Midea MS9V-18HRDN1-QC2(B) 9V, MS9V-24HRDN1-QC2W 9V, MS9V-09HRDN1-QC2 9V, MS9V-12HRDN1-QC2 9V Service Manual
9VSI-1010-A
SERVICE MANUAL
MIDEA AIRCONDITIO NER
DC INVERTER
SPLIT WALL-MOUNTED TYPE
MS9V-18HRDN1-QC2(B)
MS9V-24HRDN1-QC2W
9V SERIES
CONTENTS
1. Precaution .................................................................................................................................................... 1
1.1 Safety Precaution .......................................................................................................................... 1
1.2 Warning ......................................................................................................................................... 1
2. Function ........................................................................................................................................................ 6
3. Dimension .................................................................................................................................................... 8
3.1 Indoor Unit ..................................................................................................................................... 8
3.2 Outdoor Unit ................................................................................................................................ 10
4. Refrigerant Cycle Diagram ........................................................................................................................ 11
5. Wiring Diagram .......................................................................................................................................... 12
5.1 Indoor .......................................................................................................................................... 12
5.2 Outdoor Unit ................................................................................................................................ 13
6. Installation details ...................................................................................................................................... 14
6.1 Wrench torque sheet for installation ........................................................................................... 14
6.2 Connecting the cables ................................................................................................................ 14
6.3 Pipe length and the elevat ion ..................................................................................................... 14
6.4 Air pur ging with vacuum pump .................................................................................................... 15
6.5 Pumping down (Re-installation) .................................................................................................. 16
6.6 Re-air purging (Re-installation) ................................................................................................... 18
6.7 Balance refrigerant of t he 2-way, 3-way va lves .......................................................................... 19
6.8 Evacuation .................................................................................................................................. 20
6.9 Gas charging ............................................................................................................................... 21
7. Operation characteristics ......................................................................................................................... 22
8. Electronic function .................................................................................................................................... 23
8.1 Abbreviation ................................................................................................................................ 23
8.2 Display function ........................................................................................................................... 23
8.3 Main Protection ........................................................................................................................... 24
8.4 Operation Modes and Function s ................................................................................................. 25
9. Tr o u b leshooting ......................................................................................................................................... 37
9.1 Indoor Unit Error Display ............................................................................................................. 38
9.2 Diagnosis and Solution ............................................................................................................... 39
1. Precaution
1.1 Safety Precaution
To prevent injury t o the user or other people a nd property damage, t he following
instructions must be followed.
Incorrect oper ation due to ignoring inst ruction will cause harm or damage.
Before service unit, be sure t o read this service manual at first.
1.2 Warning
Installation
Do not use a defective or under r ated circuit breaker. Use this appliance on a dedicat ed
circuit.
There is risk of fire or electric shock.
For electrical work, co ntact the dealer, seller , a qualified electrician, or an Authorized
service center.
Do not disassemble or repair the product, there is risk of fire or elect r ic shock.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control b ox securely.
There is risk of fire of electr ic shock.
Always install a dedicated circuit and breaker.
Improper wiring or inst allation may cause fore or electric shock.
Use the correctly r at ed breaker of fuse.
There is risk of fire or electr ic shock.
Do not modify or extend the power cable.
There is risk of fire or electr ic shock.
Do not install, remove, or reinstall the unit by yourself(customer).
There is risk of fire, electric s hock, explosion, or injury.
1
2
Be caution whe n unpacking and installing the p roduct.
Sharp edges could cause inj ur y, be especially careful of the case edges and t he f ins on the
condenser and evaporat or.
For installati on, always contact the dealer or an Authorized service center.
There is risk of fire, electric s hock, explosion, or injury.
Do not inst a l l the product on a defect ive installation stand.
It may cause injury, accident, or damage t o t he pr oduct.
Be sure the install at i on area does not deteriorate with age.
If the base collapses, the air conditioner could fall with it, caus ing property damage, product failure,
and personal injury.
Do not let the air conditioner run for a long time when the humi dity is very high and a
door or a windo w is l e ft open.
Moisture may condense and wet or damage furniture.
Take care to ensure t hat power cable could not be pulled out or damaged during
operation.
There is risk of fire or electr ic shock.
Do not place anything on the power cable .
There is risk of fire or electr ic shock.
Do not plug or unplug t he power supply pl ug during operation.
There is risk of fire or electr ic shock.
Do not touch (operation) the product with wet hands.
There is risk of fire or electr ic 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 us e flammable gas or combustible near the pro duct.
