Midea MSMBB-12CRDN1-MP0W, MSMBC-18CRDN1-MP0W, MSMBD-22CRDN1-MP5W Service Manual
Revision A: 1502250001, Content updated.
National Electrical Code NFPA70/ANSI C1-1993 or current edition and Canadian Electrical
Code Part1 CSA C.22.1.
• The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments
• Installation or repairs made by unqualified persons can result in hazards to you and others.
• Failure to carefully read and follow all instructions in this manual can result in equipment
SERVICE MANUAl
DC Inverter Air Conditioner
Table of Contents
1. Precaution
2. Part Names
3. Dimension
4. Refrigerant Cycle Diagram
5. Printed Circuit Board Connector Wiring Diagram of Outdoor Unit
6. Installation Details
7. Operation Characteristics
8. Electronic Function
9. Troubleshooting
10. Disassembly Instructions
Mini Split 3D
MSMBB-12CRDN1-MP0W
MSMBC-18CRDN1-MP0W
MSMBD-22CRDN1-MP5W
WARNING
• Installation MUST conform with local building codes or, in the absence of local codes, with the
malfunction, property damage, personal injury and/or death.
Models:
This Manual Is For Qualified Service Engineer Use Only
1. Precaution
..................................................................................................................................................... 1
1.1 Safety Precaution .......................................................................................................................... 1
1.2 Warning .......................................................................................................................................... 1
2. Part Names
.................................................................................................................................................... 4
2.1 Model Names of Indoor/Outdoor units .......................................................................................... 4
2.2 Part names of Indoor/Outdoor units .............................................................................................. 5
3. Dimension
..................................................................................................................................................... 6
3.1 Indoor Unit ..................................................................................................................................... 6
3.2 Outdoor Unit................................................................................................................................... 8
4. Refrigerant Cycle Diagram
.......................................................................................................................... 9
5. Printed Circuit Board Connector Wiring Diagram of Outdoor unit
....................................................... 10
6 Installation Details
....................................................................................................................................... 12
6.1 Wrench torque sheet for installation ............................................................................................ 12
6.2 Connecting the cables ................................................................................................................. 12
6.3 Pipe length and the elevation ...................................................................................................... 12
6.4 Installation for the first time .......................................................................................................... 13
6.5 Adding the refrigerant after running the system for many years ................................................. 14
6.6 Procedure when servicing the indoor unit refrigeration circuit. .................................................. 14
6.7 Evacuation after servicing the outdoor unit refrigeration circuit. ................................................ 16
7. Operation Characteristics
......................................................................................................................... 18
8. Electronic function
..................................................................................................................................... 19
8.1 Abbreviation ................................................................................................................................. 19
8.2 Display function ........................................................................................................................... 19
8.3 Main Protection ............................................................................................................................ 20
8.4 Operation Modes and Functions ................................................................................................. 21
9. Troubleshooting
......................................................................................................................................... 26
9.1 Indoor Unit Error Display ............................................................................................................. 27
9.2 Outdoor unit error display ............................................................................................................ 28
9.3 Diagnosis and Solution ................................................................................................................ 31
10 Disassembly Instructions
......................................................................................................................... 56
10.1 Indoor unit .................................................................................................................................. 56
10.2 Outdoor unit ............................................................................................................................... 60
Table Of Contents
1
1. Precaution
1.1 Safety Precaution
n To prevent injury to the user or other
people and property damage, the following
instructions must be followed.
n Incorrect operation due to ignoring
instruction will cause harm or damage.
n Before service the unit, be sure to
read this service manual at first.
1.2 Warning
Ø Installation
n Do not use a defective or underrated
circuit breaker. Use this appliance on a
dedicated circuit.
There is risk of fire or electric shock.
n For electrical work, contact the dealer,
seller, a qualified electrician, or an
authorized service center.
Do not disassemble or repair the product,
there is risk of fire or electric shock.
n Always ground the product.
There is risk of fire or electric shock.
n Install the panel and the cover of
control box securely.
There is risk of fire of electric shock.
n Always install a dedicated circuit and
breaker.
Improper wiring or installation may cause
electric shock.
n Use the correctly rated breaker of
fuse.
There is risk of fire or electric shock.
n Do not modify or extend the power
cable.
There is risk of fire or electric shock.
n Do not install, remove, or reinstall the
unit by yourself (customer).
