Lennox VRF VEAH024N432P Installation instructions

VEAH024N432P
VEAH030N432P
VEAH034N432P
VEAH038N432P
VEAH048N432P
INSTALLATION/OPERATION
INSTRUCTIONS
VEAir Handler
VRF SYSTEMS
INDOOR UNITS
©2016 Lennox Industries Inc.
Dallas, Texas, USA
And valid combinations
(see instructions inside)
Thank you for selecting LENNOX air conditioners.Please read this manual
carefully before operation and keep it for further reference.
Thank you for selecting
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
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

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) 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 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
responsible for their safety.Children should be supervised to ensure that they do not play with
the appliance.
Correct Disposal of this product
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.

Contents
1 Safety Precautions................................................................................................................................ 1
2 Product Introduction ............................................................................................................................ 3
2.1 Names of Key Components ............................................................................................................... 3
2.2 Rated Working Condition.............................................................................................................. 3
2.3 Unit Functions................................................................................................................................. 3
3. Preparative for Installation.................................................................................................................. 4
3.1 Pre-Installation Instruction ............................................................................................................ 4
3.1.1 Checking Product Received .................................................................................................... 4
3.1.2 Before Installation .................................................................................................................. 4
3.1.3 Codes & Regulations............................................................................................................... 4
3.1.4 Replacement Parts.................................................................................................................. 5
3.2 Important Safety Instructions........................................................................................................ 5
3.3 Requirements for Communication Line ...................................................................................... 6
3.3.1 Select communication line for indoor unit and wired controller ........................................... 6
3.3.2 Select communication line for indoor unit and outdoor unit ......................................... 7
3.4 Wiring Requirements..................................................................................................................... 8
4 Installation Instructions........................................................................................................................ 9
4.1 Dimension Data.............................................................................................................................. 9
4.2 Location......................................................................................................................................... 10
4.2.1 Installation Site .....................................................................................................................10
4.2.2 Air Handler ........................................................................................................................... 10
4.3 Piping Work................................................................................................................................... 11
4.3.1 Specification of Connection Pipe.................................................................................... 11
4.3.2 Piping Preparation............................................................................................................ 11
4.4 Condensate Removal.................................................................................................................. 12
4.5 Ductwork ....................................................................................................................................... 12
4.6 Installation of Wired Controller................................................................................................... 12
5 Wiring Work ....................................................................................................................................... 13
5.1 Connection of Wire and Patch Board Terminal .......................................................................13
5.2 Power Cord Connection.............................................................................................................. 14
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or indoor unit)
............................................................................................................................................................... 14
5.4 Connect Communication Wire of Wired Controller.................................................................14
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network............................ 15
6 Routine Maintenance......................................................................................................................... 17
6.1 Cleaning of Filter.......................................................................................................................... 17
6.2 Maintenance before the Seasonal Use .................................................................................... 17
6.3 Maintenance after the Seasonal Use........................................................................................ 17
7 Table of Error Codes for Indoor Unit.................................................................................................. 18
8 Troubleshooting ................................................................................................................................. 18

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.
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.
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.
Lennox VRF Air Handler Indoor Unit

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Do not insert fingers or
objects into air outlet/inlet
grille.
Never start up or shut off
the air conditioner by
means of directly plug or
unplug the power cord.
Do not allow children
operate this unit.
Turn off the unit or cut off
the power supply before
cleaning the unit, otherwise
electric shock or injury may
happen.
Do not expose the unit to
the moist or corrosive
circumstances.
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.
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.
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.
Turn off the unit after it runs
at least five
minutes; otherwise it will
influence oil return of the
compressor.
Do not operate this unit with
wet hands.
Never spray or flush
water towards unit,
otherwise malfunction or
electric shock may happen.
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).
Under cooling mode, please
don't set the room
temperature too low and
keep the temperature
difference between indoor
and outdoor unit within 5.
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 VRF Air Handler Indoor Unit

