SERVICE MANUAL
MIDEA AIRCONDITIONER
DC INVERTER
SPLIT WALL-MOUNTED TYPE
MSC-09HRDN1-QD0(E)
MSC-12HRDN1-QC6(E)
MSH-09HRDN1-QD0(E)
MSH-12HRDN1-QC6(E)
V1.2
Apr., 2007
CONTENTS
1. Precaution .................................................................................................................................................... 1
1.1 Safety Precaution................................................................................................................................................1
1.2 Warning ...............................................................................................................................................................1
2. Function........................................................................................................................................................ 4
3. Dimension .................................................................................................................................................... 6
3.1 Indoor Unit...........................................................................................................................................................6
MSC-09HRDN1-QD0(E) MSC-12HRDN1-QC6(E)....................................................................................6
MSH-09HRDN1-QD0(E) MSH-12HRDN1-QC6(E)....................................................................................6
3.2 Outdoor Unit........................................................................................................................................................7
MOC-09HDN1-QD0(E) MOC-12HDN1-QC6(E)...................................................................................7
4. Specification ................................................................................................................................................ 8
5. Refrigerant cycle diagram ........................................................................................................................ 10
6. Wiring diagram............................................................................................................................................11
6.1 Indoor Unit......................................................................................................................................................... 11
MSC-09HRDN1-QD0(E) MSC-12HRDN1-QC6(E).................................................................................... 11
MSH-09HRDN1-QD0(E) MSH-12HRDN1-QC6(E).................................................................................... 11
6.2 Outdoor Unit......................................................................................................................................................12
MOC-09HDN1-QD0(E) MOC-12HDN1-QC6(E) .............................................................................................12
7. Installation details...................................................................................................................................... 13
7.1 Wrench torque sheet for installation..................................................................................................................13
7.2 Connecting the cables.......................................................................................................................................13
7.3 Pipe length and the elevation ............................................................................................................................13
7.4 Air purging of the piping and indoor unit............................................................................................................14
7.5 Pumping down (Re-installation).........................................................................................................................15
7.6 Re-air purging (Re-installation)..........................................................................................................................16
7.7 Balance refrigerant of the 2-way, 3-way valves ................................................................................................. 17
7.8 Evacuation......................................................................................................................................................... 18
7.9 Gas charging.....................................................................................................................................................19
8. Operation characteristics ......................................................................................................................... 20
8.1 MSC-09HRDN1-QD0(E)....................................................................................................................................20
8.2 MSC-12HRDN1-QC6(E)....................................................................................................................................21
8.3 MSH-09HRDN1-QD0(E)....................................................................................................................................22
8.4 MSH-12HRDN1-QC6(E)....................................................................................................................................23
9. Electronic function .................................................................................................................................... 24
9.1 Abbreviation.......................................................................................................................................................24
9.2 Display function.................................................................................................................................................24
9.3 Protection..........................................................................................................................................................25
9.4 Fan-Only Mode.................................................................................................................................................. 25
9.5 Cooling Mode ....................................................................................................................................................26
9.6 Drying mode......................................................................................................................................................27
9.7 Heating mode....................................................................................................................................................27
9.8 Auto mode function............................................................................................................................................30
9.9 Forced operation function.................................................................................................................................. 31
9.10 Action of 4-way valve.......................................................................................................................................31
9.11 Two speeds outdoor fan function.....................................................................................................................31
9.12 Timer function.................................................................................................................................................. 31
9.13 Sleep function mode........................................................................................................................................ 31
9.14 Auto-Restart function....................................................................................................................................... 32
9.15 Ionizer/Plasma dust collector function(optional) ..............................................................................................32
9.16 Outdoor chassis heating cable (optional).........................................................................................................32
10. Troubleshooting....................................................................................................................................... 33
10.1 Indoor Unit Error Display.................................................................................................................................34
10.2 Outdoor Unit Error Display...............................................................................................................................34
10.3 Diagnosis and Solution.................................................................................................................................... 36
10.4 Key parts checking..........................................................................................................................................39
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
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
1
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 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 step
on or fall onto the outdoor unit.
This could result in personal injury and product
damage.
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.
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
2
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
3
The mode can be change by the room temperature.
Turbo wind, high, med, low, breeze.
Restarting is for approx. 3 minutes..
2. Function
Indoor unit
Room temperature sensor.
Pipe temperature sensor.
Maintain the room temperature in accordance w
ith the setting temperature.
Prevent the water being freezed on evaporator by sensing
the evaporator pipe temperature in cooling mode
Operation by remote controller
Sensing by room temperature
Room temperature control
Anti-freezing control in cooling
Ionizer (Optional)
Time Delay Safety control
Indoor fan speed control
Two-direction air vane
The unit will decide the louver direction according to
operation mode.
Sleep mode auto control
The fan is turn to low speed (cooling/heating).
The unit will be turn off at the seventh hour.
Independent dehumidification
The function is usually used in rainy days in
springtime or damp areas.
Air flow Direction control
The louver can be set at the desired position or
swing up and down automatically
Plasma (Optional)
Tele Remote control (Optional)
Work voltage (160V-253V)
Self-diag. function
Anti-cold function
Prevent the cold wind at the
beginning of unit start.
Auto defrost
Auto-restart function
Auto mode
Temp. Compensation
4
When the power supply is
interrupted and then restore, the air
conditioners automatically restore
the previous function setting.
Flexible wiring connection
I
t protects the valves and prevents water from dripping.
The hydrophilic fin can improve the heating efficiency at operation mode.
It is only operated in the heating operation mode except defrosting operation.
Made from electrolytic zinc steel sheet and anti
-
rust coated components.
Bird tail propeller fan makes the outdoor unit run more quietly.
Outdoor unit
Power relay control
The unit has 3 mins delay between continuously ON/OFF operations.
