Gree GMV-ND22ZA/A-T User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
Concealed Floor Standing Unit
Models:
GMV-ND22ZA/A-T GMV-ND28ZA/A-T
GMV-ND36ZA/A-T GMV-ND45ZA/A-T
GMV-ND56ZA/A-T GMV-ND63ZA/A-T
GMV-ND71ZA/A-T

To Users
Thank you for selecting Gree product. Please read this instruction manual carefully before installing
and using the product, so as to master and correctly use the product. In order to guide you to correctly
install and use our product and achieve expected operating effect, we hereby instruct as below:
(1) This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been
given supervision or instruction concerning use of the appliance in a safe way and understand
the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance
shall not be made by children without supervision.
(2) In order to ensure reliability of product, the product may consume some power under stand-by
status for maintaining normal communication of system and preheating refrigerant and lubricant.
If the product is not to be used for long, cut off the power supply; please energize and preheat
the unit in advance before reusing it.
(3) Please properly select the model according to actual using environment; otherwise it may impact
the using convenience.
(4) This product 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.
(5) If the product needs to be installed, moved or maintained, please contact our designated dealer
or local service center for professional support. Users should not disassemble or maintain the
unit by themselves, otherwise it may cause relative damage, and our company will bear no
responsibilities.
(6) All the illustrations and information in the instruction manual are only for reference. In order to
make the product better, we will continuously conduct improvement and innovation. If there is
adjustment in the product, please subject to actual product.

Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss is caused by the
following reasons:
(1) Damage the product due to improper use or misuse of the product;
(2) Alter, change, maintain or use the product with other equipment without abiding by the instruction
manual of manufacturer;
(3) After verification, the defect of product is directly caused by corrosive gas;
(4) After verification, defects are due to improper operation during transportation of product;
(5) Operate, repair, maintain the unit without abiding by instruction manual or related regulations;
(6) After verification, the problem or dispute is caused by the quality specification or performance
of parts and components that produced by other manufacturers;
(7) The damage is caused by natural calamities, bad using environment or force majeure.

Contents
1 Safety Notices (Please be sure to abide) ......................................................................1
2 Product Introduction ......................................................................................................3
2.1 Names of Key Components..................................................................................................... 3
2.2 Rated Working Condition......................................................................................................... 3
3 Preparations for Installation ..........................................................................................3
3.1 Standard Fittings ..................................................................................................................... 4
3.2 Location for Installation............................................................................................................ 4
3.3 Requirements for Communication Line ................................................................................... 6
3.4 Wiring Requirements ............................................................................................................... 7
4 Installation Instructions .................................................................................................8
4.1 Installation of Indoor Unit......................................................................................................... 8
4.2 Refrigerant Pipe Connection ................................................................................................... 9
4.3 Drainage Pipe Installation and Drainage System Testing...................................................... 10
4.4 Installation of Air Duct............................................................................................................ 12
4.5 Installation of Wired Controller .............................................................................................. 13
5 Wiring Work...................................................................................................................13
5.1 Connection of Wire and Patch Board Terminal...................................................................... 14
5.2 Power Cord Connection ........................................................................................................ 15
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or indoor unit) 15
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...........................................................................20
8 Troubleshooting............................................................................................................20

Multi Variable Air Conditioners Concealed Floor Standing Unit
1
1 Safety Notices (Please be sure to abide)
Warning: If not abide strictly, it may cause severe damage to the unit or the people.
Note: If not abide strictly, it may cause slight or medium damage to the unit or the people.
This sign indicates that the operation must be prohibited. Improper operation may cause
severe damage or death to people.
This sign indicates that the items must be observed. Improper operation may cause damage
to people or property.
WARNING!
This product can’t be installed at corrosive, inflammable or explosive environment or the place
with special requirements, such as kitchen. Otherwise, it will affect the normal operation or
shorten the service life of the unit, or even cause fire hazard or serious injury. As for above
special places, please adopt special air conditioner with anti-corrosive or anti-explosion
function.
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.

Multi Variable Air Conditioners Concealed Floor Standing Unit
2
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.
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 or
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℃.
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 Concealed Floor Standing 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.
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
th
e return and collection systems or contact the retailer where the product was
purchased. They can take this product for environmental safe recycling.
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 19 35 24
Rated Heating 20 15 7 6
3 Preparations for Installation
NOTE!
Product graphics are only for reference. Please refer to actual products. Unspecified measure unit is
mm.

