How it Works
Midea
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MSG-12HRN2
Schematic
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Midea MSG-07CRN2, MSG-07HRN2, MSG-09CRN2, MSG-09HRN2, MSG-12CRN2 Schematic

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MSG-07CRN2; MSG-07HRN2 MSG-09CRN2; MSG-09HRN2 MSG-12CRN2; MSG-12HRN2 MSG-16CRN2; MSG-16HRN2 MSG-18CRN2; MSG-18HRN2 MSG-21CRN2; MSG-21HRN2
Content
Content
1. Precaution....................................................................................................................1
2. Function .......................................................................................................................3
3. Dimension .................................................................................................................... 5
4. Specification ................................................................................................................7
5. Refrigerant cycle diagram......................................................................................... 11
6. Operation limits .........................................................................................................12
7. Schematic diagram and Wiring diagram .................................................................13
8. Installation details......................................................................................................19
8.5 Pumping down (Re-installation) ............................................................................................... 21
8.6 Re-air purging (Re-installation) ................................................................................................22
8.7 Balance refrigerant of the 2-way, 3-way valves........................................................................ 23
9. Capacity table ............................................................................................................26
10. Electronic function....................................................................................................32
- 1 -
Content
10.2 Proper symbols and their meaning .......................................................................................... 32
11. Model and Parameters ..............................................................................................40
12. Troubleshooting.........................................................................................................41
12.4 Resetting phenomenon often occurs during operation............................................................. 44
13. Characteristic of temperature sensor......................................................................46
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Service manual
1. Precaution
1.1 Safety Precaution
To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first.
1.2 Warning
¾ Installation
Do not use a defective or underrated circuit breaker.
Use this appliance on a dedicated circuit.
There is risk of fire or electric shock.
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.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control box
securely.
There is risk of fire of electric shock.
Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric shock.
Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
Do not modify or extend the power cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall the unit by
yourself (customer).
There is risk of fire, electric shock, explosion, or injury.
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.
For installation, always contact the dealer or an
Authorized service center.
There is risk of fire, electric shock, explosion, or injury.
Do not install the product on a defective installation
stand.
It may cause injury, accident, or damage to the product.
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.
Do not let the air conditioner run for a long time
when the humidity is very high and a door or a
- 1 -
windows is left open.
Moisture may condense and wet or damage furniture.
Take care to ensure that power cable could not be
pulled out or damaged during operation.
There is risk of fire or electric shock.
Do not place anything on the power cable.
There is risk of fire or electric shock.
Do not plug or unplug the power supply plug during
operation.
There is risk of fire or electric shock.
Do not touch (operation) the product with wet hands.
There is risk of fire or electric shock.
Do not place a heater or other appliance near the
power cable.
There is risk of fire and electric shock.
Do not allow water to run into electric parts.
It may cause fire, failure of the product, or electric shock.
Do not store or use flammable gas or combustible
near the product.
There is risk of fire or failure of product.
Do not use the product in a tightly closed space for a
long time.
Oxygen deficiency could occur.
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.
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.
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.
Do not open the inlet grill of the product during
operation. (Do not touch the electrostatic filter, if the
Service manual
unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
When the product is soaked (flooded or submerged),
contact an Authorized service center.
There is risk of fire or electric shock.
Be caution that water could not enter the product.
There is risk of fire, electric shock, or product damage.
Ventilate the product from time to time when
operating it together with a stove, etc.
There is risk of fire or electric shock.
Turn the main power off when cleaning or
maintaining the product.
There is risk of electric shock.
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.
Take care to ensure that no body could step on or fall
onto the outdoor unit.
This could result in personal injury and product damage.
¾ CAUTION
Always check for gas (refrigerant) leakage after
installation or repair of product.
Low refrigerant levels may cause failure of product.
Install the drain hose to ensure that water is drained
away properly.
A bad connection may cause water leakage.
Keep level even when installing the product.
To avoid vibration of water leakage.
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.
Use two or more people to lift and transport the
product.
Avoid personal injury.
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.
¾ Operational
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.
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.
Do not block the inlet or outlet of air flow.
It may cause product failure.
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.
Do not touch the metal parts of the product when
removing the air filter. They are very sharp.
There is risk of personal injury.
Do not step on pr put anything on the product.
(outdoor units)
There is risk of personal injury and failure of product.
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.
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.
Do not drink the water drained from the product.
It is not sanitary could cause serious health issues.
Use a firm stool or ladder when cleaning or
maintaining the product.
Be careful and avoid personal injury.
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.
Do not recharge or disassemble the batteries. Do not
dispose of batteries in a fire.
They may burn of explode.
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.
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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.
Starting temperature control
Indoor fan is delayed for 5 sec at the starting.
Service manual
Time Delay Safety control
Restarting is for approx. 3 minutes..
Indoor fan speed control
High, med, low, breeze.
Operation indication Lamps (LED)
Light up in the LED (LCD) for each operation mode.
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 after seven hours.
Independent dehumidification
The function is usually used in rainy days in springtime or damp areas.
Self-diag. function
Anti-cold function
Prevent the cold wind at the beginning of unit start.
Temp. Compensation
Defrost mode
Auto-restart function
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The function will be operate in any operation
Air flow Direction control
The louver can be set at the desired position or swing up and down automatically
Auto mode
The unit can be change by the room temperature.
Flexible wiring connection
Easy clean panel
Service manual
Outdoor unit
Power relay control
The unit has 3 mins delay between continuously ON/OFF operations.
Low ambient kit
The unit can operate in cooling mode at low ambient temperature conditions.
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.
Discharge pipe temperature protect
Anti-rust cabinet
Made from electrolytic zinc steel sheet and anti-rust coated components.
Valve protection
It protects the valves and prevents water from dripping.