Low noise air flow system
Hydrophilic aluminum fin
4 way valve control
Anti-rust cabinet
Valve protection cover
Discharge pipe temperature protect
Heating cable (Optional)
Driving heating at -15℃
5
3. Dimension
3.1 Indoor Unit
MSC-09HRDN1-QD0(E) MSC-12HRDN1-QC6(E)
MSH-09HRDN1-QD0(E) MSH-12HRDN1-QC6(E)
6
3.2 Outdoor Unit
MOC-09HDN1-QD0(E) MOC-12HDN1-QC6(E)
7
Indoor
MSC-09HRDN1
-
QD0(E)
MSC-12HRDN1
-
QC6(E)
Outdoor
MOC-09HDN1
-
QD0(E)
MOC-12HDN1
-
QC6(E)
Power supply
Ph-V-Hz
1,220
-
240V~,50Hz
1, 220
-
240V~, 50Hz
Capacity
Btu/h 9000(3100~11200)
12000(3800~14700)
Input W 660(300~1100)
970(400~1480)
Rated current
A
2.9(1.3~4.8)
4.3(1.8~6.5)
EER Btu/w.h, w/w
13.6,4.0
12.4, 3.62
Capacity
Btu/h 10000(3300~12300)
13000(4000~15200)
Input W 690(310~1150)
950(390~1460)
Rated current
A 3.0(1.4~5.0)
4.2(1.7~6.4)
COP W/W 4.2 4
Moisture Removal
L/h 0.8 1.2
Max. input consumption
W
1500 1600
Max. current
A 8
8.5
Starting current
A
3.2 4.5
PTC Heater(optional)
W 85 85
Model
DA108X1C
-
20FZ3
DA108X1C
-
20FZ3
Type
Rotary
Rotary
Brand
TOSHIBA
TOSHIBA
Capacity
Btu/h 10918
10918
Input W 855 855
Rated current(RLA)
A
5.3 5.3
Locked rotor Amp(LRA)
A 8 8
Thermal protector
CS-74 CS-74
Capacitor
uF No No
Refrigerant oil
ml
480 480
Model
RPG20D
RPG20D
Brand
Welling
Welling
Input W 38 38
Capacitor
uF
1.5 1.5
Speed(hi/mi/lo)
r/min 1150/1000/800
1250/1060/800
Indoor air flow (Hi/Mi/Lo)
m3/h 590/470/325
615/485/325
Indoor noise level (Hi/Mi/Lo)
dB(A)
41/35/30
43/37/30
Dimension (W*H
*D) mm 790*265*193
790*265*193
Packing (W*H*D)
mm
875*375*285
875*375*285
Net/Gross weight
Kg
8.5/10.5
9.0/11.0
Model
YDK24
-6G
YDK24
-6G
Brand
Welling
Welling
Input W 59 59
Capacitor
uF
2.5 2.5
Speed
r/min 800/550
800/550
Outdoor air flow
m3/h 1650/1060
1650/1060
Outdoor noise level
dB(A)
52 54
Dimension(W*H*D)
mm
760*590*285
760*590*285
Packing (W*H*D)
mm
887*655*355
887*655*355
Net/Gross weight
Kg
40.5/43
40.5/43
Refrigerant type R410A
g
1230 1230
Liquid side/ Gas side
mm(inch)
Ф6.35/Ф9.53
Ф6.35/Ф12.7
Max. refrigerant pipe length
m 15 15
Max. difference in level
m 8 8
Operation temp
17 ~ 30 17 ~ 30
Ambient temp
-
15 ~ 50
-15 ~ 50
4. Specification
Cooling
Heating
Compressor
Indoor fan motor
Indoor unit
Outdoor fan motor
Outdoor unit
Refrigerant piping
8
℃
℃
Indoor
MSH-09HRDN1
-
QD0(E)
MSH-12HRDN1
-
QC6(E)
Outdoor
MOC-09HDN1
-
QD0(E)
MOC-12HDN1
-
QC6(E
)
Power supply
Ph-V-Hz
1,220
-
240V~,50Hz
1, 220
-
240V~, 50Hz
Capacity
Btu/h 9000(3100~11200)
12000(3800~14700)
Input W 660(300~1100)
970(400~1480)
Rated current
A
2.9(1.3~4.8)
4.3(1.8~6.5)
EER Btu/w.h, w/w
13.6,4.0
12.4, 3.62
Capacit
y Btu/h 10000(3300~12300)
13000(4000~15200)
Input W 690(310~1150)
950(390~1460)
Rated current
A
3.0(1.4~5.0)
4.2(1.7~6.4)
COP W/W 4.2 4
Moisture Removal
L/h 0.8 1.2
Max. input consumption
W
1500 1600
Max. current
A 8
8.5
Starting current
A
3.2 4.5
PTC Heater(optional)
W 85 85
Model
DA108X1C
-
20FZ3
DA108X1C
-
20FZ3
Type
Rotary
Rotary
Brand
TOSHIBA
TOSHIBA
Capacity
Btu/h 10918
10918
Input W 855 855
Rated current(RLA)
A
5.3 5.3
Locked rotor Amp(LRA)
A 8 8
Thermal protector
CS-74 CS-74
Capacitor
uF No No
Refrigerant oil
ml
480 480
Model
RPG20D
RPG20D
Brand
Welling
Welling
Input W 38 38
Capacitor
uF
1.5 1.5
Speed(hi/mi/lo)
r/min 1150/1000/800
1250/1060/800
Indoor air flow (Hi/Mi/Lo)
m3/h 650/5
15/375
675/520/375
Indoor noise level (Hi/Mi/Lo)
dB(A)
41/35/30
43/37/30
Dimension (W*H*D)
mm
810*282*215
810*282*215
Packing (W*H*D)
mm
915*360*290
915*360*290
Net/Gross weight
Kg
9.5/11.5
9.5/11.5
Model
YDK24
-6G YDK24-6G
Brand
Welling
Welling
Input W 59 59
Capacitor
uF
2.5 2.5
Speed
r/min 800/550
800/550
Outdoor air flow
m3/h 1650/1060
1650/1060
Outdoor noise level
dB(A)
52 54
Dimension(W*H*D)
mm
760*590*285
760*590*285
Packing (W*H*D)
mm
887*655*355
887*655*355
Net/Gross weight
Kg
40.5/43
40.5/43
Refrigerant type R410A
g
1230 1230
Liquid side/ Gas side
mm(inch)
Ф6.35/Ф9.53
Ф6.35/Ф12.7
Max. refrigerant pipe length
m 15 15
Max. difference in level
m 8 8
Operation
temp
17 ~ 30 17 ~ 30
Ambient temp
-
15 ~ 50
-15 ~ 50
Cooling
Heating
Compressor
Indoor fan motor
Indoor unit
Outdoor fan motor
Outdoor unit
Refrigerant piping
The above design and specifications are subject to change without prior notice for product improvement.
