8.9 Gas charging......................................................................................................................................29
11.13. Auto restart function...........................................................................................................................39
14 Characteristic of temperature sensor.............................................................................50
3
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Service manual
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 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.
nAlways 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.
nAlways install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric
shock.
nUse the correctly rated breaker of fuse.
There is risk of fire or electric shock.
nDo 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.
There is risk of fire, electric shock, explosion, or injury.
n Do not install the product on a defective installation
stand.
It may cause injury, accident, or damage to the product.
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
windows is left open.
Moisture may condense and wet or damage furniture.
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.
nDo not place anything on the power cable.
1
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.
nDo not touch (operation) the product with wet hands.
There is risk of fire or electric shock.
n Do not place a heater or other appliance near the
power cable.
There is risk of fire and electric shock.
nDo not allow water to run into electric 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.
Do not use the telephone or turn switches on or off.
There is risk of explosion or fire.
n If strange sounds, or small or smoke comes from
product. Turn the breaker off or disconnect the
power supply cable.
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 (flooded or submerged),
contact an Authorized service center.
There is risk of fire or electric shock.
nBe 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.
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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.
nKeep level even when installing the product.
To 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.
Avoid personal injury.
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
periods of time. (Do not sit in the draft).
This could harm to your health.
n Do not use the product for special purposes, such
as preserving foods, works of art, etc. It is a
Service manual
consumer air conditioner, not a precision refrigerant
system.
There is risk of damage or loss of property.
nDo not block the inlet or outlet of air flow.
It may cause product failure.
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.
There is risk of personal injury.
n Do not step on pr put anything on the product.
(outdoor units)
There is risk of personal injury and failure of product.
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 object through air inlet
or outlet while the product is operated.
There are sharp and moving parts that could cause
personal injury.
nDo not drink the water drained from the product.
It is not sanitary could cause serious health issues.
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 mew
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.
The chemical in batteries could cause burns or other
health hazards.
2
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Service manual
2. Function
Indoor unit
Operation ON/OFF by remote controller
Sensing by room temperature
Room temperature sensor.
Pipe temperature sensor.
Room temperature control
Maintain the room temperature in accordance with the setting temperature.
Anti-freezing control in cooling
Prevent the water being freezed on evaporator by sensing
the evaporator pipe temperature in cooling mode
Time Delay Safety control
Restarting is for approx. 3 minutes..
Indoor fan speed control
Turbo wind, high, med, low, breeze.
Two-direction air vane
The unit will decide the louver direction according to operation mode.
Sleep mode auto control
The fan is turn to low speed (cooling/heating).
The unit will be turn off at the seventh hour.
Independent dehumidification
The function is usually used in rainy days in
springtime or damp areas.
Work voltage (160v-253v)
High efficiency (30%)
Tele Remote control (Optional)
Self-diag. function
Anti-cold function
Prevent the cold wind at
the beginning of unit start.
Auto defrost
Auto-restart function
Air flow Direction control
The louver can be set at the desired position or swing up and
down automatically
Auto mode
The mode can be change by the room temperature.
Temp. Compensation
3
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When the power supply is interrupted and then
restore, the air conditioners automatically
restore the previous function setting.
Flexible wiring connection
DSP High-speed Chip
Driving heating at -15℃
Service manual
Outdoor unit
Power relay control
The unit has 3 mins delay between continuously ON/OFF operations.
Low noise air flow system
Bird tail propeller fan makes the outdoor unit run more quietly.
Hydrophilic aluminum fin
The hydrophilic fin can improve the heating efficiency at operation mode.
4 way valve control
It is only operated in the heating operation mode except defrosting operation.
Anti-rust cabinet
Made from electrolytic zinc steel sheet and anti-rust coated components.
Valve protection cover
It protects the valves and prevents water from dripping.
Discharge pipe temperature protect
4
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Indoor air temp. ℃ DB
Note: The chart is the result from the continuous operation under constant air temperature conditions.
However, excludes the initial pull-down stage.
6.2 Heating operation
Indoor air temp. ℃ DB
Outdoor unit air temp.℃ DB
Note: The chart is the result from the continuous operation under constant air temperature conditions.
However, excludes the initial pull-down stage.