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3. Dimension
3.1 Indoor unit
Service manual
Dimension Mode
7K 750 250 188
9K 750 250 188 12K 750 250 188 16K 906 286 235 18K 906 286 235 21K 906 286 235
WH L
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3.2 Outdoor unit
Service manual
Dimension Mode
7K 700 535 235 458 280 540
9K 700 535 235 458 280 540 12K 780 540 250 530 315 590 16K 760 590 285 540 335 615 18K 760 590 285 540 335 615 21K 845 695 335 560 360 735
W H D L1L2L3
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/
4. Specification
Service manual
Model
Power supply
Capacity Btu/h
Cooling
Heating
Max. current Starting current
Compressor
Indoor fan motor
Indoor air flow (Hi/Mi/Lo) Indoor noise level (Hi/Mi/Lo)
Outdoor fan motor
Outdoor air flow Outdoor noise level Refrigerant type R407C Design pressure
Refrigerant piping
Operation temp Ambient temp Application area
Input W Rated current A EER Btu/w.h Capacity Btu/h Input W Rated current A COP W/W
Model Type Brand Capacity Btu/h 8086/8172 8086/8172 10800 Input W 765/785 765/785 1015 Rated current(RLA) A 3.52/3.34 3.52/3.34 4.5 Locked rotor Amp(LRA) A 21 21.0 19.8 Thermal protector UP3SE0591-T71 UP3SE0591-T71 UP3SE0591-T61 Capacitor uF Refrigerant oil ml Model Brand Welling Welling Welling Input W Capacitor uF Speed(hi/mi/lo) r/min 1020/960/900 1020/960/900 1100/1020/950
Model Brand Welling Welling WELLING Input W Capacitor uF Speed r/min
Liquid side/ Gas side mm Ф6.35/Ф9.53 Ф6.35/Ф9.53 Max. refrigerant pipe length m 10 10 10 Max. difference in level m 5 5 5
MSG-07CRN2 MSG-07HRN2 MSG-09CRN2
Ph-V-Hz
m3/h
dB(A)
m
dB(A)494952
MPa
m
1, 220-240V~,50Hz 1, 220-240V~,50Hz 1, 220-240V~,50Hz
7000 7000
780 780
3.5 3.5
9.0,2.6 9.0,2.6 9.0,2.6
----- 8000 -----
----- 800 -----
----- 3.6 -----
-----
A4.4 4.4 6
18 18 19.8
PG135X1C-4DZ2 PG135X1C-4DZ2 PG180X1C-4DZ3
Rotary Rotary Rotary
TOSHIBA TOSHIBA TOSHIBA
25 25 30
400 400 400
RPG13H RPG13H RPG13H
37.5 36.5 39.5
1.2 1.2 1.2
430/400/370 430/400/370 470/440/410
35/32/30 35/32/30 36/32/30
YDK24-6T YDK24-6T YDK24-6T
70 70 70
333
850 850 850
1500 1500 1600
650 740 620
2.8 2.8 2.8
17-30 17-30 17-30 18-45 -7 - 45 18-45 10-14 10-14 10-14
℃ ℃
A
3
h
g
2
2.9
9000 1000
4.4
-----
Ф6.35/Ф9.53
Note:
The noise date is base on hemi-anechoic chamber, during actual operation; these values are normally somewhat different as a result of ambient condition. The above design and specifications are subject to change without prior notice for product improvement.
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Service manual
/
Model
Power supply
Capacity Btu/h 9000
Cooling
Input W 1000 Rated current A 4.4 EER Btu/w.h Capacity Btu/h 11000 -----
Heating
Input W 1100 ----­Rated current A 4.9 -----
COP W/W 2.9 ----- 2.9 Max. current Starting current
Model
Type
Brand
Capacity Btu/h 10800 13550/13700 13550/13700
Compressor
Input W 1015 1290/1335 1290/1335
Rated current(RLA) A 4.5 6.1 6.1
Locked rotor Amp(LRA) A 19.8 33 33
Thermal protector UP3SE0591-T61 UP3RE0591-T56 UP3RE0591-T56
Capacitor uF
Refrigerant oil ml
Model
Indoor fan motor
Brand Welling WELLING WELLING
Input W
Capacitor uF
Speed(hi/mi/lo) r/min 1100/1020/950 1250/1150/1050 1250/1150/1050 Indoor air flow (Hi/Mi/Lo) Indoor noise level (Hi/Mi/Lo)
Model
Outdoor fan motor
Brand Welling WELLING WELLING
Input W
Capacitor uF
Speed r/min Outdoor air flow Outdoor noise level Refrigerant type R407C Design pressure
Refrigerant piping
Liquid side/ Gas side mm
Max. refrigerant pipe length m 10 10 10
Max. difference in level m 5 5 5 Operation temp Ambient temp
Application area
MSG-09HRN2 MSG-12CRN2 MSG-12HRN2
Ph-V-Hz
1, 220-240V~,50Hz 1, 220-240V~,50Hz 1, 220-240V~,50Hz
12000 12000
1330 1330
66
9.0,2.6 9.0 ,2.6 9.0 ,2.6 14000
1400
6.3
A6 7 8 A
19.8
PG180X1C-4DZ3
Rotary
33 33
PG225X2C-4FT PG225X2C-4FT
rotary rotary
TOSHIBA TOSHIBA TOSHIBA
30
400
35 35
480 480
RPG13H RPG18H RPG18H
38.5 50 50
1.2 1.5 1.5
m3/h
dB(A)
3
m
h
470/440/410
500/450/400 500/450/400
36/32/30 40/36/34 40/36/34
YDK24-6T
70
3
850
YDK25-6C YDK25-6C
68 68
2.5 2.5
900 900
1600 1900 1900
dB(A)525555
g 800 780 1100
MPa
2.8 2.8
2.8
Ф6.35/Ф9.53 Ф6.35/Ф12.7 Ф6.35/Ф12.7
℃ ℃
2
m
17-30
-7 - 45 18-45 18-45 14-21 18-26 18-26
17-30 17-30
Note:
The noise date is base on hemi-anechoic chamber, during actual operation; these values are normally somewhat different as a result of ambient condition. The above design and specifications are subject to change without prior notice for product improvement.
