Lennox VRF VEHD019N432U Installation instructions

VEHD019N432U
VEHD021N432U
VEHD024N432U
VEHD027N432U
VEHD031N432U
VEHD034N432U
VEHD038N432U
VEHD043N432U
VEHD048N432U
VEHD055N432U
Thank you for selecting
INSTALLATION/OPERATION
INSTRUCTIONS
VEHigh ESP Fan Coil
VRF SYSTEMS
INDOOR UNITS
©2016 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 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

Preface
For correct installation and operation, please read all instructions carefully. Before reading the
instructions, please be aware of the following items:
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
WARNING This mark indicates procedures which, if improperly performed, might lead to the death or
serious injury of the user.
CAUTION This mark indicates procedures which, if improperly performed, might possibly result in
personal harm to the user, or damage to property.
NOTICE is used to address practices not related to personal injury.
WARNING
(1) Instructions for installation and use of this product are provided by the manufacturer.
(2) Installation must be performed in accordance with the requirements of NEC and CEC by authorized personnel only.
(3) For the safe operation of this unit, please read and follow the instructions carefully.
(4) During operation, total capacity of indoor units should not exceed the total capacity of outdoor units. Otherwise,
poor effect of cooling or heating may result.
(5) Direct operators or maintainers should well keep this manual.
(6) If this unit fails to operate normally, please contact our service center as soon as possible and provide the following
information:
1) Content on the nameplate (model number, cooling capacity, production code, ex-factory date.
2) Malfunction details (before and after the malfunction occurs.
(7) Each unit has been strictly tested and proved to be qualified before ex-factory. In order to prevent units from being
damaged or operating normally because of improper disassembly, please do not disassemble the unit by yourself. If
you need to disassemble and check units, please contact our service center. We will send specialists to guide the
disassembly.
(8) Installation must be performed in accordance with the requirements of NEC and CEC by authorized personnel only.
User Notice
●This appliance 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.
● Under the standby status, the unit will consume a little power for ensuring reliability of complete unit,
maintaining normal communication and preheating refrigerant. When the unit won’t be used for a long
time, cut off the power of the complete unit. However, please preheat it when operating the unit next
time.
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.
R410A(R32/125:50/50):2087.5

Contents
1 Safety Precautions .................................................................................................. 1
2 Product Introduction ................................................................................................ 3
2.1 Names of Key Components ............................................................................................... 3
2.2 Rated Working Condition ................................................................................................... 3
2.3 Unit Functions ................................................................................................................... 3
3 Preparations for Installation ..................................................................................... 4
3.1 Standard Fittings................................................................................................................ 4
3.2 Location for Installation ...................................................................................................... 5
3.3 Requirements for Communication Line ............................................................................. 5
3.3.1 Select communication line for indoor unit and wired controller ................................ 5
3.3.2 Select communication line for indoor unit and outdoor unit ..................................... 6
3.4 Wiring Requirements ......................................................................................................... 7
4 Installation Instructions ............................................................................................ 8
4.1 Installation of Indoor Unit ................................................................................................... 8
4.1.1 Outline Dimension and Installation Spots ................................................................ 8
4.2 Refrigerant Pipe Connection ........................................................................................... 10
4.3 Drainage Pipe Installation and Drainage System Testing ................................................ 11
4.3.1 Notice for Installation of Drain Pipe ....................................................................... 11
4.3.2 Drainage pipe installation ...................................................................................... 11
4.3.3 Test of Drainage System ....................................................................................... 13
4.4 Installation of Air Duct ...................................................................................................... 13
4.4.1 Installation of Air-out Duct ...................................................................................... 13
4.4.2 Shape and Size of Air Outlet and Air-return Opening ............................................ 14
4.4.3 Installation of the Return Air Duct .......................................................................... 15
4.5 Installation of Wired Controller......................................................................................... 15
5 Wiring Work ........................................................................................................... 16
5.1 Connection of Wire and Patch Board Terminal ................................................................ 16
5.2 Power Cord Connection .................................................................................................. 17
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or indoor unit)
.............................................................................................................................................. 17
5.4 Connect Communication Wire of Wired Controller .......................................................... 17
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network ......................... 18
6 Routine Maintenance ............................................................................................. 20
6.1 Cleaning of Filter ............................................................................................................. 20
6.2 Maintenance before the Seasonal Use ............................................................................ 20
6.3 Maintenance after the Seasonal Use ............................................................................... 20
7 Table of Error Codes for Indoor Unit ...................................................................... 21
8 Troubleshooting ..................................................................................................... 21

High ESP Fan Coil Indoor Unit
1
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.
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.
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 nitrigen 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.

High ESP Fan Coil Indoor Unit
2
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.
If anything abnormal
happens (such as burning
smell), please power off
the unit and cut off the
main power supply, and
then immerdiately 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.

