Lennox VESD007N432U User manual

VESD007N432U
VESD008N432U
VESD009N432U
VESD011N432U
VESD012N432U
VESD013N432U
VESD015N432U
VESD017N432U
VESD019N432U
VESD021N432U
VESD024N432U
VRF Iutdoor Units
Installation Manual
Slim Fan Coil
Thank you for selecting LENNOX air conditioners. Please read this manual carefully before operation
and keep it for further reference.
Ducted

Preface
For correct installation and operation, please read all instructions carefully. Before reading the
instructions, please be aware of the following items:
1) Execution standard of VRF: ISO 15042-2011.
2) For the safe operation of this unit, please read and follow the instructions carefully.
3) During operation, total capacity of indoor units should not exceed the total capacity of
outdoor units. Otherwise, indoor units will not provide enough cooling or heating.
4) Direct operators or maintainers should well keep this manual.
5) If this unit fails to operate normally, please contact our service center as soon as possible
and provide the following information:
◆Content on the nameplate (model number, cooling capacity, production code, ex-factory
date).
◆Malfunction details (before and after the malfunction occurs).
6) Each unit has been strictly tested and proved to be qualified before ex-factory. In order to
prevent units from being damaged or operating 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.
7) All graphics in this manual are only for your reference. For sales or production reasons,
these graphics are subject to change by manufacturer without prior notice.
8) 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.
9) 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.
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.........................................................................................................3
3.1 Standard Fittings................................................................................................................3
3.2 Location for Installation......................................................................................................4
3.3 Requirements for Communication Line .............................................................................5
3.4 Wiring Requirements.........................................................................................................5
4 Installation Instructions................................................................................................................6
4.1 Installation of Indoor Unit...................................................................................................6
4.2 Pipe Connection................................................................................................................9
4.3 Installation and Test of Drain Pipe.....................................................................................9
4.4 Installation ofAir Duct......................................................................................................12
4.5 Installation of Wired Controller.........................................................................................15
5 Wire Connection...................................................................................................................... 15
5.1 Connection of Wire and Wiring Board Terminal...............................................................15
5.2 Power Cord Connection ..................................................................................................16
5.3 Connection of Communication Line of IDU and ODU......................................................17
5.4 Connection of Communication Line of Wired Controller..................................................17
5.5 Instructions on Connecting Wired Controller and IDU Network.......................................18
6 General Maintenance ................................................................................................................20
6.1 Cleaning of Air Filter........................................................................................................20
6.2 Maintenance Before Use-season ....................................................................................20
6.3 Maintenance After Use-season .......................................................................................20
7 Malfunction Codes of IDU..........................................................................................................20
8 Troubleshooting.........................................................................................................................21

Slim 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.
Frefrigerant 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.

Slim Fan Coil Indoor Unit
2
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.
I f 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.

Slim Fan Coil Indoor Unit
3
2 Product Introduction
2.1 Names of Key Components
NO. ①②③④⑤
Name Drain Pipe Electric box Hooker Air Outlet Air-return Opening
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 27 19 35 24
Rated Heating 20 15 7 6
2.3 Unit Functions
Unit Functions Wired Controller VEWCL1B
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 ｘ
Light Function √
Swing √
Notes:
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.
3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.

Slim Fan Coil Indoor Unit
4
No. Name Graphics Quantity Purpose
1 wire controller package (including wire
controller, emergency bottom case,
instruction manual, screws, packing box) 1set Control indoor unit
2 Remote controller 0 or 1 optional parts (including
#7 batteries)
3 Sponge for drainage pipe 2 wrap water pipe and
rubber cork for
condenser
4 Insulating materials 2 used for the joint of gas
pipe and liquid pipe for
indoor unit
5 Corrugated pipe 0 or 1 Diameter of air
pipe≥15.9
6 Union nut 1 or 2 one for the model with
corrugated pipe; two for
other models
7 Spring washer M8, nut M8, nut with
washer M8, washer M8 4 Used for hanging the
indoor unit
8 Tieline 6 Wrap the sponge at the
connection position
9 others
User Manual: 1 copy
Loosen-leaf of Instruction Manual : 1 copy (harmful substance content table)
Qualified Certificate: 1 copy
Bar Code : 1 copy
3.2 Location for Installation
1) The top holder must be strong enough to support unit's weight.
2) Drain pipe can drain water out easily.
3) There is no obstacle at inlet or outlet. Please ensure good air circulation.
4) In order to make sure the space for maintenance, please install the indoor unit according to the
dimension described below.
5) Keep the unit away from heating source, inflammable gas or smoke.
6) This is a concealed ceiling type unit.
7) Indoor unit, outdoor unit, power cord and electric wire should stay at least 1m from the TV set and
radio. Otherwise, these electrical appliances may have image interference and noise. (Even if the
distance is 1m, when there is strong electric wave, noise may still occur.)
8) The appliance shall not be installed in the laundry. Unit: mm
Fig 3.1