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Service manual
/
Model
Power supply
Capacity Btu/h 16000 16000 17000
Cooling
Input W 1810 1820 1890 Rated current A 8.3 8.3 8.5 EER Btu/w.h 8.8, 2.6 8.8, 2.6 9.0, 2.63 Capacity Btu/h 18000
Heating
Input W 1660 Rated current A 7.6
COP W/W 3.2 Max. current Starting current
Model PG295*2CS-4KU1 PG295*2CS-4KU1 PG295*2CS-4KU1
Type Rotary Rotary Rotary
Brand GD Toshiba GD Toshiba GD Toshiba
Capacity Btu/h 18083 18083 18083
Compressor
Input W 1760 1760 1760
Rated current(RLA) A 8.5 8.5 8.5
Locked rotor Amp(LRA) A 40 40 40
Thermal protector Internal Internal Internal
Capacitor uF 35UF/370V 35UF/370V 35UF/370V
Refrigerant oil ml 750 750 750
Model
Indoor fan motor
Brand WELLING WELLING WELLING
Input W 53 53 53
Capacitor uF 1.5uF/450V 1.5uF/450V 1.5uF/450V
Speed(hi/mi/lo) r/min 1260/1100/1000 1260/1100/1000 1260/1100/1000 Indoor air flow (Hi/Mi/Lo) Indoor noise level (Hi/Mi/Lo)
Model
Outdoor fan motor
Brand WELLING WELLING WELLING
Input W
Capacitor uF
Speed r/min Outdoor air flow Outdoor noise level Refrigerant type R407C Design pressure
Refrigerant piping
Liquid side/ Gas side mm
Max. refrigerant pipe length m 10 10 10
Max. difference in level m 5 5 5 Operation temp Ambient temp
Application area
MSG-16CRN2 MSG-16HRN2 MSG18CRN2
Ph-V-Hz
1, 220-240V~,50Hz 220-240V~,50Hz 220-240V~,50Hz
A131313 A414141
RPG25 RPG25 RPG25
m3/h
800/770/740 800/770/740 800/770/740
dB(A) 42/40/38 42/40/38 42/40/38
YDK36-6 YDK36-6 YDK36-6
96 96 96
2.5μF/450V 2.5μF/450V
2.5μF/450V
900 900 900
3
m
h
dB(A) 53
g 1380
MPa 2.8
1900 1900 1900
53 53
1380 2200
2.8 2.8
Ф6.35/Ф12.7 Ф6.35/Ф12.7 Ф6.35/Ф12.7
℃ ℃
2
m
17-30 17-30 17-30 18-45 -7 - 45 18-45 25-35 25-35 30-40
Note:
The noise date is base on hemi-anechoic chamber, during actual operation; these values are normally somewhat different as a result of ambient condition. The above design and specifications are subject to change without prior notice for product improvement.
- 9 -
Service manual
/
Model
Power supply
Capacity Btu/h 17000
Cooling
Input W 1890 Rated current A 8.5 EER Btu/w.h 9.0, 2.63 Capacity Btu/h 19000
Heating
Input W 1900 Rated current A 8.6
COP W/W 2.93 Max. current Starting current
Model PG295*2CS-4KU1
Type Rotary
Brand GD Toshiba
Capacity Btu/h 18083 20800 20800
Compressor
Input W 1760 1970 1970
Rated current(RLA) A 8.5 9.2 9.2
Locked rotor Amp(LRA) A 40
Thermal protector Internal UP3SE0391-T09 UP3SE0391-T09
Capacitor uF 35UF/370V
Refrigerant oil ml 750
Model
Indoor fan motor
Brand WELLING WELLING WELLING
Input W 53
Capacitor uF 1.5uF/450V
Speed(hi/mi/lo) r/min 1260/1100/1000 1260/1100/1000 1260/1100/1000 Indoor air flow (Hi/Mi/Lo) Indoor noise level (Hi/Mi/Lo)
Model
Outdoor fan motor
Brand WELLING WELLING WELLING
Input W
Capacitor uF
Speed r/min Outdoor air flow Outdoor noise level Refrigerant type R407C Design pressure
Refrigerant piping
Liquid side/ Gas side mm
Max. refrigerant pipe length m 15 20 20
Max. difference in level m 8 10 10 Operation temp Ambient temp
Application area
MSG-18HRN2 MSG-21CRN2 MSG-21HRN2
Ph-V-Hz
1, 220-240V~,50Hz 1, 220-240V~,50Hz 1, 220-240V~,50Hz
18000 18000
2080 2080
9.5 9.5
8.7, 2.54 8.7, 2.54
----- 22000
-----
-----
-----
2450
11.2
2.63 A131313 A41
44 44
PG340X3CS-4KU2 PG340X3CS-4KU2
Rotary Rotary
TOSHIBA TOSHIBA
50 50
850 850
RPG25 RPG25 RPG25
53 53
1.5 1.5
m3/h
dB(A) 42/40/38
800/770/740 800/770/740 800/770/740
41/37/35 41/37/35
YDK36-6 YDK53-6KB YDK53-6KB
96 150 150
2.5μF/450V 3.0μF/450V 3.0μF/450V 900 840 840
3
m
h
1900 2300 2300
dB(A)535353
g
MPa
2100 2200
2.8 2.8
2100
2.8
Ф6.35/Ф12.7 Ф6.35/Ф12.7 Ф6.35/Ф12.7
℃ ℃
2
m
17-30 17-30 17-30
-7 - 45 18-45 -7 - 45 30-40 34-49 34-49
Note:
The noise date is base on hemi-anechoic chamber, during actual operation; these values are normally somewhat different as a result of ambient condition. The above design and specifications are subject to change without prior notice for product improvement.
- 10 -
Service manual
5. Refrigerant cycle diagram
¾ Cooling only
¾ Heat pump mode
- 11 -
6. Operation limits
6.1 Cooling operation
Outdoor unit air temp.℃ DB
Service manual
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.
- 12 -
Service manual
7. Schematic diagram and Wiring diagram
7.1 Schematic diagram
- 13 -
7.2 Wiring diagram
7.2.1 Cooling mode
MSG-07CR, MSG-09CR, MSG-12CR
Service manual
- 14 -
INDOOR UNIT
OUTDOOR UNI
OVERLOAD
RELAY
COMPRESSO
Y＆G
T
BLACK
BLACK
R
C
RED
R
S
BLU
E
1 2(N)
RED
COMPRESSOR CAPACITOR
Y＆G
FAN
MOTOR
BLACK
BLU
Y＆G
RED
RED
E
FAN CAPACITOR
MSG-16CR
Service manual
INDOOR UNIT
OUTDOOR UNI
OVERLOAD
RELAY
COMPRESSO
Y＆G
T
BLACK
BLACK
R
C
RED
R
S
BLU
E
1 2(N)
RED
COMPRESSOR CAPACITOR
Y＆G
FAN
MOTOR
BLACK
BLU
Y＆G
RED
RED
E
FAN CAPACITOR
- 15 -
MSG-18CR, MSG-21CR
Service manual
TRANSFORMER
SWITCH BOARD
CN9
CN12
DISPLAY BOARD
CN10
AMBIENT SENSOR
CN8
CN7
SENSOR
HEAT EXCHANGER
CN4
CN6
LOUVER MOTOR
COMPRESSOR RELAY
WHITE
CURRENT DETECTOR
CN5
LOUVER MOTOR
INDOOR MOTOR
CN1
CN14
CN2
BLUE
BROWN
BLACK
WHITE
INDOOR UNIT
OUTDOOR UNI
OVERLOAD
RELAY
COMPRESSO
Y＆G
T
1 2(N)
Y＆G
BLACK
BLACK
RED
RED
BLACK
R
C
RED
R
S
BLU
E
COMPRESSOR CAPACITOR
Y＆G
FAN
MOTOR
BLU
RED
E
FAN CAPACITOR
- 16 -
7.2.2 MSG-07HR, MSG-09HR, MSG-12HR
Service manual
- 17 -
MSG-16HR, MSG-18HR, MSG-21HR
Service manual
- 18 -
Service manual
A
8. Installation details
8.1 Wrench torque sheet for installation
Outside diameter
mm inch Kg.m
φ6.35 1/4 1.8 φ9.52 3/8 4.2
φ12.7 1/2 5.5 φ15.88 5/8 6.6
φ19.05 3/4 6.6
Torque
8.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 7K 9K 12K 18K 24K 28K
mm2 1.0 1.0 1.5 2.5 2.5 2.5
8.3 Pipe length and the elevation
Standard
Capacity
Btu/h GAS LIQUID B (m)
7k~12K
16K~28K
30K~36K
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 5/8’’ (φ15.88) 3/8’’ (φ9.52) 5 10 20 65 5/8’’ (φ15.88) 3/8’’ (φ9.52) 5 15 30 65 3/4’’ (φ19.05) 3/8’’ (φ9.52) 5 15 30 65
Pipe size
length
(m) Elevation Elevation refrigerant
Max. Max. Additional
(m) (g/m)
In case that
more than
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be install per 5-7 meters.
