Gree GMV-NX140P/A(X1.2)-K User manual

Change for life
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.
GREE reserves the right to interpret this manual which will be subject to any change due to
product improvement without further notice.
GREE Electric Appliances, Inc. of Zhuhai reserves the nal right to interpret this manual.
VRF Fresh Air Series Indoor Unit
Models:
GMV-NX140P/A(X1.2)-K
GMV-NX224P/A(X2.0)-M
GMV-NX280P/A(X2.5)-M
GMV-NX280P/A(X3.0)-M
GMV-NX450P/A(X4.0)-M
Air Conditioners
Owner's Manual

Preface
For correct installation and operation, please read all instructions carefully. Before reading the
instructions, please be aware of the following items:
(1) Execution standard: GB/T 25128-2010.
(2) For the safe operation of this unit, please read and follow the instructions carefully.
(3) During operation, total capacity of indoor units should not exceed the total capacity of outdoor
units. Otherwise, indoor units will not provide enough cooling or heating.
(4) Direct operators or maintainers should well keep this manual.
(5) If this unit fails to operate normally, please contact our appointed service center as soon as
possible and provide the following information:
●Content on the nameplate (model, cooling capacity, product code, ex-factory date) .
●Malfunction details (before and after the malfunction occurs).
(6) Each unit has been strictly tested and proved to be qualified before ex-factory. In order to
prevent units from being damaged or operating abnormally 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.
(7) All graphics in this manual are only for your reference. For sales or production reasons, these
graphics are subject to change by manufacturer without prior notice.
User Notice
●This appliance can be used by children aged from 8 years and above and persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge if they
have been given supervision or instruction concerning use of the appliance in a safe way and
understand the hazards involved. Children shall not play with the appliance. Cleaning and
user maintenance shall not be made by children without supervision.
●DISPOSAL:
This marking indicates that this product should not be disposed
with other household wastes. To prevent possible harm to the
environment or human health from uncontrolled waste disposal,
recycle it responsibly to promote the sustainable reuse of material
resources. To return your used device, please use the return and
collection systems or contact the retailer where the product was
purchased. They can take this product for environmental safe
recycling.
●If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
similarly qualied persons in order to avoid a hazard.

Contents
1 Safety Precautions .............................................................................................................. 1
2 Product Introduction ............................................................................................................. 3
2.1 Unit Introduction..........................................................................................................................3
2.2 Rated Working Condition............................................................................................................4
2.3 Working Temperature Range ......................................................................................................4
2.4 Unit Functions.............................................................................................................................4
3 Preparations for Installation.................................................................................................. 5
3.1 Standard Fittings.........................................................................................................................5
3.2 Location for Installation...............................................................................................................6
3.3 Requirements for Communication Line ...................................................................................... 6
3.4 Wiring Requirements ..................................................................................................................7
4 Installation Instructions......................................................................................................... 8
4.1 Installation of Indoor Unit ............................................................................................................8
4.2 Pipe Connection ....................................................................................................................... 10
4.3 Installation and Test of Drain Pipe ............................................................................................10
4.4 Installation of Air Duct ...............................................................................................................13
4.5 Installation of Wired Controller..................................................................................................17
5 Wiring Work........................................................................................................................ 17
5.1 Connection of Wire and Patch Board Terminal.........................................................................17
5.2 Power Cord Connection............................................................................................................18
5.3 Connection of Communication Line of IDU and ODU...............................................................18
5.4 Connect Communication Wire of Wired Controller ...................................................................19
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network ................................20
6 Routine Maintenance.......................................................................................................... 22
6.1 Cleaning of Filter.......................................................................................................................22
6.2 Maintenance before the Seasonal Use.....................................................................................22
6.3 Maintenance after the Seasonal Use........................................................................................22
7 Table of Error Codes for Indoor Unit................................................................................... 23
8 Troubleshooting.................................................................................................................. 23

