Air conditioning
Installation and User Manual
Cassette - Multi-Split
Thank you for choosing our product. For proper operation, please read this manual carefully and keep this
manual. If you lose the user manual, contact the installer, or visit www.nipon-coolair.com, or send an e-mail
to geral@nipon-coolair.com to obtain the digital version.
Cassete - Multi-Split
Models:
MB12 GA
MB18 GA
MB24 GA
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.
R32: 675
Cassete - Multi-Split
Contents
1 Safety Precautions ..........................................................................................1
2 Outline of the Unit and Main Parts...................................................................3
3 Operation of remote controller.........................................................................4
3.1 Buttons on remote controller ......................................................................4
3.2 Introduction for icons on display screen..................................................... 4
3.3 Introduction for buttons on remote controller.............................................. 5
3.4 Function introduction for combination buttons............................................ 9
3.5 Operation guide........................................................................................10
3.6 Replacement of batteries in remote controller..........................................1 0
4 Preparative for Installation .............................................................................11
4.1 Standard Accessory Parts ........................................................................1 1
4.2 Selection of the Installation Location ........................................................1 1
4.3 Connection Pipe Requirement .................................................................12
4.4 Electrical Requirement .............................................................................1 3
5 Installation of the Unit ....................................................................................1 4
5.1 Installation of the Indoor Unit ....................................................................14
5.2 Installation of the Connection Pipe ...........................................................1 6
5.3 Vacuum and Gas Leakage Inspection ...................................................... 20
5.4 Installation of the Drain Hose ................................................................... 22
5.5 The Panel Installation .............................................................................. 25
5.6 Electrical Wiring ........................................................................................27
6 Installation of Controllers ............................................................................... 31
7 Test Running ..................................................................................................31
7.1 Trial Operation and Testing .......................................................................31
8 Troubleshooting and Maintenance ................................................................34
8.1 Troubleshooting ........................................................................................34
8.2 Routine Maintenance ...............................................................................35
9 Safety operation of flammable refrigerant ..................................................... 37
Cassete - Multi-Split
Please read this operating manual carefully before operating the unit.
to the material objects for reference.
The Refrigerant
To realize the function of the air conditioner unit, a special refrigerant circulates
leads to explosion
. It can
Compared to common refrigerants, R32 is a nonpolluting refrigerant with no
lower. R32 has got very good thermodynamic features which lead to a really high
.
WARNING:
Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacture. Should repair be necessary, contact your nearest
authorized Service Centre. Any repairs carried out by unqualified personnel
may be dangerous. The appliance shall be stored in a room without continuously
operating ignition sources. (for example: open flames, an operating gas appliance
or an operating electric heater.) Do not pierce or burn.
Appliance shall be installed, operated and stored in a room with a floor area larger
than X m . (Please refer to table "a" in section of " Safety Operation of Inflammable
Refrigerant" for Space X.)
Appliance filled with flammable gas R32. For repairs, strictly follow manufacturer’s
instructions only. Be aware that refrigrants not contain odour. Read specialist’s
manual.
2
1 Safety Precautions
Cassete - Multi-Split
WARNING!
CAUTION!
(1). Installation should be left to the dealer or another professional. Improper installation may cause
(2). Install the air conditioner according to the instructions given in this manual. Incomplete installation
(3).
(4). Install the air conditioner on a solid base that can support the weight of the unit. An inadequate base
or incomplete installation may cause injury in the event the unit falls off the base.
(5). Electrical work should be carried out in accordance with the installation manual and the national
(6). Be sure to use a dedicated power circuit. Never use a power supply shared by another appliance.
(7). For wiring, use a cable length enough to cover the entire distance with no connection. Do not use
an extension cord. Do not put other loads on the power supply, use a dedicated power circuit.
(8).
Firmly clamp the interconnecting wires so their terminals receive no external stresses. Incomplete
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.
WARNING!
(9). After connecting interconnecting and supply wiring be sure to shape the cables so that they do not
put undue force on the electrical covers or panels. Install covers over the wires. Incomplete cover
(10). tnaregirfer ehT( .moor eht etalitnev ,krow noitallatsni eht gnirud tuo dekael sah tnaregirfer yna fI
(11). After all installation is complete, check to make sure that no refrigerant is leaking out. (The
(12). When ins talling or relocating the system, be sur e to keep the refrigerant circuit free from
foreign substance in the refrigerant circuit causes an abnormal pressure rise or rupture, resulting in
injury.)
(13). During pump-down, stop the compressor before removing the refrigerant piping. If the compressor
is still running and the stop valve is open during pump-down, air will be sucked in when the
refrigerant piping is removed, causing abnormal pressure in the freezer cycle which will lead to
breakage and even injury.
1
Cassete - Multi-Split
(14). During installation, attach the refrigerant piping securely before running the compressor. If the
compressor is not attached and the stop valve is open during pump-down, air will be sucked in
when the compressor is run, causing abnormal pressure in the freezer cycle which will lead to
breakage and even injury.
(15). Be sure to establish an earth. Do not earth the unit to a utility pipe, arrester, or telephone earth.
sources may cause damage to the air conditioner.