- 19 -
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.
- 20 -
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.
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.
- 21 -
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.
- 22 -
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.
- 23 -
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.
- 24 -
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.
- 25 -
Service manual
g
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g
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9. Capacity table
9.1 MSG-07CRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 1.97 1.85 1.71 1.58 1.47 1.37
15ºC W Sensitive capacity kW 1.44 1.38 1.29 1.20 1.13 1.05
24ºC D Total capacity kW 2.13 2.04 1.90 1.80 1.68 1.55
17ºC W Sensitive capacity kW 1.57 1.52 1.45 1.38 1.29 1.20
27ºC D Total capacity kW 2.27 2.17
19ºC W Sensitive capacity kW 1.73 1.67
32ºC D Total capacity kW 2.53 2.43 2.35 2.18 2.00 1.88
23ºC W Sensitive capacity kW 1.95 1.89 1.84 1.72 1.60 1.52
Coolin
mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 0.67 0.70 0.73 0.79 0.88 0.91
Input kW. 0.69 0.73 0.76 0.82 0.91 0.94
Input kW. 0.71 0.75
Input kW. 0.74 0.78 0.81 0.88 0.97 1.01
9.2 MSG-07HRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 1.97 1.85 1.71 1.58 1.47 1.37
15ºC W Sensitive capacity kW 1.44 1.38 1.29 1.20 1.13 1.05
24ºC D Total capacity kW 2.13 2.04 1.90 1.80 1.68 1.55
17ºC W Sensitive capacity kW 1.57 1.52 1.45 1.38 1.29 1.20
27ºC D Total capacity kW 2.27 2.17
19ºC W Sensitive capacity kW 1.73 1.67
32ºC D Total capacity kW 2.53 2.43 2.35 2.18 2.00 1.88
23ºC W Sensitive capacity kW 1.95 1.89 1.84 1.72 1.60 1.52
WINTER
Indoor
Conditions
15ºC
18ºC
20ºC
22ºC
Coolin
mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 0.67 0.70 0.73 0.79 0.88 0.91
Input kW. 0.69 0.73 0.76 0.82 0.91 0.94
Input kW. 0.71 0.75
Input kW. 0.74 0.78 0.81 0.88 0.97 1.01
OUTDOOR CONDITIONS 12ºC D
11ºC W
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
2.76 2.42 2.22 1.95 1.68 1.47
0.86 0.78 0.73 0.67 0.59 0.53
2.71 2.38 2.16 1.88 1.59 1.38
0.88 0.79 0.74 0.69 0.60 0.54
2.69
0.91
2.66 2.31 2.11 1.81 1.48 1.23
0.94 0.81 0.77 0.73 0.66 0.59
OUTDOOR TEMPERATURE DRY
2.05
1.60
0.78
OUTDOOR TEMPERATURE DRY
2.05
1.60
0.78
7ºC D
6ºC W
2.34
0.80
4ºC D
3ºC W
2.14 1.83 1.51 1.25
0.76 0.70 0.62 0.57
1.94 1.81 1.66
1.52 1.42 1.32
0.84 0.94 0.97
1.94 1.81 1.66
1.52 1.42 1.32
0.84 0.94 0.97
0ºC D
-1ºC W
-4ºC D
-6ºC W
-7ºC D
-8ºC W
- 26 -
Service manual
e
e
9.3 MSG-09CRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 2.50 2.35 2.17 2.00 1.87 1.73
15ºC W Sensitive capacity kW 1.82 1.75 1.64 1.52 1.43 1.34
24ºC D Total capacity kW 2.71 2.58 2.42 2.28 2.13 1.96
17ºC W Sensitive capacity kW 1.99 1.93 1.84 1.75 1.64 1.52
27ºC D Total capacity kW 2.88 2.75
19ºC W Sensitive capacity kW 2.19 2.12
32ºC D Total capacity kW 3.21 3.08 2.98 2.77 2.53 2.38
23ºC W Sensitive capacity kW 2.47 2.40 2.34 2.19 2.02 1.93
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 0.86 0.90 0.94 1.02 1.13 1.17
Input kW. 0.88 0.93 0.97 1.05 1.16 1.20
Input kW. 0.91 0.96
Input kW. 0.95 1.00 1.04 1.12 1.25 1.29
OUTDOOR TEMPERATURE DRY
2.60
2.03
1.00
2.46 2.29 2.11
1.93 1.80 1.67
1.08 1.20 1.24
9.4 MSG-09HRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 2.50 2.35 2.17 2.00 1.87 1.73
15ºC W Sensitive capacity kW 1.82 1.75 1.64 1.52 1.43 1.34
24ºC D Total capacity kW 2.71 2.58 2.42 2.28 2.13 1.96
17ºC W Sensitive capacity kW 1.99 1.93 1.84 1.75 1.64 1.52
27ºC D Total capacity kW 2.88 2.75
19ºC W Sensitive capacity kW 2.19 2.12
32ºC D Total capacity kW 3.21 3.08 2.98 2.77 2.53 2.38
23ºC W Sensitive capacity kW 2.47 2.40 2.34 2.19 2.02 1.93
WINTER
Indoor
Conditions
15ºC
18ºC
20ºC
22ºC
Cooling mod
Input kW. 0.86 0.90 0.94 1.02 1.13 1.17
Input kW. 0.88 0.93 0.97 1.05 1.16 1.20
Input kW. 0.91 0.96
Input kW. 0.95 1.00 1.04 1.12 1.25 1.29
