Mitsubishi Electric MFZ-KJ25VE, Installation Manual

En-

Indoor unit

Wall hole 

sleeve (C)

Cut off the extra 
length.

Pipe fixing band 

(E)

Wall hole cover (D)

Seal the wall hole 

gap with putty (H).

Fix the pipe to wall 

with pipe fixing 

band (E).

Fixing screw 

(F)

1-3. sPECIFICatIons

1-4. INSTALLATION DIAGRAM

aCCEssoRIEs

Check the following parts before installation.

(1)

Drain hose*

1

(2)

Remote controller holder

1

(3) Fixing screw for (2) 3.5 × 16 mm (Black)

2

(4)

Pipe cover

1

(5)

Band

2

(6) Battery (AAA) for (12)

2

(7)

Indoor unit mounting bracket

1

(8) Fixing screw for (7) 4 × 25 mm

5

(9) Wood screw for indoor unit fixation

4

(10) Washer of (9)

4

(11) Felt tape (For left or left-rear piping)

1

(12)

Wireless remote controller

1

(13) Air cleaning filter

2

* note:

The Drain hose is connected to the unit.

<Outdoor unit>

(14) Drain socket (VE type only)

1

Units should be installed by licensed 

contractor according to local code 
requirements.

After the leak test, apply insulating material tightly so that there is no gap.

Be sure to use wall hole 

sleeve (C) to prevent indoor/

outdoor connecting wire (A) 

from contacting metal parts 
in the wall and to prevent 

damage by rodents in case 

the wall is hollow.

PaRts to BE PRoVIDED at YouR sItE

(A)

Indoor/outdoor unit connecting wire*

1

(B)

Extension pipe

1

(C)

Wall hole sleeve

1

(D)

Wall hole cover

1

(E) Pipe fixing band

2 to 5

(F) Fixing screw for (E) 4 × 20 mm

2 to 5

(G)

Piping tape

1

(H) Putty

1

(I)

Drain hose 
(or soft PVC hose, 15 mm inner dia. or 

hard PVC pipe VP16)

1 or 2

(J)

Refrigeration oil

1

(K) Power supply cord*

1

* note:

Place indoor/outdoor unit connecting wire (A) and 

power supply cord (K) at least 1 m away from the TV 

antenna wire.

150 mm or below 

from the floor

100 mm or more

No obstruction

100 mm or more

*1  Connect to the power switch which has a gap of 3 mm 

or more when open to interrupt the source power phase. 
(When the power switch is shut off, it must interrupt all 

phases.)

*2  Use wires in conformity with design 60245 IEC 57.

*3  Never use pipes with thickness less than specified. The 

pressure resistance will be insufficient.

*4  Use a copper pipe or a copper-alloy seamless pipe.

*5  Be careful not to crush or bend the pipe during pipe bend-

ing.

*6  Refrigerant pipe bending radius must be 100 mm or more.

*7  If pipe length exceeds 7 m, additional refrigerant (R410A) 

charge is required. (No additional charge is required for 

pipe length less than 7 m.)

  Additional refrigerant = A × (pipe length (m) – 7)

*8  Insulation material : Heat resisting foam plastic 0.045 

specific gravity

*9  Be sure to use the insulation of specified thickness. Ex

-

cessive  thickness  may cause incorrect  installation  of the 

indoor unit and insufficient thickness may cause dew drip

-

page.

Model

Power supply *1

Wire specifications *2

Pipe size  

(thickness *3, *4)

Indoor unit

Outdoor unit

Rated Voltage

Frequency

Breaker 

capacity

Power supply

(3-core)

Indoor/outdoor 

connecting wire

Gas / Liquid

MFZ-KJ25VE
MFZ-KJ35VE

MUFZ-KJ25VE
MUFZ-KJ35VE

230 V

50 Hz

10 A

1.0 mm

2

4-core  

2.0 mm

2

ø9.52 / 6.35 mm

(0.8 mm)

MFZ-KJ50VE

MUFZ-KJ50VE(HZ)

16 A

2.0 mm

2

ø12.7 / 6.35 mm

(0.8 mm)

(KJ25, 35/KJ50)

Pipe length and height difference

Max. pipe length

20/30 m

Max. height difference

12/15 m

Max. number of bends *5, *6

10

Refrigerant adjustment A *7

30/20 g/m

Insulation thickness *8, *9

8 mm

(KJ25, 35/KJ50)

100/500 mm or more

100 mm 

or more

(KJ25, 35/KJ50)

200/500 mm or more

350 mm 

or more

100 mm 

or more

Appearance of the 

outdoor unit may differ 

from some models.

Air inlet

Air outlet

outdoor unit installation

 (KJ25, 35/KJ50)

2/4-10 mm × 21 mm slot

800/840 mm

150/175 
mm

500 mm

344.5/390 mm

285/330 mm

304-325/349-371 mm

40 mm

When the piping is to be attached to a wall containing metals (tin 

plated) or metal netting, use a chemically treated wooden piece 20 

mm or thicker between the wall and the piping or wrap 7 to 8 turns of 

insulation vinyl tape around the piping.

To use existing piping, perform COOL operation for 30 minutes and 

pump down before removing the old air conditioner. Remake flare 

according to the dimension for new refrigerant.

Drain piping for outdoor unit 
<VE type only>

• Provide drain piping before indoor and outdoor 

piping connection. 

• Connect drain hose (I) I.D.15 mm as shown in 

the illustration.

• Make sure to provide drain piping with a down-

hill grade for easy drain flow.

(14)

(I)

note:

Install the unit horizontally.

Do  not  use  drain  socket  (14)  in  cold  regions. 

Drain may freeze and make the fan stop.

The outdoor unit produces condensate during 
the heating operation. Select the installation 
place to ensure to prevent the outdoor unit and/

or the grounds from being wet by drain water or 

damaged by frozen drain water.

IMPoRtant notEs                     

To comply with the requirements 

of Australian standard AS/NZS 
3000 electrical installations (wir-

ing rules), the electrical wiring 

required between the indoor and 

outdoor units must be installed by 

a licenced electrical contractor.
 

JG79A867H01_en.indd   2

2014/02/07   15:44:58