Gree GMV-ND22T/B-T User manual

Owner's Manual
Air Conditioners
Models:
GMV-ND22T/B-T
GMV-ND28T/B-T
GMV-ND36T/B-T
GMV-ND45T/B-T
GMV-ND50T/B-T
GMV-ND56T/B-T
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 final right to interpret this manual.
Multi Variable Air Conditioners
Compact Cassette Type Indoor Unit

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.
(8) These instructions shall also be available in an alternative format, e.g. on a website.
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 instrction 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..............................................................................................................3
2.1 Names of Key Components.........................................................................................3
2.2 Rated Working Condition.............................................................................................3
2.3 Unit Functions .............................................................................................................3
3 Preparations for Installation...................................................................................................4
3.1 Standard Fittings..........................................................................................................4
3.2 Installation Position Selection......................................................................................4
3.3 Requirements of communication wire selection ..........................................................5
3.4 Wiring Requirements...................................................................................................6
4 Installation Instructions..........................................................................................................7
4.1 Indoor unit installation..................................................................................................7
4.2 Refrigerant Pipe Connection .......................................................................................9
4.3 Drainage Pipe Installation and Drainage System Testing..........................................10
4.4 Panel installation .......................................................................................................12
4.5 Installation of Wired Controller ..................................................................................14
5 Wiring Work.........................................................................................................................14
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...................................................................................19
8 Troubleshooting...................................................................................................................20

Multi Variable Air Conditioners Cassette Type Indoor Unit
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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
according to
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.
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.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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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.)
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 GREE
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
GREE service center and
have it repaired by
professional technicians.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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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
Fig 2.1
No.
①
②
③
④
⑤
Name
the hanger
bracket
Drainage Pipe
Louver
Connection
Pipe
Air Inlet Grille
(With Filter)
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
XK46(Standard)
Wired Controller
XK49(Optional)
Remote Controller
YAP1F (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

Multi Variable Air Conditioners Cassette Type Indoor Unit
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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 Preparations for Installation
Note: this picture is for reference only, please refer to the actual product; the unit of dimension
is mm.
3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No.
Name
Appearance
Q'ty
Usage
1
Drainage hose assembly
1
To connect the drainage pipe
2
Special Nut
1
To be used for connecting the
refrigerant pipe
3
Insulation
1
To insulate the gas pipe
4
Insulation
1
To insulate the liquid pipe
5
Sponge
2
To insulate the drain pipe
6
Fastener
4
To fasten the sponge
7
paper pattern for
installation
1
Locate the drill hole on ceiling
8
Tapping screw with
washer
4
Fix paper pattern
9
Remote controller
1+2
To control the indoor unit
10
Washer fixing plate
4
Prevent the washer from falling
off
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.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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(3) There should be no obstruction near air inlet and air outlet.
(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, flammable or explosive gas, or
smog spread in the air..
(6) The appliance shall not be installed in the laundry.
(7) Appliances are not accessible to general public.
(8) 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.)
Unit: mm
Fig 3.2
Notes:
①The unit shall be installed in accordance with national standards or local regulations.
②Only qualified personnel can carry out installation work, please contact with local dealer before
installation..
③Make 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 Selection of communication wire between indoor unit and wired controller
Fig 3.3.1

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Wire type
Total length of
communication wire between
indoor unit and wired
controller (m)
Wire diameter
(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 cable 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 Selection of communication wire between indoor unit and indoor unit (or 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)
Wire standard
Remark
Light/Ordinary
polyvinyl
chloride
sheathed
cord.(60227
IEC 52 /60227
IEC 53) (60227
IEC 52
/60227 IEC 53)
L≤1000
≥2×0.75
IIEC
60227-5:2007
1.If the wire diameter is
enlarged to 2 ×1 mm2, the
total communication cable
length can reach 1500m.
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.
3.4 Wiring Requirements
(1) Dimension of power cord and capacity of air switch
Notes:
①The circuit breaker and power cord specification in above sheet are based on max power (max
current) of the unit.
②The power cord specification in above sheet is based on ambient temperature of 40°C.
③The circuit breaker specification in above sheet is based on ambient temperature of 40°C.
④If the working condition is different, please adjust it according to the specification sheet of