(16). Be sure to install an earth leakage breaker. Failure to install an earth leakage breaker may result in
(17). This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a person responsible for their safety.
(18). Children should be supervised to ensure that they do not play with the appliance.
(19). If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
(20). 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.
CAUTION!
(1). Do not install the air conditioner in a place where there
(2). Establish drain piping according to the instructions of this manual. Inadequate piping may cause
(3).
2
2 Outline of the Unit and Main Parts
Indoor
5 6
Cassete - Multi-Split
1
2
3
4
1. Drainage device
2. Drainage pipe
Outdoor
Air outlet
Air inlet
Fig.1
4. Connection pipe
5. Wired Controller
6. Wireless Controller
7. Big handle
7
8. Liquid Pipe
8
9. Gas pipe
9
10. Drainage pipe
10
11
11. Front Board
3
Cassete - Multi-Split
3 Operation of remote controller
3.1 Buttons on remote controller
3
4
5
6
9
11
13
14
1
2
7
8
10
12
15
1 ON/OFF button
2 MODE button
3 +/- button
4 FAN button
5 I FEEL button
6 button
7 button
8 button
9 CLOCK button
TIMER ON/TIMER OFF
10
button
X-FAN button
11
Note: X-FAN is the same with BLOW
12 TEMP button
13 TURBO button
14 SLEEP button
15 LIGHT button
3.2 Introduction for icons on display screen
Health function
Operation mode
Auto mode
Cool mode
Dry mode
Fan mode
Heat mode
Clock
Sleep mode
Temp. display type
:Set temp.
:Outdoor ambient temp.
:Indoor ambient temp.
4
Set fan speed
Send signal
AIR function
I feel
X-fan mode
Set temperature
Turbo mode
TIMER ON / TIMER OFF
Set time
Child lock
Light
Up & down swing
Note:
1
2
Cassete - Multi-Split
T FRY T
F
Note:
F F
Cassete - Multi-Split
+/- button
3
ture 1 .
Holding "+" or "-" button, 2s later, set temperature on remote controller will
tor on indoor unit will change accordingly. (Temperature can’t be adjusted under
auto mode)
TIMER ON, TIMER OFF or CLOCK, press "+" or "-" button to
adjust time. (Refer to CLOCK, TIMER ON,
TIMER ON, TIMER OFF or CLOCK, press "+" or "-" button to adjust time. (Refer
to CLOCK, TIMER ON, TIMER OFF buttons)
FAN button
4
Pressing this button can set fan speed circularly as: auto (AUTO), low( ) ,medium
( ), high( ).
Auto
Note:
AUTO Speed,IDU fan motor will adjust the fan speed (high, medium or
low speed) according to ambient temperature.
d.
I FEEL button
5
Press this button to start I FEEL function and " " will be displayed on the remote
controller. After this function is set, the remote controller will send the detected
ambient temperature to the controller and the unit will automatically adjust the
indoor temperature according to the detected temperature. Press this button again
to close I FEEL function and " " will disappear.
ser when this function is set. Do not put
the remote controller near the object of high temperature or low temperature in
order to avoid detecting inaccurate ambient temperature.
area where indoor unit can receive the signal sent by the remote controller.
6
Press this button to set HEALTH function ON or OFF. After the unit is turned on, it
defaults to HEALTH function ON.
7
Press this button to select AIR function ON or OFF.
button
button
(Only available for some models)
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Cassete - Multi-Split
8
Press this button can select up&down swing angle. Fan blow angle can be selected
circularly as below:
louver will automatically swing up & down at maximum angle.
required angle, release the button.
button
no display
(horizontal louvers stops
at current position)
. Horizontal
Note:
air conditioner will blow fan automatically.
CLOCK button
9
Press this button to set clock time. " " icon on remote controller will blink. Press
"+" or "-" button within 5s to set clock time. Each pressing of "+" or "-" button, clock
time will increase or decrease 1 minute. If hold "+" or "-" button, 2s later, time will
change quickly. Release this button when reaching your required time. Press
Note:
The interval between two operation can’t exceeds 5s. Otherwise, remote contro-
ller will quit setting status. Operation for TIMER ON/TIMER OFF is the same.
TIMER ON / TIMER OFF button
10
TIMER ON button
"TIMER ON" button can set the time for timer on. After pressing this button, " "
icon disappears and the word "ON" on remote controller blinks. Press "+" or "-"
button to adjust TIMER ON setting. After each pressing "+" or "-" button, TIMER
ON setting will increase or decrease 1min. Hold "+" or "-" button, 2s later, the
time will change quickly until reaching your required time.
The word "ON" will stop blinking. " " icon
resumes displaying. Cancel TIMER ON: Under the condition that TIMER ON is
7
Cassete - Multi-Split
started up, press "TIMER ON" button to cancel it.
TIMER OFF button
"TIMER OFF" button can set the time for timer off. After pressing this button," "
icon disappears and the word "OFF" on remote controller blinks. Press "+" or "-"
button to adjust TIMER OFF setting. After each pressing "+" or "-" button, TIMER
OFF setting will increase or decrease 1min. Hold "+" or "-" button, 2s later, the
time will change quickly until reaching your required time.