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
OUTDOOR CONDITIONS 12ºC D
11ºC W
3.80 3.33 3.05 2.68 2.31 2.03
1.18 1.07 1.00 0.92 0.81 0.73
3.73 3.27 2.98 2.58 2.19 1.90
1.21 1.09 1.01 0.95 0.83 0.74
3.70
1.25
3.66 3.18 2.90 2.48 2.04 1.69
1.29 1.11 1.06 1.01 0.91 0.81
OUTDOOR TEMPERATURE DRY
2.46 2.29 2.11
1.93 1.80 1.67
1.08 1.20 1.24
0ºC D
-1ºC W
7ºC D
6ºC W
3.22
1.10
2.60
2.03
1.00
4ºC D
3ºC W
2.94 2.52 2.07 1.72
1.05 0.97 0.85 0.78
-4ºC D
-6ºC W
-7ºC D
-8ºC W
- 27 -
Service manual
e
e
9.5 MSG-12CRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 3.36 3.16 2.93 2.69 2.52 2.33
15ºC W Sensitive capacity kW 2.46 2.36 2.21 2.05 1.92 1.80
24ºC D Total capacity kW 3.64 3.48 3.25 3.07 2.86 2.64
17ºC W Sensitive capacity kW 2.68 2.59 2.47 2.35 2.21 2.05
27ºC D Total capacity kW 3.88 3.71
19ºC W Sensitive capacity kW 2.95 2.85
32ºC D Total capacity kW 4.32 4.14 4.01 3.73 3.41 3.21
23ºC W Sensitive capacity kW 3.33 3.23 3.15 2.94 2.73 2.60
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 1.14 1.20 1.25 1.35 1.50 1.55
Input kW. 1.17 1.24 1.29 1.39 1.55 1.60
Input kW. 1.21 1.28
Input kW. 1.26 1.33 1.38 1.49 1.66 1.72
OUTDOOR TEMPERATURE DRY
3.50
2.73
1.33
3.31 3.08 2.84
2.60 2.43 2.25
1.44 1.60 1.65
9.6 MSG-12HRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 3.36 3.16 2.93 2.69 2.52 2.33
15ºC W Sensitive capacity kW 2.46 2.36 2.21 2.05 1.92 1.80
24ºC D Total capacity kW 3.64 3.48 3.25 3.07 2.86 2.64
17ºC W Sensitive capacity kW 2.68 2.59 2.47 2.35 2.21 2.05
27ºC D Total capacity kW 3.88 3.71
19ºC W Sensitive capacity kW 2.95 2.85
32ºC D Total capacity kW 4.32 4.14 4.01 3.73 3.41 3.21
23ºC W Sensitive capacity kW 3.33 3.23 3.15 2.94 2.73 2.60
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 1.14 1.20 1.25 1.35 1.50 1.55
Input kW. 1.17 1.24 1.29 1.39 1.55 1.60
Input kW. 1.21 1.28
Input kW. 1.26 1.33 1.38 1.49 1.66 1.72
WINTER
Indoor
Conditions
15ºC
18ºC
20ºC
22ºC
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
OUTDOOR CONDITIONS 12ºC D
11ºC W
4.87 4.27 3.92 3.44 2.96 2.60
1.50 1.37 1.27 1.18 1.02 0.93
4.78 4.20 3.82 3.31 2.81 2.43
1.54 1.39 1.29 1.21 1.05 0.94
4.74
1.58
4.70 4.08 3.72 3.19 2.61 2.16
1.64 1.41 1.35 1.28 1.15 1.03
OUTDOOR TEMPERATURE DRY
3.31 3.08 2.84
2.60 2.43 2.25
1.44 1.60 1.65
0ºC D
-1ºC W
7ºC D
6ºC W
4.13
1.40
3.50
2.73
1.33
4ºC D
3ºC W
3.77 3.23 2.66 2.21
1.33 1.23 1.09 0.99
-4ºC D
-6ºC W
-7ºC D
-8ºC W
- 28 -
Service manual
e
e
9.7 MSG-16CRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 4.50 4.23 3.91 3.60 3.36 3.12
15ºC W Sensitive capacity kW 3.28 3.15 2.95 2.74 2.57 2.40
24ºC D Total capacity kW 4.87 4.65 4.35 4.11 3.83 3.53
17ºC W Sensitive capacity kW 3.58 3.47 3.30 3.14 2.95 2.74
27ºC D Total capacity kW 5.19 4.96
19ºC W Sensitive capacity kW 3.94 3.82
32ºC D Total capacity kW 5.78 5.54 5.36 4.98 4.55 4.29
23ºC W Sensitive capacity kW 4.45 4.32 4.21 3.94 3.64 3.48
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 1.56 1.64 1.71 1.85 2.05 2.12
Input kW. 1.61 1.69 1.77 1.91 2.12 2.19
Input kW. 1.66 1.75
Input kW. 1.72 1.82 1.89 2.04 2.27 2.35
OUTDOOR TEMPERATURE DRY
4.68
3.65
1.82
4.42 4.12 3.80
3.47 3.25 3.00
1.97 2.18 2.26
9.8 MSG-16HRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 4.50 4.23 3.91 3.60 3.36 3.12
15ºC W Sensitive capacity kW 3.28 3.15 2.95 2.74 2.57 2.40
24ºC D Total capacity kW 4.87 4.65 4.35 4.11 3.83 3.53
17ºC W Sensitive capacity kW 3.58 3.47 3.30 3.14 2.95 2.74
27ºC D Total capacity kW 5.19 4.96
19ºC W Sensitive capacity kW 3.94 3.82
32ºC D Total capacity kW 5.78 5.54 5.36 4.98 4.55 4.29
23ºC W Sensitive capacity kW 4.45 4.32 4.21 3.94 3.64 3.48
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 1.56 1.64 1.71 1.85 2.05 2.12
Input kW. 1.61 1.69 1.77 1.91 2.12 2.19
Input kW. 1.66 1.75
Input kW. 1.72 1.82 1.89 2.04 2.27 2.35
WINTER
Indoor
Conditions
15ºC
18ºC
20ºC
22ºC
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
