MSG-24CRN2; MSG-24HRN2
MSG-30CRN2; MSG-30HRN2
Content
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Content
1. Precaution....................................................................................................................1
1.1 Safety Precaution ...................................................................................................................... 1
1.2 Warning ..................................................................................................................................... 1
2. Function .......................................................................................................................3
3. Dimension .................................................................................................................... 5
3.1 Indoor unit.................................................................................................................................. 5
3.2 Outdoor unit ............................................................................................................................... 5
4. Specification ................................................................................................................6
5. Refrigerant cycle diagram...........................................................................................9
6. Operation limits .........................................................................................................10
6.1 Cooling operation..................................................................................................................... 10
6.2 Heating operation .................................................................................................................... 10
7. Schematic diagram and Wiring diagram ................................................................. 11
7.1 Schematic diagram ...................................................................................................................11
7.2 Wiring diagram......................................................................................................................... 12
8. Installation details......................................................................................................16
8.1 Wrench torque sheet for installation......................................................................................... 16
8.2 Connecting the cables ............................................................................................................. 16
8.3 Pipe length and the elevation...................................................................................................16
8.4 Air purging of the piping and indoor unit .................................................................................. 17
8.5 Pumping down (Re-installation) ............................................................................................... 18
8.6 Re-air purging (Re-installation) ................................................................................................19
8.7 Balance refrigerant of the 2-way, 3-way valves........................................................................ 20
8.8 Evacuation ............................................................................................................................... 21
8.9 Gas charging ........................................................................................................................... 22
9. Capacity table ............................................................................................................23
9.1 MSG-24CRN2.......................................................................................................................... 23
9.2 MSG-24HRN2.......................................................................................................................... 23
9.3 MSG-30CRN2.......................................................................................................................... 24
9.4 MSG-30HRN2.......................................................................................................................... 24
10. Electronic function....................................................................................................25
10.1 Electronic control working environment ................................................................................... 25
10.2 Proper symbols and their meaning .......................................................................................... 25
10.3 Function ................................................................................................................................... 25
10.4 Protection................................................................................................................................. 27
10.5 Fan only mode ......................................................................................................................... 27
10.6 Cooling mode........................................................................................................................... 27
10.7 Dehumidifying mode ................................................................................................................ 28
10.8 Heating mode .......................................................................................................................... 28
10.9 Defrosting mode(available for heating mode) .......................................................................... 29
Content
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10.10 Auto mode ............................................................................................................................... 30
10.11 Force cooling function.............................................................................................................. 30
10.12 Sleep mode.............................................................................................................................. 31
10.13 Auto restart function................................................................................................................. 31
11. Model and Parameters ..............................................................................................33
12. Troubleshooting.........................................................................................................34
12.1 Display board........................................................................................................................... 34
12.2 Troubleshooting ....................................................................................................................... 35
12.3 Diagnostic chart ....................................................................................................................... 36
12.4 Resetting phenomenon often occurs during operation............................................................. 37
12.5 Operation lamp flashes and Timer lamp off. ............................................................................ 37
12.6 Operation lamp flashes and Timer lamp on. ............................................................................ 37
12.7 Operation lamp off and Timer lamp flashes ............................................................................. 38
12.8 Operation lamp on and Timer lamp flashes ............................................................................. 38
12.9 Operation lamp flashes, Timer lamp flashes ........................................................................... 38
13. Characteristic of temperature sensor......................................................................39
Service manual
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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
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
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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 nobody could st ep 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.
Service manual
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2. Function
The function will be
operate in any operation
Indoor unit
Operation ON/OFF by remote controller
Room temperature sensor.
Pipe temperature sensor.
Sensing by room temperature
Maintain the room temperature in accordance with the setting temperature.
Room temperature control
Indoor fan is delayed for 5 sec at the starting.
Starting temperature control
Restarting is for approx. 3 minutes..
Time Delay Safety control
High, med, low, breeze.
Indoor fan speed control
Light up in the LED (LCD) for each operation mode.
The unit will decide the louver direction according to operation mode.
Two-direction air vane
The fan is turn to low speed (cooling/heating).
The unit will be turn off after seven hours.
Sleep mode auto control
The function is usually used in rainy days in
springtime or damp areas.
