Lennox VEOA042N432U Installation instructions

VEOA042N432U
Thank you for selecting
INSTALLATION/OPERATION
INSTRUCTIONS
VEOutside Fresh Air Unit
VRF SYSTEMS
INDOOR UNITS
©2019 Lennox Industries Inc.
Dallas, Texas, USA
And valid combinations
(see instructions inside)
HW Hi-Wall
UM Universal Mount
CC Compact Cassette
4C 4-Way Cassette
1C 1-Way Cassette
2C 2-Way Cassette
HD High Static Fan Coil
SD Slim Fan Coil
LD Low Static Fan Coil
GD Large Fan Coil HS
AH Air Handler
OA Outside Fresh Air
Evaporator Types
Thank you for selecting LENNOX air conditioners.Please read this manual
carefully before operation and keep it for further reference.
K 230/60/3 and 220/50/3
N 380V/50-60Hz/3Ph
G 460V/60Hz/3Ph
Y 230V/60Hz/3Ph
T 220V/50Hz/1Ph
P 230V/60Hz/1Ph
U 220V/50-60Hz/1Ph
Voltage Rating
V E HW 007 N 4 32 PAvailable digit for future ref.
VE
HW
007
N
4
32
P
Evaporator Type: HW, UM, CC, 4C, 1C, 2C, HD, SD, LD, GD, AH, OA
Cooling Capacity MBtu/h
Certification Status: N: Non-certified; C: AHRI/ETL;
Refrigerant: 4: R410a
Voltage Rating: K, N, G, Y, T, P, U
Lennox Global VRF Unit
Internal Use
VEOA048N432U
VEOA076N432U
VEOA084N432U
VEOA096N432U

To Users
Thank you for selecting LENNOX’s 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 is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the appliance by a
person responsibility for their safety. Children should be supervised to ensure that
they do not play with the appliance.
(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 has gone through strict inspection and operational test before leaving the
factory. In order to avoid damage due to improper disassembly and inspection, which
may impact the normal operation of unit, please do not disassemble the unit by
yourself. You can contact with the special maintenance center of our company if
necessary.
(5) When the product is faulted and cannot be operated, please contact with our
maintenance center as soon as possible by providing the following information.
1)Contents of nameplate of product (model, cooling/heating capacity, product No.,
ex-factory date).
2)Malfunction status (specify the situations before and after the error occurs).
(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. We have the right to make necessary revision to the product from time to
time due to the reason of sales or production, and reserve the right to revise the
contents without further notice.
(7) The final right to interpret for this instruction manual belongs to LENNOX.

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 p
roduct 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 devi
ce, 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 ............................................................................................. 4
2.3 Working Temperature Range........................................................................................ 4
3 Preparations for Installation ................................................................................. 5
3.1 Standard Fittings .......................................................................................................... 5
3.2 Location for Installation ................................................................................................ 6
3.3 Requirements for Communication Line ........................................................................ 7
3.4 Wiring Requirements.................................................................................................... 8
4 Installation Instructions ........................................................................................ 8
4.1 Installation of Indoor Unit.............................................................................................. 8
4.2 Pipe Connection..........................................................................................................11
4.3 Installation and Test of Drain Pipe ...............................................................................11
4.4 Installation of Air Duct .................................................................................................14
4.5 Installation of Wired Controller ....................................................................................16
5 Wiring Work ......................................................................................................... 16
5.1 Connection of Wire and Patch Board Terminal ............................................................17
5.2 Power Cord Connection ..............................................................................................17
5.3 Connection of Communication Line of IDU and ODU ..................................................18
5.4 Connect Communication Wire of Wired Controller ......................................................18
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network .....................19
6 Routine Maintenance........................................................................................... 20
6.1 Cleaning of Filter.........................................................................................................21
6.2 Maintenance before the Seasonal Use........................................................................21
6.3 Maintenance after the Seasonal Use...........................................................................21
7 Table of Error Codes for Indoor Unit.................................................................. 21
8 Troubleshooting .................................................................................................. 22

