Gree GMV-ND18PHS/A-T User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
Ducted Type Indoor Unit
Models:
GMV-ND18PHS/A-T (U)
GMV-ND24PHS/A-T (U)
GMV-ND30PHS/A-T (U)
GMV-ND36PHS/A-T (U)
GMV-ND42PHS/A-T (U)
GMV-ND48PHS/A-T (U)

Preface
For correct installation and operation, please read all instructions carefully. Before reading the
instructions, please be aware of the following items:
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
WARNING
This mark indicates procedures which, if improperly performed, might lead to the death
or serious injury of the user.
CAUTION
This mark indicates procedures which, if improperly performed, might possibly result in
personal harm to the user, or damage to property.
NOTICE is used to address practices not related to personal injury.
WARNING
(1) Instructions for installation and use of this product are provided by the manufacturer.
(2) Installation must be performed in accordance with the requirements of NEC and CEC by authorized personnel only.
(3) For the safe operation of this unit, please read and follow the instructions carefully.
(4) During operation, total capacity of indoor units should not exceed the total capacity of outdoor units. Otherwise, poor
effect of cooling or heating may result.
(5) Direct operators or maintainers should well keep this manual.
(6) If this unit fails to operate normally, please contact our service center as soon as possible and provide the following
information:
1) Content on the nameplate (model number, cooling capacity, production codex-factory date.
2) Malfunction details (before and after the malfunction occurs.
(7) Each unit has been strictly tested and proved to be qualified before ex-factory. In order to prevent units from being
damaged or operating normally because of improper disassembly, please do not disassemble the unit by yourself. If
you need to disassemble and check units, please contact our service center. We will send specialists to guide the
disassembly.
(8) Installation must be performed in accordance with the requirements of NEC and CEC by authorized personnel only.
User Notice
● This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have
been given supervision or instruction concerning use of the appliance by a person
responsible for their safety. Children should be supervised to ensure that they do not play
with the appliance.
● DISPOSAL: Do not dispose this product as unsorted municipal waste. Collection of such
waste separately for special treatment is necessary.

Contents
1 Safety Precautions........................................................................................................................ 1
2 Product Introduction...................................................................................................................... 2
2.1 Names of Key Components................................................................................................ 2
2.2 Rated Working Condition.................................................................................................... 2
3 Preparations for Installation .......................................................................................................... 3
3.1 Standard Fittings................................................................................................................. 3
3.2 Location for Installation....................................................................................................... 4
3.3 Requirements for Communication Line .............................................................................. 5
3.4 Wiring Requirements .......................................................................................................... 6
4 Installation Instructions.................................................................................................................. 7
4.1 Installation of Indoor Unit.................................................................................................... 7
4.2 Refrigerant Pipe Connection............................................................................................... 9
4.3 Installation of Indoor Unit.................................................................................................... 9
4.4 Installation of Air Duct....................................................................................................... 12
4.5 Installation of Wired Controller.......................................................................................... 15
4.6 External Static Pressure Settings..................................................................................... 15
5 Wiring Work................................................................................................................................. 16
5.1 Connection of Wire and Patch Board Terminal................................................................. 16
5.2 Power Cord Connection.................................................................................................... 17
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or indoor unit)
................................................................................................................................................. 17
5.4 Connect Communication Wire of Wired Controller........................................................... 18
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network......................... 19
6 Routine Maintenance .................................................................................................................. 21
6.1 Cleaning of Filter............................................................................................................... 21
6.2 Maintenance before the Seasonal Use ............................................................................ 21
6.3 Maintenance after the Seasonal Use................................................................................ 21
7 Table of Error Codes for Indoor Unit........................................................................................... 22
8 Troubleshooting........................................................................................................................... 22

