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

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
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

To Users
Thank you for selecting Gree product. Please read this instruction manual carefully before installing
and using the product, so as to master and correctly use the product. In order to guide you to correctly
install and use our product and achieve expected operating effect, we hereby instruct as below:
(1) 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.
(2) In order to ensure reliability of product, the product may consume some power under stand-by
status for maintaining normal communication of system and preheating refrigerant and lubricant.
If the product is not to be used for long, cut off the power supply; please energize and preheat
the unit in advance before reusing it.
(3) Please properly select the model according to actual using environment; otherwise it may
impact the using convenience.
(4) 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 hazard or serious injury. As for above
special places, please adopt special air conditioner with anti-corrosive or anti-explosion
function.
(5) If the product needs to be installed, moved or maintained, please contact our designated dealer
or local service center for professional support. Users should not disassemble or maintain the
unit by themselves, otherwise it may cause relative damage, and our company will bear no
responsibilities.
(6) All the illustrations and information in the instruction manual are only for reference. In order to
make the product better, we will continuously conduct improvement and innovation. If there is
adjustment in the product, please subject to actual product.

Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss is caused by the
following reasons:
(1) Damage the product due to improper use or misuse of the product;
(2) Alter, change, maintain or use the product with other equipment without abiding by the
instruction manual of manufacturer;
(3) After verification, the defect of product is directly caused by corrosive gas;
(4) After verification, defects are due to improper operation during transportation of product;
(5) Operate, repair, maintain the unit without abiding by instruction manual or related regulations;
(6) After verification, the problem or dispute is caused by the quality specification or performance
of parts and components that produced by other manufacturers;
(7) The damage is caused by natural calamities, bad using environment or force majeure.

Contents
1 Safety Notices (Please be sure to abide them) ............................................................1
2 Product Introductions ....................................................................................................3
2.1 Unit Introduction ...................................................................................................................... 3
2.2 Rated Working Condition......................................................................................................... 5
2.3 Working Temperature Range................................................................................................... 5
3 Preparations for Installation ..........................................................................................5
3.1 Standard Fittings...................................................................................................................... 6
3.2 Location for Installation............................................................................................................ 6
3.3 Requirements for Communication Line ................................................................................... 7
3.4 Wiring Requirements ............................................................................................................... 8
4 Installation Instructions .................................................................................................9
4.1 Installation of Indoor Unit......................................................................................................... 9
4.2 Pipe Connection .................................................................................................................... 12
4.3 Installation and Test of Drain Pipe ......................................................................................... 12
4.4 Installation of Air Duct............................................................................................................ 15
4.5 Installation of Wired Controller .............................................................................................. 19
5 Wiring Work...................................................................................................................19
5.1 Connection of Wire and Patch Board Terminal...................................................................... 20
5.2 Power Cord Connection ........................................................................................................ 21
5.3 Connection of Communication Line of IDU and ODU ........................................................... 21
5.4 Connect Communication Wire of Wired Controller................................................................ 22
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network .............................. 23
6 Routine Maintenance....................................................................................................25
6.1 Cleaning of Filter ................................................................................................................... 25
6.2 Maintenance before the Seasonal Use ................................................................................. 25
6.3 Maintenance after the Seasonal Use .................................................................................... 25
7 The Table of Error Codes for Indoor Unit ...................................................................25
8 Troubleshooting............................................................................................................26