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
1
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, voltage shall be
220-240V~50Hz or 208-230V~60Hz,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 is I.
Follow this instruction to
complete the installation work.
Please carefully read this
manual before unit startup and
service.
Installation should be
conducted by dealer or
qualified personnel.
Please do not attempt to
install the unit by
yourself. Improper
handling may result in
water leakage, electric
shock or fire disaster etc.
Before installation, please
check if the power supply is in
accordance with the
requirements specified on the
nameplate. And also take care
of the power safety.
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.
Be sure to use the exclusive
accessory and part to prevent
the water leakage, electric
shock and fire accidents.
If refrigerant leakage
happens during
installation, please
ventilate immediately.
Poisonous gas will
emerge if the refrigerant
gas meets fire.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
2
Wire size of power cord should
be large enough.The damaged
power cord and connection wire
should be replaced by
exclusive cable.
After connecting the
power cord, please fix the
electric box cover
properly in order to avoid
accident.
Never fail to comply with the
nitrogen charge
requirements.Charge nitrogen
when welding pipes.
Never short-circiut or
cancel the pressure
switch to prevent unit
damage.
Please firstly connect the wired
controller before energization,
otherwise wired controller can
not be used.
Before using the unit,
please check if the piping
and wiring are correct to
avoid water leakage,
refrigerant leakage,
electric shock, or fire etc.
Do not insert fingers or objects
into air outlet/inlet grille.
Open the door and
window and keep good
ventilation in the room to
avoid oxygen deficit when
the gas/oil supplied
heating equipment is
used.
Never start up or shut off the air
conditioner by means of directly
plug or unplug the power cord.
Turn off the unit after it
runs at least five minutes;
otherwise it will influence
oil return of the
compressor.
Do not allow children operate
this unit.
Do not operate this unit
with wet hands.
Turn off the unit or cut off the
power supply before cleaning
the unit, otherwise electric
shock or injury may happen.
Never spray or flush
water towards unit,
otherwise malfunction or
electric shock may
happen.
Do not expose the unit to the
moist or corrosive
circumstances.
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).
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.
Under cooling mode,
please don't set the room
temperature too low and
keep the temperature
difference between
indoor and outdoor unit
within 5°C.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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If anything abnormal happens
(such as burning smell), please
power off the unit and cut off
the main power supply, and
then immediately contact LENNOX
appointed service center.If
abnormality keeps going, the
unit might be damaged and
lead to electric shock or fire.
User is not allowed to
repair the unit. Fault
service may cause
electric shock or fire
accidents. Please contact
LENNOX 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 LENNOX.
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. According to the
different selected air volume, there are two kinds of connection method for the VRF fresh air
series indoor unit:
（1）
If the selected air volume≤2500m3/h, connect with normal indoor units by blow method,
or connect with the fixed outdoor unit as shown in（2）.
Model of Indoor Unit Model of Outdoor Unit
VEOA042N432U Connecting condition with VEOA-**N432U (or VEP-**N432K);
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.
VEOA048N432U
VEOA076N432U
VEOA084N432U
VEOA096N432U
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.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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Connection diagram of fresh air series indoor units and conventional VRF indoor units
（2）
If the selected air volume >2500m³/h, it can only connect the fixed outdoor unit as
below:
Model of Indoor Unit Model of Outdoor Unit
VEOA076N432U VEOA076N432U or VEOA076N432U or VEOA076N432U
VEOA084N432U VEOA096N432U or VEOA076N432U or VEOA096N432U
VEOA096N432U VEOA096N432U or VEOA076N432U or VEOA096N432U
Note：“-F” is for the power specification of 208/230V 3~ 60Hz; “-U” is for the power
specification of 440-460V 3~ 60Hz; “-X” is for the power specification of 380-415V 3N~
50/60Hz.
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
2.3 Working Temperature Range
— Outdoor Ambient Dry Bulb (°C)
Working Temperature Range -7 ~ 45