Multi VariableAir Conditioners Ducted Type Indoor Unit
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1 Safety Precautions
WARNING
(1)This product can’t be installed at corrosive, inflammable or explosive environment or the place with special
requirements, such as kitchen. Otherwise, it will affect the normal operation or shorten the service life of the
unit, or even cause fire hazardor serious injury. As for above specialplaces, please adopt special air conditioner
with anti-corrosive or anti-explosion function.
(2) Follow this instruction to complete the installation work. Please carefully read this manual before unit startup
and service.
(3) Wire size of power cord should be large enough. The damaged power cord and connection wire should be
replaced by exclusive cable.
(4) After connecting the power cord, please fix the electric box cover properly in order to avoid accident.
(5) Never fail to comply with the nitrogen charge requirements. Charge nitrogen when welding pipes.
(6) Never short-circuit or cancel the pressure switch to prevent unit damage.
(7) Please firstly connect the wired controller before energization, otherwise wired controller cannot be used.
(8) Before using the unit, please check if the piping and wiring are correct to avoid water leakage, refrigerant
leakage, electric shock, or fire etc.
(9) Do not insert fingers or objects into air outlet/inlet grille.
(10) Open the door and window and keep good ventilation in the room to avoid oxygen deficit when the gas/oil
supplied heating equipment is used.
(11) Never start up or shut off the air conditioner by means of directly plug or unplug the power cord.
(12) Turn off the unit after it runs at least five minutes; otherwise it will influence oil return of the compressor.
(13) Do not allow children operate this unit.
(14) Do not operate this unit with wet hands.
(15) Turn off the unit or cut off the power supply before cleaning the unit, otherwise electric shock or injury may
happen.
(16) Never spray or flush water towards unit, otherwise malfunction or electric shock may happen.
(17) Do not expose the unit to the moist or corrosive circumstances.
(18) Under cooling mode, please don't set the room temperature too low and keep the temperature difference
between indoor and outdoor unit within 5℃(41℉).
(19) User is not allowed to repair the unit. Fault service may cause electric shock or fire accidents. Please
contact Gree appointed service center for help.
(20) Before installation, please check if the power supply is in accordance with the requirements specified on
the nameplate. And also take care of the power safety.
(21) Installation should be conducted by dealer or qualified personnel. Please do not attempt to install the unit
by yourself. Improper handling may result in water leakage, electric shock or fire disaster etc.
(22) Be sure to use the exclusive accessory and part to prevent the water leakage, electric shock and fire
accidents.
(23) Make sure the unit can be earthed properly and soundly after plugging into the socket so as to avoid
electric shock. Please do not connect the ground wire to gas pipe, water pipe, lightning rod or telephone line.
(24) Electrify the unit 8 hours before operation. Please switch on for 8 hours before operation. Do not cut off
the power when 24 hours short-time halting (to protect the compressor).
(25) If refrigerant leakage happens during installation, please ventilate immediately. Poisonous gas will emerge
if the refrigerant gas meets fire.
(26) Volatile liquid, such as diluent or gas will damage the unit appearance. Only use soft cloth with a little
neutral detergent to clean the outer casing of unit.
(27) If anything abnormal happens (such as burning smell), please power off the unit and cut off the main power
supply, and then immediately contact Gree appointed service center. If abnormality keeps going, the unit might
be damaged and lead to electric shock or fire.
Any personal injury or property loss caused by improper installation, improper debug,
unnecessary repair or not following the instructions of this manual should not be the responsibility
of Gree Electric Appliances, Inc. of Zhuhai.

Multi VariableAir Conditioners Ducted Type Indoor Unit
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2 Product Introduction
2.1 Names of Key Components
No.
①
②
③
④
⑤
Name
Filter
Air Inlet
Air Outlet
Fittings
Drain Pipe
2.2 Rated Working Condition
Indoor Side Condition
Outdoor Side Condition
Dry Bulb
Temp °C(℉)
Wet Bulb
Temp °C(℉)
Dry Bulb
Temp °C(℉)
Wet Bulb
Temp °C(℉)
Rated Cooling
26.7(80.0)
19.4(67.0)
35(95.0)
23.9(75.0)
Rated Heating
21.1(70.0)
15.6(60.0)
8.3(47.0)
6.1(43.0)

