Midea MSY-09HRDN1-QC8, MSY-12HRDN1-QC4, MSY-09HRDN1-QC2, MSY-12HRDN1-QC2, MSY-18HRDN1-QC2 Service Manual
Website: www.mideaaircon.com
Service Manual
AIR CONDITIONER
DC Inverter
Split Wall-Mounted Type
Model Refrigerant type Power supply
MSY-09HRDN1-QC8 R410A 1Ph, 220~240V, 50Hz
MSY-12HRDN1-QC4 R410A 1Ph, 220~240V, 50Hz
MSY-09HRDN1-QC2 R410A 1Ph, 220~240V, 50Hz
MSY-12HRDN1-QC2 R410A 1Ph, 220~240V, 50Hz
-18HRDN1-QC2 R410A 1Ph, 220~240V, 50Hz
Y series
CONTENTS
1. Precaution...........................................................................................................................................1
1.1 Safety Precaution..............................................................................................................................1
1.2 Warning................................................................................................................................................1
2. Function...............................................................................................................................................3
3. Dimension...........................................................................................................................................6
3.1 Indoor Unit...........................................................................................................................................6
3.2 Outdoor Unit.......................................................................................................................................7
4. Specification.......................................................................................................................................9
5. Refrigerant cycle diagram...............................................................................................................10
6. Wiring diagram.................................................................................................................................13
6.1 Indoor Unit.........................................................................................................................................13
6.2 Outdoor Unit.....................................................................................................................................13
7. Installation details.............................................................................................................................15
7.1 Wrench torque sheet for installation............................................................................................16
7.2 Connecting the cables..................................................................................................................16
7.3 Pipe length and the elevation......................................................................................................16
7.4 Air purging of the piping and indoor unit...................................................................................16
7.5 Pumping down (Re-installation)....................................................................................................18
7.6 Re-air purging (Re-installation)......................................................................................................19
7.7 Balance refrigerant of the 2-way, 3-way valves........................................................................20
7.8 Evacuation........................................................................................................................................21
7.9 Gas charging....................................................................................................................................22
8. Electronic function............................................................................................................................23
8.1 Abbreviation.....................................................................................................................................23
8.2 Display function................................................................................................................................23
8.3 Protection..........................................................................................................................................24
8.4 Fan-Only Mode................................................................................................................................24
8.5 Cooling Mode..................................................................................................................................25
8.6 Drying mode.....................................................................................................................................26
8.7 Heating mode..................................................................................................................................26
8.8 Auto mode function........................................................................................................................30
8.9 Forced operation function.............................................................................................................30
8.10 Action of 4-way valve...................................................................................................................30
8.11 Two speeds outdoor fan function..............................................................................................31
8.12 Timer function.................................................................................................................................31
8.13 Sleep function mode....................................................................................................................31
8.14 Auto-Restart function....................................................................................................................32
8.15 Super ionizer function....................................................................................................................29
8.16 Self clean function.........................................................................................................................29
8.17 Follow me
function………………………………………………………………………………………………………………
……………….30
8.18 Outdoor heating cable
function…………………………………………………………………………………………………………….30
9. Troubleshooting................................................................................................................................33
9.1 Indoor Unit Error Display..................................................................................................................35
9.2 Diagnosis and Solution....................................................................................................................36
9.3 Key parts checking..........................................................................................................................40
1
1. Precaution
1.1 Safety Precaution
n To prevent injury to the user or other
people and property damage, the following
instructions must be followed.
n Incorrect operation due to ignoring
instruction will cause harm or damage.
n Before service unit, be sure to read this
service manual at first.
1.2 Warning
Ø Installation
n Do not use a defective or underrated
circuit breaker. Use this appliance on a
dedicated circuit.
There is risk of fire or electric shock.
n For electrical work, contact the dealer,
seller, a qualified electrician, or an Authorized
service center.
Do not disassemble or repair the product,
there is risk of fire or electric shock.
n Always ground the product.
There is risk of fire or electric shock.
n Install the panel and the cover of
control box securely.
There is risk of fire of electric shock.
n Always install a dedicated circuit and
breaker.
Improper wiring or installation may cause
fore or electric shock.
n Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
n Do not modify or extend the power
cable.
There is risk of fire or electric shock.
n Do not install, remove, or reinstall the
unit by yourself (customer).
There is risk of fire, electric shock, explosion,
or injury.
n Be caution when unpacking and
installing the product.
Sharp edges could cause injury, be
especially careful of the case edges and the
fins on the condenser and evaporator.
n For installation, always contact the
dealer or an Authorized service center.
There is risk of fire, electric shock, explosion,
or injury.
n Do not install the product on a
defective installation stand.