9
℃
℃
5. Refrigerant cycle diagram
10
6. Wiring diagram
6.1 Indoor Unit
MSC-09HRDN1-QD0(E) MSC-12HRDN1-QC6(E)
MSH-09HRDN1-QD0(E) MSH-12HRDN1-QC6(E)
11
6.2 Outdoor Unit
MOC-09HDN1-QD0(E) MOC-12HDN1-QC6(E)
12
7. Installation details
7.1 Wrench torque sheet for installation
Outside diameter Torque
mm inch Kgf.m
Ф6.35 1/4 1.8
Ф9.52 3/8 4.2
Ф12.7 1/2 5.5
Ф15.88 5/8 6.6
7.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit
2
mm
7.3 Pipe length and the elevation
Capacity
7k~12K
18K~28K
Btu/h
3/8’’ (Ф9.52)
1/2’’ (Ф12.7)
1/2’’ (Ф12.7)
5/8’’ (Ф15.88)
5/8’’ (Ф15.88)
Pipe size
Gas Liquid
1/4’’ (Ф6.35)
1/4’’ (Ф6.35)
1/4’’ (Ф6.35)
1/4’’ (Ф6.35)
3/8’’ (Ф9.52)
7K 9K 12K
1.5 1.5 1.5
Standard
length
(m)
5 8 15 30
5 8 15 30
5 8 15 30
5 10 20 30
5 10 20 65
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be installed per 5-7 meters.
13
7.4 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 kgf.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.
14
7.5 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.
5. Air purging of the charge hose.
Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
6. Set the 2-way valve to the close position.
7. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
8. 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.
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 kgf.m.
Be sure to check for gas leakage.
15
7.6 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 minute; 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 indicates 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.
16
7.7 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
0.1Mpa.
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 an evacuation.
Discharge the refrigeration gradually; if it is discharged too suddenly, the refrigeration oil sill be discharged.
17
7.8 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.
18
7.9 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.
19
8. Operation characteristics
8.1 MSC-09HRDN1-QD0(E)
Cooling Characteristics
2.74
2.68
2.62
2.56
2.50
2.44
Cooling Capacity(KW)
2.38
2.32
0.72
0.70
0.68
0.66
0.64
0.62
0.60
Cooling Power Input(KW)
Outdoor Ambient Temperature( )℃
Remark: Indoor room temperature: 27/19℃
Indoor fan speed: High
Pipe length: 5m
Piping Length Characteristics(Cooling)
2.58
2.54
2.50
2.46
2.42
2.38
Cooling Capacity(KW)
2.34
2.30
0.660
0.655
0.650
0.645
0.640
0.635
0.630
Cooling Power Input(KW)
11
10
35 37 39 41 43 25 27 29 31 33
Piping Length (m)
Remark: Indoor room temperature: 27/19℃
Outdoor temperature: 35℃
Indoor fan speed: High
12 13 14 5 6 7 8 9
15
Heating Characteristics
3.1
3.2
2.9
2.8
2.7
2.6
Heating Capacity(KW)
2.5
2.4
1.05
0.95
0.85
0.75
0.65
0.55
0.45
Heating Power Input(KW)
Outdoor Ambient Temperature( )℃
Remark: Indoor room temperature: 20℃
Indoor fan speed: High
Pipe length: 5m
Piping Length Characteristics(Heating)
3.0
2.9
2.8
2.7
2.6
2.5
Heating Capacity(KW)
2.4
2.3
0.68
0.67
0.66
0.65
0.64
0.63
0.62
Heating Power Input(KW)
11
10
3 5 7 9 11 -7 -5 -3 -1
1
Piping Length (m)
Remark: Indoor room temperature: 20℃
Outdoor temperature: 7/6℃
Indoor fan speed: High
12 13 14 5 6 7 8 9
15
20
8.2 MSC-12HRDN1-QC6(E)
Cooling Characteristics
3.7
3.6
3.5
3.4
3.3
3.2
Cooling Capacity(KW)
3.1
3.0
1.08
1.04
1.00
0.96
0.92
0.88
0.84
Cooling Power Input(KW)
Outdoor Ambient Temperature( )℃
Remark: Indoor room temperature: 27/19℃
Indoor fan speed: High
Pipe length: 5m
Piping Length Characteristics(Cooling)
3.50
3.44
3.38
3.32
3.26
3.20
Cooling Capacity(KW)
3.14
3.08
0.97
0.96
0.95
0.94
0.93
0.92
0.91
Cooling Power Input(KW)
11
10
35 37 39 41 43 25 27 29 31 33
Piping Length (m)
Remark: Indoor room temperature: 27/19℃
Outdoor temperature: 35℃
Indoor fan speed: High
12 13 14 5 6 7 8 9
15
Heating Characteristics
3.9
3.8
3.7
3.6
3.5
3.4
Cooling Capacity(KW)
3.3
3.2
1.15
1.10
1.05
1.00
0.95
0.90
0.85
Heating Power Input(KW)
Remark: Indoor room temperature: 20℃