Multi Variable Air Conditioners Duct Type Indoor Unit
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1 Safety Precautions
means items that must be forbidden! Otherwise, it may lead to personal injury or death or
serious damage.
means items that must be followed! Otherwise, it may lead to personal injury or property
loss.
Exclusive
accessory
exclusive
Follow this instruction to complete
the installation work. Please
carefully read this manual before
unit startup and service.
Please rstly connect the wired
controller before energization,
otherwise wired controller can
not be used.
Wire size of power cord should
be large enough.The damaged
power cord and connection wire
should be replaced by exclusive
cable.
Never fail to comply with the
nitrigen charge requirements.
Charge nitrogen when welding
pipes.
Before installation, please check if
the power supply is in accordance
with the requirements specied on
the nameplate. And also take care
of the power safety.
Installation should be conducted
by dealer or qualied personnel.
Please do not attempt to install the
unit by yourself. Improper handling
may result in water leakage,
electric shock or re disaster etc.
Be sure to use the exclusive
accessory and part to prevent the
water leakage, electric shock and
re accidents.
Before using the unit, please check
if the piping and wiring are correct
to avoid water leakage, refrigerant
leakage, electric shock, or re etc.
If refrigerant leakage happens
during installation, please ventilate
immediately. Poisonous gas will
emerge if the refrigerant gas meets
re.
After connecting the power cord,
please x the electric box cover
properly in order to avoid accident.
Never short-circiut or cancel the
pressure switch to prevent unit
damage.
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.
N 2

Multi Variable Air Conditioners Duct Type Indoor Unit
23
If anything abnormal happens
(such as burning smell), please
power off the unit and cut off
the main power supply, and
then immerdiately contact Gree
appointed service center.If
abnormality keeps going, the unit
might be damaged and lead to
electric shock or re.
User is not allowed to repair the
unit. Fault service may cause
electric shock or re accidents.
Please contact Gree appointed
service center for help.
Do not insert fingers or objects
into air outlet/inlet grille.
Never start up or shut off the air
conditioner by means of directly
plug or unplug the power cord.
Do not allow children
operate this unit.
Turn off the unit or cut off the
power supply before cleaning the
unit, otherwise electric shock or
injury may happen.
Do not expose the unit
to the moist or corrosive
circumstances.
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.
Open the door and window and
keep good ventilation in the room
to avoid oxygen decit when
the gas/oil supplied heating
equipment is used.
Turn off the unit after it runs at
least ve minutes; otherwise it
will inuence oil return of the
compressor.
Do not operate this unit
with wet hands.
Never spray or ush water
towards unit, otherwise
malfunction or electric shock
may happen.
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).
Under cooling mode, please
don't set the room temperature
too low and keep the
temperature difference between
indoor and outdoor unit within
5.
＜5Min
24H
26
C
30
C

Multi Variable Air Conditioners Duct Type Indoor Unit
2 3
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.
2 Product Introduction
2.1 Unit Introduction
VRF fresh air series indoor unit is a kind of air processing unit that inhales the fresh air from
outdoor side and then processes it to provide for the user in the room. Fresh air series indoor unit has
two kinds of connection according to different models:
(1) The following models can be connected to the same outdoor unit with conventional VRF
indoor units.
Model of Indoor Unit Model of Outdoor Unit
GMV-NX140P/A(X1.2)-K Connecting condition with GMV-**WM/B-X series modular outdoor unit:
1) The total capacity of connected fresh air series indoor units and conventional
VRF indoor units must be within 50%~100% of the capacity of outdoor unit,
among which, the total capacity of connected fresh air indoor units cannot
exceed 30% of the capacity of outdoor unit.
2) Fresh air indoor units can operate independently. The total capacity of
connected fresh air indoor units cannot exceed 50%~100% of the capacity of
outdoor unit.
GMV-NX224P/A(X2.0)-M
GMV-NX280P/A(X2.5)-M
Note:
When fresh air series indoor units and conventional VRF indoor units will be connected, please
follow the capacity requirement strictly. The total capacity of connected fresh air indoor units cannot
exceed 30% of the capacity of outdoor unit, while the total capacity of indoor units shall be within
50%~100% of the capacity of outdoor unit. Otherwise, the comfortableness will be affected or even
the unit will be damaged.
Conventional VRF indoor units
VRF fresh air series indoor units
Connection diagram of fresh air series indoor units and conventional VRF indoor units
(2) The following models of indoor unit only can be connected in a xed combination.
Model of Indoor Unit Model of Outdoor Unit
GMV-NX280P/A(X3.0)-M GMV-280WM/B-X
GMV-NX450P/A(X4.0)-M GMV-450WM/B-X

