Gree GMV-ND28ZD/A-T User manual

Change for life
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.If you have lost the Owner’s Manual, please
contact the local agent or visit www.gree.com or sent email to [email protected] or
electronic version.
GREE reserves the right to interpret this manual which will be subject to any change due to
product improvement without further notice.
GREE Electric Appliances, Inc. of Zhuhai reserves the nal right to interpret this manual.
Multi Variable Air Conditioners
Floor and Ceiling Type Indoor Unit
Models:
GMV-ND28ZD/A-T GMV-ND36ZD/A-T
GMV-ND50ZD/A-T GMV-ND63ZD/A-T
GMV-ND71ZD/A-T GMV-ND90ZD/A-T
GMV-ND112ZD/A-T GMV-ND125ZD/A-T
GMV-ND140ZD/A-T
Air Conditioners
Owner's Manual

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 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.
●DISPOSAL: 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.............................................................................................................................4
3 Preparations for Installation.................................................................................................. 5
3.1 Standard Fittings.........................................................................................................................5
3.2 Installation Position Selection .....................................................................................................5
3.3 Requirements of Communication Wire Selection .......................................................................6
3.4 Wiring Requirements ..................................................................................................................7
4 Installation Instructions......................................................................................................... 8
4.1 Installation of Indoor Unit ............................................................................................................8
4.2 Refrigerant Pipe Connection.....................................................................................................10
4.3 Drainage Pipe Installation and Drainage System Testing ......................................................... 11
4.4 Installation of Wired Controller .................................................................................................14
5 Wiring Work........................................................................................................................ 15
5.1 Connection of Wire and Patch Board Terminal........................................................................15
5.2 Power Cord Connection............................................................................................................16
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit(or indoor unit) ....16
5.4 Connection of Communication Wire for Wired Controller .........................................................17
5.5 Wiring Instructions of Wired Controller and Indoor Units Network............................................17
6 Routine Maintenance.......................................................................................................... 19
6.1 Cleaning of Filter.......................................................................................................................19
6.2 Maintenance before the Seasonal Use.....................................................................................19
6.3 Maintenance after the Seasonal Use........................................................................................19
7 Table of Error Codes for Indoor Unit................................................................................... 20
8 Troubleshooting.................................................................................................................. 20

Multi Variable Air Conditioners Floor and Ceiling Type 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.
Exclusive
accessory
exclusive
Follow this instruction to complete
the installation work. Please
carefully read this manual before
unit startup and service.
Please rstly connect the wired
controller before energization,
otherwise wired controller can
not be used.
Wire size of power cord should
be large enough.The damaged
power cord and connection wire
should be replaced by exclusive
cable.
Never fail to comply with the
nitrigen charge requirements.
Charge nitrogen when welding
pipes.
Before installation, please check if
the power supply is in accordance
with the requirements specied on
the nameplate. And also take care
of the power safety.
Installation should be conducted
by dealer or qualied personnel.
Please do not attempt to install the
unit by yourself. Improper handling
may result in water leakage,
electric shock or re disaster etc.
Be sure to use the exclusive
accessory and part to prevent the
water leakage, electric shock and
re accidents.
Before using the unit, please check
if the piping and wiring are correct
to avoid water leakage, refrigerant
leakage, electric shock, or re etc.
If refrigerant leakage happens
during installation, please ventilate
immediately. Poisonous gas will
emerge if the refrigerant gas meets
re.
After connecting the power cord,
please x the electric box cover
properly in order to avoid accident.
Never short-circiut or cancel the
pressure switch to prevent unit
damage.
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.
N 2

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
2
If anything abnormal happens
(such as burning smell), please
power off the unit and cut off
the main power supply, and
then immerdiately contact Gree
appointed service center.If
abnormality keeps going, the unit
might be damaged and lead to
electric shock or re.
User is not allowed to repair the
unit. Fault service may cause
electric shock or re accidents.
Please contact Gree appointed
service center for help.
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.
Open the door and window and
keep good ventilation in the room
to avoid oxygen decit when
the gas/oil supplied heating
equipment is used.
Turn off the unit after it runs at
least ve minutes; otherwise it
will inuence oil return of the
compressor.
Do not operate this unit
with wet hands.
Never spray or ush 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.
＜5Min
24H
26 C
30 C