High ESP Fan Coil Indoor Unit
3
2 Product Introduction
2.1 Names of Key Components
No. ① ② ③ ④ ⑤
Name Filter Air Inlet Air Outlet Fittings Drain Pipe
2.2 Rated Working Condition
Indoor Side Condition Outdoor Side Condition
Dry Bulb Temp℃(℉) Wet Bulb Temp℃(℉) Dry Bulb Temp℃(℉) Wet Bulb Temp℃(℉)
Rated Cooling 27(80.6) 19(66.2) 35(95) 24(75.2)
Rated Heating 20(68.0) 15(59.0) 7(44.6) 6(42.8)
Indoor Unit Working Temperature Range: 16°C~ 32°C.
2.3 Unit Functions
Unit Functions Wired Controller
Remote Controller
(Optional)
Operation Mode (Cooling,
Heating, Fan, Dehumidifying)
Fan Speed Adjustment
Temperature Adjustment
X-fan Function
Quiet Function
Sleep Function
Save Function
E-heater Function
Memory Function
Absence Function
Timer Function
Low Temp Dehumidify Function
Filter Cleaning Reminding
Function
I Feel
Light Function
Swing
VEWCL1B(Standard) VERCL1A

High ESP Fan Coil Indoor Unit
4
Note!
①√: included, X: not included
②Please refer to the user manual of Wired Controller or Remote Controller for function
details
3 Preparations for Installation
Note: Product graphics are only for reference. Please refer to actual products. Unspecified
measure unit is mm/inch.
3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No. Name Appearance Q'ty Usage
1 Wired Controller 1 To control the indoor unit
2
M4X25 Screw
(Cross recessed small
pan head screw)
3 To fix the wired controller
3 Drain Hose Assembly 1 To connect with the hard PVC
drain pipe
4 Special Nut 1 To be used for connecting the
refrigerant pipe
5 M10X8 Nut with Washer 4 To be used together with the
hanger bolt for installing the unit.
6 M10 Nut (M10X8.4 Nut) 4 To be used together with the
hanger bolt for installing the unit.
7 M10 Washer (Spring
Washer M10X2.6) 4 To be used together with the hanger bolt for installing the unit.
8 Insulation 1 To insulate the gas pipe
9 Insulation 1 To insulate the liquid pipe
10 Fastener 8 To fasten the sponge
11 Hanger or 4 To fix the indoor unit
12 Nut with Washer 8 To fix the hook on the cabinet of
the unit.
13 paper pattern for
installation 1 Locate the drill hole on ceiling

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

High ESP Fan Coil Indoor Unit
6
Fig 3.3.1
Wire type
Total length of
communication wire between
indoor unit and wired
controller (m/feet)
Wire diameter
(mm2/AWG) Wire standard Remark
Light/Ordinary
polyvinyl
chloride
sheathed
cord. (60227
IEC 52/60227
IEC 53)
L≤250(850) 2×0.75~2×1.25
(2×18~2×16)
IEC
60227-5:2007
1. Total length of
communication cable can't
exceed 250m (850feet).
2. The cord shall be Circular
cord (the cores shall be
twisted together).
3. If unit is installed in places
with intense magnetic field or
strong interference, it is
necessary to use shielded
wire.
3.3.2 Select communication line for indoor unit and outdoor unit
Fig 3.3.2
Wire type
Total length of
communication wire
between indoor unit and
indoor unit(outdoor unit)
(m/feet)
Wire diameter
(mm2/AWG) Wire standard Remark
(communicatio
n line for indoor
unit)
Light/Ordinary
polyvinyl
chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000(3280) L≤1000(3280) IEC 60227-5 1. If the wire diameter is
enlarged to 18AWG, the total
communication cable length
can reach 1500m (4920 feet).
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.
(communicatio
n line for
outdoor unit)
Light/Ordinary
polyvinyl
chloride
sheathed cord.
(60245 IEC 57)
L≤1000(3280) ≥2×0.75(2×18) IEC 60245-1

High ESP Fan Coil Indoor Unit
7
3.4 Wiring Requirements
(1) Power Cord Size and Air Switch Capacity
Model Power Cord Size
Air Switch
apacity
(A)
Minimum
Sectional Area of
Ground Wire
Minimum
Sectional Area of
Power
Cord(mm2)
220~240V-1ph-50
Hz
208~230V-1ph-60
Hz
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
(1) Use copper wire only as unit’s power cord. Operating temperature should be within its rated
value.
(2) If the power cord is more than 15 m (49-1/4 feet) long, please increase properly the sectional
area of power cord to avoid overload, which may cause accident.
(3) Above selection requirements: Power cord size is based on BV single-core wire (2~4pc) at 40°
(104°F) Cambient temperature when laying across plastic pipe. Air switch is D type and used at
40°C (104°F). If actual installation condition varies, please lower the capacity appropriately
according to the specifications of power cord and air switch provided by manufacturer.
(4) Install cut-off device near the unit. The minimum distance between each stage of cut-off device
should be 3 mm (1/8 inch) (The same for both indoor unit and outdoor unit).
VEHD019N432U
VEHD021N432U
VEHD024N432U
VEHD027N432U
VEHD031N432U
VEHD034N432U
VEHD038N432U
VEHD043N432U
VEHD048N432U
VEHD055N432U

