TH2), room temperature (TH1), indoor
fan speed and operation state of compressor.
In the defrost operation, first the compressor is turned
off, the fan speed is set to “UL” and the outdoor fan
motor is turned off.
30 seconds later the indoor fan motor is turned off, 50
seconds later the reverse valve is turned off, and 60
seconds later the compressor is turned on.
In the end of defrosting, the compressor is turned off,
theoutdoorfanmotoristurnedon,50secondslaterthe
reverse valve is turned on, 60 seconds later the
compressor is turned on, starting heat operation.
Atthistime,theindoorfanmotoristurnedofforthefan
speed is set to “UL” if preheat air flow function is
effective.
Figure Y-11
Figure Y-12
10. Delayed operation of the reverse valve
Whentheheat operationisshut downorthe operating
modeisswitchedfromheattocoolordry,orviceversa,
the reverse valve is switched after 3 minutes.
11. Test run
If the “TEST RUN” button in the unit is pushed during
suspension of operation, cool test operation starts. At
this time, the fan speed is set to “AUTO”.
If this button is pushed during operation, the test
operation starts in current operation mode. The
operation LED (red) flickers during test run.
In cool and heat mode continuous compressor on
operationisperformed.In dry modetheoperationis in
dehumidifying zone. In fan only mode the indoor fan
motor runs continusly.
12. Timer
12-1 24-HOUR PROGRAMMABLE ON/OFF TIMER
ON-TIMERorOFF-TIMERcanbeindependently
programmed.Whentheunitoperatesduringone
houraftertheOFF-timeisset,thermostatsetting
is automatically shifted (+1˚C in cool operation
and dry operation, -3˚C in heat operation, 16˚C -
32˚C).
When the ON-timer is set in heat operation and
cool operation, operation starts before 0 to 30
minutes(depends on the room temperature) so
that preset temperature is obtaind at set time.
12-2 ONE-HOUR TIMER
When ONE-HOUR timer is set, the unit turns off
automaticallyafterone hour. Theonehour 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
duringoperation,theunitwilloperateadditionally
for another one hour.
Outdoor
Fan motor 
OFF
Indoor
Fan motor
Shift UP
Compressor
OFF
Time
Input current
Current transition
P1 5.3A 6.9A
P2 4.5A 6.1A
P3 4.0A 5.4A
P4 3.4A 4.6A
P5 2.6A 4.2A
AY-
A079E AY- A099E
Defrost start
Compressor
Reverse
Valve
Outdoor
Fan Motor
Indoor
Fan Motor
Preheat Air
Flow Control
30sec.
MAX. 9min.
50sec. 10sec.
60sec.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
50sec. 10sec.
UL
Switch ON
Heating Heating Heating
Min. 
40min. Max. 11min. Min.
30min. Max.
11min.
Defrost
Defrost

