Lennox VEMD007N432U User manual

VEMD008N432U
VEMD009N432U
VEMD011N432U
VEMD012N432U
VEMD013N432U
VEMD015N432U
VEMD018N432U
VEMD019N432U
VEMD021N432U
VEMD024N432U
VRF Iutdoor Units
Installation Manual
ESP Fan Coil Indoor Unit
Thank you for selecting LENNOX air conditioners. Please read this manual carefully before operation
and keep it for further reference.
VEMD007N432U
Medium

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.

Contents
1 Safety Notices (Please be sure to abide)................................................................. 1
2 Safety Precautions..................................................................................................... 2
3 Product Introduction ................................................................................................. 4
3.1 Names of Key Components .............................................................................................. 4
3.2 Rated Working Condition .................................................................................................. 4
4 Preparations for Installation ..................................................................................... 4
4.1 Standard Fittings............................................................................................................... 5
4.2 Location for Installation..................................................................................................... 5
4.3 Requirements for Communication Line ............................................................................. 6
4.4 Wiring Requirements ........................................................................................................ 8
5 Installation Instructions ............................................................................................ 9
5.1 Installation of Indoor Unit .................................................................................................. 9
5.2 Pipe Connection ..............................................................................................................12
5.3 Installation and Test of Drain Pipe....................................................................................12
5.4 Installation of Air Duct ......................................................................................................16
5.5 Installation of Wired Controller .........................................................................................18
6 Wire Connection ...................................................................................................... 19
6.1 Connection of Wire and Wiring Board Terminal................................................................19
6.2 Power Cord Connection...................................................................................................20
6.3 Connection of Communication Line of IDU and ODU.......................................................21
6.4 Connection of Communication Line of Wired Controller...................................................21
6.5 Instructions on Connecting Wired Controller and IDU Network ........................................22
7 General Maintenance............................................................................................... 24
7.1 Cleaning of Air Filter ........................................................................................................24
7.2 Maintenance Before Use-season.....................................................................................24
7.3 Maintenance After Use-season ........................................................................................24
8 Malfunction Codes of IDU ....................................................................................... 25
9 Troubleshooting....................................................................................................... 26

Multi Variable Air Conditioners Duct 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.
NOTE:
①For evaporating units and condensing units, the instructions or markings shall include
wording to assure that the maximum operating pressure is considered when connecting
to any condenser unit or evaporator unit.
②For evaporating units, condensing units and condenser units, the instructions or
markings shall include refrigerant charging instructions.
③A warning to assure that partial units shall only be connected to an appliance suitable for
the same refrigerant.
④This unit is a partial unit air conditioner, complying with partial unit requirements of this
International Standard, and must only be connected to other units that have been
confirmed as complying to corresponding partial unit requirements of this International
Standard.
⑤The electrical interfaces shall be specified with purpose, voltage, current, and safety
class of construction.
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.

Multi Variable Air Conditioners Duct Type Indoor Unit
2
2 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.
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
nitrogen charge requirements.
Charge nitrogen when welding
pipes.
Never short-circuit 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.

Multi Variable Air Conditioners Duct Type Indoor Unit
3
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 immediately 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.
Any personal injury or property loss caused by improper installation, improper debug,
unnecessary repair or not following the instructions of this manual should not be the responsibility of
LENNOX.

Multi Variable Air Conditioners Duct Type Indoor Unit
4
3 Product Introduction
3.1 Names of Key Components
Fig 3.1
NO. ①②
(with water
pump)
③④⑤⑥
Name Electric box water pump Air Outlet Hooker
Air-return
Opening
Drain Pipe
3.2 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
4 Preparations for Installation
NOTE: Product graphics are only for reference. Please refer to actual products. Unspecified
measure unit is mm.

Multi Variable Air Conditioners Duct Type Indoor Unit
5
4.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
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≥15.9mm
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
4.2 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.

Multi Variable Air Conditioners Duct Type Indoor Unit
6
Fig4.2.1
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.
4.3 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).
4.3.1 Select Communication Line for Indoor Unit and Wired Controller
Fig4.3.1