Page 1
Cover
MSC-21CRN1; MSC-21HRN1
MSC-24CRN1; MSC-24HRN1
MSC-28CRN1; MSC-28HRN1
Page 2
Content
2
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 ..................................................................................错误！未定义书签。
5. Refrigerant cycle diagram...........................................................................................6
6. Operation limits ...........................................................................................................7
6.1 Cooling operation....................................................................................................................... 7
6.2 Heating operation ...................................................................................................................... 7
7. Schematic diagram and Wiring diagram ...................................................................8
7.1. Schematic diagram .................................................................................................................... 8
7.2. Wiring diagram......................................................................................................................... 10
8. Installation details......................................................................................................12
8.1 Wrench torque sheet for installation......................................................................................... 12
8.2 Connecting the cables ............................................................................................................. 12
8.3 Pipe length and the elevation...................................................................................................12
8.4 Air purging of the piping and indoor unit .................................................................................. 13
8.5 Pumping down (Re-installation) ............................................................................................... 14
8.6 Re-air purging (Re-installation) ................................................................................................15
8.7 Balance refrigerant of the 2-way, 3-way valves........................................................................ 16
8.8 Evacuation ............................................................................................................................... 17
8.9 Gas charging ........................................................................................................................... 18
9. Pressure table............................................................................................................19
9.1 MSC-21CRN1.......................................................................................................................... 19
9.2 MSC-21HRN1.......................................................................................................................... 19
9.3 MSC-24CRN1.......................................................................................................................... 19
9.4 MSC-24HRN1.......................................................................................................................... 19
9.5 MSC-28CRN1.......................................................................................................................... 20
9.6 MSC-28HRN1.......................................................................................................................... 20
10. Capacity table ............................................................................................................21
10.1 MSC-21CRN1 .......................................................................................................................... 21
10.2 MSC-21HRN1 .......................................................................................................................... 21
10.3 MSC-24CRN1 .......................................................................................................................... 22
10.4 MSC-24HRN1 .......................................................................................................................... 22
Page 3
Content
3
10.5 MSC-28CRN1 .......................................................................................................................... 23
10.6 MSC-28HRN1 .......................................................................................................................... 23
11. Electronic function....................................................................................................24
11.1 Proper symbols and their meaning .......................................................................................... 24
11.2 Function ................................................................................................................................... 24
11.3 Protection................................................................................................................................. 24
11.4 Fan-only mode......................................................................................................................... 25
11.5 Cooling mode........................................................................................................................... 25
11.6 Dehumidifying mode ................................................................................................................ 27
11.7 Heating mode .......................................................................................................................... 27
11.8 Defrosting mode(available for heating mode) .......................................................................... 29
11.9 Auto mode ............................................................................................................................... 30
11.10 Force cooling function.............................................................................................................. 30
11.11 Sleep mode.............................................................................................................................. 30
11.12 Auto restart function................................................................................................................. 31
11.13 Turbo mode.............................................................................................................................. 31
11.14 PLASMA ( optional): ................................................................................................................ 31
11.15 Anion( optional)........................................................................................................................ 31
12. Model and Parameters ..............................................................................................32
13. Troubleshooting.........................................................................................................33
13.1 Display board ........................................................................................................................... 33
13.2 Troubleshooting ....................................................................................................................... 33
13.3 Detailed malfunction analyse ................................................................................................... 34
13.4 Malfunction Stat. ...................................................................................................................... 36
14 Characteristic of temperature sensor......................................................................39
Page 4
Page 5
Service manual
1
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
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
unit is so equipped.)
There is risk of physical injury, electric shock, or product
Page 6
Service manual
2
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.
Page 7
Service manual
3
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 at the seventh hour.
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
The function will be operated
in any operation mode.
Plasma(Optional)
Prevent the cold wind at
the beginning of unit start.
Anti-cold function
Auto-restart function
Self-diag. function
UV Generator (Optional)
Oxygen Generator (Optional)
T ele Remote control (Optional)
Anion (Optional)
Page 8
Service manual
4
The unit can operate in cooling mode at low ambient temperature conditions.
The unit has 3 mins delay between continuously ON/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
-
It protects the valves and prevents water from dripping.
Soft starter kit
The unit keep the starting current within the limit of 45A.
Two-speed outdoor fan
With 2 speed fan, the outdoor unit can operate powerfully according to run mode.
Page 9
Service manual
5
3. Dimension
3.1 Indoor unit
3.2 Outdoor unit
Dimension
Mode
W H D
21K 1080 330 225
24K 1080 330 225
28K 1080 330 225
Dimension
Mode
W H D L1 L2 L3
7K 845 695 335 560 360 560
9K 845 695 335 560 360 560
12K 845 695 335 560 360 560
Page 10
Service manual
6
4. Refrigerant cycle diagram
¾ Cooling only
¾ Heat pump mode
Page 11
Service manual
7
5. 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.