Independent dehumidification
Operation indication Lamps (LED)
The louver can be set at the desired position or swing up and
down automatically
Air flow Direction control
The unit can be change by the room temperature.
Auto mode
Easy clean panel
Flexible wiring connection
Defrost mode
Temp. Compensation
Prevent the cold wind at
the beginning of unit start.
Anti-cold function
Auto-restart function
Self-diag. function
Service manual
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The unit can operate in cooling mode at low ambient temperature conditions.
The unit has 3 mins delay between continuouslyON/OFF operations.
Outdoor unit
Power relay control
Low ambient kit
Bird tail propeller fan makes the outdoor unit run more quietly.
Low noise air flow system
The hydrophilic fin can improve the heating efficiency at operation mode.
Hydrophilic aluminum fin
It is only operated in the heating operation mode except defrosting operation.
Discharge pipe temperature protect
Anti-rust cabinet
Valve protection cover
4 way valve control
Made from electrolytic zinc steel sheet and anti-rust coated components.
It protects the valves and prevents water from dripping.
Service manual
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3. Dimension
3.1 Indoor unit
Dimension
Mode
WH L
24K 1080 330 222
30K 1080 330 222
3.2 Outdoor unit
Dimension
Mode
W H D L1L2L3
24K 845 695 335 560 360 735
30K 845 695 335 560 360 735
Service manual
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4. Specification
MSG-24CRN2 MSG-24HRN2
Ph-V-Hz
1, 220-240V~,50Hz 1, 220-240V~,50Hz
Capacity Btu/h
23000 23000
Input W
2650 2650
Rated current A
12.1 12.1
EER Btu/w.h
8.7, 2.54 8.7, 2.54
Capacity Btu/h
----- 26000
Input W
----- 2570
Rated current A
----- 11.7
COP W/W
----- 2.96
A
16 16
A
54 54
Model
PG420X3CS-4KU1 PG420X3CS-4KU1
Type
Rotary Rotary
Brand
GD Toshiba GD Toshiba
Capacity Btu/h
23400 23400
Input W
2317 2317
Rated current(RLA) A
10.1 10.1
Locked rotor Amp(LRA) A
54 54
Thermal protector
Internal Internal
Capacitor uF
50 50
Refrigerant oil ml
950 950
Model
YDK36-4G YDK36-4G
Brand
Welling Welling
Input W
65/64/62 65/64/62
Capacitor uF
2μF/450V 2μF/450V
Speed(hi/mi/lo) r/min
1050/960/860 1050/960/860
m3/h
1050/950/850 1050/950/850
dB(A)
43/40/37 43/40/37
Model
YDK53-6K YDK53-6K
Brand
Welling Welling
Input W
140 140
Capacitor uF
3.5 3.5
Speed r/min
800 800
m
3
/
h
2500 2500
dB(A)
55 55
g
R22/1850 R22/1900
MPa
2.8 2.8
Liquid side/ Gas side mm
Ф
9.53/Ф16.0
Ф
9.53/Ф16.0
Max. refrigerant pipe length m
20 20
Max. difference in level m
10 10
℃
17-30 17-30
℃
18-45 -7 - 45
m
2
40~56 40~56
Operation temp
Ambient temp
Application area
Outdoor noise level
Refrigerant type R407C
Design pressure
Refrigerant
piping
Indoor air flow (Hi/Mi/Lo)
Indoor noise level (Hi/Mi/Lo)
Outdoor
fan motor
Outdoor air flow
Max. current
Starting current
Compressor
Indoor
fan motor
Model
Power supply
Cooling
Heating
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.