High ESP Fan Coil Indoor Unit
8
4 Installation Instructions
4.1 Installation of Indoor Unit
4.1.1 Outline Dimension and Installation Spots
Equip with an inspection hatch after lifting the unit. For the convenience of maintenance, the
service port should be on one side of the electric box and below unit’s lower level.
(1) Below are the outline dimension applicable to indoor units whose cooling capacity range is
5.6kw to14.0kw.
Fig 4.1.1
(2) Below are the outline dimension applicable to indoor units whose cooling capacity is
16kw.
A
B
C
D
E
F
G
H
I
J
Fig 4.1.2

High ESP Fan Coil Indoor Unit
9
Below are dimensions of A, B, C, etc. for different models:
Unit: mm/inch
Model A B C D E F G H I J
1101
(43-3/8)
517
(20-3/8)
820
(32-1/4)
1159
(45-5/8)
1271
(50)
558
(22)
1002
(39-1/2)
160
(6-1/4)
235
(9-1/4)
268
(10-1/2)
1101
(43-3/8)
748
(29-1/2)
820
(32-1/4)
1115
(43-7/8)
1229
(48-3/8)
775
(30-1/2)
979
(38-1/2)
160
(6-1/4)
231
(9-1/8)
290
(11-3/8)
1177
(46-1/3)
646
(25-2/5)
852
(33-1/2)
1150
(45-1/5)
1340
(52-4/5)
750
(29-1/2)
953
(37-1/2)
190
(7-1/2)
316
(12-2/5)
350
(13-4/5)
(2) Drill bolt holes and install bolts
1) Stick the reference cardboard on the installation position; drill 4 holes according to the
hole site on the cardboard as shown in fig 4.1.3; diameter of drilling hole is according to
the diameter of expansion bolt and the depth is 60-70mm(2-3/8~2-3/4 inch), as shown
in fig 4.1.4.
Fig 4.1.3 Fig 4.1.4
2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as
shown in fig 4.1.5.
Note:
The length of bolt depends on the installation height of the unit, bolts are field supplied.
Fig 4.1.5
(3) Install the indoor unit temporarily
Assemble suspension bolt on the expansion bolt, attach the hanger bracket to the suspension
VEHD019N432U
VEHD021N432U
VEHD024N432U
VEHD027N432U
VEHD031N432U
VEHD034N432U
VEHD038N432U
VEHD043N432U
VEHD048N432U
VEHD055N432U

High ESP Fan Coil Indoor Unit
10
bolt. Be sure to fix it securely by using a nut and washer from upper and lower sides of the hanger
bracket. The washer fixing plate will prevent the washer from falling.
(4) The usage of paper pattern
Refer to paper pattern of installation for ceiling opening dimension. The center of ceiling
opening is indicated on the paper pattern. Fix the paper pattern to the unit with 4 screws and fix
the corners of the waterspout at the drainage pipe by screws.
(5) Adjust the unit to the right position.
(6) Check the level of the unit
The indoor unit is equipped with build-in water pump and float switch, verify the levelness of 4
directions by level gauge or vinyl tube (filled with water) respectively.
Fig 4.1.6
(7) Remove the washer locating plate and then tighten the nut on it.
(8) Remove the paper pattern.
Fig 4.1.7
4.2 Refrigerant Pipe Connection
(1) Aim the flaring port of copper pipe at the center of screwed joint and then tighten the
flaring nut with hand as shown in fig 4.2.
(2) Tighten the flaring nut with torque wrench.
Torque for tightening nut
Fig.4.2
Pipe diameter
mm(inch) Torque (N·m)
9.52(3/8) 35-40
15.9(5/8) 60-65
19.04(3/4) 70-75

