Sharp AH-X127E User manual

AH-X127E
AU-X127E
AY-X127E
AE-X127E
1
SHARP CORPORATION
S4709AYX127E/
SPLITTYPE
ROOM AIR CONDITIONERS
Intheinterestsofuser-safety(Requiredbysafetyregulationsinsome
countries) thesetshouldberestoredtoitsoriginalconditionandonly
parts identical to those specified should be used.
SERVICE MANUAL
Page
SPECIFICATIONS ................................................................................................................................................. 2
EXTERNAL DIMENSIONS..................................................................................................................................... 4
WIRING DIAGRAMS............................................................................................................................................. 5
ELECTRICAL PARTS ............................................................................................................................................ 8
BLOCK DIAGRAM ..................................................................................................................................................9
MICROCOMPUTER CONTROL SYSTEM.......................................................................................................... 11
FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES ................................................................... 26
BREAKDOWN DIAGNOSIS PROCEDURE ........................................................................................................ 29
REFRIGERATION CYCLE................................................................................................................................. 31
PERFORMANCE CURVES ................................................................................................................................ 34
DISASSEMBLING PROCEDURE ....................................................................................................................... 35
OPTION ............................................................................................................................................................... 45
REPLACEMENT PARTS LIST............................................................................................................................. 47
TABLE OF CONTENTS
MODELS
INDOOR UNIT
AH-X127E
AY-X127E
AU-X127E
AE-X127E
OUTDOOR UNIT

AH-X127E
AU-X127E
AY-X127E
AE-X127E
2
SPECIFICATIONS
Models INDOOR UNIT OUTDOOR UNIT
AH-X127E AU-X127E
Cooling capacitor kW 3.5 (1.4 3.8)
Moisture removal Liters/h 1.3
Electrical data
Phase - Single
Rared frequency Hz 50
Rated voltage range V 198 to 264
Rated voltage V 220 - 240
Rated current A 7.9 - 7.5
Rated input W 1650
Power factor % 95 - 92
Compressor Type Hermetically sealed rotary type
Model KHV127FEM
Oil charge 270cc(SUNISO 4GSD)
Refrigerant Evaporator Grooved tube type
system Condenser Corrugate Fin and Grooved tube type
Control Capillary tube
Refrigerant volume 720g
Noise level High dB(A) 41 49
(at cooling) Med. dB(A) 37 -
Low dB(A) 33 -
Fan system
Drive Direct drive
Air flow High m3/min. 9.8 28.3
quantity Med. m3/min. 8.5 -
(at cooling) Low m3/min. 7.0 -
Fan Close flow fan Propeller fan
Connections
Refrigerant coupling Flare type
Refrigerant tube size Gas, Liquid 1/2", 1/4"
Refrigerant pipe sets No. AZ-24H5E; 5m (16.4 ft), AZ-24H7E; 7m (23ft)
Drain pipng mm (Inches) O.D ø 18 (45/64)
Others
Safety device Compressor: Thermal protector
Fan motors: Thermal fuse
Fuse, Micro computer control
Air filter Polypropylene net (Washable)
Net Width mm 790 (31-3/32) 728 (28-21/32)
dimensions Height mm 270 (10-5/8) 530 (20-7/8)
Depth mm 188 (7-13/32) 250 (9-27/32)
Net weight kg 8 33
Note: The condition of star(
) marked item are 'IEC 378'.

AH-X127E
AU-X127E
AY-X127E
AE-X127E
3
Models INDOOR UNIT OUTDOOR UNIT
AY-X127E AE-X127E
Cooling capacitor kW 3.5 (1.4 3.8)
Heatpump kW 4.5 (1.4 5.7)
Heating capacitor
Moisture removal Liters/h 1.3
Electrical data
Phase - Single
Rared frequency Hz 50
Rated voltage range V 198 to 264
Rated voltage V 220 - 240
Rated current Cool A 7.9 - 7.5
Heat A 7.9 - 7.5
Rated input Cool W 1650
Heat W 1650
Power factor Cool % 95 - 92
Heat % 95 - 92
Compressor Type Hermetically sealed rotary type
Model KHV127FEM
Oil charge 270cc(SUNISO 4GSD)
Refrigerant Evaporator Grooved tube type
system Condenser Corrugate Fin and Grooved tube type
Control Capillary tube
Refrigerant volume 790g
De-Ice system Micro computer controled reverse system
Noise level High dB(A) 41 49
(at cooling) Med. dB(A) 37 -
Low dB(A) 33 -
Fan system
Drive Direct drive
Air flow High m3/min. 9.8 28.3
quantity Med. m3/min. 8.5 -
(at cooling) Low m3/min. 7.0 -
Fan Close flow fan Propeller fan
Connections
Refrigerant coupling Flare type
Refrigerant tube size Gas, Liquid 1/2", 1/4"
Refrigerant pipe sets No. AZ-24H5E; 5m (16.4 ft), AZ-24H7E; 7m (23ft)
Drain pipng mm (Inches) O.D ø 18 (45/64)
Others
Safety device Compressor: Thermal protector
Fan motors: Thermal fuse
Fuse, Micro computer control
Air filter Polypropylene net (Washable)
Net Width mm 790 (31-3/32) 728 (28-21/32)
dimensions Height mm 270 (10-5/8) 530 (20-7/8)
Depth mm 188 (7-13/32) 250 (9-27/32)
Net weight kg 8 34
Note: The condition of star(
) marked item are 'IEC 378'.

AH-X127E
AU-X127E
AY-X127E
AE-X127E
4
EXTERNAL DIMENSIONS
Figure E-1. INDOOR UNIT
Figure E-2. OUTDOOR UNIT
790 188
270
800
58 18
19.5
182
Length unit (mm)
250
280
304
525
10.5
38
58
5
76.5
141.5
515
530
15
728
98 60
59.5
69.5
Length unit (mm)