Press "TIMER OFF" word "OFF" will stop blinking. " " icon resumes displaying.
Cancel TIMER OFF. Under the condition that TIMER OFF is started up, press
"TIMER OFF" button to cancel it.
Note:
ff status, you can set TIMER OFF or TIMER ON simultaneously.
TIMER ON or TIMER OFF, please adjust the clock time.
After starting up TIMER ON or TIMER OFF, set the constant circulating valid.
After that, air conditioner will be turned on or turned off according to setting time.
ON/OFF button has no effect on setting. If you don’t need this function, please
use remote controller to cancel it.
X-FAN button
11
Press this button under cool and dry mode to start up x-fan function, and " " icon
on remote controller will be displayed. Press this button again to cancel x-fan
function, and " "icon will disappear.
Note:
f, indoor fan will still
operate at low speed for a while to blow the residual water inside the air duct.
FAN button to turn off x-fan function. Indoor fan
will stop operation immediately.
TEMP button
12
erature or outdoor ambient temperature on indoor unit’s display. The setting on
remote controlleris selected circularly as below:
no display
r, temperature indicator
on indoor unit displays set temperature.
r, temperature indicator on indoor unit
displays indoor ambient temperature.
8
Cassete - Multi-Split
r, temperature indicator on indoor unit
displays outdoor ambient temperature.
Note:
Outdoor temperature display is not available for some models. At that time, indoor
unit receives " "signal, while it displays indoor set temperature.
’s defaulted to display set temperature when turning on the unit.There is no
display in the remote controller.
y.
temperature indicator displays corresponding temperature and automatically turn
TURBO button
13
Under COOL or HEAT mode, press this button to turn to quick COOL or quick
HEAT mode. " " icon is displayed on remote controller. Press this button again
to exit turbo function and " " icon will disappear.
SLEEP button
14
Under COOL, HEAT mode, press this button to start up sleep function. " " icon
is displayed on remote controller. Press this button again to cancel sleep function and
" " icon will disappear.
LIGHT button
15
Press this button to turn off display light on indoor unit. " " icon on remote
controller disappears. Press this button again to turn on display light. " " icon is
displayed.
3.4 Function introduction for combination buttons
Child lock function
Press "+" and "-" simultaneously to turn on or turn off child lock function. When
child lock function is on, " " icon is displayed on remote controller. If you operate
the remote controller, the " " icon will blink three times without sending signal to
the unit.
Temperature display switchover function
Under OFF status, press "-" and "MODE" buttons simultaneously to switch temperature display between and .
9
Cassete - Multi-Split
3.5 Operation guide
After putting through the power, press "ON/OFF" button on remote controller to
1.
turn on the air conditioner.
Press "MODE" button to select your required mode: AUTO, COOL, DRY, FAN,
2.
HEAT.
Press "+" or "-" button to set your required temperature. (Temperature can’t be
3.
adjusted under auto mode).
Press "FAN" button to set your required fan speed: auto, low, medium and high
4.
speed.
Press " " button to select fan blowing angle.
5.
3.6 Replacement of batteries in remote controller
1. Press the back side of remote controller marked
the cover of battery box along the arrow direction.
2. Replace two 7# (AAA 1.5V) dry batteries, and
make sure the position of "+" polar and "-" polar
are correct.
3. Reinstall the cover of battery box.
signal sender
Cover of battery box
battery
reinstall
remove
NOTICE
ntrol signal sender at the receiving
window on indoor unit.
The distance between signal sender and receiving window should be no
more than 8m, and there should be no obstacles between them.
or wireless telephone; remote controller should be close to indoor unit during
operation.
batteries.
’s no display, please
replace batteries.
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Cassete - Multi-Split
Preparative for Installation
.1 Standard Accessory Parts
The standard accessory parts listed below are furnished and should be used as required.
No. Name Appearance Q'ty Usage
1 Drain Hose
Table 1
Indoor Unit Accessories
To connect with the hard PVC drain
1
pipe
2 Nut with Washer
3 Washer
4 installation paperboard
5 Gasket mounting board
Wireless Controller
6
7 sealing plaster
8 Fastener
9 Insulation
10 Insulation
11 Sponge
12 Nut
13 Nut
14 Enswathement
+Battery
4
unit.
To be used together with the
10
hanger bolt for installing the unit.
1 used for ceiling drilling
Used to prevent gasket from falling
4
off
1+2 To control the indoor unit
1
4 To fasten the sponge
1 To insulate the gas pipe
1 To insulate the liquid pipe
4 To insulate the drain pipe
1 To connect gas pipe
1 To connect liquid pipe
2
.2 Selection of the Installation Location
WARNING!
otherwise the unit would topple or fall off.
CAUTION!
Do not install where there is the danger of combustible gas leakage.
.
.
Children under 10 years old must be supervised not to operate the unit.
.
Decide the installation location with the customer as follows:
,
Cassete - Multi-Split
.2.1 Indoor Unit
Select an installation site where the following conditions are fulfilled and that meets your
customer’s approval.