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1 Safety Notices (Please be sure to abide them)
WARNING: If not abide them strictly, it may cause severe damage to the unit or the
people.
NOTE: If not abide them strictly, it may cause slight or medium damage to the unit or the
people.
This sign indicates that the items must be prohibited. Improper operation may cause
severe damage or death to people.
This sign indicates that the items must be observed. Improper operation may cause
damage to people or property.
WARNING!
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 hazard or serious injury.
As for the above special places, please adopt special air conditioner with anti-corrosive or
anti-explosion function.
Follow this manual to complete
the installation work. Please
read this manual carefully
before turning on or repairing
the unit.
Installation should be
conducted by the dealer or
qualified personnel. Please do
not attempt to install the air
conditioner by yourself.
Improper installation may lead
to water leakage, electric shock
or fire hazard, etc.
Before installation, please
check whether the power
supply is complied with that
specified on the nameplate and
check the safety of the power
supply.
The air conditioner must be
grounded reliably for avoiding
electric shock. Please do not
connect the earthing wire to
gas pipe, water pipe, lightning
rod or telephone line.
Be sure to use special
accessories and parts for
installation to prevent water
leakage, electric shock and fire
hazard, etc.
If refrigerant leakage happens,
please ventilate the room
immediately.
Diameter of power cord should
be large enough. The damaged
power cord and connection wire
must be replaced with special
cables.
When the power cord is
connected, please fix the
electric box cover properly to
avoid safety accidents.
Never fail to comply with the
nitrogen-charging welding
process. Do charge nitrogen
when welding the pipes.
Never short circuit or cancel the
pressure switch to prevent unit
damage.

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As for the unit controlled by the
wired controller, connect the
wired controller well firstly and
then energize the unit;
otherwise, the unit can’t operate
normally.
When installation is finished,
please check whether the
drainage pipes, pipelines and
electric wires are connected
correctly to avoid water
leakage, refrigerant leakage,
electric shock or fire, etc.
Do not insert fingers or objects
into air outlet or air return grille.
Open the door and window
frequently to keep good
ventilation for avoiding oxygen
deficit when gas heater or oil
heater is used in the room.
Never plug in or unplug the
power plug directly to turn on or
turn off the air conditioner.
Once the air conditioner is
turned on, it can be turned off
only after it has operated for
5min at least; otherwise, it will
affect the oil return of
compressor.
Do not allow children to operate
this air conditioner. Do not operate this air
conditioner with wet hands.
The air conditioner can be
cleaned only when it has been
turned off and the power has
been cut off; otherwise, it may
cause electric shock or injury.
Never spray or flush water
towards the air conditioner;
otherwise, malfunction or
electric shock may happen.
Do not expose the air
conditioner to the moist or
corrosive environment.
Put through the power 8 hours
in advance before operation.
Do not cut off the power when
the air conditioner stops
operation for only about one
night (protect the compressor).
Volatile liquid, such as diluent or
gasoline, will damage the
appearance of air conditioner.
Only soft dry cloth and wet cloth
dipped with neutral detergent
can be used to clean the outer
case of air conditioner.
Under cooling mode, please
don't set the room temperature
too low; keep the temperature
difference between indoor and
outdoor within 5℃(41℉).
If there are any abnormal
circumstances (such as burning
smell, etc.), please turn off the
unit and cut off the main power
supply immediately, and then
contact Gree appointed service
center. If those abnormal
circumstances still exit, the unit
may be damaged and it may
lead to electric shock or fire
hazard.
Do not repair the unit by
yourself. Wrong maintenance
may cause electric shock or fire
hazard. Please contact Gree
appointed service center for
help.

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Any personal injury or property loss caused by improper installation, improper debug, and
unnecessary repair or not following the instructions of this manual should not be the responsibility of
Gree Electric Appliances, Inc. of Zhuhai.
Correct Disposal of this product
This marking indicates that this product should not be disposed with other
household wastes throughout the EU. 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.
2 Product Introductions
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 have three
kinds of connection according to different models:
(1) If the number of connected indoor units is more than one and connecting with conventional VRF
indoor units:
Optional indoor unit model
Connected
outdoor unit series
Connection condition
GMV-NX140P/A(X1.2)-K
GMV-NX224P/A(X2.0)-M
GMV-NX280P/A(X2.5)-M
GMV-NX280P/A(X3.0)-M
GMV5
GMV6
1)The total capacity of connected fresh air indoor units
cannot exceed 50%~100% of the capacity of outdoor
units;
2)The total capacity of connected fresh air indoor units
cannot exceed 30% of the capacity of outdoor units.
Fig 2.1.1 Connection diagram of outdoor unit is a single module