AH-X127E
AU-X127E
AY-X127E
AE-X127E
5
WIRING DIAGRAMS
Figure W-1. Wiring Diagram for AH-X127E and AY-X127E
TERMINAL BOARD
GREEN-YELLOW
POWER SUPPLY
LOUVER MOTOR
ROOM TEMP THERMISTOR PIPE TEMP THERMISTOR FAN MOTOR
CAPACITOR 430V 1.5µF
RECEIVER BOARD UNIT DISPLAY BOARD UNIT
ORANGE
YELLOW
TH1 CN4
CN7 CN8
CN1 A CN2 BLUE
BLUE BLUE
FAN MOTOR
CN3 NR1
TH2 TH2-1
TH2-2
1 2
BLACK MA
C1
TR
5 3 1 RED
RED
C
S
R.P.M. SIGNAL
CONTROL BOARD UNIT
FUSE 250V 2.5A T
OutIn
SSR1
BROWN RY1
INDOOR UNIT
BLACK
TERMINAL BOARDTERMINAL BOARD OUTDOOR UNIT
FAN MOTOR
COMPRESSOR
UNIT TO UNIT CORD
CONTROL BOARD UNIT
1 1
2 2
N N
L
N
SERIAL SIGNAL CIRCUIT
LED INDICATION FOR SELF-DIAGNOSIS
Abnormal conditions
Short circuit of the outdoor thermistor Overheat of the compressor Abnormal AC current Compressor lock Open circuit of the outdoor thermistor DC overcurrent or over heat of the IPM AC overcurrent Open circuit of serial signal line Short circuit of serial signal line Abnormal fan motor of indoor unit
<Indication of the abnormal condition> LED yellow and LED red indicate automatically, if the set is in abnormal condition.
: LED no blink: LED blink
<LED yellow bliking> LED yellow blinks 5 times in 10 seconds.
Blink steps
<LED red blinking> Abnormal condition is indicated by the blink- ing pattern of LED red.

AH-X127E
AU-X127E
AY-X127E
AE-X127E
6
Figure W-2. Wiring Diagram for AU-X127E
1
N
N
L
2
1
N
2
1 3 5 4
3 2 1
INDOOR UNIT TERMINAL
BOARD OUTDOOR UNIT
TERMINAL BOARD
CONTROL  BOARD UNIT
TERMINAL BOARD
UNIT TO UNIT CORD
CAUTION
The voltage is high at C8,C9 (electronic capacitors) on outdoor unit. For mentenance dischage at C8,C9 to prevent electric shock. In case that WPE2 (protecter) has been fused, the voltage is kept high at C8,C9.
G(Y)
G(Y)
T1 WPE1 SA1 NR1
T4
T5
C3
C4
L3
C11
20A 250V
BR
BL T2
T11
T3
RE
CN3
AM
CRE
BK BL
CN8
FAN MOTOR CAPACITOR 2µF 430V
FAN MOTOR
CONTROL BOARD UNIT
BCN12 MRY1
GR
GR
BL
BL
T6
PTC1
CT1
C1
BK
REACTOR
L4
WPE3 3A 250V
NR2
RY1
CNR1 C24
C2
LED INDICATION OF SELF-DIAGNOSIS ON OUTDOOR UNIT
LED BLINKING
LED turns on Slow flashing (1 time for 2 seconds) Quick flashing (3 times for 2 seconds)
Example: NO.2 Compressor lock
on off 1.0sec 1.0sec 1.0sec0.6sec 0.6sec 0.6sec 1.0sec 1.0sec0.6sec 0.6sec 0.6sec0.6sec
NO.3 Overheat of the compressor
NO.
1 2 3 4
Normal Abnomal signal line Compressor lock  Overheat of the compressor DC overcurrent or overheat of the IPM
Short circuit of the thermistor Open circuit of the thermistor AC abnormal current AC overcurrent
LED indication pattern Mulfunction part or abnormal condition NO.
5 6 7 8
LED indication pattern Mulfunction part or abnormal condition
FAN MOTOR
BK BL BR GR
BLACK BLUE BROWN GRAY
: : : :
RE WH OR G(Y)
RED WHITE ORANGE
: : :
YE YELLOW
:
:GREEN-YELLOW
DIODE BRIDGE DIODE BRIDGE
DB1 DB2
OR
~~ ~~
REACTOR L2
50µF 200V
WH WH
1 4 RE YE
BL
RE C5
C10 GR
BK
C6
C8
BL BL
BL
150µF 400V 150µF 400V GRC9 BR
GR
YE
YE
C7
4700µF 63V T9 T7
WPE2 20A 250V
YE
YE
BL
BL
T10
T8
2000µF 400V 2000µF 400V
FC1
C29
POWER  TRANSISTOR MODULE (PM1)
U V W
BCN11
RE WH BK
COMPRESSORU(R)
V(S) W(C)
THERMISTOR COMPRESSOR TEMP.
THERMISTOR PIPE. TEMP.
TH1
TH2OR
WH
L1

AH-X127E
AU-X127E
AY-X127E
AE-X127E
7
Figure W-3. Wiring Diagram for AE-X127E
1
N
N
L
2
1
N
2
3 1 1 3 5
6 5 4 3 2 1
INDOOR UNIT TERMINAL
BOARD OUTDOOR UNIT
TERMINAL BOARD
CONTROL  BOARD UNIT
TERMINAL BOARD
UNIT TO UNIT CORD
CAUTION The voltage is high at C8,C9 (electronic capacitors) on outdoor unit.
For mentenance dischage at C8,C9 to prevent electric shock. In case that WPE2 (protecter) has been fused, the voltage is kept high at C8,C9.
G(Y)
G(Y)
T1 WPE1 SA1 NR1
T4
T5
C3
C4
L3
C11
20A 250V
BR
BL T2
T11
T3
RE
RY2
CNR2
CN4 CN3
4 WAY VALVE COIL FAN
MOTOR
AM
CRE
BK BL
CN8
FAN MOTOR CAPACITOR 2µF 430V
CONTROL BOARD UNIT
BCN12 MRY1
GR
GR
BL
BL
T6
PTC1
CT1
C1
BK
REACTOR
L4
WPE3 3A 250V
NR2
RY1
CNR1 C24
C2
LED INDICATION OF SELF-DIAGNOSIS ON OUTDOOR UNIT
LED BLINKING
LED turns on Slow flashing (1 time for 2 seconds) Quick flashing (3 times for 2 seconds)
Example: NO.2 Compressor lock
on off 1.0sec 1.0sec 1.0sec0.6sec 0.6sec 0.6sec 1.0sec 1.0sec0.6sec 0.6sec 0.6sec0.6sec
NO.3 Overheat of the compressor
NO.
1 2 3 4
Normal Abnomal signal line Compressor lock  Overheat of the compressor DC overcurrent or overheat of the IPM
Short circuit of the thermistor Open circuit of the thermistor AC abnormal current AC overcurrent
LED indication pattern Mulfunction part or abnormal condition NO.
5 6 7 8
LED indication pattern Mulfunction part or abnormal condition
FAN MOTOR
BK BL BR GR
BLACK BLUE BROWN GRAY
: : : :
RE WH OR G(Y)
RED WHITE ORANGE
: : :
YE GN YELLOW
GREEN
: :
:GREEN-YELLOW
DIODE BRIDGE DIODE BRIDGE
DB1 DB2
OR ~~ ~~
REACTOR L2
50µF 200V
WH WH
1 4 RE YE
BL
RE C5
C10 GR
BK
C6
C8
BL BL
BL
150µF 400V 150µF 400V GRC9 BR
GR
YE
YE
C7
4700µF 63V T9 T7
WPE2 20A 250V
YE
YE
BL
BL
T10
T8
2000µF 400V 2000µF 400V
FC1
C29
POWER  TRANSISTOR MODULE (PM1)
U V W
BCN11
RE WH BK
COMPRESSORU(R)
V(S) W(C)
THERMISTOR COMPRESSOR TEMP.
THERMISTOR AIR. TEMP. THERMISTOR PIPE. TEMP.
TH3
TH1
TH2
GN OR
WH
L1