There is risk of fire, electric shock, explosion,
or injury.
n Be caution when unpacking and
installing the product.
Sharp edges could cause injury, be especially
careful of the case edges and the fins on the
condenser and evaporator.
n For installation, always contact the
dealer or an authorized service center.
n Do not install the product on a
defective installation stand.
n Be sure the installation area does not
deteriorate with age.
If the base collapses, the air conditioner could
fall with it, causing property damage, product
failure, and personal injury.
n Do not let the air conditioner run for a
long time when the humidity is very high
and a door or a window is left open.
n Take care to ensure that power cable
could not be pulled out or damaged during
operation.
There is risk of fire or electric shock.
n Do not place anything on the power
cable.
There is risk of fire or electric shock.
n Do not plug or unplug the power
supply plug during operation.
There is risk of fire or electric shock.
n Do not touch (operation) the product
with wet hands.
n Do not place a heater or other
appliance near the power cable.
There is risk of fire and electric shock.
n Do not allow water to run into
electrical parts.
It may cause fire, failure of the product, or
electric shock.
n Do not store or use flammable gas or
combustible near the product.
There is risk of fire or failure of product.
n Do not use the product in a tightly
closed space for a long time.
Oxygen deficiency could occur.
n When flammable gas leaks, turn off
the gas and open a window for ventilation
before turn the product on.
n If strange sounds or smoke comes
from product, turn the breaker off or
disconnect the power supply cable.
2
There is risk of electric shock or fire.
n Stop operation and close the window
in storm or hurricane. If possible, remove
the product from the window before the
hurricane arrives.
There is risk of property damage, failure of
product, or electric shock.
n Do not open the inlet grill of the
product during operation. (Do not touch the
electrostatic filter, if the unit is so equipped.)
There is risk of physical injury, electric shock,
or product failure.
n When the product is soaked, contact
an authorized service center.
There is risk of fire or electric shock.
n Be caution that water could not enter
the product.
There is risk of fire, electric shock, or product
damage.
n Ventilate the product from time to
time when operating it together with a stove
etc.
There is risk of fire or electric shock.
n Turn the main power off when
cleaning or maintaining the product.
There is risk of electric shock.
n When the product is not be used for a
long time, disconnect the power supply plug
or turn off the breaker.
There is risk of product damage or failure, or
unintended operation.
n Take care to ensure that nobody
could step on or fall onto the outdoor unit.
This could result in personal injury and
product damage.
Ø CAUTION
n Always check for gas (refrigerant)
leakage after installation or repair of
product.
Low refrigerant levels may cause failure of
product.
n Install the drain hose to ensure that
water is drained away properly.
A bad connection may cause water leakage.
n Keep level even when installing the
product.
It can avoid vibration of water leakage.
n Do not install the product where the
noise or hot air from the outdoor unit could
damage the neighborhoods.
It may cause a problem for your neighbors.
n Use two or more people to lift and
transport the product.
n Do not install the product where it will
be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product.
Corrosion, particularly on the condenser and
evaporator fins, could cause product
malfunction or inefficient operation.
Ø Operational
n Do not expose the skin directly to
cool air for long time. (Do not sit in the
draft).
n Do not use the product for special
purposes, such as preserving foods, works
of art etc. It is a consumer air conditioner,
not a precision refrigerant system.
There is risk of damage or loss of property.
n Do not block the inlet or outlet of air
flow.
n Use a soft cloth to clean. Do not use
harsh detergents, solvents, etc.
There is risk of fire, electric shock, or damage
to the plastic parts of the product.
n Do not touch the metal parts of the
product when removing the air filter. They
are very sharp.
n Do not step on or put anything on the
product. (outdoor units)
n Always insert the filter securely.
Clean the filter every two weeks or more
often if necessary.
A dirty filter reduces the efficiency of the air
conditioner and could cause product
malfunction or damage.
n Do not insert hands or other objects
through air inlet or outlet while the product
is operated.
n Do not drink the water drained from
the product.
3
n Use a firm stool or ladder when
cleaning or maintaining the product.
Be careful and avoid personal injury.
n Replace the all batteries in the remote
control with new ones of the same type. Do
not mix old and new batteries or different
types of batteries.
There is risk of fire or explosion.
n Do not recharge or disassemble the
batteries. Do not dispose of batteries in a
fire.