13
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Service manual
7. Schematic diagram and Wiring diagram
7.1. Schematic diagram
7.1.1 Display board(MSH-18HRIN1,MSC-18HRIN1)
D
C
B
FROM INDOOR PCB
IC1
1
Dsa
Vcc
2
Dsb
Q7
3
Q0
Q6
4
Q1
Q5
5
Q2
Q4
6
Q3
MR
GND7CP
74HC164
R11 391
R12 391
R13 391
CN1
8LED
7
6
CLK
5
DATA
4
+5
DIGI
3
+5V
2
REMOTE
1
GND
47u/16V
R1 102
+5
E2
C3
C6
R6
221
104
102
R5
102
Q2
9013
R4221
+5
R3221
R2102
Q3
9012
R14 391
Q1
9012
g
dig.1cba
f
d dp e
+5
104
C1
14
13
12
11
10
9
8
R9 221
R17 221
R15 221
R16 391
DISP1
dig.2
654321
+5
R7
221
R8
102
E4
C5
10u/16V
104
Q4
9012
LED2
AUTO G
TIME Y
LED3LED1
DEF R
DISP2
+5
R10
151
REC1
D
C
B
A
123456
7.1..2 Indoor main PCB(MSH-18HRIN1,MSC-18HRIN1)
CN1
1
2
3
4
14.5VAC 350mA
TRANS_OUT
14.5VAC 200mA
5
FAN_IN
CN5
4
3
2
1
D
C
A
B
C25
1.2(1.5)uF/450V
D1
D2
D3
D4
D6
D7
D8
D9
R2 51/1W
IN4007*4
IN4007*4
L1
2200uF/25V
1000uF/25V
C2 333/250VAC
T1T2
R1
2K
E1
E5
TR1
DZ2
BT131
12V
R11
G
100K
4
IC1 PC817
3
IC2 7812+12V
1
Vin
Vout
C3
GND
104
1000uF/25V
2
IC7 7812ISO+12V
1
Vin
Vout
C8
GND
104
470uF/25V
2
C12
104
1
+5V
2
3
E3
3
E2
470uF/25V
R4
R5
11K/2W
11K/2W
R3
INDOORFAN'
560
IC3 7805+5V
1
Vin
C4
104
E6
C9
104
ISOGND
L
C5
D5
IN4007
GND
2
C1
P-1
1
472
GND
14D681K
333/250VAC
N
PTC1
t
82RM
12CN2
3
Vout
C11
E4
104
470uF/16V
POWER CIRCUIT
1
R18
5.1K
C14
C16
D10
IN4007
B
IN4749
+5V
R33
10K
A
102
471/250V
R17
2K/2W
DZ1
24V
CN8
SELECT1
J1
4
R20
11K/2W
C13
R19
100K
473
E9
100uF/35V
1
S
+5V
R31
10K
+5V
PC817
IC6
4
3
2
IC10 PC851
1
R22
12K
23
R21
11K/2W
D11
L
CN9
N
1
2
IN4007
COMMUNICATE CIRCUIT
SELECT2
J2
R43
RXD
R23
5.1K
CN10
1
2
+5V
R32
10K
J3
1K
+5V
C15
102
R24
680
Q2
9013
R26
TXD
2K
R25
5.1K
+5V
SELECT3
FAN_BACK
C20
103
ZR1
TRANS_IN
CN10
FUSE1
1
L
3.15A/250V
2
CN9
1
N
2
X1
R10
1M
2.5M
+5V
C10
E7
104
100uF/16V
A
D141N4007
D131N4007
B
D15
IN4148
CN13
3
R34
2
1
5.1K
FAN_BACK
SW1
+12V
STEP1
STEP2
STEP3
STEP4
INDOORFAN
CHUCHEN
CORTROL CIRCUIT
IC8
17
TXD
18
RXD
19
CLK
20
LED_CDATA
21
22
RST
23
24
25
26
INDOORFAN
27
BUZZ
28
STEP1
29
STEP2
30
STEP3
31
STEP4
32
DIGI_C
R38
12K
R37
12K
+5V
R35
10K
SW_KEY
C21
104
P21
P22
P23
P24
VPP
RESET
X2
X1
VDD
P25
P26
P00
P01
P02
P03
P04
uPD789189(32P)
+5V
R39
12K
R405.1K
C22
223
T2_pipe
P20
P33
P32
P31
P30
P11
P10
VSS
ANI3
ANI2
ANI1
ANI0
P53
P52
P51
Q3
9013
CN11
2
1
R36
8.06K
Size FCSM No.DWG No.Rev
B
ScaleSheet
IC4
1
16
IN1
OUT1
2
15
IN2
OUT2
3
14
IN3
OUT3
4
13
IN4
OUT4
5
12
IN5
OUT5
BUZZ
6
11
IN6
OUT6
C7
104
FAN_BACK
ZERO
SDA
SCL
T2_pipe
T1_room
ZERO
IN7
VSS8VDD
IC/ULN2003
R272K
INDOORFAN'
10
OUT7
9
R7
1K
R6
2K
RST
T2_pipe
C17
223
7
+12V
16
CHUCHEN
15
14
13
12
REMOTE
11
10
9
8
7
6
5
4
SW_KEY
3
SELECT3
2
SELECT2
1
SELECT1P50
C23
223
+5V
E12
47uF/16V
CN8
DIGI_C
T1_room
1
2
3
4
5
4
1
C26
104
CLK
REMOTE
CN4
SCL
SDA
CN14
8.06K
R8
1K
IC5
2
1
R41
+12V
+5V
R28
10K
PC817
E8
47uF/16V
LED_C
DATA
+5V
3
2
1
R29
10K
+5V
47uF/16V
0 of 0
B1
1
R9
5.1K
2
ISO+12VISOGND
IC9
7042
3