Indoor fan speed: High
Pipe length: 5m
3 5 7 9 11 -7 -5 -3 -1
1
Outdoor Ambient Temperature( )℃
Piping Length Characteristics(Heating)
3.8
3.7
3.6
3.5
3.4
3.3
Cooling Capacity(KW)
3.2
3.1
1.00
0.98
0.96
0.94
0.92
0.90
0.88
Heating Power Input(KW)
11
10
12 13 14 5 6 7 8 9
Piping Length (m)
Remark: Indoor room temperature: 20℃
Outdoor temperature: 7/6℃
Indoor fan speed: High
15
21
8.3 MSH-09HRDN1-QD0(E)
Cooling Characteristics
2.74
2.68
2.62
2.56
2.50
2.44
Cooling Capacity(KW)
2.38
2.32
0.72
0.70
0.68
0.66
0.64
0.62
0.60
Cooling Power Input(KW)
Outdoor Ambient Temperature( )℃
Remark: Indoor room temperature: 27/19℃
Indoor fan speed: High
Pipe length: 5m
Piping Length Characteristics(Cooling)
2.58
2.54
2.50
2.46
2.42
2.38
Cooling Capacity(KW)
2.34
2.30
0.660
0.655
0.650
0.645
0.640
0.635
0.630
Cooling Power Input(KW)
11
10
35 37 39 41 43 25 27 29 31 33
Piping Length (m)
Remark: Indoor room temperature: 27/19℃
Outdoor temperature: 35℃
Indoor fan speed: High
12 13 14 5 6 7 8 9
15
Heating Characteristics
3.1
3.2
2.9
2.8
2.7
2.6
Cooling Capacity(KW)
2.5
2.4
1.05
0.95
0.85
0.75
0.65
0.55
0.45
Heating Power Input(KW)
Outdoor Ambient Temperature( )℃
Remark: Indoor room temperature: 20℃
Indoor fan speed: High
Pipe length: 5m
Piping Length Characteristics(Heating)
3.0
2.9
2.8
2.7
2.6
2.5
Cooling Capacity(KW)
2.4
2.3
0.68
0.67
0.66
0.65
0.64
0.63
0.62
Heating Power Input(KW)
11
10
3 5 7 9 11 -7 -5 -3 -1
1
Piping Length (m)
Remark: Indoor room temperature: 20℃
Outdoor temperature: 7/6℃
Indoor fan speed: High
12 13 14 5 6 7 8 9
15
22
8.4 MSH-12HRDN1-QC6(E)
Cooling Characteristics
3.7
3.6
3.5
3.4
3.3
3.2
Cooling Capacity(KW)
3.1
3.0
1.08
1.04
1.00
0.96
0.92
0.88
0.84
Cooling Power Input(KW)
Outdoor Ambient Temperature( )℃
Remark: Indoor room temperature: 27/19℃
Indoor fan speed: High
Pipe length: 5m
Piping Length Characteristics(Cooling)
3.50
3.44
3.38
3.32
3.26
3.20
Cooling Capacity(KW)
3.14
3.08
0.97
0.96
0.95
0.94
0.93
0.92
0.91
Cooling Power Input(KW)
11
10
35 37 39 41 43 25 27 29 31 33
Piping Length (m)
Remark: Indoor room temperature: 27/19℃
Outdoor temperature: 35℃
Indoor fan speed: High
12 13 14 5 6 7 8 9
15
Heating Characteristics
3.9
3.8
3.7
3.6
3.5
3.4
Cooling Capacity(KW)
3.3
3.2
1.15
1.10
1.05
1.00
0.95
0.90
0.85
Heating Power Input(KW)
Remark: Indoor room temperature: 20℃
Indoor fan speed: High
Pipe length: 5m
3 5 7 9 11 -7 -5 -3 -1
1
Outdoor Ambient Temperature( )℃
Piping Length Characteristics(Heating)
3.8
3.7
3.6
3.5
3.4
3.3
Cooling Capacity(KW)
3.2
3.1
1.00
0.98
0.96
0.94
0.92
0.90
0.88
Heating Power Input(KW)
11
10
12 13 14 5 6 7 8 9
Piping Length (m)
Remark: Indoor room temperature: 20℃
Outdoor temperature: 7/6℃
Indoor fan speed: High
15
23
9. Electronic function
9.1 Abbreviation
T1: Indoor ambient temperature
T2: Pipe temperature of indoor heat exchanger
T3: Pipe temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
9.2 Display function
9.2.1 Icon explanation on indoor display board.
MSC-09HRDN1-QD0(E) MSC-12HRDN1-QC6(E)
MSH-09HRDN1-QD0(E) MSH-12HRDN1-QC6(E)
① Auto indicator
This indicator illuminates when the air conditioner is in AUTO operation.
② Timer indicator
This indicator illuminates when TIMER is set ON/OFF.
③ PRE.-DEF. Indicator
This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air
control feature is activated in heating mode.
④ TEMPERATURE indicator
Usually it displays the temperature settings. When change the setting temperature, this indicator begins
to flash, and stops 20 seconds later.
It displays the room temperature when the air conditioner is in FAN only operation, and the range of that
is 0~50℃. When the unit stops operation, it returns to original factory settings.
Displays the malfunction code or protection code.
⑤ Frequency indicator
This indicator appears only when the compressor is in operation and indicates the current
operating frequency.