Multi Variable Air Conditioners Duct Type Indoor Unit
45
Connection diagram of GMV-NX280P/A(X3.0)-M and GMV-NX450P/A(X4.0)-M
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 35 28 35 28
Rated Heating 7 6 7 6
Note: The unit design applies executive standard GB/T 25128-2010. The working condition shall
be tested.
2.3 Working Temperature Range
Outdoor Ambient Dry Bulb (°C)
Working Temperature Range -7 ~ 45
Notes:
① The working temperature range executes relevant requirements in national standard GB/T
25128-2010.
② The ex-factory set temperature is 18°C in cooling mode and 22°C in heating mode. If the user
needs to change the temperature setting, please contact after-sales service personnel.
2.4 Unit Functions
Unit Functions Wired Controller XK45 (Standard accessory)
Cooling Mode
Heating Mode
Fan Mode
Memory Function
Timer Function
Filter Cleaning Reminding Function
Light Function
Notes:
① √: included, X: not included.
② Please refer to the user manual of Wired Controller or Remote Controller for function details.

Multi Variable Air Conditioners Duct Type Indoor Unit
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3 Preparations for Installation
Notes: Product graphics are only for reference. Please refer to actual products. Unspecied
measure unit is mm.
3.1 Standard Fittings
Please use the supplied standard ttings listed below as instructed.
No. Name Graphics Quantity Function
1 Wired Controller 1 PC Control indoor unit
2
Screw M4X25 (Cross
recessed small pan head
screw)
3 PC Secure the wired controller
3 Drain Hose Sub-assy 1 Set Connect drain pipe
4 Union Nut Sub-assy 1 Set Connect exit pipe
5 Nut with Washer M10X8 4 PC Hang indoor unit
6Nut M10 (Type 1 Hex Nut
M10X8.4)) 4 PC Hang indoor unit
7Washer 10
(Spring Washer M10X2.6) 4 PC Hang indoor unit
8 Insulating Jacket of Header 1 PC Wrap the joint of header
9Insulating Jacket of Liquid-
in Pipe 1 PC Wrap the joint of liquid-in pipe
10 Sponge of Drain Pipe 2 PC Wrap the joint of drain pipe
11 Cable Tie 8 PC Wrap the joint sponge
12 Installation Paper Pattern / 1 PC For drilling hole in the ceiling
Note: The ttings list above is subject to change without notice, please refer to the packing list
provided with indoor unit.

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3.2 Location for Installation
(1) The top holder must be strong enough to support unit's weight.
(2) Drain pipe can drain water out easily.
(3) There is no obstacle at inlet or outlet. Please ensure good air circulation.
(4) In order to make sure the space for maintenance, please install the indoor unit according to
the dimension described below.
(5) Keep the unit away from heat source, inammable gas or smoke.
(6) This is a concealed ceiling type unit.
(7) Indoor unit, outdoor unit, power cord and electric wire should stay at least 1m from the TV
set and radio. Otherwise, these electric appliances may have image interference and noise.
(Even if the distance is 1m, when there is strong electric wave, noise may still occur.)
Unit: mm
Work area
Air supply pipe
Return Air pipe
Work area Air supply pipe Return Air pipe
Ceiling
95
Notes:
① Installation of the unit must be in accordance with National Electric Codes and local safety
regulations.
① 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.
① Do not connect power until all installation work is nished.
3.3 Requirements for Communication Line
Notes:
If the unit is installed in the place with strong electromagnetic interference, shielded wire must
be applied on the communication wire between indoor unit and wired controller. Twisted pair line with
shielding function must be applied on the communication wire between indoor unit and indoor unit
(outdoor unit).
3.3.1 Select communication line for indoor unit and wired controller
L=L01+L02+L1+L2+......+L(n-1)(n≤16)
L1
L01L02
Sub-master
Controller
Master
Controller
Indoor Unit 1 Indoor Unit 2 Indoor Unit 3 Indoor Unit n
L2 L(n-1)
Fig 3.3.1