Service manual
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MSG-30CR MSG-30HR
Ph-V-Hz
1, 220-240V~,50Hz 1, 220-240V~,50Hz
Capacity Btu/h
27000 27000
Input W
3230 3230
Rated current A
14.8 14.8
EER Btu/w.h
8.4, 2.45 8.4, 2.45
Capacity Btu/h
----- 32000
Input W
----- 3290
Rated current A
----- 15.1
COP W/W
----- 2.85
A
20 20
A
65 65
Model
HQ034PAA HQ034PAA
Type
Scroll Scroll
Brand
LG LG
Capacity Btu/h
28900 28900
Input W
2833 2833
Rated current(RLA) A
12.8 12.8
Locked rotor Amp(LRA) A
65 65
Thermal protector
Internal Internal
Capacitor uF
60 60
Refrigerant oil ml
750 750
Model
YDK36-4G YDK36-4G
Brand
Welling Welling
Input W
70/66/63 70/66/63
Capacitor uF
3μF/450V 3μF/450V
Speed(hi/mi/lo) r/min
1150/1060/960 1150/1060/960
m3/h
1150/1050/950 1150/1050/950
dB(A)
45/42/39 45/42/39
Model
YDK100-6D YDK100-6D
Brand
Welling Welling
Input W
169 169
Capacitor uF
55
Speed r/min
900 900
m
3
/
h
2600 2600
dB(A)
57 57
g
1800 1850
MPa
2.8 2.8
Liquid side/ Gas side mm
Ф
9.53/Ф16.0
Ф
9.53/Ф16.0
Max. refrigerant pipe length m
20 20
Max. difference in level m
10 10
℃
17-30 17-30
℃
18-45 -7 - 45
m
2
50~68 50~68
Model
Power supply
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
Operation temp
Ambient temp
Application area
Outdoor noise level
Refrigerant type R410A
Design pressure
Refrigerant
piping
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.
Service manual
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MSG-30CR MSG-30HR
Ph-V-Hz
3Ph,380-420V,50Hz 3Ph,380-420V,50Hz
Capacity Btu/h
28000 28000
Input W
3300 3300
Rated current A
5.8 5.8
EER Btu/w.h
8.5, 2.5 8.5, 2.5
Capacity Btu/h
----- 33000
Input W
----- 3300
Rated current A
----- 5.8
COP W/W
----- 2.9
A
7.5 7.5
A
40 40
Model
HQ034YAA HQ034YAA
Type
Scroll Scroll
Brand
LG LG
Capacity Btu/h
29000/29200 29000/29200
Input W
2760/2835 2760/2835
Rated current(RLA) A
5.8/6.2 5.8/6.2
Locked rotor Amp(LRA) A
40 40
Thermal protector
Internal Internal
Capacitor uF
Refrigerant oil ml
750 750
Model
YDK36-4G YDK36-4G
Brand
Welling Welling
Input W
70/66/63 70/66/63
Capacitor uF
3μF/450V 3μF/450V
Speed(hi/mi/lo) r/min
1150/1060/960 1150/1060/960
m3/h
1150/1050/950 1150/1050/950
dB(A)
45/42/39 45/42/39
Model
YDK100-6D YDK100-6D
Brand
Welling Welling
Input W
169 169
Capacitor uF
55
Speed r/min
900 900
m
3
/
h
2600 2600
dB(A)
57 57
g
R22/2250 R22/2450
MPa
2.6 2.6
Liquid side/ Gas side mm
Ф
9.53/Ф16.0
Ф
9.53/Ф16.0
Max. refrigerant pipe length m
20 20
Max. difference in level m
10 10
℃
17-30 17-30
℃
18-45 -7 - 45
m
2
50~68 50~68
Operation temp
Ambient temp
Application area
Outdoor noise level
Refrigerant type R410A
Design pressure
Refrigerant
piping
Indoor air flow (Hi/Mi/Lo)
Indoor noise level (Hi/Mi/Lo)
Outdoor
fan motor
Outdoor air flow
Max. current
Starting current
Compressor
Indoor
fan motor
Model
Power supply
Cooling
Heating
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.
Service manual
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5. Refrigerant cycle diagram
¾ Cooling only
¾ Heat pump mode
Service manual
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6. Operation limits
6.1 Cooling operation
Outdoor unit air temp.℃ DB
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.
Service manual
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7. Schematic diagram and Wiring diagram
7.1 Schematic diagram
Service manual
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7.2 Wiring diagram
7.2.1 Cooling mode
MSG-24CR, MSG-30CR
Service manual
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7.2.2 Heating mode
MSG-24HR, MSG-30HR
A1
A2
Service manual
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7.2.3 Cooling mode (3 Ph)
MSG-30CR (3ph)
Service manual
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7.2.4 Heating mode (3 Ph)
MSG-30HR (3ph)
1
73
4
5
6
2
Service manual
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8. Installation details
8.1 Wrench torque sheet for installation
Torque
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
Outside diameter
8.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Unit 7K 9K 12K 18K 24K 28K
mm2 1.0 1.0 1.5 2.5 2.5 2.5
Grade
8.3 Pipe length and the elevation
Standard
length
Max. Max. Additional
(m) Elevation Elevation refrigerant
Btu/h GAS LIQUID B (m)
A
(m) (g/m)
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
7k~12K
16K~28K
30K~36K
Capacity
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be install per 5-7 meters.