R13
10K
+5V
R14
R15
10K
10K
C18
102
IC11 24C04
8
VCC
7
WC
6
SCL
5
R42
2K
E11
R16
10K
R30100
2
1
GND4SDA
A0
A1
A2
C24
C19 104
223
87654321
ISO+12V
9013
CN7
7
6
5
4
3
2
1
DISPLAY
E10100uF/16V
1
2
3
T1_room
A
1
D
2 CN12
1
2 CN6
Q1
+5V
C
B
A
12345678
14
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Service manual
7.1.3 Outdoor main PCB(MSH-18HRIN1,MSC-18HRIN1)
654321
D
C
B
Outdoor Entironment Sensor
CN2
Outdoor Pipe Sensor
A
123456
CN1
Compress Top
2
1
CZ2
+5V
2
1
D5
AC-IN
+5V
2
1
R13
+5
10
Pro
C25
9
+12
8
C4
7
6
U+
5
U-
4
V+
3
V-
2
W+
1
W-
L4
R18
R7
R8
C7
+5V
D2
R11
C17
CN4
C22 C20
R15
R6
R5
R4
R3
R2
R1
LED
R10
+5V
R9
4148
D3R21
Current Detect
R12
CT1
2
1
C21
+5
OUT-TEMP
R14
EVP
C8R12
+5V
1
VDD
C6
2
VSS
3
4
5
PD0
6
CAP3/IOA5
7
IPM
Pro
R31
R22
R34
C9
CAP2/QEP1/IOPA4
8
CAP1/QEP0/IOPA3
VDD
9
+5V
10
VSS
11
C1
12
13
VSSA
14
VDDA
15
ADCIN07
16
VREFHI
17
VREFLO
ADCIN06
18
ADCIN05
19
20212223242526
ADCIN04
C10
C11
C19
R33
+5
IC1
1
2
3
C12
IOPC7
IOPC6
ADCIN03
R23
TP2
TP1
Vccp
TMS320F242
(64QFP)
ADCIN02
ADCIN01
ADCIN00
R24
+5V
C13
PWM1/PA6
NC
LED
PWM2/PA7
27282930 3231
Vss
/RESET
LED
+5V
R29
C23
+5V
R30
52535455565758596064636261
VDD
Vss
51
Vdd
VSS
VDD0
50
PTM
49
IOPC5
PWM3/PB0
PWM4/PB1
PWM5/PB2
48
IOPC4
47
IOPC3
46
IOPC2
45
SCIRX/IOPA1
44
SCITX/IOPA0
43
IOPC1
42
VDD
41
VSS
40
IOPC0
39
EMU1
38
EMU0
37
XTAL2
36
XTAL1
35
VDD
34
VSS
33
R25
TCK
TDI
TDO
TMS
/TRST
+5
CN10
12345678910
1112
1314
7.1.4 Outdoor power PCB(MSH-18HRIN1,MSC-18HRIN1)
D
R32
IC2
FAN'
FAN
4-WAY
RXD
TXD
POWER
+5V
+5
C14
+5
R36
1 2
4-WAY'
3 4
5 6
7 8
9 10
11 12
13 14
15 16
+5V
R16
XTAL1
R35
+12V
J3(Comm Select)
C16C15
CN1
AC-IN
11
AC-IN
10
FAN'
9
8
4-WAY'
7
GND
6
TXD
5
RXD
4
+5V
3
+12V
2
POWER1
1
CON11
link to power circuit
C
B
A
4321
D
L
Filter
N
FS1
20A/250VAC
474/250V
H38-20A-6MH
C1
14D681
T1
ZMR2
14D681
FS2
3.15A/250VAC
ZMR1
474/250V
C5
C2
472
C4
472
AS1
t
PTC1
RL3-4
L3
AC V+
POWER1
R18J04D
AC V-
DB1
+12V
RL3
P-2
P-1
DB2
AC V+
AC V-
R8025
L2
R1812
L1
C6
50uF/450V
P-5
103
P-6
560uF/400V *6
C84C7
C81C85C83C8
C82C86
P-4
103
P-3
C
D
IPM BOARD
C
T3
CN1
11
AC-IN
10
H.FAN
9
L.FAN
8
4-WAY
7
GND
6
TXD
POWER1
CON11
5
4
3
2
1
RXD
+5V
+12V
POWER1
+12V
+5
TXD
RXD
+5V
IC5 PC851
23
1
12K
PC817
IC6
3
4
R30
3.5K/7W
4
C23
471/250V
D1
IN4007R28
+12V
RL2
C15
2.5U
S
2
R26
C21
5.1K
104
1
RL1
B
A
1234
CN4
FAN.H
CN7
CAP
CN5
COM
CN6
4-WAY
B
FAN
4-WAY
A
Power Circuit
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7.1..5 Indoor main PCB(Inverter Eco)
Service manual
16
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7.1.6 Outdoor main PCB(Inverter Eco/Elite)
Service manual
17
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7.2. Wiring diagram
7.2.1 MSH-18HRDN1
Service manual
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7.2.2 MSC-18HRIN1
Service manual
19
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7.2.3 MSE-09HRIN2, MSE-12HRIN2
Service manual