Page 12
Service manual
8
6. Schematic diagram and Wiring diagram
7.1. Schematic diagram
Page 13
Service manual
9
Page 14
Service manual
10
7.2. Wiring diagram
7.2.1 MSC-21CRN1, MSC-24CRN1, MSC-28CRN1
Page 15
Service manual
11
7.2.2 MSC-21HRN1, MSC-24HRN1, MSC-28HRN1
Page 16
Service manual
12
7. Installation details
8.1 Wrench torque sheet for installation
Outside diameter Torque
mm inch Kg.m
φ9.52
3/8 4.2
φ12.7
1/2 5.5
φ15.88
5/8 6.6
φ19.05
3/4 6.6
8.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 21K 24K 28K
mm
2
2.5 2.5 2.5
8.3 Pipe length and the elevation
Pipe size
Capacity
Btu/h
GAS LIQUID
Standard
length(m)
Max.
ElevationB
(m)
Max. Pipe
lengthA
(m)
Additional
refrigerant(g/m)
21k~24K
5/8’’ (φ
15.88)
3/8’’ (φ
9.52)
5 10 20 65
28K
5/8’’ (φ
15.88)
3/8’’ (φ
9.52)
5 10 20 65
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 5m.
Page 17
Service manual
13
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.
Page 18
Service manual
14
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 char ge set to the s ervice 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.
Page 19
Service manual
15
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.
Page 20
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.
Page 21
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.
Page 22
Service manual
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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.
Page 23
Service manual
19
8. Pressure table
Note:
The pressure data is from 3 way valve, the pressure data are pressure above atmosphere.
D: Dry bulb temp.
W: Wet bulb temp.
9.1 MSC-21CRN1
Cooling mode Outdoor temperature (Dry bulb temp)
Indoor Conditions Pressure 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D15ºC W Pressure(kg/cm2 ) 8.6 8.7 9.0 9.1 9.5 10.0
24ºC D17ºC W Pressure(kg/cm2) 8.8 9.0 9.4 9.6 10.1 10.6
27ºC D19ºC W Pressure(kg/cm2) 9.0 9.3 9.6 10.1 10.5 11.0
32ºC D23ºC W Pressure(kg/cm2) 9.4 9.8 10.0 10.6 11.0 11.4
9.2 MSC-21HRN1
Cooling mode
Outdoor temperature (Dry bulb temp)
Indoor Conditions Pressure 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D15ºC W Pressure( kg/cm2 ) 8.6 8.7 9.0 9.1 9.5 10.0
24ºC D17ºC W Pressure( kg/cm2 ) 8.8 9.0 9.4 9.6 10.1 10.6
27ºC D19ºC W Pressure( kg/cm2 ) 9.0 9.3 9.6 10.1 10.5 11.0
32ºC D23ºC W Pressure( kg/cm2 ) 9.4 9.8 10.0 10.6 11.0 11.4
Heating mode OUTDOOR CONDITIONS
Indoor Conditions Pressure
12ºC D
º
7ºC Dº0ºC D
-
º
-4ºC D
-
º
-7ºC D
-
º
-15ºC D
-
º
15ºC Pressure( kg/cm
2
)
28.2 27.1 21.5 20.7 20.3 /
18ºC Pressure( kg/cm
2
)
30.8 28.4 24.7 22.9 22.2 /
20ºC Pressure( kg/cm
2
)
31.4 30.1 25.4 24.8 23.3 /
22ºC Pressure( kg/cm
2
)
33.5 31.3 26.4 25.4 23.9 /
9.3 MSC-24CRN1
Cooling mode Outdoor temperature (Dry bulb temp)
Indoor Conditions Pressure 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D15ºC W Pressure( kg/cm2 ) 8.7 8.8 9.0 9.1 9.5 10.1
24ºC D17ºC W Pressure( kg/cm2 ) 8.8 9.0 9.4 9.6 10.1 10.6
27ºC D19ºC W Pressure( kg/cm2 ) 9.1 9.4 9.7 10.1 10.5 11.0
32ºC D23ºC W Pressure( kg/cm2 ) 9.5 9.9 10.1 10.6 11.0 11.5
9.4 MSC-24HRN1
Cooling mode Outdoor temperature (Dry bulb temp)
Indoor Conditions Pressure 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D15ºC W Pressure( kg/cm2 ) 8.7 8.8 9.0 9.1 9.5 10.1
24ºC D17ºC W Pressure( kg/cm2 ) 8.8 9.0 9.4 9.6 10.1 10.6
27ºC D19ºC W Pressure( kg/cm2 ) 9.1 9.4 9.7 10.1 10.5 11.0
32ºC D23ºC W Pressure( kg/cm2 ) 9.5 9.9 10.1 10.6 11.0 11.5
Page 24
Service manual
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Heating mode OUTDOOR CONDITIONS
Indoor Conditions Pressure
12ºC D
11ºC W
7ºC D
6ºC W
0ºC D
-1ºC W
-4ºC D
-6ºC W
-7ºC D
-9ºC W
-15ºC D
-xºC W