It may cause injury, accident, or damage to
the product.
n Be sure the installation area does not
deteriorate with age.
If the base collapses, the air conditioner
could fall with it, causing property damage,
product failure, and personal injury.
n Do not let the air conditioner run for a
long time when the humidity is very high and
a door or a window is left open.
Moisture may condense and wet or
damage furniture.
n Take care to ensure that power cable
could not be pulled out or damaged during
operation.
There is risk of fire or electric shock.
n Do not place anything on the power
cable.
There is risk of fire or electric shock.
n Do not plug or unplug the power
supply plug during operation.
There is risk of fire or electric shock.
n Do not touch (operation) the product
with wet hands.
There is risk of fire or electric shock.
n Do not place a heater or other
appliance near the power cable.
There is risk of fire and electric shock.
n Do not allow water to run into electric
parts.
It may cause fire, failure of the product, or
electric shock.
n Do not store or use flammable gas or
combustible near the product.
There is risk of fire or failure of product.
n Do not use the product in a tightly
closed space for a long time.
Oxygen deficiency could occur.
n When flammable gas leaks, turn off the
gas and open a window for ventilation before
turn the product on.
Do not use the telephone or turn switches
on or off.
There is risk of explosion or fire.
n If strange sounds, or small or smoke
comes from product. Turn the breaker off or
2
disconnect the power supply cable.
There is risk of electric shock or fire.
n Stop operation and close the window
in storm or hurricane. If possible, remove the
product from the window before the hurricane
arrives.
There is risk of property damage, failure of
product, or electric shock.
n Do not open the inlet grill of the
product during operation. (Do not touch the
electrostatic filter, if the unit is so equipped.)
There is risk of physical injury, electric shock,
or product failure.
n When the product is soaked (flooded
or submerged), contact an Authorized
service center.
There is risk of fire or electric shock.
n Be caution that water could not enter
the product.
There is risk of fire, electric shock, or product
damage.
n Ventilate the product from time to time
when operating it together with a stove, etc.
There is risk of fire or electric shock.
n Turn the main power off when cleaning
or maintaining the product.
There is risk of electric shock.
n When the product is not be used for a
long time, disconnect the power supply plug
or turn off the breaker.
There is risk of product damage or failure, or
unintended operation.
n Take care to ensure that nobody could
step on or fall onto the outdoor unit.
This could result in personal injury and
product damage.
Ø CAUTION
n Always check for gas (refrigerant)
leakage after installation or repair of product.
Low refrigerant levels may cause failure of
product.
n Install the drain hose to ensure that
water is drained away properly.
A bad connection may cause water
leakage.
n Keep level even when installing the
product.
To avoid vibration or water leakage.
n Do not install the product where the
noise or hot air from the outdoor unit could
damage the neighborhoods.
It may cause a problem for your neighbors.
n Use two or more people to lift and
transport the product.
Avoid personal injury.
n Do not install the product where it will
be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product.
Corrosion, particularly on the condenser and
evaporator fins, could cause product
malfunction or inefficient operation.
Ø Operational
n Do not expose the skin directly to cool
air for long periods of time. (Do not sit in the
draft).
This could harm to your health.
n Do not use the product for special
purposes, such as preserving foods, works of
art, etc. It is a consumer air conditioner, not a
precision refrigerant system.
There is risk of damage or loss of property.
n Do not block the inlet or outlet of air
flow.
It may cause product failure.
n Use a soft cloth to clean. Do not use
harsh detergents, solvents, etc.
There is risk of fire, electric shock, or
damage to the plastic parts of the product.
n Do not touch the metal parts of the
product when removing the air filter. They are
very sharp.
There is risk of personal injury.
n Do not step on pr put anything on the
product. (outdoor units)
There is risk of personal injury and failure of
product.
n Always insert the filter securely. Clean
the filter every two weeks or more often if
necessary.
A dirty filter reduces the efficiency of the air
conditioner and could cause product
malfunction or damage.
n Do not insert hands or other object
through air inlet or outlet while the product is
operated.
There are sharp and moving parts that
could cause personal injury.
n Do not drink the water drained from the
3
product.
It is not sanitary could cause serious health
issues.
n Use a firm stool or ladder when
cleaning or maintaining the product.
Be careful and avoid personal injury.
n Replace the all batteries in the remote
control with new ones of the same type. Do
not mix old and mew batteries or different
types of batteries.
There is risk of fire or explosion.
n Do not recharge or disassemble the
batteries. Do not dispose of batteries in a fire.
They may burn of explode.
n If the liquid from the batteries gets onto
your skin or clothes, wash it well with clean
water. Do not use the remote of the batteries
have leaked.
