Gree Fresh Air Series User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
Fresh Air Series Indoor Unit
Models:
GMV-NDX125P/A-T
GMV-NDX140P/A-T
GMV-NDX224P/A-T
GMV-NDX250P/A-T
GMV-NDX280P/A-T

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.
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 r
esponsibly 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
qualified 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......................................................................................................... 5
2.3 Working Temperature Range................................................................................................... 5
3 Preparations for Installation ..........................................................................................6
3.1 Standard Fittings...................................................................................................................... 6
3.2 Location for Installation............................................................................................................ 7
3.3 Requirements for Communication Line ................................................................................... 7
3.4 Wiring Requirements ............................................................................................................... 9
4 Installation Instructions ...............................................................................................10
4.1 Installation of Indoor Unit....................................................................................................... 10
4.2 Pipe Connection .................................................................................................................... 12
4.3 Installation and Test of Drain Pipe ......................................................................................... 13
4.4 Installation of Air Duct............................................................................................................ 15
4.5 Installation of Wired Controller .............................................................................................. 17
5 Wiring Work...................................................................................................................17
5.1 Connection of Wire and Patch Board Terminal...................................................................... 18
5.2 Power Cord Connection ........................................................................................................ 18
5.3 Connection of Communication Line of IDU and ODU ........................................................... 19
5.4 Connect Communication Wire of Wired Controller................................................................ 20
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network .............................. 21
6 Routine Maintenance....................................................................................................23
6.1 Cleaning of Filter ................................................................................................................... 23
6.2 Maintenance before the Seasonal Use ................................................................................. 23
6.3 Maintenance after the Seasonal Use .................................................................................... 23
7 Table of Error Codes for Indoor Unit...........................................................................24
8 Troubleshooting............................................................................................................25

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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1 Safety Precautions
WARNING:If not abide strictly, it may cause severe damage to the unit or the people.
NOTE: If not abide strictly, it may cause slight or medium damage to the unit or the people.
This sign indicates that the operation 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 above special places, please
adopt special air conditioner with anti-corrosive or anti-explosion function.
This Multi VRF System shall only be connected to an appliance suitable for the same refrigerant.
All units in Manual Cover is a partial unit, complying with partial unit of IEC 60335-2-40:2018, and
must only be connected to other units that have been confirmed as complying to corresponding partial
unit requirements of this international standard.
The electrical interface shall comply with electrical security requirement, current shall be referred to
the table of “Dimension of power cord and capacity of air switch” in Section 3.4, and safety class of
construction isⅠ.
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.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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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.
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.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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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.
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 units have three
kinds of connection method for the VRF fresh air series indoor unit:
(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-NDX125P/A-T
GMV-NDX140P/A-T
GMV-NDX224P/A-T
GMV-NDX250P/A-T
GMV-NDX280P/A-T
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.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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Fig 2.1.1 Connection diagram of outdoor unit is a single module
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-NDX125P/A-T
GMV-NDX140P/A-T
GMV-NDX224P/A-T
GMV-NDX250P/A-T
GMV-NDX280P/A-T
GMV5
GMV6
GMV Slim*
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

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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Fig 2.1.4 Connection diagram of outdoor units is modular
(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-NDX125P/A-T
12kW
GMV Mini*
The capacity of outdoor unit
is
not less than the
recommended capacity and
cannot exceed 10% of th
e
recommended
capacity.
GMV-NDX140P/A-T
14kW
GMV-NDX224P/A-T 22.4kW
GMV5
GMV6
GMV Slim*
GMV-NDX250P/A-T 28kW
GMV-NDX280P/A-T 28kW
Fig 2.1.5 Connection diagram of only one VRF fresh air indoor unit system
Note:
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

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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.
3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No. Name Graphics Quantity Function
1 Wired Controller 1PC To control the indoor unit
2 Union Nut Sub-assy 1 Set To be used for connecting the
refrigerant pipe
3 Corrugated pipe 1 GMV-NDX125~140P/A-T
4 M10 Nut (Nut with Washer
M10×8) 4 PC To be used together with the hanger
bolt for installing the unit.
5 M10 Nut (M10×8.4) 4/8 PC
To be used together with the hanger
bolt for installing the unit.
GMV-NDX125~140P/A-T: 4
GMV-NDX224~280P/A-T: 8
6 M10 Washer
(Spring Washer M10×2.6) 4 PC To be used together with the hanger
bolt for installing the unit.
7* M10 Washer
(M10×Φ30×2.5) 4 PC To be used together with the hanger
bolt for installing the unit.
8 Insulation 1 PC To insulate the gas pipe
9 Insulation 1 PC To insulate the liquid pipe
10 Fastener 8 PC To fasten the sponge
11* Hanger 4 PC To fix the indoor unit
12* M8 Nut (M8×6.8) 8 PC To fix the hook on the cabinet of the
unit.
13* M8 Washer
(Spring Washer M8×2.1) 8 PC To fix the hook on the cabinet of the
unit.
14* M8 Washer
(M8×Φ16×1.5) 8 PC To fix the hook on the cabinet of the
unit.
15 Sponge of Drain Pipe 2 PC Wrap the joint of drain pipe
Note:
①No.7*, 11*~14* is only suitable to GMV-NDX224~280P/A-T.
②The packed attachments should be subject to actual objects. If there are any alterations, there
will be no further notice.