(1). Obstruct should be put away from the intake or outlet vent of the indoor unit so that the
(2). Make sure t hat the installation mee ts the requirement of the schemat ic diagram of
installation spaces.
(3). Select the place where can stand 4 times of the weight of the indoor unit and would not
increase the operating noise and vibration.
(4). The horizontality of the installation place should be guaranteed.
(5). Select the place where is easy to drain out the condensate water, and connect with outdoor
unit.
(6). Make sure that there are enough space for care and maintenance, and the height fall
between the indoor unit and ground is above 1800mm.
(7). When installing the suspension bolt, check if the installation place can stand 4 times of the
weight of the unit. If not, reinforce it before installation.
Note: There will be large amount of greasy dirt accumulated on the fan, heat exchanger and water
pump located in the dinning room and kitchen, which would reduce the capacity of the heater
exchanger, lead to leakage and abnormal operation of the water pump.
Table 2
Models H(mm)
MB12 GA
MB18 GA
MB24 GA
Fig.2
255
260
.3 Connection Pipe Requirement
CAUTION!
The maximum length of the connection pipe is listed in the table below. Do not place the units between
which the distance exceeds the maximum length of the connection pipe.
Item
Model
Size of Fitting
Pipe(Inch)
Liquid Gas
Cassete - Multi-Split
Table 3
Max.
Pipe
Length
(m)
Max. Height
Difference between
Indoor Unit and
Outdoor Unit (m)
Drainage
pipe(Outer
Diameter × wall
thickness) (mm)
MB12 GA
MB18 GA 1/2 20 15
MB24 GA 15
1/4
3/8 5/8 30
3/8 20 15
The connection pipe should be insulated with proper water-proof insulating material.
The pipe wall thickness shall be 0.5-1.0mm and the pipe wall shall be able to withstand the
pressure of 6.0 MPa. The longer the connecting pipe, the lower the cooling and heating effect
performs.
4.4 Electrical Requirement
Electric Wire Size and Fuse Capacity.
Table 4
Indoor Units
12~24k 220-240V~ 50Hz 5 0.75
Notes:
.
The fuse is located on the main board.
.
Install the disconnect device with a contact gap of at least 3mm in all poles nearby the units
(Both indoor unit and outdoor unit).The appliance must be positioned so that the plug is
accessible.
.
based on the maximum power (maximum amps) of the unit.
.
guarded multi-wire copper cable (like, YJV copper cable, consisting of PE insulated wires and
a PVC cable jacket) used at and resistible to IEC 60364-5-52). If the working
Power Supply Fuse Capacity Min. Power Supply Cord
V/Ph/Hz A mm
2
13
Cassete - Multi-Split
Installation of the Unit
.1 Installation of the Indoor Unit
.1.1 Indoor unit dimension
For the units: 12-18k
For the units: 24k
Item
Model
MB 12 GA
MB 18 GA
MB 24 GA
Fig.
Table
ABC D E F G
670 666 600 496 145 240 596
950 840 780 680 145 240 -
Cassete - Multi-Split
.1.2 Installing the Main Body Unit
Fig.
(1). Install the hoisting stand on the hoisting screw by using nuts and gaskets at both the upper
and lower sides of the hoisting stand. To prevent the gasket from breaking off, a gasket
anchor board can be helpful.
(2).
(3). Adjust the unit to the best position.
(4). Check if the unit is installed horizontally at four directions. If not, the water pump and the
(5). Remove the gasket anchor board and tighten the nut remained.
(6). Remove the paper template.
.1.3 Installing the Suspension Bolts
(1). Using the installation template, drill holes for bolts (four holes). (Fig. )
(2). Install the bolts to the ceiling at a place strong enough to hang the unit. Mark the bolt
positions from the installation template. With a concrete drill, drill for 12.7mm (1/2”)
diameter holes. (Fig. )
(3). Insert the anchor bolts into the drilled holes, and drive the pins completely into the anchor
bolts with a hammer. (Fig. )
Fig. Fig. Fig.
Cassete - Multi-Split
.1.4 Leveling
The water level test must be done after installing the indoor unit to make the unit is horizontal,
as shown below.
Horizontal tester
Fig.8
.2 Installation of the Connection Pipe
.2.1 Flare Processing
(1). Cut the connection pipe with the pipe cutter and remove the burrs.
(2). Hold the pipe downward to prevent cuttings from entering the pipe.
(3). Remove the
(4).
Fig.9
Fig.9
Cassete - Multi-Split
.2.2 Bending Pipes
(1). The pipes are shaped by your hands. Be careful not to collapse them.
Fig.10
(2). Do not bend the pipes in an angle more than 90°.
(3). When pipes are repeatedly bent or stretched, the material
Heat insulating
will
more. Do not bend or stretch the pipes more than three
times.
(4). When bending the pipe, do not bend it as is. The pipe
will be collapsed. In this case, cut the heat insulating pipe with a sharp cutter as shown in
Fig.11, and bend it after exposing the pipe. After bending the pipe as you want, be sure to
put the heat insulating pipe back on the pipe, and secure it with tape.