Slim Fan Coil Indoor Unit
5
Notes:
①Installation of the unit must be in accordance with National Electric Codes and local 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
Notes:
If the unit is installed in the place with strong electromagnetic interference, shielded wire must be
applied on the communication wire between indoor unit and wired controller. Twisted pair line with
shielding function must be applied on the communication wire between indoor unit and indoor unit
(outdoor unit).
3.3.1 Select communication line for indoor unit and wired controller
Fig 3.3.1
Material type
Total length of
communication line
between indoor unit and
wired controller L (m/feet)
Wire size
(mm2/AWG) Material Standard Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤250m
(L≤820-1/5feet)
2×0.75~2×1
.25
(2×AWG18~
2×AWG16)
IEC
60227-5:
2007
1.Total length of communication line can't
exceed 250m (820-1/5feet).
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
Material Type
Total Length L (m/feet)
of Communication
Cable between Indoor
Unit and Indoor
(Outdoor) Unit
Wire size
(mm2/AWG) Material Standard Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord. (60227
IEC 52
/60227 IEC 53)
L≤1000m
(L≤3280-5/6feet) ≥2×0.75 (≥2×AWG18) IEC
60227-5:2007
1. If the wire diameter is enlarged to
2×1 mm2(2×AWG16), the total
communication line length can
reach 1500 m (4921-1/4feet).
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.

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3.4 Wiring Requirements
（1）
Power Cord Size and Air Switch Capacity
Model Power Supply Air Switch
Capacity(A) Minimum Sectional Area
of Ground Wire(mm2)Minimum Sectional Area of Power Cord(mm2)
220~240V-1Ph-50Hz
208~230V-1Ph-60Hz
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
6 1.0 1.0
Notes:
①Use copper wire only as unit's power cord. Operating temperature should be within its rated value.
②If the power cord is more than 15m long, please increase properly the sectional area of power cord to
avoid accident due to overload.
③Above selection requirements: Power cord size is based on BV single-core wire (2~4pc) at 40°C
ambient temperature when laying across plastic pipe. Air switch is D type and used at 40°C. If actual
installation condition varies, please lower the capacity appropriately according to the specifications of power
cord and air switch provided by manufacturer.
2
Install cut-off device near the unit. The minimum distance between each stage of cut-off device
should be 3mm (The same for both indoor unit and outdoor unit).
3
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.
4 Installation Instructions
4.1 Installation of Indoor Unit
4.1.1 Outline Dimension and Installation Spots
Equip with a service port 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.
Below are the outline dimension applicable to indoor units of VESD007N432U
、VESD008N432U、VESD009N432U、VESD011N432U、VESD012N432U、VESD013N432U、
VESD015N432U、VESD017N432U、VESD019N432U、VESD021N432U、VESD024N432U.
.
VESD007N432U
VESD008N432U
VESD009N432U
VESD011N432U
VESD012N432U
VESD013N432U
VESD015N432U
VESD017N432U
VESD019N432U
VESD021N432U
VESD024N432U

Slim Fan Coil Indoor Unit
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Fig 4.1.1
Below are dimensions of A, B, C, etc. for different models: Unit: mm
Item
Model A B C D E F
VESD007N432U~VESD012N432U 760 415 700 200 450 474
VESD013N432U~VESD021N432U 1060 415 1000 200 450 474
VESD024N432U 1360 415 1300 200 450 474
4.1.2 Punching of Bolt Spots and Bolt Installation
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 4.1.2.
Fig 4.1.2
Insert the expansion bolt M10 into the hole and then drive the iron nail into the bolt, as shown in Fig 4.1.3.

