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
2
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
6
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.