15ºC Pressure( kg/cm2 ) 28.4 27.2 21.6 20.8 20.4 /
18ºC Pressure( kg/cm2 ) 30.8 28.6 24.9 23.1 22.4 /
20ºC Pressure( kg/cm2 ) 31.6 30.4 25.6 24.9 23.5 /
22ºC Pressure( kg/cm2 ) 33.7 31.5 26.8 25.6 24.0 /
9.5 MSC-28CRN1
Cooling mode Outdoor temperature (Dry bulb temp)
Indoor Conditions Pressure 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D15ºC W Pressure( kg/cm2 ) 8.9 9.0 9.2 9.3 9.7 10.3
24ºC D17ºC W Pressure( kg/cm2 ) 9.0 9.2 9.6 9.8 10.3 10.8
27ºC D19ºC W Pressure( kg/cm2 ) 9.3 9.6 9.8 10.3 10.7 11.2
32ºC D23ºC W Pressure( kg/cm2 ) 9.7 10.1 10.3 10.8 11.1 11.6
9.6 MSC-28HRN1
Cooling mode Outdoor temperature (Dry bulb temp)
Indoor Conditions Pressure 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
21ºC D15ºC W Pressure( kg/cm2 ) 8.9 9.0 9.2 9.3 9.7 10.3
24ºC D17ºC W Pressure( kg/cm2 ) 9.0 9.2 9.6 9.8 10.3 10.8
27ºC D19ºC W Pressure( kg/cm2 ) 9.3 9.6 9.8 10.3 10.7 11.2
32ºC D23ºC W Pressure( kg/cm2 ) 9.7 10.1 10.3 10.8 11.1 11.6
Heating mode OUTDOOR CONDITIONS
Indoor Conditions Pressure
12ºC D
11ºC W
7ºC D
6ºC W
0ºC D
-1ºC W
-4ºC D
-6ºC W
-7ºC D
-9ºC W
-15ºC D
-xºC W
15ºC Pressure( kg/cm2 ) 28.6 27.4 21.8 20.9 20.6 /
18ºC Pressure( kg/cm2 ) 30.9 28.8 25.0 23.3 22.6 /
20ºC Pressure( kg/cm2 ) 31.8 30.6 25.8 25.0 23.7 /
22ºC Pressure( kg/cm2 ) 33.9 31.7 27.0 25.8 24.2 /
Page 25
Service manual
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9. Capacity table
10.1 MSC-21CRN1
SUMMER OUTDOOR TEMPERATURE DRY
Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Total capacity kW 5.73 5.58 5.43 4.94 4.81 4.59
Sensitive capacity kW 4.49 4.30 4.22 4.00 3.87 3.65
21ºC D
15ºC W
Input kW. 1.72 1.94 2.10 2.30 2.40 2.56
Total capacity kW 6.41 6.13 5.80 5.51 5.38 5.13
Sensitive capacity kW 5.11 4.84 4.77 4.48 4.29 4.08
24ºC D
17ºC W
Input kW. 1.72 1.94 2.10 2.30 2.40 2.56
Total capacity kW 6.76 6.48 6.13 5.90 5.63 5.47
Sensitive capacity kW 5.32 5.10 4.96 4.63 4.49 4.23
27ºC D
19ºC W
Input kW. 1.77 1.97 2.17 2.35 2.46 2.67
Total capacity kW 7.38 7.18 6.73 6.30 6.13 5.80
Sensitive capacity kW 5.46 5.14 5.06 4.75 4.53 4.38
32ºC D
23ºC W
Input kW. 1.82 2.04 2.28 2.44 2.53 2.73
10.2 MSC-21HRN1
SUMMER OUTDOOR TEMPERATURE DRY
Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Total capacity kW 5.73 5.58 5.43 4.94 4.81 4.59
Sensitive capacity kW 4.49 4.30 4.22 4.00 3.87 3.65
21ºC D
15ºC W
Input kW. 1.72 1.94 2.10 2.30
2.40 2.56
Total capacity kW 6.41 6.13 5.80 5.51 5.38 5.13
Sensitive capacity kW 5.11 4.84 4.77 4.48 4.29 4.08
24ºC D
17ºC W
Input kW. 1.72 1.94 2.10 2.30
2.40 2.56
Total capacity kW 6.76 6.48 6.13 5.90 5.63 5.47
Sensitive capacity kW 5.32 5.10 4.96 4.63 4.49 4.23
27ºC D
19ºC W
Input kW. 1.77 1.97
2.17 2.35 2.46 2.67
Total capacity kW 7.38 7.18 6.73 6.30 6.13 5.80
Sensitive capacity kW 5.46 5.14 5.06 4.75 4.53 4.38
32ºC D
23ºC W
Input kW. 1.82 2.04 2.28 2.44
2.53 2.73
WINTER OUTDOOR CONDITIONS
Indoor Conditions
12ºC D
11ºC W
7ºC D
6ºC W
4ºC D
3ºC W
0ºC D
-1ºC W
-4ºC D
-6ºC W
-7ºC D
-8ºC W
Capacity kW 7.94 7.61 7.38 6.85 5.95 5.90
15ºC
Input kW. 2.16
2.10 2.01 1.96 1.70 1.54
Capacity kW 7.82 7.58 7.06 6.71 5.82 5.26
18ºC
Input kW. 2.25
2.19 2.17 2.05 1.81 1.74
Capacity kW 7.61 7.38 6.92 6.57 5.69 5.13
20ºC
Input kW. 2.32
2.28 2.14 2.05 1.85 1.79
Capacity kW 7.33 7.12 6.71 6.37 5.44 5.13
22ºC
Input kW. 2.39
2.30 2.19 2.10 1.90 1.59
Page 26
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10.3 MSC-24CRN1
SUMMER OUTDOOR TEMPERATURE DRY
Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Total capacity kW 6.55 6.37 6.21 5.64 5.49 5.24
Sensitive capacity kW 5.13 4.91 4.83 4.57 4.42 4.17
21ºC D
15ºC W
Input kW. 1.97 2.21 2.40 2.63 2.74 2.93
Total capacity kW 7.33 7.01 6.63 6.30 6.15 5.86