Slim Fan Coil Indoor Unit
8
Fig 4.1.3
Notes:
The length of bolt depends on the installation height of the unit, bolts are field supplied.
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 4.1.4
Notes:
①Before installation, please finish the preparation work of all pipes (connection pipe, drain pipe) and
wires (wired controller wire, connection wire of IDU and ODU) that need to be connected with the indoor unit.
②Punch holes on the ceiling (air return opening or air inlet). Ceiling may have to be strengthened to make
it level and to prevent it from vibration. You may consult user or constructor for details.
③If the ceiling is not strong enough, you can install a beam bracket in a corner and secure the unit on the
beam.
4.1.4 Horizontal Alignment
After the indoor unit is installed, remember to check the horizontal status of the whole unit. It should be
horizontal from front to back and slant 1% from left to right, following the drainage direction, as shown in
Fig.4.1.5.

Slim Fan Coil Indoor Unit
9
Fig 4.1.5
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
Fig.4.2
（3）
The pipe should not be bent too much or it may crack. Use a pipe bender when bending the pipe.
（4）
Use a sponge to wrap the uninsulated connection pipe and the joint. Then tie it tight with a plastic
tape.
4.3 Installation and Test of Drain Pipe
4.3.1 Notice for Installation of Drain Pipe
（1）
The drain pipe should be as short as possible and slope downward for at least 1%~2% so that
condensate can drain out easily.
（2）
Size of the drainage hose must not be smaller than that of the drain pipe.
（3）
Install the drain pipe according to the following diagram and make it insulated. Improper installation
will lead to water leakage and furniture and other objects may get wet.
（4）
You can buy local hard PVC pipe as drain pipe. When connecting the pipe, insert the end of PVC
pipe into the drain hole and then tighten it up with a drain hose and cable tie. Do not use adhesives
to connect drain hole and drain hose.
（5）
When the drain pipe is used for several equipment, 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 Installation of Drain Pipe
Pipe diameter (mm) Torque (N·m)
φ6.35 15~30
φ9.52 35~40
Φ12.7 45~50
φ15.9 60~65

Slim Fan Coil Indoor Unit
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（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.
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.
Fig 4.3.4
5
(5)For indoor units that have high pressure at the outlet of drain pipe, use water-sealed joint.
6
For indoor units that have high pressure at the outlet of drain pipe, use water-sealed joint.
7
Install the water-sealed joint according to Fig.4.3.5.
8
Each unit should be installed with one water-sealed joint.
Fig 4.3.5
9
The horizontal pipe can be connected to vertical pipe in the same level; please select the
connection way as shown in following fig.

Slim Fan Coil Indoor Unit
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Fig 4.3.6 Fig 4.3.7 Fig 4.3.8
NO1: Connection of drainage pipe joints (Fig4.3.6)
NO2: Connection of downspout elbow (Fig4.3.7)
NO3: Inserting pipe connection (Fig4.3.8)
10
The installation height of raising pipe for drainage should be lower than 850mm. 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 800mm.
Fig 4.3.9
11
Drain pipes should have a downward slope of at least 1%~2%, in order to prevent pipes from
sagging, install hanger bracket at intervals of 1000~1500mm.
Fig 4.3.10
4.3.3 Test of Drainage System
Models without water pump
1
Fill some water to the water tray of indoor unit as following.
1) Connect the drain hose to the other drain connection pipe of water tray and fill about 1L water (as
shown in 4.3.11). (Remove the drain hose after finishing testing and then put on the plug of water
tray.)
2) Spray 1L water on evaporator with sprayer, as shown in 4.3.12.
Fig.4.3.11 Fig.4.3.12
2 Check if the water drains smoothly from the drain pipe and check if there is water leakage on the