OUTDOOR CONDITIONS 12ºC D
11ºC W
6.22 5.45 5.00 4.39 3.77 3.32
1.78 1.62 1.51 1.39 1.22 1.10
6.10 5.35 4.87 4.23 3.59 3.11
1.83 1.65 1.53 1.43 1.25 1.12
6.05
1.88
5.99 5.21 4.74 4.07 3.34 2.76
1.94 1.68 1.60 1.52 1.37 1.22
OUTDOOR TEMPERATURE DRY
4.42 4.12 3.80
3.47 3.25 3.00
1.97 2.18 2.26
0ºC D
-1ºC W
7ºC D
6ºC W
5.27
1.66
4.68
3.65
1.82
4ºC D
3ºC W
4.82 4.13 3.39 2.81
1.58 1.46 1.29 1.18
-4ºC D
-6ºC W
-7ºC D
-8ºC W
- 29 -
Service manual
e
e
9.9 MSG-18CRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 4.79 4.50 4.16 3.83 3.58 3.32
15ºC W Sensitive capacity kW 3.50 3.35 3.14 2.91 2.74 2.56
24ºC D Total capacity kW 5.18 4.95 4.63 4.37 4.08 3.76
17ºC W Sensitive capacity kW 3.81 3.69 3.52 3.34 3.14 2.91
27ºC D Total capacity kW 5.52 5.27
19ºC W Sensitive capacity kW 4.19 4.06
32ºC D Total capacity kW 6.15 5.90 5.70 5.30 4.85 4.57
23ºC W Sensitive capacity kW 4.73 4.60 4.48 4.19 3.88 3.70
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 1.62 1.71 1.78 1.92 2.13 2.20
Input kW. 1.67 1.76 1.83 1.98 2.20 2.27
Input kW. 1.72 1.81
Input kW. 1.79 1.89 1.97 2.12 2.36 2.44
OUTDOOR TEMPERATURE DRY
4.98
3.88
1.89
4.71 4.39 4.04
3.69 3.46 3.19
2.04 2.27 2.34
9.10 MSG-18HRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 4.79 4.50 4.16 3.83 3.58 3.32
15ºC W Sensitive capacity kW 3.50 3.35 3.14 2.91 2.74 2.56
24ºC D Total capacity kW 5.18 4.95 4.63 4.37 4.08 3.76
17ºC W Sensitive capacity kW 3.81 3.69 3.52 3.34 3.14 2.91
27ºC D Total capacity kW 5.52 5.27
19ºC W Sensitive capacity kW 4.19 4.06
32ºC D Total capacity kW 6.15 5.90 5.70 5.30 4.85 4.57
23ºC W Sensitive capacity kW 4.73 4.60 4.48 4.19 3.88 3.70
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 1.62 1.71 1.78 1.92 2.13 2.20
Input kW. 1.67 1.76 1.83 1.98 2.20 2.27
Input kW. 1.72 1.81
Input kW. 1.79 1.89 1.97 2.12 2.36 2.44
WINTER
Indoor
Conditions
15ºC
18ºC
20ºC
22ºC
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
OUTDOOR CONDITIONS 12ºC D
11ºC W
6.57 5.76 5.28 4.64 3.99 3.51
2.04 1.85 1.72 1.59 1.39 1.26
6.45 5.66 5.15 4.47 3.79 3.28
2.09 1.88 1.75 1.64 1.43 1.28
6.39
2.15
6.34 5.51 5.01 4.30 3.53 2.92
2.23 1.92 1.83 1.74 1.57 1.40
OUTDOOR TEMPERATURE DRY
4.71 4.39 4.04
3.69 3.46 3.19
2.04 2.27 2.34
0ºC D
-1ºC W
7ºC D
6ºC W
5.57
1.90
4.98
3.88
1.89
4ºC D
3ºC W
5.09 4.36 3.59 2.97
1.81 1.67 1.47 1.35
-4ºC D
-6ºC W
-7ºC D
-8ºC W
- 30 -
Service manual
e
e
9.11 MSG-21CRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 5.07 4.76 4.41 4.05 3.79 3.52
15ºC W Sensitive capacity kW 3.70 3.55 3.33 3.08 2.89 2.71
24ºC D Total capacity kW 5.48 5.24 4.90 4.63 4.31 3.98
17ºC W Sensitive capacity kW 4.03 3.90 3.72 3.54 3.32 3.08
27ºC D Total capacity kW 5.84 5.58
19ºC W Sensitive capacity kW 4.44 4.30
32ºC D Total capacity kW 6.50 6.24 6.03 5.61 5.13 4.83
23ºC W Sensitive capacity kW 5.01 4.87 4.74 4.43 4.10 3.92
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 1.78 1.88 1.96 2.11 2.35 2.42
Input kW. 1.84 1.94 2.02 2.18 2.42 2.50
Input kW. 1.89 2.00
Input kW. 1.97 2.08 2.16 2.34 2.60 2.68
OUTDOOR TEMPERATURE DRY
5.27
4.11
2.08
4.98 4.64 4.28
3.91 3.66 3.38
2.25 2.50 2.58
9.12 MSG-21HRN2
SUMMER
Indoor
Conditions
21ºC D Total capacity kW 5.07 4.76 4.41 4.05 3.79 3.52
15ºC W Sensitive capacity kW 3.70 3.55 3.33 3.08 2.89 2.71
24ºC D Total capacity kW 5.48 5.24 4.90 4.63 4.31 3.98
17ºC W Sensitive capacity kW 4.03 3.90 3.72 3.54 3.32 3.08
27ºC D Total capacity kW 5.84 5.58
19ºC W Sensitive capacity kW 4.44 4.30
32ºC D Total capacity kW 6.50 6.24 6.03 5.61 5.13 4.83
23ºC W Sensitive capacity kW 5.01 4.87 4.74 4.43 4.10 3.92
Cooling mod
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Input kW. 1.78 1.88 1.96 2.11 2.35 2.42
Input kW. 1.84 1.94 2.02 2.18 2.42 2.50
Input kW. 1.89 2.00
Input kW. 1.97 2.08 2.16 2.34 2.60 2.68
WINTER
Indoor
Conditions
15ºC
18ºC
20ºC
22ºC
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
Capacity kW
Input kW.