The chemical in batteries could cause
burns or other health hazards
4
2. Function
When the power supply is
interrupted and then restore, the
air conditioners automatically
restore the previous function
Maintain the room temperature in
accordance with the setting temperature.
The mode can be change by the room
The louver can be set at the desired
position or swing up and down
The function is usually used in rainy
days in springtime or damp areas.
The fan is turn to low speed
(cooling/heating).
The unit will decide the louver direction
according to
Turbo, high, med, low, breeze.
Restarting is for approx. 3
Prevent the water being fr
ozen
on evaporator by
sensing the evaporator pipe temperature in
Room temperature
sensor.
Indoor unit
Operation by remote
Sensing by room
Room temperature
Anti-freezing control in
Time Delay Safety
Indoor fan speed control
Two-direction air vane
Sleep mode auto control
Independent
Air flow Direction control
Auto mode
Temp. Compensation
Flexible wiring
Auto defrost
Anti-cold function
Self-diag. function
Auto-restart function
Super Ionizer
Prevent the cold wind
at
the beginning of unit start.
Follow
Self clean
Compact
Golden fin
5
It protects the valves and prevents water from
The unit has 3 mins delay between continuously ON/OFF
Outdoor unit
Power relay control
The hydrophilic fin can improve the heating efficiency at
Hydrophilic aluminum fin
It is only operated in the heating operation mode except defrosting
Anti-rust cabinet
Valve protection cover
4 way valve control
Made from electrolytic zinc steel sheet and anti
-
rust coated
Low noise air flow system
Bird tail propeller fan makes the outdoor unit run more
quietly.
Discharge pipe temperature
Heating cable
Driving heating at -15
6
3. Dimension
3.1 Indoor Unit
Dimension
Model
W H D
MSY-09HRDN1-QC2 850 275 160
MSY-09HRDN1-QC8
MSY-12HRDN1-QC2
MSY-12HRDN1-QC4
MSY-18HRDN1-QC2 1022 295 185
900 285 160
7
3.2 Outdoor Unit
MOA-09HDN1-QC2
MOB4-12HDN1-QC2
8
MOC-09HDN1-QC8, MOC-12HDN1-QC4, MOC-18HDN1-QC2
9
4. Specification
Model MSY-09HRDN1-QC8 MSY-12HRDN1-QC4
Indoor MSY-09HRDN1-QC8 MSY-12HRDN1-QC4
Outdoor MOC-09HDN1-QC8 MOC-12HDN1-QC4
Power supply Ph-V-Hz
1,220-240V~,50Hz 1,220-240V~,50Hz
Capacity
Btu/h 9000(3100~11500) 12000(3800~14800)
Input W 690(280~1100) 1030(360~1480)
Rated current A 3.1(1.3~4.8) 4.6(1.6~6.5)
Cooling
EER W/W 3.82 3.41
Capacity Btu/h 10000(3300~12500) 13000(4000~15500)
Input W 690(300~1150) 1000(340~1450)
Rated current A 3.1(1.4~5.0) 4.5(1.7~6.4)
Heating
COP W/W 4.25 3.81
Max. input consumption W 1750 1950
Max. current A 8.0 9.0
Starting current A 5.0 7.0
Model DA108X1C-20FZ3 DA108X1C-20FZ3
Type Rotary Rotary
Brand TOSHIBA TOSHIBA
Capacity Btu/h 10918 10918
Input W 855 855
Thermal protector
CS-74 CS-74
Capacitor uF No No
Compressor
Refrigerant oil ml 480 480
Model RPG20D RPG20D
Brand Welling Welling
Input W 43 43
Capacitor uF 1.5 1.5
Indoor fan
motor
Speed r/min 1290/1250/1000/900/700 1290/1250/1000/900/700
Indoor air flow (Hi/Mi/Lo) m3/h 600/500/400 600/500/400
Indoor noise level (Hi/Mi/Lo) dB(A) 38/34/28 38/34/28
Dimension (W*H*D) mm 900×285×160 900×285×160
Packing (W*H*D) mm 990× 375×250 990×375×250
Indoor unit
Net/Gross weight Kg 9.0/11.5 9.0/11.5
Model YDK24-6G YDK24-6G
Brand Welling Welling