Multi Variable Air Conditioners Concealed Floor Standing Unit
4
3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No.
Name
Appearance
Q'ty
Usage
1 Wired Controller 1 pc. To control the indoor unit
2 Special Nut
1
pc.or
2 pcs.
GMV-ND22～45ZA/A-T:2 pcs.
GMV-ND56～71ZA/A-T:1 pc.
3 M10×8 Nut with Washer 4 pcs. To be used together with the hanger
bolt for installing the unit.
4 M10 Nut (M10×8.4 Nut) 4 pcs. To be used together with the hanger
bolt for installing the unit.
5 M10 Washer (Spring
Washer M10×2.6)
4 pcs. To be used together with the hanger
bolt for installing the unit.
6 Insulation 1 pc. To insulate the gas pipe
7 Insulation 1 pc. To insulate the liquid pipe
8 Plastic clamp 2 pcs. To lead the wire
9 Fastener 8 pcs. To fasten the sponge
10 Supporter(120mm) 2 pcs. To fix the indoor unit
11 Resultant screw bolt 4 pcs.
Assembly parts of Supporter to fix the
indoor unit
12 Corrugated pipe
0 or 1
pc.
GMV-ND22
～
45ZA/A-T
：
0 pc.
GMV-ND56
～
71ZA/A-T
：
1 pc.
13 Filter element
1
sheet To be used the return air filter
NOTES!
①User can purchase remote controller and receiver otherwise by himself.
②The height of ex-factory supporter is 120mm. If user wants to increase or decrease unit
installation height, please purchase the supporter of different height. Other height of supporter
is 80mm, or 160mm.
③For unit accessories, please refer to the indoor unit packing list, which is subject to change
without prior notice.
3.2 Location for Installation
(1) The appliance shall not be installed in the laundry.
(2) The location should be able to withstand the weight of unit.
(3) The ground for installing unit shall not be slant apparently.
(4) Drain pipe can drain water out easily.
(5) There is no obstacle at inlet or outlet. Please ensure good air circulation.

Multi Variable Air Conditioners Concealed Floor Standing Unit
5
(6) In order to make sure the space for maintenance, when the indoor unit was concealed
installation, according to the dimension as shown in Fig.3.2.1.
(7) Installation requirements of air inlet grille is as shown in Fig.3.2.2.
(8) Pipe connection space shall be reserved around the unit, as shown in Fig.3.2.3.
(9) Keep the unit away from heating source, inflammable gas or smoke.
(10) Indoor unit, outdoor unit, power cord and electric wire should stay at least 1m from the TV set
and radio. Otherwise, these electrical appliances may have image interference and noise. (Even
if the distance is 1m, when there is strong electric wave, noise may still occur.)
Fig.3.2.1
Fig.3.2.2
Fig.3.2.3

Multi Variable Air Conditioners Concealed Floor Standing Unit
6
Below are dimensions of A, B for different models:
Unit: mm
Model A B C D E F G H
GMV-ND22~36ZA/A-T 1200 665 615 120 200 200 20 20
GMV-ND45ZA/A-T
1400 665 815 120 200 200 20 20
GMV-ND56~71ZA/A-T 1600 665 1015 120 200 200 20 20
NOTES!
①Installation of the unit must be in accordance with National Electric Codes and local regulations.
②Improper installation will affect unit’s performance, so do not install the unit by yourself. Please
contact local dealer to arrange professional technicians for the installation.
③Do not connect power until all installation work is finished.
④When it is installed in a small room, corresponding measures must be taken to prevent oxygen
deficit or asphyxia caused by excessive refrigerant leak.
⑤Default height of inlet grille is 120mm. If the supporter of 80mm or 160mm high is selected,
please change the height of inlet grille to 80mm or 160mm accordingly.
3.3 Requirements for Communication Line
CAUTION!
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)
Wire size (mm²) Material
Standard Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤250 2×0.75~2×1.25 IEC 60227-5
1) Total length of communication line
can't exceed 250m (820-1/5ft.).
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.

