aircon ACZEM4C4R18 User manual

GREE ELECTRIC APPLIANCES,INC.OF ZHUHAI
Service Manual
Model: ACZEM4C4R18/ACZCI4C4R18
ACZEM4H4R18/ACZCI4H4R18
ACZEM4C4R24/ACZCI4C4R24
ACZEM4H4R24/ACZCI4H4R24
(Refrigerant:R410A)

Service Manual
Table of Contents
Table of Contents
Table of Contents
Part Ⅰ: Technical Information......................................................................... 1
1. Summary........................................................................................................................ 1
2. Specications............................................................................................................ 2
2.1 Specication Sheet............................................................................................................. 2
2.2 Operation Characteristic Curve .......................................................................................... 6
2.3 Capacity Variation Ratio According to Temperature ........................................................... 6
2.4 Cooling and Heating Data Sheet in Rated Frequency ....................................................... 7
2.5 Noise Curve........................................................................................................................ 7
3. Outline Dimension Diagram.......................................................................... 8
3.1 Indoor Unit.......................................................................................................................... 8
3.2 Outdoor Unit ....................................................................................................................... 9
4. Refrigerant System Diagram...................................................................... 10
5. Electrical Part............................................................................................................11
5.1 Wiring Diagram..................................................................................................................11
5.2 PCB Printed Diagram....................................................................................................... 14
6. Function and Control........................................................................................ 17
6.1 Remote Controller Introduction ........................................................................................ 17
6.2 Brief Description of Modes and Functions........................................................................ 20
Part Ⅱ: Installation and Maintenance ................................................... 27
7. Notes for Installation and Maintenance............................................ 27
8. Installation.................................................................................................................. 29
8.1 Installation Dimension Diagram........................................................................................ 29
8.2 Installation Parts-checking .............................................................................................. 31
8.3 Selection of Installation Location...................................................................................... 31
8.4 Electric Connection Requirement .................................................................................... 31
8.5 Installation of Indoor Unit.................................................................................................. 31
8.6 Installation of Outdoor Unit............................................................................................... 34
8.7 Vacuum Pumping and Leak Detection ............................................................................. 35
8.8 Check after Installation and Test Operation ..................................................................... 35

Table of Contents
Service Manual
Table of Contents Table of Contents
9. Maintenance.................................................................................................................36
9.1 Malfunction Analysis............................................................................................................36
9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement ...........................................40
9.3 How to Check Simply the Main Part....................................................................................45
10. Exploded Views and Parts List................................................................61
10.1 Indoor Unit.........................................................................................................................61
10.2 Outdoor Unit ......................................................................................................................65
11. Removal Procedure............................................................................................73
11.1 Removal Procedure of Indoor Unit ....................................................................................73
11.2 Removal Procedure of Outdoor Unit .................................................................................83
Appendix:.............................................................................................................................95
Appendix 1: Reference Sheet of Celsius and Fahrenheit .........................................................95
Appendix 2: Conguration of Connection Pipe..........................................................................95
Appendix 3: Pipe Expanding Method ........................................................................................96
Appendix 4: List of Resistance for Temperature Sensor ...........................................................97

1
Technical Information
Service Manual
1. Summary
Part Ⅰ: Technical Information
Indoor Unit:
Outdoor Unit:
Remote Controller:
YX1FF
ON/OFF MODE
FAN SWING
SLEEP TIMER
+
-
AUTO
COOL
DRY
FAN
HEAT
T-ON T-OFF SWING
SLEEP
LOCK
SPEED
ACZEM4C4R18
ACZEM4H4R18
ACZEM4C4R24
ACZEM4H4R24
ACZCI4C4R18
ACZCI4H4R18
ACZCI4C4R24
ACZCI4H4R24

