Lennox VRF VELD024N432U Installation instructions

VELD007N432U
VELD008N432U
VELD009N432U
VELD011N432U
VELD012N432U
VELD013N432U
VELD015N432U
VELD018N432U
VELD019N432U
VELD021N432U
Thank you for selecting
INSTALLATION/OPERATION
INSTRUCTIONS
VELow ESP Fan Coil
VRF SYSTEMS
INDOOR UNITS
©2016 Lennox Industries Inc.
Dallas, Texas, USA
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
VELD024N432U
VELD027N432U
VELD031N432U
VELD034N432U
VELD038N432U
VELD042N432U
VELD048N432U

Preface
For correct installation and operation, please read all instructions carefully. Before
reading the instructions, please be aware of the following items:
(1)For the safe operation of this unit, please read and follow the instructions carefully.
(2)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.
(3)Direct operators or maintainers should well keep this manual.
(4)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).
(5)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.
(6)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.
(7)All graphics in this manual is only for your reference. For sales or production reasons,
these graphics are subject to change by manufacturer without prior notice.
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.
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 .........................................................................4
2.1 Names of Key Components .......................................................4
2.2 Rated Working Condition ..........................................................4
2.3 Unit Functions ...........................................................................4
3 Preparations for Installation..............................................................5
3.1 Standard Fittings .......................................................................5
3.2 Location for Installation.............................................................6
3.3 Requirements for Communication Line.....................................6
3.4 Wiring Requirements ................................................................8
4 Installation Instructions.....................................................................9
4.1 Installation of Indoor Unit .........................................................9
4.2 Refrigerant Pipe Connection ...................................................12
4.3 Drainage Pipe Installation and Drainage System Testing.........12
4.4 Installation of Air Duct.............................................................15
4.5 Installation of Wired Controller...............................................18
5 Wiring Work ....................................................................................19
5.1 Connection of Wire and Patch Board Terminal .......................19
5.2 Power Cord Cnnection...........................................................20
5.3 Connection of Communication Wire between Indoor Unit and
Outdoor Unit(or indoor unit) ........................................................20
5.4 Connect Communication Wire of Wired Controller................21
5.5 Illuminate for Connection of Wired Controller and Indoor Units
Network.........................................................................................21
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...............................................22
8 Troubleshooting ..............................................................................23

Low 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.
Please install the unit accordingto
instructions in this manual. Read
this manual carefully before
starting up or checking the
machine.
Installation should be
performed by dealer or
qualified technicians. Do
not install the product by
yourself. Improper
installation may result in
water leakage, electric
shock or fire hazard.
Make sure the local power supply
is in accordance with units before
installation, and check the power
supply carefully.
This air conditioner must be
properly grounded through
the receptacle to avoid
electric shock.The
grounding wire shouldn't
be connected with gas pipe,
water pipe, lightning
arrester or telephone line.
Please use specialized
accessories or parts to carry out
installation,or water leakage,
electric shock,fire hazard may
resulted.
R410A refrigerant can
produce poisonous gas
once it meets fire, so please
ventilate the room
immediately if refrigerant
leaks out during installation.
Diameter of power cord must be
large enough. Damaged power
cord and connecting wire must be
replaced by specialized electric
cable.
After the power cord is
connected, please install
the cover of electric box to
avoid danger.
Nitrogen must be charged
according to technical
requirements.
Short circuit is forbidden.
Do not cancel the pressure
switch in case the unit may
be damaged.

Low ESP Fan Coil Indoor Unit
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For units with wired controller, do
not connect power supply until the
wired controller is well installed.
Otherwise, the wired controller
cannot be used.
When the installation is
finished, please check and
make sure the drain pipe,
pipeline and electric wire
are all well connected in
order to avoid water
leakage, refrigerant
leakage, electric shock or
fire hazard.
Do not extend fingers or objects
into air outlet or air return grille.
If you use gas heater or
petroleum heater in the
same room, please open
the door or window to
maintain good air circulation
in case the room may lack
of oxygen.
Never start or stop the air
conditioner by inserting or
removing the power cord.
Do not turn off the air
conditioner until it runs for
at least 5 minutes.
Otherwise, oil-return of the
compressor will be affected.
Children are not allowed to
operate the air conditioner. Do not operate the air
conditioner with wet hands.
Please turn the unit off and
unplug your air conditioner
before cleaning. Otherwise, it
may cause electric shock or
personal injury.
Do not spray water on the
air conditioner or it will
cause malfunction or
electric shock.
Do not expose the air
conditioner directly to water or
place it in a damp or corrosive
environment.
Connect power supply 8
hours before operation. Do
not disconnect power if you
want to stop the unit in a
short period of time, e.g. in
one night. (This is for
protecting the compressor.)

