Midea MS9A-07HRN1-QB6 User manual

LUNA ON-OFF SERIES
Service Manual 2014
9ASEU-B1-1401

CONTENTS
1. Precaution .................................................................................................................................................... 1
1.1 Safety Precaution..........................................................................................................................1
1.2 Warning.........................................................................................................................................1
2. Function........................................................................................................................................................ 5
3. Dimension .................................................................................................................................................... 7
3.1 Indoor Units...................................................................................................................................7
3.2 Outdoor Units..............................................................................................................................10
4. Refrigerant Cycle Diagram ....................................................................................................................... 12
5. Wiring Diagram .......................................................................................................................................... 13
5.1 Indoor Units.................................................................................................................................13
5.2 Outdoor Units..............................................................................................................................17
6. Installation details...................................................................................................................................... 22
6.1 Wrench torque sheet for installation........................................................................................... 22
6.2 Connecting the cables ................................................................................................................22
6.3 Pipe length and the elevation .....................................................................................................23
6.4 Installation for the first time.........................................................................................................24
6.5Adding the refrigerant after running the system for many years ................................................ 27
6.6 Re-installation while the indoor unit need to be repaired ...........................................................28
6.7 Re-installation while the outdoor unit need to be repaired.........................................................30
7. Operation characteristics ......................................................................................................................... 33
8. Electronic function.................................................................................................................................... 34
8.1 Abbreviation ................................................................................................................................34
8.2 Display function...........................................................................................................................34
8.3 Main Protection...........................................................................................................................35
8.4 Operation Modes and Functions.................................................................................................36
9. Troubleshooting......................................................................................................................................... 47
9.1 Indoor unit error display..............................................................................................................47
9.2 Diagnosis and Solution...............................................................................................................48

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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 the 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

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condenser and evaporator.
For installation, always contact the dealer or an authorized service center.
Do not install the product on a defective installation stand.
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.
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.
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 electrical 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.
If strange sounds 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.

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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, 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.
It can 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.
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,

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could cause product malfunction or inefficient operation.
Operational
Do not expose the skin directly to cool air for long time. (Do not sit in the draft).
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 the air flow.
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.
Do not step on or put anything on the product. (outdoor units)
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 objects through air inlet or outlet while the product is
operated.
Do not drink the water drained from the product.
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 new 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.

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2. Function
Model Names of Indoor/Outdoor Units
Series Capacity Indoor units Outdoor units
On-Off
7k MS9A-07HRN1-QB6 MOK-07HN1-QB6 MS9A-07HRN1-QB6 MOK1-07HN1-QB6
MS9A-07HRN1-QC2 MOK1-07HN1-QC2
9k
MS9A-09HRN1-QB6 MOK1-09HN1-QB6
MS9A-09HRN1-QB8 MOK-09HN1-QB8
MS9A-09HRN1-QC2 MOA1-09HN1-QC2
MS9A-09HRN1-QC2 MOA3-09HN1-QC2
MS9A-09HRN1-QC7G MOB1-09HN1-QC7
11k MS9A-11HRN1-QB8 MOA-11HN1-QB8
12k MS9A-12HRN1-QC2 MOB1-12HN1-QC2 MS9A-12HRN1-QC2 MOB3-12HN1-QC2
MS9A-12HRN1-QC7G MOB-12HN1-QC7
16k MS9A-16HRN1-QB8(A) MOB1-18HN1-QB6
MS9A-16HRN1-QB6 MOB3-16HN1-QB6
17k MS9A-17HRN1-QC0 MOC-17HN1-QC0
18k MS9A-18HRN1-QC0 MOC-18HN1-QC0 MS9A-18HRN1-QB6 MOB1-18HN1-QB6
MS9A-18HRN1-QC5 MOF3-18HN1-QC5
24k MS9A-24HRN1-QB8W MOP-24HN1-QB8W
MS9A-24HRN1-QB8W MOF1-24HN1-QB8W

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Filter
Ionizer+(O)
Ionizer(O)
Silver Ico Filter(O)
Vitamin C Filter(O)
3M HAM Filter(O)
Bio Filter(O)
Golden Fin(O)
Cold catalyst filter
Compressor Crankcase Heater(O)
Self Clean(O)
Follow me(O)
8 degree heating(O)
Heat compensation(O)
Self-diag. function
H ydrophilic aluminum fin
Anti-rust cabinet
Valve protection cover
PTC Heating Belt(O)
O: optional function