Multi Variable Air Conditioners Cassette Type Indoor Unit
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circuit breaker.
Model
Power Supply
Air Switch
Capacity (A)
Minimum
Sectional Area of
Grounding
Wire(mm2)
Minimum
Sectional Area
of Power Cord
(mm2)
GMV-ND22T/B-T
220~240V-1ph-50Hz
208~230V-1ph-60Hz
6
1
1
GMV-ND28T/B-T
6
1
1
GMV-ND36T/B-T
6
1
1
GMV-ND45T/B-T
6
1
1
GMV-ND50T/B-T
6
1
1
GMV-ND56T/B-T
6
1
1
4 Installation Instructions
4.1 Indoor unit installation
4.1.1 Indoor unit dimension and suspension bolt position
Fig 4.1.1
Below are dimensions of A, B, C, etc. for different models: Unit: mm/inch
Model
A (mm)
B (mm)
C (mm)
D (mm)
E (mm)
F (mm)
Drainage
Pipe(Outer
Diameter×wall
thickness) (mm)
Outer Diameter of
Connection
Pipe(mm)
Liquid
pipe
Gas pipe
GMV-ND22T/B-T
670
596
592
571
145
240
φ25×2.5
6.35
9.52
GMV-ND28T/B-T
6.35
9.52
GMV-ND36T/B-T
6.35
12.7
GMV-ND45T/B-T
6.35
12.7
GMV-ND50T/B-T
6.35
12.7
GMV-ND56T/B-T
9.52
15.9
Important: The drilling work and installation of unit must be carried out by qualified personnel.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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4.1.2 Suspend the indoor unit
(1) Drill bolt holes and install bolts
1) Stick the paper pattern on the installation position; drill 4 holes according to the hole site
on the cardboard as shown in fig 4.1.2; diameter of drilling hole is according to the
diameter of expansion bolt and the depth is 60-70mm, as shown in fig 4.1.3.
Fig 4.1.2 Fig 4.1.3
2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as
shown in fig 4.1.4.
Note!
The length of bolt depends on the installation height of the unit, bolts are field supplied.
Fig 4.1.4
(2) Install the indoor unit temporarily
Assemble suspension bolt on the expansion bolt, attach the hanger bracket to the suspension
bolt. Be sure to fix it securely by using a nut and washer from upper and lower sides of the hanger
bracket. The washer fixing plate will prevent the washer from falling.
(3) The usage of paper pattern
Refer to paper pattern of installation for ceiling opening dimension. The center of ceiling
opening is indicated on the paper pattern. Fix the paper pattern to the unit with 4 screws and fix
the corners of the waterspout at the drainage pipe by screws.
(4) Adjust the unit to the right position.
(5) Check the level of the unit.The indoor unit is equipped with build-in water pump and float
switch, verify the levelness of 4 directions by level gauge or vinyl tube (filled with water)
respectively.
(6) Remove the washer locating plate and then tighten the nut on it.
(7) Remove the paper pattern.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Fig 4.1.5
4.2 Refrigerant Pipe Connection
(1) Aim the flaring port of copper pipe at the center of screwed joint and then tighten the
flaring nut with hand as shown in fig 4.2.
(2) Use a torque wrench to tighten up the flaring nut until the wrench gives out a click sound.
Fig.4.2
Torque for tightening nut
Pipe diameter (mm)
Torque (N·m)
φ6.35
15~30
φ9.52
35~40
Φ12.7
45~50
φ15.9
60~65
(3) The pipe should not be bent too much or it may crack. Use a pipe bender when bending
the pipe.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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(4) Wrap the connection pipe and joint with sponge and then tie them firmly 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 fig 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 hole 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(4 inch) lower than the drainage port of each unit. In this case, thicker
pipes should be applied.
Fig 4.3.1
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 25mm, thickness≥1.5mm).
(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.
Fig 4.3.2

Multi Variable Air Conditioners Cassette Type Indoor Unit
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①-Drainage pipes assembled by T-shaped joints
(7) The horizontal pipe can’t be connected to vertical pipe in the same level; please select the
connection way as shown in following fig.
NO1: 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)
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.
Fig 4.3.4
(9) The installation height of raising pipe for drainage should be lower than 850mm. The
gradient from raising pipe towards drainage direction should be at least 1%~2%. If the
raising pipe is vertical with the unit, the raising height should be less than 800mm., as
shown in Fig 4.3.2.6.
model
A(mm)
B(mm)
GMV-ND22T/B-T
GMV-ND28T/B-T
GMV-ND36T/B-T
GMV-ND45T/B-T
GMV-ND50T/B-T
GMV-ND56T/B-T
170
830
Fig 4.3.6
(10) If the raising pipe is vertical with the unit, the distance between raising pipe and unit