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
3
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
Gree Electric Appliances, Inc. of Zhuhai.
2 Product Introduction
2.1 Names of Key Components
12
3
4
56
No. ① ② ③ ④ ⑤ ⑥
Name Drainage Pipe Connection
Pipe
Air Inlet Grille
(With Filter) Louver Main Unit Display board
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

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
4
2.3 Unit Functions
Unit Functions Wired Controller
XK46(Optional)
Wired Controller
XK49(Optional)
Remote Controller
YAD1F(Standard)
Remote Controller
YV1L1(Optional)
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
Notes:
① √: included, X: not included.
② Please refer to the user manual of Wired Controller or Remote Controller for function details.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
5
3 Preparations for Installation
Note: Product graphics are only for reference. Please refer to actual products. Unspecied
measure unit is mm.
3.1 Standard Fittings
Use the following provided accessories according to the requirement.
No. Name Appearance Q’ty Usage
1 Remote controller 1+2 To control the indoor unit
2 Special nut 1 To connect gas pipe
3 Special nut 1 To connect liquid pipe
4 M10X8 nut with washer 8 To be used together with the suspension
bolt for installing the unit.
5 Insulation 1 To insulate the gas pipe
6 Insulation 1 To insulate the liquid pipe
7 Installation Paperboard
4-φ12
1Locate the drill hole on ceiling
Or Wall
8 Fastener 4 To fasten the sponge
3.2 Installation Position Selection
(1) The location should be able to withstand the weight of unit.
(2) The water can be drained conveniently from drainage pipe.
(3) There should be no obstruction near air inlet and air outlet.
Unit: mm
◆ Floor type
>600
>1000
>300
>600
>1500
◆ Ceiling type

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
6
>300
>600
>600 >1500
>200>2300
Fig. 3.2
(4) Follow the installation distance required in the fig below to ensure sufficient space for
maintenance.
(5) The installation location should be far from heat sources, ammable or explosive gas, or smog
spread in the air.
(6) The indoor unit, outdoor unit, power cord and connection electricity wire should be at least
1m from television and radio in order to prevent interference and noise. (Even though 1m
distance is ensured, there may be noise if the electric wave is too strong.)
Notes:
① The unit shall be installed in accordance with national standards or local regulations.
② Only qualified personnel can carry out installation work, please contact with local dealer
before installation.
③ Make sure all the installation work completed before energizing.
3.3 Requirements of Communication Wire Selection
Note:
If air conditioner used under strong electronic-magnetic interference circumstance, STP(shielded
twisted pair) communication cable must be adopted.
3.3.1 Select communication line for indoor unit and wired controller
L=L01+L02+L1+L2+......+L(n-1)(n≤16)
L1
L01L02
Sub-master
Controller
Master
Controller
Indoor Unit 1 Indoor Unit 2 Indoor Unit 3 Indoor Unit n
L2 L(n-1)
Fig 3.3.1
Wire Type Total Length of
Communication Line L(m) Wire Gauge (mm2) Wire Standard Remark
Light/Common PVC
Jacket Soft Wire L≤250 2×0.75~2×1.25 IEC 60227-5
The total length of
communication line
should not exceed 250m
3.3.2 Selection of communication wire between Indoor Unit and Indoor Unit
(Outdoor Unit )