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Wire Type Total Length of
Communication Line L(m) Wire Gauge (mm2) Wire Standard Remark
Light/Common PVC
Jacket Soft Wire L≤250 2×0.75~2×1.25 IEC 60227-5
The total length of
communication line
should not exceed 250m
3.3.2 Select communication line for indoor unit and indoor unit (outdoor unit)
Outdoor
unit1
Outdoor
unit 2
Outdoor
unit 3
Outdoor
unit 4
Indoor Unit 1 Indoor Unit 2 Indoor Unit n
LO1
L=LO1+LO2+LO3+Li1+Li2+.......+Lin(n≤80)
LO2 LO3 Lin
Fig 3.3.2
Wire Type
Total Length of
ommunication
Line L(m)
Wire Gauge (mm2) Wire Standard Remark
Light/Common PVC
Jacket Soft Wire L≤1000 ≥2×0.75 IEC 60227-5
If wire gauge is 2X1 mm2, then
it’s OK to increase the length of
communication line. But total
length should not exceed 1500m.
3.4 Wiring Requirements
(1) Power Cord Size and Air Switch Capacity
Model Power Supply
Air Switch
apacity
(A)
Minimum Sectional
Area of Ground
Wire(mm2)
Minimum
Sectional Area of
Power Cord(mm2)
GMV-NX140P/A(X1.2)-K 220-240V ~50Hz 6 1.0 1.0
GMV-NX224P/A(X2.0)-M 380-415V 3N ~50Hz 6 1.0 1.0
GMV-NX280P/A(X2.5)-M 380-415V 3N ~50Hz 6 1.0 1.0
GMV-NX280P/A(X3.0)-M 380-415V 3N ~50Hz 6 1.0 1.0
GMV-NX450P/A(X4.0)-M 380-415V 3N ~50Hz 6 1.0 1.0
Notes:
① The size of circuit breaker and power cord in above sheet is selected based on the max
power (max current) of unit.
② Above selection requirements of power cord size: Power cord size is based on multicore
copper core cable with operation temperature of 90°C when laying on wire groove at 40°C ambient
temperature (IEC 60364-5-523). If the operation condition is different, please calculate according to
national standard.
③ Above selection requirements of circuit breaker size: Circuit breaker size is based on ambient
temperature of 40°C when the circuit breaker is working. If the operation condition is different, please
calculate according to circuit breaker specication.
(2) Install circuit breaking device near the unit. The minimum distance between each stage of
circuit breaking should be 3mm (The same for both indoor unit and outdoor unit).

Multi Variable Air Conditioners Duct Type Indoor Unit
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4 Installation Instructions
4.1 Installation of Indoor Unit
4.1.1 Outline Dimension and Installation Spots
Equip with a service port after hanging 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.
GMV-NX140P/A(X1.2)-K
1155 207
420
250
1278
1382
Fig 4.1.1
GMV-NX224P/A(X2.0)-M; GMV-NX280P/A(X2.5)-M; GMV-NX280P/A(X3.0)-M
Air outlet
Air return
1194
1194
1560
910
292
342
Fig 4.1.1
GMV-NX450P/A(X4.0)-M
Air outlet
1040
868
1780 347
555
1450
Air return
Fig 4.1.1