Sensitive capacity kW 5.84 5.53 5.45 5.11 4.91 4.67
24ºC D
17ºC W
Input kW. 1.97 2.21 2.40 2.63 2.74 2.93
Total capacity kW 7.73 7.40 7.03 6.74 6.43 6.25
Sensitive capacity kW 6.08 5.83 5.66 5.29 5.13 4.84
27ºC D
19ºC W
Input kW. 2.02 2.25 2.46 2.69 2.81 3.06
Total capacity kW 8.43 8.20 7.69 7.20 7.00 6.63
Sensitive capacity kW 6.24 5.88 5.78 5.43 5.18 5.01
32ºC D
23ºC W
Input kW. 2.08 2.33 2.61 2.79 2.89 3.12
10.4 MSC-24HRN1
SUMMER OUTDOOR TEMPERATURE DRY
Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Total capacity kW 6.55 6.37 6.21 5.64 5.49 5.24
Sensitive capacity kW 5.13 4.91 4.83 4.57 4.42 4.17
21ºC D
15ºC W
Input kW. 1.97 2.21 2.40 2.63 2.74 2.93
Total capacity kW 7.33 7.01 6.63 6.30 6.15 5.86
Sensitive capacity kW 5.84 5.53 5.45 5.11 4.91 4.67
24ºC D
17ºC W
Input kW. 1.97 2.21 2.40 2.63 2.74 2.93
Total capacity kW 7.73 7.40 7.03 6.74 6.43 6.25
Sensitive capacity kW 6.08 5.83 5.66 5.29 5.13 4.84
27ºC D
19ºC W
Input kW. 2.02 2.25 2.46 2.69 2.81 3.06
Total capacity kW 8.43 8.20 7.69 7.20 7.00 6.63
Sensitive capacity kW 6.24 5.88 5.78 5.43 5.18 5.01
32ºC D
23ºC W
Input kW. 2.08 2.33 2.61 2.79 2.89 3.12
WINTER OUTDOOR CONDITIONS
Indoor Conditions
12ºC D
11ºC W
7ºC D
6ºC W
4ºC D
3ºC W
0ºC D
-1ºC W
-4ºC D
-6ºC W
-7ºC D
-8ºC W
Capacity kW 8.57 8.22 7.97 7.40 6.43 6.37
15ºC
Input kW. 2.34
2.27 2.17 2.12 1.83 1.66
Capacity kW 8.44 8.19 7.62 7.25 6.28 5.68
18ºC
Input kW. 2.43
2.36 2.34 2.22 1.95 1.88
Capacity kW 8.21 7.90 7.47 7.10 6.15 5.54
20ºC
Input kW. 2.51
2.43 2.31 2.22 2.00 1.93
Capacity kW 7.92 7.69 7.25 6.88 5.87 5.54
22ºC
Input kW. 2.58
2.48 2.36 2.27 2.05 1.71
Page 27
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10.5 MSC-28CRN1
SUMMER OUTDOOR TEMPERATURE DRY
Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Total capacity kW 7.64 7.44 7.25 6.58 6.41 6.12
Sensitive capacity kW 5.99 5.73 5.63 5.34 5.16 4.87
21ºC D
15ºC W
Input kW. 2.29 2.58 2.80 3.07 3.19 3.42
Total capacity kW 8.55 8.17 7.74 7.34 7.18 6.84
Sensitive capacity kW 6.81 6.45 6.36 5.97 5.72 5.45
24ºC D
17ºC W
Input kW. 2.29 2.58 2.80 3.07 3.19 3.42
Total capacity kW 9.01 8.63 8.20 7.87 7.50 7.29
Sensitive capacity kW 7.09 6.80 6.61 6.17 5.99 5.64
27ºC D
19ºC W
Input kW. 2.36 2.62 2.90 3.13 3.28 3.56
Total capacity kW 9.84 9.57 8.97 8.40 8.17 7.73
Sensitive capacity kW 7.28 6.86 6.75 6.34 6.04 5.84
32ºC D
23ºC W
Input kW. 2.43 2.72 3.04 3.25 3.37 3.64
10.6 MSC-28HRN1
SUMMER OUTDOOR TEMPERATURE DRY
Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC
Total capacity kW 7.64 7.44 7.25 6.58 6.41 6.12
Sensitive capacity kW 5.99 5.73 5.63 5.34 5.16 4.87
21ºC D
15ºC W
Input kW. 2.29 2.58 2.80 3.07 3.19 3.42
Total capacity kW 8.55 8.17 7.74 7.34 7.18 6.84
Sensitive capacity kW 6.81 6.45 6.36 5.97 5.72 5.45
24ºC D
17ºC W
Input kW. 2.29 2.58 2.80 3.07 3.19 3.42
Total capacity kW 9.01 8.63 8.20 7.87 7.50 7.29
Sensitive capacity kW 7.09 6.80 6.61 6.17 5.99 5.64
27ºC D
19ºC W
Input kW. 2.36 2.62 2.90 3.13 3.28 3.56
Total capacity kW 9.84 9.57 8.97 8.40 8.17 7.73
Sensitive capacity kW 7.28 6.86 6.75 6.34 6.04 5.84
32ºC D
23ºC W
Input kW. 2.43 2.72 3.04 3.25 3.37 3.64
WINTER OUTDOOR CONDITIONS
Indoor Conditions
12ºC D
11ºC W
7ºC D
6ºC W
4ºC D
3ºC W
0ºC D
-1ºC W
-4ºC D
-6ºC W
-7ºC D
-8ºC W
Capacity kW 9.84 9.44 9.15 8.50 7.38 7.32
15ºC
Input kW. 2.68
2.60 2.49 2.43 2.11 1.91
Capacity kW 9.69 9.40 8.75 8.33 7.21 6.53
18ºC
Input kW. 2.79
2.71 2.69 2.54 2.24 2.16
Capacity kW 9.43 9.07 8.58 8.15 7.06 6.36
20ºC
Input kW. 2.88
2.79 2.66 2.54 2.30 2.21
Capacity kW 9.09 8.83 8.33 7.90 6.74 6.37
22ºC
Input kW. 2.96
2.85 2.71 2.60 2.35 1.97
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10. Electronic function