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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NOTE! 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.
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 VEOA042~48N432U
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) 8 PC
To be used together with
the hanger bolt for
installing the unit.
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.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
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No. Name Graphics Quantity Function
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! The fittings list above is subject to change without notice, please refer to the
packing list provided with indoor unit.
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
NOTES!
①.Installation of the unit must be in accordance with National Electric Codes and local
safety regulations.
②.Improper installation will affect unit’s performance, so do not install the unit by yourself.
Please contact local dealer to arrange professional technicians for the installation.
③.Do not connect power until all installation work is finished.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
7
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
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
polyvinyl
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 installed 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
8
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
(mm
2
/AWG)
Minimum Sectional
Area of Power Cord
(mm
2
/AWG)
VEOA042N432U 220~240V 1Ph 50Hz
208~230V 1Ph 60Hz
6 1.0/AWG18 1.0/AWG18
VEOA048N432U 220~240V 1Ph 50Hz
208~230V 1Ph 60Hz
6 1.0/AWG18 1.0/AWG18
VEOA076N432U 220~240V 1Ph 50Hz
208~230V 1Ph 60Hz
10 1.0/AWG18 1.0/AWG18
VEOA084N432U 220~240V 1Ph 50Hz
208~230V 1Ph 60Hz
10 1.0/AWG18 1.0/AWG18
VEOA096N432U 220~240V 1Ph 50Hz
208~230V 1Ph 60Hz
10 1.0/AWG18 1.0/AWG18
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 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).
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

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
9
Below are dimensions of A, B, C, etc. for different models:
Unit：mm
Model A B C D E F G
VEOA042N432U 1440 500 1530 300 754 1400 700
VEOA048N432U
1440
500
1530
300
754
1400
700
Fig 4.1.2
Below are dimensions of A, B, C, etc. for different models:
Unit：mm
Item
Model
A B C D E F G H I
VEOA076N432U 1353 632 992 1150 192 327 1483 791 385
VEOA084N432U 1353 632 992 1150 192 327 1483 791 385
VEOA096N432U 1353 632 992 1150 192 327 1483 791 385
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.
Fig 4.1.3 Fig 4.1.4

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
10
（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
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
bestrengthened 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.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
11
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.
（2）
Use a torque wrench to tighten up the flaring nut until the wrench gives out a click
sound.
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）
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.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
12
（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.
（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.Thermal sponge(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)
Fig 4.3.2 Fig 4.3.3
（4）
When connecting several drain pipes, follow the instruction as indicated in Fig 4.3.4.
Choose the drain collecting pipe that matches with unit capacity.
Fig 4.3.4

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
13
（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
（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.
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 recommend to do the drain test before ceiling decoration.

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
14
Fig 4.3.11
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 fixed 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 afilter 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 (offices, rest area, etc.).
4.4.1 Installation of Air-out Duct
（1）
Installation of the Rectangular Duct
Fig 4.4.1
No. Name No. Name
1 Hanger Rod 5 Static Pressure Box
2 Fresh Air Duct 6 Main Supply Air Duct
3 Canvas Duct 7 Supply Air Outlet
4 Fresh Air Inlet — —

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
15
（2）
Installation of Circular Duct
Fig 4.4.2
No. Name No. Name
1 Fresh Air Duct 6 Transition Pipe
2 Canvas Duct 7 Supply Air Duct
3 Fresh Air Blinds 8 Diffuser
4 Hanger Rod 9 Diffuser Connector
5 Supply Air Outlet — —
4.4.2 Shape and Size of Air-outlet and Air-return Opening
Unit: mm
Fig 4.4.3 Air Outlet
Fig 4.4.4 Air-Return Opening

Multi Variable Air Conditioners Fresh Air Series Indoor Unit
16
Unit: mm
Model
Size of Air Outlet Size of Air –returen Opening
A B C D
VEOA042N432U 197 1151 1362 264
VEOA048N432U 197 1151 1362 264
VEOA076N432U 192 992 1150 327
VEOA084N432U 192 992 1150 327
VEOA096N432U 192 992 1150 327
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 fire 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 fixed
wiring in accordance with the wiring rules.