24
9.2.2 LED display control function.
Pressing “LED display” button on remote controller will turn off all displays on indoor unit, while pressing once
again, all displays will resume.
9.2.3 Display function in outdoor unit.
9.3 Protection
9.3.1 Three Minutes Delay at restart for compressor.
9.3.2 Temperature protection of compressor top.
9.3.3 If the temperature of compressor top is too high(higher than 115℃ and the Over-load Protector is cut, the units
stop. When the Over-load Protector restore and close(lower than 100℃), the compressor will restart( in this case
the compressor is restricted by Three Minutes Delay protection.
9.3.4 Temperature protection of compressor exhaust.
If the exhaust temp. of compressor is higher than 115℃ and lasts for 5 seconds, the compressor stops and does
not resume until the exhaust temp. is lower than 90℃.
9.3.5 Inverter module Protection, Inverter module Protection itself has a protection function against current, voltage and
temperature. If these protections happened, the corresponding code will display on indoor unit LED.
9.3.6 Sensor protection at open circuit and breaking disconnection
9.3.7 Fan Speed is out of control. When Indoor Fan Speed is too low (lower than 300RPM for 60 seconds), the unit
stops and LED displays failure information and can’t return to normal operation automatically.
9.3.8 Cross Zero signal error warning. If there are 20 alternations of Cross Zero signals are incorrect, the unit stops and
LED displays failure information. After resuming, the motor rotates again. The spacing of Cross Zero signal is
6-13ms.
9.3.9 Indoor fan delayed open function
9.3.10 For all modes, when the units are turned on, the indoor fan can operate 10 seconds after the action of louver.
9.3.11 Compressor preheating function.
1) Preheating permitting condition:
If T4(outdoor ambient temperature)＜3℃ and the machine connects to power supply newly or if T4＜3℃
and compressor has stopped for over 3 hours, the compressor heating cable will work.
2) Preheating mode:
A weak current flows through the coil of compressor from the wiring terminal of compressor, then the
compressor is heated without operation.
3) Preheating release condition:
If T4＞5℃ or user turns on the machine and compressor runs, preheating function will stop.
9.3.12 Compressor heating cable
If outdoor temperature(sensed by outdoor thermostat) is lower than 5℃, the thermostat closes and compressor
heating cable begins to work. If outdoor temperature is higher than 15℃, the thermostat opens and compressor
heating cable stopping working.
9.4 Fan-Only Mode
9.4.1 Temperature setting function is disabled, and no setting temperature display.
9.4.2 In this mode, the action of louver is the same as in cooling mode.
25
9.4.3 The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24℃ setting temperature.
℃
3.5
3.0
1.5
T1 – 24
1.0
high
medium
low
9.5 Cooling Mode
9.5.1 The After start the operation frequency of compressor submits to following rule.
3.5
3.0
-0.5
-1.0
∆T=(room temp) – (setting Temp)
A
B
H
When the machine is running and ∆T(=room temp. – setting temp.) changes, the frequency of compressor will
rise or descend a grade (7 minutes after starting).
After start, if ∆T stays in a zone for 3 minutes, the frequency will change as follow:
Zone A : Current frequency rise a grade till the maximum grade.
Zone B: Elevate or keep or descend the frequency of compressor.
Zone H: Compressor stops after running as the minimum frequency for 60 minutes or ∆T is less than -2℃.
9.5.2 Indoor heat exchanger anti-freezing function.
If T2 is lower than 0℃, the compressor stops and resumes when T2>5℃.
9.5.3 Outdoor unit current control in cooling mode(refer to the parameter table)
I3COOL
comp. pause
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
outdoor unit current
I2COOL
I1COOL
Remark:
I1COOL I2COOL I3COOL
9K Model 4.5 A 5.5 A 6.5 A
12K Model 5.2 A 6.4 A 7.5 A
9.5.4 Rating capacity test function
1) Set the indoor unit with remote controller as: high fan, 17℃ in cooling mode, then press “TURBO” button on
26
controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine
will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds continuously. Also,
indoor fan will change to rating speed, the frequency of compressor will be fixed as rating value. Any
condition of above is not satisfied, the machine can not be turned into rating capacity test mode.
2) The machine will quit from the rating capacity test mode if running for 5 hours or changing fan speed or
setting temperature.
9.5.5 Turbo function(press the “TURBO” button on remote controller)
1) Elevate current frequency to a higher grade.
2) Indoor fan turns to turbo speed.
3) After running for 30 minutes the machine will turn back to previous setting mode.
9.5.6 Indoor fan operation rule.
1) In cooling mode, indoor fan runs all the time and the speed can be selected as high,
medium, low and auto.
2) Auto fan in cooling mode acts as follow:
℃
4.0
3.0
1.5
1.0
9.5.7 Condenser high temperature protection function(in cooling and drying mode)
If T3＞60℃ for 5 seconds, compressor will stop immediately, and the machine will not resume until T3＜52℃.
∆T=(oom temp) – (setting Temp)
high
medium
low
9.6 Drying mode
9.6.1 Indoor fan speed is fixed at breeze grade and can’t be changed. The horizontal angle is the same as in cooling
mode.
9.6.2 Room overlow temperature protection
In drying mode, if room temperature is lower than 10℃, compressor will stop and not resume until room
temperature climbs up to 12℃.
9.6.3 Evaporator anti-freezing protection, condenser high temperature protection and outdoor unit frequency limit are
valid, and they are the same as that in cooling mode.
9.6.4 Horizontal louver action is the same as that in cooling mode.
9.7 Heating mode
9.7.1 Indoor fan action:
1) Anti-cold-wind function.