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3 Preparations for Installation
NOTICE! Product graphics are only for reference. Please refer to actual products. Unspecified
measure unit is mm(in.)
3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No.
Name
Appearance
Q'ty
Usage
1
Wired Controller
1
To control the indoor unit
2
Drain Hose Assembly
1
To connect with the hard PVC
drain pipe
3
Special Nut
1
To be used for connecting the
refrigerant pipe
4
M10X8 Nut with Washer
4
To be used together with the
hanger bolt for installing the unit.
5
M10 Nut (M10X8.4 Nut)
4
To be used together with the
hanger bolt for installing the unit.
6
M10 Washer (Spring
Washer M10X2.6)
4
To be used together with the
hanger bolt for installing the unit.
7
Insulation
1
To insulate the gas pipe
8
Insulation
1
To insulate the liquid pipe
9
Fastener
8
To fasten the sponge
10
Hanger
or
4
To fix the indoor unit
11
Nut with Washer
8
To fix the hook on the cabinet of
the unit.
12
paper pattern for
installation
1
Locate the drill hole on ceiling

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3.2 Location for Installation
(1) The appliance shall not be installed in the laundry.
(2) The top holder must be strong enough to support unit’s weight.
(3) Drain pipe can drain water out easily.
(4) There is no obstacle at inlet or outlet. Please ensure good air circulation.
(5) In order to make sure the space for maintenance, please install the indoor unit
according to the dimension described below.
(6) Keep the unit away from heating source, inflammable gas or smoke.
(7) This is a concealed ceiling type unit.
(8) Indoor unit, outdoor unit, power cord and electric wire should stay at least 1m (39-3/8
in.) from the TV set and radio. Otherwise, these electrical appliances may have image
interference and noise. (Even if the distance is 1m (39-3/8 in.), when there is strong
electric wave, noise may still occur.)
Unit: mm(in.)
Fig 3.2
(1) Installation of the unit must be in accordance with National Electric Codes and local
regulations.
(2) Improper installation will affect unit’s performance, so do not install the unit by yourself.
Please contact local dealer to arrange professional technicians for the installation.
(3) Do not connect power until all installation work is finished.

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3.3 Requirements for Communication Line
NOTICE!
If air conditioner used under strong electronic-magnetic interference circumstance, STP
(shielded twisted pair) communication cable must be adopted.
3.3.1 Select Communication Line for Indoor Unit and Wired Controller
Fig 3.3.1
Material type
Total length of
communication line
between indoor unit and
wired controller L (m/ft.)
Wire size
(mm2/AWG)
Material
Standard
Remarks
Light/Ordinary
polyvinyl
chloride
sheathed
cord. (60227
IEC 52
/60227 IEC
53)
L≤250m
(L≤820-1/5ft.)
2×0.75~2×1.
25
(2×AWG18~
2×AWG16)
IEC
60227-5
1. Total length of communication
line can't exceed 250m (820-
1/5ft.).
2. The cord shall be Circular cord
(the cores shall be twisted
together).
3. If unit is installed in places
with intense magnetic field or
strong interference, it is
necessary to use shielded
wire.
3.3.2 Select Communication Line for Indoor Unit and Outdoor Unit
Fig 3.3.2
Material Type
Total Length L
(m/ft.) of
Communication
Cable between
Indoor Unit and
Indoor (Outdoor)
Unit
Wire size
(mm2/AWG)
Material
Standard
Remarks
Light/Ordinary
polyvinyl
chloride
sheathed
cord. (60227
IEC 52
/60227 IEC
53)
L≤1000m
(L≤3280-5/6ft.)
≥2×0.75
(≥2×AWG18)
IEC 60227-5
1. If the wire diameter is enlarged to 2×1
mm2(2×AWG16), the total
communication line length can reach
1500 m (4921-1/4ft.).
2. The cord shall be Circular cord (the
cores shall be twisted together).
3. If unit is installed in places with intense
magnetic field or strong interference, it
is necessary to use shielded wire.