2Technical Information
Service Manual
2. Specications
2.1 Specication Sheet
Model ACZEM4C4R18/ACZCI4C4R18 ACZEM4H4R18/ACZCI4H4R18
Product Code CB162008600_L17107 CB162008000_L14385
Power
Supply
Rated Voltage V ～208/230 208/230
Rated Frequency Hz 60 60
Phases 1 1
Power Supply Mode Outdoor Outdoor
Cooling Capacity(Min ～Max) Btu/h 18000(2201~20001) 18000(2201~20001)
Heating Capacity(Min ～Max) Btu/h / 19000(3050~23500)
Cooling Power Input(Min ～Max) W 1800(350~2500) 1950(350~2560)
Heating Power Input(Min ～Max) W / 1730(310~2600)
Cooling Current Input A 7.98 8.65
Heating Current Input A / 7.52
Rated Input W 2500 2600
Rated Current A 11.09 11.54
Air Flow Volume (S/H/M/L) CFM 860/780/650/550 860/780/650/550
Dehumidifying Volume Pint/h 3.80 3.80
EER (Btu/h)/W 10 8.5
COP (Btu/h)/W / 10.23
SEER 15 15
SCOP / 9
Application Area yd227 1/2-40 2/3 27 1/2-40 2/3
Indoor Unit
Indoor Unit Model ACZEM4C4R18 ACZEM4H4R18
Indoor Unit Product Code CB162N08600_L17107 CB162N08000_L14385
Fan Type Cross-ow Cross-ow
Fan Diameter Length(DXL) inch Ф3 6/7X28 Ф3 6/7X28
Cooling Speed(S/H/M/L) r/min 1500/1200/1050/900 1500/1200/1050/900
Heating Speed(S/H/M/L) r/min / 1500/1250/1150/1050
Fan Motor Power Output W 20 20
Fan Motor RLA A 0.32 0.32
Fan Motor Capacitor μF 1.5 1.5
Evaporator Form WAluminum Fin-copper Tube Aluminum Fin-copper Tube
Evaporator Pipe Diameter inch Ф2/7 Ф2/7
Evaporator Row-n Gap inch 2-3/50 2-3/50
Evaporator Coil Length (LXDXW) inch 28 1/7X1X12 28 1/7X1X12
Swing Motor Model MP28VB MP28VB
Swing Motor Power Output W 2 2
Fuse Current A 3.15 3.15
Sound Pressure Level (S/H/M/L) dB (A) 48/42/39/36 48/42/39/36
Sound Power Level (S/H/M/L) dB (A) 58/52/49/46 58/52/49/46
Dimension (WXHXD) inch 37X11 2/3X8 37X11 2/3X8
Dimension of Carton Box (LXWXH) inch 39 4/5X15X11 1/5 39 4/5X15X11 1/5
Dimension of Package (LXWXH) inch 39 8/9X15X11 4/5 39 8/9X15X11 4/5
Net Weight lb 26.46 26.46
Gross Weight lb 33.07 33.07

3
Technical Information
Service Manual
Outdoor
Unit
Outdoor Unit Model ACZCI4C4R18 ACZCI4H4R18
Outdoor Unit Product Code CB145W04100_L17107 CB145W04200_L14385
Compressor Manufacturer ZHUHAI LANDA COMPRESSOR
CO.,LTD ZHUHAI LANDA COMPRESSOR CO.,LTD
Compressor Model QXA-B141zF030A QXA-B141zF030A
Compressor Oil 68EP 68EP
Compressor Type Rotary Rotary
Compressor LRA. A 25 25
Compressor RLA A 7.2 9.7
Compressor Power Input W 1440 1440
Compressor Overload Protector 1NT11L-6233 1NT11L-6233
Throttling Method Capillary Capillary
Set Temperature Range °F 60.8 ～86.0 60.8 ～86.0
Cooling Operation Ambient
Temperature Range °F 64.4 ～109.4 64.4 ～109.4
Heating Operation Ambient
Temperature Range °F / 19.4 ～75.2
Condenser Form Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Condenser Pipe Diameter inch Ф3/8 Ф3/8
Condenser Rows-n Gap inch 1-3/50 1-3/50
Condenser Coil Length (LXDXW) inch 33 3/5X8/9X26 33 3/5X8/9X26
Fan Motor Speed rpm 450/800 450/800
Fan Motor Power Output W 60 60
Fan Motor RLA A 0.37 0.37
Fan Motor Capacitor μF / /
Outdoor Unit Air Flow Volume CFM 1883 1883
Fan Type Axial-ow Axial-ow
Fan Diameter inch Φ20 1/2 Φ20 1/2
Defrosting Method /Automatic Defrosting
Climate Type T1 T1
Isolation I I
Moisture Protection IP24 IP24
Permissible Excessive Operating
Pressure for the Discharge Side PSIG 550 550
Permissible Excessive Operating
Pressure for the Suction Side PSIG 240 240
Sound Pressure Level (H/M/L) dB (A) 56/-/- 56/-/-
Sound Power Level (H/M/L) dB (A) 66/-/- 66/-/-
Dimension (WXHXD) inch 37 3/5X27 3/5X15 3/5 37 3/5X27 3/5X15 3/5
Dimension of Carton Box (LXWXH) inch 40 2/5X17 8/9X28 8/9 40 2/5X17 8/9X28 8/9
Dimension of Package (LXWXH) inch 40 1/2X18X29 1/2 40 1/2X18X29 1/2
Net Weight lb 97.0 101.4
Gross Weight lb 105.8 111.3
Refrigerant R410A R410A
Refrigerant Charge oz 42.3 63.5
Connection
Pipe
Connection Pipe Length ft 24.6 24.6
Connection Pipe Gas Additional
Charge oz/ft. 0.2 0.3
Outer Diameter Liquid Pipe inch 1/4 1/4
Outer Diameter Gas Pipe inch 1/2 1/2
Max Distance Height ft 32 4/5 32 4/5
Max Distance Length ft 82 82
Note: The connection pipe applies metric diameter.
The above data is subject to change without notice. Please refer to the nameplate of the unit.