AH-X127E
AU-X127E
AY-X127E
AE-X127E
8
ELECTRICAL PARTS
For Model AH-X127E and AU-X127E
DESCRIPTION MODEL REMARKS SITE
Indoor fan motor ML-A486 220 - 240V, 50Hz AH
Indoor fan motor capacitor – 430V, 1.5µF AH
Transformer – Primary; AC 230V, 50Hz AH
Secondary; AC14.6V, 50Hz
Fuse – 250V, 2.5A AH
Compressor KHV127FEM 3-PHASE Induction motor AU
Outdoor fan motor ML-A584 220 - 240V, 50Hz AU
Outdoor fan motor capacitor – 430V, 2.0µF AU
WPE1 – QFS-GA014JBE0(20A, 250V) AU
WPE2 – QFS-GA019JBE0(20A, 250V) AU
WPE3 – QFS-GA008JBE0(3A, 250V) AU
For Model AY-X127E and AE-X127E
DESCRIPTION MODEL REMARKS SITE
Indoor fan motor ML-A486 220 - 240V, 50Hz AY
Indoor fan motor capacitor – 430V, 1.5µF AY
Transformer – Primary; AC 230V, 50Hz AY
Secondary; AC14.6V, 50Hz
Fuse – 250V, 2.5A AY
Compressor KHV127FEM 3-PHASE Induction motor AE
Outdoor fan motor ML-A584 220 - 240V, 50Hz AE
Outdoor fan motor capacitor – 430V, 2.0µF AE
WPE1 – QFS-GA014JBE0(20A, 250V) AE
WPE2 – QFS-GA019JBE0(20A, 250V) AE
WPE3 – QFS-GA008JBE0(3A, 250V) AE

AH-X127E
AU-X127E
AY-X127E
AE-X127E
9
BLOCK DIAGRAMS
INDOOR UNIT for AH-X127E and AY-X127E
DC power supply circuit
Fan motor phase control circuit
Rotation pulse input circuit
AC clock circuit
Louver motor drive circuit
Remote controller signal
reception circuit
Buzzer drive circuit
CPU reset circuit
CPU oscillator circuit
Room temp. detect circuit
Heat exchanger pipe thermo circuit
Compensation circuit/
select circuit
Compensation circuit
Switchover circuit
Serial I/O circuit
Compressor relay drive circuit
LED drive circuit
Auto restart circuit 
Test run circuit
Power on circuit
Flow direction control
(louver motor)
Wireless remote control
operation
Audible operation confirmation
Room fan motor
Fan motor pulse detect
Room temp. thermistor
Heat exchanger pipe thermistor
Blower temperature,
fan speed, model select
Outdoor ratings
Wireless, preheat
Indoor/outdoor control signal I/O
Outdoor unit power supply
on/off control
LED display
Test run (forced operation)
Self diagnostics,
fault diagnosis
AC power
Unit-unit
wiring (AC
power and
serial
signals)
CPU
FUSE
Auxiliary mode Auxiliary mode button ON/OFF
2.5 A

AH-X127E
AU-X127E
AY-X127E
AE-X127E
10
OUTDOOR UNIT for AU-X127E and AE-X127E
CPU
Test mode circuit
LED drive circuit
Winter kit circuit (option)
Heat exchanger pipe 
thermo circuit
Compressor thermo circuit
CPU reset circuit
Serial I/O circuit
Power transistor module 
drive circuit
4-way valve relay drive
circuit
Outdoor fan relay drive
circuit
Power supply
circuit (built
into IPM)
CPU oscillator circuit
AC overcurrent detection
circuit
DC overcurrent detection
circuit
LED
Heat exchanger pipe
thermistor
Compressor thermistor
Current transformer
Outdoor temperature
thermo circuit Outdoor temperature thermistor
Compressor
Power 
transistor module
4-way valve (except for
the AU-X127E)
Outdoor fan
Smoothing
circuit Passive filter circuit
Filter
circuit Unit-unit
wiring (AC
power and
serial
signals)
20 A
protection
20 A protection
3 A
protection
Heat exchanger pipe
thermistor(option)
Outdoor temperature
thermistor(option)