OUTDOOR CONDITIONS 12ºC D
11ºC W
7.60 6.67 6.11 5.36 4.61 4.05
2.63 2.39 2.22 2.06 1.79 1.63
7.46 6.54 5.95 5.17 4.38 3.79
2.70 2.43 2.26 2.11 1.85 1.65
7.39
2.77
7.32 6.37 5.80 4.97 4.08 3.38
2.87 2.47 2.36 2.24 2.02 1.81
OUTDOOR TEMPERATURE DRY
4.98 4.64 4.28
3.91 3.66 3.38
2.25 2.50 2.58
0ºC D
-1ºC W
7ºC D
6ºC W
6.44
2.45
5.27
4.11
2.08
4ºC D
3ºC W
5.89 5.04 4.15 3.44
2.33 2.16 1.90 1.74
-4ºC D
-6ºC W
-7ºC D
-8ºC W
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Service manual
10. Electronic function
(Just for the 5K, 7K, 9K, 12K, 16K, 18K cooling and heating mode)
10.1 Electronic control working environment
Input voltage: 175~253V
Input power frequency:50HZ
Ambient temperature: -7°C+43°C Indoor fan normal working amp is less than 1A
Outdoor fan normal working amp is less than 1.5A
Four-way valve normal working amp is less than 1A
Swing motor: DC12V
Compressor: single-phase power supply. Its normal working amp is less than 15A
10.2 Proper symbols and their meaning
TA: Indoor ambient temperature
TE: Indoor evaporator temperature
TS: Setting temperature through the remote controller
I
: Self-protection amp of compressor, continue three seconds until turns off the compressor.
3sec
I
: Self-protection amp of compressor, continue five minutes until turns off the compressor.
5MIN
I
: Self-protection amp of outdoor fan/indoor fans when they change from higher wind to lower wind.
FAN
I
RESTORE
TH
TM
TL
TE1: Anti-cold wind, from Fan Off to Breeze temperature
TE2: Anti-cold wind, from Breeze to Setting Fan Speed temperature
TE3: Anti-cold wind, from Setting Fan Speed to Breeze temperature
TE4: Anti-cold wind, from Breeze to Fan Off temperature
TE5: Evaporator low temperature protection entering temperature
TE6: Evaporator low temperature protection restoring temperature
TE7: Evaporator high temperature protection, compressor off temperature
TE8: Evaporator high temperature protection, fan off temperature
TE9: Evaporator high temperature protection, restoring temperature
10.3 Function
Remote receiving
Testing and forced running
Position set for indoor unit wind vane
LED displaying and alarm
On or off Timer
Protection for the compressor
Current protection
High temperature protection of indoor heat exchanger at heating mode
Auto defrosting and heating recovery at heating mode
Anti cold air at heating mode
- 32 -
: Amp self-protection return value
DEFROST
DEFROST
DEFROST
: High wind, defrosting temperature difference
: Middle wind, defrosting temperature difference
: Low wind, defrosting temperature difference
Service manual
Anti frozen at cooling mode
10.4 Protection
10.4.1 3 minutes delay at restart for compressor.
10.4.2 Sensor protection at open circuit and breaking disconnection
10.4.3 Fan Speed is out of control. When Indoor Fan Speed is too high(higher than High
Fan+300RPM)or too low(lower than 400RPM), the unit stops and LED displays failure information
and can’t returns to normal operation automatically.
10.4.4 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 returns to normal operation automatically.
10.4.5 The current protection of the compressor
If compressor turns off for continuously 4 times due to current protection in 5 minutes from
Compressor On, the unit stops and LED displays failure information and can’t returns to normal
operation automatically.
10.5 Fan-only mode
Fan speed is high/mid/low/ Auto
10.6 Cooling mode
The 4-way valve is closed at cooling mode.
The action of the compressor and the outdoor fan:(T=indoor temperature)
- 33 -
Auto fan at cooling mode:
Service manual
Anti-freezing control to indoor evaporator at cooling mode ( T: evaporator temp. )
Compressor and
outdoor fan on
EVAP. temp. down
Compressor and outdoor
fan off (after 5 mins)
TE5 T
TE6
EVAP. temp. up
10.7 Dehumidifying mode
10.7.1 The 4-way valve is off in dehumidifying mode
10.7.2 Compressor and Indoor Fan actions in dehumidifying mode
C B A
- 34 -
0 TA-TS2
Service manual
Block
A
B
C
Indoor Fan
Compressor and Outdoor Fan
LOW ON 6minutes BREEZE OFF 4minutes LOW ON 5minutes BREEZE OFF 5minutes LOW ON 4minutes BREEZE OFF 6minutes
Repeat on and off cycle.
10.7.3 Low room temperature protection: 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 13℃.
10.7.4 At dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the same as
that of cooling mode.
10.7.5 At dehumidifying mode, the action of fans of indoor is the same as that of air-only mode.
10.8 Heating mode
10.8.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode. 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
10.8.2 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
10.8.3 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.
* This parameter can be changed from 0 to 3
10.8.4 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 (T=indoor exchanger temp.)
- 35 -
Service manual
10.8.5 Auto wind at heating mode (T=indoor temp.)
10.8.6 Indoor evaporator high-temperature protection at heating mode
(T=indoor exchanger temp.)
10.8.7 The louver opens to Standard Angle ANGLHEAT when power is on for the first time
10.9 Defrosting mode(available for heating mode)
Defrosting condition: Defrosting starts when either of the following ①&②:
① A and B are satisfied:
A: The compressor keeps running for 40 minutes or more.
B: The temperature difference of evaporator and room temperature meets one of the following:
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Service manual
② Calculate from the end of latest defrost, evaporator high temp. Protection only closes outdoor fan
with the compressor still running. Add up to 90 minutes.
Defrosting time
At condition ①, If item B is satisfied before item A, it would be regarded as severe frosting and the
defrosting time is 10 minutes. If item B is satisfied after item A, the defrosting time is 6minutes. At condition ②, the defrosting time is 10 minutes.
After three times continuous 6-minute defrost, the fourth defrost time should be 10 minutes.
The circulation is as following:
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 6 or 10 minutes.
B. The compressor current has reached to I
DEFROST
or above, I
DEROST
differs in different models
Defrosting Actions
Defrost 10 or 6 minutes
Compressor
5s
4-way valve
Outdoor fan
Indoor fan
10s
25s
2s
10.10 Auto mode
10.10.1 The air conditioner automatically selects one of the following operation modes: cooling,
heating or fan only according to the temperature difference between room temperature (TA) and set temperature (TS).
- 37 -
Service manual
10.10.2 The indoor fan blows automatically in corresponding selected mode
10.10.3 The motion of indoor fan’s blade should accord with the selected operation mode
10.10.4 One mode should be carried out for at least 15 minutes once selected. If the compressor
cannot start for 15 minutes, reselect the operation mode according to the room temp. and set temp.,
or reselect when the set temp. varies
10.11 Force cooling function
10.11.1 Select forced cooling function with the forced cooling button or the switch
10.11.2 The compressor is unconditionally turned on, after 30 minutes cooling operation whose fan
mode is set as low, the A/C operates at the DRY mode with a set temp. of 24℃
10.11.3 All protections of remote control cooling are available at forced cooling operation
10.11.4 Forced Auto function
Select forced auto function with the forced auto button or the switch. In forced auto status the A/C operates at remote control mode with a set temp. of 24℃
10.12 Sleep mode
10.12.1 The sleep function is available at cooling, heating or auto mode
10.12.2 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.