Lennox VRF Air Handler Indoor Unit
3
2 Product Introduction
2.1 Names of Key Components
Fig 2.1
2.2 Rated Working Condition
Indoor Side Condition Outdoor Side Condition
Dry Bulb Temp℃(℉) Wet Bulb Temp℃(℉) Dry Bulb Temp℃(℉) Wet Bulb Temp℃(℉)
Rated Cooling 27(80.6) 19(66.2) 35(95) 24(75.2)
Rated Heating 20(68.0) 15(59.0) 7(44.6) 6(42.8)
Indoor Unit Working Temperature Range: 16°C~ 32°C.
2.3 Unit Functions
Unit Functions Wired Controller
VEWCL1B (Standard)
Remote Controller
VERCL1A (Optional) Remote Controller
VERCL1B (Optional)
Operation Mode
(Cooling, Heating, Fan,
Dehumidifying)

4
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
Note!
①√: included, X: not included
②Please refer to the user manual of Wired Controller or Remote Controller for function
details
3. Preparative for Installation
3.1 Pre-Installation Instruction
3.1.1 Checking Product Received
After receiving the product, please check if there is any damage caused by
transportation.Shipping damage is the responsibility of the carrier. Verify the model number,
specifications and accessories are correct prior to installation. The distributor or manufacturer will
not accept claims from dealers for transportation damage or installation of incorrectly shipped
units.
3.1.2 Before Installation
Carefully read all instructions for the installation prior to installing product. Make sure each
step or procedure is understood and any special considerations are taken into account before
starting installation. Assemble all tools, hardware and supplies needed to complete the installation.
Some items may need to be purchased locally. Make sure everything needed to install the product
is on hand before starting.
3.1.3 Codes & Regulations
This product is designed and manufactured to comply with national codes. It is installer‟s
responsibilities to install the product in accordance with such codes and/or any prevailing local
Lennox VRF Air Handler Indoor Unit

5
codes/regulations. The manufacturer assumes no responsibilities for equipment installed in
violation of any codes or regulations.
3.1.4 Replacement Parts
When reporting shortages or damages, or ordering repair parts, give the complete product
model and serial numbers as stamped on the product. Replacement parts for this product are
available through your contractor or local distributor.
3.2 Important Safety Instructions
Recognize Safety Symbols, Words, and Labels
The following symbols and labels are used throughout this manual to indicate immediate or
potential hazards. It is the owner‟s responsibility to read and comply with all safety information and
instructions accompanying these symbols. Failure to heed safety information increases the risk of
serious personal injury or death, property damage and/or product damage.
DANGER: Immediate hazards which will result in property damage, product damage,
severe personal injury or death.
WARNING: Hazards or unsafe pratices could result in property damage, product
damage, severe personal injury or death.
CAUTION: Hazards or unsafe practices which may result in property damage, product
damage, severe personal injury or death.
WARNING: Before serving or installing this equipment. The electrical power to this unit
must be in the “off” position. Caution, more than one disconnect may exist. Failure to observe this
warning may result in an electrical shock that can cause personal injury or death.
WARNING: The United States environmental protection agency („epa”) has issued
various regulations regarding the introduction and disposal of refrigerants introduced into this unit.
Failure to follow these regulations may harm the enviroment and can lead to the imposition of
substantial fines. These regulations may vary due to the passage of laws. A certified technician
must perform the installation and service of this product. Should questions arise, contact your local
epa office.
WARNING: Due to high system pressure and electrical shock in potential, installation
and service work can be dangerous. Only trained and qualified personnels are permitted to install
or service this equipment. Observe all warnings contained in this manual and labels/tags attached
to the equipment.
WARNING: This product is factory shipped for use with a 208-230/1/60 electrical power
supply. This air handler must not be reconfigured to operate with any other power supply.
WARNING: The unit must have an uninterrupted, unbroken electric grounding to
minimize the possibility of personal injury if an electric fault occurs. The electric grounding circuit
Lennox VRF Air Handler Indoor Unit