AH-X127E
AU-X127E
AY-X127E
AE-X127E
11
MICROCOMPUTER CONTROL SYSTEM
Figure L-1. Electronic Control Circuit Diagram for AH-X127E
1 2 3 4 5
C101
C102 0.1µ25v
C80 25v 0.1µC8
16v 0.01µ
C10 25v0.1µ
C17 10v 100µ
NC
JP8
JP4 JP3 JP2
JP1
5v
5v SW1
5v
5v
5v
5v
5v
5v
5v
5v
5v
MODEL 8
MODEL 4 MODEL 3 MODEL 2 MODEL 1
RATING 1 RATING 2 CHAMB.T. FAN L FAN M FAN H
POWER ON
AUX.
(TEST RUN)
CN1 CN2
CN3CN301
CN201
CN101
RED
GRAY
GRAY GRAY GRAY
WHITE
11
1 1
33
3 3
2
CN8 CN701
CN7
1 2 3
22
2
JP 99
60 61
(RED)LED101
(YELLOW)LED102
+
–
R9 10k
R12 10k
R29 680
R31 R33 R46 R35 R37 R39
R30 R32 R45 R34 R36 R38
PHOTO DETECTOR UNIT
R10 680 R11 330
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
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
P41 P42 P43 P44 P45 P46 F RESET CK1 CK2 AGND P30 P31 P32 P33 P50 P51 P52 P53
19 18 17 16 15 14 13 12 11 10
9 8 7 6 5 4 3 2 1
TEST
OSC out
OSC in
P60
P61
P62
GND
P63
P64
P65
P66
KH
P40
32
31
30
29
28
27
26
25
24
23
22
21
20
NC NC NC NC
NC NC NC NC
NC
NC
NC
NC
NC
NC
8
IC2
12v
12v
12v
12v
12v
12v
12v
5 4 3 2 1
9
8
31
32
33
34
35
RED
ORANGE
YELLOW
PEACH
BLUE
LOUVER MOTOR
RY1
R16
1.8k
2
SSR1
30
+
–
39
40
17
8 7 6 5
1 2 3 4
C9
50v
1000P
R1 470 1/2W
IC80 R80
6.8k
R81 1k
R4 33k
R3 2W 270
R5 33k
3
BZ
C6
10v
100µZD1
ZD2
5C-1
C5 25v 47µ
+
–
+
–
+
–
C18
35v
100µ
+
–
41 43 OUT IN
7812
IC3
GND C4
25v 0.1µ
C2 AC 250v 0.1µ
C14 25v 0.1µ
C3 25v 1000µ
44
5v
5v
R7 20k
R6 3.3k
3
12
Q1
C7 50v 1000P
45
14 15
9
7
5
4
3
2
1
13 12 11
JP5 JP6 JP7 JP9
JP10
SIGNAL IN SIGNAL OUT
MODEL 5 MODEL 6 MODEL 7 WIRELESS PREHEAT
1 2
3
OSC
8MHz
6
5v
5v
1
2
3Q2
C16 16v 0.01µ
C15 16v 0.01µ
16 D5
R22 1.2k
R21 3.3k
R18 2.7k
R20 33k
R19 4.7k
IC1
TRANSFORMER
46
D1 D2 D3 D4
47
TR C21
250VAC 0.01µ
C1
430VAC
1.5µ
NR1
55
50
48
49
67 66 68
56 54
NF1
FU1
2.5A 250v T
CNR1
13 11
S201D01 SSR1
YELLOW
RED BLACK BLUE
BROWN GRAY
1
3
5
1
5
6
3 4 2
FAN MOTOR
57
51
38 37
10
D6
R26 2W 11k R23
100k R24
22k
R25 4.7k
R44 2W 680 X 5 R43 R42 R41 R40
R27 2W 11k C19
50v 0.047µ
C20
50v
0.01µ
24-2
C12
16v
10µ
+
–
R15 10.0kF
C11
16v
10µ
+
R14 10.0kF R13 10k TEST
36
62
63
CN4
2
1
5v TH2
TH1
PIPE TEMP. 15k (25°C) ROOM TEMP. 10k (25°C)
IN OUT
BROWN
BLUE
BLUE RED
BLACK
L N
POWER SUPPLY
TERMINAL BOARD 3P
1 N 2
OUTDOOR UNIT
TERMINAL BOARD 4P
GREEN / YELLOW
A S
52
D7
SERIAL SIGNAL
1 23
4
PC2
4 3
1 2PC1
5v
S M 8 3 1 3
FUNC-
TION
IC1 PIN
No. 16(P44) 17(P43) 36(P24) 35(P25) 34(P26) 33(P27) 20(P40) 19(P41) 18(P42) 29(P60) 8(P30) 7(P31) 5(P33) 4(P50) 3(P51) 2(P52)
JP10SYMBOL JP9 JP1 JP2 JP3 JP4 JP5 JP6 JP7 JP8 R30, R31 R32, R33 R45, R46 R34, R35 R36, R37 R38, R39
NONESET USE R30: 15K
R31: 13K R32: JP
R33:
NONE
R45: JP R46:
NONE
R34: JP R35:
NONE
R36: JP R37:
NONE
R38: JP R39:
NONE
PREHEAT
NONE/ON
WIRE-
LESS
NORMAL/
CHANGE
MODEL1
fmin UP
ON/
NORMAL
MODEL2
PANEL/
GRILL
MODEL3
AH/AY
MODEL4
HOT K.
NORMAL/
ON
MODEL5
RPM: 1/3
MODEL6
OUT T.
TH.
NONE/ON
MODEL7
ABILITY
1
MODEL8
ABILITY
2
RATED f
COOL RATED f
HEAT CHAMBER
TEMP.
CONTROL
FAN L
SPEED
1~5
FAN M
SPEED
6~10
FAN H
SPEED
11~12
USENONE NONE USE NONENONE USE NONE
NOTE: 1. : TEST POINT 2. Not specified R is 1/5W.
RPM
RY1
EVAPORATOR
10v 33µ
69
20
21
22
27
26
23 24

AH-X127E
AU-X127E
AY-X127E
AE-X127E
12
Figure L-2. Electronic Control Circuit Diagram for AU-X127E
+
1
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01
5
1N2
4 3 2 1
5 3 1
1
2
1
2
(Terminal Board)
TB
RE
BL
BR
G/Y
T2
T1 T4 CN3
T11
T3
RY1
CNR1
R15 R14 R13 R12
G/Y
(Control Box)
250v~
0.1µ
250v~
0.1µ
250v~
4700p
250v~
4700p
250v
0.1µ
3.3k
250v~
4700p 250v~
1µ
L3 CT1
L4
R1
3 4
3 4
1 2
1 2
C11
C2
C3
C4
SA1
NR1
C24
C12
NR2
430v 2.0µ
(Fan Motor 
Capactor)
510k
510k R2
C1
WH
WH
L1
20A 250v
FM
(Fan Motor)
3A 250v
WPE3
D1
2W 680
(Control Circuit Board Ass'y)
2W 680 2W
680 2W
680
R11
56k
JP16 R54.7k
R7
IC1 MB89855
(RH-IXA390JBE0)
C14
50v
1000p
C13
R4
2W
680
3
4
2
2
3
1
1
4
5v 5v
R16 10k R17 10k
TEST 2
TEST 1
D4
PC817X7
PC1
PC2
PC853H
LED1
R6
2.7k
C16
5v
5v
2.2k
R3
NC NC
NC
NC NC NC NC NC NC NC NC NC NC NC
NC
NC NC NC
0.1µ 25v
R38 (10k) 5v
5v
IC3
2
31PST993D
5v
OSC1
1µ
50v
C23
R10
6.49kF
C15
10v
220µ
5v
D3
D2 1.00kF
R9 +
JP1
1.80kF
R8
BL BL
BCN12
DTD113ZS
Q3 JP4
JP3
KRC106M Q1
Q2
RY2
D5
RY1
D6
13v
T5
T6
BK
DB1
OR
BCN13
BL PTC1 GR
GR
MRY1
BL
(PTC Thermistor)
(Reactor)
C10C6
RE
1
2 3
4
400v
150µ
400v
150µ
L2
(Reactor)
RE
RE
BK
C5 200v 50µF
WH
+
+
++
+
C8
CMP
YL
BL
DB2
GR
GR
BL BR
GR
WH
C7
YL
63v 4700µ
C9
GR
400v
2000µ
400v
2000µ
1/2W
270k
1/2W
270k R40
C29
0.33µ630v
R39
T9
T10
T8 WPE2
20A 250v
T7
FC1
YL BL
PM1 (IPM)
+
U RE
WH BK
V
W
(Compressor)
+
50v
1000p
+
TH2
(Thermistor for Condenser)
TH1
(Thermistor for Compressor)
OR WH
WH WH WH WH WH WH WH WH WH RE
5v BCN11
R33U 330 R32X 330 R31V 330 R30Y 330 R29W 330 R28Z 330
5v
5v
13v13v
ARM
CN8
JP2
R35
C18
1k
C21 C22
R20 R21
6.80kF 6.80kF
16v
10µ
16v
10µ
R37
R36 330k
(for WINTER-KIT)
CN10
R34
10k
5v
R27
R26
R25 R23
R24
20k
13k
R22
(for WINTER-KIT)
10 9 8 7 6 5 4 3 2 1 10 9 8 7 6 5 4 3 2 1
4 3 2
4 3 2 1
4 3 2 1 1 2 3 4
10
9 8 7 6 5
FREQ
NOTE: BK BL BR GN GR G/Y OR RE  WH  YL
(Black) (Blue) (Brown) (Green) (Gray) (Green/Yellow) (Orange) (Red) (White) (Yellow)