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Service manual
7.2.4 MSG-07HRIN2, MSG-09HRIN2, MSG-12HRIN2
1 Indoor unit 7/9K
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 7K 9K 12K 16K 18K
mm2 1.0 1.0 1.5 2.5 2.5
8.3 Pipe length and the elevation
Capacity
Btu/h
Pipe size
GAS LIQUID
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Elevation
B (m)
Additional
refrigerant
(g/m)
7k~12K
3/8’’ (φ9.52) 1/4’’ (φ6.35) 5 5 10 30
1/2’’ (φ12.7) 1/4’’ (φ6.35) 5 5 10 30
1/2’’ (φ12.7) 1/4’’ (φ6.35) 5 8 15 30
5/8’’ (φ15.88) 1/4’’ (φ6.35) 5 10 20 30 18K~28K
5/8’’ (φ15.88) 3/8’’ (φ9.52) 5 10 20 65
In case that
more than 5m.
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be install per 5-7 meters.
23
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Service manual
8.4 Air purging of the piping and indoor unit
Required tools:
Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector.
Note:
The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will
affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.
Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it
prevents the gas leakage from the refrigeration cycle.
Procedure
1. Recheck the piping connections.
2. Open the valve stem of the 2-way valve
counterclockwise approximately 90’, wait
10 seconds, and then set it to closed
position.
§ Be sure to use a hexagonal wrench to operate
the valve stem
3. Check for gas leakage.
§ Check the flare connection for gas leakage
4. Purge the air from the system.
§ Set the 2-way valve to the open position and
remove the cap from the 3-way valve’s
service port.
§ Using the hexagonal wrench to press the
valve core pin, discharge for three seconds
and then wait for one minute.
5. Use torque wrench to tighten the service
port cap to a torque of 1.8 kg.m. (18n.m)
6. Set the 3-way valve to the opened
position.
7. Mounted the valve stem nuts to the 2-way
and 3-way valves.
8. Check for gas leakage.
§ At this time, especially check for gas leakage
from the 2-way and 3-way stem nuts, and
from the service port.
Caution:
If gas leakage is discovered in step (3) above,
take the following measures.
If the leaks stop when the piping connections are
tightened further, continue working from step (4).
If the gas leaks do not stop when the connections
are retightened, repair the location of the leak,
discharge all of the gas through the service port,
and then recharge with the specified amount of
gas from a gas cylinder.
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8.5 Pumping down (Re-installation)
Service manual
Procedure
1. Confirm that both the 2-way and 3-way valves are set to the opened position.
§ Remove the valve stem caps and confirm that the valve stems are in the opened position.
§ Be sure to use a hexagonal wrench to operate the valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then connect the charge set to the service port of the
3-way valve.
