Lennox VEPS075N432K User manual

DC Inverter Multi VRF System User Manual
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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 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.
(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 Product Introduction ......................................................................................................1
2.1 Names of Main Parts ............................................................................................................... 4
2.2 Combinations of Indoor and Outdoor Units ............................................................................. 4
2.3 Operating Range ..................................................................................................................... 4
3 Preparation before Installation ......................................................................................5
3.1 Standard Parts......................................................................................................................... 5
3.2 Installation Site ........................................................................................................................ 5
3.3 Piping Work Requirements ...................................................................................................... 6
4 Installation Instruction ...................................................................................................6
4.1 Dimension of Outdoor Unit and Mounting Hole ....................................................................... 7
4.2 Connection Pipe ...................................................................................................................... 8
4.3 Installation of Connection Pipe .............................................................................................. 12
4.4 Vacuum Pumping, Refrigerant Adding................................................................................... 17
4.5 Electric Wiring........................................................................................................................ 19
5 Check Items after Installation and Test Operation .....................................................22
5.1 Check Items after Installation ................................................................................................ 22
5.2 Test Operation and Debugging.............................................................................................. 23
6 Common Malfunctions and Troubleshooting.............................................................28
7 Error Indication ............................................................................................................. 29
8 Maintenance and Care..................................................................................................31
8.1 Outdoor Heat Exchanger....................................................................................................... 31
8.2 Drain Pipe.............................................................................................................................. 31
8.3 Notice before Seasonal Use.................................................................................................. 32
8.4 Maintenance after Seasonal Use .......................................................................................... 32
8.5 Parts Replacement ................................................................................................................ 32
9 After-sales Service........................................................................................................32

DC Inverter Multi VRF System
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.
Follow this manual to
complete the installation work.
Please read this manual
carefully before turning on or
repairing the unit.
Installation should be
performed by the distributor or
qualified technicians. Do not
install the product by yourself.
Improper installation may lead
to water leakage, electric
shock or fire hazard, etc.
Before installation, please
check whether the power
supply is complied with that
specified on the nameplate
and check the safety of the
power supply.
The air conditioner must be
grounded reliably for avoiding
electric shock. Please do not
connect the earthing wire to
gas pipe, water pipe, lightning
rod or telephone line.
Be sure to use special
accessories and parts for
installation to prevent water
leakage, electric shock and
fire hazard, etc.
If refrigerant leakage
happens, please ventilate the
room immediately.
Diameter of power cord
should be large enough. The
damaged power cord and
connection wire must be
replaced with special cables.
When the power cord is
connected, please fix the
electric box cover properly to
avoid safety accidents.

DC Inverter Multi VRF System
2
Never fail to comply with the
nitrogen-charging welding
process. Do charge nitrogen
when welding the pipes.
Never short circuit or cancel
the pressure switch to prevent
unit damage.
As for the unit controlled by
the wired controller, connect
the wired controller well firstly
and then energize the unit;
otherwise, the unit can’t
operate normally.
When installation is finished,
please check whether the
drainage pipes, pipelines and
electric wires are connected
correctly to avoid water
leakage, refrigerant leakage,
electric shock or fire, etc.
Do not insert fingers or objects
into air outlet or air return
grille.
Open the door and window
frequently to keep good
ventilation for avoiding oxygen
deficit when gas heater or oil
heater is used in the room.
Never plug in or unplug the
power plug directly to turn on
or turn off the air conditioner.
Once the air conditioner is
turned on, it can be turned off
only after it has operated for
5min at least; otherwise, it will
affect the oil return of
compressor.
Do not allow children to
operate this air conditioner. Do not operate this air
conditioner with wet hands.
The air conditioner can be
cleaned only when it has been
turned off and the power has
been cut off; otherwise, it may
cause electric shock or injury.
Never spray or flush water
towards the air conditioner;
otherwise, malfunction or
electric shock may happen.
Do not expose the air
conditioner to the moist or
corrosive environment.
Put through the power 8 hours
in advance before operation.
Do not cut off the power when
the air conditioner stops
operation for only about one
night (protect the
compressor).

DC Inverter Multi VRF System
3
Volatile liquid, such as diluent
or gasoline, will damage the
appearance of air conditioner.
Only soft dry cloth and wet
cloth dipped with neutral
detergent can be used to
clean the outer case of air
conditioner.
Under cooling mode, please
don't set the room
temperature too low; keep the
temperature difference
between indoor and outdoor
within 5°C (41°F).
If there are any abnormal
circumstances (such as
burning smell, etc.), please
turn off the unit and cut off the
main power supply
immediately, and then contact
LENNOX appointed service
center. If those abnormal
circumstances still exit, the
unit may be damaged and it
may lead to electric shock or
fire hazard.
Do not repair the unit by
yourself. Wrong maintenance
may cause electric shock or
fire hazard. Please contact
LENNOX appointed service
center for help.
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.
Install units according to national wiring codes.
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.
An all-pole disconnection device which has at least 3mm clearances in all poles, and disconnection must be
incorporated in the fixed wiring in accordance with the wiring rules.
LENNOX will not assume responsibility for any personal injury or property loss caused
by improper installation, improper debugging, unnecessary repair or not following the instructions of this manual.
2 Product Introduction
LENNOX Multi VRF System adopts inverter compressor technology. By changing the displacement of
compressor, stepless capacity regulation within range of 10%~100% can be realized. Various product
lineups are provided with capacity range from 22.4kW to 35kW, which can be widely used in residential,
commercial and working area and especially applicable to places with big load change. LENNOX residential
air conditioner is absolutely your best choice.

DC Inverter Multi VRF System
4
2.1 Names of Main Parts
Fig.1
No.
①②③④⑤
Name Motor Fan blade Electric box
assembly
Gas pipe valve Liquid pipe valve
2.2 Combinations of Indoor and Outdoor Units
(1) See below the number of indoor units that can be connected to the outdoor unit.
(2) The total capacity of indoor units should be within 50%~135% of that of the outdoor unit.
Model
Max sets of connectable IDUs
VEPS075N432K
13
VEPS096N432K
17
VEPS120N432K
20
(3) can be connected to various indoor units. When any one of the indoor units receives operating
command, outdoor unit will start operation as per required capacity. When all indoor units stop,
outdoor unit will be shut off.
2.3 Operating Range
Cooling
Outdoor temperature: -5°C~48°C
Heating
Outdoor temperature: -20°C~27°C