High ESP Fan Coil Indoor Unit
11
(3) Use pipe bend when bending the pipe and the bending angle should not be too small.
(4) Wrap the connection pipe and joint with sponge and then tie them firmly with tape.
4.3 Drainage Pipe Installation and Drainage System Testing
4.3.1 Notice for Installation of Drain Pipe
(1) The drainage pipe should be short and the gradient downwards should be at least
1%~2% in order to drain condensation water smoothly.
(2) The diameter of drainage hose should be bigger or equal to the diameter of drainage
pipe joint.
(3) Install drainage pipe according to the following fig and arrange insulation to the drainage
pipe. Improper installation may lead to water leakage and damp the furniture and other
things in the room.
(4) You can buy normal hard PVC pipe used as the drainage pipe. During connection, insert
the end of PVC pipe into the drainage hole and then tighten it with drainage hole and
wire binder. Can’t connect the drainage hole and drainage hole with glue.
(5) When the drainage pipelines are used for several units, the position of pipeline should
be about 100mm (4 inch) lower than the drainage port of each unit. In this case, thicker
pipes should be applied.
Fig 4.3.1
4.3.2 Drainage pipe installation
(1) Insert the drain hose into the drain hole and tighten it with tapes, as shown in Fig 4.3.2.
(2) Tighten the pipe clamp, with the distance between screw nut and hose smaller than
4mm (1/8inch).
①metal clamp(accessory)
②drain hose(accessory)
(3) Use sealing plate to make the pipe clamp and hose insulated, as shown in Fig.4.3.3.
①metal clamp(accessory)
②thermal sponge(accessory)
Fig 4.3.2 Fig 4.3.3
(4) When connecting several drain pipes, follow the instruction as indicated in Fig 4.3.4.
Choose the drain collecting pipe that matches with unit capacity.

High ESP Fan Coil Indoor Unit
12
Fig 4.3.4
(5) Install the trap as shown in following 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.
Fig 4.3.5
(8) The horizontal pipe can be connected to vertical pipe in the same level; please select
the connection way as shown in following fig.
NO1: Connection of drainage pipe joints (Fig4.3.6)
NO2: Connection of downspout elbow (Fig4.3.7)
NO3: Inserting pipe connection (Fig4.3.8)
Fig 4.3.6 Fig 4.3.7 Fig 4.3.8
(9) The installation height of raising pipe for drainage should be lower than 850 mm
(31-1/2inch). The gradient from raising pipe towards drainage direction should be at
least 1%~2%. If the raising pipe is vertical with the unit, the raising height should be less
than 800 mm (35-3/8inch).
Fig 4.3.9
(10) Drain pipes should have a downward slope of at least 1%~2%, in order to prevent pipes
from sagging, install hanger bracket at intervals of 1000~1500 mm (39-3/8~59 inch).

High ESP Fan Coil Indoor Unit
13
Fig 4.3.10
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is finished.
1) Inject approximately 1L purified water to drain pan from air vent, ensure that not to
splash the water over the electrical components (e.g. water pump. etc).
2) In case of commissioning finished, please energize the IDUs and switch to cooling or
dry mode, meanwhile, the water pump operates, you can check the draining through
the drain socket.
3) If communication wire is not connected, communication malfunction “C0” will occur
after 60s of energizing. In this case, the water pump operates automatically. Check if
the water pump drains normally through drainage port. The water pump will stop
automatically after running for 10mins.
(2) During the test, please carefully check the drainage joint, make sure no any leakage
occur.
(3) It’s strongly recommend to do the drain test before ceiling decoration.
Fig 4.3.11
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(5-7/8 inch) away from
the wall. Add a filter 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.).
4.4.1 Installation of Air-out Duct

High ESP Fan Coil Indoor Unit
14
(1) Installation of the Rectangular Duct
Fig 4.4.1
No. Name No. Name
1 Hanger Rod 5 Static Pressure Box
2 Return Air Duct 6 Main Supply Air Duct
3 Canvas Duct 7 Supply Air Outlet
4 Return Air Inlet
4.4.2 Shape and Size of Air Outlet and Air-return Opening
Fig 4.4.2 Air Outlet
Fig 4.4.3 Air-return Opening
Model Size of Air Outlet Size of Air –returen Opening
A B C D
VEHD019N432U
VEHD021N432U
VEHD024N432U
VEHD027N432U
VEHD031N432U
VEHD034N432U
VEHD038N432U
VEHD043N432U
VEHD048N432U
158
(6-1/4) 818 (32-1/4) 994
(39-1/8) 195 (7-5/8)
158
(6-1/4) 818 (32-1/4) 100
(3-7/8) 206 (8-1/8)
190
(7-1/2)
850
(33-1/2)
940
(37)
286
(11-1/4)
VEHD055N432U

High ESP Fan Coil Indoor Unit
15
4.4.3 Installation of the Return Air Duct
(1) The default installation location of the rectangular flange is at the back and the return air
cover plate is at the bottom, as shown in Fig 4.4.4.
Fig 4.4.4
(2) The installation method can be choosen with considering the conditions of the building
and maintenance etc., as shown in Fig 4.4.5.
Fig 4.4.5
Table 5 Installation of the return air duct
No.
Name
No.
Name
1
Return Air Inlet (with filter)
4
Supply Air Duct
2
Return Air Duct
5
Grille
3
Indoor unit
4.5 Installation of Wired Controller
Please refer to User Manual of Wired Controller for the installation details.
NOTICE! 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.