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
7
Outdoor
unit1
Outdoor
unit 2
Outdoor
unit 3
Outdoor
unit 4
Indoor Unit 1 Indoor Unit 2 Indoor Unit n
LO1
L=LO1+LO2+LO3+Li1+Li2+.......+Lin(n≤80)
LO2 LO3 Lin
Fig 3.3.2
Wire Type
Total Length of
ommunication
Line L(m)
Wire Gauge (mm2) Wire Standard Remark
Light/Common PVC
Jacket Soft Wire L≤1000 ≥2×0.75 IEC 60227-5
If wire gauge is 2X1 mm2, then
it’s OK to increase the length of
communication line. But total
length should not exceed 1500m.
3.4 Wiring Requirements
Dimension of power cord and capacity of air switch
Models: Power specication Air Switch
Capacity (A)
Minimum Sectional
Area of Grounding
Wire(mm2)
Minimum Sectional
Area of Power Cord
(mm2)
GMV-ND28ZD/A-T
220~240V-1ph-50Hz
208~230V-1ph-60Hz
6 1 1
GMV-ND36ZD/A-T 6 1 1
GMV-ND50ZD/A-T 6 1 1
GMV-ND63ZD/A-T 6 1 1
GMV-ND71ZD/A-T 6 1 1
GMV-ND90ZD/A-T 6 1 1
GMV-ND112ZD/A-T 6 1 1
GMV-ND125ZD/A-T 6 1 1
GMV-ND140ZD/A-T 6 1 1
Notes:
① The circuit breaker and power cord specification in above sheet are based on max power
(max current) of the unit.
② The power cord specication in above sheet is based on ambient temperature of 40°C.
③ The circuit breaker specication in above sheet is based on ambient temperature of 40°C.
If the working condition is different, please adjust it according to the specification sheet of circuit
breaker.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
8
4 Installation Instructions
4.1 Installation of Indoor Unit
4.1.1 Outline Dimension and Installation Spots
C
A
HD
B
Fig 4.1.1
Below are dimensions of A, B, C, etc. for different models:
Unit: mm
Models: A B C D H
Drainage Pipe(Outer
Diameter × wall
thickness)
Outer Diameter of
Connection Pipe
Liquid pipe Gas pipe
GMV-ND28ZD/A-T 1220 225 1158 280 700
φ17×1.75
6.35 9.52
GMV-ND36ZD/A-T
GMV-ND50ZD/A-T 1220 225 1158 280 700 6.35 12.7
GMV-ND63ZD/A-T
GMV-ND71ZD/A-T
GMV-ND90ZD/A-T
1420 245 1354 280 700 9.52 15.9
GMV-ND112ZD/A-T
GMV-ND125ZD/A-T
GMV-ND140ZD/A-T
1700 245 1634 280 700 9.52 15.9
Important: The drilling work and installation of unit must be carried out by qualied personnel.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
9
4.1.2 Suspend Indoor Unit
(1) Determine the location of the hanger through the paper pattern for installation, and then
remove the paper pattern, as shown in the left g of Fig 4.1.2.1.
Paper template
Anchor bolt
Fig 4.1.2.1
(2) Insert the expansion bolts into the drilled holes, and drive the iron nail into the bolt with a
hammer, as shown in the right g of Fig 4.1.2.1.
(3) Remove the right and left side panels, as shown in Fig 4.1.2.2.
(4) Put the hanger bolt into the clasp of the indoor unit and then tighten the bolt on the hanger to
prevent the indoor unit from moving, as shown in Fig 4.1.2.2.
◆ Floor type
Wall
Left side panel
Right side panel
Paper template
Fig 4.1.2.2
(5) Reinstall and tighten the right and left side panels, as shown in Fig 4.1.2.3.
(6) Adjust the height of the unit to make the drainage pipe slant slightly downward so that the
water will drain out smoothly, as shown in Fig 4.1.2.3
◆ Ceiling type