Multi Variable Air Conditioners Duct Type Indoor Unit
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4.1.2 Punching of Bolt Spots and Bolt Installation
(1) Cut out the installation paper pattern according to the hook installation dimension of unit. Place the
installation paper pattern on the installation area as shown in Fig 4.1.4. Punch holes on the installation
area according to the 4 spots on the paper pattern; The punching diameter may refer to the diameter of
expansion bolt, about 60mm to 70mm depth, as shown in Fig 4.1.5.
Paper pattern
Hole diameterDrill hole according
to the hole site
60～70mm
Fig 4.1.4 Fig 4.1.5
(2) Insert the expansion bolt M10 into the hole and then drive the iron nail into the bolt, as shown in Fig 4.1.6.
Note:
The length of bolt can be based on the height of room. Bolt should be prepared by the user.
Expansion bolt
Fig 4.1.6
4.1.3 Lift the Unit
Lift up the unit to the ceiling and secure it on the bolt. Use specialized nut to secure the unit.
I
I
2:1
Fig 4.1.7
Notes:
① Before installation, please finish the preparation work of all pipes (connection pipe, drain
pipe) and wires (wired controller wire, connection wire of IDU and ODU) that need to be connected
with the indoor unit.
② Punch holes on the ceiling (air return opening or air outlet). Ceiling may have to be

Multi Variable Air Conditioners Duct Type Indoor Unit
10 11
strengthened to make it level and to prevent it from vibration. You may consult user or constructor for
details.
③ If the ceiling is not strong enough, you can install a beam bracket in a corner and secure the
unit on the beam.
4.1.4 Horizontal Alignment
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,
as shown in Fig 4.1.8.
Level
Fig 4.1.8
4.2 Pipe Connection
(1) Direct the flaring of copper pipe to the center of screwed connection and then screw the
aring nut tight as shown in Fig 4.2.
(2) Use a torque wrench to tighten up the aring nut until the wrench gives out a click sound.
pipe joint of indoor unit
wrench torque wrench
flaring nut pipe joint
Torque for tightening nut
Pipe diameter (mm) Torque (N·m)
Ф6.35 15~30
Ф9.52 35~40
Ф12.7 45~50
Ф15.9 60~65
Fig 4.2
(3) The pipe should not be bent too much or it may crack. Use a pipe bender when bending the
pipe.
(4) Use a sponge to wrap the uninsulated connection pipe and the joint. Then tie it tight with a
plastic tape.
4.3 Installation and Test of Drain Pipe
4.3.1 Notice for Installation of Drain Pipe
(1) The drain pipe should be as short as possible and slope downward for at least 1%~2% so that
condensate can drain out easily.
(2) Size of the drainage hose must not be smaller than that of the drain pipe.
(3) Install the drain pipe according to the following diagram and make it insulated. Improper
installation will lead to water leakage and furniture and other objects may get wet.
(4) You can buy local hard PVC pipe as drain pipe. When connecting the pipe, insert the end of
PVC pipe into the drain hole and then tighten it up with a drain hose and cable tie. Do not use

Multi Variable Air Conditioners Duct Type Indoor Unit
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adhesives to connect drain hole and drain hose.
(5) When the drain pipe is used for several equipments, the shared pipe should be about 100mm
lower than the drain hole of each equipment. In this case, use thicker pipe.
additional drainage pipe
insulating
pipe insulating tape
drainage pipe
of indoor unit
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.
① metal clamp(accessory)
② drain hose(accessory)
(3) Use sealing plate to make the pipe clamp and hose insulated, as shown in Fig 4.3.3.
① metal clamp(accessory)
② thermal sponge(accessory)
1 2
3
≤
4mm
1
2
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.
T Joint of Collecting Pipe
100 m
Fig 4.3.4
(5) For indoor units that have high pressure at the outlet of drain pipe, use water-sealed joint.
HH/2
Fig 4.3.5
(6) Install the trap as shown in following Fig 4.3.6.
(7) Install one trap for each unit.
(8) Convenience for cleaning trap in the future should be considered when installing it.