CAUTION!
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of 150
.
mm or over.
If the pipe is bent repeatedly at the same place, it will break.
.
Pipe
pipe
Cutter
Cutt line
Fig.11
.2.3 Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
CAUTION!
Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is improper,
.
the flare nut cannot be tightened smoothly. If the flare nut is forced to turn, the threads will be
damaged.
.
impurities from coming into the pipe system.
When connecting the pipe to the unit or removing it from the unit, please do use both the
spanner and the torque wrench.(Fig.12)
1
Cassete - Multi-Split
hand tight and then tighten it with the spanner.
Refer to Table to check if the wrench has been tightened properly (too tight would mangle the
nut and lead to leakage).
Examine the connection pipe to see if it leaks, then take the treatment of heat insulation, as
shown in the Fig.12.
Use the medium-sized sponge to insulate the coupler of the gas pipe.
Fig.12
Table Flare nut tightening torque
Pipe Diameter Tightening Torque
15-30 (N·m)
35-40 (N·m)
60-65 (N·m)
45-50 (N·m)
70-75 (N·m)
80-85 (N·m)
CAUTION!
Be sure to connect the gas pipe after connecting the liquid pipe completely.
1
Cassete - Multi-Split
.2.4 Connecting the Pipe at the Outdoor Side Unit
connector. The tightening method is the same as that as at the indoor
side.
.2.5 Checking the Pipe Connections for Gas Leaking
For both indoor and outdoor unit side, check the joints for gas
leaking by the use of a gas leakage detector without fail when the pipes
are connected.
.2.6 Heat Insulation on the Pipe Joints (Indoor Side Only)
Stick coupler heat insulation (large and small) to the place where connecting pipes.
Fig.13
Fig.14
.2.7 Liquid Pipe and Drain Pipe
If the outdoor unit is installed lower than
the indoor unit (See Fig.15)
(1). A drain pipe should be above ground
and the end of the pipe does not dip into
water. All pipes must be restrained to the
wall by saddles.
(2). Taping pipes must be done from bottom
to top.
(3). All pipes are bound together by tape and
restrained to wall by saddles.
Sealed
Saddle
Drain
pipe
Fig.15
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Cassete - Multi-Split
If the outdoor unit is installed higher than the
indoor unit (See Fig.16)
(1). Taping should be done from lower to the
upper part.
(2). All pipes are bound and taped together
and also should be trapped to prevent
water from returning to the room.
(3). Rest raint all pipes to t he wall wit h
saddles.
Fig.16
Trap
.3 Vacuum and Gas Leakage Inspection
CAUTION!
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There is no
extra refrigerant in the outdoor unit for air purging!
.3.1 Vacuum
(1). Remove the caps of the liquid valve, gas valve and also the service port.
(2). Connect the hose at the low pressure side of the manifold valve assembly to the service
port of the unit’s gas valve, and meanwhile the gas and liquid valves should be kept closed
in case of refrigerant leak.
(3). Connect the hose used for evacuation to the vacuum pump.
(4). Open the switch at the lower pressure side of the manifold valve assembly and start the
vacuum pump. Meanwhile, the switch at the high pressure side of the manifold valve
assembly should be kept closed, otherwise evacuation would fail.
(5). The evacuation duration depends on the unit’s capacity, generally, 15 minutes for the 12k
units, 20 minutes for the 18k units, 30 minutes for the 24 units. And verify if the pressure
gauge at the low pressure side of the manifold valve assembly reads -1.0Mp (-75cmHg),
if not, it indicates there is leak somewhere. Then, close the switch fully and then stop the
vacuum pump.
(6). Wait for some time to see if the system pressure can remain unchanged, 3
units less
pressure gauge at the low pressure side can not be larger than 0.005Mp (0.38cmHg).
than 18k, 5 minutes for the 18K~24k units. During this time, the reading of the
minutes for the
Cassete - Multi-Split
(7). Slightly open the liquid valve and let some refrigerant go to the connection pipe to balance
the pressure inside and outside of the connection pipe, so that air will not come into the
connection pipe when removing the hose. Note that the gas and liquid valve can be opened
fully only after the manifold valve assembly is removed.
(8). Place back the caps of the liquid valve, gas valve and also the service port.
gauge manifold
pipe
Low pressure gauge
High pressure gauge
pipe
Hose with the valve pin
Service port
Fig.17
Note: For the large-sized unit, it has the service port for both the gas valve and the liquid valve.
During evacuation, it is available to connect two hoses of the manifold valve assembly to two
service ports to quicken the evacuating speed.
Gauge manifold kit
VAC valve
Vacuum pump
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Cassete - Multi-Split
5.4 Installation of the Drain Hose
5 .4.1 Installationof Drain Piping
(1). Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so
that air may not remain trapped inside the pipe.
(2). Keep pipe size equal to or greater than that of the connecting pipe.
(3). Install the drain piping as shown and take measures against condensation. Improperly
rigged piping could lead to leaks and eventually wet furniture and belongings.