AY/AE-A079E
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13
13. 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.
Table Y-4
15. Outputs in each operation mode
Table Y-5
16. Power on start
Iftheconnectingwire"POWERON"(JP8)iscutonthe
PWB ass'y, when the power is supplied by turning on
a circuit breaker, the air conditioner automatically
starts of operation in "AUTO".
(Refer to Figure L-2. Printed Wiring Board.)
17. AUTO RESTART
Power failure occurs during operation, the unit will
retart in the same operation mode as before after
power recovery.
(Refer to Figure L-2. Printed Wiring Board.)
18.Test mode
18-1 TEST 1 (For control circuit operation checking)
Make terminals 1 and 2 of connector CN4 short-
circuited and supply the power.
Hereby the timer's period becomes shortened.
In this test mode, the control times are shortend
as follows.
The operation LED flicker's period not
in Test run shortened
The protector timer
The defrost timer
Other controls; 1/60 (ex.; 3 min. to 3 sec.)
18-2 TEST 2 (For output of each operation checking)
Keep pushing both the buttons, "AUX." and
"TEST RUN", and supply the power, the system
will go to the test 2 mode. In this mode, the
output of operation is switched by pushing the
"TEST RUN" button in the unit or the "OI" button
in the remote controller. Use the "AUX." button
to back to step 1.
Normal outputs are shown in Table Y-6 and Y-7.
14. Automatic fan speed
When the automatic fan speed is selected in cool or
heatoperation,thefanspeedisautomaticallychanged
bythethermostat linesC1toC3 incooloperation, and
H1 to H4 in heat operation.
a.COOL operation
Room temperature
at operation start Operation Mode Preset Temperature
Above 28˚C
Below 21˚C
26˚C
26˚C 28˚C
24˚C 26˚C
21˚C 24˚C
25˚C
24˚C
Room temperature 
at operation start
23˚C
COOL
DRY
HEAT
ON
OFF
ON
OFF
ON
ON
ON
OFF
OFF
ON ON OFF
OFF ON OFF
ON ON ON
OFF
ON/UL/OFF ON
ON UL/OFF ON
OFF OFF OFF
ON L/UL
UL/D
OFF D/OFF
OFF ON
OFF
OFF
OFF
OFF
Mode
Compressor Outdoor
Fan Motor
Cooling
Circulating
Normal
Preheat
Air Flow
Control
ON Defrost
FAN ONLY
Indoor
Fan Motor Valve Coil
C
O
O
L
H
E
A
T
D
R
Y
Cooling
Circulating
Dehumidiflying
Figure Y-13
b. HEAT operation
Figure Y-14
Room temperature
Preset temperature
Room
temperature
transition
C3
C2
C1
States 1 & 5 :"M"
States 2 & 4 : "L"
States 3 : "UL"
3
4
5
1
2
Room temperature
Preset temperature
Room
temperature
transition
States 1 & 7 : "H" 
States 2 & 6 : "M" 
States 3 & 5 : "L" 
States 4 : "L"/"UL"/OFF 
H1
H2
1
H4
H3
6
5
4
7
2
3

AY/AE-A079E
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14
19.Diagnosis procedure
When indoor fan motor is out of order or compressor lock occurs, the compressor, inddor fan motor, outdoor fan
motor, and louver are all stopped and the operation LED(red) turns on or off syncronously 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 syncrnoously with the timing of the timer LED by pushing continously for more than three seconds both
"TEST" button and "AUX." button.
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.
Indoor 
fan motor
Comp.-lock
Thermistor 
short state
Thermistor 
open state
Timer 
LED
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Operation 
LED
Operation 
LED
Operation 
LED
Operation 
LED
1sec. 1sec.
4sec.

AY/AE-A079E
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15
Table Y-6 [AY-A079E]
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Output for outdoor unit Lamps
RED YELLOW Indoor
Fan motor Louver
OFF
Compressor
Reverse Valve
Outdoor Fan Motor
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF OPEN
ON D OFFFlickering
OFF H OFF
ON ON L CLOSE
ON OFF D OFF
OFF UL OFF
OFF OFF H OFF
OFF OFF M OFF
OFF OFF L OFF
OFF ON OFF OFF
OFF OFF OFF OFF
ON OFF OFF OFF
OFF OFF OFF OFF
ON ON OFF OFF
ON ON OFF OFF
ON OFF OFF OFF
OFF OFF OFF OFF
OFF OFF OFF OFF
OFF OFF OFF OFF
ON OFF OFF OFF
OFF ON OFF OFF
ON ON OFF OFF
23 OFF OFF OFF OFF OFF
(Back to step 1)
ON
12
3
4
1
2
3
: 7˚C Room temp. 42˚C ON 
: 7˚C (Room temp.) or (Room temp.) 42˚C OFF
: –2˚C Pipe temp. 42˚C ON
: –2˚C (Pipe temp.) or (Pipe temp.) 42˚C OFF
: 0.1V (P57 input voltage) 0.45V ON
: 0.1V (P57 input voltage) or (P57 input voltage 0.45V) OFF
4 : When Power on start is effective, Timer LED(yellow) is ON.