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may consist of an appropriate sized power cord which connected with the grounding piece located
in the unit control box and also connecting to the building electric service panel. Other methods of
grounding are permitted if performed in accordance with the “national electric code” (nec)/
“american national standards institute” (ansi)/ “national fire protection association” (nfpa) 70 and
local/state codes. In canada, electric grouding conforms to the canadian electric code csa c22.1.
failure to observe this warning can result in electrical shock that can cause personal injury.
Special warning for installation of furnaces or air handling units in enclosed areas,
such as garages, utility rooms or parking areas.
Carbon monoxide producing devices (such as an automobile, space heater, gas water heater,
etc.) should not be operated in enclosed areas such as unventilated garages, utility rooms or
parking areas because of the danger of carbon monoxide (CO) poisoning resulting from the
exhaust emissions.If a furnace or air handler is installed in an enclosed area such as a garge,
utility room or parking area and a carbon monoxide producing device is operated therein, there
must be adequate ventilation directly to outside.
This ventilation is necessary to avoid the danger of CO poisoning which can occur if a carbon
monoxide producing device continues to operate in the enclosed area. Carbon monoxide emission
can be (re)circulated throughout the building if the furnace or air handler is operating in any mode.
CO can cause serious illness including permanent brain damage or death.
3.3 Requirements for Communication Line
Note:
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).
3.3.1 Select communication line for indoor unit and wired controller
Fig 3.3.1
Lennox VRF Air Handler Indoor Unit

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Wire type
Total length of
communication wire between
indoor unit and wired
controller (m/feet)
Wire diameter
(mm2/AWG) Wire standard Remark
Light/Ordinary
polyvinyl
chloride
sheathed
cord. (60227
IEC 52/60227
IEC 53)
L≤250(850) 2×0.75~2×1. 5
(2×18~2×16) IEC 60227-5
1. Total length of
communication cable can't
exceed 250m (850feet).
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
communication wire
between indoor unit and
indoor unit(outdoor unit)
(m/feet)
Wire diameter
(mm2/AWG) Wire standard Remark
(communication
line for indoor
unit)
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000(3280) ≥2×0.75(2×18) IEC 60227-5
1. If the wire diameter is
enlarged to 18AWG, the total
communication cable length
can reach 1500m (4920
feet).
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.
(communication
line for outdoor
unit)
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60245 IEC 57)
L≤1000(3280) ≥2×0.75(2×18) IEC 60227-5 /
IEC 60245-1
Lennox VRF Air Handler Indoor Unit

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3.4 Wiring Requirements
(1) Power Cord Size and Air Switch Capacity
Model Power Cord Size
Air Switch
apacity
(A)
Minimum
Sectional Area
of Ground Wire
Minimum Sectional
Area of Power
Cord(mm2)
VEAH024N432P
208/230V-1ph-60Hz
6 1.0 1.0
VEAH030N432P 6 1.0 1.0
VEAH034N432P 6 1.0 1.0
VEAH038N432P 6 1.0 1.0
VEAH048N432P 6 1.0 1.0
(1) Use copper wire only as unit‟s power cord. Operating temperature should be within its rated
value.
(2) If the power cord is more than 15 m (49-1/4 feet) long, please increase properly the sectional
area of power cord to avoid overload, which may cause accident.
(3) Above selection requirements: Power cord size is based on BV single-core wire (2~4pc) at
40° (104°F) Cambient temperature when laying across plastic pipe. Air switch is D type and
used at 40°C (104°F). If actual installation condition varies, please lower the capacity
appropriately according to the specifications of power cord and air switch provided by
manufacturer.
(4) Install cut-off device near the unit. The minimum distance between each stage of cut-off
device should be 3 mm (1/8 inch) (The same for both indoor unit and outdoor unit).
Lennox VRF Air Handler Indoor Unit

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4 Installation Instructions
4.1 Dimension Data
Fig 4.1
Unit: Inch (mm)
MODEL DIMENSION
W D H A B
18-1/8"(460) 21-1/4"(540) 43-1/2"(1105) 11-5/8"(295) 16-3/4"(426)
18-1/8"(460) 21-1/4"(540) 43-1/2"(1105) 11-5/8"(295) 16-3/4"(426)
21-1/4"(540) 21-1/4"(540) 48-1/4"(1224) 11-5/8"(295) 20"(508)
21-1/4"(540) 21-1/4"(540) 48-1/4"(1224) 11-5/8"(295) 20"(508)
24-7/8"(630) 21-1/4"(540) 48-1/4"(1224) 11-5/8"(295) 20"(508)
VEAH024N432P
VEAH030N432P
VEAH034N432P
VEAH038N432P
VEAH048N432P
Lennox VRF Air Handler Indoor Unit

