Midea MS9A-09HRDN1-QC2, MS9A-12HRDN1-QC2 Service Manual
SERVICE MANUAL
MIDEA AIRCONDITIONER
DC INVERTER
SPLIT WALL-MOUNTED TYPE
MS9A-09HRDN1-QC2
MS9A-12HRDN1-QC2
V1.0
Oct, 2009
CONTENTS
1. Precaution................................................................................................................................................. 1
1.1 Safety Precaution ................................................................................................................................................ 1
1.2 Warning ...............................................................................................................................................................1
2. Function.................................................................................................................................................... 4
3. Dimension................................................................................................................................................. 6
3.1 Indoor Unit........................................................................................................................................................... 6
3.2 Outdoor Unit ........................................................................................................................................................ 7
4. Specification............................................................................................................................................. 9
5. Refrigerant cycle diagram....................................................................................................................... 9
6. Wiring diagram....................................................................................................................................... 10
6.1 Indoor Unit......................................................................................................................................................... 10
6.2 Outdoor Unit ...................................................................................................................................................... 10
7. Installation details...................................................................................................................................11
7.1 Wrench torque sheet for installation .................................................................................................................. 12
7.2 Connecting the cables ....................................................................................................................................... 12
7.3 Pipe length and the elevation ............................................................................................................................12
7.4 Air purging of the piping and indoor unit ............................................................................................................ 12
7.5 Pumping down (Re-installation)......................................................................................................................... 14
7.6 Re-air purging (Re-installation).......................................................................................................................... 15
7.7 Balance refrigerant of the 2-way, 3-way valves ................................................................................................. 16
7.8 Evacuation......................................................................................................................................................... 20
7.9 Gas charging .....................................................................................................................................................21
8. Operation characteristics...................................................................................................................... 19
8.1 MS9A-09HRDN1-QC2....................................................................................................................................... 19
8.2 MS9A-12HRDN1-QC2....................................................................................................................................... 20
9. Electronic function ................................................................................................................................ 21
9.1 Abbreviation ...................................................................................................................................................... 21
9.2 Display function ................................................................................................................................................. 21
9.3 Protection .......................................................................................................................................................... 22
9.4 Fan-Only Mode.................................................................................................................................................. 22
9.5 Cooling Mode ....................................................................................................................................................23
9.6 Drying mode ...................................................................................................................................................... 24
9.7 Heating mode .................................................................................................................................................... 24
9.8 Auto mode function............................................................................................................................................ 27
9.9 Forced operation function.................................................................................................................................. 28
9.10 Action of 4-way valve....................................................................................................................................... 28
9.11 Two speeds outdoor fan function..................................................................................................................... 28
9.12 Timer function.................................................................................................................................................. 29
9.13 Sleep function mode........................................................................................................................................ 29
9.14 Auto-Restart function....................................................................................................................................... 29
9.15 Ionizer/Plasma dust collector function(optional) ..............................................................................................29
9.16 Outdoor chassis heating cable (optional) ........................................................................................................ 29
10. Troubleshooting................................................................................................................................... 30
10.1 Indoor Unit Error Display ................................................................................................................................. 31
10.2 Diagnosis and Solution.................................................................................................................................... 32
10.3 Key parts checking. ......................................................................................................................................... 40
1
1. Precaution
1.1 Safety Precaution
To prevent injury to the use r or othe r pe o ple
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 window 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 p ower 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 th e gas
and open a window for ventilation before t urn 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
2
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.
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 directl y 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
3
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 setting.
Maintain the room temperature in accordance with the
setting temperature.
The mode can be change by the room temperature.
The louver can be set at the desired position or
swing up and down automatically
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 be turn off at the seventh hour.
The unit will decide the louver direction according to
operation mode.
Turbo, high, med, low, breeze.
Restarting is for approx. 3 minutes..
Prevent the water being frozen on evaporator by sensing
the evaporator pipe temperature in cooling mode
Room temperature sensor.
Pipe temperature sensor.
Indoor unit
Operation by remote controller
Sensing by room temperature
Room temperature control
Anti-freezing control in cooling
Time Delay Safety control
Indoor fan speed control
Two-direction air vane
Sleep mode auto control
Independent dehumidification
Air flow Direction control
Auto mode
Temp. Compensation
Flexible wiring connection
Auto defrost
Plasma (Optional)
Anti-cold function
Self-diag. function
Auto-restart function
Timer function
Ionizer (Optional)
Prevent the cold wind at the
beginning of unit start.
5
It protects the valves and prevents water from dripping.
The unit has 3 mins delay between continuously ON/OFF operations.
Outdoor unit
Power relay control
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.
Anti-rust cabinet
Valve protection cover
4 way valve control
Made from electrolytic zinc steel sheet and anti-rust coated components.
Low noise air flow system
Bird tail propeller fan makes the outdoor unit run more quietly.
Discharge pipe temperature protect
Chassis heating belt (Optional)
Driving heating at -15
6
3. Dimension
3.1 Indoor Unit
Model W(mm) H(mm) D(mm)
MS9A-09HRDN1-QC2 710 250 190
MS9A-12HRDN1-QC2 790 265 198
7
3.2 Outdoor Unit
MOR-09/12HDN1-QC2
8
4. Specification
Indoor MS9A-09HRDN1-QC2 MS9A-12HRDN1-QC2
Outdoor MOR-09HDN1-QC2 MOR-12HDN1-QC2
Power supply Ph-V-Hz 1,220-240V~,50Hz 1, 220-240V~, 50Hz
Moisture Removal L/h 1.0 1.2
Max. input consumption W 1650 1850
Max. current A 7.5 8.5
Model DA89X1C-20EZ DA89X1C-20EZ
Type Rotary Rotary
Brand TOSHIBA TOSHIBA
Capacity W 2605 2605
Input W 680 680
Rated current(RLA) A 4.6 4.6
Thermal protector INT01L-4639 INT01L-4639
Compressor
Refrigerant oil ml 370 370
Model RPG20D RPG20D
Brand Welling Welling
Input W 43 43
Capacitor uF 1.5 1.5
Indoor fan motor
Speed(hi/mi/lo) r/min 1150/950/800 1150/1000/850
Indoor air flow (Hi/Mi/Lo) m3/h 580/480/350 620/490/380
Indoor noise level (Hi/Mi/Lo) dB(A) 39/33/28 40/35/29
Dimension (W*H*D) mm 710*250*190 790*265*198
Packing (W*H*D) mm 770*318*265 875*335*265
Indoor unit
Net/Gross weight Kg 7.5
/
9.5 9.0/11.0
Model YDK24-6P YDK24-6P
Brand Welling Welling
Input W 55/43 55/43
Capacitor uF 2.5 2.5
Outdoor fan motor
Speed r/min 860
/
660 860/660
Outdoor air flow m3/h 1800 1800
Outdoor noise level dB(A) 52 52
Dimension(W*H*D) mm 659*531*257 659*531*257
Packing (W*H*D) mm 770*585*325 770*585*325
Outdoor unit
Net/Gross weight Kg 27.5
/
29.5 29/31
Refrigerant type R410A g 660 1000
Liquid side/ Gas side mm Ф6.35/Ф9.53 Ф6.35/Ф9.53
Max. refrigerant pipe length m 20 20
Refrigerant piping
Max. difference in level m 8 8
Operation temp
℃
17 ~ 30 17 ~ 30
Ambient temp
℃
-15 ~ 50 -15 ~ 50
The above design and specifications are subject to change without prior notice for product improvement.
9
5. Refrigerant cycle diagram
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