ACPro AWHD(18)ND3GO User manual

AC Pro Multi-Zone Outdoor
18-24K Service Manual
AWHD(18)ND3GO
AWHD(24)ND3GO
(Refrigerant R410A)

Part Ⅰ : Technical Information 1
1. Summary 1
2. Specifications 2
3. Outline Dimension Diagram 6
4. Refrigerant System Diagram 7
5. Electrical Part 8
5.1 Wiring Diagram 8
5.2 PCB Printed Diagram 10
6. Function and Control 12
Part Ⅱ : Installation and Maintenance 14
7. Notes for Installation and Maintenance 14
8. Installation Manual 16
8.1 Electrical Connections 17
8.2 Installing the Outdoor Unit 18
8.3 Installation Dimension Diagram 19
8.4 Check after Installation 20
9. Troubleshooting 21
9.1 Flashing LED of Indoor/Outdoor Unit and Primary Judge-
ment
21
9.2 Malfunction Checking and Elimination 22
9.3 Maintenance Method for Normal Malfunction 35
10. Exploded View and Parts List 37
11. Removal Procedure 43
Appendix 56
Appendix 1: Reference Sheet of Celsius and Fahrenheit 56
Appendix 2: Configuration of Connection Pipe 56
Appendix 3: Pipe Expanding Method 57
Appendix 4: List of Resistance forTemperature Sensor 58
Table of Contents

1Technical Information
PART I : TECHNICAL INFORMATION
Outdoor Unit
AWHD(18)ND3GO
AGWHD(24)ND3GO
1. SUMMARY
1
Technical Information
Service Manual
1. Summary
Part Ⅰ: Technical Information
Outdoor Unit
GWHD(18)ND3EO
GWHD(18)ND3FO
GWHD(18)ND3GO
GWHD(24)ND3EO
GWHD(24)ND3FO
GWHD(24)ND3GO

2
Technical Information
2. SPECIFICATIONS
Model AWHD(18)ND3GO
Product Code CB228W07700
Power Supply
Rated Voltage V~ 208/230
Rated Frequency Hz 60
Phases 1
Cooling Capacity (max~min) Btu/h 18000(6155~6998)
Heating Capacity (max~min) Btu/h 19000(8530~22600)
Cooling Power Input (max~min) W 1440
Heating Power Input (max~min) W 1520
Cooling Current Input A6.62
Heating Current Input A6.61
Rated Power Input W 2800
Current Breaker A 25
EER (Btu/h)/W 12.50
COP (Btu/h)/W 12.50
Outdoor Unit
CompressorTrademark ZHUHAI LANDA COMPRESSOR CO.LTD
Compressor Model QXA-B141zF030A
Compressor Refrigerant Oil Type RB68EP
CompressorType Inverter Rotary
L.R.A A /
Compressor Rated Load Amp (RLA) A 10.82
Compressor Power Input W 1440
CompressorThermal Protector 1NT11L—6233
Throttling Method Electron expansion valve
Cooling Operation Ambient
Temperature Range F -0.4~118.4
Heating Operation Ambient Temperature Range F -4~75.2
Condenser Material Aluminum Fin-copperTube
Condenser Pipe Diameter inch Φ9/32
Rows-Fin Gap(mm) inch 2-1/18
Coil length (l) X height (H) X coil width (L) inch 33 1/2X1 /12X26
Fan Motor Speed (rpm) (H/M/L) rpm 630
Output of Fan Motor W 60
Fan Motor RLA A0.62
Fan Motor Capacitor μF /
Air Flow Volume of Outdoor Unit 1883
Fan Type-Piece CFM Axial-flow
Fan Diameter Φ20 1/2
Defrosting Method inch Automatic Defrosting
ClimateType T1
Isolation I
Moisture Protection IPX4
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5
Dimension (WXHXD) inch 38X27 9/16X15 39/64
Dimension of Package (LXWXH) inch 40 13/32X18X29
Dimension of Package (LXWXH) inch 40 1/2X18X29 1/2
Net Weight lb 114.7
Gross Weight lb 124.6
Refrigerant Charge R410A
Refrigerant Charge oz 56.45

