Lennox VE2C009N432U User manual

VE2C009N432U
VE2C012N432U
VE2C015N432U
VE2C017N432U
VE2C019N432U
VE2C021N432U
VE2C024N432U
Thank you for selecting LENNOX air conditioners. Please read this manual carefully before operation
and keep it for further reference.
VRF Indoor Units
Installation Manual
:D\&DVVHWWH

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 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
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.
 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 Notices (Please be sure to abide)............................................................. 1
2 Product Introduction ............................................................................................. 4
2.1 Names of Key Components ......................................................................................... 4
2.2 Rated Working Condition ............................................................................................. 4
3 Preparations for Installation................................................................................. 4
3.1 Standard Fittings .......................................................................................................... 4
3.2 Installation Position Selection ....................................................................................... 5
3.3 Requirements of Communication Wire Selection ......................................................... 6
3.4 Wiring Requirements .................................................................................................... 7
4 Installation Instructions ........................................................................................ 8
4.1 Indoor Unit Installation ................................................................................................. 8
4.2 Refrigerant Pipe Connection ....................................................................................... 11
4.3 Drainage Pipe Installation and Drainage System Testing ............................................ 11
4.4 Panel Installation .........................................................................................................15
4.5 Installation of Wired Controller ....................................................................................16
5 Wiring Work ......................................................................................................... 17
5.1 Connection of Wire and Patch Board Terminal ............................................................17
5.2 Power Cord Connection ..............................................................................................18
5.3 Connection of Communication Wire Between Indoor Unit and Outdoor Unit (or indoor
unit) ...................................................................................................................................19
5.4 Connection of Communication Wire for Wired Controller.............................................19
5.5 Wiring Instructions of Wired Controller and Indoor Units Network ...............................20
6 Routine Maintenance........................................................................................... 22
6.1 Cleaning of Filter .........................................................................................................22
6.2 Maintenance Before The Seasonal Use ......................................................................22
6.3 Maintenance After The Seasonal Use .........................................................................22
7 Table of Error Codes for Indoor Unit.................................................................. 23
8 Display of Light Board ........................................................................................ 24
9 Troubleshooting .................................................................................................. 25

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
1
1 Safety Notices (Please be sure to abide)
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.

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
2
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.
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.

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
3
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.
LENNOX will not assume responsibility of personal injury or equipment damage caused by
improper installation and commission, unnecessary service and incapable of following the rules
and instructions listed in this manual.
DISPOSAL: Donot dispose this product as unsorted municipal waste. Collection of such
waste separately for special treatment is necessary.

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
4
2 Product Introduction
2.1 Names of Key Components
①②
③
④⑤⑥⑦
No.
①
②
③
④
⑤
⑥
⑦
Name
Drainage
Pipe
Connection
Pipe
Drainage
Device
Air Inlet Grille (With Filter)
Main Unit
Louver
Panel
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
3 Preparations for Installation
NOTE: this picture is for reference only, please refer to the actual product, the unit of
dimension is mm.
3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No.
Name
Appearance
Q'ty
Usage
1
Drainage hose assembly
1
To connect the drainage pipe
2
Insulation
1
To insulate the gas pipe
3
Insulation
1
To insulate the liquid pipe
4
Sponge
1
To insulate the drain pipe

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
5
No.
Name
Appearance
Q'ty
Usage
5
Special Nut
2
VE2C009~017N432U
1
VE2C019~024N432U
6
Corrugated pipe
1
7
Fastener
4
To fasten the sponge
8
Paper pattern for installation
天花板开口 长度1400mm
吊装螺杆间 距261mm
吊装螺杆间 距1252mm
主体宽度520mm
天花板开口宽度550mm
主体长度1 198mm
为了您正确 安装和使用 安装用纸板 ，请在安 装前仔细
阅读《使用 安装说明书 》中的相关 内容！
安装和使用 安装用纸板 必须由专 业人士进行 操作！
注意事项：
安装用纸板
1
Locate the drill hole on ceiling
9
Tapping screw with washer
4
Fix paper pattern
10
Remote controller
1+2
To control the indoor unit
11
M10 Washer
10
To be used together with the
hanger bolt for installing the unit.
12
Washer fixing plate
4
Prevent the washer from falling off
3.2 Installation Position Selection
(1) The location should be able to withstand the weight of unit.
(2) The water can be drained conveniently from drainage pipe.
(3) There should be no obstruction near air inlet and air outlet.
(4) Follow the installation distance required in the fig below to ensure sufficient space for
maintenance.
(5) The installation location should be far from heat sources, flammable or explosive gas, or
smog spread in the air.
(6) The appliance shall not be installed in the laundry.
VE2C019~024N432U