They may burn of explode.
n If the liquid from the batteries gets
onto your skin or clothes, wash it well with
clean water. Do not use the remote of the
batteries have leaked.
4
2. Part Names
2.1 Model Names of Indoor/Outdoor units
Series
Capacity Indoor units
Outdoor units
Inverter
12k MSMBB-12CRDN1-MP0W MOB1-12CDN1-MP0W
18k MSMBC-18CRDN1-MP0W MOC-18CDN1-MP0W
22k MSMBD-22CRDN1-MP5W MOF1-22CDN1-MP5W
5
2.2 Part names of Indoor/Outdoor units
6
3. Dimension
3.1 Indoor Unit
Model W D H
MSMBB-12CRDN1-MP0W
810 mm
(31.89in)
200 mm
(7.87in)
300 mm
(11.81in)
MSMBC-18CRDN1-MP0W
980 mm
(38.58in)
225 mm
(8.86in)
325 mm
(12.80in)
MSMBD-22CRDN1-MP5W
1090 mm
(42.91in)
235 mm
(9.25in)
338 mm
(13.31in)
7
For MSMBB-12CRDN1-MP0W,
For MSMBC-18CRDN1-MP0W,
For MSMBD-22CRDN1-MP5W,
8
3.2 Outdoor Unit
More than 60cm(23.6in)
More than 70cm(27.6in)
More than 30cm(11.8in)
More than 60cm(23.6in)
(Service space)
Fence or
obstacles
More than 30cm(11.8in)
Note: The above drawing is only for reference. The appearance of your units may be different.
Model W D H W1 A B
MOB1-12CDN1-MP0W
780mm
(30.7in)
250mm
(9.8in)
540mm
(21.3in)
843mm
(33.2in)
549mm
(21.6in)
276mm
(10.9in)
MOC-18CDN1-MP0W
760 mm
(29.92in)
285 mm
(11.22in)
590 mm
(23.23in)
823 mm
(32.4in)
530 mm
(50.87in)
290 mm
(11.42in)
MOF1-22CDN1-MP5W
845mm
(33.3in)
320mm
(12.6in)
700mm
(27.6in)
908mm
(35.7in)
560mm
(22.0in)
335mm
(13.2in)
9
4. Refrigerant Cycle Diagram
For cooling only models,
INDOOR
OUTDOOR
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
CAPILIARY TUBE
10
5. Printed Circuit Board Connector Wiring Diagram of Outdoor unit
MOB1-12CDN1-MP0W,
U
V
W
T3-TipeT4-OutDoorTP
PFC-1310
202302130949 CE-KFR26W/BP2(MDY02+1243).D.13.WP2-1
[1.4]2014.02.20
HF
LF
IC2
IC6
PC851
IC5PC817
CN27
FAN_C
CN26 FAN_C
BR2
HS3
OCP1
COM1
HIN1
VB1
HS1
FO2
OCP2
FO1
LS1
U
LS2
V
LS3
W
VBB
VCC3
VB3
COM3
LIN3
OCP3
FO3
HS2
VB2
VCC2
HIN2
COM2
LIN2
VCC1
LIN1
HIN3
IPM1
BR1
PTC1
CN2
CN1
CN8
CN7
CN21
+
LED1
Yellow
C6
R33
R16
C23
C7
L1
RY1
D3
D1
E8
R67
R66R61
R57R56
R53
R4
C9
CN19AC_FAN
D4
C28
C18
R77
D5
C54
R65
R64
R5
C52
ZR2
ZR1
RY5
RY4
RY3
RY2
R58
R55R47
R46
R45
R44
R43
R42
R39
R36
R35
R32
R31
R30
R29
R21
R19
R18
R17
R15
R14
R11
R10
R9
R8
R7
R6
R2
Q1
IC7
IC1
FUSE1T20A/250VAC
E17
E21
E15
E12E9
+
+
E6
DSA1
D7
D6
D2
C49
C42
C41
C40
C39
C38
C36
C35
C33
C31
C30
C26
C25
C24
C22
C20
C16
C15
C14
C13
C12
C11
C10
C3
C2
C1
IC8
+
-
~~
SSR1
E1
E4
E5
R59
R12
C27
E2
R78
E3
T1
C29
IC10
CN22
CN14
TestPort
C32 C34
C58
C61
C62
C63
C76
C77
C85
C89
C90
C91
C98
C100
C108
C113
C71C51
C148
CN28E2-Burning
CN29Simulation
D13
D14
E11
E13
E10
IC4-1
L3
R24
R25
R26
R27
R28
R60
R63
R82
R83
R84
R85
R86R87
R88
R89
R90
R92
R94
R96
R97
R99
R101R103