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3.4 Wiring Requirements
(1) Power Cord Size and Air Switch Capacity
Model
Power Supply
MCA(A)
MOP(A)
GMV-ND18PHS/A-T(U)
208/230V-1ph-60Hz
1.2
15
GMV-ND24PHS/A-T(U)
1.2
15
GMV-ND30PHS/A-T(U)
1.8
15
GMV-ND36PHS/A-T(U)
1.8
15
GMV-ND42PLS/A-T(U)
2.0
15
GMV-ND48PHS/A-T(U)
2.0
15
(1) Use copper wire only as unit’s power cord. Operating temperature should be within its rated
value.
(2) If the power cord is more than 15 m (49-1/4 ft.) long, please increase properly the sectional
area of power cord to avoid overload, which may cause accident.
(3) Above selection requirements: Power cord size is based on BV single-core wire (2~4pc) at
40°(104°F) Ambient temperature when laying across plastic pipe. Air switch is D type and used
at 40°C (104°F). If actual installation condition varies, please lower the capacity appropriately
according to the specifications of power cord and air switch provided by manufacturer.
(4) Install cut-off device near the unit. The minimum distance between each stage of cut-off
device should be 3 mm (1/8 in.) (The same for both indoor unit and outdoor unit).

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4 Installation Instructions
4.1 Installation of Indoor Unit
4.1.1 Outline Dimension and Installation Spots
Equip with an inspection hatch after lifting the unit. For the convenience of maintenance, the
service port should be on one side of the electric box and below unit’s lower level.
(1) Below are the outline dimension applicable to indoor units
Fig 4.1.1
Below are dimensions of A, B, C, etc. for different models:
Unit: mm(in.)
Model
A
B
C
D
E
F
G
H
I
J
GMV-ND18PHS/A-T(U)
1101
(43-3/8)
517
(20-3/8)
820
(32-1/4)
1159
(45-5/8)
1271
(50)
558
(22)
1002
(39-1/2)
160
(6-1/4)
235
(9-1/4)
268
(10-1/2)
GMV-ND24PHS/A-T(U)
GMV-ND30PHS/A-T(U)
1101
(43-3/8)
748
(29-1/2)
820
(32-1/4)
1115
(43-7/8)
1229
(48-3/8)
775
(30-1/2)
979
(38-1/2)
160
(6-1/4)
231
(9-1/8)
290
(11-3/8)
GMV-ND36PHS/A-T(U)
GMV-ND42PHS/A-T(U)
GMV-ND48PHS/A-T(U)
4.1.2 Suspend the indoor unit
(1) Drill bolt holes and install bolts
1) Stick the reference cardboard on the installation position; drill 4 holes according to the
hole site on the cardboard as shown in fig 4.1.3; diameter of drilling hole is according
to the diameter of expansion bolt and the depth is 60-70mm(2-3/8~2-3/4 in.), as shown

Multi VariableAir Conditioners Ducted Type Indoor Unit
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in fig 4.1.4.
Fig 4.1.3 Fig 4.1.4
2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as
shown in fig 4.1.5, and then remove the paper pattern.
NOTICE!
The length of bolt depends on the installation height of the unit, bolts are field supplied.
Fig 4.1.5
(2) Install the indoor unit temporarily
Assemble suspension bolt on the expansion bolt, attach the hanger bracket to the suspension
bolt. Be sure to fix it securely by using a nut and washer from upper and lower sides of the hanger
bracket. The washer fixing plate will prevent the washer from falling.
NOTES!
①Before operation, please prepare all pipelines (connection pipe, drainage hose) and
wires (connection wire for wired controller, connection wire for indoor unit).
②When drilling holes on ceiling (air return outlet or air outlet), you can need to
reinforce the ceiling to prevent vibration. For detailes, please consult user or builder.
③If the strength of the ceiling is not good, please install a beam bracket, and then put
the unit on the beam bracket.
(3) Adjust the unit to the right position.
(4) Check the level of the unit
After the indoor unit is installed, remember to check the horizontal status of the whole unit. It
should be horizontal from front to back and slant 1% from left to right, following the drainage
direction.