AH-X127E
AU-X127E
AY-X127E
AE-X127E
13
Figure L-3. Electronic Control Circuit Diagram for AY-X127E
1 2 3 4 5
C101
C102 0.1µ25v
C80 25v 0.1µC8
16v 0.01µ
C10 25v0.1µ
C17 10v 100µ
NC
JP8
JP4 JP3 JP2
JP1
5v
5v SW1
5v
5v
5v
5v
5v
5v
5v
5v
5v
MODEL 8
MODEL 4 MODEL 3 MODEL 2 MODEL 1
RATING 1 RATING 2 CHAMB.T. FAN L FAN M FAN H
POWER ON
AUX.
(TEST RUN)
CN1 CN2
CN3CN301
CN201
CN101
RED
GRAY
GRAY GRAY GRAY
WHITE
11
1 1
33
3 3
2
CN8 CN701
CN7
1 2 3
22
2
JP 99
60 61
(RED)LED101
(YELLOW)LED102
+
–R9
10k
R12 10k
R29 680
R31 R33 R46 R35 R37 R39
R30 R32 R45 R34 R36 R38
PHOTO DETECTOR UNIT
R10 680 R11 330
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
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
P41 P42 P43 P44 P45 P46 F RESET CK1 CK2 AGND P30 P31 P32 P33 P50 P51 P52 P53
19 18 17 16 15 14 13 12 11 10
9 8 7 6 5 4 3 2 1
TEST
OSCout
OSCin
P60
P61
P62
GND
P63
P64
P65
P66
KH
P40
32
31
30
29
28
27
26
25
24
23
22
21
20
NC NC NC NC
NC NC NC NC
NC
NC
NC
NC
NC
NC
8
IC2
12v
12v
12v
12v
12v
12v
12v
5 4 3 2 1
9
8
31
32
33
34
35
RED
ORANGE
YELLOW
PEACH
BLUE
LOUVER MOTOR
RY1
R16
1.8k
2
SSR1
30
+
–
39
40
17
8 7 6 5
1 2 3 4
C9
50v
1000P
R1 470 1/2W
IC80 R80
6.8k
R81 1k
R4 33k
R3 2W 270
R5 33k
3
BZ
C6
10v
100µZD1
ZD2
5C-1
C5 25v 47µ
+
–
+
–
+
–
C18
35v
100µ
+
–
41 43 OUT IN
7812
IC3
GND C4
25v 0.1µ
C2 AC 250v 0.1µ
C14 25v 0.1µ
C3 25v 1000µ
44
5v
5v
R7 20k
R6 3.3k
3
12
Q1
C7 50v 1000P
45
14 15
9
7
5
4
3
2
1
13 12 11
JP5 JP6 JP7 JP9
JP10
SIGNAL IN SIGNAL OUT
MODEL 5 MODEL 6 MODEL 7 WIRELESS PREHEAT
1 2
3
OSC
8MHz
6
5v
5v
1
2
3Q2
C16 16v 0.01µ
C15 16v 0.01µ
16 D5
R22 1.2k
R21 3.3k
R18 2.7k
R20 33k
R19 4.7k
IC1
TRANSFORMER
46
D1 D2 D3 D4
47
TR C21
250VAC 0.01µ
C1
430VAC
1.5µ
NR1
55
50
48
49
67 66 68
56 54
NF1
FU1
2.5A 250v T
CNR1
13 11
S201D01 SSR1
YELLOW
RED BLACK BLUE
BROWN GRAY
1
3
5
1
5
6
3 4 2
FAN MOTOR
57
51
38 37
10
D6
R26 2W 11k R23
100k R24
22k
R25 4.7k
R44 2W 680 X 5 R43 R42 R41 R40
R27 2W 11k C19
50v 0.047µ
C20
50v
0.01µ
24-2
C12
16v
10µ
+
–
R15 10.0kF
C11
16v
10µ
+
R14 10.0kF R13 10k TEST
36
62
63
CN4
2
1
5v TH2
TH1
PIPE TEMP. 15k (25°C) ROOM TEMP. 10k (25°C)
IN OUT
BROWN
BLUE
BLUE RED
BLACK
L N
POWER SUPPLY
TERMINAL BOARD 3P
1 N 2
OUTDOOR UNIT
TERMINAL BOARD 4P
GREEN / YELLOW
A S
52
D7
SERIAL SIGNAL
1 23
4
PC2
4 3
1 2PC1
5v
S M 8 3 1 3
FUNC-
TION
IC1 PIN
No. 16(P44) 17(P43) 36(P24) 35(P25) 34(P26) 33(P27) 20(P40) 19(P41) 18(P42) 29(P60) 8(P30) 7(P31) 5(P33) 4(P50) 3(P51) 2(P52)
JP10SYMBOL JP9 JP1 JP2 JP3 JP4 JP5 JP6 JP7 JP8 R30, R31 R32, R33 R45, R46 R34, R35 R36, R37 R38, R39
NONESET USE R30: 15K
R31: 13K R32: 15K
R33: 13K R45: JP
R46:
NONE
R34: JP R35:
NONE
R36: JP R37:
NONE
R38: JP R39:
NONE
PREHEAT
NONE/ON
WIRE-
LESS
NORMAL/
CHANGE
MODEL1
fmin UP
ON/
NORMAL
MODEL2
PANEL/
GRILL
MODEL3
AH/AY
MODEL4
HOT K.
NORMAL/
ON
MODEL5
RPM: 1/3
MODEL6
OUT T.
TH.
NONE/ON
MODEL7
ABILITY
1
MODEL8
ABILITY
2
RATED f
COOL RATED f
HEAT CHAMBER
TEMP.
CONTROL
FAN L
SPEED
1~5
FAN M
SPEED
6~10
FAN H
SPEED
11~12
USE USENONE NONE NONE NONE NONE NONE
NOTE: 1. : TEST POINT 2. Not specified R is 1/5W.
RPM
RY1
EVAPORATOR
10v 33µ
69
20
21
22
27
26
23 24