R105
R111
R118
R122
R129 R20
R48
R51
R49
R50
R145
R146
C37
C70
C80
R13
E16
R3
R37
R38
R79
R91
C8
C17
R40
R41
R1
C82 C83
IC9
IC4
D9
R54
CN9
Earth
LED2RED
R23
CN42
CompTop
C21
C19
R34
C5
C45
C46
CN60
CN11
4-WAY-L
CN12
4-WAY-N
CN23
N-IN
CN24
L-IN
CN25
S
CN20
C4
R52
C43
C44
C81
R22
D8
X1
DZ1DZ4
DZ5
DZ2
IC3
C47
C48
DZ3
connect to the terminal
CN24(L-IN)-CN23(N-IN)
208-230V AC
power supply
when 4-way is ON, output 208-230VAC
connect to the 4-WAY
CN12 CN11
when heater is ON, output 208-230VAC
CN60
connect to compressor heater
3-4 0VAC / 208-230VAC (high speed running)
5
4
3
2
1
connect to outdoor AC FAN
CN19
2-4 0VAC / 208-230VAC (low speed Running)
1
2
3
4
5
CN27 CN26
AC FAN-CAPACITOR
208-230VAC
CN20
CN1
connect TO REACTOR
2-10V AC(standby);
30-150V AC(running);
connect to the compressor
0VAC (standby)
10-200VAC (running)
W
V
U
CN22
room temp sensor(3-4) RT
pipe temp sensor(1-2) RT
Exaust temp sensor(5-6) RT
123546
NO USE
CN29
NO USE
CN28
210-300VDC (Running)
CAPACITOR Voltage
290-330VDC (standby)
+-
LED1
CN14
connect to detector
test port
MOC-18CDN1-MP0W
11
MOF1-22CDN1-MP5W
12
6 Installation Details
6.1 Wrench torque sheet for
installation
Outside diameter Torque
Additional tightening
torque
Ф6.35mm 1/4in 1500N.cm(153kgf.cm) 1600N.cm(163kgf.cm)
Ф9.52mm 3/8in 2500N.cm(255kgf.cm) 2600N.cm(265kgf.cm)
Ф12.7mm 1/2in 3500N.cm(357kgf.cm) 3600N.cm(367kgf.cm)
Ф15.9mm 5/8in 4500N.cm(459kgf.cm) 4700N.cm(479kgf.cm)
Ф19mm 3/4in 6500N.cm(663kgf.cm) 6700N.cm(683kgf.cm)
6.2 Connecting the cables
The power cord should be selected according
to the following specifications sheet.
Appliance Amps AWG Wire Size
10 18
13 16
18 14
25 12
30 10
The cable size and the current of the fuse or
switch are determined by the maximum
current indicated on the nameplate which
located on the side panel of the unit. Please
refer to the nameplate before selecting the
cable, fuse and switch.
6.3 Pipe length and the elevation
Models
Pipe size
Gas Liquid
MSMBB-12CRDN1-MP0W+MOB1-12CDN1-M P0W
3/8in
(Ф9.52mm)
1/4in
(Ф6.35mm)
MSMBC-18CRDN1-MP0W+MOC-18CDN1-M P0W
1/2in
(Ф12.7mm)
1/4in
(Ф6.35mm)
MSMBD-22CRDN1-MP5W+MOF1-22CDN1-
M P5W
5/8in
(Ф15.9mm)
3/8in
(Ф9.52mm)
Models
Standa
rd
length
Max.
Elevation
Max.
Length
A
Additional
refrigerant
MSMBB-12CRDN1-MP0W+
MOB1-12CDN1-M P0W
7.5m
(24.6ft)
10m
(32.8ft)
25m
(82.0ft)
15g/m
(0.16oz/ft)
MSMBC-18CRDN1-MP0W+
MOC-18CDN1-M P0W
7.5m
(24.6ft)
20m
(65.6ft)
30m
(98.4ft)
15g/m
(0.16oz/ft)
MSMBD-22CRDN1-MP5
W+MOF1-22CDN1-M
P5W
7.5m
(24.6ft)
20m
(65.6ft)
30m
(98.4ft)
30g/m
(0.32oz/ft)
13
6.4 Installation for the first time
Air and moisture in the refrigerant system have
undesirable effects as below:
● Pressure in the system rises.