10
4.2 Location
4.2.1 Installation Site
◆A place where cool air can be distributed throughout the room.
◆A place where condensation water is easily drained out.
◆A place that can bear the weight of indoor unit.
◆A place which is easy for maintenance.
◆A place where easy connection with the outdoor unit is available.
◆A place where is 1m or more away from other electric appliances such as television, audio
device, etc.
◆Avoid a location where there is heat source, high humidity or inflammable gas.
◆Do not place the unit near a laundry, a bath, a shower or a swimming pool.
◆Be sure that the installation conforms to the installation dimension diagram.
◆The space around the unit is adequate for ventilation
4.2.2 Air Handler
WARNING: This air handler is designed for indoor installation only. Do not install it
outdoors.
When installing the air handler, take consideration to minimize the length of refrigerant tubing
as much as possible. Do not install the air handler in a location either above or below the
condenser that violates the instructions provided with the condenser. Service clearance is to take
precedence. Allow a minimum of 24” in front of the unit for service clearance. When installing in an
area directly over a finished ceiling (such as an attic), an emergency drain pan is required directly
under the unit. See local and state codes for requirements. When installing this unit in an area that
may become wet, elevate the unit with a sturdy, non-porous material. In installations that may lead
to physical damage (i.e. a garage) it is advised to install a protective barrier to prevent such
damage.
This air handler is designed for a complete supply and return ductwork system. Do not
operate this product without all ductwork attached.
Based upon the actual conditions, if air handler is installed as Fig 4.2(A), the air handler
should be concealed in a specific room or space and make sure the air handler is not accessible to
the general public.
Based upon the actual conditions, if air handler is installed as Fig 4.2(B), make sure that there
is enough space for care and maintenance and the height between the air handler and ground is
above 2500mm. And the air handler is not accessible to the general public.
Lennox VRF Air Handler Indoor Unit

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(A) (B)
Fig 4.2
4.3 Piping Work
4.3.1 Specification of Connection Pipe
Model External Diameter (inch)
Gas Pipe(in) Liquid Pipe(in)
5/8 3/8
5/8 3/8
5/8 3/8
5/8 3/8
5/8 3/8
4.3.2 Piping Preparation
All cut ends are to be round, burr free, and cleaned. Failure to follow this practice increases
the chances for refrigerant leakage.
Fig 4.3.
VEAH024N432P
VEAH030N432P
VEAH034N432P
VEAH038N432P
VEAH048N432P
Lennox VRF Air Handler Indoor Unit

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4.4 Condensate Removal
The drain pan has primary and secondary drain connection (Figure 8). Condensate removal is
performed by attaching a 3/4” PVC pipe to the evaporator coil pan and terminated in accordance
with local or state Plumbing/HVAC codes. The installation must include a “P” style trap that is
located closely to the evaporator coil. Do not over-tighten the drain connection(s) in order to
prevent possible damage to the evaporator drain pan.
See Fig 4.6 for details of a typical condensate line “P” trap.
Fig 4.4
4.5 Ductwork
This air handler is designed for a complete supply and return ductwork system.
WARNING: Do not operate the unit without all ductwork completed.
Do not operate this product without all ductwork attached.
Inadequate ductwork that restricts airflow can result in improper performance and compressor
or heater failure. Ductwork is to be constructed in a manner that limits restrictions and maintains
suitable air velocity. Ductwork is to be sealed to the unit in a manner that will prevent leakage.
Return Ductwork: Do not terminate the return ductwork in an area that can introduce toxic, or
objectionable fumes/odors into the ductwork. The return ductwork is to be introduced into the air
handler bottom (upflow configuration).
Return Air Filters: Each installation must include a return air filter. This filtering may be
performed at the air handler or externally such as a return air filter grille.
4.6 Installation of Wired Controller
Please refer to User Manual of Wired Controller for the installation details.
Note: When installation is finished, the unit must be tested and debugged before
operation. Please refer to Instruction Manual of ODU for auto addressing and debugging
details.
Lennox VRF Air Handler Indoor Unit