AH-X127E
AU-X127E
AY-X127E
AE-X127E
14
Figure L-3. Electronic Control Circuit Diagram for AE-X127E
+
1
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01
5
1N2
4 3 2 1
5 3 1
1 2 3
1 3
1
2
1
2
(Terminal Board)
TB
RE
BL
BR
G/Y
T2
T1 T4 CN3 CN4
T11
T3
RY1
CNR1
RY2
R15 R14 R13 R12
CNR2
G/Y
(Control Box)
250v~
0.1µ
250v~
0.1µ
250v~
4700p
250v~
4700p
250v
0.1µ
3.3k
250v~
4700p 250v~
1µ
L3 CT1
L4
R1
3 4
3 4
1 2
1 2
C11
C2
C3
C4
SA1
NR1
C24
C12
NR2
430v 2.0µ
(Fan Motor 
Capactor)
510k
510k R2
C1
WH
WH
L1
20A 250v
FM SV
(Fan Motor) (4 Way Valve)
3A 250v
WPE3
D1
2W 680
(Control Circuit Board Ass'y)
2W 680 2W
680 2W
680
R11
56k
JP16 R54.7k
R7
IC1 MB89855
(RH-IXA390JBE0)
C14
50v
1000p
C13
R4
2W
680
3
4
2
2
3
1
1
4
5v 5v
R16 10k R17 10k
D4
PC817X7
PC1
PC2
PC853H
LED1
R6
2.7k
C16
5v
5v
2.2k
R3
NC NC
NC
NC NC NC NC NC NC NC NC NC NC NC
NC
NC NC NC
0.1µ 25v
R38 (10k) 5v
5v
IC3
2
31PST993D
5v
OSC1
1µ
50v
C23
R10
6.49kF
C15
10v
220µ
5v
D3
D2 1.00kF
R9 +
JP1
1.80kF
R8
BL BL
BCN12
DTD113ZS
Q3 JP4
JP3
KRC106M Q1
Q2
RY2
D5
RY1
D6
13v
T5
T6
BK
DB1
OR
BCN13
BL PTC1 GR
GR
MRY1
BL
(PTC Thermistor)
(Reactor)
C10C6
RE
1
2 3
4
400v
150µ
400v
150µ
L2
(Reactor)
RE
RE
BK
C5 200v 50µF
WH
+
+
++
+
C8
CMP
YL
BL
DB2
GR
GR
BL BR
GR
WH
C7
YL
63v 4700µ
C9
GR
400v
2000µ
400v
2000µ
1/2W
270k
1/2W
270k R40
C29
0.33µ630v
R39
T9
T10
T8 WPE2
20A 250v
T7
FC1
YL BL
PM1 (IPM)
+
U RE
WH BK
V
W
(Compressor)
C26
+ +
50v
1000p
+
TH3 TH2
(Thermistor for Air) (Thermistor for Condenser)
TH1
(Thermistor for Compressor)
GN OR WH
WH WH WH WH WH WH WH WH WH RE
5v BCN11
R33U 330 R32X 330 R31V 330 R30Y 330 R29W 330 R28Z 330
5v
5v
13v13v
ARM
CN8
JP2
R35
C18
1k
C21 C22
R20 R21
6.80kF 6.80kF
6.80kF
16v
10µ
16v
10µ
16v
10µ
R37
R36 330k
(for WINTER-KIT)
CN10
R34
10k
5v
R27
R26
R25 R23
R24
R22
(for WINTER-KIT)
10 9 8 7 6 5 4 3 2 1 10 9 8 7 6 5 4 3 2 1
6 5 4 3 2
6 5 4 3 2 1
4 3 2 1 1 2 3 4
10
9 8 7 6 5
FREQ
NOTE: BK BL BR GN GR G/Y OR RE  WH  YL
(Black) (Blue) (Brown) (Green) (Gray) (Green/Yellow) (Orange) (Red) (White) (Yellow)
TEST 2
TEST 1

AH-X127E
AU-X127E
AY-X127E
AE-X127E
15
Figure L-4 Printed Wiring Board for AH-X127E
R80
R20
JP15
JP16
JP4
JP13
TH2-2
TH2-1
PC2 PC1
C7
C8
C3
C4 OUT
(BLACK)
ZD1 C5
OUT IN
IC3
D4
PRIMARY
FU1 250V 2.5A T
SECONDARY
TRANSFORMER
QPWBFB031JBE0
D3
D1
LED101LED
202
C102
PHOTO  DETECTOR  UNIT
CN201
CN101
C101
1 3
1 3
D2
C20
R26
ZD2
CN7 (FAN MOTOR)
NR1
C2
5
C21
CNR1
NF1
D6
152
1
2( 2 )
7
SSR1
R22
9
C18 C19
R23
C1
A
( N )
JP11
RY1
( L )
IN (BROWN)
FAN MOTOR CAPACITOR
JP12
R27R25
342 243
R6
R21
D7
R44
R24
R4 R5
CN4(TH1)
R43 R42
R41
R40
1
SW1
C9
R29
IC80
8
CN1
CN2
1
1
3
R1
CN3
(LOUVER M)
5
(JP1) (JP2) (JP3)
(JP7) (JP9) (JP10)
(JP8) C80
(JP4)
DSGY- A827 JBK0
3R9 R28
(JP99)
R12
3
CN8
R18
4
1 3Q1
R7
R19
C12
C6
R3
C11
R15
R14
C15
C16
R81 5
MEMORY
(JP5) (JP6)
D5
R11
32
33
20
POWER
ON
R10
IC2
8
C17
JP19
JP18
JP17
52
51
1
IC1
16
1
19
C10
(R31)64
(R39)
(R37)
(R35)
(R33)
(R38)
C14
(R36)
(R34)
(R30)
(R32)
(R45)
3
Q2
1
(R46)
OSC
9
R16 BZ
FB031
R13
DIP
DIP
GND
12V
5V VA
GND
-24V
HX12E
5V
FROM 
LOUVER
MOTOR
FROM 
FAN
MOTOR
TO
TERMINAL
BOARD 4P " 2 "
FROM 
FAN
MOTOR
TO
TERMINAL
BOARD 4P " N " FROM
TERMINAL
BOARD 3P " L "
FROM
TERMINAL
BOARD 4P " 1 "