Input W 59 59
Capacitor uF 2.5 2.5
Outdoor fan
motor
Speed r/min 800/550 800/550
Outdoor air flow m3/h 2000 2000
Outdoor noise level dB(A) 54 54
Dimension(W*H*D) mm 760× 590×285 760×590×285 Outdoor unit
Packing (W*H*D) mm 887×655×355 887×655×355
10
Net/Gross weight Kg 40.5/43 40.5/43
Refrigerant type R410A g 1100 1100
Design pressure MPa 4.2 4.2
Liquid side/ Gas side mm Ф6.35/Ф9.53 Ф6.35/Ф 12.7
Max. refrigerant pipe
length m
20 20
Refrigerant
piping
Max. difference in level
m 8 8
Connection wiring No No
Plug type 16A 16A
Thermostat type Electronic control Electronic control
Operation temp
℃
17 ~ 30 17 ~ 30
Ambient temp
℃
-15 ~ 50 -15 ~ 50
Application area m2 16-24 28 ~ 40
Qty’per 20’ /40’ /40'HQ
Set
92/184/225 92/184/225
Model MSY-09HRDN1-QC2 MSY-12HRDN1-QC2 MSY-18HRDN1-QC2
Indoor MSY-09HRDN1-QC2 MSY-12HRDN1-QC2 MSY-18HRDN1-QC2
Outdoor MOA-09HDN1-QC2 MOB4-12HDN1-QC2 MOC-18HDN1-QC2
Power supply Ph-V-Hz
1,220-240V~,50Hz 1,220-240V~,50Hz 1,220-240V~,50Hz
Capacity
Btu/h 9000(3300~11200) 12000(4100~13800) 17000(6000~20000)
Input W 810(240~1200) 1080(360~1400) 1550(530~2040)
Rated current A 3.6(1.2~5.3) 4.9(1.8~6.5) 6.8(2.4~9.2)
Cooling
EER W/W 3.26 3.26 3.22
Capacity Btu/h 10000(4000~13000) 13000(4200~14500) 18000(6400~22000)
Input W 810(240~1250) 1050(350~1420) 1460(480~2000)
Rated current A 3.6(1.2~5.6) 4.6(1.7~6.6) 6.5(2.3~9.0)
Heating
COP W/W 3.62 3.63 3.61
Max. input consumption W 1750 1950 2950
Max. current A 8.0 9.0 13.5
Starting current A 5.5 7.5 10
Model DA89X1C-23EZD1 DA89X1C-23FZ 5RS132ZAD21
Type Rotary Rotary Rotary
Brand TOSHIBA TOSHIBA Panasonic
Capacity Btu/h 8803 9040 3385
Input W 685 680 1250
Thermal protector
CS-74 CS-74 1NT11L-5270 L115-15
Capacitor uF No No No
Compressor
Refrigerant oil ml 370 370 370
Indoor fan Model RPG13G RPG20D RPG28D
11
Brand Welling Welling Welling
Input W 34 43 51
Capacitor uF 1.2 1.5 1.5
motor
Speed r/min 1250/1200/1050/850/700 1280/1250/1050/900/750
1280/1260/1080/900/750
Indoor air flow (Hi/Mi/Lo) m3/h 480/420/320 600/500/400 870/730/520
Indoor noise level (Hi/Mi/Lo) dB(A) 37/33/27 38/34/28 42/37/32
Dimension (W*H*D) mm 850×275×160 900×285× 160 1022×295×185
Packing (W*H*D) mm 940× 360×250 990×375×250 1105×385×275
Indoor unit
Net/Gross weight Kg 8.5/11 9/11.5 12/15.5
Model YDK24-6K YDK24-6G YDK50-6C
Brand Welling Welling Welling
Input W 63/49 59/47 111/96
Capacitor uF 2.5 2.5 2.5
Outdoor fan
motor
Speed r/min 815/590 800/550 890/540
Outdoor air flow m3/h 1800 2000 2200
Outdoor noise level dB(A) 53 54 56
Dimension(W*H*D) mm 700× 535×235 780×540×250 760×590×285
Packing (W*H*D) mm 815×580×325 910×575×335 887×655×355
Outdoor unit
Net/Gross weight Kg 28/30 39.5/42 40/42.5
Refrigerant type R410A g 700 1050 1100
Design pressure MPa 4.2 4.2 4.2
Liquid side/ Gas side mm Ф6.35/Ф9.53 Ф6.35/Ф 12.7 Ф6.35/Ф12.7
Max. refrigerant pipe
length m
20 20 25
Refrigerant
piping
Max. difference in level
m 8 8 10
Connection wiring No No No
Plug type 16A 16A No plug
Thermostat type Electronic control Electronic control Electronic control
Operation temp
℃
17 ~ 30 17 ~ 30 17 ~ 30
Ambient temp
℃
-15 ~ 50 -15 ~ 50 -15 ~ 50
Application area m2 16-24 20-30 28 ~ 40
Qty’per 20’ /40’ /40'HQ
Set
130/270/300
110/230/265
90/195/220
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