Multi Variable Air Conditioners Duct Type Indoor Unit
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Fig 4.3.6
(9) The horizontal pipe can be connected to vertical pipe in the same level; please select the
connection way as shown in following g.
NO1: Connection of drainage pipe joints (Fig 4.3.7)
NO2: Connection of downspout elbow (Fig 4.3.8)
NO3: Inserting pipe connection (Fig 4.3.9)
Connection of
drainage pipe joints
Connection of
downspout elbow
Inserting pipe connection
Fig 4.3.7 Fig 4.3.8 Fig 4.3.9
(10) The installation height of drain lifting pipe should be less than 850mm. It is suggested that
the drain lifting pipe should be 1%~2% angle downward to drain direction. If the drain lifting
pipe shall form a right angle with the unit, the lifting height must be less than 800mm.
Drain Hose
(Accessory)
Clamp(Accessory)
Drain Lifting Pipe
Roof
Hanger
1000-1500mm
1000mm
300mm
150mm
850mm
Fig 4.3.10
(11) 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 1000~1500mm.
1000-1500mm
Fig 4.3.11

Multi Variable Air Conditioners Duct Type Indoor Unit
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4.3.3 Test of Drainage System
●Models without water pump
(1) Fill some water to the water tray of indoor unit as following:
1) Connect the drain hose to the other drain connection pipe of water tray and ll about 1L water
(as shown in 4.3.12). (Remove the drain hose after nishing testing and then put on the plug
of water tray.)
2) Spray 1L water on evaporator with sprayer, as shown in 4.3.13.
Inject water
Drain Hose Assembly
Fig 4.3.11 Fig 4.3.12
3) Check if the water drains smoothly from the drain pipe and check if there is water leakage on
the connection pipe.
4) Arrange insulation of drain hose and pipe clamp after checking the drain system.
●Models with water pump
(1) Fill some water to the water tray of indoor unit as following:
1) Connect the drain hose to the other drain connection pipe of water tray and ll about 1L water
(as shown in 4.3.12). (Remove the drain hose after nishing testing and then put on the plug
of water tray.)
2) Spray 1L water on evaporator with sprayer, as shown in Fig 4.3.13.
(2) Start the water pump to check if water drains smoothly. The starting method of water pump is
as below:
1) If project debugging of unit has been done, please set the indoor unit in cooling or dry mode.
In this case, the water pump will operate automatically.
2) If electrical wiring of unit hasn’t been done, please open the electric box cover. Connect one
phase power cord (220V~50Hz) at L1, N or L, N of wiring board; Connect the grounding
wire securely and then put on the electric box cover after making sure it is connected
securely; About 60s after connecting power supply, indoor unit will report “C0” communication
malfunction. In this case, the water pump will automatically operate for 10min and then stop;
After checking the drain system, please cut off power supply, disconnect power cord and then
put on the electric box cover.
(3) Check if the water drains smoothly from the drain pipe and check if there is water leakage on
the connection pipe.
(4) Arrange insulation of drain hose and pipe clamp after checking the drain system.
4.4 Installation of Air Duct
Notes:
① There 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.
② Each air-out duct and air-return duct should be xed on a pre-made board with iron frame.
The junction of air duct should be well-sealed in order to prevent air leakage.
③ The design and construction of air duct should comply with national requirements.
④ The edge of air-return duct is suggested to be more than 150mm away from the wall. Add a

Multi Variable Air Conditioners Duct Type Indoor Unit
14 15
lter to the air-return opening.
⑤ Please 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(ofces, rest area, etc.).
4.4.1 Installation of Air-out Duct
(1) Installation of the Rectangular Duct
4 6 83 75
1
2
3
Return air Supply air Return air
Fig 4.4.1
No. Name No. Name
1 Hanger Rod 5 Static Pressure Box
2Return Air Duct 6 Filter Screen
3 Canvas Duct 7 Main Supply Air Duct
4Return Air Inlet 8Supply Air Outlet
(2) Installation of Circular Duct
1
2
4
35 6 7 8 9
Fig 4.4.2
No. Name No. Name
1Return Air Duct 6 Transition Pipe
2 Canvas Duct 7 Supply Air Duct
3Return Air Blinds 8 Diffuser
4 Hanger Rod 9 Diffuser Connector
5Supply Air Outlet
4.4.2 Shape and Size of Air-outlet and Air-return Opening
(1) The following gure is applicable for the model GMV-NX140P/A(X1.2)-K
◆ Size of air-outlet opening

