Gree GMV-ND07T/B-T User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
Compact Cassette Type Indoor Unit
Models:
GMV-ND07T/B-T(U)
GMV-ND09T/B-T(U)
GMV-ND12T/B-T(U)
GMV-ND15T/B-T(U)
GMV-ND18T/B-T(U)

Preface
For correct installation and operation, please read all instructions carefully. Before reading the
instructions, please be aware of the following items:
This is the safety alert symbol. It is used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.
This mark indicates procedures which, if improperly performed, might lead to
the death or serious injury of the user.
This mark indicates procedures which, if improperly performed, might
possibly result in personal harm to the user, or damage to property.
NOTICE is used to address practices not related to personal injury.
(1) Instructions for installation and use of this product are provided by the manufacturer.
(2) Installation must be performed in accordance with the requirements of NEC and CEC by
authorized personnel only.
(3) For the safe operation of this unit, please read and follow the instructions carefully.
(4) 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.
(5) Direct operators or maintainers should well keep this manual.
(6) If this unit fails to operate normally, please contact our service center as soon as possible and
provide the following information:
1) Content on the nameplate (model number, cooling capacity, production code, ex-factory
date.)
2) Malfunction details (before and after the malfunction occurs.)
(7) 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.
(8) Installation must be performed in accordance with the requirements of NEC and CEC by
authorized personnel only.
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: Do not dispose this product as unsorted municipal waste. Collection of such
waste separately for special treatment is necessary.

Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss is caused by th
e
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 Precautions..................................................................................................... 1
2 Product Introduction ................................................................................................. 2
2.1 Names of Key Components.............................................................................................. 2
2.2 Rated Working Condition.................................................................................................. 2
3 Preparations for Installation ..................................................................................... 2
3.1 Standard Fittings............................................................................................................... 2
3.2 Installation Position Selection ........................................................................................... 3
3.3 Requirements for Communication Line............................................................................. 4
3.4 Wiring Requirement.......................................................................................................... 5
4 Installation Instructions ............................................................................................ 6
4.1 Installation of Indoor Unit.................................................................................................. 6
4.2 Refrigerant Pipe Connection............................................................................................. 8
4.3 Drainage Pipe Installation and Drainage System Testing.................................................. 9
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...................................................................................................15
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or Indoor Unit)
..............................................................................................................................................16
5.4 Connect Communication Wire of Wired Controller...........................................................16
5.5 Illuminate for Connection 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 Compact Cassette Type Indoor Unit
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1 Safety Precautions
(1) 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.
(2) Follow this instruction to complete the installation work. Please carefully read this manual
before unit startup and service.
(3) Wire size of power cord should be large enough. The damaged power cord and connection
wire should be replaced by exclusive cable.
(4) After connecting the power cord, please fix the electric box cover properly in order to avoid
accident.
(5) Never fail to comply with the nitrogen charge requirements. Charge nitrogen when welding
pipes.
(6) Never conditioners short-circuit or cancel the pressure switch to prevent unit damage.
(7) Please firstly connect the wired controller before energization, otherwise wired controller
cannot be used.
(8) Before using the unit, please check if the piping and wiring are correct to avoid water leakage,
refrigerant leakage, electric shock, or fire etc.
(9) Do not insert fingers or objects into air outlet/inlet grille.
(10)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.
(11)Never start up or shut off the air conditioner by means of directly plug or unplug the power
cord.
(12)Turn off the unit after it runs at least five minutes; otherwise it will influence oil return of the
compressor.
(13)Do not allow children operate this unit.
(14)Do not operate this unit with wet hands.
(15)Turn off the unit or cut off the power supply before cleaning the unit, otherwise electric shock or
injury may happen.
(16)Never spray or flush water towards unit, otherwise malfunction or electric shock may happen.
(17)Do not expose the unit to the moist or corrosive circumstances.
(18)Under cooling mode, please don't set the room temperature too low and keep the temperature
difference between indoor and outdoor unit within 5°C(41°F).
(19)User is not allowed to repair the unit. Fault service may cause electric shock or fire accidents.
Please contact Gree appointed service center for help.
(20)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.
(21)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..
(22)The control box should be installed inside.
(23)Be sure to use the exclusive accessory and part to prevent the water leakage, electric shock
and fire accidents.
(24)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.
(25)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).
(26)If refrigerant leakage happens during installation, please ventilate immediately. Poisonous gas
will emerge if the refrigerant gas meets fire.
(27)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.
(28)If anything abnormal happens (such as burning smell), please power off the unit and cut off the
main power supply, and then immediately contact Gree appointed service center. If
abnormality keeps going, the unit might be damaged and lead to electric shock or fire.