Multi Variable Air Conditioners Concealed Floor Standing Unit
7
3.3.2 Select Communication Line for Indoor Unit and Indoor Unit (Outdoor Unit)
Fig.3.3.2
Material Type
Total Length L (m)
of Communication
Cable between
Indoor Unit and
Indoor (Outdoor)
Unit
Wire size (mm²) Material Standard Remarks
Light/Ordinary
polyvinyl
chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000 ≥2×0.75 IEC 60227-5
1) If the wire diameter is enlarged to 2×1
mm2(2×AWG16), the total
communication line length can reach
1500 m (4921-1/4ft.).
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
Power Cord Size and Air Switch Capacity:
Model Power Cord Size
Air Switch
Capacity
(A)
Minimum Sectional
Area of Ground Wire
(mm²)
Minimum Sectional
Area of Power
Cord(mm²)
GMV-ND22ZA/A-T
220~240V-1ph-50Hz
208~230V-1ph-60Hz
6 1.0 1.0
GMV-ND28ZA/A-T 6 1.0 1.0
GMV-ND36ZA/A-T
6
1.0
1.0
GMV-ND45ZA/A-T 6 1.0 1.0
GMV-ND56ZA/A-T 6 1.0 1.0
GMV-ND63ZA/A-T 6 1.0 1.0
GMV-ND71ZA/A-T
6
1.0
1.0
NOTES!
①Use copper wire only as unit’s power cord. Operating temperature should be within its rated
value.
②If the power cord is more than 15m long, please increase properly the sectional area of power
cord to avoid overload, which may cause accident.

Multi Variable Air Conditioners Concealed Floor Standing Unit
8
③Above selection requirements: Power cord size is based on BV single-core wire (2~4pc) at
40℃ambient temperature when laying across plastic pipe. Air switch is D type and used at
40℃. If actual installation condition varies, please lower the capacity appropriately according
to the specifications of power cord and air switch provided by manufacturer.
④If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or
a similarly qualified person in order to avoid a hazard.
⑤Install cut-off device near the unit. The minimum distance between each stage of cut-off device
should be 3mm (The same for both indoor unit and outdoor unit).
4 Installation Instructions
4.1 Installation of Indoor Unit
4.1.1 Outline Dimension and Installation Spots
Fig.4.1.1
Below are dimensions of A, B, C, etc. for different models:
Unit: mm
Model A B C D E F
GMV-ND22~36ZA/A-T 700 615 120 200 665.5 837
GMV-ND45ZA/A-T 900 615 120 200 865.5 1045
GMV-ND56~71ZA/A-T
1100
615
120
200
1065.5
1236
NOTE!
The height of ex-factory supporter is 120mm. If user wants to increase or decrease unit installation
height, please purchase the supporter of different height. Other height of supporter is 80mm, or 160mm.

Multi Variable Air Conditioners Concealed Floor Standing Unit
9
4.1.2 Drill bolt holes and install bolts
(1) Drill 4 holes according to the hole on the supporter; diameter of drilling hole is according to the
diameter of expansion bolt and the depth is 60-70mm, as shown in Fig.4.1.2.
Unit: mm
Fig.4.1.2
(2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as shown in
Fig.4.1.3.
CAUTION!
The length of bolt depends on the installation height of the unit, bolts are field supplied.
Fig.4.1.3
(3) Adjust the unit to the right position.
(4) Remove the washer locating plate and then tighten the nut on it.
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) Tighten the flaring nut with torque wrench.
Fig.4.2

Multi Variable Air Conditioners Concealed Floor Standing Unit
10
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) Use pipe bend when bending the pipe and the bending angle should not be too small.
(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 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) Insert the drain hose into the drain hole and tighten it with tapes, as shown in Fig.4.3.2. Model
with water pump will be provided with drain hose, while other models please prepare the drain
hose by yourself.
(2) Tighten the pipe clamp, with the distance between screw nut and hose smaller than 4mm.