● Operating current rises.
● Cooling or heating efficiency drops.
● Moisture in the refrigerant circuit may
freeze and block capillary tubing.
● Water when mixed with the refrigerant and oil
will create an acid that will damage the motor
windings and components in the refrigerant
system.
Therefore, the indoor units and the pipes
between indoor and outdoor units must be leak
tested and evacuated to remove gas and
moisture from the system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral
detergent on the indoor unit connections or
outdoor unit Connections with a soft brush to
check for leakage of the connecting points of
the piping. If bubbles come out, the pipes have
leakage.
1. Air purging with vacuum pump
1) Completely tighten the flare nuts of the
indoor and outdoor units, confirm that both
the 2-way and 3-way valves are set to the
Front seated.
2) Connect the low pressure gauge to the 3 way
service valve access port..
3) Connect the middle hose of the gauge
manifold (usually yellow) to the vacuum
pump.
4) Fully open the handle for the low pressure
gauge..
5) Start the vacuum pump and operate according
to manufacture spec's.
6) Perform an evacuation for a minimum of 30
minutes and check that the low pressure
(compound) gauge indicates a vacuum of 29.9
in/hg (500 microns) A vacuum gauge should
be used if available. If the proper vacuum
cannot be achieved the vacuum pump should
be run for an additional 20 minutes. If after the
additional 20 minutes the vacuum still cannot
be achieved the is a leak in the system and
must be located and repaired. follow the leak
checking procedure as mentioned before. If
the vacuum is achieved, close the low pressure
gauge handle off and shut the vacuum pump
off. Recheck the reading after 10 minutes, the
vacuum may change slightly, this is normal.
7) The system is now dry and free of
contaminates, refrigerant pressure should
now be added to the system from a source
other than the system before opening the 2
way and 3 way valves for system operation.
8) The 2 way and 3 way valve can now be
opened for the system operation
2. Air purging by refrigerant
Procedure:
1). Confirm that both the 2-way and 3-way
valves are set to the closed position.
2). With a container of refrigerant and a gauge
manifold set, connect the low pressure gauge hose
14
to the 3 way valve service port and a charging
cylinder to the service port of the 3-way valve.
3). Open the valve on the refrigerant container and
the low pressure gauge to allow the refrigerant to
enter the system, next loosen the flare connection
on the 2 way valve line to purge the air and
contaminants from the system for 30 to 50
seconds, then retighten the connection.
4). Next allow the pressure from the refrigerant to
reach 100 psi and then close the low pressure
gauge and the refrigerant container and check the
2 way and 3 way valve line connections for leaks
with liquid soap or electronic leak detector.
5). After the system has been check for leaks the
pressure should be adjusted to about 25 to 50 psi.
6). You can now disconnect the gauge manifold
and refrigerant container from the system and
open the 2 way and 3 way valves for system
operation
7). Mount the valve stems nuts and the service
port cap.
Be sure to use a torque wrench to tighten the
service port cap to a torque 18N·m(13.27 ft.lbs).
Be sure to check the gas leakage.
6.5 Adding the refrigerant after running
the system for many years
Procedure
1). 1st step; Connect the low pressure gauge from
the gauge manifold set to the 3 way service valve
(this is the blue hose on most sets) 2nd step;
Connect the middle hose from the manifold set to
the refrigerant container (this is the yellow line on
most sets). with refrigerant 410A the container
must be inverted (upside down) when adding the
refrigerant. Note that the 2 way and 3 way valves
must be in the open position.
3rd step; the air in the gauge hoses needs to be
purged out. use the pressure from the system to
purge the low side line, loosen the connection on
the manifold for a second, next open the to valve
on the refrigerant container to pressurize the line,
now loosen that hose at the manifold for a second
and purge that line.
3) Next step is to set the refrigerant container on
an electronic charging scale and record the weight
or zero the scale depending on the scale used.
Next determine the refrigerant charge to be
added.
4) Start the unit in the cooling mode and lower the
set point so the unit wont shut off during the
charging procedure.
5) Refrigerant can now be added to the system,
open the low pressure valve on the gauge manifold
set to start charging the unit with liquid refrigerant,
keep track of the refrigerant being added to the
system (do not overcharge the system)
6). Once the correct charge has been added to the
system close the low pressure valve on the gauge
manifold set and record the operating pressure.