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5 Wiring Work
WARNING!
Before obtaining access to terminals, all supply circuits must be disconnected.
Note:
（1）Units must be earthed securely, or it may cause electric shock.
（2）Please carefully read the wiring diagram before carry out the wiring work, incorrect
wiring could cause malfunction or even damage the unit.
（3）The unit should be powered by independent circuit and specific socket.
（4）The wiring should be in accordance with related regulations in order to ensure the units
reliable running.
（5）Install circuit breaker for branch circuit according to related regulations and electrical
standards.
（6）Keep cable away from refrigerant pipings, compressor and fan motor.
（7）The communication wires should be separated from power cord and connection wire
between indoor unit.
（8）Adjust the static pressure via wired controller according to site circumstance.
（9）If the supply cord is damaged, it must be replaced by manufacturer, its service agent or
similarly qualified persons in order to avoid a hazard.
5.1 Connection of Wire and Patch Board Terminal
（1）The connection of wire (as shown in fig 5.1.1)
1）Strip about 25mm (1 inch) insulation of the wire end by stripping and cutting tool.
2）Remove the wiring screws on the terminal board.
3）Shape the tail of wire into ring by needle nose plier, and keep the gauge of ring in
accordance with screw.
4）Use the screwdriver for tightening the terminal.
（2）The connection of stranded wire (as shown in fig 5.1.2)
1）Strip about 10mm (3/8 inch) insulation of the end of stranded wire by stripping and
cutting tool.
2）Loosen the wiring screws on terminal board.
3）Insert the wire into the ring tongue terminal and tighten by crimping tool.
4）Use the screwdriver for tightening the terminal.
Fig 5.1-1 Fig 5.1-2
Lennox VRF Air Handler Indoor Unit

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5.2 Power Cord Connection
NOTICE! All indoor units must be unified of power supply so that they can be powered
ON/OFF at the same time.
Fig 5.2
●For units with single-phase power supply.
（1）Detach the electric box lid.
（2）Let the power cord pass through the wiring through-holes.
（3）Connect the power cord to terminal "L, N, ".
（4）Fix the power cord with wiring clamp.
5.3 Connection of Communication Wire between Indoor Unit and Outdoor
Unit (or indoor unit)
(1) Detach the electric box lid.
(2) Let the Communication cable pass through the wiring through-holes.
(3) Connect the communication wire to terminal D1 and D2 of indoor 4-bit wiring board, as
shown in fig5.3.1.
Fig 5.3.1 Fig 5.3.2
(4) Fix the communication cable with clamp of electric box.
(5) For more reliable communication, make sure connect the terminal resistor to the most
downstream IDU of the communication bus (terminal D1 and D2), as shown in fig 5.3.2,
terminal resistor is provided with each ODU.
5.4 Connect Communication Wire of Wired Controller
(1) Open electric box cover of indoor unit.
(2) Let the communication wire go through the rubber ring.
(3) Connect the communication wire to terminal H1 and H2 of indoor 4-bit wiring board.
Lennox VRF Air Handler Indoor Unit

15
(4) Fix the communication wire with wire clip on the electric box.
(5) Wiring instructions of remote receiving light board and wired controller:
1) Fig 5.4.1 shows the installation of wired controller.
Fig 5.4.1
2) Wired controller and receiving light board can be installed at the same time. When
operating through a remote controller, both wired controller and the receiving light
board can receive the signals.
5.5 Illuminate for Connection of Wired Controller and Indoor Units
Network
(1) Communication wire of indoor unit and outdoor unit (or indoor unit) is connected to D1,
D2.
(2) Wired controller is connected to H1, H2.
(3) One indoor unit can connect two wired controllers that must be set as master one and
slave one.
(4) One wired controller can control 16 indoor unitS in maximum at the same time. (As
shown in fig5.5)
Note:
(1) The type of indoor units must be the same if they are controlled by the same wired
controller.
(2) When the indoor unit is controlled by two wired controllers, the addresses of the two
wired controllers should be different through address setting. Address 1 is for main
controller; Address 2 is for slave controller. Detailed setting please refer to the
instruction manual of wired controller.
Lennox VRF Air Handler Indoor Unit

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Fig 5.5
Lennox VRF Air Handler Indoor Unit