3Technical Information
Outdoor Unit
Cross-sectional Area of Power Cable Conductor sq in 0.0062
Recommended Power Cable(Core) N 3
Connection Pipe Connection Method - Flare Connection
Not Additional Gas Connection Pipe Length ft 131.2
Connection Pipe Gas Additional Charge oz/ft. 0.2
Outer Diameter of Liquid Pipe1(AC Pro Allocation)
(Metric) inch 1/4
Outer Diameter of Liquid Pipe2(AC Pro Allocation)
(Metric) inch 1/4
Outer Diameter of Gas Pipe1(AC Pro Allocation)(Metric) inch 3/8
Outer Diameter of Gas Pipe2(AC Pro Allocation)(Metric) inch 3/8
Connection Pipe Max. Height Distance(indoor and
indoor) ft 32.8
Connection Pipe Max. Height Distance(indoor and out-
door and indoor up) ft 32.8
Connection Pipe Max. Height Distance(indoor and out-
door and outdoor up) ft 32.8
Max. equivalent connection pipe length(outdoor to last
indoor) ft 32.8
Connection Pipe Max. Length Distance(total lenght) ft 65.6
The above data is subject to change without notice; please refer to the nameplate of the unit.

4
Technical Information
Model AWHD(24)ND3GO
Product Code CB228W07800
Power Supply
Rated Voltage V~ 208/230
Rated Frequency Hz 60
Phases 1
Cooling Capacity (max~min) Btu/h 24000(7500~33000)
Heating Capacity (max~min) Btu/h 26000(7500~35000)
Cooling Power Input (max~min) W 1920
Heating Power Input (max~min) W 2050
Cooling Current Input A 8.35
Heating Current Input A8.9
Rated Power Input W 4550
Current Breaker A 35
EER (Btu/h)/W 12.5
COP (Btu/h)/W 12.7
Outdoor Unit
CompressorTrademark ZHUHAI LANDA COMPRESSOR CO.LTD
Compressor Model QXAS-D23zX090B
Compressor Refrigerant Oil Type RB68EP
CompressorType Inverter Rotary
L.R.A A /
Compressor Rated Load Amp (RLA) A 15.82
Compressor Power Input W 2550
CompressorThermal Protector 1NT11L—6233
Throttling Method Electron expansion valve
Cooling Operation Ambient
Temperature Range F -0.4~118.4
Heating Operation Ambient Temperature Range F -4~75.2
Condenser Material Aluminum Fin-copperTube
Condenser Pipe Diameter inch Φ2/7
Rows-Fin Gap(mm) inch 2-1/18
Coil length (l) X height (H) X coil width (L) inch 38 21/32X1 1/2X29 7/16
Fan Motor Speed (rpm) (H/M/L) rpm 800
Output of Fan Motor W 90
Fan Motor RLA A0.59
Fan Motor Capacitor μF /
Air Flow Volume of Outdoor Unit 2354
Fan Type-Piece CFM Axial-flow
Fan Diameter Φ21 43/64-2 39/64
Defrosting Method inch Automatic Defrosting
ClimateType T1
Isolation I
Moisture Protection IPX4
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5
Dimension (WXHXD) inch 38 37/64X31 7/64X17 21/64
Dimension of Package (LXWXH) inch 42 1/2X19X33
Dimension of Package (LXWXH) inch 42 43/64X19 13/64X33 43/64
Net Weight lb 153.2
Gross Weight lb 164.3
Refrigerant Charge R410A
Refrigerant Charge oz 77.6