The system is now charged and the unit can be
shut off. Close the valve on the refrigerant
container and disconnect the hose from the
manifold set, also disconnect the hose from the 3
way valve and replace and torque all caps.
7). Mount the valve stem caps and the service
port
Use torque wrench to tighten the service port
cap to a torque of 18N.m(13.27 ft,lbs).
Always leak check after servicing the refrigerant
system.
6.6 Procedure when servicing the indoor
unit refrigeration circuit.
1. Pumping down the system (isolating the
refrigerant charge in the condensing unit)
15
Procedure
1). With the unit in the cooling mode and a low set
point remove all caps from the 3 way and 2 way
valves, next attach the low pressure gauge to the 3
way service valve port and purge the air from that
hose by loosening the hose at the manifold for a
second, be sure the low pressure gauge valve is
closed. be sure to record the operating
pressure, you will need to know this when you
complete the service on the indoor unit and restart
the system. Now prepare to close both valves on
the unit starting with the 2 way valve (this is called
front seating the valve) also prepare to shut the
power off to the outdoor unit.
2). Connect the charge hose with the push pin
of handle lo to the 3-way valves gas service
port.
3). Air purging of the charge hose.
Open the handle Lo valve of the manifold valve
slightly to purge air from the charge hose for 5
seconds and then close it quickly.
4). Now close the 2 way valve and monitor the low
pressure gauge. the pressure will start to drop.
5). Operate the unit in the cooling mode and
disconnect the power to the outdoor unit when the
low side gauge reads a slight vacuum, running the
compressor in a vacuum could damage the motor
windings. Note that units with extended lines and
additional refrigerant charge may not be able to
achieve a vacuum, this is because the outdoor
unit can only store a certain amount of refrigerant,
this is normal (the amperage of the compressor
will have to be monitored in this case) Stop
compressor when the amperage approaches the
name plate FLA rating indicates 0.1Mpa(14.5Psi).
6). Now close the 3 way valve right away. the
pressure will rise during this time, this is normal.
There will be some pressure left in the system this
is normal, The indoor unit is now ready to be
serviced.
Disconnect the charge set, and tighten the
2-way and 3-way valve’s stem nuts.
Use a torque wrench to tighten the 3-way valves
service port cap to a torque of 18N.m(= 13.27
ft.lbs).
Be sure to check for gas leakage.
2. Sweeping (air purging) the system with
refrigerant after the service to the
refrigerant circuit of the indoor unit is
complete.
Procedure:
Sweeping the system can be used when the unit
has been pumped down, this eliminates the need
to loosen the flare connection on the 2 way valve
(loosening and retightening flare connections
could cause a refrigerant leak)
1). Confirm that both the 2-way and 3-way
valves are set to the closed position.
2). Connect the charge set and a charging
cylinder to the service port of the 3-way valve
Leave the valve on the Refrigerant container.
3). Do not loosen the flare connection, Start with
the hose from the low pressure gauge that has
been connected to the 3 way valve service port
and loosen it at the gauge manifold connection,
next open the 2 way valve 1/2 half of a turn (this
will release the refrigerant that has been isolated in
the outdoor unit) The refrigerant will travel thru
the small refrigerant line and evaporator coil in the
indoor unit and back out the low pressure hose
that has been loosened let the refrigerant sweep
for about 50 seconds, this will push and remove
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any air moisture and noncodensables from the
refrigeration circuit. After 50 seconds has passed
tighten the hose on the low pressure gauge. The
sweep is now complete.
Next step, open the 2 way valve all the way then
the 3 way valve all the way and check for leaks.
4). Next step, Start the unit in the cooling mode
and check the pressure (remember the pressure
you recorded?) The unit is going to be low on
refrigerant from the sweeping process, add
refrigerant as needed from the refrigerant
container in the liquid state to achieve the
operating pressure that you recorded. The process
is now complete.
Check the flare connections for gas leakage.
5). Discharge the refrigerant.
Close the valve on the charging cylinder and
discharge the refrigerant by loosening the flare
nut on the 2-way valve approximately 45’ until
the gauge indicates 0.3Mpa(43.5Psi) to 0.5
Mpa(72.5Psi).