Multi VariableAir Conditioners Ducted Type Indoor Unit
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Fig 4.1.6
(5) Remove the washer locating plate and then tighten the nut on it.
Fig 4.1.7
4.2 Refrigerant Pipe Connection
(1) Aim the flaring port of copper pipe at the center of screwed joint and then tighten the
flaring nut with hand as shown in fig 4.2.
(2) Tighten the flaring nut with torque wrench.
Fig.4.2
(3) Use pipe bend when bending the pipe and the bending angle should not be too small.
(4) Wrap the connection pipe and joint with sponge and then tie them firmly with tape.
4.3 Installation of Indoor Unit
4.3.1 Outline Dimension and Installation Spots
(1) The drainage pipe should be short and the gradient downwards should be at least
1%~2% in order to drain condensation water smoothly.
(2) The diameter of drainage hose should be bigger or equal to the diameter of drainage
pipe joint.
(3) Install drainage pipe according to the following fig and arrange insulation to the

Multi VariableAir Conditioners Ducted Type Indoor Unit
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drainage pipe. Improper installation may lead to water leakage and damp the furniture
and other things in the room.
(4) You can buy normal hard PVC pipe used as the drainage pipe. During connection,
insert the end of PVC pipe into the drainage hole and then tighten it with drainage hole
and wire binder. Can’t connect the drainage hole and drainage hole with glue.
(5) When the drainage pipelines are used for several units, the position of pipeline should
be about 100mm (4 in.) lower than the drainage port of each unit. In this case, thicker
pipes should be applied.
Fig 4.3.1
4.3.2 Drainage Pipe Installation
(1) Insert the drain hose into the drain hole and tighten it with tapes, as shown in Fig 4.3.2.
(2) Tighten the pipe clamp, with the distance between screw nut and hose smaller than
4mm (3/16 in.).
①metal clamp(accessory)
②drain hose(accessory)
(3) Use sealing plate to make the pipe clamp and hose insulated, as shown in Fig.4.3.3.
①metal clamp(accessory)
②thermal sponge(accessory)
Fig 4.3.2 Fig 4.3.3
(4) When connecting several drain pipes, follow the instruction as indicated in Fig 4.3.4.
Choose the drain collecting pipe that matches with unit capacity.
Fig 4.3.4
(5) Install the trap as shown in following Fig 4.3.5.

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Fig 4.3.5
(6) The horizontal pipe can be connected to vertical pipe in the same level; please select
the connection way as shown in following fig.
NO1: Connection of drainage pipe joints (Fig4.3.6)
NO2: Connection of downspout elbow (Fig4.3.7)
NO3: Inserting pipe connection (Fig4.3.8)
Fig 4.3.6 Fig 4.3.7 Fig 4.3.8
(7) The installation height of raising pipe for drainage should be lower than B. The gradient
from raising pipe towards drainage direction should be at least 1%~2%. If the raising
pipe is vertical with the unit, the raising height should be less than C.
Fig 4.3.9
Unit: mm(in.)
model
A
B(
C
GMV-ND18PHS/A-T (U)
GMV-ND24PHS/A-T (U)
GMV-ND30PHS/A-T (U)
GMV-ND36PHS/A-T (U)
GMV-ND42PHS/A-T (U)
GMV-ND48PHS/A-T (U)
150(5-7/8)
850(33-7/16)
800(31-1/2)