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
6
(7) The indoor unit, outdoor unit, power cord and connection electricity wire should be at
least 1m from television and radio in order to prevent interference and noise (Even
though 1m distance is ensured, there may be noise if the electric wave is too strong) .
Unit: mm
Fig 3.2.1
NOTE:
① The unit shall be installed in accordance with national standards or local regulations.
② Only qualified personnel can carry out installation work, please contact with local dealer
before installation.
③ Make sure all the installation work completed before energizing.
3.3 Requirements of Communication Wire Selection
NOTE: If air conditioner used under strong electronic-magnetic interference circumstance,
STP (shielded twisted pair) communication cable must be adopted.
3.3.1 Selection of communication wire between indoor unit and wired controller
Fig 3.3.1

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
7
Wire type
Total length of
communication wire
between indoor unit and
wired controller (m)
Wire diameter
(mm2)
Wire standard
Remark
Light/Ordinary
polyvinyl chloride
sheathed
cord(60227 IEC 52
/60227 IEC 53).
L≤250
2×0.75~2×1.25
IEC
60227-5:2007
Total length of communication
cable can't exceed 250m.
The cord shall be Circular cord
(the cores shall be twisted
together).
If unit is installed in places with
intense magnetic field or
strong interference, it is
necessary to use shielded
wire.
3.3.2 Selection of Communication Wire Between Indoor Unit and Indoor Unit (or
outdoor unit)
Fig 3.3.2
Wire type
Total length of
communication wire
between indoor unit and
indoor unit(outdoor unit)
(m)
Wire diameter
(mm2)
Wire standard
Remark
Light/Ordinary
polyvinyl chloride
sheathed cord
(60227 IEC 52
/60227 IEC 53)
(60227 IEC 52
/60227 IEC 53).
L≤1000
≥2×0.75
IIEC
60227-5:2007
If the wire diameter is enlarged
to 2 × 1 mm2, the total
communication cable length
can reach 1500m.
The cord shall be Circular cord
(the cores shall be twisted
together).
If unit is installed in places with
intense magnetic field or strong
interference, it is necessary to
use shielded wire.
3.4 Wiring Requirements
Dimension of power cord and capacity of air switch.
NOTE:
① The circuit breaker and power cord specification in above sheet are based on max power
(max current) of the unit.
② The power cord specification in above sheet is based on ambient temperature of 40°C.

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
8
③ The circuit breaker specification in above sheet is based on ambient temperature of
40°C.
④ If the working condition is different, please adjust it according to the specification sheet of
circuit breaker.
Model
Power Supply
Air Switch
Capacity (A)
Minimum
Sectional Area of
Grounding
Wire(mm2)
Minimum
Sectional Area
of Power Cord
(mm2)
VE2C009N432U
220~240V-1ph-50Hz
208~230V-1ph-60Hz
6
1
1
VE2C012N432U
6
1
1
VE2C015N432U
6
1
1
VE2C017N432U
6
1
1
VE2C019N432U
6
1
1
VE2C021N432U
6
1
1
VE2C024N432U
6
1
1
4 Installation Instructions
4.1 Indoor Unit Installation
4.1.1 Ceiling Opening Dimension and Suspension Bolt Position
Unit: mm
Fig 4.1.1
Unit: mm

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
9
Model
Indoor
unit(A)
Suspension bolt
pitch(B)
Ceiling
opening(C)
Decoration
panel(D)
Outer diameter of
connection pipe(mm)
Liquid pipe
Gas pipe
VE2C009N432U
1200
1252
1386
1416
6.35
9.52
VE2C012N432U
VE2C015N432U
VE2C017N432U
1200
1252
1386
1416
6.35
12.7
VE2C019N432U
VE2C021N432U
VE2C024N432U
1200
1252
1386
1416
9.52
15.9
IMPORTANT: The drilling work must be carried out by qualified personnel.
4.1.2 Suspend The Indoor Unit
(1) Drill bolt holes and install bolts.
1) Stick the paper pattern on the installation position; drill 4 holes according to the hole
site on the cardboard as shown in fig 4.1.2; diameter of drilling hole is according to the
diameter of expansion bolt and the depth is 60-70mm, as shown in fig 4.1.3.
Fig 4.1.2 Fig 4.1.3
2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as
shown in fig 4.1.4.
NOTE: The length of bolt depends on the installation height of the unit, bolts are field
supplied.
Fig 4.1.4