AY/AE-A079E
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16
Table Y-7[AY-A099E]
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Output for outdoor unit Lamps
RED YELLOW Indoor
Fan motor Louver
OFF
Compressor
Reverse Valve
Outdoor Fan Motor
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF OPEN
ON D OFFFlickering
OFF H OFF
ON ON L CLOSE
ON OFF D OFF
OFF UL OFF
OFF OFF H OFF
OFF OFF M OFF
OFF OFF L OFF
OFF ON OFF OFF
OFF OFF OFF OFF
ON OFF OFF OFF
ON OFF OFF OFF
ON ON OFF OFF
ON OFF OFF OFF
ON OFF OFF OFF
OFF OFF OFF OFF
ON OFF OFF OFF
ON OFF OFF OFF
OFF ON OFF OFF
ON OFF OFF OFF
OFF ON OFF OFF
23 OFF OFF OFF OFF OFF
(Back to step 1)
ON
12
3
1
2
3
: 7˚C Room temp. 42˚C ON 
: 7˚C (Room temp.) or (Room temp.) 42˚C OFF
: –2˚C Pipe temp. 42˚C ON
: –2˚C (Pipe temp.) or (Pipe temp.) 42˚C OFF
: 0.1V (P57 input voltage) 0.45V ON
: 0.1V (P57 input voltage) or (P57 input voltage 0.45V) OFF
4 : When Power on start is effective, Timer LED(yellow) is ON.

AY/AE-A079E
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17
TROUBLESHOOTING GUIDE OF CONTROL CIRCUIT
measure the secondary voltage
of transformer.
YES
NO
YES
NO
The machine does not function
at all with remote controller and
switches on the indoor unit.
Using a tester, measure the 
voltage between terminal " 1 "
and " 2 " of connector CN2 on
PWB ass'y.
Is the measured value 
approx. 16.0 Vac ?
Replace the PWB with a new 
one. Is the 2.5A fuse down ?
Replace the fuse and varistor 
with new ones. Replace the ftransformer with
a new one.

AY/AE-A079E
AY/AE-A099E
18
YES
NO
NO
YES
The machine does not function
with remote controller
Push butt "OI" on on the wireless 
remote controller.
Is transmitting
indicator of the remote 
controller active ?
Is indicator lamp of
indoor unit proper ?
Replace the 
PWB with a 
new one.
Does beep sound
from the indoor unit ?
Does connector
CN101 & CN6 connect 
in place ?
Using a tester,
measure the voltage
between terminals
of resistor R15
on the PWB ass'y.
Push the button "OI".
Are batteries of the
wireless remote controller 
proper ?
Replace the batteries 
with new ones.
Replace the wireless
remote controller.
When the signal is
received, does the voltage
change ?
Replace the PWB with a new 
one.
PWB is normal.
Inspect the outdoor unit.
NO
YES
YES
NO
YES Replace the display unit 
with a new one.
Connect the 
connector 
properly.
NO
YES
NO

AY/AE-A079E
AY/AE-A099E
19
The room is not cooled at all
or not cooled.
The compressor does not operate.
Measure resistances of TH1 and TH2.
The control circuit is normal.
The compressor may be defective.
The running capacitor may be defective.
Refrigerant may be leaked.
The outdoor fan motor may be defective.
The outdoor fan motor capacitor may be defective.
Push the button "TEST RUN" on 
the indoor unit, and wait 3 minutes.
Is the voltage
between terminal "N" and
"1" of the terminal board the
power supply voltage ?
Are the resistances
conformed Fig. 1 ?
Replace the thermistor ass'y with a new one.
NO
YES
YES
NO
Replace the PWB ass'y with a new one.
0
20
40
60
80
100
120
140
160
180
K
0 10 20 30 40˚C-10
CHARACTERISTIC OF TH1 & TH2
Fig. 1
25˚C
15K
Using a tester, measure voltage at
the terminals on the terminal board.

AY/AE-A079E
AY/AE-A099E
20
The room is not heated at all or not heated.
The compressor does not operate.
The control circuit board is normal.
Refrigerant may be leaked.
The running capacitor may be defective.
The outdoor fan motor may be defective.
The outdoor fan motor capacitor may be defective.
The compressor may be defective.
The thermistor may be defective.



Is the voltage
between terminal "N" and
"1" of the terminal board the
power supply voltage ?
NO
Replace the PWB ass'y with a new one.
Push the button of "TEST RUN" on the 
indoor unit, and wait 3 minutes.
Using a tester, measure voltages at the 
terminals on the terminal board.
Select HEAT MODE with remote controller.
And then start operation.
Is the voltage
between terminal "N" and
"2" of the terminal board the
power supply voltage ?
Is the voltage
between terminal "N" and
"3" of the terminal board the
power supply voltage ?
YES
YES
YES
NO
NO
NO