10.12.3 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 (Anti-cold function takes precedence over all).
- 38 -
Service manual
10.12.4 Auto: After an hour running under economic mode, the set temp will rise 1℃,if it is under cooling mode; the set temp will decrease 1℃,if it is under heating mode; the set temp will be changeless, if it is under
fan-only mode; the condition will be the same after the air conditioner running under economic mode
after 2 hours, and during the next time the set temp do not change. The total time is 7 hours, after 7
hours the unit stops.
10.13 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
10.14 Anion (optional)
Starts with indoor fan.
- 39 -
11. Model and Parameters
Service manual
Model
I3SEC [A] I5MIN [A] IFAN [A] IRESTORE [A] IDEFROST [A] TE1 ['C] TE2 ['C] TE3 ['C] TE4 ['C] TE5 ['C] TE6 ['C] TE7 ['C] TE8 ['C] TE9 ['C] ANGLCOOL ['] ANGLHEAT ['] ANGLOFF ['] TH
DEFROST
TM
TL
DEFROST
DEFROST
[']
[']
[']
Model
I3SEC [A] I5MIN [A] IFAN [A] IRESTORE [A] IDEFROST [A] TE1 ['C] TE2 ['C] TE3 ['C] TE4 ['C] TE5 ['C] TE6 ['C] TE7 ['C] TE8 ['C] TE9 ['C] ANGLCOOL ['] ANGLHEAT ['] ANGLOFF ['] TH
DEFROST
TM TL
DEFROST
DEFROST
[']
['] [']
MSG-07CR MSG-07HR MSG-09CR MSG-09HR MSG-12CR MSG-12HR
8.5 8.5 10 10 11 11
6.2 6.2 7.5 7.5 10 10
5.2 5.2 5.5 5.5 8 8
4.2 4.2 4.5 4.5A 6 6
3.2 3.5 5.5 28 28 28 32 32 32 30 30 30 26 26 20
222233 777788
60 60 60 53 53 53 50 50 50
200° 200° 200° 200° 200° 200°
0° 0° 0°
124° 124° 124° 124° 124° 124°
16°C14°C14°C
17°C15°C15°C
18°C16°C16°C
MSG-16CR MSG-16HR MSG-18CR MSG-18HR MSG-21CR MSG-21HR
16 16 16 16 17 17
13 13 13 13 16 16
11 11 11 11 14 14
9.5 9.5 9.5 9.5 12 12
6.5 6.5 7
34 34 34
36 36 36
30 30 30
20 20 20
333333
10 10 10 10 10 10
60 60 64
52 52 56
50 50 50
50° 50° 50° 50° 50° 50°
105° 105° 105°
0° 0° 0° 0° 0° 0°
17°C17
18°C18
19°C19
C20
°
C21
°
C22
°
C
°
C
°
C
°
- 40 -
Service manual
12. Troubleshooting
12.1 Display board
Operation
The indicator flashes once every second after power is on and illuminates when the air conditioner is
in operation.
Timer indicator:
The indicator illuminates then TIMER is set ON.
PRE-DEF. indicator (For cooling & heating mode only)
The air conditioner starts defrosting automatically if outdoor unit frosts in heating operating.
At this time, PRE-DEF. indicator illuminates.
Auto indicator:
This indicator flashes when the air conditioner is in AUTO operation.
ECON indicator
This indicator illuminates while the air conditioner is in economic operation.
- 41 -
p
p
g
p
p
g
p
g
r
12.2 Troubleshooting
For cooling mode:
Service manual
Failure phenomenon
Indoor fan speed has been out of control for over 1 minute Indoor room temp. or evaporator sensor is open circuit or short circuit Over current protection of the compressor occurs 4 times X EEROM error On No over-zero si
r
Extinguish
☆
Flash at 5Hz
nal
Operation
lam
☆ ☆
☆☆
For heat pump mode:
Failure phenomenon
Over current protection of the compressor occurs 4 times Indoor fan speed has been out of control for over 1 minute X No over-zero si Temp. sensor on indoor evaporator is open circuit or short circuit X X Indoor room temp. sensor is open circuit or short circuit X EEROM erro
r
Extinguish
☆
Flash at 5Hz
nal
Operation
lam
☆
☆☆☆
On
Timer
lam
☆☆
☆ ☆
X
Timer
lam
X
On
☆ ☆
Defrostin
lam
☆
☆
X X
- 42 -
Service manual
12.3 Diagnostic chart
After energizing, no indicator is lighted and the air conditioner can’t be operated.
- 43 -
Service manual
12.4 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:
12.5 Operation lamp flashes and Timer lamp off.
12.6 Operation lamp flashes and Timer lamp on.
- 44 -
Service manual
12.7 Operation lamp off and Timer lamp flashes
12.8 Operation lamp on and Timer lamp flashes
EEROM error, indoor PCB is defective.
12.9 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.
- 45 -
Service manual
13. Characteristic of temperature sensor
Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ
-10 62.2756 17 14.6181 44 4.3874
-9 58.7079 18 13.918 45 4.2126
-8 56.3694 19 13.2631 46 4.0459
-7 52.2438 20 12.6431 47 3.8867
-6 49.3161 21 12.0561 48 3.7348
-5 46.5725 22 11.5 49 3.5896
-4 44 23 10.9731 50 3.451
-3 41.5878 24 10.4736 51 3.3185
-2 39.8239 25 10 52 3.1918
-1 37.1988 26 9.5507 53 3.0707 0 35.2024 27 9.1245 54 2.959 1 33.3269 28 8.7198 55 2.8442 2 31.5635 29 8.3357 56 2.7382 3 29.9058 30 7.9708 57 2.6368 4 28.3459 31 7.6241 58 2.5397 5 26.8778 32 7.2946 59 2.4468 6 25.4954 33 6.9814 60 2.3577 7 24.1932 34 6.6835 61 2.2725 8 22.5662 35 6.4002 62 2.1907 9 21.8094 36 6.1306 63 2.1124
10 20.7184 37 5.8736 64 2.0373 11 19.6891 38 5.6296 65 1.9653 12 18.7177 39 5.3969 66 1.8963 13 17.8005 40 5.1752 67 1.83 14 16.9341 41 4.9639 68 1.7665 15 16.1156 42 4.7625 69 1.7055 16 15.3418 43 4.5705 70 1.6469
- 46 -
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