Alpic Air ACMI-28VRDC1A User manual

Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.
Multi Variable Air Conditioners
Cassette Type Indoor Unit
Models:
ACMI-28VRDC1A
ACMI-36VRDC1A
ACMI-45VRDC1A
ACMI-50VRDC1A
ACMI-56VRDC1A
ACMI-63VRDC1A
ACMI-71VRDC1A
ACMI-80VRDC1A
ACMI-90VRDC1A
ACMI-100VRDC1A
ACMI-112VRDC1A
ACMI-125VRDC1A
ACMI-140VRDC1A
ACMI-160VRDC1A
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.
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.

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 ..................................................................... 5
3.3 Requirements of communication wire selection.......................................... 5
3.4 Wiring Requirement .................................................................................... 6
4 Installation Instructions............................................................................8
4.1 Indoor unit installation ................................................................................. 8
4.2 Refrigerant Pipe Connection....................................................................... 9
4.3 Drainage Pipe Installation and Drainage System Testing ......................... 10
4.4 Panel installation....................................................................................... 12
4.5 Wired controller installation....................................................................... 13
5 Wiring Work ...........................................................................................14
5.1 Connection of Wire and Patch Board Terminal ......................................... 14
5.2 Power Cord Connection............................................................................ 14
5.3 Connection of Communication Wire between Indoor Unit and Outdoor
Unit(or indoor unit) .......................................................................................... 15
5.4 Connection of Communication Wire for Wired Controller ......................... 15
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network. 16
6 Routine Maintenance.............................................................................18
6.1 Cleaning of Filter....................................................................................... 18
6.2 Maintenance before the Seasonal Use..................................................... 18
6.3 Maintenance after the Seasonal Use........................................................ 18
7 Table of Error Codes for Indoor Unit......................................................19
8 Troubleshooting.....................................................................................19

Multi Variable Air Conditioners Cassette 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.
Please install the unit according
to instructions in this manual.
Read this manual carefully
before starting up or checking
the machine.
For units with wired controller,
do not connect power supply
until the wired controller is well
installed. Otherwise, the wired
controller cannot be used.
Diameter of power cord must
be large enough. Damaged
power cord and connecting
wire must be replaced by
specialized electric cable.
Nitrogen must be charged
according to technical
requirements.
Make sure the local power
supply is in accordance with
units before installation,
and check the power supply
carefully.
Installation should be
performed by dealer or qualied
technicians. Do not install the
product by yourself. Improper
installation may result in water
leakage, electric shock or re
hazard.
Please use specialized
accessories or parts to carry
out installation,or water
leakage, electric shock,re
hazard may resulted.
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.
R410A refrigerant can produce
poisonous gas once it meets
fire, so please ventilate the
room immediately if refrigerant
leaks out during installation.
After the power cord is
connected, please install the
cover of electric box to avoid
danger.
Short circuit is forbidden.
Do not cancel the pressure
switch in case the unit may be
damaged.
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.
N2
Specialized
Fittings
Specialized

Multi Variable Air Conditioners Cassette Type Indoor Unit
2
＜5Min

26 C
30 C
Do not extend ngers or
objects into air outlet or air
return grille.
Never start or stop the air
conditioner by inserting or
removing the power cord.
Children are not allowed to
operate the air conditioner.
Please turn the unit off and
unplug your air conditioner
before cleaning. Otherwise, it
may cause electric shock or
personal injury.
Do not expose the air
conditioner directly to water or
place it in a damp or corrosive
environment.
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.)
If abnormal condition occurs
(e.g. unpleasant smell), please
turn off the unit at once and
disconnect power supply. Then
contact ALPICAIR 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 re hazard.)
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.
Do not turn off the air
conditioner until it runs for at
least 5 minutes. Otherwise, oil-
return of the compressor will be
affected.
Do not operate the air
conditioner with wet hands.
Do not spray water on the
air conditioner or it will cause
malfunction or electric shock.
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.)
During Cooling mode, indoor
temperature should not be set
too low. Keep the difference
between indoor temp and
outdoor temp within 5°C.
Do not repair the air conditioner
by yourself. Improper repair
will cause electric shock or
fire hazard. Please contact
ALPICAIR 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 ALPICAIR
Electric Appliances, Inc. of Zhuhai.
2 Product Introduction
2.1 Names of Key Components
1
2
3
4
5
6
No. ①②③④⑤⑥
Name Air Outlet Filter Air Inlet Grille Fittings Louver Drainage Pipe
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
Indoor Unit Working Temperature Range:16°C~ 32°C.
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