5Technical Information
Outdoor Unit
Cross-sectional Area of Power Cable Conductor sq in 0.0051
Recommended Power Cable(Core) N 3
Connection Pipe Connection Method - Flare Connection
Not Additional Gas Connection Pipe Length ft 98.4
Connection Pipe Gas Additional Charge oz/ft. 0.2
Outer Diameter of Liquid Pipe1(AC Pro Allocation)
(Metric) inch 1/4
Outer Diameter of Liquid Pipe2(AC Pro Allocation)
(Metric) inch 1/4
Outer Diameter of Liquid Pipe2(AC Pro Allocation)
(Metric) inch 1/4
Outer Diameter of Gas Pipe1(AC Pro Allocation)(Metric) inch 3/8
Outer Diameter of Gas Pipe2(AC Pro Allocation)(Metric) inch 3/8
Outer Diameter of Gas Pipe2(AC Pro Allocation)(Metric) inch 3/8
Connection Pipe Max. Height Distance(indoor and
indoor) ft 32.8
Connection Pipe Max. Height Distance(indoor and out-
door and indoor up) ft 32.8
Connection Pipe Max. Height Distance(indoor and out-
door and outdoor up) ft 32.8
Max. equivalent connection pipe length(outdoor to last
indoor) ft 65.6
Connection Pipe Max. Length Distance(total lenght) ft 196.8
The above data is subject to change without notice; please refer to the nameplate of the unit.

6
Technical Information
3. OUTLINE DIMENSION DIAGRAM
AWHD(18)ND3GO
10 Technical Information
Service Manual
3. Outline Dimension Diagram
35 1/8
38
27 9/16
15 39/64
13 27/64
22
14 1/2
Unit:inch
Unit:inch
GWHD(18)ND3EO GWHD(18)ND3FO GWHD(18)ND3GO
GWHD(24)ND3EO GWHD(24)ND3FO GWHD(24)ND3GO
38 37/64
35 1/8 13 27/64
17 21/64
31 7/64
22
14 1/2
AWHD(24)ND3GO

7Technical Information
4. REFRIGERANT SYSTEM DIAGRAM
A1:A-unit electronic expansion valve
B1:B-unit electronic expansion valve
C1:C-unit electronic expansion valve
D1:D-unit electronic expansion valve
11
Technical Information
Service Manual
4. Refrigerant System Diagram
outdoor
indoor
D1
C1
B1
A1
filter
A heat exchanger
gas -liquid separator
inverter compressor
discharge silencer
discharge temperature
sensor
SP
4-way valve
outdoor heat exchanger
fan
high pressure switch
B heat exchanger
C heat exchanger
D heat exchanger
filter
filter
filter
filter
Note: Not available for 14K/18K
model
C2
C3
D3
D2
B3
B2
A2
A3
A1:
A-unit electronic expansion valve B1:B-unit electronic expansion valve
C1:C-unit electronic expansion valve D1:D-unit electronic expansion valve
A2:A-unit gas pipe temperature sensor B2:B-unit gas pipe temperature senso
r
C2:C-unit gas pipe temperature sensor D2:D-unit gas pipe temperature senso
r
A3:
A-unit liquid pipe temperature sensor B3:B-unit liquid pipe temperature sensor
C3:C-unit liquid pipe temperature sensor D3:D-unit liquid pipe temperature senso
r
Note: Not available for 14K/18K model
A2:A-unit gas pipe temperature sensor
B2:B-unit gas pipe temperature sensor
C2:C-unit gas pipe temperature sensor
D2:D-unit gas pipe temperature sensor
A3:A-unit liquid pipe temperature sensor
B3:B-unit liquid pipe temperature sensor
C3:C-unit liquid pipe temperature sensor
D3:D-unit liquid pipe temperature sensor