11.1 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
TH
DEFROST
: High wind, defrosting temperature difference
TM
DEFROST
: Middle wind, defrosting temperature difference
TL
DEFROST
: Low wind, defrosting temperature difference
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, compressor restoring on temperature
11.2 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
Anti frozen at cooling mode
11.3 Protection
11.3.1 3 minutes delay at restart for compressor.
11.3.2 Sensor protection at open circuit and breaking disconnection
11.3.3 The malfunction of correspondence in CMOS chip with EEPROM indication.
When the CMOS chip and EEPROM can’t communicate during the time of using EEPROM to select
parameter, the LED shows information of the malfunction (when use jump to select parameter, it
doesn’t have this function). After the showing, the unit can’t go right to work except turning off.
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11.3.4 The current protection of the compressor
If compressor turns off for continuously 4 times due to current protection in 10 minutes from Compressor
On, the unit stops and LED displays failure information and can’t returns to normal operation automatically.
11.3.5 The protection of outdoor unit
The protection of outdoor unit mostly contains: the protection of exhausting temperature, the protection of
exhausting press etc. when any of the protection occur, the outdoor unit exports a signal to indoor unit.
The action of indoor unit: when the indoor unit infers a high-tension signal from outdoor exceeding 3
seconds, the whole unit turns off, come to checking condition, the indoor unit shows the information of
malfunction.(4-way valve turns off 2 minutes after the compressor.
When the indoor unit infers a low-tension signal from outdoor exceeding 3 seconds, the protection remove,
and the unit go right to work.
11.4 Fan-only mode
Fan speed is high/mid/low/ Auto
11.5 Cooling mode
The 4-way valve is closed at cooling mode.
The action of the compressor and the outdoor fan:(T=indoor temperature)
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Auto fan at cooling mode:
Anti-freezing control to indoor evaporator at cooling mode ( T: evaporator temp. )
TE5 T
EVAP. temp. up
EVAP. temp. down
TE6
Compressor and
outdoor fan on
Compressor and outdoor
fan off (after 4 mins)
Condenser high temperature protection (cooling only type don’t have the protection):
This protection only runs in cooling mode, cooling in auto mode and turbo mode
The condition of this protection:
Under the protection the outdoor fan keeps run.
11.6 Dehumidifying mode
The 4-way valve is off in dehumidifying mode
At dehumidifying mode, the unit runs In cooling, the speed of the indoor fan is low, and the speed can’t
change.
At dehumidifying mode, the protection is the same as that of cooling mode.
At dehumidifying mode, the action of step motor is the same as that of cooling mode.
11.7 Heating mode
11.7.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode. 4-way
T3
TE10
TE11
Comp
Compressor on
Comp act
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valve must delay 2 minutes compared with compressor if the compressor changed into non-heating
mode or turned off. 4-way valve doesn't delay in dehumidifying mode
11.7.2 Generally, the outdoor fan is turned off with the on-off action of compressor in heating mode,
except for the defrosting mode or the end of defrost
11.7.3 Action of compressor and outdoor fan motor at heating mode: compressor must run for 4
minutes after starting and then judge temperature. Meanwhile other protections are still valid.