27
℃
44
38
37
34
33
Evaporator temp
24
17
2) If the compressor stops caused by room temperature rising, indoor fan will be forced to run 127 seconds
with breeze. During this period, anti-cold-wind is disabled. After this, anti-cold –wind function is available.
3) If the machine runs in rating capacity test mode, indoor fan runs with rating speed, and anti-cold-wind is
disabled.
9.7.2 Indoor fan speed can be set as high, medium, low or auto grade, but anti-cold-wind function is preferential.
Auto fan action in heating mode.
setting fan speed
low fan
breeze
super breeze
fan stop
℃
2.5
2.0
1.5
1.0
∆T=(oom temp) – (setting Temp)
low
medium
high
9.7.3 After 7minutes start the operation frequency of compressor submits to following rule:
℃
5.0
4.5
1.0
0.5
∆Th=(room temp) – (setting Temp) –∆Tcon
Remark: ∆Tcon can be changed among 0, -2,- 4 , the default is 0℃ ℃
H
B
A
1) When the machine runs, if ∆Th stays in a zone for 3 minutes, action of frequency is as follow:
Zone A: Elevate current frequency one grade, and not stop until the maximum grade.
Zone B: Elevate or keep or descend current frequency.
Zone H: Compressor stops after running with F1 for 60 minutes or when ∆Th＞6℃.
2) Temperature difference (∆Tcon) choice.
After power on, the machine will self-diagnose, and if there are no J1 and J2 jump wires, ∆Tcon will be set
as 0℃.
28
J1
on on off off
J2 on off on off
∆Tcon(℃) 0 -4 -2 0
9.7.4 Outdoor unit current control in heating mode.
comp. pause
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
outdoor unit current
I3HEAT
I2HEAT
I1HEAT
Remark:
I1HEAT I2 HEAT I3 HEAT
9K Model 5.2 A 6.4 A 7.5 A
12K Model 5.2 A 6.4 A 7.5 A
9.7.5 Indoor heat exchanger high temperature protection.
If T2＞60℃, the compressor will stop and not resume until T2＜48℃.
9.7.6 Defrosting mode.
1) Condition of defrosting.
Condition 1: If T4＞0℃,
When the units are running, if any one the following two items are satisfied the units start defrosting:
a) The units runs with T3＜3℃ for 40 minutes and T3 keeps lower than -6℃ for more than 3
minutes.
b) The units runs with T3＜3℃ for 80 minutes and T3 keeps lower than -4℃ for more than 3
minutes.
Condition 2: If T4＜0℃,
The program judges according to the condition 1, if any one of the two items are satisfied, then judges if T2 has
descended for more than 5℃, if it has the machine starts defrosting, or continues to judge T2 and will not defrost until
T2 drops more than 5℃.
Condition 3: No matter what value T4 is, if the machine runs with T3＜3℃ for more than 120 minutes and T3
keeps lower than -2℃ for more than 3 minutes, the machine will defrost, no matter if T2 drops for more than 5℃
or not.
2) Condition of ending defrosting.
If any one of following items is satisfied, defrosting will finish and the machine will turn to normal heating
mode.
a) T3 rises to be higher than 12℃.
b) T3 rises to be higher than 8℃ and remains for 80 seconds.
c) The machine has run for 10 minutes in defrosting.
29
9.7.7 Defrosting action.
compressor
F8
on
off
4-way valve
outdoor fan
indoor fan
indoor fan breeze 10s
on
off
on
off
on
off
60s
70s
no longer than 10 minutes 30s
9.7.8 Rating capacity test function.
1) Set the indoor unit with remote controller as: high fan, 30℃ in heating mode, then press “TURBO” button
on controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine
will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds continuously. Also,
indoor fan will change to rating speed, the frequency of compressor will be fixed as rating value. Any
condition of above is not satisfied, the machine can not be turned into rating capacity test mode.
2) The machine will quit from the rating capacity test mode if running for 5 hours or changing fan speed or
setting temperature.
9.7.9 Turbo function in heating mode. (press the “TURBO” button on remote controller)
1) Elevate current frequency(excluding F8) to a higher grade. If indoor fan is in low speed or pause caused by
defrosting or anti-cold-wind function, frequency of compressor will not be elevated one grade until these
limit has been released.
2) Indoor fan changes to turbo speed and anti-cold-wind function is valid.
3) After running for 30 minutes the machine will turn back to previous setting mode.
9.8 Auto mode function
9.8.1 This mode can be chosen with remote controller and the setting temperature can be changed between 17~30℃.
In auto mode, the machine will choose cooling, heating or fan-only mode according to ∆T(∆T =T1-Ts).
∆T=T1-Ts Running mode
∆T＞1℃ Cooling
-1≤∆T≤1℃ Heating
∆T＜-1℃ Fan-only
9.8.2 Indoor fan will choose auto speed of relevant mode.
9.8.3 If the machine switches mode between heating and cooling, compressor will keep stopping for 15 minutes and
then rechoose mode according to ∆T.
9.8.4 If the setting temperature is modified, the machine will rechoose running function.
30
9.9 Forced operation function
9.9.1 Forced cooling and auto function can carry out with a touch button. In these two modes, the machine can be
changed by remote controller to any other mode at any moment.
9.9.2 When the machine is off, pressing the touch button will carry the machine to forced auto mode, after this, if
pressing the button once again within 5 seconds, the machine will turn into forced cooling mode. In forced auto,
forced cooling or any other operation mode, pressing touch button will turn off the machine. In forced operaton,
remote control is available.
9.9.3 In forced operation mode, all general protections is available.
9.9.5 In forced cooling mode, after running for 30 minutes. the machine will turn to normal auto mode which setting
temperature is 24℃.