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Notes:
①
√: included, X: not included
②
Please 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
Use the following provided accessories according to the requirement.
No. Name Appearance Q'ty Usage
1wireless controller 1 To control the indoor unit
2paper pattern for installation
Lifting bolt distance is
680mm
Lifting bolt distance is 780mm
INSTALLATION MODEL PAPER
Drainage side
Pipe side
Installationhole
inthe main body
Centerof ceiling opening
Archinstallation paper
Ceiling
Articulation
Screw
Installationhole
inthe main body
Installationhole
inthe main body
Installationhole
inthe main body
1Locate the drill hole on ceiling
3Tapping screw with washer 4Fix paper pattern
4Washer xing plate 4Prevent the washer from falling off
5Drain Hose Assembly 1To connect with the hard PVC drain
pipe
6 Special Nut 1 To be used for connecting the
refrigerant pipe
7M10X8 Nut with Washer 4To be used together with the
hanger bolt for installing the unit.
8M10 Nut (M10X8.4 Nut) 4To be used together with the
hanger bolt for installing the unit.
9M10 Washer (Spring Washer
M10X2.6) 4To be used together with the hanger bolt for installing the unit.
10 Insulation 1 To insulate the gas pipe
11 Insulation 1 To insulate the liquid pipe
12 Sponge 1 To insulate the drain pipe
13 Fastener 4 To fasten the sponge

Multi Variable Air Conditioners Cassette Type Indoor Unit
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3.2 Installation Position Selection
(1) The appliance shall not be installed in the laundry.
(2) The location should be able to withstand the weight of unit.
(3) The water can be drained conveniently from drainage pipe.
(4) There should be no obstruction near air inlet and air outlet.
(5) Follow the installation distance required in the fig below to ensure sufficient space for
maintenance.
(6) The installation location should be far from heat sources, ammable or explosive gas, or smog
spread in the air.
(7) 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 ensure, there may be noise if the electric wave is too strong.)
Unit: mm
H
>20
90~140
28~50
Ceiling
Wall
Floor
Wal
Model
H
210
260
340
56~80
160
315
Fig 3.2
Notes:
①
The unit shall be installed in accordance with national standards or local regulations..
②
Only qualied 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
Notes:
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
Sub-master
Controller
Master
Controller
Indoor Unit 1 Indoor Unit 2 Indoor Unit 3 Indoor Unit n
L=Lx1+Lx2+L1+L2+......+L(n-1)(n≤16)
L1
Lx1Lx2
L2 L(n-1)
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 eld 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)
Indoor Unit 1 Indoor Unit 2 Indoor Unit n
Outdoor
unit1
Outdoor
unit 2
Outdoor
unit 3
Outdoor
unit 4
LO1
L=LO1+LO2+LO3+Li1+Li2+.......+Lin(n≤80)
LO2 LO3 Lin
Fig 3.3.2
Wire type
Total length of
communication wire between
indoor unit and indoor
unit(outdoor unit) (m)
Wire diameter
(mm2)Wire standard Remark
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000 ≥2×0.75 IEC 60227-
5:2007
1. If the wire diameter is
enlarged to 2 × 1 mm2, the
total communication cable
length can reach 1500 m.
2. The cord shall be
Circular cord (the cores shall
be twisted together).
3. If unit is installed in
places with intense magnetic
eld or strong interference,
it is necessary to use
shielded wire.
3.4 Wiring Requirement
(1) Dimension of power cord and capacity of air switch
Model Power Cord Size Air Switch Capacity
Minimum Sectional
Area of Ground
Wire
Minimum
Sectional Area of
Power Cord

Multi Variable Air Conditioners Cassette Type Indoor Unit
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220~240V-1ph-50Hz
208~230V-1ph-60Hz
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
6 1.0 1.0
Notes:
①
An all-pole disconnection switch having a contact separation of at least 3mm in all poles should
be connected in xed wiring.
②
The circuit breaker and power cord specication in above sheet is based on max power(max
current) of the unit.
③
The power cord specication in above sheet is based on ambient temperature of 40°C.
④
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 specication sheet of circuit breaker.
ACMI-28VRDC1A
ACMI-36VRDC1A
ACMI-45VRDC1A
ACMI-50VRDC1A
ACMI-56VRDC1A
ACMI-63VRDC1A
ACMI-71VRDC1A
ACMI-80VRDC1A
ACMI-90VRDC1A
ACMI-100VRDC1A
ACMI-112VRDC1A
ACMI-125VRDC1A
ACMI-140VRDC1A
ACMI-160VRDC1A