AH-X127E
AU-X127E
AY-X127E
AE-X127E
16
Figure L-5 Printed Wiring Board for AU-X127E
QPWBFB034JBE0-A
L4
R2
R1
JP30
JP29
JP10
R39
T8
JP15
R5
R11
PC2 PC1
B17 JP24 JP23
C2
C11
CN10
D5
Q53
R12
R13
R14
R15
R6
T9
T7
CN3
5 1
CNR1
NR2
WPE2 20A 250V
JP33
BLUE
BLUE GRAY QPWBFB034JBE0-B
BROWN
YELLOW
YELLOW
T10
R10
C15
C17
C16
JP7
JP1
JP13
JP12
JP2
10
1
BCN11
JP6
JP5
JP16
C27
C18
R25
R38
R36
R26
R27
C23
R21
C21
R20
C22
C19
C20
JP28
JP27
T11 R8
R9
WPE3
CT1
D2
3A 250V
T5
C1
MRY1
BLACK
R3
R7
R17 R16
R24 R23 R22 R34
JP9 JP14
Q1
RY1
C24
R40
JP34
E C B
D3
D6
BCN12
Q3
E C B
LED1
JP8
JP4
C13
R4 D1
C12
NR1 T4
T3
SAI
20A 250V JP21 T1
WPE1
JP22
L3
C4
C3
T6
JP26
T2
JP25
C14
60 55 50 45 40 35 33
64
5 10
R29 R31 R33
OUT IN
R32
R18
C2
IC1
R30 R28
15 20 32
IC3
R37 R35
CN8
41
JP11
C28
OSC1
1
3 1
DSGY-A830JBK0
UX127E
BLUE
BROWN
G(Y)
RED
BLUE
F
DIP
MRY1
BCN13
FROM  EARTH  TERMINAL
FROM  TERMINAL BOARD " N "
FROM  TERMINAL BOARD " 2 "
FROM TERMINAL BOARD " 1 "
FROM  WINTER KIT (OPTION)
FROM  FAN MOTOR
C9 " - "
TO PM1 (IPM) FROM 
THERMISTOR
C7 " + "
PM1 (IPM) TO L1(REACTOR)
TO PTC THERMISTOR
FROM DB1 " ~ "
TO PWB " T6 "
TO PTC THERMISTOR

AH-X127E
AU-X127E
AY-X127E
AE-X127E
17
Figure L-6 Printed Wiring Board for AY-X127E
R80
R20
JP15
JP16
JP4
JP13
TH2-2
TH2-1
PC2 PC1
C7
C8
C3
C4 OUT
(BLACK)
ZD1 C5
OUT IN
IC3
D4
PRIMARY
FU1 250V 2.5A T
SECONDARY
TRANSFORMER
QPWBFB029JBE0
D3
D1
LED101LED
202
C102
PHOTO  DETECTOR  UNIT
CN201
CN101
C101
1 3
1 3
D2
C20
R26
ZD2
CN7 (FAN MOTOR)
NR1
C2
5
C21
CNR1
NF1
D6
152
1
2( 2 )
7
SSR1
R22
9
C18 C19
R23
C1
A
( N )
JP11
RY1
( L )
IN (BROWN)
FAN MOTOR CAPACITOR
JP12
R27R25
342 243
R6
R21
D7
R44
R24
R4 R5
CN4(TH1)
R43 R42
R41
R40
1
SW1
C9
R29
IC80
8
CN1
CN2
1
1
3
R1
CN3
(LOUVER M)
5
(JP1) (JP2) (JP3)
(JP7) (JP9) (JP10)
(JP8) C80
(JP4)
DSGY- A826 JBK0
3R9 R28
(JP99)
R12
3
CN8
R18
4
1 3Q1
R7
R19
C12
C6
R3
C11
R15
R14
C15
C16
R81 5
MEMORY
(JP5) (JP6)
D5
R11
32
33
20
POWER
ON
R10
IC2
8
C17
JP19
JP18
JP17
52
51
1
IC1
16
1
19
C10
(R31)64
(R39)
(R37)
(R35)
(R33)
(R38)
C14
(R36)
(R34)
(R30)
(R32)
(R45)
3
Q2
1
(R46)
OSC
9
R16 BZ
FB029
R13
DIP
DIP
GND
12V
5V VA
GND
-24V
YX12E
5V
FROM 
LOUVER
MOTOR
FROM 
FAN
MOTOR
TO
TERMINAL
BOARD 4P " 2 "
FROM 
FAN
MOTOR
TO
TERMINAL
BOARD 4P " N " FROM
TERMINAL
BOARD 3P " L "
FROM
TERMINAL
BOARD 4P " 1 "

