Midea 9V SERIES User manual

9VSAP-1010-A
SERVICE MANUAL
MIDEA AIRCONDITIONER
On-Off
SPLIT WALL-MOUNTED TYPE
9V SERIES
9220+9221

CONTENTS
1. Precaution .................................................................................................................................................... 1
1.1 Safety Precaution..........................................................................................................................1
1.2 Warning.........................................................................................................................................1
2. Function........................................................................................................................................................ 6
3. Dimension .................................................................................................................................................... 9
3.1 Indoor Unit.....................................................................................................................................9
3.2 Outdoor Unit................................................................................................................................10
4. Refrigerant Cycle Diagram ........................................................................................................................11
5. Wiring Diagram .......................................................................................................................................... 12
5.1 Indoor Unit...................................................................................................................................12
5.2 Outdoor Unit................................................................................................................................14
6. Installation details...................................................................................................................................... 18
6.1 Wrench torque sheet for installation...........................................................................................18
6.2 Connecting the cables ................................................................................................................18
6.3 Pipe length and the elevation .....................................................................................................18
6.4Air purging with vacuum pump....................................................................................................19
6.5 Pumping down (Re-installation)..................................................................................................20
6.6 Re-air purging (Re-installation)...................................................................................................22
6.7 Balance refrigerant of the 2-way, 3-way valves..........................................................................23
6.8 Evacuation ..................................................................................................................................24
6.9 Gas charging...............................................................................................................................25
7. Operation characteristics ......................................................................................................................... 26
8. Electronic function.................................................................................................................................... 27
8.1 Abbreviation ................................................................................................................................27
8.2 Display function...........................................................................................................................27
8.3 Main Protection...........................................................................................................................28
8.4 Operation Modes and Functions.................................................................................................28
9. Troubleshooting......................................................................................................................................... 37
9.1 Indoor Unit Error Display.............................................................................................................37
9.2 Diagnosis and Solution...............................................................................................................38

1
1. Precaution
1.1 Safety Precaution
To prevent injury to the user or other people and property damage, the following
instructions must be followed.
Incorrect operation due to ignoring instruction will cause harm or damage.
Before service unit, be sure to read this service manual at first.
1.2 Warning
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.

2
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 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.

3
Do not use the telephone or turn switches on or off.
There is risk of explosion or fire.
If strange sounds, or small or smoke comes from product. Turn the breaker off or
disconnect the power supply cable.
There is risk of electric shock or fire.
Stop operation and close the window in storm or hurricane. If possible, remove the
product from the window before the hurricane arrives.
There is risk of property damage, failure of product, or electric shock.
Do not open the inlet grill of the product during operation. (Do not touch the electrostatic
filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product 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.

4
A bad connection may cause water leakage.
Keep level even when installing the product.
To avoided 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 or 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.

5
A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or
damage.
Do not insert hands or other object through air inlet or outlet while the product is
operated.
There are sharp and moving parts that could cause personal injury.
Do not drink the water drained from the product.
It is not sanitary could cause serious health issues.
Use a firm stool or ladder when cleaning or maintaining the product.
Be careful and avoid personal injury.
Replace the all batteries in the remote control with new ones of the same type. Do not
mix old and mew batteries or different types of batteries.
There is risk of fire or explosion.
Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
They may burn of explode.
If the liquid from the batteries gets onto your skin or clothes, wash it well with clean
water. Do not use the remote of the batteries have leaked.
The chemical in batteries could cause burns or other health hazards

6
2. Function
Model Names of Indoor/Outdoor Units
Cooling only:
Series Capacity Indoor units Outdoor units
On-Off
7k MS9V-07CR-QB6 MOK2-07C-QB6
9k MS9V-09CR-QB6 MOK6-09C-QB6
12k MS9V-12CR-QB6 MOA1-12C-QB6
18k MS9V-18CR-QB MOB-18C-QB6
Cooling & Heating
Series Capacity Indoor units Outdoor units
On-Off
7k MS9V-07HR-QB6 MOK-07H-QB6
9k MS9V-09HR-QB6 MOK3-09H-QB6
12k MS9V-12HR-QB6 MOB-12H-QB6
18k MS9V-18HR-QB6 MOB-18H-QB6