Multi Variable Air Conditioners Cassette Type Indoor Unit
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4 Installation Instructions
4.1 Indoor unit installation
4.1.1 Ceiling opening Dimension and suspension bolt position.
A(decoration panel)
B(ceiling opening)
C(indoor unit)
E(suspension bolt pitch)
A(decoration panel)
B(ceiling opening)
C(indoor unit)
D(suspension bolt pitch)
Fig 4.1.1
unit:mm
Model A B C D E
28~140 950 890 840 680 780
160 1040 975 910 787 840
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, as shown in g 4.1.3.
Paper pattern
Hole diameterDrill hole according
to the hole site
60～70mm
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
g 4.1.4.
Notes:
The length of bolt depends on the installation height of the unit, bolts are eld supplied.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Expansion bolt
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 x it securely by using a nut and washer from upper and lower sides of the hanger bracket.
The washer xing 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 x 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 (lled with water) respectively.
(6) Remove the washer locating plate and then tighten the nut on it.
(7) Remove the paper pattern.
[fix the hoisting stand firmly]
hoisting stand
[fix the washer firmly]
washer fixing plate (provided)
tighten the two nuts
insert
nut (field supplied)
washer (provided)
center of ceiling opening
paper pattern
screw (provided
)
screw (provided) [fix paper pattern]
PVC pipe
level meter
Fig 4.1.5
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 g 4.2.
(2) Tighten the aring nut with torque wrench.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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pipe joint of indoor unit
wrench torque wrench
flaring nut pipe joint
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
Fig.4.2
(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 rmly with tape.
4.3 Drainage Pipe Installation and Drainage System Testing
4.3.1 Notice for Installation of Drain 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 hole and wire binder.
Can’t connect the drainage hole and drainage hole 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
(provided))
drainage pipe
of indoor unit
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, thickness≥1.5mm)
(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, rasing pipe
should be applied.
(4) Insert the drainage hose into drain socket, tighten the metal clamp securely.
(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.

Multi Variable Air Conditioners Cassette Type Indoor Unit
11
(7) Apply the suitable diameter for converging drainage pipe according to the operating capacity
of the unit.
0~675 mm
1
Fig 4.3.2
① -drainage pipes assembled by T-shaped joints
(8) 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.
(9) If the raising pipe is vertical with the unit, the distance between raising pipe and unit should
be less than 300mm.
Fig 4.3.3
Model A(mm) B(mm)
28~50 170 830
56~160 220 780
(10) 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.
1000-1500mm
×
Fig 4.3.4
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is nished.
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
transparent part of 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 drains normally through drainage port. The water pump will stop automatically
after running for 10min.
(2) During the test, please carefully check the drainage joint, make sure no any leakage occur.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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(3) It’s strongly recommend to do the drain test before ceiling decoration.
watering pot
(the pipe should be about 100mm)
（inject water from air vent）
above 100mm
drainage pipe
Fig 4.3.5
4.4 Panel installation
4.4.1 Notices for installation
(1) Improper decorative panel installation could cause the following problems.
Condensation cause water drop
dew
air leakage
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.
There can't be gap
Fig 4.4.2
(3) Connect the decoration panel terminals (Female) to body terminals (male) as shown in gure
4.4.3.
indoor unit side panel side
Fig 4.4.3

Multi Variable Air Conditioners Cassette Type Indoor Unit
13
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 ttings on the same corner.
(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 g 4.4.4.
(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, x the panel on the body rmly.
(5) After tightening screws, reinstall the air inlet grille.
c
eiling
air outlet ⑤
decoration panel
5-8mm
.
indoor unit sealing mate
r
4.5 Wired controller installation
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.
Notes:
Do perform the commissioning operation before rst use, automatic addressing or other settings,
please refer to the manual of ODU.

Multi Variable Air Conditioners Cassette Type Indoor Unit
14
5 Wiring Work
Warning!
Before obtaining access to terminals, all supply circuits must be disconnected.
Notes:
①
Units must be earthed securely, or it may cause electric shock.
②
Please carefully read the wiring diagram before carry out the wiring work, incorrect wiring could
cause malfunction or even damage the unit.
③
The unit should be powered by independent circuit and specic 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 and outdoor unit.
⑧
Adjust the static pressure via wired controller according to site circumstance.
5.1 Connection of Wire and Patch Board Terminal
(1) The connection of wire (as shown in g 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 g 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.
single branch wire
insulation layer insulation layer
multiple twisted wires
wiring terminal
Fig 5.1.1 Fig 5.1.2
5.2 Power Cord Connection
Notes:
All indoor units must be unied of power supply so that they can be powered ON/OFF at the same
time.

Multi Variable Air Conditioners Cassette Type Indoor Unit
15
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.
3) Connect the power cord to terminal "L, N, ".
4) Fix the power card with wiring clamp.
(2) For units with three-phase power supply.
1) Let the power cord pass through the wiring through-holes.
2) Connect the power cord to terminal "L1, L2, L3, N, ".
3) Fix the power cable 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 g 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
(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 Connection of Communication Wire for Wired Controller
(1) Detach the electric box lid.
(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.

Multi Variable Air Conditioners Cassette Type Indoor Unit
16
(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.
(Optional)
H1H2
(Standard)
signal receiver
H1H2
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.
(Standard)
(Optional)
H1H2
Fig 5.4.3
5.5 Illuminate for Connection of Wired Controller and Indoor Units Network
(1) Communication wire of indoor unit and outdoor unit (or indoor unit) is connected to D1,D2.
(2) Wired controller is connected to H1,H2.
(3) One indoor unit can connect two wired controllers that must be set as master one and slave
one.
(4) One wired controller can control 16 indoor unitS in maximum at the same time. (as shown in
g 5.5)