§ Connect the charge hose with the push pin to the gas service port.
4. Air purging of the charge hose.
§ Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
5. Set the 2-way valve to the close position.
6. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
7. Immediately set the 3-way valve to the closed position.
§ Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
8. Disconnect the charge set, and amount the 2-way and 3-way valve’s stem nuts and service
port caps.
§ Use a torque wrench to tighten the service port cap to a torque of 1.8 kg.m.
§ Be sure to check for gas leakage.
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8.6 Re-air purging (Re-installation)
Service manual
Procedure:
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 charging cylinder closed.
3. Air purging.
§ Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut
on the 2-way valve approximately 45’ for 3 seconds then closing it for 1 minutes; repeat 3 times.
§ After purging the air, use a torque wrench to tighten the flare nut to on the 2-way valve.
4. Check the gas leakage.
§ Check the flare connections for gas leakage.
5. Discharge the refrigerant.
§ Close the valve on the charging cylinder and discharge the refrigerant until the gauge indicate 0.3 to
0.5 Mpa.
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.
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Service manual
8.7 Balance refrigerant of the 2-way, 3-way valves
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the open position.
2. Connect the charge set to the 3-way valve’s service port.
§ Leave the valve on the charge set closed.
§ Connect the charge hose with the push pin to the service port.
3. Open the valves (Low side) on the charge set and discharge the refrigerant until the gauge
indicates 0.05 to 0.1 Mpa.
§ If there is no air in the refrigeration cycle [the pressure when the air conditioner is not running is
higher than 0.1Mpa, discharge the refrigerant until the gauge indicates 0.05 to 0.1 Mpa. If this is the
case, it will not be necessary to apply a evacuation.
§ Discharge the refrigeration gradually; if it is discharged too suddenly, the refrigeration oil sill be
discharged.
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8.8 Evacuation
Service manual
Procedure:
1. Connect the vacuum pump to the charge set’s centre hose.
2. Evacuation for approximately one hour.
§ Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less].
3. 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).
4. Disconnect the charge hose from the vacuum pump.
§ Vacuum pump oil, if the vacuum pump oil becomes dirty or depleted, replenish as needle.
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8.9 Gas charging
Service manual
Procedure:
1. Connect the charge hose to the charging cylinder.
§ Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom
of the cylinder.
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. 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, if can be charged with a little
at a time (approximately 150g each time0 while operating the air conditioner in the cooling cycle;
however, one time is not sufficient, wait approximately 1 minute and then repeat the
procedure.(pumping down-pin).
4. Immediately disconnect the charge hose from the 3-way valve’s service port.
§ Stopping partway will allow the refrigerant to be discharged.
§ If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the
air conditioner before disconnecting the hose.
5. 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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Service manual
12ºC D
7ºC D
-4ºC D
12ºC D
7ºC D
-4ºC D
§
9. Pressure table
Note:
The pressure data is from 3 way valve, the pressure data are pressure above atmosphere.
D: Dry bulb temp.
W: Wet bulb temp.
This indicator illuminates when the air conditioner starts defrosting automatically or when the warm
air control feature is activated in heating mode.
11.1.4. TEMPERATURE indicator
Usually it displays the temperature settings. When change the setting temperature, this indicator
begins to flash, and stops 20 seconds later.
It displays the room temperature when the air conditioner is in FAN only operation.
When the unit stops operation, it returnsto original factory settings.
Displays the malfunction code or protection code.
11.1.5. OPERATION indicator
This indicator flashes after power is on and illuminates when the unit is in operation.
11.1.6. FREQUENCY indicator
This indicator appears only when the compressor is in operation and indicates the current operating
frequency.
3
4
5
6
11.2. Protection
11.2.1. 3 minutes delay at restart for compressor.
11.2.2. Temperature protection of compressor top, compressor stops when the temp. of top of
compressor is more than 115℃, compressor runs when the temp. of top of compressor is less than
100℃.
11.2.3. Voltage protection, unit stop when the voltage is more than 260V and less than 175V.
11.2.4. Inverter module Protection, Inverter module Protection itself has a protection function against
current, voltage and temperature.
11.2.5. Sensor protection at open circuit and breaking disconnection
11.2.6. Fan Speed is out of control. When Indoor Fan Speed is too high(higher than 2100RPM)or too
low(lower than 300RPM), the unit stops and LED displays failure information and can’t returnto
normal operation automatically.