Tc-1
T1-Ts
Room temp. up
Room temp. down
Tc
Compressor and
outdoor fan off
Compressor and
outdoor fan on
Ts
Tc is the temperature of heating mode. The temperature will increase 4℃, 3℃，2℃，1℃，the unit choose
one with the jump JT1,JT2.
JT1 JT2 OFF ON
OFF
1℃ 3℃
ON
2℃ 4℃
11.7.4 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.)
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11.7.5 Auto wind at heating mode (T=indoor temp.)
0
T-Ts
Room temp. up
Room temp. down
2
Low fan
Med fan
11.7.6 Indoor evaporator high-temperature protection at heating mode
11.7.7 The louver opens to Standard Angle ANGLHEAT when power is on for the first time
11.8 Defrosting mode(available for heating mode)
11.8.1 Defrosting condition: Defrosting starts when either of the following ①&②:
① The compressor keeps running under the condition of T3 <0℃(TC1) for 40 minutes or more, beside T3
＜-3℃(TC3) exceed 3 minutes.
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.
11.8.2 Attention: defrosting end or T3≥20℃(TC2) the clock restart.
11.8.3 Ending condition of defrosting
If one of following conditions is satisfied, end the defrost and turn into heating mode:
A. The defrost time has reached to 10 minutes.
B. T3≥TC2（20℃）
11.8.4 Defrosting Actions (In defrosting action the protection of T2’s open circuit and short circuit can’t
run.)
TE7
TE8
TE9
Comp off
Out fan off
Compressor,
out fan off
Compressor,
Out fan on
Compressor on
Out fan on (high)
Out fan low
TE15
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Compressor
Outdoor fan
4-way valve
Indoor fan
Defrost 10 minutes
55s
5s
15s
5s
55s
11.9 Auto mode
11.9.1 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).
-1
TA-TS
2
Heating (fan only for cooling only) Fan only Cooling
11.9.2 The indoor fan blows automatically in corresponding selected mode
11.9.3 The motion of indoor fan’s blade should accord with the selected operation mode
11.9.4 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
11.10 Force cooling function
11.10.1 Select forced cooling function with the forced cooling button or the switch
11.10.2 The compressor is unconditionally turned on, after 30 minutes cooling operation the unit turn to
force auto mode.
11.10.3 All protections of remote control cooling are available at forced cooling operation
11.10.4 Forced Auto function
Select forced auto function with the forced auto button or the switch.
In forced auto status the A/C operates at auto mode with a set temp. of 24℃.
11.11 Sleep mode
11.11.1 The sleep function is available at cooling, heating or auto mode
11.11.2 Cooling:
The set temperature rise 1℃ per hour. Two hours later, the set temperature will maintain as a constant and
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the fan speed is kept at low speed.
The total time is 7 hours, after 7 hours the unit stops
11.11.3 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).
The total time is 7 hours, after 7 hours the unit stops
11.11.4 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.
11.12 Auto restart function
In case of a sudden power failure, this function automatically sets the unit to previous settings before the
power failure when power returns
11.13 Turbo mode
In cooling mode, when pressing the turbo button on the remote controller, the unit will enter turbo mode with
ultra-high speed and reach the set temperature more quickly. After running 20 minutes in turbo mode, the
indoor fan will automatically recover the preset speed.
11.14 PLASMA ( optional):
Starts with indoor fan.
Note: Plasma and Anion can be use together
11.15 Anion( optional)
Starts with indoor fan.
Note: Plasma and Anion can be use together
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11. Model and Parameters
Model MSH-21CRN1 MSH-21HRN1 MSH-24CRN1 MSH-24HRN1 MSH-28CRN1 MSH-28HRN1
I3SEC 14A 14A 14A 14A 18A 18A
I5MIN 20A 20A 20A 20A 24A 24A
IFAN 22A 22A 22A 22A 26A 26A
IRESTORE
IDEFROST
TE1
25℃
25℃
25℃
TE2
32℃
32℃
32℃
TE3
30℃
30℃
30℃
TE4
20℃
20℃
20℃
TE5
2℃ 2℃ 2℃ 2℃ 2℃ 2℃
TE6
12℃ 12℃ 12℃ 12℃ 12℃ 12℃
TE7
63℃
63℃
63℃
TE8
57℃
57℃
57℃
TE9
50℃
50℃
50℃
ANGLCOOL 67 67 67 67 67 67
ANGLHEAT 93 93 93
ANGLOFF 130 130 130 130 130 130
TH
DEFROST
TM
DEFROST
TL
DEFROST
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12. Troubleshooting
13.1 Display board
This indicator illuminates when the air conditioner is in AUTO operation.
AUTO indicator
DE FROST indicator (For Cooling & Heating models only)
This indicator illuminates when the air conditioner starts defrosting automatically or
when the warm air control feature is activated in heating oper ation.
1
22 3
4
5
1
22
3
4
Displays the te mperature settings when the air condition er is operational.
This indicator flashes after power is on and illuminates when the unit is in operation.
This indicator illum inates when TIMER is set ON/OFF
.