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(8) Drain pipes should have a downward slope of at least 1%~2%, in order to prevent pipes
from sagging, install hanger bracket at intervals of 1000~1500 mm (39-3/8~59 in.).
Fig 4.3.10
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is finished.
1) Inject approximately 1L purified water to drain pan from air vent, ensure that not to
splash the water over the electrical components (e.g. water pump. etc).
2) In case of commissioning finished, please energize the IDUs and switch to cooling or
dry mode, meanwhile, the water pump operates, you can check the draining through
the drain socket.
3) If communication wire is not connected, communication malfunction “C0” will occur
after 60s of energizing. In this case, the water pump operates automatically. Check if
the water pump drains normally through drainage port. The water pump will stop
automatically after running for 10mins.
(2) During the test, please carefully check the drainage joint, make sure no any leakage
occur.
(3) It is strongly recommend to do the drain test before ceiling decoration.
Fig 4.3.11
4.4 Installation of Air Duct
NOTICE!
①There should be insulating layer on air-out duct, air-return duct and fresh air duct to
avoid heat loss and moisture. Adhere a nail on the air duct and then add thermal
sponge with a layer of tin. Fasten it with a nail cover and then seal the junction with tin
tapes. You can also use other materials that have good insulation quality.
②Each air-out duct and air-return duct should be fixed on a pre-made board with iron
frame. The junction of air duct should be well-sealed in order to prevent air leakage.
③The design and construction of air duct should comply with national requirements.
④The edge of air-return duct is suggested to be more than 150mm(5-7/8 in.) away from
the wall. Add a filter to the air-return opening.

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⑤Please consider noise-damping and vibration damping for the design and construction
of air duct. Besides, noise source must be away from people. For instance, do not have
the air-return opening installed on top of the user (Offices, rest area, etc.).
4.4.1 Installation ofAir-out Duct
(1) Installation of the Rectangular Duct
Fig 4.4.1
No.
Name
No.
Name
1
Hanger Rod
5
Static Pressure Box
2
Return Air Duct
6
Main Supply Air Duct
3
Canvas Duct
7
Supply Air Outlet
4
Return Air Inlet
4.4.2 Shape and Size of Air Outlet andAir-return Opening
Fig 4.4.2 Air Outlet
Fig 4.4.3 Air-return Opening

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Unit: mm(in.)
Model
Size of Air Outlet
Size of Air –return Opening
A
B
C
D
GMV-ND18PHS/A-T(U)
GMV-ND24PHS/A-T(U)
158
(6-1/4)
818
(32-1/4)
994
(39-1/8)
195
(7-5/8)
GMV-ND30PHS/A-T(U)
GMV-ND36PHS/A-T(U)
GMV-ND42PHS/A-T(U)
GMV-ND48PHS/A-T(U)
158
(6-1/4)
818
(32-1/4)
100
(3-7/8)
206
(8-1/8)
4.4.3 Installation of the Return Air Duct
(1) The default installation location of the rectangular flange is at the back and the return
air cover plate is at the bottom, as shown in Fig 4.4.4.
Fig 4.4.4
(2) The installation method can be chosen with considering the conditions of the building
and maintenance etc., as shown in Fig 4.4.5.
Fig 4.4.5
Table 5 Installation of the return air duct
No.
Name
No.
Name
1
Return Air Inlet (with filter)
4
Supply Air Duct
2
Return Air Duct
5
Grille
3
Indoor unit