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Fig 2.1.2 Connection diagram of outdoor units is modular
(2) If the number of connected indoor units is more than one and all of them are VRF fresh air indoor
units:
Optional indoor unit model
Connected
outdoor unit series
Connection condition
GMV-NX140P/A(X1.2)-K
GMV-NX224P/A(X2.0)-M
GMV-NX280P/A(X2.5)-M
GMV-NX280P/A(X3.0)-M
GMV5
GMV6
GMV Slim*
The total capacity of connected fresh air indoor units cannot
exceed 50%~100% of the capacity of outdoor units.
GMV-NX450P/A(X4.0)-M GMV5
GMV6
1)Cannot match with other models of indoor units;
2)The total capacity of connected fresh air indoor units
cannot exceed 50%~100% of the capacity of outdoor
units.
Fig 2.1.3 Connection diagram of outdoor unit is a single module
Fig 2.1.4 Connection diagram of outdoor units is modular

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(3) If the number of connected indoor units is only one and it is VRF fresh air indoor unit:
Optional indoor unit model
Recommended
capacity of outdoor unit
Connected
outdoor unit series Connection condition
GMV-NX140P/A(X1.2)-K 14kW GMV Mini* The capacity of outdoor
unit is not less than the
recommended capacity
and cannot exceed 10% of
the recommended
capacity.
GMV-NX224P/A(X2.0)-M 22.4kW GMV5
GMV6
GMV Slim*
GMV-NX280P/A(X2.5)-M 28kW
GMV-NX280P/A(X3.0)-M 28kW
GMV-NX450P/A(X4.0)-M 45kW
GMV5
GMV6
Fig 2.1.5 Connection diagram of only one VRF fresh air indoor unit system
NOTES!
①Please match the outdoor unit in strict accordance with the above requirements, otherwise, the
comfortableness will be affected or even the unit will be damaged.
②If the VRF fresh air indoor unit match with GMV Slim series or GMV Mini series, please consult
technical staffs for details.
2.2 Rated Working Condition
-
Indoor Side Condition
Outdoor Side Condition
Dry Bulb Temp(℃) Wet Bulb Temp(℃) Dry Bulb Temp(℃) Wet Bulb Temp(℃)
Rated Cooling
35
28
35
28
Rated Heating
7
6
7
6
2.3 Working Temperature Range
-
Outdoor Ambient Dry Bulb(℃)
Working Temperature Range -7~45
NOTE!
The ex-factory set temperature is 18℃in cooling mode and 22℃in heating mode. If the user
needs to change the temperature setting, please contact after-sales service personnel.
3 Preparations for Installation
NOTE!
Product graphics are only for reference. Please refer to actual products. Unspecified measure unit is
mm.

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3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No.
Name
Graphics
Quantity
Function
1 Wired Controller 1 Control indoor unit
2 Union Nut Sub-assy 1 Connect exit pipe
NOTE!
The packed attachments should be subject to actual objects. If there are any alterations, there will
be no further notice.
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, inflammable 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
Fig.3.2
NOTES!
①Installation of the unit must be in accordance with National Electric Codes and local safety
regulations.

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②Improper 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.
③Do not connect power until all installation work is finished.
3.3 Requirements for Communication Line
NOTE!
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
Fig.3.3.1
Wire Type Total Length of
Communication Line L(m)
Numbers × Size
(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)
Fig.3.3.2
Wire Type
Total Length of
Communication
Line L(m)
Numbers × Size (mm²) Wire
Standard Remark
Light/Common PVC
Jacket Soft Wire L≤1000 ≥2×0.75 IEC 60227-5
If wire gauge is 2×1 mm², then it’s
OK to increase the length of
communication line. But total
length should not exceed 1500m.

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3.4 Wiring Requirements
(1) Power Cord Size and Air Switch Capacity
Model Power Supply Air Switch Capacity
(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!
①The size of circuit breaker and power cord in above sheet is selected based on the max power
(max current) of unit.
②Above selection requirements of power cord size: Power cord size is based on multicore copper
core cable with operation temperature of 90℃when laying on wire groove at 40℃ambient
temperature (IEC 60364-5-523). If the operation condition is different, please calculate
according to national standard.
③Above selection requirements of circuit breaker size: Circuit breaker size is based on ambient
temperature of 40℃when the circuit breaker is working. If the operation condition is different,
please calculate according to circuit breaker specification.
(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).