9.9.6 The action of forced auto mode is the same as normal auto mode which temperature is 24℃.
9.10 Action of 4-way valve
In heating, fan-only, standby or turning off mode, 4-way valve is off, while in cooling or drying mode 4-way valve is
on. If the machine changes operation mode from cooling or drying mode to some other mode, 4-way valve will be
delayed off 2 minutes after compressor stop. For defrosting, please refer to the passage “defrosting mode”.
9.11 Two speeds outdoor fan function
9.11.1 Outdoor fan starts at the same time with compressor, but stops 30 seconds later after compressor stop.
9.11.2 Outdoor fan action in heating mode(including heating in auto mode).
℃
17
15
outdoor temperature
Outdoor fan action in heating mode
(including heating in auto mode).
low
high
outdoor fan speed
℃
22
20
outdoor temperature
Outdoor fan action in cooling & drying mode
(including cooling in auto & forced mode).
high
low
outdoor fan speed
9.11.3 Outdoor fan action in cooling & drying mode(including cooling in auto & forced mode).
Please refer to the pic. above.
9.12 Timer function
9.12.1 Timing range is 24 hours, and the minimum resolution is 15 minutes.
9.12.2 Timer on. After turning off, the machine will turn on automatically when reaching the setting time.
9.12.3 Timer off. After turning on, the machine will turn off automatically when reaching the setting time.
9.12.4 Timer on/off. After turning off, the machine will turn on automatically when reaching the setting “on” time, and
then turn off automatically when reaching the setting “off” time.
9.12.5 Timer off/on. After turning on, the machine will turn off automatically when reaching the setting “off” time, and
then turn on automatically when reaching the setting “on” time.
9.12.6 The tolerance of timer is 1 minute per hour.
9.13 Sleep function mode
9.13.1 Operation time in sleep mode is 7 hours. After 7 hours the machine quits this mode and turns off.
9.13.2 In cooling, heating or auto mode sleep function is available.
31
9.13.3 Operation process in sleep mode is as follow:
1) After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode.
2) When cooling, the setting temperature rises 1℃(be lower than 30℃) every one hour, 2 hour later the rising
stops and indoor fan is fixed as low speed.
3) When heating, the setting temperature descends 1℃(be lower than 30℃) every one hour, 2 hour later the
descending stops and indoor fan is fixed as low speed, and anti-cold-wind is available.
9.13.4 If user uses timer on function in sleep mode, sleep function will pause and not resume until reaches the setting
on time.
9.13.5 When user uses timer off function in sleep mode(or sleep function in timer off mode), if the timing time is less
than 7 hours, sleep function will be cancelled when reaching the setting time. If the timing time is more than 7
hours, the machine will not stop until reaches the setting off time in sleep mode.
9.14 Auto-Restart function
The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart module. In case
of a sudden power failure, the module restores the setting conditions before the power failure. The unit will resume
the previous operation setting (not including Swing function) automatically after 3 minutes when power returns.
9.15 Ionizer/Plasma dust collector function(optional)
The indoor unit is equipped with Ionizer, which is controlled by the CLEAN AIR button on the remote controller
when the unit is turned on. Press the CLEAN AIR button to activate the function. Press it again to stop the function.
During the time when Ionizer being controlled by remote controller, Ionizer will be turned off automatically, if indoor
fan stops running due to malfunctions or anti-cold-wind. When indoor fan restarts after malfunctions being
eliminated and anti-cold-wind being released, Ionizer will be available again.
Note: Ionizer and Plasma dust collector share a drive port on the chip, and action rule is the same.
9.16 Outdoor chassis heating cable (optional)
Heating cable is fixed on outdoor chassis to help deicing and to avoid freezing. The heating cable’s power is 85W,
rated voltage is 220v-240v, and is controlled by a thermostat. If outdoor temperature (sensed by outdoor
thermostat) is lower than 5℃,the thermostat closes and the heating cable begins to work. If outdoor temperature
higher than 15℃ ,the thermostat opens and the heating cable stops working.
32
10. Troubleshooting
Safety
Because of there are capacitors in PCB and relative circuit in outdoor unit, even shut down the power supply,
electricity power still are kept in capacitors, do not forget to discharge the electricity power in capacitor.
Electrolytic Capacitors
(HIGH VOLTAGE! CAUTION!)
Bulb (25-40W)
33
10.1 Indoor Unit Error Display
Display LED STATUS
E0 EEPROM parameter error
E1 Indoor / outdoor units communication protection
E2 Zero-crossing signal error
E3 Fan speed out of control
E5 Open or short circuit of outdoor temperature sensor
E6 Open or short circuit of room or evaporator temperature sensor
P0 IGBT over-strong current protection
P1 Over voltage or too low voltage protection
P2 Temperature protection of compressor top.
P4 Inverter compressor drive error
Note: E4 & P3: Reserved function
10.2 Outdoor Unit Error Display
Outdoor display function
Operation state lamp LED1 (yellow) is controlled by outdoor main chip. After power is on, it blinks at a frequency
of 0.2Hz when the unit is in standby mode. It illuminates when the unit is in operation. It blinks at a frequency of
2.5Hz when the unit has any malfunctions.
Power supply lamp LED4 (red) is controlled by outdoor +5v power source. It illuminates after power is on.
LED5 (red) and LED6 (green) are controlled by compressor drive chip, display codes are as following:
malfunction LED6 (green) LED5 (red) Indoor display
Over voltage or too low voltage protection
Normal standby O ×
MCE malfunction
Normal operation O O
MCE start malfunction
MCE phase lack protection, MCE zero
speed protection, PWM in-phase
malfunction
IGBT over-strong current
Communication malfunction
Remarks: (1) ○—Bright ×—Extinguished ☆—Blink
(2) blink at a frequency of 2.5Hz
(3) malfunction codes display time according to the actual protection time
O O P1
O ☆ P1
× ☆ P4
☆ O P4
☆ × P0
☆ ☆ P4
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LED1
LED4
LED5
LED6
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10.3 Diagnosis and Solution
10.3.1 E0(EEPROM parameter error) error diagnosis and solution
Circuit or software error on indoor PCB
10.3.2 E1(indoor / outdoor units communication protection) error diagnosis and solution
Disconnect the power supply, after 1 minute,
connect the power supply, turn on the unit with
remote controller
Does the unit work normally?