Indoor unit
Extension drain piping
(commercially available)
drain hose
Insulating tube
(commercially
available)
Insulating tape
(accessory)
Fig.19
5.4.2 Installing the Drain Pipes
(1). Insert the drain pipe to the drain outlet of the unit and then tighten the clamp securely with
tape.
(2). Connect the extension drain pipe to the drain pipe and then tighten the clamp with tape.
1
2
A
During the installation, distance from soft drain pipe
to the gasket is Amm 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.
Metal clamp
Drain hose (accessory)
Grey tape (accessory)
Indoor Unit A
MB12 GA
MB18 GA
MB24 GA
Insulate the pipe clamp and the drain hose using
heat insulation sponge.
Metal clamp (accessory)
Insulation sponge (accessory)
10±2mm(2/5±2/25inch)
15±3mm(3/5±1/10inch)
1 2
3
22
Cassete - Multi-Split
(3). When unifying multiple drain pipes, install the pipes as Fig.20. Select converging drain
pipes whose gauge is suitable for the operating capacity of the unit.(take the cassette type
unit for example)
100 mm
T-joint converging drain pipes
0~1000mm
0~675 mm
T-joint converging drain pipes
Fig.20
(4). When
(5). If
suction of outdoor air. Therefore, U-type water trap shall be designed on the drainage side
of each indoor unit.(Fig.21)
(6). Install one water trap for each unit.
(7). Installation of water trap shall consider easy cleaning in the future.
Fig.21 Fig.22 Fig.23
(8). Connection of drainage branch pipe to the standpipe or horizontal pipe of drainage main
pipe
The horizontal pipe cannot be connected to the vertical pipe at a same height. It can be
connected in a manner as shown below:
NO.1: Attach the 3-way connection of the drainage pipe joint as shown in Fig.24.
NO.2: Attach the drain elbow as shown in Fig.25.
NO.3: Attach the horizontal pipe as shown in Fig.26.
23
Cassete - Multi-Split
3-way connection
of drainage pipe joint
Fig.24 Fig.25 Fig.26
5.4.3 Precautions When Doing Riser Piping Work
(1). Make sure that heat insulation work is executed on the following 2 spots to prevent any
possible water leakage due to dew condensation.
1). Connect the drain hose to the drain lift pipe, and insulate them.
2). Connect the drain hose to the drain outlet on the indoor unit, and tighten it with the clamp.
Connection of drain elbow
Drain lift pipe
Connection of horizontal pipe
Fig.27
(4). Secure a downward gradient of 1/100 or more for the drain pipe. To accomplish this, mount
supporting brackets at an interval of 1 -1.5 m.
1-1.5m
(Correct) 1/100 or more gradient
Fig.28
(5). The incline of attached drain hose should be 75 mm or less so that the drain outlet does not
have to withstand additional force.
Fig.29
(wrong)
×
24
Cassete - Multi-Split
.4.4 Testing of Drain Piping
Shown in the Fig. , Add approximately 1liter of water slowly into the drain pan and check
Drain vent for repair use (plastic stopper
is included) (drain the water in waterspoit
by this outlet vent)
Above 100mm
.5 The Panel Installation
.5.1 Precautions
(1).
Drain hose Test hole cover
Test hole
<Immiting water from the rest hole>
Plastic water pot (The length of
the pipe should be about 100mm.)
Fig.
The connecting
pipe should be located
corresponding to
the marking.
Fig.3
(2). Improper screwing of the screws may cause the troubles shown in Fig.3 .
Condensate
Fig.3
Cassete - Multi-Split
(3). If gap still exists between ceiling and decoration panel after tightening the screws, readjust
the height of the indoor unit. (Fig.3 )
Fig.3
Fig.3(4).
Fig.3
.5.2 Installing the Panel
(1). .
(2). Latch other two hooks.
(3). Tighten four hexagonal screws under the latches about 15mm.
(4). Adjust the panel along the direction indicated by the arrow as shown in Fig.3 .
(5). Tighten the screws until the thickness of the sealing material between the panel and the
indoor unit reduces to 5-8cm.
Cassete - Multi-Split
Fig.3
5.6 Electrical Wiring
5.6.1 Wiring Precautions
WARNING!
Before obtaining access to terminals, all supply circuits must be disconnected.
.
The rated voltage of the unit is as shown as Table 4
.
Before turning on, verify that the voltage is within the 198~264V range(for single phrase unit) or
.
342~457V range (for three-phrase unit).
Always use a special branch circuit and install a special receptacle to supply power to the air
.
conditioner.
The special branch circuit breaker is installed in the permanent wiring. Always use a circuit that can
.
trip all the poles of the wiring and has an isolation distance of at least 3mm between the contacts of
each pole.
Perform wiring work in accordance with standards so that the air conditioner can be operated safely
.
and positively.
Install a leakage special branch circuit breaker in accordance with the related laws and regulations
.
and electric company standards.
27
Cassete - Multi-Split
CAUTION!
The power source capacity must be the sum of the air conditioner current and the current of other
.
capacity.
.
raise the voltage.