8
Technical Information
5. ELECTRICAL PART
5.1 WIRING DIAGRAM
Instruction
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN Green COMP Compressor
YE Yellow BN Brown Grounding wire
RD Red BU Blue / /
YEGN Yellow/Green BK Black / /
VT Violet OG Orange / /
OUTDOOR UNIT
AWHD(18)ND3EO AWHD(18)ND3FO AWHD(18)ND3GO
12 Technical Information
Service Manual
5. Electrical Part
5.1 Wiring Diagram
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN GREEN COMP Compressor
YE Yellow BN Brown Grouding wire
RD Red BU Blue
YEGN Yellow/Green BK Black
VT Violet OG Orange
● Outdoor Unit
●Instruction
GWHD(18)ND3EO GWHD(18)ND3FO GWHD(18)ND3GO
63610000144
N(1)
2
3
L2
3
2
L1
N(1)
3
2
N(1)
BLOCK
TERMINAL
BLOCK
TERMINAL
N(1)
2
3
θ
θθθ
INDOOR UNIT A
RT1
RT2
RT3 OUTTUBE
TEMP.SENSOR
OUTROOM
TEMP.SENSOR
EXHAUST
TEMP.SENSOR
4YV
COMP
M1
FAN MOTOR
EKV 5
5
BK
FB
YEGN
G
OFAN
G
G
EH
COMPRESSOR
BAND HEATER RD
RD
HEAT-C
BN
EKV
WH
55FA
RDBK
RT7RT6
TEMP.SENSORTEMP.SENSOR
RDBK
TEMP.SENSOR
LIQUID PIPE
TEMP.SENSOR
GAS PIPE
RT4 RT5
θ
BK
GY COM-INNER
BU
BN
BU
BU
BN
BU
YEGN
G
BU
N1
AC-L2
N2
E(PE)
AP2
N1
AC-L1
BN
AP1:Main Board
U
V
WRD
BU
YE
BU
RD
YE
L1
L1
G
W
X1
VU
4WAY
T-SENSOR
POWER
YEGN
XT1
XTA
XTB
L1
L2
COMP.
TERMINAL
BLOCK
L1
OVC-COMP
SAT
WH
WH
BLOCK
TERMINAL
TERMINAL
BLOCK
N(DC-) at AP1 is higher than 30V to
the voltage of terminal P(DC+) and
Please don't touch any terminal when
WARNING
prevent the risk of electrical shock!
N1
AC-L
N2
4-WAY VALVE
GAS PIPE LIQUID PIPE
BK
WH
VT
VT
QA YA QB YB
CONNECTOR
OVERLOAD
PROTECTOR
RD
RD
BOTTOM HEAT-B
EH
BOND HEATER
G
G
G
X2
X3 X4
X5
X6
ELECTRONIC
EXPANSION
VALVE B
VALVE A
EXPANSION
ELECTRONIC
L5
L5
L2 L3
L4
2L3L
θ
θ
TUBE-A TUBE-B
INDOOR UNIT B
WH BK
YEGN

9Technical Information
AWHD(24)ND3EO AWHD(24)ND3FO AWHD(24)ND3GO
13
Technical Information
Service Manual
GWHD(24)ND3EO GWHD(24)ND3FO GWHD(24)ND3GO
63633609
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These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.

10
Technical Information
5.2 PCB PRINTED DIAGRAM
AWHD(18)ND3EO AWHD(18)ND3FO AWHD(18)ND3GO
14 Technical Information
Service Manual
1
1
23 45678910
11
12
13
14
15
16
1 Terminal of compressor
2Terminal of low-temperature
cooling temperature sensor
3Overload protection terminal
of compressor
4Temperature sensor terminal
of outdoor unit
5High pressure protection
terminal
6Low pressure protection
terminal
7 Terminal of outdoor unit
8Electric heating belt terminal
of chassis
9 Terminal of 4-way valve
10 Electric heating belt terminal
of compressor
11
Terminal of temperature
sensor wire for liquid valve
and gas valve
12 Terminal of electronic
expansion valve
13
Terminal of communication wire
for indoor unit and outdoor unit
14 Neutral wire terminal for
communication
15 Live wire terminal
16 Neutral wire terminal
5.2 PCB Printed Diagram
● TOP VIEW
● BOTTOM VIEW
GWHD(18)ND3EO GWHD(18)ND3FO GWHD(18)ND3GO
No Name
1Terminal of compressor
2Terminal of low-
temperature cooling
temperature sensor
3 Overload protection
terminal of compressor
4 Temperature sensor
terminal of outdoor unit
5 High pressure protection
terminal
6Low pressure protection
terminal
7Terminal of outdoor unit
8 Electric heating belt
terminal of chassis
9Terminal of 4-way valve
10 Electric heating belt
terminal of compressor
11 Terminal of temperature
sensor wire for liquid valve
and gas valve
12 Terminal of electronic
expansion valve
13 Terminal of communication
wire for indoor unit and
outdoor unit
14 Neutral wire terminal for
communication
15 Live wire terminal
16 Neutral wire terminal