AH-X127E
AU-X127E
AY-X127E
AE-X127E
18
Figure L-7 Printed Wiring Board for AE-X127E
QPWBFB033JBE0-A
L4
R2
R1
JP30
JP29
JP10
R39
T8
JP15
R5
R11
PC2 PC1
B17 JP24 JP23
C2
C11
CN10
D5
Q53
R12
R13
R14
R15
R6
D4
T9
T7
CN3
5 1
CNR1 CNR2
NR2
WPE2 20A 250V
JP33
BLUE
BLUE GRAY QPWBFB033JBE0-B
BROWN
YELLOW
YELLOW
T10
R10
C15
C17
C16
JP7
JP1
JP13
JP12
JP2
10
1
BCN11
JP6
JP5
JP16
C27
C18
R25
R38
R36
R26
R27
C26
C23
R21
C21
R20
C22
C19
C20
JP28
JP27
T11 R8
R9
WPE3
CT1
RY2
D2
3A 250V
T5
C1
MRY1
BLACK
R3
R7
R17 R16
R24 R23 R22 R34
JP9 JP14
Q1 Q2
RY1
C24
R40
JP34
E C B E C B
D3
D6
JP3
BCN12
Q3
E C B
LED1
JP8
JP4
C13
R4 D1
C12
NR1 T4
T3
SAI
20A 250V JP21 T1
WPE1
JP22
L3
C4
C3
T6
JP26
T2
JP25
C14
60 55 50 45 40 35 33
64
5 10
R29 R31 R33
OUT IN
R32
R18
C2
IC1
R30 R28
15 20 32
IC3
R37 R35
CN8
41
JP11
C28
OSC1
1
3 1
CN4
1
3
DSGY-A829JBK0
EX127E
BLUE
BROWN
G(Y)
RED
BLUE
F
DIP
MRY1
BCN13
FROM  EARTH  TERMINAL
FROM  TERMINAL BOARD " N "
FROM  TERMINAL BOARD " 2 "
FROM TERMINAL BOARD " 1 "
FROM  WINTER KIT (OPTION)
FROM  FAN MOTOR
FROM  4 WAY VALVE
C9 " - "
TO PM1 (IPM) FROM 
THERMISTOR
C7 " + "
PM1 (IPM) TO L1(REACTOR)
TO PTC THERMISTOR
FROM DB1 " ~ "
TO PWB " T6 "
TO PTC THERMISTOR

AH-X127E
AU-X127E
AY-X127E
AE-X127E
19
FUNCTIONS
k
j
i
h
g
f
e
d
c
b
a
z
+1.66
+1.00
+0.33
-0.33
-0.66
-1.00
-1.33
-1.66
-2.00
-2.33
Heating
SET VALUE
c
d
e
f
g
h
i
j
+1.33
+1.00
-0.33
-0.66
SET VALUE
+0.66
Cooling
+0.33
AH-X127E is not provided with the heating
function.
1. INDOOR UNIT
1-1 Temperature Adjustment
a. Normal control
Proportional control (P control)
When the temperature zone changes, this control
changes the frequency by one rank to move closer
to the set value.
Integral control (I control)
When the temperature zone has set time in the
same zone, this control changes the frequency by
one rank to move closer to the set value. (Excluding
the h zone.)
b. Initial control
The initial frequency is determined as shown in the
tables below based on the difference between the
temperature adjustment setting at the beginning of
operation and the room temperature.
After operation begins, normal control is performed
and therefore the correspondences in the tables
below will not hold.
c. Temperature adjustment
The temperature adjustment range is changed by
changing the operating mode with the operation
switch.
(1) Heating
If the room temperature is in the z zone when
operation begins, proportional/integral control is not
performed, and the machine runs at frequency code
c full power until the h zone is reached. When the h
zone is reached, the frequency changes to the
frequency code determined by fuzzy calculation,
and after that proportional/integral control is
performed.
(2) Cooling
If the room temperature is in the c zone when
operation begins,proportional/integral control is not
performed, and the machine runs at frequency
code 9 power until the h zone is reached. When the
h zone is reached, the frequency changes to the
frequency code determined by fuzzy calculation,
and after thatproportional/integral control is
performed.
(3) Dry
After operation begins, 2 minutes (running at the h
zone) of the room temperature is stored in memory,
and that becomes the set value.
(4) Circulation
The frequency code 0 is sent to the outdoor
machine, and only the fan of the indoor machine
runs, the compressor does not run.
e f
f
h
i
+1.33
+1.00
-1.00
+0.33
Dry
MEMORY SET VALUE
Cooling
Room 
temp. 
zone
Frequency 
Code
c 9
d 8
e 7
f 5
g 3
h 2
i 1
j OFF
Heating
Room 
temp. 
zone
Frequency 
Code
k OFF
(Hot keep fan)
j 1
i 1
h 2
g 3
f 4
e 5
d 6
e 7
f 5
g 3
h 2
i 1
Dry
Room 
temp. 
zone
Frequency 
Code
e 4
f 3
g 2
h 1
i OFF
c
b
a
z
8
A
B
C

AH-X127E
AU-X127E
AY-X127E
AE-X127E
20
1-2 Indoor fan control
This control uses the thermistor for the indoor heat
exchanger to control cold air blowing prevention, the
indoor fan, and overheating prevention.
(1) Control for indoor overheating prevention
If the temperature of the indoor heat exchanger
exceeds the overheating prevention line during
heating due to the operating frequency or the nature
of the operation, this control lowers the frequency
by 4 to 15 Hz. When the temperature goes below
the overheating prevention line sixty seconds later,
normal operation is restored.
(2) Control for indoor freezing prevention
If the temperature of the indoor heat exchanger
stays below approximately 0°C for four minutes
during cooling or dry, this control stops the
compressor. Over 2˚C the compressor will run
again.
(3) Control for cold air blowing prevention
When heating begins, this control stops the indoor
fan until the temperature of the indoor heat
exchanger reaches 26°C. It also stops the fan if the
temperature goes below 23°C during operation.
(4) Indoor fan and operating frequency
The indoor fan has 12 speeds, and changing is
done in four stages, "Auto", "High", "Med", and
"Low". The relations between the indoor fan speed,
air quantity setting, operating frequency, and indoor
heat exchanger are shown in the following charts.
Operating
frequency
Over 50 Hz
Overheating prevention line (°C)
50 to 43 Hz 43 to 37 Hz Below 37 Hz
54
57
53
56
52
55
51
54
During normal
operation
During full
power operation
OFF
1
2
3
4
5
6
7
8
9
10
11
123456789OFF
Fan speed
Frequency cord
Fan speed : High / Med / Low
High
Med
Low
OFF
1
2
3
4
5
6
7
8
9
10
11
123456789OFF
Fan speed
Frequency cord
Fan speed : Automatic
COOLING
OFF
1
2
3
4
5
6
7
8
9
10
11
123456789OFF
Fan speed
Frequency cord
Fan speed : High / Med / Low
12
A B C A
B
C
Low
D - H
Med
D - H
High
D - H
OFF
1
2
3
4
5
6
7
8
9
10
11
123456789OFF
Fan speed
Frequency cord
Fan speed : Automatic
12
A B C A
B
C
G, H
D
E
F
HEATING
53
50
47
44
38
32
26
H
G
F
E
D
C
B
A
(˚C)
Cold air blowing
prevention line
Temperature of indoor heat exchanger
Differential
3˚C