Midea MFJ-24ARN1-QB8, MFJ-48ARN1-RB6 Service Manual
Model:
MFJ-24ARN1-QB8
MFJ-48ARN1-RB6
Floor Standing Type Air Conditioner
Content
CONTENT
1
Safety Precautions .......................................................................................... 1
1.1 Precaution .................................................................................................................... 1
1.2 Installation ................................................................................................................... 1
1.3 Caution ......................................................................................................................... 1
1.4 Operational .................................................................................................................. 1
3
Out Dimensions ............................................................................................... 3
3.1 Indoor Unit ................................................................................................................... 3
3.2 Outdoor Unit ................................................................................................................. 4
4
External view and display ............................................................................... 5
4.1 External view ................................................................................................................ 5
4.2 Display panel ............................................................................................................... 6
5
Refrigerant cycle diagram .............................................................................. 7
5.1 Cooling only .................................................................................................................. 7
5.2 Heat pump mode ......................................................................................................... 7
6
PCB drawing & wiring diagram ...................................................................... 8
6.1 MFJ-24ARN1-QB8 ........................................................................................................ 8
6.2 MFJ-48ARN1-RB6 ........................................................................................................ 9
7
Installation detail ........................................................................................... 10
7.1 Installation place ....................................................................................................... 10
7.2 Installing ..................................................................................................................... 11
7.3 Refrigerant pipe connecting .....................................................................................13
7.4 Drain Pipe of The Indoor Unit ...................................................................................15
7.5 Wiring .........................................................................................................................15
7.6 Test operation ............................................................................................................ 16
8
Electronic function ........................................................................................ 17
8.1 Performance Index .................................................................................................... 17
8.2 Main data Introduction.............................................................................................. 17
8.3 Operation Modes and Functions .............................................................................. 17
8.4 Other Functions .........................................................................................................19
9
Characteristic of temperature sensor ......................................................... 20
10 Trouble shooting ........................................................................................... 21
10.1 Protective Function .................................................................................................... 21
10.2 Self-diagnosis ............................................................................................................ 21
10.3 Troubles and Solutions ............................................................................................. 22
Safety Precautions
1
1 Safety Precautions
1.1 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 Installation
For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized service
center.
Do not disassemble or repair the product by yourself.
Sharp edges could cause injury, be especially careful of the case edges and the fins on the
condenser and evaporator.
Be sure the installation area does not deteriorate with age.
Take care to ensure that power cable could not be pulled out or damaged during operation.
Do not place anything on the power cable.
Do not plug or unplug the power supply plug during operation.
Do not store or use flammable gas or combustible near the product.
When flammable gas leaks, turn off the gas and open a window for ventilation before turn the
product on.
If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the
power supply cable as soon as possible.
When the product is soaked (flooded or submerged), contact an Authorized service center.
Be caution that water could not enter the product.
Turn the main power off when cleaning or maintaining the product.
When the product is not be used for a long time, disconnect the power supply plug or turn off the
breaker.
1.3 Caution
Always check for gas (refrigerant) leakage after installation or repair of product.
Install the drain hose to ensure that water is drained away properly.
Keep level even when installing the product.
Do not install the product where the noise or hot air from the outdoor unit could damage the
neighborhoods.
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.
1.4 Operational
Do not expose the skin directly to cool air for long periods of 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.
Do not block the inlet or outlet of air flow.
Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
Safety Precautions
2
Do not touch the metal parts of the product when removing the air filter. They are very sharp.
Do not step on pr put anything on the product. (outdoor units)
Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
Do not insert hands or other object 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.
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.
Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
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.
Outer Dimensions
3
2 Out Dimensions
2.1 Indoor Unit
Dimension
Mode
Width
(mm)
Height
(mm)
Depth
(mm)
24K 500 1700 290
48K 540 1825 410
Outer Dimensions
4
2.2 Outdoor Unit
Dimension
Mode
W idth
(mm)
Height
(mm)
Depth
(mm)
A
(mm)
B
(mm)
24K
840
695
335
560
335
Dimension
Mode
W idth
(mm)
Height
(mm)
Depth
(mm)
A
(mm)
B
(mm)
48K
940
1245
360
602
380
External view and display
5
3 External view and display
3.1 External view
1
2
3
4
5
6
7
8
11
10
9
Ou tdoor unit
1
Air outle t
2
Operation panel
3
Hori zo ntal airf lo w co nt ro l l ouve r
4
Vertical ai rflo w co ntr ol louve r
5
Remote con troller holder( on so me mod els)
6
Air inl et(2 sides )
7
Drain pi pe , vent pip e
8
Co nn ectio n cabl e
9
Co nn ectio n pipe
10
Refrigerant pipe po rt
11
Air outlet
In door un i t
Note: All the pictures in this manual are for explanation purpose only. They may be slightly
different from the air conditioner you purchased(depend on model). The actual shape shall prevail.
External view and display
6
3.2 Display panel
au to
T2
T3
T4
T1
OFF
ON
AUX IL IARY
FU NCT ION
M ODE
FA N
S PEED
A DJU ST
M ODE
A DJU ST
LOCK
TE ST
RUN NING
ON /OF F
1
2 3 4 5 6
57
In di c ators
Auto op eration display
Co ol ing op er at ion d i sp l ay
Dry op era tio n display
Heating operati on di sp lay
Fa n op era tion di s play
Vert ical ai r f low di spl ay
Hor i zontal airflo w disp lay
Slee p opera ti on display
Turbo ope rat io n displa y
On t imer op eration display
Of f timer operati on dis play
Loc k oper a tion di s pl ay
Fa n spe ed
operat io n display
Room Te mp/Set Temp
/Set Tim er displa y
Refrigerant cycle diagram
7
4 Refrigerant cycle diagram
4.1 Cooling only
4.2 Heat pump mode
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