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3. Dimension
3.1 Indoor Units
WD
H
Model W D H
MS9A-07HRN1-QB6
710 190 250
MS9A-07HRN1-QC2
MS9A-09HRN1-QC2
MS9A-09HRN1-QB8
MS9A-09HRN1-QB6
MS9A-09HRN1-QC7G
790 198 265
MS9A-11HRN1-QB8
MS9A-12HRN1-QC2
MS9A-16HRN1-QB8(A)
MS9A-12HRN1-QC7G
920 223 292
MS9A-16HRN1-QB6
MS9A-17HRN1-QC0
MS9A-18HRN1-QB6
MS9A-18HRN1-QC0
MS9A-18HRN1-QC5
998 240 322
MS9A-24HRN1-QB8W

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LR
H
Model R(mm) L(mm) H(mm) Dimension of installation hole(mm)
MS9A-07HRN1-QB6
110100 45
￠65
MS9A-07HRN1-QC2
MS9A-09HRN1-QB6
MS9A-09HRN1-QB8
MS9A-09HRN1-QC2
MS9A-09HRN1-QC7G
150100 45
MS9A-11HRN1-QB8
MS9A-12HRN1-QC2
MS9A-16HRN1-QB8(A)

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Model R(mm) L(mm) H(mm) Dimension of installation hole(mm)
MS9A-18HRN1-QC5 120 100 45 ￠65
MS9A-24HRN1-QB8W
Model
R(mm)
L(mm)
H(mm)
Dimension of installation hole(mm)
MS9A-12HRN1-QC7G
185 150 45 ￠65
MS9A-16HRN1-QB6
MS9A-17HRN1-QC0
MS9A-18HRN1-QB6
MS9A-18HRN1-QC0
H
L R

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3.2 Outdoor Units
More than 30cm
More than 60cm
More than 200cm
More than 30cm
More than 60cm
(Service space)
Fence or
obstacles

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Model
W
D
H
W1
A
B
MOK-07HN1-QB6
685 260 430 742 460 276
MOK1-07HN1-QB6
MOK1-07HN1-QC2
MOK1-09HN1-QB6
MOK-09HN1-QB8
MOA1-09HN1-QC2
700 240 540 757 458 250
MOA3-09HN1-QC2
MOA-11HN1-QB8
MOB1-09HN1-QC7
780 250 540 843 549 276
MOB-12HN1-QC7
MOB3-16HN1-QB6
MOB1-12HN1-QC2
MOB3-12HN1-QC2
MOB1-18HN1-QB6
MOC-17HN1-QC0
760 285 590 823 530 290
MOC-18HN1-QC0
MOP-24HN1-QB8W
820 330 595 870 523 340
MOF3-18HN1-QC5
845 320 700 908 560 335
MOF1-24HN1-QB8W

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4. Refrigerant Cycle Diagram
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
2-WAY VALVE
3-WAY VALVE
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
T3 Condenser
temp. sensor
ACCUMULATOR
INDOOR OUTDOOR
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
T3 temp. sensor is only for 21k,24k models.

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5. Wiring Diagram
5.1 Indoor Units
MS9A-07HRN1-QB6, MS9A-07HRN1-QC2, MS9A-09HRN1-QB6,MS9A-09HRN1-QB8,
MS9A-09HRN1-QC2, MS9A-09HRN1-QC7G,MS9A-11HRN1-QB8, MS9A-12HRN1-QC2,
MS9A-16HRN1-QB6,MS9A-16HRN1-QB8(A),MS9A-17HRN1-QC0, MS9A-18HRN1-QB6
，
MS9A-18HRN1-QC0

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MS9A-12HRN1-QC7G

15
MS9A-18HRN1-QC5

16
MS9A-24HRN1-QB8W

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5.2 Outdoor Units
MOK-07HN1-QB6, MOK1-07HN1-QB6,MOK1-07HN1-QC2, MOK1-09HN1-QB6, MOK-09HN1-QB8,
MOA1-09HN1-QC2,MOA3-09HN1-QC2,MOB1-09HN1-QC7, MOA-11HN1-QB8,MOB-12HN1-QC7,
MOB3-12HN1-QC2, MOB1-12HN1-QC2, MOB3-16HN1-QB6,MOB1-18HN1-QB6

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MOC-17HN1-QC0