There is risk of fire or failure of product.
Do not use the product in a tightly close d space for a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off the gas and open a windo w f or ventilation before
3
turn 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 arrives.
There is risk of property dam age, failure of product, or electric shock.
Do not open the inl et gril l of the pro duct dur ing o perati on. ( Do not to uch the electr ost at ic
filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
When the product i s soaked (flooded or s ubmerged), contact an Authorized service
center.
There is risk of fire or electr ic shock.
Be caution that water could not enter the product.
There is risk of fire, electric s hock, or product damage.
Ventilate the product from time to time when operating it together with a stove, etc.
There is risk of fire or electr ic shock.
Turn the main power off when cleaning or maintaining the product.
There is risk of electric shock.
When the product i s not be used for a long time, disconnect the power supply plug or
turn off the breaker.
There is risk of product damage or f ailure, or unintended operation.
T ake care to ensure that nobody coul d step on or fall onto the outdoor unit.
This could result in personal injury and product damage.
CAUTION
Always check for gas (refr i gerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.
4
Install the drain hose to ensure that water i s drained away properly.
A bad co nnection may cause water leakage.
Keep level even when installing the product.
To avoided vibration of wat er leakage.
Do not inst a l l the product where the noise or hot ai r from the outdo or u n it could dam age
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 t he product where it will be exposed to se a wind (salt spray) directly.
It may cause corrosion on the product. Corro s i on, particularly on the condenser and evaporator fins,
could cause product malfunction or inefficient operat i on.
Operational
Do not expose th e sk i n directly to cool air f or long periods of time. (Do not sit in the
draft).
This could harm to your health.
Do not use the product for special purp oses, suc h as preserving fo ods, works of art, etc.
It is a consumer air condit i oner, not a precisio n 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 failu r e.
Use a soft cloth to cl ean. Do not use harsh detergents, solvents, etc.
There is risk of fire, electric s hock, or damage to the plastic parts of the product.
Do not touch the m etal parts of the product when r emoving the air filter. They are very
sharp.
There is risk of personal injury.
Do not step on or p ut anything on the prod uc t . (outdoor units)
There is risk of personal injury and f ai lur e of product.
Always insert the filt er securely. Clean the filter every two weeks or mor e often if
5
necessary.
A dirty filter reduces the efficiency of the air conditioner and could cause product ma lfunction or
damage.
Do not insert ha nds or other object thro ugh 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 ca use serious health issues.
Use a firm stool or l a dder when cleaning or m aintaining the product.
Be careful and avoid pers onal injury .
Replace the all batteries in the remote control with new ones of t he 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 disa ssemble the batteries. Do not dispose of bat t er i es in a fire.
They may burn of explode.
If the liquid from t he batteries gets onto your skin or clothes, wash it well with clean
water. D o not use the remote of the batteries have leaked.
The chemical in batteries could cause burns or other health hazards
6
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
Anti-cold function
Room temperature sensor.
Pipe temperature sensor.
Maintain the room temperature in accordance with
the setting temperature.
Prevent the water being frozen on evaporator by sensing
the evaporator pipe temperature in cooling mode
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
Temp. Compensation
Auto mode
The mode can be change by the room
temperature.
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)
2. Function
7
It protects the valves and prevents water from dripping.
The unit has 3 min delay between continuously ON/OFF operations .
Outdoor uni t
Power relay control
The hydrophilic fin can im prove the heating efficiency at operation mode.
Hydrophilic aluminum fin
It is only operated in the heatin g oper ation mode except defrosting operat ion.
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 sy st em
Bird tail propeller fan m akes the outdoor unit run mor e quietly.
Discharge pipe temperature protect
Chassis heating belt (Optional)
.
Driving heating at -15℃
8
Dimension
Mode
MS9V-18HRDN1-QC2(B)
295
200
MS9V-24HRDN1-QC2W
320
221
3. Dimension
3.1 Indoor Unit
MS9V-18HRDN1-QC2(B)
W H D
995
1084
9
MS9V-24HRDN1-QC2W：
10
Dimension Mode
W D H
W1 A B
18K
760
285
590
823
530
290
Dimension Mode
W D H
W1 A B
3.2 Outdoor Unit
MOC2-18HDN1-QC2
MOF-24HDN1-QC2W
24K 845 335 695 918 560 335
11
4. Refrigerant Cycle Diagram
12
5. Wiring Diagram
5.1 Indoor
MS9V-18HRDN1-QC2(B)
MS9V-24HRDN1-QC2
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