O P ERAT ION i n dicator
TIMER indicator
TEMPER ATURE indicator
5
Signal receptor
13.2 Troubleshooting
For models adopting electrical function
Failure phenomenon
Operation
lamp
Timer
lamp
Defrosting
lamp
Auto
lamp
Over current protection of the compressor occurs 4
times
☆ ☆ ☆ ☆
Indoor room temp. sensor is open circuit or short
circuit
X
☆
X X
Temp. sensor on indoor evaporator is open circuit
or short circuit
☆
X X X
Temp. sensor on outdoor condenser is open circuit
or short circuit (without for cooling only models)
X X
☆
X
Outdoor unit protects(outdoor temp sensor, phase
order etc)
X X
☆ ☆
EEROM error X
☆
X
☆
Indoor unit communication err X X X
☆
r Extinguish ☆ Flash at 5Hz
NOTE: For cool only model, the defrosting lamp is replaced with fan lamp, but malfunction display remains.
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13.3 Detailed malfunction analyse
Cu rrent pr ot ec ti on
(LED in dicates)
Chec k t he indoor
air filter.
Does outdoo r heatexchanger frosted?
No
It is normal under
that ambient temp.
Check t he
dra inage
system of
out door unit.
Yes
Does ind oor heat exchan ger frosted?
Yes
Check sp eed
of indoor
motor.
Yes
No
Doe s the outdoor
temp over 48 C ?
o
Check the out door
condenser.
Does it occur in
C ool mode?
Che ck speed
of outdoor
motor.
Yes
Check t he overcurrent protector of
compressor.
No
Re place the
ma in PCB board.
Re place the
compressor.
Recycle the
refrigerant
and recharge .
No
Doe s the indoor
temp low than 1 0 C?
o
Yes
No
Chec k the solenoi d
coil of reverse valve.
C heck t he ove rc urrent protec tor of
compressor.
Replace the
main PCB board.
Recycle the ref rigerant and rec h arge.
R eplace the re verse
valve.
Check the position
and wiring of tem p
sen sor (all of the m).
If wro ng, the unit w ill
result in current
prote ction, not temp.
C heck the soft
st arter mould.
Check the soft
starter m ould.
Indoor/Outdoor Units Communication Protection
Is the L&N connections between
indoor a nd outdoor units correct?
Reconnect correctly.
Is the communication connection good?
Reconnect c orrectly.
Replac e the outdor PCB, then run th e ma chine.
Is the communication protection relieved?
It means that the malfunction is
from indoor unit. Replace the indoor PCB.
Yes
No
No
Yes
Yes
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The unit does not
operate
Does the power LED
li ght afte r tur ning
the switch on?
C heck the elect rical
source.
No
Check the po wer
supplie r.
Does the voltag e
betwee n inpu t
termi nat es o f
transformer i s
correct?
Does the voltag e
betwee n outp ut
termi nat es o f
transformer i s
correct?
D oes the power
tr ans fer to the
di splay board?
Rep lace the main
PCB board.
Yes
Yes
No
Check w iring.
Replac e the
transfo rmer.
No
No
Do the LED lam ps
indicates ERR?
Ye s
Per form
the related
in st ruct io ns.
Yes
No
Is there beep from
the unit when using
remoter?
Check the soft
starter
Ch eck the batter y
of the remoter.
No
Check the display
board .
Replace the
display board.
Yes
No
Replace the
di sp lay b oard .
Yes
Ye s
Does the uni t run in
Forced Cool m ode?
Abnormal n oise
from the indoor unit
Does it happen in
Fan Only mode?
Yes No
Does it happ en with
auto swing?
Check the
swing motor.
Yes
Ch eck the
swing louver.
Check t he fa n
motor.
No
Check the cross flow
fan .
Replace the bear.
Does it just happ en
in the beginning of
coolin g or heat ing
mode?
It is b ecause
of the h eat
rub be tween
plastics parts.
It is normal.
Yes
Check the input
and output pipe.
No
R ecycle the ref riger ant and recharge.
Abnor mal noise
from the outdoor
unit
D oes it happen in
C ool mode?
Yes
Do the fan blade rub
with the shroud?
C hec k t he
motor.
Yes
C hec k t he
fan blad e.
C heck the fixing nuts
of outdoo r unit.
No
Check the
motor
supporter.
Check the capillary.
C heck the
compressor.
No
Re cycle the refrig eran t and recharge.
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13.4 Malfunction Stat.
PROBLEM CAUSE REMEDY
Power failure Check the power cord.
Wiring failure Check the wiring. Replace the terminates or wires if failure.
Transformer failure
Check the input and the output on transformer. Replace if
failure.
Indoor PCB failure Replace after checked failure.
Cross flow fan failure
Replace the fan if cracked, out of balance, or partially
Loose screws Tighten them.
Worn bearings Replace after checked failure.
Motor failure
Replace the motor if knocking sounds continue when
running or loose, or the motor hums or noise appears to be
internal while running.
Fan blade failure
Replace the fan blade if cracked, out of balance, or partially
missing.
Loose screws Tighten them.
Motor failure
Replace the motor if knocking sounds continue when
running or loose, or the motor hums or noise appears to be
internal while running.