11 Technical Information
AWHD(24)ND3EO AWHD(24)ND3FO AWHD(24)ND3GO
15
Technical Information
Service Manual
1234 8756 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
● TOP VIEW
● BOTTOM VIEW
GWHD(24)ND3EO GWHD(24)ND3FO GWHD(24)ND3GO
1 Terminal of compressor
2 Low pressure protection terminal
3 High pressure protection terminal
4Overload protection terminal of
compressor
5Temperature sensor terminal of
outdoor unit
6 Electric heating terminal of chassis
7Electric heating terminal of
compressor
8 Terminal of outdoor unit
9 Terminal of 4-way valve
10 Temperature sensor for liquid valve
and gas valve for unit A
11 Temperature sensor for liquid valve
and gas valve for unit B
12 Temperature sensor for liquid valve
and gas valve for unit C
13 Temperature sensor for liquid valve
and gas valve for unit D
14 Electronic expansion vale for unit A
15 Electronic expansion vale for unit C
16 Electronic expansion vale for unit B
17 Electronic expansion vale for unit D
18 Communication wire with indoor unit
19 Neutral wire for counication
20 Live wire
21 Neutral wire
22 Reactor wire 1
23 Reactor wire 2
No Name
1Terminal of compressor
2Low pressure protection
terminal
3 High pressure protection
terminal
4 Overload protection
terminal ofcompressor
5Temperature sensor t
erminal of outdoor unit
6Electric heating terminal of
chassis
7Electric heating terminal of
compressor
8Terminal of outdoor unit
9Terminal of 4-way valve
10 Temperature sensor for
liquid valve and gas valve
for unit A
11 Temperature sensor for
liquid valve and gas valve
for unit B
12 Temperature sensor for
liquid valve and gas valve
for unit C
13 Temperature sensor for
liquid valve and gas valve
for unit D
14 Electronic expansion vale
for unit A
15 Electronic expansion vale
for unit C
16 Electronic expansion vale
for unit B
17 Electronic expansion
vale for unit D
18 Communication wire
with indoor unit
19 Neutral wire for
communication
20 Live wire
21 Neutral wire
22 Reactor wire 1
23 Reactor wire 2