Slim Fan Coil Indoor Unit
12
connection pipe.
3
Arrange insulation of drain hose and pipe clamp after checking the drain system.
Models with water pump
4
Fill some water to the water tray of indoor unit as following.
1) Connect the drain hose to the other drain connection pipe of water tray and fill about 1L water (as
shown in 4.3.11). (Remove the drain hose after finishing testing and then put on the plug of water
tray.)
2) Spray 1L water on evaporator with sprayer, as shown in 4.3.12.
1 Start the water to check if water drain smoothly. The starting method of water pump is as below.
1) If project debugging of unit has been done, please set the indoor unit in cooling or dry mode. In this
case, the water pump will operate automatically.
2) If electrical wiring of unit hasn’t been done, please open the electric box cover. Connect one phase
power cord at L1, N or L, N of wiring board; About 60s after connecting power supply, indoor unit will
report “C0” communication malfunction. In this case, the water pump will automatically operate for
10min and then stop; After checking the drain system, please cut off power supply, disconnect
power cord and then put on the electric box cover.
2
Check if the water drains smoothly from the drain pipe and check if there is water leakage on the
connection pipe.
3
Arrange insulation of drain hose and pipe clamp after checking the drain system.
4.4 Installation of Air Duct
Notes:
①There should be insulation layer on air-out duct, air-return duct and fresh air duct to avoid heat loss and
moisture. Adhere a nail on the air duct and then add thermal sponge with a layer of tin. Fasten it with a nail
cover and then seal the junction with tin tapes; You can also use other materials that have good insulation
quality.
②Each air-out duct and air-return duct should be fixed on a pre-made board with iron frame. The junction
of air duct should be well-sealed in order to prevent air leakage.
③The design and construction of air duct should comply with national requirements.
④The edge of air-return duct is suggested to be more than 150mm away from the wall. Add a filter to the
air-return opening.
⑤Please consider noise-damping and vibration damping for the design and construction of air duct.
Besides, noise source must be away from people. For instance, do not have the air-return opening installed on
top of the user(offices, rest area, etc.).
4.4.1 Installation of Air-out Duct
1
Installation of Rectangular Duct

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Fig 4.4.1
No. Name No. Name
1 Hanger Rod 5 Static Pressure Box
2 Return Air Duct 6 Filter Screen
3 Canvas Duct 7 Main Supply Air Duct
4 Return Air Inlet 8 Supply Air Outlet
1
Installation of Circular Duct
Fig 4.4.2
No. Name No. Name
1 Return Air Duct 6 Transition Pipe
2 Canvas Duct 7 Supply Air Duct
3 Return 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
The following figure is applicable for the models below: VESD007N432U
VESD008N432U、VESD009N432U、VESD011N432U、VESD012N432U、VESD013N432U、
VESD015N432U、VESD017N432U、VESD019N432U、VESD021N432U、VESD024N432U.
Fig 4.4.3
Item
Model
Dimension of air outlet flange Dimension of air return
A B C D
~VESD012N432U 122 585 200 700
VESD007N432U

Slim Fan Coil Indoor Unit
14
VESD013N432U ~VESD021N432U 122 885 200 1000
VESD024N432U 122 1185 200 1300
4.4.3 Installation of Air-return Duct
1
Square flange is defaulted to be fitted on the back before ex-factory. Air-return cover is on the
bottom, as shown in Fig.4.4.4.
Fig 4.4.4
2
If air return from the bottom is needed, switch the positions of square flange and air-return cover.
3
Use a clincher to connect air-return duct to the air-return opening of indoor unit. The other end of
air-return duct connects with the air-return louver. In order to adjust the height conveniently, you
can make a folded canvas duct and have it strengthened by 8# iron wire.
4
Air return from the bottom will produce more noise than air return from the back. So we suggest you
to add a noise damper and static pressure case to lower noise if you choose air return from the
bottom.
5
Select the appropriate installation way based on actual construction and maintenance needs, as
shown in Fig.4.4.5.
Fig 4.4.5
No. Name No. Name
1 Return Air Inlet (with filter) 4 Indoor unit
2 Canvas Duct 5 Supply Air Duct
3 Return Air Duct 6 Grille
4.4.4 Installation of Fresh Air Duct
1
If a fresh air duct is needed, remove the fresh air baffle as shown in Fig.4.4.6. If a fresh air duct is
not needed, block the gap on the baffle with sponge.
2 Install circular flange so that fresh air duct can be easily connected, as shown in Fig.4.4.7.
3 Both air duct and circular flange need to be well-sealed and insulated.
4 Fresh air should be the air that has been filtered.