4Technical Information
Service Manual
Model ACZEM4C4R24/ACZCI4C4R24 ACZEM4H4R24/ACZCI4H4R24
Product Code CB162008500_L17107 CB162007900_L14385
Power
Supply
Rated Voltage V ～208/230 208/230
Rated Frequency Hz 60 60
Phases 1 1
Power Supply Mode Outdoor Outdoor
Cooling Capacity(Min ～Max) Btu/h 22000(8630~23200) 22000(8630-23200)
Heating Capacity(Min ～Max) Btu/h / 23000(8650~26000)
Cooling Power Input(Min ～Max) W 2310(600~2700) 2310(600~2700)
Heating Power Input(Min ～Max) W / 2300(610~2750)
Cooling Current Input A 10.25 10.25
Heating Current Input A / 10.20
Rated Input W 2700 2750
Rated Current A 11.98 12.20
Air Flow Volume (S/H/M/L) CFM 1000/800/700/600 1000/800/700/600
Dehumidifying Volume Pint/h 5.28 5.28
EER (Btu/h)/W 9.52 9.52
COP (Btu/h)/W / 10
SEER 15 15
SCOP / 8.5
Application Area yd232 2/7-50 1/4 32 2/7-50 1/4
Indoor Unit
Indoor Unit Model ACZEM4C4R24 ACZEM4H4R24
Indoor Unit Product Code CB162N08500_L17107 CB162N07900_L14385
Fan Type Cross-ow Cross-ow
Fan Diameter Length(DXL) inch Ф3 6/7X30 1/8 Ф3 6/7X30 1/8
Cooling Speed(S/H/M/L) r/min 1500/1200/1050/900 1500/1200/1050/900
Heating Speed(S/H/M/L) r/min / 1450/1150/1020/950
Fan Motor Power Output W 60 60
Fan Motor RLA A 0.24 0.24
Fan Motor Capacitor μF AS/ /
Evaporator Form WAluminum Fin-copper Tube Aluminum Fin-copper Tube
Evaporator Pipe Diameter inch Ф2/7 Ф2/7
Evaporator Row-n Gap inch 2-3/50 2-3/50
Evaporator Coil Length (LXDXW) inch 28 1/7X1X12 28 1/7X1X12
Swing Motor Model MP35XX MP35XX
Swing Motor Power Output W 3 3
Fuse Current A 3.15 3.15
Sound Pressure Level (S/H/M/L) dB (A) 52/46/42/36 52/46/42/36
Sound Power Level (S/H/M/L) dB (A) 62/56/52/46 62/56/52/46
Dimension (WXHXD) inch 39 5/7X12 2/5X8 3/5 39 5/7X12 2/5X8 3/5
Dimension of Carton Box (LXWXH) inch 42 1/5X15 3/5X12 1/3 42 1/5X15 3/5X12 1/3
Dimension of Package (LXWXH) inch 42 2/5X15 3/5X13 42 2/5X15 3/5X13
Net Weight lb 28.66 33.1
Gross Weight lb 36.38 40.79