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3.2 Location for Installation
(1) Appliances are not accessible to the general public.
(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 heat 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 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 3.2.1
Note:
①Installation of the unit must be in accordance with National Electric Codes and local safety
regulations.
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).

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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3.3.1 Select communication line for indoor unit and wired controller
Fig 3.3.1
Material type
Total length of
communication lineCable
between IDU 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≤250(820-1/5)
2×0.75~2×1.25
(2×AWG18~
2×AWG16)
IEC 60227-5
1
）
The cord shall be Circular cord (the
cores shall be twisted together).
2）
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 indoor unit (outdoor unit)
Fig 3.3.2
Material Type
Total Length L(m) of
Communication Cable
between IDU Unit and
IDU (ODU ) Unit L(m(/ft.)
Wire size
(mm²/AWG)
Material
Standard Remarks
Light/Ordinary
p
olyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000(3280-5/6) ≥2×0.75
(≥2×AWG18) IEC 60227-5
1
）
If the wire diameter is enlarged to
2×1mm² (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 in
stalled in places with
intense magnetic field or strong
interference, it is necessary to use
shielded wire.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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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/AWG)
Minimum Sectional
Area of Power Cord
(mm²/AWG)
GMV-NDX125P/A-T 220-240V ~50Hz
208-230V ~60Hz 6 1.0/AWG18 1.0/AWG18
GMV-NDX140P/A-T 220-240V ~50Hz
208-230V ~60Hz 6 1.0/AWG18 1.0/AWG18
GMV-NDX224P/A-T 220-240V ~50Hz
208-230V ~60Hz 10 1.0/AWG18 1.0/AWG18
GMV-NDX250P/A-T 220-240V ~50Hz
208-230V ~60Hz 10 1.0/AWG18 1.0/AWG18
GMV-NDX280P/A-T 220-240V ~50Hz
208-230V ~60Hz 10 1.0/AWG18 1.0/AWG18
Note:
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°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.
③Above 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 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).

Multi Variable Air Conditioners Fresh Air Series 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.
Fig 4.1.1
Below are dimensions of A, B, C, etc. for different models:
Unit：mm
Model A B C D E F G
GMV-NDX125P/A-T
1440
500
1530
300
754
1400
700
GMV-NDX140P/A-T 1440 500 1530 300 754 1400 700
Fig 4.1.2
Below are dimensions of A, B, C, etc. for different models:
Unit:mm
Model A B C D E F
GMV-NDX224P/A-T 1353 632 992 1150 192 327
GMV-NDX250P/A-T 1353 632 992 1150 192 327
GMV-NDX280P/A-T 1353 632 992 1150 192 327

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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 4.1.3. 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 4.1.4.
Unit:mm
Fig 4.1.3 Fig 4.1.4
(2) Insert the expansion bolt M10 into the hole and then drive the iron nail into the bolt, as shown in
Fig 4.1.5.
Note: The length of bolt can be based on the height of room. Bolt should be prepared by the
user.
Fig 4.1.5
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.
Fig 4.1.6

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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Note:
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
bestrengthened 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 4.1.7.
Fig 4.1.7
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 4.2.1.
(2) Use a torque wrench to tighten up the flaring nut until the wrench gives out a click sound.
Fig 4.2.1
Pipe diameter (mm) Torque (N·m)
Ф6.35 15~30
Ф9.52 35~40
Ф12.7 45~50
Ф15.9 60~65
(3) The pipe should not be bent too much or it may crack. Use a pipe bender when bending the
pipe.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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(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.
(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

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(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
(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 4.3.6 Fig 4.3.7 Fig 4.3.8

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(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
(1) Please test drainage system after electric work is finished.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) During the test, please carefully check the drainage joint, make sure no any leakage occur.
(3) It’s strongly recommended to do the drain test before ceiling decoration.
Fig 4.3.10
4.4 Installation of Air Duct
Note:
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 afilter
to the air-return opening.
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.).

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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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
Fig 4.4.3 Air Outlet