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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
Unit: mm
Fig.4.1.1
GMV-NX224P/A(X2.0)-M; GMV-NX280P/A(X2.5)-M; GMV-NX280P/A(X3.0)-M
Unit: mm
Fig.4.1.2

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GMV-NX450P/A(X4.0)-M
Unit: mm
Fig.4.1.3
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.
Unit: mm
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.

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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.
Unit: mm
Fig.4.1.7
NOTES!
①Before 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.
②Punch holes on the ceiling (air return opening or air outlet). Ceiling may have to be
strengthened to make it level and to prevent it from vibration. You may consult user or
constructor for details.
③If 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.
Fig.4.1.8

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4.2 Pipe Connection
(1) Direct the flaring of copper pipe to the center of screwed connection and then screw the flaring
nut tight as shown in Fig.4.2.
(2) Use a torque wrench to tighten up the flaring nut until the wrench gives out a click sound.
Fig.4.2
Torque for tightening nut
Pipe diameter (mm)
Torque (N·m)
Φ6.35
15~30
Φ9.52
35~40
Φ12.7
45~50
Φ15.9
60~65
Φ19.05
70~75
(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) It is not allowed to connect the condensate drain pipe into waste pipe or other pipelines which
are likely to produce corrosive or peculiar smell to prevent the smell from entering indoors or
corrupt the unit.
(2) It is not allowed to connect the condensate drain pipe into rain pipe to prevent rain water from
pouring in and cause property loss or personal injury.
(3) Condensate drain pipe should be connected into special drain system for air conditioner.
(4) The drain pipe should be as short as possible and slope downward for at least 1%~2% so that
condensate can drain out easily.
(5) Size of the drainage hose must not be smaller than that of the drain pipe.
(6) 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.
(7) 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
adhesives to connect drain hole and drain hose.

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(8) 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.
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. Model
with water pump will be provided with drain hose, while other models please prepare the drain
hose by yourself.
(2) Tighten the pipe clamp, with the distance between screw nut and hose smaller than 4mm.
Fig.4.3.2
(3) Use sealing plate to make the pipe clamp and hose insulated, as shown in Fig.4.3.3.
Unit: mm
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.
Unit: mm
Fig.4.3.4

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(5) Install the trap as shown in following Fig.4.3.5.
Fig.4.3.5
(6) Install one trap for each unit.
(7) Convenience for cleaning trap in the future should be considered when installing it.
(8) The horizontal pipe can be connected to vertical pipe in the same level; please select the
connection way as shown in following fig.
No.1: Connection of drainage pipe joints (Fig.4.3.6).
No.2: Connection of downspout elbow (Fig.4.3.7).
No.3: Inserting pipe connection (Fig.4.3.8).
Fig.4.3.6Fig.4.3.7Fig.4.3.8
(9) 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.
Unit: mm
Fig.4.3.9
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 fill about 1L
water (as shown in Fig.4.3.10). (Remove the drain hose after finishing testing and then put
on the plug of water tray).
2) Spray 1L water on evaporator with sprayer, as shown in Fig.4.3.11.

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Fig.4.3.10Fig.4.3.11
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 fill about 1L
water (as shown in Fig.4.3.10). (Remove the drain hose after finishing testing and then put
on the plug of water tray).
2) Spray 1L water on evaporator with sprayer, as shown in Fig.4.3.11.
(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 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 drains normally through drainage port. The water pump will stop
automatically after running for 10min.
(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!
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 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 of Air-out Duct
(1) Installation of the Rectangular Duct
Fig.4.4.1
(2) Installation of Circular Duct
Fig.4.4.2
4.4.2 Shape and Size of Air-outlet and Air-return Opening
(1) The following figure is applicable for the model GMV-NX140P/A(X1.2)-K
Size of air-outlet opening
Unit: mm
Fig.4.4.3