5
Technical Information
Service Manual
Outdoor
Unit
Outdoor Unit Model ACZCI4C4R24 ACZCI4H4R24
Outdoor Unit Product Code CB145W03900_L17107 CB145W04000_L14385
Compressor Manufacturer ZHUHAI LANDA COMPRESSOR
CO.,LTD ZHUHAI LANDA COMPRESSOR CO.,LTD
Compressor Model QXA-B141zF030A QXA-B141zF030A
Compressor Oil 68EP 68EP
Compressor Type Rotary Rotary
Compressor LRA. A 25 25
Compressor RLA A 7.2 7.2
Compressor Power Input W 1440 1440
Compressor Overload Protector 1NT11L-6233 1NT11L-6233
Throttling Method Capillary Capillary
Set Temperature Range °F 60.8 ～86.0 60.8 ～86.0
Cooling Operation Ambient Temperature
Range °F 64 ～109 64 ～109
Heating Operation Ambient Temperature
Range °F / 19.4 ～75.2
Condenser Form Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Condenser Pipe Diameter inch Ф3/8 Ф3/8
Condenser Rows-n Gap inch 2-3/50 2-3/50
Condenser Coil Length (LXDXW) inch 33 2/7X1 2/3X26 33 2/7X1 2/3X26
Fan Motor Speed rpm 450/800 450/800
Fan Motor Power Output W 60 60
Fan Motor RLA A 0.37 0.37
Fan Motor Capacitor μF / /
Outdoor Unit Air Flow Volume CFM 1883 1883
Fan Type Axial-ow Axial-ow
Fan Diameter inch Φ20 1/2 Φ20 1/2
Defrosting Method /Automatic Defrosting
Climate Type T1 T1
Isolation I I
Moisture Protection IP24 IP24
Permissible Excessive Operating Pressure
for the Discharge Side PSIG 550 550
Permissible Excessive Operating Pressure
for the Suction Side PSIG 240 240
Sound Pressure Level (H/M/L) dB (A) 59/-/- 59/-/-
Sound Power Level (H/M/L) dB (A) 69/-/- 69/-/-
Dimension (WXHXD) inch 37 3/5X27 3/5X15 3/5 37 3/5X27 3/5X15 3/5
Dimension of Carton Box (LXWXH) inch 40 2/5X17 8/9X28 8/9 40 2/5X17 8/9X28 8/9
Dimension of Package (LXWXH) inch 40 1/2X18X29 1/2 40 1/2X18X29 1/2
Net Weight lb 108.0 114.7
Gross Weight lb 118 124.6
Refrigerant R410A R410A
Refrigerant Charge oz 56.4 65.3
Connection
Pipe
Connection Pipe Length ft 24.6 24.6
Connection Pipe Gas Additional Charge oz/ft. 0.2 0.3
Outer Diameter Liquid Pipe inch 1/4 1/4
Outer Diameter Gas Pipe inch 5/8 5/8
Max Distance Height ft 32.8 32.8
Max Distance Length ft 82 82
Note: The connection pipe applies metric diameter.
The above data is subject to change without notice. Please refer to the nameplate of the unit.

6Technical Information
Service Manual
2.2 Operation Characteristic Curve
2.3 Capacity Variation Ratio According to Temperature
Cooling Heating
0 10 20 30 40 50 60 70 80 90 100 1200 10 20 30 40 50 60 70 90 11080
11
10
9
8
7
6
5
4
3
2
1
0
Compressor speed (rps)
)A(tnerruC
11
10
9
8
7
6
5
4
3
2
1
0
Compressor speed (rps)
)A(tnerruC
220V
230V
240V
220V
230V
240V
•Conditions
Indoor DB 80F/WB 67 F
Outdoor : DB 95F/WB75F
Indoor air flow : Turbo
Pipe length : 24.6 ft.
•Conditions
Indoor : DB 70F/WB 60F
Outdoor : DB 47F/WB 43F
Indoor air flow : Turbo
Pipe length : 24.6 ft.
100
105
95
90
85
80
75
70
65
60
55
50
Outdoor temp. (F)
)%(oitaryticapaC
Outdoor temp. (F)
)%(oitaryticapaC
Conditions
Indoor: DB 80F/WB66.9F
Indoor air flow : Turbo
Pipe length: 24.6ft.
89.6 91.4 93.2 95 96.8 98.6 100.4 102.2 104 105.8 107.6 109.4
40
60
80
100
120
19.4 23 32 41 50
47
Conditions
Indoor: DB 70F
Indoor air flow : Turbo
Pipe length: 24.6ft.
Cooling Heating