In case that
more than
Service manual
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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.
Service manual
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8.5 Pumping down (Re-installation)
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.
Service manual
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8.6 Re-air purging (Re-installation)
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.
Service manual
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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.
Service manual
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8.8 Evacuation
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
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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9. Capacity table
9.1 MSG-24CRN2
SUMMER
Coolin
g
mod
e
Indoor
Conditions
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D Total capacity kW 6.48 6.09 5.63 5.18 4.85 4.50
15ºC W Sensitive capacity kW 4.73 4.54 4.25 3.94 3.70 3.46
Input kW. 2.27 2.39 2.49 2.69 2.99 3.09
24ºC D Total capacity kW 7.01 6.70 6.26 5.92 5.52 5.08
17ºC W Sensitive capacity kW 5.15 4.99 4.76 4.53 4.25 3.94
Input kW. 2.34 2.47 2.57 2.78 3.08 3.19
27ºC D Total capacity kW 7.47 7.14
6.74
6.37 5.94 5.47
19ºC W Sensitive capacity kW 5.68 5.50
5.26
5.00 4.68 4.32
Input kW. 2.41 2.54
2.65
2.86 3.18 3.29
32ºC D Total capacity kW 8.32 7.98 7.72 7.18 6.56 6.18
23ºC W Sensitive capacity kW 6.41 6.22 6.06 5.67 5.25 5.01
Input kW. 2.51 2.65 2.76 2.98 3.31 3.42
OUTDOOR TEMPERATURE DRY
9.2 MSG-24HRN2
SUMMER
Coolin
g
mod
e
Indoor
Conditions
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D Total capacity kW 6.48 6.09 5.63 5.18 4.85 4.50
15ºC W Sensitive capacity kW 4.73 4.54 4.25 3.94 3.70 3.46
Input kW. 2.27 2.39 2.49 2.69 2.99 3.09
24ºC D Total capacity kW 7.01 6.70 6.26 5.92 5.52 5.08
17ºC W Sensitive capacity kW 5.15 4.99 4.76 4.53 4.25 3.94
Input kW. 2.34 2.47 2.57 2.78 3.08 3.19
27ºC D Total capacity kW 7.47 7.14
6.74
6.37 5.94 5.47
19ºC W Sensitive capacity kW 5.68 5.50
5.26
5.00 4.68 4.32
Input kW. 2.41 2.54
2.65
2.86 3.18 3.29
32ºC D Total capacity kW 8.32 7.98 7.72 7.18 6.56 6.18
23ºC W Sensitive capacity kW 6.41 6.22 6.06 5.67 5.25 5.01
Input kW. 2.51 2.65 2.76 2.98 3.31 3.42
OUTDOOR TEMPERATURE DRY
WINTER
-7ºC D
-8ºC W
Capacity kW
8.99 7.89 7.22 6.34 5.46 4.80
Input kW.
2.76 2.51 2.33 2.16 1.88 1.71
Capacity kW
8.83 7.74 7.05 6.12 5.19 4.49
Input kW.
2.83 2.55 2.37 2.22 1.94 1.73
Capacity kW
8.75
7.62
6.96 5.97 4.91 4.07
Input kW.
2.91
2.57
2.44 2.26 1.99 1.82
Capacity kW
8.67 7.54 6.86 5.88 4.82 3.99
Input kW.