12
Technical Information
6. FUNCTION AND CONTROL
FUNCTION CONTROL
1. Cooling mode
• If the compressor is stopped and the indoor unit reaches the cooling operation condition; the electronic expansion
valve, the outdoor fan and the compressor will all begin to operate.
• If the compressor stops suddenly, the outdoor fan will stop within 1 minute.
• When the unit converts to heating mode, the 4-way valve will be energized after the compressor has been at a
full stop for 2 minutes.
• The outdoor fan starts 5 seconds before the compressor turns on. When powering up the unit, the outdoor fan
will run 3 minutes on high speed and then it will run at set speed. The fan runs for a minimum period of 80
seconds for each setting adjusted by the user.
• When the compressor stops, the outdoor fan will run at present speed for 1 additional minute before stopping.
• Should the outdoor unit malfunction or should it go into Protection Mode, the indoor unit will maintain
operational status.
1.2. Dry mode (dehumidification mode)
• The dry mode process is the same as those in cooling mode.
• The 4-way valve shall be closed.
• Temperature setting range is 60.8F - 86.0F.
• Protection function will be the same as in cooling mode.
• If the compressor is stopped and the indoor unit reaches the cooling operation condition; the electronic expansion
valve, the outdoor fan and the compressor will all begin to operate.
If the compressor stops
1.3. Heating mode
• Temperature setting range is 60.8F - 86.0F.
• When the compressor stops, the outdoor fan will run at present speed for 1 additional minute before stopping.
• While in Heating Mode, the indoor unit will enter into cold air prevention status. When the unit stops (or is turned
off), the indoor unit enters into residual heat blowing status.
• The outdoor fan starts 5 seconds before the compressor turns on. When powering up the unit, the outdoor fan
will run 3 minutes on high speed and then it will run at set speed. The fan runs for a minimum period of 80
seconds for each setting adjusted by the user.
1.4 Fan mode
• Temperature setting range is 60.8F - 86.0F.
• The fan will operate at its user set speed on the indoor unit.
• Indoor fan can operate at HIGH, MEDIUM, LOW, or AUTO fan speed.
Protection Function
2.1 Mode Conflict Protection of Indoor Unit
• When the indoor unit is in basic mode, compare the mode of other indoor units to see if there is a conflict – such
as cooling mode in conflict with dry or heating mode(s).
• No matter which indoor unit operates first, the unit will run in heating mode.
2.2 Mode Conflict Protection of Indoor Unit
• When the tube temperature is low, the compressor raises the operational frequency. When the tube temperature
is high, the compressor frequency is restricted or lowers the operational frequency; when the tube temperature is
too high, the compressor protection stops running.
• If the discharge temperature protection continuously runs for 6 cycles, the compressor will shut down and fail
to run. The compressor will be able to run after cutting off power to the unit and restoring it after the capacitors
have been effectively rid of any residual charge. If the running time of the compressor is longer than 7 minutes,
the protection time record will be cleared.

13 Technical Information
2.3 Discharge Protection Function
• When the discharge temperature is low, the compressor raises the operational frequency. When the discharge
temperature is high, the compressor frequency is restricted or lowers the operational frequency; when the
discharge temperature is too high, the compressor protection stops running.
• If the discharge temperature protection continuously runs for 6 cycles, the compressor will shut down and fail
to run. The compressor will be able to run after cutting off power to the unit and restoring it after the capacitors
have been effectively rid of any residual charge. If the running time of the compressor is longer than 7 minutes,
the protection time record will be cleared.
2.4 Communication Malfunction
• If the outdoor unit does not receive communication from the indoor unit after 3 minutes of being powered-up,
the outdoor unit will infer that the indoor unit is not installed and will power down.
2.5 Overcurrent Protection
• Overcurrent protection of complete unit, phase wire protection, and compressor phase current protection.
2.6 Compressor High-Pressure Protection
• If the high-pressure switch is isolated for 3 seconds, the compressor will enter high-pressure protection mode
and will come to a complete stop. Simultaneously, the outdoor unit will send the signal – high pressure protection
engaged – to the indoor unit(s).
• Once high pressure protection mode has been engaged, the high pressure switch will be closed for 6 seconds and
the compressor will resume running after the power has been cutoff and restored.
2.7 Compressor Overload Protection
• When the compressor overload switch detects movement, the indoor unit will display malfunction and it will stop
the indoor unit from reaching the set temperature. When the compressor stops for more than 3 minutes and
the overload switch is reset, the unit will resume normal operating status automatically. If overload protection is
activated more than 6 times, the unit will fail to resume normal operation. It will only resume running after the
power has been cutoff and restored.
2.8 Compressor Phase-Lacking Protection
• If one of three phases is detected as open during power up of the compressor, the compressor will enter phase
lacking protection. The malfunction will automatically clear after 1 minute, the unit will restart and then attempt
to detect is phase lacking protection is still needed. If phase lacking protection is detected 6 times, the
compressor will not restart but will be able to run after power has been cutoff and restored. At this point, if the
run time of the compressor is 7 minutes without interruption, the protection record will be cleared and the system
will run under normal conditions.
2.9 IMP Protection
• When the IMP module protection is detected, the outdoor unit will stop the indoor unit from reaching the set
temperature. After the compressor has stopped for 3 minutes, the unit will resume normal operational status
automatically. If the IMP protection occurs more than 6 times, the system will completely stop and the send the
signal of module protection to the indoor unit. The unit cannot resume operational status automatically, it will
only resume running after the power has been cutoff and restored.