7
Technical Information
Service Manual
2.4 Cooling and Heating Data Sheet in Rated Frequency
Rated cooling
condition (°F)
(DB/WB) Model
Pressure of gas
pipe connecting
indoor and
outdoor unit
Inlet and outlet pipe
temperature of heat
exchanger
Fan
speed of
indoor
unit
Fan
speed of
outdoor
unit
Compressor
revolution
(rps)
Indoor Outdoor P (MPa) T1 (°F) T2 (°F)
80/67 95/75
ACZEM4C4R18/ACZCI4C4R18
ACZEM4H4R18/ACZCI4H4R18 0.9 to 1.1 53.6 to 57.2 109.4 to 105.8
Turbo High
77
ACZEM4C4R24/ACZCI4C4R24
ACZEM4H4R24/ACZCI4H4R24 0.8 to 1.0 50 to 53.6 181.4 to 113 92
Rated heating
condition(°F)
(DB/WB) Model
Pressure of gas
pipe connecting
indoor and
outdoor unit
Inlet and outlet pipe
temperature of heat
exchanger
Fan speed
of indoor
unit
Fan
speed of
outdoor
unit
Compressor
revolution
(rps)
Indoor Outdoor P (MPa) T1 (°F) T2 (°F)
70/60 47/43 ACZEM4H4R18/ACZCI4H4R18 2.2 to 2.4 100.4 to 98.6 35.6to 39.2 Turbo High 80
ACZEM4H4R24/ACZCI4H4R24 2.5 to 2.7 111.2 to 107.6 32 to 37.4 86
2.5 Noise Curve
50
55
40
45
35
Indoor side noise
Indoor fan motor rotating speed
Compressor frequency/Hz
Low Middle High Super High
70
60
50
40
30
0 20 40 60 10080
Noise/dB(A)
Noise/dB(A)
ACZEM4C4R18
ACZEM4H4R18 ACZEM4C4R24 ACZEM4H4R24
Outdoor side noise
ACZCI4C4R18
ACZCI4H4R18 ACZCI4C4R24 ACZCI4H4R24
Cooling:
Heating:
Instruction:
T1: Inlet and outlet pipe temperature of evaporator
T2: Inlet and outlet pipe temperature of condenser
P: Pressure at the side of big valve
Connection pipe length: 24.6ft.

8Technical Information
Service Manual
3. Outline Dimension Diagram
3.1 Indoor Unit
Unit:inch
2
1 2/9
3 1/2
3 6/7
2 5/9
Ф2 1/6
Ф2 3/4 Ф2 3/4
5 3/7
27 1/3
27
7 2/3
7 2/7
W D
H
ACZEM4C4R18
ACZEM4H4R18
Model W H D
ACZEM4C4R18
ACZEM4H4R18 37 11 2/3 8
ACZEM4C4R24
ACZEM4H4R24 39 5/7 12 2/5 8 3/5
Ф2 1/6
ACZEM4C4R24
ACZEM4H4R24

9
Technical Information
Service Manual
3.2 Outdoor Unit
13 2/5 35
37 3/5
22
14 1/2
27 3/5
15 3/5
Unit:inch

10 Technical Information
Service Manual
4. Refrigerant System Diagram
Refrigerant pipe diameter
Liquid pipe : 1/4"
Gas pipe : 1/2"(For ACZEM4C4R18/ACZCI4C4R18 ACZEM4H4R18/ACZCI4H4R18)
Gas pipe : 5/8"(For ACZEM4C4R24/ACZCI4C4R24 ACZEM4H4R24/ACZCI4H4R24)
Cooling only model
Cooling and heating model
Indoor unit Outdoor unit
Indoor unit Outdoor unit
COOLING
HEATING
Accumlator
4-Way valve
Discharge
Suction
Discharge
Suction
Heat
exchanger
(evaporator)
Heat
exchanger
(evaporator) Heat
exchanger
(condenser)
Heat
exchanger
(condenser)
Valve
Valve
Valve
Valve
Liquid pipe
side
Gas pipe
side
Liquid pipe
side
Gas pipe
side
Strainer
Strainer Strainer
Capillary
Capillary
Compressor
Compressor
Accumlator