NO
Check the wiring between
indoor and outdoor unit. Is
the connection of L, N, S and
GND good?
Is the GND connection on
outdoor PCB good?
Is the LED4(red) on
outdoor PCB bright and
LED1(yellow) blinking?
Replace indoor PCB
Reconnect and retest again
Replace indoor PCB
and repower on. Is
the failure cleared?
The power supply for
outdoor PCB is fail. Check
the wiring on outdoor PCB
comparing with wiring plate.
Is the connection good?
Correct the connection.
10.3.3 E2(zero-crossing signal error) diagnosis and solution
Is power supply and
connection of connectors
good?
YES
NO
Replace outdoor e-box.
Be sure the power supply is good
and correct the connection
Indoor PCB is defective. Replace
the indoor PCB.
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10.3.4 E3(indoor fan speed out of control) diagnosis and solution
Is the indoor fan motor
connector and connection
good?
YES
Is voltage being applied to
the fan motor?
(rang 90v-160v between
mid pin and N on CN1
NO
NO
YES
10.3.5 E5(Open or short circuit of outdoor temperature sensor) diagnosis and solution.
Is the outdoor temperature
sensor connector and
connection good?
YES
Replace the sensor and
check if E5 display again?
NO
YES
Repair the connector and
reconnect
Replace outdoor e-box
Repair the connector and
reconnect
Indoor PCB is defective.
Replace the indoor PCB.
Replace the indoor fan
motor
10.3.6 E6(open or short circuit of room or evaporator temperature sensor) diagnosis and solution.
Is the indoor temperature
and evaporator sensor
connector and connection
good?
YES
Replace the sensor and
check if E6 display again?
NO
YES
Repair the connector and
reconnect
Replace the.indoor PCB
10.3.7 P0(IGBT over-strong current protection) diagnosis and solution.
Is all connections on PCB
and between PCB and
compressor good?
YES
NO
Repair or correct the
connector or connection.
Replace the outdoor PCB
and then repower on. Is
the failure cleared?
NO
Check the compressor
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operate?
10.3.8 P1(over voltage or too low voltage protection) diagnosis and solution.
Is the power supply good?
YES
NO
10.3.9 P2(temperature protection of compressor top) diagnosis and solution.
Does compressor
YES
Is refrigerant
circulation
volume normal?
NO
Charge refrigerant
NO
Is the connection
good?
YES
Is protector
normal?
YES
Check the outdoor
main PCB. Is there
some problem?
Be sure the power supply is
normal when using the units
Replace the outdoor e-box.
NO
Reconnect and retest.
NO
Replace the protector.
YES
Is abnormality
the same after
gas charging?
NO
10.3.10 P4(inverter compressor drive error) diagnosis and solution.
Is the connection of
compressor good? Is the
wiring sequence right? The
YES
Replace the outdoor E-box.
NO
Replace the outdoor PCB.
Check refrigerant system (such
as clogging of capillary, etc)
Reconnect and retry
If the problem comes to
again, check coil resistance
of inverter compressor, is it
NO
Replace inverter compressor
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10.4 Key parts checking.
10.4.1. Compressor checking (Model: DA108X1C-20FZ3).
Measure the resistance value of each winding by using the multi-meter.
Position Resistance Value
Blue - Red
Blue - Black
Red - Blue
10.4.2 Outdoor Fan Motor (Model: YDK24-6G).
Measure the resistance value of each winding by using the multi-meter.
Position Resistance Value
Black - Red
Blue - Red 213Ω (20℃)
Yellow - Blue 138Ω (20℃)
0.71Ω
(20℃)
435Ω (20℃)
10.4.3 Indoor Fan Motor (Model: RPG20D).
Measure the resistance value of each winding by using the multi-meter.
Position Resistance Value
Black - Red
White - Black 290Ω±8% (20℃)
10.4.4 Step Motor (Model: MP2835).
Measure the resistance value of each winding by using the multi-meter.
Position Resistance Value
Blue - Red
Pink - Orange
Pink - Yellow
415Ω±8% (20℃)
200Ω±7% (25℃)
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Yellow - Red
10.4.5 Temperature Sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor exhaust temp.(Te) sensor.
Measure the resistance value of each winding by using the multi-meter.
Some frequently-used R-T data for T1,T2,T3 and T4 sensor:
Temperature ( ) ℃ 5 10 15 20 25 30 40 50 60
Resistance Value (KΩ) 26.9 20.7 16.1 12.6 10 8 5.2 3.5 2.4
Some frequently-used R-T data for Te sensor:
Temperature (℃) 5 15 25 35 60 70 80 90 100
Resistance Value (KΩ) 141.6 88 56.1 36.6 13.8 9.7 6.9 5 3.7
KΩ
℃
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UPDATE EXPLANATION：：：：
V1.1
29th, Jan., 2007 Revised by Alex Jiang & Jim Xu
1. Correct some spelling and editing mistake.
2. Add the passage 9.14-9.16.
3. Add the passage 10.2 (Outdoor Unit Error Display).
V1.2
2th, Apr., 2007 Revised by Alex Jiang
1. Update the refrigerant circuit chart.
2. Revise the electronic function explanations and make that more understandable.
3. Add the discharging caution of the big electrolytic capacitors.
4. Add the passage 10.4(Key parts checking) and delete temp. characteristic chart of sensors.
5. Update the indoor unit wiring diagram.
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