5.6.2 Electrical Wiring
(1). For solid core wiring (Fig.3 )
mm (15/16") .
2). Using a screwdriver, remove the terminal screw(s) on the terminal board.
3). Using pliers, bend the solid wire to form a loop suitable for the terminal screw.
4). Shape the loop wire properly, place it on the terminal board and tighten securely with the
terminal screw using a screwdriver.
(2). For strand wiring (Fig.3 )
1). Cut the wire end with a wire cutter or wire-cutting pliers, then strip the insulation about 10
mm (3/8") .
2). Using a screwdriver, remove the terminal screw (s) on the terminal board.
3). Using a round terminal fastener or pliers, securely clamp a round terminal to each stripped
wire end.
4). Position the round terminal wire, and replace and tighten the terminal screw with a
screwdriver.(Fig.3 )
52 tuoba noitalusni eht pirts neht ,sreilp gnittuc-eriw ro rettuc eriw a htiw dne eriw eht tuC .)1
Fig.3
Fig.3 Fig.3
28
Cassete - Multi-Split
After passing the connection cord fasten it with the cord clamp.(Fig.3 )
WARNING!
Before starting work, check that power is not being supplied to the indoor unit and outdoor unit.
.
Match the terminal block numbers and connection cord colors with those of the indoor unit side.
.
Erroneous wiring may cause burning of the electric parts.
.
.
Always fasten the outside covering of the connection cord with cord clamps. (If the insulator is not
.
clamped, electric leakage may occur.)
Always connect the ground wire.
.
(4). Electric wiring between the indoor and outdoor units
Single-phase units(12~24k)
N(1) 2 3
blue brownblack
yellowgreen
Outdoor unit connection
29
Cassete - Multi-Split
(5). Electric wiring of indoor unit side
Remove the electric box cover from the electric box sub-assy and then connect the wire.
Power supply
terminal board
Seal here
to avoid leakage
Fig.3
30
Cassete - Multi-Split
CAUTION!
.
Tighten the power cord respectively on the terminal boards with
.
If the power supply are wired incorrectly, the air conditioner may be damaged.
.
Connect the indoor unit connection cord properly based on the corresponding marks as shown in
.
Fig.3
.
Ground both the indoor and outdoor units by attaching a ground wire.
.
Unit shall be grounded in compliance with the applicable local and national codes.
6 Installation of Controllers
Refer to the Installation Manual of the controller for more details.
7 Test Running
7.1 Trial Operation and Testing
(1). The meaning of error codes as shown below:
31
Cassete - Multi-Split
Table 8
Number Error code Error
1 E1 Compressor high pressure protection
2 E2 Indoor anti-freeze protection
3 E3
4 E4 Compressor high discharge temperature protection
5 E5
6 E6 Communication error
7 E7
8 E8
9 E9 Full water protection
10 F1 Indoor ambient temperature sensor is open/short circuited
11 F2 Indoor evaporator temperature sensor is open/short circuited
12 F3 Outdoor ambient temperature sensor is open/short circuited
13 F4 Outdoor condenser temperature sensor is open/short circuited
14 F5
15 C5
Compressor low pressure protection, refrigerant lack
protection and refrigerant colleting mode
AC over-current protection
Mode conflict
Anti-high temperature protection
Outdoor discharge temperature sensor is open/short circuited
Jumper cap malfunction protection
16 EE
Loading EEPROM malfunction
Note: If there're other error codes, please contact qualified professionals for service.
When the unit is connected with the wired controller, the error code will be simultaneously
shown on it.
32
Cassete - Multi-Split
(2). Instructions to the Error Indicating Lamps on the Panel of the Cassette Type Unit.
Receiver "88" Dispaly "Auto" Button
Timer
Indicating Lamp
Power
Indicating Lamp
"Test" Button
Fig.40
Power and ON/OFF Indicating Lamp:
It goes red when the unit is powered on while it goes white when the unit is started.
Timer Indicating Lamp:
Timer indicator on indoor unit will be on when timer ON is set under off status and timer OFF is
set under on status.
“88” Display:
When there is no error, the dual-8 nixie tube display the set temperature. After receiving the
command of displaying indoor ambient temperature from the remote controller, the dual-8 nixie tube
displays indoor temperature for 3s and then resume to display the set temperature. If there is error,
error code will be displayed. If there’s multiple error, error codes will be displayed in turn.
“Auto” button
It’s used for turning on or turning off the unit. When use this button to turn in the unit,
the unit is under auto mode.
“Test” button
It’s only used for the test units. This button is only valid within 3mins after the unit is
energized.
NOTE:
(1) If the light of indoor unit is turned off, when operating the remote controller to send command, the
display will be on for 3s and then off.
(2) When the wired controller is connected, the indoor unit display is invalid and the unit won’t receive
the remote control command.
33
Cassete - Multi-Split
8 Troubleshooting and Maintenance
8.1 Troubleshooting
following points before repair:
Table 10
Failure Possible Reasons
The power supply is not connected.
.
Electrical leakage of air-conditioning unit causes tripping of the leakage
.
The unit cannot be started.
The unit operates for a
while and then stops.