Compressor failure
Replace the compressor if sounds coming from inner of the
compressor.
Copper tubing
Remove the cabinet and carefully rearrange tubing not to
contact cabinet, compressor.
Display board or
indoor PCB failure Replace the display board. If it is still false, replace the PCB.
Battery failure
Check the voltage of battery. Replace batteries if the voltage
is lower than 2.3V.
Remote control
failure
Normally, the remote control is not easy to damage. If the
above two methods are not effectual, replace the remote
control.
Lack of refrigerant
Check leakage. Recycle the refrigerant. Correct and
recharge if there is any leakage in the refrigerant system.
Soft starter module
failure
Check the module and the capacitor connected to the
module. Replace if failure.
Overcurrent protector
failure
Check the resistance of compressor overcurrent protector.
Replace if failure.
Outdoor PCB failure Replace after checked failure.
Compressor
protection
Not operating
Indoor abnormal
noise.
Outdoor abnormal
noise.
Remote control
failure.
Page 41
Service manual
37
PROBLEM CAUSE REMEDY
Temperature sensor
Replace after checked failure.
Connector failure or loose Repair or replace the sensor.
Outdoor PCB failure Replace after checked failure.
Temperature sensor
Replace after checked failure.
Connector failure or loose Repair or replace the sensor.
Indoor PCB failure Replace after checked failure.
Soft starter module failure
Check the module and the capacitor connected to the
module. Replace if failure.
Power failure Wait if checked the power voltage is really too low.
Wiring failure Correct if indoor fan motor wiring is loose.
Indoor fan motor failure Check the input of fan motor. Replace if failure.
Indoor PCB failure Replace after checked failure.
Zero-crossing
Indoor PCB failure Replace after checked failure.
Air filter Clean or replace if restricted.
Unit undersized
Determine if the unit is properly sized for the area to be
cooled or heated.
Condenser and
Clean or replace if restricted.
Room structure
Take proper measures to make the door and windows
sealed well if gap is found.
Air flow
Clean or remove if any barrier is found to block the
inlet/outlet wind flow of the unit.
Sunlight Add a awning if the outdoor unit is exposed to the sunlight.
Outdoor fan motor
Check the fan capacitor on outdoor power control board and
replace the board if not within +/-10% of manufacturer's
rating. Replace the motor if the speed is not within +/-10% of
manufacturer's rating but not because of the capacitor.
For electrical function 2.3 models. Check the fan capacitor in
indoor electric box (for some models, the capacitor is on
main PCB.) and replace the capacitor (or main PCB) if not
within +/-10% of manufacturer's rating.
Replace the motor if the speed is not within +/-10% of
manufacturer's rating but not because of the capacitor.
Less refrigerant
Check the tubes for reasons of leakage. Recycle the
refrigerant, correct the leakage points and recharge.
Capillary tube
Regulate the flow if capillary tube is blocked. Make the
evaporating temperature appropriate if the evaporator is
frosted.
Compressor
The inlet and outlet valve of the compressor is damaged,
making the low pressure connected with the high pressure.
The refrigerating system is difficult to produce high pressure
and low pressure. Replace the compressor after checking for
the reason.
Heat sources Reduce if over loaded.
reverse valve
The two paths for refrigerant are connected, making the low
pressure connected with the high pressure. The refrigerating
system is difficult to produce high pressure and low
pressure. Replace the reverse valve after checking for the
Insufficient
cooling or
heating.
indoor fan motor
Open or short
circuit of outdoor
temperature
Room temp or
evap temp sensor
open or short
Over load or too
low voltage
protection
Fan speed
beyond control
Page 42
Service manual
38
PROBLEM CAUSE REMEDY
LED failure Replace the display if checked failure.
Remote control shut the
display
Push the button to turn the display on.
No power Check the voltage. Call an electrician if not within the limit.
Wiring Check the terminals. Repair and correct if loose.
Temperature setting Check and adjust the temperature setting.
Mode setting Check and adjust the mode setting.
Soft starter module failure
Check the module and the capacitor connected to the
module. Replace if failure.
Reverse valve solenoid
coil
Check the reverse valve solenoid coil. Replace the coil if
short, open or damaged.
Reverse valve
If the reverse valve is blocked, the heating mode will not
perform. Replace the reverse valve after checking the
reason.
Water drainage failure Check the drainage pipe and repair if failure.
The indoor unit is incorrect
installed
Correct the installation if not correct.
Drainage pipe blocked Correct it.
The humidity in room is
too high
It's normal if the humidity in the room is over 85%.
Wiring failure Check wiring. Correct if wrong wiring or loosen.
Wire EMC
Check wiring. Correct if the commucication wire is not
shielded wire or twisted with other wires.
Zero-crossing
Outdoor PCB failure Replace if the LED is not on.
Outdoor transformer
Replace if failure.
Indoor PCB failure
Replace the PCB if the photon coupling on indoor PCB is
failure.
Indoor PCB failure Replace after checked failure.
No cooling or
heating.
Water drops from
indoor unit
Insufficient
cooling or heating.
No display on
indoor unit.
Page 43
Service manual
39
14 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 1.830
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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