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
10
40
Ceiling
Suspension
bolt
Spring
washer
Nut
Nut
Hanger
Right side
panel
Left side panel
Fig 4.1.2.3
4.1.3 Leveling
The water level test must be done after installing the indoor unit to make sure that the unit is
horizontal, as shown below.
Note: Adjust the height of the unit to make the drainage pipe slant slightly downward so that
the water will drain out smoothly.
Horizontal tester
Fig 4.1.3
4.2 Refrigerant Pipe Connection
(1) Aim the aring port of copper pipe at the center of screwed joint and then tighten the aring
nut with hand as shown in Fig 4.2.
(2) Use a torque wrench to tighten up the aring nut until the wrench gives out a click sound.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
11
pipe joint of indoor unit
wrench torque wrench
flaring nut pipe joint
Torque for tightening nut
Pipe diameter (mm) Torque (N·m)
Ф6.35 15~30
Ф9.52 35~40
Ф12.7 45~50
Ф15.9 60~65
Fig.4.2
(3) The pipe should not be bent too much or it may crack. Use a pipe bender when bending the
pipe.
(4) Wrap the connection pipe and joint with sponge and then tie them rmly with tape.
4.3 Drainage Pipe Installation and Drainage System Testing
4.3.1 Notice for Installation of Drainage 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 g 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 hose and wire binder.
Never connect the drainage hole and drainage hose with glue.
(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.
additional drainage pipe
insulating
pipe insulating tape
drainage pipe
of indoor unit
Fig 4.3.1.1
(6) Connect the drainage pipe properly, as shown in Fig 4.3.1.2.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
12
Drain hose must
slope downward.
Allow no trap to
form in the piping
Do not allow end
of hose to touch
water
Fig 4.3.1.2
4.3.2 Installation of Drainage pipe
(1) Drainage pipe should have the same diameter or larger diameter than the connection pipes
(PVC pipe, outside diameter 17mm, thickness≥1.75mm).
(2) Keep drainage pipe short and sloping downwards at a gradient of at least 1% for preventing
forming air bubbles.
(3) Insert the drainage hose into drain socket and then tighten the metal clamp securely.
(4) Warp the sealing pad over drainage hose and metal clamp for heat insulation.
(5) Make sure to perform insulation work for all drainage hoses in the room in order to prevent
any possible water dropping due to dew condensation.
(6) Apply the suitable diameter for converging drainage pipe according to the operating capacity
of the unit, as show in Fig 4.3.2.1.
≥100mm
1
≥100mm
Fig 4.3.2.1
①- Drainage pipes assembled by T-shaped joints

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
13
(7) The horizontal pipe can’t be connected to vertical pipe in the same level; please select the
connection way as shown in following g.
N01: Three-way connection of drainage pipe joints (Fig 4.3.2.2)
NO2: Connection of downspout elbow (Fig 4.3.2.3)
NO3: Inserting horizontal pipe connection (Fig 4.3.2.4)
Connection of
drainage pipe joints
Connection of
downspout elbow
Inserting pipe connection
Fig 4.3.2.2 Fig 4.3.2.3 Fig 4.3.2.4
(8) Drainage 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.
1000-1500mm
Fig 4.3.2.5
(9) Prepare the local piping at the connection point for the drainage pipe, as shown in Fig 4.3.2.6.
Drain pan
Drain hose
①Right side piping ②Bottom-right piping
Fig 4.3.2.6
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is nished.
Inject approximately 1L puried water to drain pan from air vent; pay attention not to splash the
water over the electrical components (e.g. water pump. etc.):
(2) During the test, please carefully check the drainage joint and make sure no any leakage
occur.
(3) It’s strongly recommended to do the drain test before ceiling decoration.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
14
Ceiling type
Floor type
Fig 4.3.3
4.4 Installation of Wired Controller
Wired controller is optional accessory. If wired controller is needed, please contact your local
dealer and install the wired controller according to the instruction manual.
Note:
Do perform the commissioning operation before rst use; automatic addressing or other settings,
please refer to the manual of ODU.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
15
5 Wiring Work
Notes:
① Units must be grounded securely, or it may cause electric shock.
② Please carefully read the nameplate and the wiring diagram before carry out the wiring work,
incorrect wiring could cause malfunction or even damage the unit.
③ The capacity of power supply must be sufcient and the sectional area of wires in the room
should be above 2.5mm2.
④ The unit should be powered by independent circuit and specic socket.
⑤ The wiring should be in accordance with related regulations in order to ensure the units
operate reliably.
⑥ Install circuit breaker for branch circuit according to related regulations and electrical
standards.
⑦ All wiring must use pressure terminal or single wire. Multi-twisted wire that connects directly
to the wiring board may cause re hazard.
⑧ Keep cable away from refrigerant piping, compressor and fan motor.
⑨ Do not alter the inner wires of air conditioner. Manufacturer does not assume responsibility
for damage or abnormal operation due to this reason.
⑩ If the unit is installed in places with strong electromagnetic interference, it's recommended
to use twin-twisted shield wire. During wire connection, please pay attention that the metal shield
layer of the twin-twisted wire must be grounded(outer case) in order to prevent the unit from
electromagnetic interference.
11
The communication wires should be separated from power cord and connection wire between
indoor unit and outdoor unit.
12
If the project needs higher static pressure, you can set it through the wired controller.
13
The appliance must be fitted with means for disconnection from the supply mains having a
contact separation in all poles that provide full disconnection under overvoltage category III conditions,
and these means must be incorporated in the xed wiring in accordance with the wiring rules.
5.1 Connection of Wire and Patch Board Terminal
(1) Connection of single branch wire (as shown in Fig 5.1.1)
1) Use a stripper to strip away about 25mm of the insulation layer at the end of single branch line
so that the single-core wire can be exposed.
2) Remove the wiring screws on the patch board.
3) Shape the tail of wire into ring by needle nose plier, and keep the gauge of ring in accordance
with screw.
4) Lead the screw across the circle of the single branch line and x it on the wiring board.
single branch wire
insulation layer insulation layer
multiple twisted wires
wiring terminal
Fig 5.1.1 Fig 5.1.2
(2) Connection of multi-twisted wire (as shown in Fig 5.1.2)
1) Use a wired stripper to strip away about 10mm of the insulation layer at the end of multi-