11.2.7. Cross Zero signal error warning. If there is no Cross Zero signals in 4 minutes, the unit stops
and LED displays failure information and can’t return to normal operation automatically.
11.3. Fan-only mode
Fan speed is high/mid/low/ Auto
11.4. Cooling mode
11.4.1. The 4-way valve is closed at cooling mode.
11.4.2. The action of the compressor and the outdoor fan:
Condition
T=Indoor Temp.
T> Ts+1 On On Room temp. up
T<Ts+1 Off Off
T> Ts On On Room temp. down
T<Ts Off Off
11.4.4 Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. )
Evaporator Temp. Compressor
0℃<T< 4℃Decrease frequency of compressor
T< 0℃Off
11.4.5 Current protection
Model Current Compressor
Current up MSH-18HRIN1
Current down MSH-18HRIN1
I>18 A Off
14.5A<I<18A Decrease frequency of
compressor
I< 12.0A On
I>17.5 A Off
14.0A<I<17.5A Decrease frequency of
compressor
I< 11.5A On
11.4.6 Rated capacity test
Set mode to cooling mode
Set temp. to 17°C
Set fan speed to high speed
Push turbo button 5 times in 10 seconds.
Using special remoter controller
After 5 hours, cancel rated capacity test
Turbo function
Increasing frequency of compressor
After operating 30 minutes, return automatically to the mode and temp. previously selected.
11.5. Dehumidifying mode
11.5.1 The 4-way valve is off
11.5.2 the indoor fan is fixed in breeze speed
11.5.3 Compressor run in low frequency
11.5.4 Low room temperature protection:
11.5.5 When room temperature decreases to below 10℃, compressor and outdoor fan will stop
(indoor fan is Breeze). Dehumidifying operation will be resumed when room temperature restores to
over 12℃.
11.5.6 At dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the same as
that of cooling mode.
11.6. Heating mode
11.6.1. Generally, the 4-way valve is open at heating mode, but it is closed at defrosting. 4-way valve
must delay 2 minutes compared with compressor if the compressor changed into non-heating mode
or turned off. 4-way valve doesn't delay in dehumidifying mode.
11.6.2. Generally, the outdoor fan is turned off with the on-off action of compressor in heating mode,
except for the defrosting mode or the end of defrost.
11.6.3. Action of compressor and outdoor fan motor at heating mode: compressor must run for 7
minutes after starting and then judge temperature. Meanwhile other protections are still valid.
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Service manual
Condition Compressor Outdoor fan
T> Ts+3 Off Off Room temp. up
T<Ts+3 On On
T< Ts+2 On On Room temp. down
T>Ts+2 Off Off
11.6.4. Indoor Fan actions at heating mode
Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller, but Anti-cold wind function
prevails.
Anti-cold wind control function at heating mode
Condition (T= Indoor exchanger temp.) Indoor fan speed
Indoor exchanger temp. up
Indoor exchanger temp. down
T<34℃Off
34℃<T<37℃Breeze
37℃<T<44℃Low speed
T>44℃Setting fan speed
T> 38℃Setting fan speed
33℃<T<38℃Low sped
24℃<T<33℃Breeze
T<24℃Off
When the indoor temp. gets to setting temp, indoor changes to breeze speed immediately, after 127
second, indoor fan stop.
11.6.5. Auto wind at heating mode
Condition (T=Indoor Temp.-Setting Temp.) Indoor fan speed
Room temp. up
Room temp. down
T<1.5℃High
1.5℃<T<2.5℃Med.
T>2.5℃Low
T<1.0℃High
1.0℃<T<2.0℃Med.
T>2.0℃Low
11.6.6. Indoor evaporator high-temperature protection at heating mode
Condition (T= Indoor exchanger temp.) Compressor
T<48℃On
53℃<T<63℃Decrease frequency of compressor
T>63℃Off
11.6.7. The current protection
Model Current Compressor
Current up 18000btu/h
Current down 18000btu/h
I>19.0 A Off
15.0.A<I<19.0A Decrease frequency of compressor
I< 12.5A On
I>18.5 A Off
14.5A<I<18.5A Decrease frequency of compressor
I< 12.0A On
11.6.8. The temp. compensation
Jump setting in indoor PCB
J2 On On Off Off
J3 On Off On Off
ΔT 0℃-4℃-2℃0℃
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11.7. Defrosting operation (Available for heating only).