14
Technical Information
PART II : TECHNICAL INFORMATION
7. NOTES FOR INSTALLATION AND MAINTENANCE
SAFETY PRECAUTIONS:
IMPORTANT!
Please read the safety precautions carefully before
installation or prior to performing any maintenance.
Please follow instructions below.
• Maintenance or installation MUST be in accordance with
instructions.
• Comply with ALL local and national electrical codes.
• Pay attention to ALL warnings and cautions in this
manual.
• Any maintenance and/or installation shall be performed
by distributors or licensed and qualified individual.
• Electrical work MUST be performed by licensed
technician according to local regulations and the
instructions given in this manual.
• Use extreme caution when performing electrical
installation tasks – Electric shock can result in severe
injury or death.
WARNINGS!
ELECTRICAL SAFETY PRECAUTIONS
1. Disconnect power supply prior to ANY work.
2. The air conditioner is a specialized circuit that requires
its own power supply – this is not to be shared with ANY
other electrical appliances.
3. The air conditioner should be installed in a suitable
location and the power supply should be easily reachable
by ALL users.
4. During maintenance and installation, make sure wiring
terminals are securely fastened.
5. Ground wire MUST be firmly connected and NOT used
for other purposes.
6. Use protective accessories as necessary, (IE: protective
boards, cable-cross loop, wire clips, etc.).
7. Live wire, neutral wire, and ground wire MUST
correspond to the live wire, neutral wire, and ground wire
of the air conditioner.
8. Power cord and power connections MUST be free of
obstruction and CANNOT be compressed.
9. Should power cord or power connection become severed,
they MUST be repaired/replaced by qualified technician.
10. If the power cord or power connection wire is not
long enough, replace with specialized cable from
manufacturer before proceeding with installation or
repair. DO NOT elongate these wires.
11. An air switch MUST be installed if there is no plug found
on the air conditioner. The air switch MUST be all-pole
parting and the contact parting distance MUST be at
1/8” or greater.
12. All wires and pipes MUST be connected firmly prior to
supplying the unit with power.
13. Eliminate any electric leakage on the unit body.
14. Fuses MUST be replaced with fuse of the same
specification(s). DO NOT replace with copper wire or
conducting wire.
15. If the unit is being installed in a humid climate, a circuit
breaker MUST also be installed.
INSTALLATION SAFETY PRECAUTIONS
1. Select installation location according to the requirements
of this manual. (See the requirements of installation
section in this manual.).
2. Handle unit with care. If unit exceeds 44.09 pounds, use
the two-person lift technique to transport.
3. Use a sufficient fixing bolt when installing both the
indoor and outdoor unit(s). Ensure installation support is
firm.
4. Use safety belt and personal protection equipment
(PPE) while working above a height of 6’.
5. Use equipped components or appointed components
during installation.
6. Make sure to clear the unit of any/all foreign objects prior
to completion of installation.
REFRIGERANT SAFETY PRECAUTIONS
1. Avoid contact of fire and refrigerant as the combination
creates poisonous gas.
2. Use only specified refrigerant. DO NOT mix refrigerant
types. DO NOT allow air to remain in refrigerant lines as
this may lead to pipe rupture or other hazards.
3. Check entire system for refrigerant leaks prior to
completing installation.
Improper installation may lead to fire hazard,
explosion, electric shock or injury.