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
16
twisted wire.
2) Loosen the wiring screws on patch board.
3) Use a round terminal fastener or a plier to securely fasten the round terminal with each core
wire of the multi-core wire.
4) Conrm the position of each core wire on the round terminal and then use a screwdriver to
tighten the terminal screw.
5.2 Power Cord Connection
Note:
① All indoor units must be unied of power supply so that they can be powered ON/OFF at the
same time.
② If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
similarly qualied persons in order to avoid a hazard.
power supply
Outdoor unit
Indoor
unit 1 Indoor unit 2 Indoor unit n
connection
wire (match
with resistance)
Wired Controller Wired Controller Wired Controller
Note: indoor unit quantity n is according to the outdoor unit capacity.
Wiring board of power XT1
Wiring board of
communication XT2
Wiring board of power XT1
Wiring board of
communication XT2
Wiring board of power XT1
Wiring board of
communication XT2
QF
L
N
QF
PE
QF
PE
QF
PE
Fig 5.2
●For units with single-phase power supply.
(1) Detach the electric box cover.
(2) Let the power cord pass through the wiring through-holes.
(3) Connect the power cord to terminal "L, N, ".
(4) Fix the power card with wiring clamp.
5.3 Connection of Communication Wire between Indoor Unit and Outdoor
Unit(or indoor unit)
(1) Detach the electric box cover.
(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 Fig 5.3.1.
wiring screw terminal board
1
D1
D1 D2 H1 H2
D2 H1 H2
IDU PCB
indoor unit
previous IDU match resistance
for communication
communication
interface CN12
Fig 5.3.1 Fig 5.3.2

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
17
(4) Fix the communication cable with clamp of electric box.
(5) In order to ensure the reliability of communication between IDU and ODU and the communication
among each IDU, add a matched resistance(supplied in a package before ex-factory) on the
wiring board of the last indoor unit in a series connection. The matched resistance should be
connected in parallel between terminal screw D1 and D2, as shown in Fig 5.3.2.
5.4 Connection of Communication Wire for Wired Controller
(1) Detach the electric box cover.
(2) Let the communication wire pass through the wiring through-holes.
(3) Connect the communication wire to terminal H1 and H2 of indoor 4-bit wiring board.
(4) Fix the communication wire with clamp.
(5) Wiring instructions of signal receiver and wired controller.
Electric Box Cover
Left Cover Plate
Fig 5.4.1
(6) Both IDU and wired controller are equipped with signal receiver, and available for remote control
respectively. (Fig 5.4.2)
Fig 5.4.2
5.5 Wiring Instructions 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
Fig 5.5)