Poor cooling effect.
switch.
The operating keys are locked.
.
The control loop has failure.
.
There is obstacle in front of the condenser.
.
The control loop is abnormal.
.
Cooling operation is selected when the outdoor ambient temperature is
.
above 48°C.
.
There is heat source or too many people inside the room.
.
The door or window is open.
.
There is obstacle at the air intake or outlet.
.
The set temperature is too high.
.
There is refrigerant leakage.
.
The performance of room temperature sensor becomes worse
.
.
.
The set room temperature is too low.
Poor heating effect
.
.
The outdoor ambient temperature is lower than -5°C.
.
Control loop is abnormal.
.
.egakael tnaregirfer si erehT
Note: After carrying out the check of the above items and taking relevant measures to solve the
problems but the air-conditioning unit still does not function well, please stop the operation of the
unit immediately and contact the local service agency designated. Only ask professional
serviceman to check and repair the unit.
Cassete - Multi-Split
.2 Routine Maintenance
Before accessing to terminal devices, all power supply circuits must be disconnected.
Notes:
the unit.
Do not clean the unit with gasolene, benzene, thinner, polishing powder or liquid insecticide,
otherwise it would cause discoloration and deformation of the unit.
Increase the frequency of cleaning if the unit is installed in a room where the air is extremely
1. Open the air inlet grille
(1). How to open t he panel grille of the
24k cassette type unit
Push the buckle as shown in th e
Remove the screw
Release the screws under buckles by
a screwdriver.
Push the fastener and open the panel
grille.
(2). How to open the panel grille of the
12/18k cassette type unit
Remove the screws by a screwdriver
as shown in the picture.
Push those two fasteners and open
the panel grille.
Push the fastener
Remove the screw
Push the fastener
Cassete - Multi-Split
2. Disassemble the air inlet grille
Open the air inlet grille at 45°, raise it and
remove the grille.
up, wash it by warm water meld with the
Filter screen
Filtering element
Support
Bolt
Note:
Never use hot water over 45°C in case of
color fading or turning yellow.
The same as step 3
7. Install the grille well The same as step 1 and 2
Cassete - Multi-Split
Safety operation of flammable refrigerant
Qualification requirement for installation and maintenance man
All the work men who are engaging in the refrigeration system should bear the
valid certification awarded by the authoritative organization and the qualification
for dealing with the refrigeration system recognized by this industry. If it needs
other technician to maintain and repair the appliance, they should be supervised
by the person who bears the qualification for using the flammable refrigerant.
It can only be repaired by the method suggested by the equipment’s manufacturer.
Installation notes
The air conditioner is not allowed to use in a room that has running fire (such as fire
source, working coal gas ware, operating heater).
It is not allowed to drill hole or burn the connection pipe.
The air conditioner must be installed in a room that is larger than the minimum room
area. The minimum room area is shown on the nameplate or following table a.
Leak test is a must after installation.
2
Minimum
room
area( m )
Charge amount (kg)
floor location
window mounted
2
wall mounted
table a - Minimum room area ( m )
2 3 4 5 6 7 8 2 2.2 2.3 2.4 2.5
5 8 22 24.8 27.8 3 34.3 37.8 5 45.4 4 53.6
/
/
5.2 6.
6 2.4 2.8 3. 3.4 3.8 4.2 4.6 5 5.5 6
/
7 7. 8. 0 2 4 6 5 3 8
ceiling mounted
/
3 4 6 8 2. 2.3 2.6 2.8 3. 3.4 3.7 4
Maintenance notes
Check whether the maintenance area or the room area meet the requirement of the
nameplate.
- It’s only allowed to be operated in the rooms that meet the requirement of the
nameplate.
Check whether the maintenance area is well-ventilated.
- The continuous ventilation status should be kept during the operation process.
Check whether there is fire source or potential fire source in the maintenance area.
- The naked flame is prohibited in the maintenance area; and the “no smoking”
warning board should be hanged.
Check whether the appliance mark is in good condition.
- Replace the vague or damaged warning mark.
Welding
If you should cut or weld the refrigerant system pipes in the process of maintaining,
please follow the steps as below:
37
Cassete - Multi-Split
9 Safety operation of flammable refrigerant
a. Shut down the unit and cut power supply
b. Eliminate the refrigerant
c. Vacuuming
d. Clean it with N2 gas
e. Cutting or welding
f. Carry back to the service spot for welding
The refrigerant should be recycled into the specialized storage tank.
Make sure that there isn’t any naked flame near the outlet of the vacuum pump
and it’s well-ventilated.
Filling the refrigerant
Use the refrigerant filling appliances specialized for R32. Make sure that different
kinds of refrigerant won’t contaminate with each other.
The refrigerant tank should be kept upright at the time of filling refrigerant.
Stick the label on the system after filling is finished (or haven’t finished).
Don’t overfilling.
After filling is finished, please do the leakage detection before test running; another
time of leak detection should be done when it’s removed.
Safety instructions for transportation and storage
Please use the flammable gas detector to check before unload and open the container.
No fire source and smoking.
According to the local rules and laws.
38
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