15 Technical Information
MAIN TOOLS FOR INSTALLATION AND MAINTENANCE
1. Level meter, measuring
tape
2. Screwdrivers 3. Impact drill, drill head, electric drill
4. Electroprobe 5. Universal meter 6.Torque wrench, open-end wrench, inner
hexagon spanner
7. Electronic leakage detector 8. Vacuum pump 9. Pressure meter
10. Pipe pliers, pipe cutter 11. Pipe expander, pipe bender 12. Soldering appliance, refrigerant container

16
Technical Information
Start installation
Preparation before installation
Read the requirements for
electric connection Select installation location Prepare tools
Select indoor unit
installation location
Select outdoor unit
installation location
Install wall-mounting frame,
drill wall holes
Connect pipes of indoor unit
and drainage pipe
Connect wires of
indoor unit
Bind up pipes and hang
the indoor unit
Install the support of
outdoor unit
(select it according to the
actual situation)
Fix outdoor unit
Make the bound pipes pass
through the wall hole and then
connect outdoor unit
Install drainage joint of
outdoor unit (only for cooling
and heating unit)
Connect pipes of outdoor unit
Connect wires of outdoor unit
Neaten the pipes
Vacuum pumping and leakage detection
Check after installation and test operation
Finish installation
8. INSTALLATION MANUAL
INSTALLATION PROCEDURE

17 Technical Information
8.1 ELECTRICAL CONNECTIONS
1. Remove the handle at the right side plate of the outdoor
unit (one screw).
2. Remove the cable clamp, connect the power connection
cable with the terminal at the row of connection and
fix the connection.The fitting line distributing must be
consistent with the indoor unit. terminal of line bank.
Wiring should meet that of indoor unit.
3. Fix power connection wire by wire clamp.
4. Ensure wire has been fixed well.
5. Install the handle.
Including an air switch with suitable capacity,
please note the following table. Air switch should
be included magnet buckle and heating buckle
function, it can protect the circuit-short and
overload. (Caution: please do not use thefuse only
for protect the circuit)
An all-pole disconnection switch having a contact
separation of at least 3mm in all pole should be
connected in fixed wiring.
Wrong wire connection may cause malfunction of
some electric components.After fixing cable, ensure
that leads between connection to fixed point have
some space.
The connection pipes and the connectiong wirings
of the unit A and unit B must be corresponding to
each other respective.
The appliance shall be installed in accordance with
national wiring regulations.
Note: the above figures are only intended to be
a simple diagram of the appliance and may not
correspond to the appearance of the units that have
been purchased.
!
!
!
!
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22 Installation and Maintenance
Service Manual
8.1 Electrical Connections
1. Remove the handle at the right side plate of the outdoor
unit (one screw).
2. Remove the cable clamp, connect the power connection
cable with the terminal at the row of connection and fix the
connection. The tting line distributing must be consistent with
the indoor unit. terminal of line bank. Wiring should meet that of
indoor unit.
3. Fix power connection wire by wire clamp.
4. Ensure wire has been xed well.
5. Install the handle.
Wrong wire connection may cause malfunction of some
electric components.After xing cable, ensure that leads
between connection to xed point have some space.
An all-pole disconnection switch having a contact
separation of at least 3mm in all pole should be connected
in xed wiring.
The connection pipes and the connectiong wirings of
the unit A and unit B must be corresponding to each
other respective.
The appliance shall be installed in accordance with
national wiring regulations.
Note: the above gures are only intended to be a simple
diagram of the appliance and may not correspond to the
appearance of the units that have been purchased.
Including an air switch with suitable capacity, please note
the following table. Air switch should be included magnet
buckle and heating buckle function, it can protect the
circuit-short and overload. (Caution: please do not use
thefuse only for protect the circuit)
GWHD(18)ND3EO GWHD(18)ND3FO
GWHD(18)ND3GO
L1
L2
To the power supply
To unit B
Power cord
To unit A
connecting
cable
L1
L2
Power cord
L1 L2
L1 L2
L1
L2
To the power supply
To unit A
L1 L2
GWHD(24)ND3EO GWHD(24)ND3FO
GWHD(24)ND3GO
connecting
cable
connecting
cable
To unit B
connecting
cable
To unit C
connecting
cable
C
C
AWHD(18)ND3EO AWHD(18)ND3FO
AWHD(18)ND3GO
AWHD(24)ND3EO AWHD(24)ND3FO
AWHD(24)ND3GO