11
Technical Information
Service Manual
5. Electrical Part
5.1 Wiring Diagram
● Indoor Unit
●Instruction
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN Green CAP Jumper cap
YE Yellow BN Brown COMP Compressor
RD Red BU Blue Grounding wire
YEGN Yellow/Green BK Black / /
VT Violet OG Orange / /
Note: Jumper cap is used to determine fan speed and the swing angle of horizontal lover for this model.
Models: ACZEM4C4R18 ACZEM4H4R18
DISPLAY
RECEIVER AND
DISPLAY BOARD
AP1
DISP1 DISP2
ROOM
TEMP.
SENSOR TEMP. SENSOR
RT1 RT2
ROOMTUBE
PRINTED CIRCUIT BOARD
CABLE
CONNECTING
SWING-UD BLOCK
TERMINAL
AP2
JUMP
CAP
ELECTRIC BOX
G
BU
BN
XT
2
N(1)
M2
OUTDOOR UNIT
3
COM-OUT
N
AC-L
BK
YEGN
MAGNETIC
RING

TUBE
3
N(1)
2
L1
L2
L
G
G
SWING
L
G
EVAPORATOR
YEGN

MOTOR
FAN MOTOR
M1
PGFPG

12 Technical Information
Service Manual
Models: ACZEM4C4R24 ACZEM4H4R24
DISPLAY
RECEIVER AND
DISPLAY BOARD
AP1
DISP1 DISP2
Please don't touch any electronic component
or terminal when the machine is running,
stopping or has been powered off for less
than 3 minutes to prevent electric shock !
ROOM
TEMP.
SENSOR TEMP. SENSOR
RT1 RT2
ROOM
TUBE
PRINTED CIRCUIT BOARD
CABLE
CONNECTING
SWING-UD2
BLOCK
TERMINAL
AP2
JUMP
CAP
ELECTRIC BOX
G
BU
BN
XT
2
N(1)
M2
OUTDOOR UNIT
FAN MOTOR
3
COM-OUT
N
AC-L
BK
YEGN
MAGNETIC
RING

TUBE
3
N(1)
2
L1
L2
L
G
G
M1
DC-MOTOR
SWING
L
WARNING
G
EVAPORATOR
YEGN YEGN

PE
MOTOR

13
Technical Information
Service Manual
●Outdoor Unit
These wiring diagrams are subject to change without notice; please refer to the one supplied with the unit.
YEGN
X1
POWER
G
BU
BN
L2
L1
INDOOR UNIT
OUTTUBE TEMP.SENSOR OUTROOM TEMP.SENSOR EXHAUST TEMP.SENSOR
COMP
SAT
WH
WH
OVC_COMP
RDBU YE
RT3RT2RT1
COM_INNER
G
G
RDYEBU
2
3
XT1
BK
BN
BU N
AC_L
YEGN
T_SENSOR
3
2
L1
L2
L1
L2L2
G
MAGNETIC
RING
RING
MAGNETIC
TERMINAL
BLOCK
BLOCK
TERMINAL
XT
REACTOR
INDC2
OG
WH
INDC1
L
L4 L4
FAN MOTOR
G
YEGN
OFAN
G
M1
L3
G
PE
YEGN
WARNING
Please don't touch any electronic
component or terminal when the
machine is running , stopping or
has been powered off for less
than 30 minutes to prevent the
risk of electric shock !
L1
U V W
L5
L5
L5
MAGNETIC
RING
BK
WH
AP1
PRINTED CIRCUIT BOARD
W
V
UCOMP.
G
L2
L1
G
COMP.
W
V
U
X1
COMP
RD
BU YE
G
RDYEBU
YEGN
L2L2L2 MAGNETIC
RING
WH BK
RING
MAGNETIC
L5
L5
L5
WVU
(COMP-U)(COMP-V)(COMP-W)
L1
WARNING
YEGN
PE
G
L3
M1
G
OFAN
YEGN
G
FAN MOTOR L4
L4 L
INDC1
WH OG
INDC2
REACTOR