11.7.1 Defrosting condition:
11.7.1.1.When outdoor temp. is more than 0℃,
Defrosting starts when meeting one of the following conditions,
a. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 40 minutes, and the temperature remains consecutively -4°c for more than 3 minutes,
b. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 80 minutes, and the temperature remains consecutively -2°c for more than 3 minutes
11.7.1.2.When outdoor temp. is less than 0℃,
Defrosting starts when meeting one of the following conditions,
a. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 40 minutes, and the temperature remains consecutively -6°c for more than 3 minutes,
b. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 40 minutes, and the temperature remains consecutively -6°c for more than 3 minutes,
c. The temperature of indoor unit pipe decreases 5°c than before
11.7.1.3.The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 120 minutes, and the temperature remains consecutively -2°c for more than 3 minutes
11.7.2 Ending condition of defrosting
If one of following conditions is satisfied, end the defrost and turn into heating mode:
a. The defrost time has reached to 10 minutes.
b. When the temperature of outdoor heat exchanger rises up to 8°C and this continues for more than 80
seconds.
c. When the temperature of outdoor heat exchanger rises up to 12°C
11.7.3 Defrosting Actions:
max. 10 minutes
60s
ON 10s 30s
Com. OFF
ON ON
4 way valve OFF
ON ON
Outdoor fan OFF
ON ON
Indoor fan
OFF
Breeze 10 seconds, then stop
11.7.4 Rated capacity test
Set mode to cooling mode
Set temp. to 30 °C
Set fan speed to high speed
Push turbo button 5 times in 10 seconds.
Using special remoter controller
After 5 hours, cancel rated capacity test
11.8. Outdoor low temperature protection (optional)
Factory standard unit has not this function.
Unit stops when outdoor temp. is low than -15°C and lasting time more than 60 minutes, and unit runs
again when outdoor temp. more than -12°C.
When indoor PCB J1 jump is on, this function is available.
11.9. Automatic operation mode
The air conditioner automatically selects one of the following operation modes: cooling, heating or fan
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Service manual
only according to the temp. difference between room temp. (TA) and set temp. (TS).
TA—TS Operation mode
TA—TS>2℃Cooling
-1℃≤TA-TS≤+2℃ Fan-only
TA-TS<-1℃Heating (air-only for cooling only type)
11.10. Manual switch
11.10.1 Mode changes when push this button .
Cooing modeà Auto modeàUnit offà Cooing mode
11.10.2 At Cooing mode, after 30 minutes cooling operation whose fan speed is set as low, the A/C
operates with a setting temp. of 24℃.
11.10.3 At auto mode, the A/C operates with a set temp. of 24℃
11.11. Timer Function
11.11.1 The maximum length of timer is 24 hours and the minimum resolving power is 15 minutes.
11.11.2 Timer on: first turn off the A/C, the A/C will be automatically on at the set time.
11.11.3 Timer off: first turn on the A/C, the A/C will be automatically off at the set time
11.11.4 Timer on/off function( on time is earlier than off time): first turn off the A/C, it will be
automatically on at set time, and later be off at the set time, then unit turns on at set time.
11.11.5 Timer off/on function( off time is earlier than on time): first turn on the A/C, it will be
automatically off at set time, and later be on at the set time, then unit turns off at set time.
11.12. Sleep mode
11.12.1 It is available at cooling, heating or auto mode.
11.12.2 Cooling:
The set temperature rise 1℃ per hour. Two hours later, the set temperature will maintain as a constant
and the fan speed is kept at low speed.
11.12.3 Heating:
The set temperature decrease 1℃ per hour. Two hours later, the set temperature will maintain as a
constant and the air circulation is kept at low speed (Cold air proof function takes precedence over all).
11.12.4 Auto:
The Sleep Mode running function operates in accordance with selected running mode by auto mode.
11.12.5 After 7 hours, unit cancels this modes automatically.
11.13. Auto restart function
In case of a sudden power failure, this function automatically sets the unit to previous settings before the
power failure when power returns.
11.14. Turbo function
The indoor fan will work in super high speed, the frequency of compressor will increase, the max run
time is 30 minutes. After 30 minutes, the unit will work in previous setting.
11.15. Plasma
Plasma turns on when the indoor fan runs.
Plasma turns off automatically when front panel is opened.
Plasma is optional function.