Low ESP Fan Coil Indoor Unit
3
Volatile liquid like thinner or
gasoline will damage the
appearance of air conditioner.
(Please use soft dry cloth and wet
cloth with mild detergent to clean
the outer case of air conditioner.)
During Cooling mode,
indoor temperature should
not be set too low. Keep the
difference between indoor
temp and outdoor temp
within 5°C.
If abnormal condition occurs (e.g.
unpleasant smell), please turn off
the unit at once and disconnect
power supply. Then contact
LENNOX service center. If the air
conditioner continues to operate
despite of abnormal condition, the
unit may be damaged and it may
cause electric shock or fire
hazard.)
Do not repair the air
conditioner by yourself.
Improper repair will cause
electric shock or fire
hazard. Please contact
LENNOX service center
and have it repaired by
professional technicians.

Low ESP Fan Coil Indoor Unit
4
2 Product Introduction
2.1 Names of Key Components
Fig 2.1
No. ①②③
Name Air Outlet Air-return Opening Drain Pipe
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
Indoor Unit Working Temperature Range:16°C~ 32°C.
2.3 Unit Functions
Unit Functions Wired Controller
VEWCL1B(Standard)
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 √√
Remote Controller
VERCL1A

Low ESP Fan Coil Indoor Unit
5
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.
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 Sponge 2 To insulate the drain pipe
11 Fastener 8 To fasten the sponge

Low ESP Fan Coil Indoor Unit
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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 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.)
Fig 3.2
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).

Low ESP Fan Coil Indoor Unit
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3.3.1 Select communication line for indoor unit and wired controller
Fig 3.3.1
Wire Type Total Length of
Communication Line L(m) Wire Gauge (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
1)Total length of
communication line can't
exceed 250m.
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 ommunication
Line L(m) Wire Gauge (mm2) Wire Standard Remark
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000 ≥2×0.75 IEC
60227-5:2007
1) If the wire diameter is enlarged
to 2 ×1 mm2, the total
communication length line can
reach 1500 m.
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.

Low ESP Fan Coil Indoor Unit
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3.4 Wiring Requirements
(1)Power Cord Size and Air Switch Capacity
Model Power Cord Size Air Switch
Capacity Minimum Sectional Area of Ground Wire
Minimum
Sectional Area of
Power Cord
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
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 overload, which may cause accident.
③Above selection requirements: Power cord size is based on BV single-core wire (2~4pc) at
40°Cambient 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.
④If 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.
(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).
VELD007N432U
VELD008N432U
VELD009N432U
VELD011N432U
VELD012N432U
VELD013N432U
VELD015N432U
VELD018N432U
VELD019N432U
VELD021N432U
VELD024N432U
VELD027N432U
VELD031N432U
VELD034N432U
VELD038N432U
VELD042N432U
VELD048N432U

Low ESP Fan Coil Indoor Unit
9
4 Installation Instructions
4.1 Installation of Indoor Unit
4.1.1 Outline Dimension and Installation Spots
Equip with a 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 of
VELD007N432U~VELD021N432U.
Fig 4.4.1
Below are dimensions of A, B, C, etc. for different models: Unit:mm
Model A B C D E F G H I
742 491 700 615 200 121 528 161 580
942 491 900 615 200 121 728 161 780
1142 491 1100 615 200 121 928 161 980
VELD007N432U
VELD008N432U
VELD009N432U
VELD011N432U
VELD012N432U
VELD013N432U
VELD015N432U
VELD018N432U
VELD019N432U
VELD021N432U

