Midea MSX-09HRN1-QC2, MSX-12HRN1-QC2, MSX-18HRN1-QC2, MSX-21HRN1-QB8W, MSX-24HRN1-QB8W Service Manual
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XSEU-A-12
02
SERVICE MANUAL
MIDEA AIRCONDITIONER
EUROPE MARKET
SPLIT WALL-MOUNTED TYPE
X ON-OFF SERIES
CONTENTS
1. Precaution .............................................................................................................................................. 1
1.1 Safety Precaution .......................................................................................................................... 1
1.2 Warning ......................................................................................................................................... 1
2. Function .................................................................................................................................................. 6
3. Dimension............................................................................................................................................... 9
3.1 Indoor Units ................................................................................................................................... 9
3.2 Outdoor Units .............................................................................................................................. 11
4. Refrigerant Cycle Diagram ................................................................................................................... 12
5. Wiring Diagram ..................................................................................................................................... 13
5.1 Indoor Units ................................................................................................................................. 13
5.2 Outdoor Units .............................................................................................................................. 15
6. Installation details ................................................................................................................................ 19
6.1 Wrench torque sheet for installation ........................................................................................... 19
6.2 Connecting the cables ................................................................................................................. 19
6.3 Pipe length and the elevation ...................................................................................................... 20
6.4 Installation for the first time ......................................................................................................... 22
6.5 Adding the refrigerant after running the system for many years ................................................. 25
6.6 Re-installation while the indoor unit need to be repaired ............................................................ 26
6.7 Re-installation while the outdoor unit need to be repaired ......................................................... 28
7. Operation characteristics .................................................................................................................... 31
8. Electronic function ............................................................................................................................... 32
8.1 Abbreviation ................................................................................................................................. 32
8.2 Display function ........................................................................................................................... 32
8.3 Main Protection ........................................................................................................................... 34
9. Troubleshooting ................................................................................................................................... 47
9.1 Indoor unit error display .............................................................................................................. 47
9.2 Diagnosis and Solution ............................................................................................................... 48
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
2
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.
3
There is risk of explosion or fire.
n 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.
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.
4
It can avoid vibration of 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 or 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
5
operated.
There are sharp and moving parts that could cause personal injury.
n Do not drink the water drained from the 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
The designs, and information in this book are subject to change without notice for product improvement.
6
2. Function
Model Names of Indoor/Outdoor Units
Series Capacity Indoor units Outdoor units
On-Off
7k
MSX-07HRN1-QC2 MOA-07HN1-QC2
9k
MSX-09HRN1-QC2 MOA-09HN1-QC2
MSX-09HRN1-QC2 MOA1-09HN1-QC2
12k
MSX-12HRN1-QC2 MOB1-12HN1-QC2
MSX-12HRN1-QC2 MOB-12HN1-QC2
18k
MSX-18HRN1-QC2 MOF-18HN1-QC2
21k
MSX-21HRN1-QB8W MOF1-21HN1-QB8W
24k MSX-24HRN1-QB8W MOF3-24HN1-QB8W
7
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 unit wil
l decide the louver direction according
to operation mode.
Turbo wind, high, med, low, breeze.
Prevent the water being fr
ozen
on evaporator by
checking the evaporator pipe temperature
Indoor units
Operation by remote controller.
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
Auto mode
Temp. Compensation
Flexible wiring connection
Auto defrost
Anti-cold function
Self-diag. function
Auto-restart
Ionizer/Plasma(optional)
Prevent the cold wind at the
beginning of unit start.
Follow me
Golden fin (Optional)
LCD display
8
It protects the valves and prevents water from dr
ipping.
Outdoor units
Power relay control
Valve protection cover
Made from electrolytic zinc steel sheet and anti
-
rust coated components.
Low noise air flow system
Anti-rust cabinet
9
3. Dimension
3.1 Indoor Units
Figure 1:
Figure 2:
10
Figure 3:
Figure 4:
Figure Models
W D H
Figure 1
MSX-07HRN1-QC2
710 195 250
MSX-09HRN1-QC2
Figure 2
MSX-12HRN1-QC2 790 195 265
Figure 3 MSX-18HRN1-QC2 850 225 305
Figure 4
MSX-21HRN1-QB8W
998 235 322
MSX-24HRN1-QB8W
11
3.2 Outdoor Units
More than 30cm
More than 60cm
More than 70cm
More than 30cm
More than 60cm
(Service space
Fence or
obstacles
Model W D H W1 A B
MOA-07HN1-QC2
700 240 540 757 458 250 MOA1-09HN1-QC2
MOA-09HN1-QC2
MOB1-12HN1-QC2
780 250 540 843 549 276
MOB-12HN1-QC2
MOF-18HN1-QC2
845 320 700 908 560 335 MOF1-21HN1-QB8W
MOF3-24HN1-QB8W
12
4. Refrigerant Cycle Diagram
For heat pump models:
INDOOR
OUTDOOR
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
2-WAY VALVE
3-WAY VALVE
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
REVERSING VALVE
(Heating Model only)
COOLING
HEATING
ACCUMULATOR
13
5. Wiring Diagram
5.1 Indoor Units
MSX-07HRN1-QC2 MSX-09HRN1-QC2 MSX-12HRN1-QC2 MSX-18HRN1-QC2
14
MSX-21HRN1-QB8W, MSX-24HRN1-QB8W
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