Multi Variable Air Conditioners Concealed Floor Standing Unit
11
Fig.4.3.2
(3) Use sealing plate to make the pipe clamp and hose insulated, as shown in Fig.4.3.3.
Fig.4.3.3
(4) When connecting several drain pipes, follow the instruction as indicated in Fig.4.3.4. The
gradient of the drain pipes should be at least 1%~2%. Choose the drain collecting pipe that
matches with unit capacity.
Fig.4.3.4
(5) Install the trap as shown in following Fig.4.3.5.
(6) Install one trap for each unit.
(7) Convenience for cleaning trap in the future should be considered when installing it.
Fig.4.3.5
(8) The horizontal pipe can be connected to vertical pipe in the same level; please select the
connection way as shown in following Fig.
No.1: Connection of drainage pipe joints (Fig.4.3.6)
No.2: Connection of downspout elbow (Fig.4.3.7)
No.3: Inserting pipe connection (Fig.4.3.8)

Multi Variable Air Conditioners Concealed Floor Standing Unit
12
Fig.4.3.6Fig.4.3.7 Fig.4.3.8
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is finished. Fill some water to the water tray of
indoor unit as following.
1) Connect the drain hose to the other drain connection pipe of water tray and fill about 1L water
(as shown in 4.3.9). (Remove the drain hose after finishing testing and then put on the plug
of water tray.
2) Spray 1L water on evaporator with sprayer, as shown in 4.3.10.
(2) Check if the water drains smoothly from the drain pipe and check if there is water leakage on
the connection pipe.
(3) Arrange insulation of drain hose and pipe clamp after checking the drain system.
Fig.4.3.9 Fig.4.3.10
4.4 Installation of Air Duct
The contents in this chapter is only applicable for the case that air outlet of unit shall be connected
with air duct.
CAUTION!
①There should be insulating layer on air-out duct to avoid heat loss and moisture. Adhere a nail
on the air duct and then add thermal sponge with a layer of tin. Fasten it with a nail cover and
then seal the junction with tin tapes; you can also use other materials that have good insulation
quality.

Multi Variable Air Conditioners Concealed Floor Standing Unit
13
②Each air-out duct should be fixed on a pre-made board with iron frame. The junction of air duct
should be well-sealed in order to prevent air leakage.
③The design and construction of air duct should comply with national requirements.
Please consider noise-damping and vibration damping for the design and construction of air duct.
Besides, noise source must be away from people.
Fig.4.4.1 Air Outlet
Unit: mm
Model Size of Air Outlet
A
B
C
GMV-ND22~36ZA/A-T
152
528
21
GMV-ND45ZA/A-T 152 728 21
GMV-ND56~71ZA/A-T 152 928 21
4.5 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.
5 Wiring Work
WARNING!
Before obtaining access to terminals, all supply circuits must be disconnected.
NOTES!
①Units must be earthed securely, or it may cause electric shock.
②Please carefully read the wiring diagram before carry out the wiring work, incorrect wiring could
cause malfunction or even damage the unit.
③The unit should be powered by independent circuit and specific socket.
④The wiring should be in accordance with related regulations in order to ensure the units reliable
running.
⑤Install circuit breaker for branch circuit according to related regulations and electrical standards.
⑥Keep cable away from refrigerant pipes, compressor and fan motor.
⑦The communication wires should be separated from power cord and connection wire between
indoor unit and outdoor unit.
⑧Adjust the static pressure via wired controller according to site circumstance.

Multi Variable Air Conditioners Concealed Floor Standing Unit
14
⑨Engineering wire should be trussed together with wire-cross rubber ring in the wire-cross hole,
and be clipped into the plastic clamp.
Fig.5.0.1
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 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 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
Fig.5.1.1 Fig.5.1.2

Multi Variable Air Conditioners Concealed Floor Standing Unit
15
5.2 Power Cord Connection
WARNING!
①Every unit should be equipped with a circuit breaker for short-circuit and overload protection.
②During operation, all indoor units connected to the same outdoor unit system must be kept
energized status. Otherwise, the unit can’t operate normally.
Fig.5.2
(1) Detach the electric box lid.
(2) Let the power cord pass through the wiring through-holes.
(3) Connect wires according to Fig. 5.2.
(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.

Multi Variable Air Conditioners Concealed Floor Standing Unit
16
Fig.5.3.1
(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.
Fig.5.3.2
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.
(5) Wiring instructions of remote receiving light board and wired controller:
1) Fig.5.4.1 shows the installation of wired control
Fig.5.4.1 Fig.5.4.2