Multi Variable Air Conditioners Compact 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.2.1.1
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
°C (°F)
Wet Bulb Temp
°C(°F)
Dry Bulb Temp
°C(°F)
Wet Bulb Temp
°C(°F)
Rated Cooling
26.7(80)
19.4(67)
35(95)
24(75)
Rated Heating
21.1(70)
15.6(60)
8.3(47)
7.1(45)
3 Preparations for Installation
Product graphics are only for reference. Please refer to actual products. Unspecified
measure unit is mm (inch).
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 2 GMV-ND07~15T/B-T(U)
1GMV-ND18T/B-T(U)
3
Corrugated pipe
1
GMV-ND18T/B-T(U)
4
Insulation
1
To insulate the gas pipe
5
Insulation
1
To insulate the liquid pipe

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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No.
Name
Appearance
Q'ty
Usage
6 Sponge 2 To insulate the drain pipe
7
Fastener
4
To fasten the sponge
8
Paper pattern for
installation
1
Locate the drill hole on
ceiling
9
Tapping screw with
washer
4 Fix paper pattern
10 Remote controller 1+2 To control the indoor unit
11 Washer fixing plate 4
Prevent the washer from
falling off
12 Remote controller
holder 1 Used for holding the
remote controller
13 Tapping screw 2
Used for fixing the remote
controller holder
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.
(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 (3-1/4ft.) from television and radio in order to prevent interference and noise. (Even
though 1m (3-1/4ft.) distance is ensured, there may be noise if the electric wave is too
strong.)
Unit: mm (inch)
Fig.3.2.1

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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Unit: mm (inch)
Model
H
GMV-ND07~18T/B-T(U)
255(10)
(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 for Communication Line
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
Fig.3.3.1
Material type
Total length of
communication
line between
indoor unit and
wired controller L
(m/ft.)
Wire size
(mm2/AWG)Material standard Remarks
Light/Ordinary
polyvinyl
chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤250
(L≤820-3/16)
2×0.75
~2×1.25
(2×AWG18
~2×AWG16)
IEC
60227-5
1.Total length of communication
line can't exceed 250m (820ft).
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

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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Material Type
Total Length L
(m/ft.) of
Communication
Cable between
Indoor Unit and
Indoor (Outdoor)
Wire size
(mm2/AWG) Material standard Remarks
Light/Ordinary
polyvinyl
chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000
(L≤3280-13/16) ≥2×0.75 (≥2×AWG18) IEC 60227-5
1.If the wire diameter is enlarged
to 2×1 mm² (2×AWG16), the
total communication line length
can reach 1500m (4920ft).
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 Requirement
Power Cord Size and Air Switch Capacity
Model
Power Supply
MCA(A)
MOP(A)
GMV-ND07T/B-T(U)
208/230V-1ph-60Hz
2 15
GMV-ND09T/B-T(U) 2 15
GMV-ND12T/B-T(U) 2 15
GMV-ND15T/B-T(U) 2 15
GMV-ND18T/B-T(U) 2 15
(1) An all-pole disconnection switch having a contact separation of at least 3mm (1/8 inch) in all
poles should be connected in fixed wiring.
(2) The circuit breaker and power cord specification in above sheet are based on max power (max
current) of the unit.
(3) The power cord specification in above sheet is based on ambient temperature of 40°C (104°F).
(4) The circuit breaker specification in above sheet is based on ambient temperature of 40°C
(104°F). If the working condition is different, please adjust it according to the specification sheet
of circuit breaker.

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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4 Installation Instructions
4.1 Installation of Indoor Unit
4.1.1 Ceiling opening Dimension and suspension bolt position.
Fig.4.1.1
Unit: mm (inch)
Model
A
B
C
D
E
GMV-ND07T/B-T(U)
GMV-ND09T/B-T(U)
GMV-ND12T/B-T(U)
GMV-ND15T/B-T(U)
GMV-ND18T/B-T(U)
670
(26 3/8) 570 (22 7/16) 570 (22 7/16) 495 (19 1/2) 600 (23 5/8)
4.1.2 Suspend the Indoor Unit
(1) Drill bolt holes and install bolts
1) Stick the reference cardboard 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 (2-3/8~2-3/4 inch), as shown in
fig.4.1.3.

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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Unit: mm (inch)
Fig.4.1.2Fig.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.
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 Compact 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. 4.2.1.
(2) Use a torque wrench to tighten up the flaring nut until the wrench gives out a click sound.
Fig.4.2.1
Pipe diameter
mm( inch)
Torque(N•m)
6.35(1/4) 15~30
9.52(3/8) 35~40
12.7(1/2) 45~50
15.9(5/8) 60~65