Multi Variable Air Conditioners Cassette Type Indoor Unit
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should be less than 300mm.
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is finished.
Inject approximately 1L purified water to drain pan from air vent, ensure that not to splash the
water over the electrical components (e.g. water pump. etc).
1) In case of commissioning finished, please energize the IDUs and switch to cooling or dry
mode, meanwhile, the water pump operates, you can check the draining through the
drain socket.
2) If communication wire is not connected, communication malfunction “C0” will occur after
60s of energizing. In this case, the water pump operates automatically. Check if the
water pump drains normally through drainage port. The water pump will stop
automatically after running for 10mins.
(2) During the test, please carefully check the drainage joint, make sure no any leakage
occur.
(3) It’s strongly recommend to do the drain test before ceiling decoration.
Fig 4.3.5
4.4 Panel installation
4.4.1 Notices for installation
(1) Improper decorative panel installation could cause the following problems.
Fig 4.4.1
(2) Ensure that its clearance-free between decoration panel and ceiling board after
installation, if not, please adjust the body position.
Fig 4.4.2

Multi Variable Air Conditioners Cassette Type Indoor Unit
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(3) Connect the decoration panel terminals (Female) to body terminals (male) as shown in
figure4.4.3.
Fig 4.4.3
4.4.2 Panel installation
(1) Detach the panel’s Corner Cap, there is a mark “piping side” on one of the 4 corners,
adjust the panel direction so as to keep the mark and fittings on the same corner , as
shown in fig4.4.4
Fig 4.4.4
(2) Temporality hang the panel to body (there is four hangers on each corner of the panel,
hang the hangers to corresponding hooks on the body), as shown in fig 4.4.5.
(3) Detach the air inlet grille from panel, make a wiring connection of signal receiver. Notices
that the connection wire not stuck in the middle of body and panel, or may cause air
leakage and lead to condensation water drop.
(4) Tighten 4 screws at each corner of panel respectively, fix the panel on the body firmly.
(5) After tightening screws, reinstall the air inlet grille.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Fig 4.4.5
4.5 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 first use; automatic addressing or other
settings, please refer to the manual of ODU.
5 Wiring Work
Note!
Units must be grounded securely, or it may cause electric shock.
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.
The capacity of power supply must be sufficient and the sectional area of wires in the
room should be above 2.5mm2.
The unit should be powered by independent circuit and specific socket.
The wiring should be in accordance with related regulations in order to ensure the units
operate reliably.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Install circuit breaker for branch circuit according to related regulations and electrical
standards.
All wiring must use pressure terminal or single wire. Multi-twisted wire that connects
directly to the wiring board may cause fire hazard.
Keep cable away from refrigerant piping, compressor and fan motor.
Do not alter the inner wires of air conditioner. Manufacturer does not assume
responsibility for damage or abnormal operation due to this reason.
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.
The communication wires should be separated from power cord and connection wire
between indoor unit and outdoor unit.
If the project needs higher static pressure, you can set it through the wired controller.

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 fixed 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 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) Lead the screw across the circle of the single branch line and fix it on the wiring board.
(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-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) Confirm the position of each core wire on the round terminal and then use a screwdriver
to tighten the terminal screw.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Fig 5.1.1 Fig 5.1.2
5.2 Power Cord Connection
Note!
①All indoor units must be unified of power supply so that they can be powered ON/OFF at the
same time.
②If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
similarly qualified persons in order to avoid a hazard.
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 Fig5.3.1.
Fig 5.3.1 Fig 5.3.2
(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..

Multi Variable Air Conditioners Cassette Type Indoor Unit
17
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.
1) Wired controller (standard) is shown as Fig.5.4.1,wireless controller (optional) is shown
as Fig.5.4.2,signal receiver is provided with panel as standard accessory.
Fig 5.4.1 Fig 5.4.2
2) Both IDU and wired controller are equipped with signal receiver, and available for
wireless control respectively.
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 Fig5.5) top using it immediately and contact local service center for assistance.