E1 Indoor / outdoor units communication protection
E2 Zero-crossing examination error
E3 Fan speed beyond control
E5 Open or short circuit of outdoor temperature sensor
E6 Room temperature or evaporator temperature sensor open or short circuit of
P0 Module protection
P1 Over voltage or too low voltage protection
P2 Compressor top protection against temperature
P3 Outdoor low temp. protection
P4 Inverter compressor drive error
Note: E4: Reserved function
13.1.1
Display LED STATUS
E0 EEPROM parameter error
Replace the control board of indoor
13.1.2 circuit or software error on indoor cortrol board
Display LED STATUS
E1 Indoor / outdoor units communication protection
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Disconnect the power supply, after 1 minutes, connect the power supply , turn on the
unit using remote controller, does the unit work normally ?
Does the led on outdoor control board bright?
NO
Is the connection on outdoor control board and
between indoor and outdoor unit good? Does the L、
N connect good? Does the S wire connect reliably?
YES
NO
YES
Is the voltage on terminal CZ1 and CZ2 of the outdoor main PCB is 5V?
No
Is the voltage between P and
N on inverter module 380V?
NO
Yes
Replace the module board.(The
power supply of PCB is supplied
by the module board.)
No
13.1.3
Replace the outdoor power
supply board.
Display LED STATUS
E2 Zero-crossing examination error
Replace the outdoor main
PCB
Is power supply right?
Yes
Is connector connection good?
Yes
13.1.4
Indoor PCB is defective
Replace the indoor control board.
Display LED STATUS
E3 Fan speed beyond control
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(rang 90v
-
160v between mid pin and N on
CN1
Is connector connection good?
Yes
No
Is voltage being applied to the fan motor?
Yes
No
Repair the connector.
13.1.5
Indoor fan motor is defective
Replace indoor fan motor.
Display LED STATUS
E5 Open or short circuit of outdoor temperature sensor
Indoor PCB is defective
Replace indoor main PCB.
Is connection to connector good?
Yes No
13.1.6
If display E5 all the same, replace indoor main PCB.
Display LED STATUS
E6 Room temperature or evaporator temperature sensor open or short circuit
Replace the sensor Repair connector
Is connection to connector good?
yesNo
13.1.7
Display LED STATUS
P0 Module protection
Replace the sensor
Repair connector
If display E6 all the same, replace outdoor main PCB.
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Is connection to connector good?
No Yes
Is the wires to compressor right?
Repair connector
Yes
No
Yes
Yes
Check the voltage between P and N on inverter
module. Is it about 380V?
Test the outdoor power supply board again.
Check the inverter module,If some component
cracked or damaged?
No
Inverter module damaged, replace it.
No
Is it breakdown between P-N,P-U,P-V;N-W,N-U,N-V
At inverter module
NoYes
13.1.8
Display LED STATUS
P1 Over voltage or too low voltage protection
Check compressor Inverter module is defective
Is the power supply right?
Yes
Check the outdoor power board
13.1.9
Display LED STATUS
Off: 115゜C; On: 100゜C
Replace outdoor main PCB.
P2 Compressor top protection against temperature
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Does compressor operate?
No
Is refrigerant circulation volume normal?
Gas charging
Is abnormality the same after gas charging
Yes
No
Is the connection good?
Yes
Is protector normal?
Yes
No
Connect and test again.
No
Replace protector
No
Check the outdoor main PCB
13.1.10
This is optional, factory standard unit has not this function.
Unit stops when outdoor temp. is low than -15°C and lasting time more than 60 minutes, and unit
runs again when outdoor temp. more than -12°C.
Check refrigerant system (such as clogging of
Replace the outdoor main PCB.
Display LED STATUS
P3 Outdoor low temp. protection
Is the outdoor temp. low than -15°C?
No
Is the outdoor temp sensor right according to the table in clause 12
46
Yes
Replace the outdoor main board
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13.2 Diagnostic chart
After energizing, no indicator is lighted and the air conditioner can’t be operated.
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13.3 Resetting phenomenon often occurs during operation
(That is automatically entering to the status when power is on.)
The reason is that the instantaneous voltage of main chip is less than 4.5V. Check according to the
following procedure:
Resetting phenomenon often occurs during operation.
Yes
After changing indoor PCB, check if the failure realease.
Yes
After changing indoor fan motor, check if the failure realease.
YES
Power supply circuit has problems.
Indoor PCB is defective.
13.4 Operation lamp flashes and Timer lamp off
Yes
13.5 Operation lamp flashes and Timer lamp on
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13.6 Operation lamp off and Timer lamp flashes
13.7 Operation lamp on and Timer lamp flashes
EEROM error, indoor PCB is defective.
13.8 Operation lamp flashes, Timer lamp flashes
This is alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the
main control board must have fault.
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