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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(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 firmly with tape.
4.3 Drainage Pipe Installation and Drainage System Testing
4.3.1 Notice for Installation of Drain Pipe
(1) It is not allowed to connect the condensate drain pipe into waste pipe or other pipelines
which are likely to produce corrosive or peculiar smell to prevent the smell from entering
indoors or corrupt the unit.
(2) It is not allowed to connect the condensate drain pipe into rain pipe to prevent rain water
from pouring in and cause property loss or personal injury.
(3) Condensate drain pipe should be connected into special drain system for air conditioner.
(4) The drainage pipe should be short and the gradient downwards should be at least 1%~2% in
order to drain condensation water smoothly.
(5) The diameter of drainage hose should be bigger or equal to the diameter of drainage pipe
joint.
(6) Install drainage pipe according to the following Fig.4.3.1 and arrange insulation to the
drainage pipe. Improper installation may lead to water leakage and damp the furniture and
other things in the room.
(7) 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.
Can’t connect the drainage hole and drainage hole with glue.
(8) 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 Drainage Pipe Installation
(1) Drainage pipe should have the same diameter or larger diameter than the connecting pipes
(PVC pipe, outside diameter 25mm (1 inch), thickness≥1.5mm (1/16 inch).
(2) Keep drainage pipe short and sloping downwards at a gradient of at least 1% for preventing
forming air bubbles.
(3) If the gradient of drainage pipe could not meet the installation requirements, raising pipe
should be applied.
(4) Insert the drainage hose into drain socket, tighten the metal clamp securely.

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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(5) Warp the sealing pad over drain hose and metal clamp for heat insulation.
(6) Make sure to perform insulation work for all drainage piping in order to prevent any possible
water drop due to dew condensation.
(7) Apply the suitable diameter for converging drainage pipe according to the operating capacity
of the unit.
Unit: mm (inch)
Fig. 4.3.2
①Drainage pipes assembled by T-shaped joints
(8) The horizontal pipe can’t be connected to vertical pipe in the same level; please select the
connection way as shown in following fig.
1) Three-way connection of drainage pipe joints (Fig.4.3.3).
2) Connection of downspout elbow (Fig.4.3.4).
3) Inserting horizontal pipe connection (Fig.4.3.5).
Fig.4.3.3 Fig.4.3.4 Fig.4.3.5
(9) Drain 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 (39~3/8~59 inch).
Unit: mm (inch)
Fig.4.3.6

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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(10)The installation height of raising pipe for drainage should be lower than B. 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 C, as shown in Fig. 4.3.7.
Unit: mm (inch)
Fig.4.3.7
Unit: mm (inch)
Model
A
B
C
GMV-ND07T/B-T(U)
GMV-ND09T/B-T(U)
GMV-ND12T/B-T(U)
GMV-ND15T/B-T(U)
GMV-ND18T/B-T(U)
170(6 11/16) 1030(40 1/2) 980(38 1/2)
(11)During the installation, distance from soft drain pipe to the gasket is C when the bolt is
tightened. It is not allowed to apply PVC or other related glue in the joints of two ends of
drain pipe.
Fig.4.3.8
Unit: mm (inch)
Model
C
GMV-ND07T/B-T(U)
GMV-ND09T/B-T(U)
GMV-ND12T/B-T(U)
GMV-ND15T/B-T(U)
GMV-ND18T/B-T(U)
10±3(3/8±1/8)
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) 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.)

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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2) 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.
3) 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, and make sure no any leakage
occur.
(3) It’s strongly recommended to do the drain test before ceiling decoration.
Unit: mm (inch)
Fig.4.3.9
4.4 Panel Installation
4.4.1 Notices for Installation
(1) Improper decorative panel installation could cause the following problems.
Fig.4.4.1

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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(2) Ensure that it’s clearance-free between decoration panels and ceiling board after installation,
if not, please adjust the body position.
Fig.4.4.2
(3) Connect the decoration panel terminals (Female) to body terminals (Male) as shown in
fig.4.4.3.
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
Fig.4.4.4.
Fig.4.4.4
(2) Temporality hang the panel to body (there are 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 Compact Cassette Type Indoor Unit
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Unit: mm (inch)
Fig.4.4.5
4.5 Installation of Wired Controller
Please refer to User Manual of Wired Controller for the installation details.
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.
5 Wiring Work
WARNING
Before obtaining access to terminals, all supply circuits must be disconnected.
(1) Units must be grounded 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.

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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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.
Unit: mm (inch)
Fig.5.1.1 Fig.5.1.2
5.2 Power Cord Connection
Every unit should be equipped with a circuit breaker for short-circuit and overload
protection. In general, circuit breaker is at OFF status.
During operation, all indoor units and outdoor units belonging to the same system must be kept
energized status. Otherwise, the unit can’t operate normally.
Fig. 5.2.1
For units with single-phase power supply.
(1) Detach the electric box lid.
(2) Let the power cord pass through the wiring through-holes.

Multi Variable Air Conditioners Compact Cassette Type Indoor Unit
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(3) Connect the power cord to terminal “L1, L2,”.
(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 Fig.5.3.1.
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.
(4) Fix the communication wire with wire clip on the electric box.