3.01 2.60 2.48 2.35 2.12 1.89
OUTDOOR CONDITIONS
Indoor
Conditions
12ºC D
11ºC W
7ºC D
6ºC W
4ºC D
3ºC W
0ºC D
-1ºC W
-4ºC D
-6ºC W
15ºC
18ºC
20ºC
22ºC
Service manual
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9.3 MSG-30CRN2
SUMMER
Cooling mod
e
Indoor
Conditions
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D Total capacity kW 7.60 7.14 6.61 6.08 5.69 5.28
15ºC W Sensitive capacity kW 5.55 5.33 4.99 4.62 4.34 4.06
Input kW. 2.76 2.91 3.04 3.28 3.64 3.76
24ºC D Total capacity kW 8.23 7.86 7.35 6.94 6.47 5.97
17ºC W Sensitive capacity kW 6.05 5.86 5.58 5.31 4.98 4.62
Input kW. 2.85 3.01 3.13 3.38 3.76 3.89
27ºC D Total capacity kW 8.76 8.38
7.91
7.47 6.97 6.42
19ºC W Sensitive capacity kW 6.66 6.45
6.17
5.87 5.49 5.07
Input kW. 2.94 3.10
3.23
3.49 3.88 4.01
32ºC D Total capacity kW 9.76 9.36 9.06 8.42 7.70 7.25
23ºC W Sensitive capacity kW 7.52 7.30 7.11 6.65 6.16 5.88
Input kW. 3.06 3.22 3.36 3.63 4.03 4.17
OUTDOOR TEMPERATURE DRY
9.4 MSG-30HRN2
SUMMER
Cooling mod
e
Indoor
Conditions
25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D Total capacity kW 7.60 7.14 6.61 6.08 5.69 5.28
15ºC W Sensitive capacity kW 5.55 5.33 4.99 4.62 4.34 4.06
Input kW. 2.76 2.91 3.04 3.28 3.64 3.76
24ºC D Total capacity kW 8.23 7.86 7.35 6.94 6.47 5.97
17ºC W Sensitive capacity kW 6.05 5.86 5.58 5.31 4.98 4.62
Input kW. 2.85 3.01 3.13 3.38 3.76 3.89
27ºC D Total capacity kW 8.76 8.38
7.91
7.47 6.97 6.42
19ºC W Sensitive capacity kW 6.66 6.45
6.17
5.87 5.49 5.07
Input kW. 2.94 3.10
3.23
3.49 3.88 4.01
32ºC D Total capacity kW 9.76 9.36 9.06 8.42 7.70 7.25
23ºC W Sensitive capacity kW 7.52 7.30 7.11 6.65 6.16 5.88
Input kW. 3.06 3.22 3.36 3.63 4.03 4.17
OUTDOOR TEMPERATURE DRY
WINTER
-7ºC D
-8ºC W
Capacity kW
11.07 9.71 8.89 7.81 6.72 5.90
Input kW.
3.53 3.21 2.99 2.76 2.41 2.18
Capacity kW
10.86 9.53 8.67 7.53 6.39 5.53
Input kW.
3.62 3.26 3.03 2.84 2.48 2.22
Capacity kW
10.77
9.38
8.57 7.34 6.04 5.01
Input kW.
3.72
3.29
3.13 2.90 2.55 2.34
Capacity kW
10.67 9.28 8.44 7.24 5.94 4.92
Input kW.
3.85 3.32 3.17 3.01 2.71 2.43
15ºC
18ºC
20ºC
22ºC
OUTDOOR CONDITIONS
Indoor
Conditions
12ºC D
11ºC W
7ºC D
6ºC W
4ºC D
3ºC W
0ºC D
-1ºC W
-4ºC D
-6ºC W
Service manual
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10. Electronic function
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
T1: Indoor ambient temperature
T2: Indoor evaporator temperature
T3: Outdoor condenser temperature.
TS: Setting temperature through the remote controller
I
3sec
: Self-protection amp of compressor, continue three seconds until turns off the compressor.
I
5MIN
: Self-protection amp of compressor, continue five minutes until turns off the compressor.
I
FAN
: Self-protection amp of outdoor fan/indoor fans when they change from higher wind to lower wind.
I
RESTORE
: Amp self-protection return value
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
TE10: Condenser high temperature protection, compressor off temperature.
TE11: Condenser high temperature protection, restoring temperature.
TE14: The indoor restoring temperature when the compressor is off on the heating mode.
TE16: The indoor evaporator temperature after the defrost action, fan on temperature.
TC1: Outdoor condenser sensor temperature for the defrost condition 1.
TC2: Condenser sensor temperature after defrost.
TC3: Outdoor condenser sensor temperature for the defrost condition 2.
