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1-4. INSTALLATION DIAGRAM

2-1. FIXING OF INSTALLATION PLATE

•  Find a structural material (such as a stud) in the wall and fix installation plate (1) hori-

zontally with fixing screws (2).

•  To prevent installation plate (1) from vibrating, be sure to install the fixing screws in 

the holes indicated in the illustration. For added support, fixing screws may also be 
installed in other holes.

•  When bolts recessed in the concrete wall are to be utilized, secure installation plate (1) 

using 11 × 20 · 11 × 26 oval hole (450 mm pitch).

•  If the recessed bolt is too long, change it for a shorter one available in the market.

2-2. WALL HOLE DRILLING

1) Determine the wall hole position.
2) Drill a dia. 65 mm hole. The outdoor side should be 5 to 

7 mm lower than the indoor side.

3) Insert wall hole sleeve (C).

2-3. CONNECTING WIRES FOR INDOOR UNIT

You can connect indoor/outdoor lead wire without removing the front panel.
1) Open the front panel.
2) Remove VA clamp.
3) Pass indoor/outdoor unit connecting wire (A) from the back of the indoor unit and proc-

ess the end of the wire.

4) Loosen terminal screw, and connect first the earth wire, then indoor/outdoor unit con-

necting wire (A) to the terminal block. Be careful not to make mis-wiring. Fix the wire 
to the terminal block securely so that no part of its core is appeared, and no external 
force is conveyed to the connecting section of the terminal block. 

5) Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull 

the wires lightly to confirm that they do not move.

6) Secure indoor/outdoor unit connecting wire (A) and the earth wire with the VA clamp. 

Never fail to hook the left claw of the VA clamp. Attach the VA clamp securely.

2-4. PIPE FORMING AND DRAIN PIPING

Pipe Forming

•  Place the drain hose below the refrigerant piping.
•  Make sure that the drain hose is not heaved or snaked.
•  Do not pull the hose when applying the tape.
•  When the drain hose passes the room, be sure to wrap 

insulation material (obtainable at a store) around it.

ACCESSORIES

Check the following parts before installation.
<Indoor unit>

(1) Installation plate

1

(2)

Installation plate fixing screw 
4 × 25 mm

5

(3) Battery (AAA) for (4)

2

(4) Wireless remote controller

1

(5)

Felt tape 
(For left or left-rear piping)

1

<Outdoor unit>

(6) Drain socket

1

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 x 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

Air inlet

Air outlet

Outdoor unit installation

Units should be installed by licensed contractor 
according to local code requirements.

Terminal block

Fixing screw

Indoor/outdoor unit con-
necting wire (A)

VA clamp

Lead wire

Indoor terminal block

Indoor/outdoor unit 
connecting wire (A)

Outdoor terminal block

Earth wire 
(green/yellow)

•  Make earth wire a little longer than 

others. (More than 60 mm)

•  For future servicing, give extra length 

to the connecting wires.

Liquid pipe

Gas pipe

Felt tape (5) 

Indoor/outdoor unit 
connecting wire (A)

Piping tape (G)

80 mm or 

more

80 mm or 

more

100 mm 

or more

350 mm 

or more

100 

mm 

or more

63 mm or more/ 

115 mm or more for 

left and left back pip

-

ing (using spacer)

Basically open 100 
mm or more without 
any obstruction in 
front and on both 
sides of the unit.

100 mm 

or more

7 mm or 

more

Open two sides of 
left, right, or rear 
side.

Indoor unit

Wall hole 
sleeve (C)

Cut off the 
extra length.

Pipe fixing band 
(E)

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.

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)

After the leak test, apply 

insulating material tightly 
so that there is no gap.

When the piping is to be 

attached to a wall contain-
ing metals (tin plated) or 
metal netting, use a chemi-
cally treated wooden piece 
20 mm or thicker between 
the wall and the piping or 
wrap 7 to 8 turns of insula-
tion 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.

2.  INDOOR UNIT INSTALLATION

Installation plate (1)

Plumb

Align the plumb 
line with the 
mark 

Center of dia. 
65 mm hole

80 mm or 
more 

80 mm or 
more 

Bind the line to the center hole.

63 mm or more

115 mm or more for left and left 
back piping (using spacer)

Ceiling

Wall

Wall

Fixing screw (2)

* Same for left hole.

Insert 

the 
scale. *

Align the 

scale with 
the line. *

4-10 mm × 16 mm slot

Drain piping for outdoor unit 

•  Provide drain piping before indoor 

and outdoor piping connection. 

•  Connect drain hose (I) I.D.15mm 

as shown in the illustration.

•  Make sure to provide drain pip-

ing with a downhill grade for easy 
drain flow.

Note:

Do not use drain socket (6) in cold 
regions. Drain may freeze and make 
the fan stop.

(6)

(I)

Level 

* Note:

Place indoor/outdoor unit connecting wire (A) 
and power supply cord (K)  at least 1 m away 
from the TV antenna wire.

Wall

Outdoor 
side

Summary of Contents for MSZ-HC25VA

Page 1: ...the refrigerant pipes are connected and when the stop valve is open air could be drawn in and the pressure in the refrigeration cycle could become abnormally high This could cause the pipes to burst or injury N Fasten a flare nut with a torque wrench as specified in this manual If fastened too tight a flare nut may break after a long period and cause refrigerant leakage N The unit shall be installed ...

Page 2: ...ose 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 Air inlet Air outlet Outdoor unit installation Units should be installed by licensed contractor according to local code requirements Terminal block Fixing screw Indoor outdoor unit con necting wire A VA clamp Lead wire Indoor terminal block Indoor outdoor unit connecting wire A Outdoor ter...

Page 3: ... and gas pipings to indoor unit Apply a thin coat of refrigeration oil J on the seat surface of pipe For connection first align the center then tighten the first 3 to 4 turns of flare nut Use tightening torque table below as a guideline for indoor unit side union joint section and tighten using two wrenches Excessive tightening damages the flare section Outdoor unit connection Connect pipes to stop va...

Page 4: ... indicated by the arrows in order to attach the assembly completely to the unit Stop valve for GAS Stop valve cap Torque 19 6 to 29 4 N m 200 to 300 kgf cm Vacuum pump or the vacuum pump with the function to prevent the back flow Gauge manifold valve for R410A Compound pressure gauge for R410A 0 101MPa 760 mmHg Handle Low Handle High Adapter for pre venting the back flow Charge hose for R410A Close ...

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