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4.5 Installation of Wired Controller
Please refer to User Manual of Wired Controller for the installation details.
When installation is finished, the unit must be tested and debugged before operation. Please
refer to Instruction Manual of ODU for auto addressing and debugging details.
4.6 External Static Pressure Settings
Unit parameters can be set in unit ON or OFF status.
(1) Long press FUNCTION button for 5s and the temperature zone displays “C00”; long press
FUNCTION button for another 5s to enter the interface of setting wired controller parameters.
“P00” is displayed in temperature zone;
(2) Press “▲” or “▼” button to select parameter code. Press MODE button to enter
parametersetting.Atthattime,parametervalueisblinking.Press “▲” or “▼” button to adjust
the parameter value and press ENTER/CANCEL button to finish setting.
(3) Press ENTER/CANCEL button to return to last step until exists setting parameters.
The parameter setting list is as following
Parameter code
Parameter name
Parameter range
Default value
Note
P30
Set static
pressure of
indoor fan motor
01-09: static
pressure level of
indoor fan motor
05
There are two kinds of static pressure
level:
5 levels: 03, 04, 05, 06, 07
9 levels: 01, 02, 03, 04, 05, 06, 07, 08,
09
Static pressure level range is different
for different models; the wired
controller will automatically select
static pressure level range of indoor
fan motor according to the model of
indoor unit.
(1) Under parameter setting status, FAN, TIMER, SLEEP and SWING button are invalid. Press
ON/OFF button to go back to home page, but not turning on/off the unit.
(2) If thelength of power cord is more than 15 m, please increase properly the sectional area of
power cord to avoid overload, which may cause accident.
External Static Pressure
static pressure level of indoor fan motor
0 inWG(0 Pa)
01
0.08 inWG(20 Pa)
02
0.16 inWG(40 Pa)
03
0.24 inWG(60 Pa)
04
0.28 inWG(70 Pa)
05

Multi VariableAir Conditioners Ducted Type Indoor Unit
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0.32 inWG(80 Pa)
06
0.34 inWG(85 Pa)
07
0.36 inWG(90 Pa)
08
0.40 inWG(100 Pa)
09
(1) Keep in mind that a shortage of airflow quantity or water leakage will result because the air
conditioner will be operated outside the rated range of airflow quantity if the external static
pressure is wrongly set.
(2) The Sound Pressure Level will change if the external static pressure is wrongly set.
5 Wiring Work WARNING
Before obtaining access to terminals, all supply circuits must be disconnected.
(1) Units must be earthed securely, or it may cause electric shock.
(2) Please carefully read the wiring diagram before carry out the wiring work, incorrect wiring
could cause malfunction or even damage the unit.
(3) The unit should be powered by independent circuit and specific socket.
(4) The wiring should be in accordance with related regulations in order to ensure the units
reliable running.
(5) Install circuit breaker for branch circuit according to related regulations and electrical
standards.
(6) Keep cable away from refrigerant pipings, compressor and fan motor.
(7) The communication wires should be separated from power cord and connection wire
between indoor unit
(8) Adjust the static pressure via wired controller according to site circumstance.
5.1 Connection of Wire and Patch Board Terminal
(1) The connection of wire (as shown in fig 5.1.1)
1) Strip about 25mm (1 in.) insulation of the wire end by stripping and cutting tool.
2) Remove the wiring screws on the terminal board.
3) Shape the tail of wire into ring by needle nose plier, and keep the gauge of ring in
accordance with screw.
4) Use the screwdriver for tightening the terminal.
(2) The connection of stranded wire (as shown in fig 5.1.2)
1) Strip about 10mm (3/8 in.) insulation of the end of stranded wire by stripping and

Multi VariableAir Conditioners Ducted Type Indoor Unit
17
cutting tool.
2) Loosen the wiring screws on terminal board.
3) Insert the wire into the ring tongue terminal and tighten by crimping tool.
4) Use the screwdriver for tightening the terminal.
Fig 5.1.1 Fig 5.1.2
5.2 Power Cord Connection
(1) Every unit should be equipped with a circuit breaker for short-circuit and overload
protection.
(2) In general, circuit breaker is at OFF status. During operation, all indoor units and outdoor
units belonging to the same system must be kept energized status. Otherwise, the unit can’t
operate normally.
Fig 5.2
●For units with single-phase power supply.
(1) Detach the electric box lid.
(2) Let the power cord pass through the wiring through-holes.
(3) Connect the power cord to terminal "L1, L2, “.
(4) Fix the power card with wiring clamp.
(5) The wire diameter of power cord can’t be less than 18AWG.
5.3 Connection of Communication Wire between Indoor Unit and Outdoor
Unit (or indoor unit)
(1) Detach the electric box lid.
(2) Let the Communication cable pass through the wiring through-holes.
(3) Connect the communication wire to terminal D1 and D2 of indoor 4-bit wiring board, as