Multi Variable Air Conditioners Duct Type Indoor Unit
14 15
1155
207
22
Fig 4.4.3
◆ Size of air-return opening
1278
Fig 4.4.4
(2) The following figure is applicable for the models: GMV-NX224P/A(X2.0)-M; GMV-NX280P/
A(X2.5)-M; GMV-NX280P/A(X3.0)-M
◆ Size of air-outlet opening
292
1194
Fig 4.4.5
◆ Size of air-return opening
342
1194
Fig 4.4.6
(3) The following gure is applicable for the models: GMV-NX450P/A(X4.0)-M
◆ Size of air-outlet opening
868
347
Fig 4.4.7

Multi Variable Air Conditioners Duct Type Indoor Unit
16 17
◆ Size of air-return opening
1450
555
Fig 4.4.8
4.4.3 Installation of Air-return Duct
(1) Square ange is defaulted to be tted on the back before ex-factory. Air-return cover is on the
bottom, as shown in Fig 4.4.9.
Return Air Cover Plate
Bottom Return Air
Rear Return Air
Rectangular Flange
Fig 4.4.9
(2) If air return from the bottom is needed, switch the positions of square ange and air-return
cover.
(3) Use a clincher to connect air-return duct to the air-return opening of indoor unit. The other end
of air-return duct connects with the air-return louver. In order to adjust the height conveniently,
you can make a folded canvas duct and have it strengthened by 8# iron wire.
(4) Air return from the bottom will produce more noise than air return from the back. So we
suggest you to add a noise damper and static pressure case to lower noise if you choose air
return from the bottom.
(5) Select the appropriate installation way based on actual construction and maintenance needs,
as shown in Fig 4.4.10.
1
Return air Return air
Install the Return Air Duct (a)
Supply air Supply air
Install the Return Air Duct (b)
1
2
4
5
3
64
5
Fig 4.4.10

Multi Variable Air Conditioners Duct Type Indoor Unit
16 17
No. Name No. Name
1Return Air Inlet (with lter) 4 Indoor unit
2 Canvas Duct 5 Supply Air Duct
3Return Air Duct 6 Grille
4.5 Installation of Wired Controller
Please refer to User Manual of Wired Controller for the installation details.
Note:
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.
5 Wiring Work
Notes:
① For personal safety, the air conditioner must be properly grounded.
② Read carefully the voltage indicated on the nameplate before connecting wires. Then connect
wires according to the wiring diagram. Improper wiring will lead to abnormal operation or damage the unit.
③ Power capacity should be large enough. Sectional area of room wires should be above
2.5mm2.
④ For unit's power supply, please use specialized branch circuit and specialized power socket.
⑤ All wiring must comply with standards to ensure safe and correct operation.
⑥ Install specialized branch circuit breaker according to related laws and regulations and
electrical standards.
⑦ All wiring must use pressure terminal or single wire. Multi-twisted wire that connects directly
to the wiring board may cause re hazard.
⑧ Keep the wires away from refrigerant pipe, compressor and fan.
⑨ Do not alter the inner wires of air conditioner. Manufacturer does not assume responsibility
for damage or abnormal operation due to this reason.
⑩ If the unit is installed in places with strong electromagnetic interference, it's recommended
to use twin-twisted shield wire. During wire connection, please pay attention that the metal shield
layer of the twin-twisted wire must be grounded(outer case) in order to prevent the unit from
electromagnetic interference.
11
Communication line should be separated from the power cord and the connection wire of IDU
and ODU.
12
If the project needs higher static pressure, you can set it through the wired controller.
13
The appliance must be fitted with means for disconnection from the supply mains having
a contact separation in all poles that provide full disconnection under overvoltage category III
conditions, and these means must be incorporated in the xed wiring in accordance with the wiring
rules.
5.1 Connection of Wire and Patch Board Terminal
(1) The connection of wire (as shown in g 5.1.1)
1) Strip about 25mm 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 g 5.1.2)