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
Service manual
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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
Service manual
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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
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)
Auto fan at cooling mode:
Anti-freezing control to indoor evaporator at cooling mode ( T: evaporator temp. )
Service manual
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TE5 T
EVAP. temp. up
EVAP. temp. down
TE6
Compressor and
outdoor fan on
Compressor and outdoor
fan off (after 5 mins)
Condenser high temperature protection (only for heat pump)
10.7 Dehumidifying mode
Indoor fan speed at low speed.
Protection is same as cooling 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
Service manual
- 29 -
function prevails.
Anti-cold wind control function at heating mode (T=indoor exchanger temp.)
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)
10.9.1 Defrosting condition:
Defrost starts when either of the following:
T3 lower than 0’C, lasts for more than 40 minutes, provided that the time period then the temperature
is lower than -3’C consecutively reaches 3 minutes.
Calculate from the end of latest defrost, evaporator high temp. protection only closes outdoor fan with
Service manual
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the compressor still running. Add up to 90 minutes.
10.9.2 Conditions of defrost ending:
Defrosting ends when either of the following:
The time gets to 10 minutes.
T3>20’C.
The circulation is as following:
10.9.3 Defrosting Actions
Compressor
Outdoor fan
4-way valve
Indoor fan
Defrost 10 or 6 minutes
25s
5s
10s
2s
Remark: when the evaporator pipe temperature sensor more than TE16, the indoor fan start to run.
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).
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℃
Service manual
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Manual operation is controlled by touching buttons and divided into force cooling and forced auto
mode. It transfer between these two modes by pressing the buttons, the cycling order of the button
press is as below graph show to you.
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).
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
Service manual
- 32 -
In case of a sudden power failure, this function automatically sets the unit to previous settings before
the power failure when power returns
Service manual
- 33 -
11. Model and Parameters
Model
MSG-24CR MSG-24HR MSG-30CR MSG-30HR
I3SEC [A]
22 22 26 26
I5MIN [A]
20 20 24 24
IFAN [A]
16 16 20 20
IDEFROST [A]
14 14 18 18
TE1 ['C]
25 25
TE2 ['C]
32 32
TE3 ['C]
30 30
TE4 ['C]
20 20
TE5 ['C]
2222
TE6 ['C]
12 12 12 12
TE7 ['C]
63 63
TE8 ['C]
54 54
TE9 ['C]
50 50
TE10 ['C]
65 65
TE11 ['C]
55 55
TE14 ['C]
32 32
TE16 ['C]
42 42
3Ph 380~420V
Model
MSG-30CR MSG-30HR
I3SEC [A]
26 26
I5MIN [A]
24 24
IFAN [A]
20 20
IDEFROST [A]
18 18
TE1 ['C]
25
TE2 ['C]
32
TE3 ['C]
30
TE4 ['C]
20
TE5 ['C]
22
TE6 ['C]
12 12
TE7 ['C]
63
TE8 ['C]
54
TE9 ['C]
50
TE10 ['C]
65
TE11 ['C]
55
TE14 ['C]
32
TE16 ['C]
42
Service manual
- 34 -
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.
Service manual
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12.2 Troubleshooting
For cooling mode:
Failure phenomenon
Operation
lam
p
Timer
lam
p
Indoor fan speed has been out of control for over 1 minute
☆
X
Indoor room temp. or evaporator sensor is open circuit or short circuit
☆
On
Over current protection of the compressor occurs 4 times X
☆
EEROM error On
☆
No over-zero si
g
nal
☆☆
r
Extinguish
☆
Flash at 5Hz
For heat pump mode:
Failure phenomenon
Operation
lam
p
Timer
lam
p
Defrostin
g
lam
p
Over current protection of the compressor occurs 4 times
☆
X
☆
Indoor fan speed has been out of control for over 1 minute X
☆☆
No over-zero si
g
nal
☆☆☆
Temp. sensor on indoor evaporator is open circuit or short circuit X X
☆
Indoor room temp. sensor is open circuit or short circuit X
☆
X
EEROM erro
r
On
☆
X
r
Extinguish
☆
Flash at 5Hz
Service manual
- 36 -
12.3 Diagnostic chart
After energizing, no indicator is lighted and the air conditioner can’t be operated.
Service manual
- 37 -
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.
Service manual
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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.
Service manual
- 39 -
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
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