7
Temp. Compensation
The mode can be change by the room
temperature.
Auto mode
Easy clean panel
Indoor unit
Operation ON/OF by remote controller
Sensing by room temperature
Room temperature control
Starting temperature control
Time Delay Safety control
Indoor fan speed control
Two-direction air vane
Sleep mode auto control
Independent dehumidification
Air flow Direction control
Anti-cold function
Room temperature sensor.
Pipe temperature sensor.
Maintain the room temperature in accordance with
the setting temperature.
Indoor fan is delayed for 5 sec at the starting
Restarting is for approx. 3 minutes..
Auto Restart Function
High, med, low, auto.
The unit will decide the louver direction according
to operation mode.
The fan is turn to low speed (cooling/heating).
The function is usually used in rainy days in
springtime or damp areas.
The louver can be set at the desired position
or swing up and down automatically
Self-diag. function
Timer function
Follow me
Self-cleaning
Prevent the cold wind at the beginning of unit
start.
Auto defrost
Flexible wiring connection
When the power supply is interrupted and then
restore, the air conditioners automatically
restore the previous function setting
Ionizer (optional)
Indoor golden fin (optional)

8
It protects the valves and prevents water from
dripping.
The unit has 3 min 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 for heat pump models
It is only operated in the heating operation mode except defrosting
operation.
Anti-rust cabinet
Valve protection cover
4 way valve control for heat pump models
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.

9
3. Dimension
3.1 Indoor Unit
Dimension
Mode W H D
MS9V-07CR-QB6/MS9V-07HR-QB6 845 290 165
MS9V-09CR-QB6/MS9V-09HR-QB6 845 290 165
MS9V-12CR-QB6/MS9V-12HR-QB6 845 290 165
MS9V-18CR-QB+MS9V-18HR-QB6 995 292 200
For smaller than 18K model:
For 18K model:

10
3.2 Outdoor Unit
MOK2-07C-QB6 MOK-07H-QB6 MOK6-09C-QB6 MOK3-09H-QB6
Dimension Mode
W
D
H
W1
A
B
7K、9K 685 260 430 742 460 276
MOA1-12C-QB6 MOB-12H-QB6 MOB-18C-QB6 MOB-18H-QB6
Dimension Mode
W
D
H
W1
A
B
MOA1-12C-QB6 700 235 535 760 458 250
MOB-12H-QB6
MOB-18C-QB6
MOB-18H-QB6
780 250 540 838 549 276

11
4. Refrigerant Cycle Diagram
Cooling only:
Heat pump mode:

12
5. Wiring Diagram
5.1 Indoor Unit
Cooling only:

13
Cooling & Heating:

14
5.2 Outdoor Unit
Smaller than 18K model:
Cooling only:

15
Cooling & Heating:

16
For 18 K model:
Cooling only:

17
Cooling & Heating:

18
6. Installation details
6.1 Wrench torque sheet for installation
Outside diameter Torque Additional tightening torque
mm inch N·cm N·cm
Ф6.35 1/4 1500
(153kgf.cm) 1600 (163kgf.cm)
Ф9.53 3/8 2500
(255kgf.cm) 2600 (265kgf.cm)
Ф12.7 1/2 3500
(357kgf.cm) 3600 (367kgf.cm)
Ф16 5/8 4500
(459kgf.cm) 4700 (479kgf.cm)
6.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 7K 9K 12K 18K
mm21.5 1.5 1.5 2.5
6.3 Pipe length and the elevation
Capacity
Btu/h
Pipe size Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
Gas Liquid
7K 3/8’’ (Ф9.52) 1/4’’ (Ф6.35) 5 5 10 30
9K 3/8’’ (Ф9.52) 1/4’’ (Ф6.35) 5 5 10 30
12K 1/2’’ (Ф12.7) 1/4’’ (Ф6.35) 5 5 10 30
18K 1/2’’ (Ф12.7) 1/4’’ (Ф6.35) 5 8 15 30