Low ESP Fan Coil Indoor Unit
10
(2)Below are the outline dimension applicable to indoor units of
VELD024N432U~VELD048N432U.
Fig 4.1.2
Below are dimensions of A, B, C, etc. for different models: Unit:mm
Model A B C D E F G H I J
1236 565 1200 655 260 222 1016 220 1050 695
1379 565 1340 655 260 207 1153 220 1188 716
(1)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, as shown in fig 4.1.4.
Fig 4.1.3 Fig 4.1.4
VELD024N432U
VELD027N432U
VELD031N432U
VELD034N432U
VELD038N432U
VELD042N432U
VELD048N432U

Low ESP Fan Coil Indoor Unit
11
2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as
shown in fig 4.1.5.
Notes:
The length of bolt depends on the installation height of the unit, bolts are field supplied.
Fig 4.1.5
(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.
Fig 4.1.6
(6)Remove the washer locating plate and then tighten the nut on it.
(7)Remove the paper pattern.

Low ESP Fan Coil Indoor Unit
12
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.
Fig 4.2
(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.
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

Low ESP Fan Coil Indoor Unit
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(5)When the drainage pipelines are used for several units, the position of pipeline should be
about 100mm 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.
①metal clamp(accessory)
②drain hose(accessory)
Fig 4.3.2 Fig 4.3.3
(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)
(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)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

Low ESP Fan Coil Indoor Unit
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(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 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
(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 1000~1500mm.
Fig 4.3.10
4.3.3 Test of Drainage System
(1) After the electrical installation is finished, perform test for the drainage system.
(2) During the test, check whether water flows correctly through the pipeline and observe
carefully that there’s no water leakage at the junction.
(3) If this unit is installed for a new house, we suggest you perform the test before fitting the
ceiling.

Low ESP Fan Coil Indoor Unit
15
4.4 Installation of Air Duct
Notes:
①There should be insulating layer on air-out duct, air-return duct and fresh air duct to avoid
heat loss and moisture. Adhere a nail on the air duct and then add thermal sponge with a layer of
tin. Fasten it with a nail cover and then seal the junction with tin tapes; You can also use other
materials that have good insulation quality.
②Each air-out duct and air-return duct should be fixed on a pre-made board with iron frame.
The junction of air duct should be well-sealed in order to prevent air leakage.
③The design and construction of air duct should comply with national requirements.
④The edge of air-return duct is suggested to be more than 150mm away from the wall. Add
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 the Rectangular Duct
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
(2)Installation of Circular Duct
Fig 4.4.2

Low ESP Fan Coil Indoor Unit
16
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
(1)Range of Capacity 7000~21000
Fig 4.4.3 Air Outlet
Fig 4.4.4 Air-return Opening
Model Size of Air Outlet Size of Air-return Opening
A B C D
121 528 580 161
121 728 780 161
121 928 980 161
(2)Range of Capacity 24000~48000
Fig 4.4.5 Air Outlet
Fig 4.4.6 Air-return Opening
VELD007N432U
VELD008N432U
VELD009N432U
VELD011N432U
VELD012N432U
VELD013N432U
VELD015N432U
VELD018N432U
VELD019N432U
VELD021N432U

Low ESP Fan Coil Indoor Unit
17
Model Size of Air Outlet Size of Air-return Opening
A B C D E F
1016 222 21 1050 220 21
1153 207 40 1188 220 22
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 4.4.7.
Fig 4.4.7
(2)If the bottom return air is desired, just change the place of the rectangular flange and the
return air cover plate.
(3)Connect one end of the return air duct to the return air outlet of the unit by rivets and the
other to the return air louver. For the sake of the convenience to freely adjust the height, a
cutting of canvas duct will be helpful, which can be reinforced and folded by 8# iron wire.
(4)More noise is likely to be produced in the bottom return air mode than the rear return air
mode, so it is suggestive to install a silencer and a static pressure box to minimize the
noise.
(5)The installation method can be choosen with considering the conditions of the building and
maintenance etc., as shown in Fig 4.4.8.
VELD024N432U
VELD027N432U
VELD031N432U
VELD034N432U
VELD038N432U
VELD042N432U
VELD048N432U