XT
TERMINAL
BLOCK BLOCK
TERMINAL
MAGNETIC
RING
G
L1
L1
N(1)
2
3
T_SENSOR
AC_L
N
BU
BN
BK
XT1
3
2
N(1)
COM_INNER
RT1 RT2 RT3
OVC_COMP
WH
WH SAT
TEMP.SENSOR EXHAUST TEMP.SENSOR OUTROOM TEMP.SENSOR OUTTUBE
INDOOR UNIT
L1
L2
BN
BU
G
POWER
YEGN
L1 L2
GPRINTED CIRCUIT BOARD
AP1
OVERLOAD PROTECTOR
4YV
VALVE
4-WAY
4V
Please don't touch any electronic
component or terminal when the
machine is running , stopping or
has been powered off for less
than 30 minutes to prevent the
risk of electric shock !
Models: ACZCI4C4R18 ACZCI4C4R24
Models: ACZCI4H4R18 ACZCI4H4R24

14 Technical Information
Service Manual
5.2 PCB Printed Diagram
8
9
10
1112
1
2
3
4 5 6 7
● Top view
● Bottom view
1Live wire interface
2Neutral wire interface
3Fuse
4PG Motor
5Auto button
6Up and down swing terminal
interface
7PG feedback
8IDU and ODU communication
interface
9 Display terminal interface
10 Jumper
11 Ambient temp. sensor
12 Tube temp. sensor
● Indoor Unit
Models: ACZEM4C4R18 ACZEM4H4R18

15
Technical Information
Service Manual
● Top view
● Bottom view
1 DC fan interface
2 Auto button
3Up and down swing terminal
interface
4 Display terminal interface
5 Jumper cap
6 Ambient temp. sensor
7 Tube temp. sensor
8IDU and ODU communication
interface
9 Live wire interface
10 Fuse
11 Neutral wire interface
12 Earth wire terminal interface
1 2 3
4
5
6789
10
11
12
Models: ACZEM4C4R24 ACZEM4H4R24

16 Technical Information
Service Manual
Outdoor Unit
● Top view
● Bottom view
1 2 3 4 5 6 7
8
9
10
11
12
13
1Compressor wiring
connection terminal
2ODU heat exchanger middle copper pipe
temp. sensor terminal
3Compressor overload
protection terminal
4ODU temp. sensor
terminal
5 EXV terminal
6Outdoor fan terminal
7Four-way valve
terminal
8Chassis electric heating
wiring terminal
9Communication cable
with IDU
10 Power supply live wire
11 Earth wire
12 Power supply neutral
wire
13 PFC inductance wire

17
Technical Information
Service Manual
6. Function and Control
6.1 Remote Controller Introduction
AUTO
COOL
DRY
FAN
HEAT
T-ON T-OFF
SWING
SLEEP
LOCK
SPEED
+
_
ON/OFF
FAN SWING
SLEEP TIMER
MODE
ON/OFF button
MODE button
+/- botton
FAN button
SWING button
SLEEP button
TIMER button
Icon Display on Remote Controller
Operation introduction of remote controller
For auto operation
Timer on Timer off
Sending signal
For air swing
For sleeping
For locking
For setting fan speed
Set temperature Set time
For cooling
For drying
For fan only
For heating
AUTO
COOL
DRY
FAN
HEAT
T-ON T-OFF
SWING
SLEEP
LOCK
SPEED
Buttons on Remote Controller
Note:
When power is connected(stand by condition), you can operate the air conditioner through the remote controller.
When unit is on, each time you press the button on remote controller, the sending signal icon on the display of remote controller
will blink once. If the air conditioner gives out a beep sound, it means the signal has been sent.
When unit is off, set temperature will be displayed on the remote controller(If the light of indoor unit display is turned on, the
corresponding icon will be displayed); When unit is on, it will display the icon of the on-going function.
1. ON/OFF Button
Press this button to turn unit on/off.
2. MODE Button
Pressing this button once can select your required mode circularly as below(the corresponding icon will be lit up after the mode is
selected): (Only for models with heating function.)