6). Disconnect the charge set and the charging
cylinder, and set the 2-way and 3-way valves to
the open position
Be sure to use a hexagonal wrench to operate
the valve stems.
7). Mount the valve stems nuts and the service
port cap
Be sure to use a torque wrench to tighten the
service port cap to a torque 18N.m.
Be sure to check the gas leakage.
6.7 Evacuation after servicing the outdoor
unit refrigeration circuit.
1. Evacuation of the complete refrigeration
circuit, Indoor and outdoor unit.
Procedure:
1). Confirm that both the 2-way and 3-way
valves are set to the opened position.
2). Connect the vacuum pump to 3-way valve’s
service port.
3). Evacuation for approximately one hour.
Confirm that the compound meter indicates
-0.1Mpa(14.5Psi), 500 Microns / 29.9 in,hg.
4). Close the valve (Low side) on the charge set,
turn off the vacuum pump, and confirm that the
gauge needle does not move (approximately 5
minutes after turning off the vacuum pump).
5). Disconnect the charge hose from the
vacuum pump.
2. Refrigerant charging
Procedure:
1). Connect the charge hose to the charging
cylinder, open the 2-way valve and the 3-way
valve
Connect the charge hose which you
disconnected from the vacuum pump to the
valve at the bottom of the cylinder. If the
refrigerant is R410A, make the cylinder bottom
up to ensure liquid charge.
2). Purge the air from the charge hose
Open the valve at the bottom of the cylinder
and press the check valve on the charge set to
purge the air (be careful of the liquid
refrigerant).
3) Put the charging cylinder onto the electronic
scale and record the weight.
4). Open the valves (Low side) on the charge
set and charge the system with liquid refrigerant
If the system cannot be charge with the
specified amount of refrigerant, or can be
17
charged with a little at a time (approximately
150g each time) , operating the air conditioner
in the cooling cycle; however, one time is not
sufficient, wait approximately 1 minute and then
repeat the procedure.
5).When the electronic scale displays the
proper weight, disconnect the charge hose from
the 3-way valve’s service port immediately
If the system has been charged with liquid
refrigerant while operating the air conditioner,
turn off the air conditioner before disconnecting
the hose.
6). Mounted the valve stem caps and the
service port. Use torque wrench to tighten the
service port cap to a torque of 18N.m. Be sure
to check for gas leakage.
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7. Operation Characteristics
Temperature
Mode
Cooling operation Heating operation Drying operation
Room temperature
17℃～32℃
(62℉～90℉)
0℃～30℃
(32℉～86℉)
10℃～32℃
(50℉～90℉)
Outdoor temperature
0°C～50°C
(32°F～122°F)
-15°C～30°C
(5°F～86°F)
0°C～50°C
(32°F～122°F)
-15°C～50°C
(5°F～122°F)
(For the models with
low temperature cooling system)
!"(#)
$
+32
CAUTION:
1. If the air conditioner is used beyond the above conditions, certain safety protection features may
come into operation and cause the unit to operate abnormally.
2. The room relative humidity should be less than 80%. If the air conditioner operates beyond this
figure, the surface of the air conditioner may attract condensation. Please set the vertical air flow louver to
its maximum angle (vertically to the floor), and set HIGH fan mode.
3. The optimum performance will be achieved during this operating temperature zone.
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8. Electronic function
8.1 Abbreviation
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
8.2 Display function
8.2.1 Icon explanation on indoor display board.
Digital display:
Displays the temperature settings when the air
conditioner is operational.
Displays the room temperature in FAN mode.
Displays the self-diagnostic codes.
Dispalys ‘ ’ for three seconds when Timer
ON, Fresh, Swing, Turbo or Silence feature is
activated.
Dispalys ‘ ’ for three seconds when Timer
OFF is set.
Dispalys ‘ ’ for three seconds when Fresh,
Swing, Turbo or Silence feature is cancelled.
Dispalys ‘ ’ under deforsting operation.
Dispalys ‘ ’ when anti-cold air feature is
activated under heating mode.
Dispalys ‘ ’ during self clean operation (if
aplicable).
Dispalys ‘ ’ under 8℃ heating operation (if
aplicable).
When ECO function(optional) is actived,the
“ ” illuminates gradually one by one as
In one second interval.
WIFI control display(optional)
Displays when the WIFI control feature is
acticated.(Not available when the unit does not
have this function)
NOTE:
A guide on using the infrared remotr is included
in this literature package.
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