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
10
(2) Install the indoor unit temporarily.
Assemble suspension bolt on the expansion bolt, attach the hanger bracket to the
suspension 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.
(3) 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.
(4) Adjust the unit to the right position.
(5) 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.
(6) Remove the washer locating plate and then tighten the nut on it.
(7) Remove the paper pattern.
Fig 4.1.5

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
11
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) Use a torque wrench to tighten up the flaring nut until the wrench gives out a click sound.
Fig.4.2
Torque for tightening nut
Pipe diameter (mm)
Torque (N·m)
Φ6.35
15~30
Φ9.52
35~40
Φ12.7
45~50
Φ15.9
60~65
(3) The pipe should not be bent too much or it may crack. Use a pipe bender when bending
the pipe.
(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 Drainage 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 drainage pipe should be short and the gradient downwards should be at least 1%~2%
in order to drain condensation water smoothly.
(5) The diameter of drainage hose should be bigger or equal to the diameter of drainage pipe
joint.
(6) 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.

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
12
(7) 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. Never connect the drainage hole and drainage hose with glue.
(8) 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 Installation of Drainage Pipe
(1) Drainage pipe should have the same diameter or larger diameter than the connection
pipes (PVC pipe, outside diameter 25mm, thickness≥1.5mm).
(2) Keep drainage pipe short and sloping downwards at a gradient of at least 1% for
preventing forming air bubbles.
(3) If the gradient of drainage pipe could not meet the installation requirements, raising pipe
should be applied.
(4) Insert the drainage hose into drain socket and then tighten the metal clamp securely.
(5) Warp the sealing pad over drainage hose and metal clamp for heat insulation.
(6) Make sure to perform insulation work for all drainage hoses in the room in order to
prevent any possible water dropping due to dew condensation.
(7) Apply the suitable diameter for converging drainage pipe according to the operating
capacity of the unit, as show in Fig. 4.3.2.
Fig 4.3.2
①-Drainage pipes assembled by T-shaped joints.

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
13
(8) The horizontal pipe can’t be connected to vertical pipe in the same level; please select
the connection way as shown in following fig.
NO.1: Three-way connection of drainage pipe joints (Fig 4.3.3).
NO.2: Connection of downspout elbow (Fig 4.3.4).
NO.3: Inserting horizontal pipe connection (Fig 4.3.5).
Fig 4.3.3 Fig 4.3.4 Fig 4.3.5
(9) Drainage 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 4.3.4
(10) The installation height of raising pipe for drainage should be lower than B. 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 C, as shown in Fig 4.3.5.
Fig 4.3.5
model
A(mm)
B(mm)
C(mm)
VE2C009N432U
VE2C012N432U
VE2C015N432U
VE2C017N432U
VE2C019N432U
VE2C021N432U
VE2C024N432U
260
740
690

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
14
(11) During the installation, distance from soft drain pipe to the gasket is C mm when the bolt
is tightened. It is not allowed to apply PVC or other related glue in the joints of two ends
of drain pipe.
Fig 4.3.6
Model
C(mm)
VE2C009~024N432U
10±3
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).
1) 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.
2) If communication wire is not connected, communication malfunction “C0” will occur
after 60s of energizing. In this case, the water pump operates automatically. Check if
the water pump drains normally 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 4.3.7

Multi Variable Air Conditioners Two-way Cassette Type Indoor Unit
15
4.4 Panel Installation
4.4.1 Notices for Installation
(1) Improper decorative panel installation could cause the following problems.
Fig 4.4.1
(2) Ensure that it’s clearance-free between decoration panel and ceiling board after
installation, if not, please adjust the body position.
Fig 4.4.2
(3) Connect the decoration panel terminals (Female) to body terminals (male) as shown in
figure4.4.3.
Fig 4.4.3