1.  BEFORE INSTALLATION
   1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
 • Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.
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 • After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
 1-2. SELECTING THE INSTALLATION LOCATION
1-3. SPECIFICATIONS
CAUTION
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Required Tools for Installation
Phillips screwdriver
Level
Scale
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65 mm hole saw
Torque wrench
Wrench (or spanner)
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Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
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              Do not install the unit by yourself (user).
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due to the unit falling, or leakage of water. Consult the dealer 
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              Perform the installation securely referring to the installa-
tion manual.
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due to the unit falling, or leakage of water. 
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                    Install the unit securely in a place which can bear the
weight of the unit.
If  the  installation  location  cannot  bear  the  weight  of  the  unit, 
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Perform electrical work according to the installation
manual and be sure to use an exclusive circuit. Do not
connect other electrical appliances to the circuit.
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shock.
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      Earth the unit correctly.
Do  not connect  the earth to  a gas pipe, water pipe, lightning 
rod or telephone earth. Defective earthing could cause electric 
shock.
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Do not damage the wires by applying excessive pressure
with parts or screws.
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Be sure to cut off the main power in case of setting up the
indoor P.C. board or wiring works.
Failure to do so could cause electric shock.
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block connecting sections so the stress of the wires is
not applied to the sections.
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may leak.
If  gas  leaks  and  accumulates  in  the  area  around  the  unit,  it 
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                  Do not use intermediate connection of the power cord or
the extension cord and do not connect many devices to
one AC outlet.
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etc.
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the installation work.
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When plugging the power supply plug into the outlet,
make sure that there is no dust, clogging, or loose parts
in both the outlet and the plug. Make sure that the power
supply plug is pushed completely into the outlet.
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Attach the electrical cover to the indoor unit and the
service panel to the outdoor unit securely.
If  the electrical  cover of  the  indoor unit  and/or the  service 
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When installing or relocating the unit, make sure that no
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enters the refrigerant circuit.
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Do not discharge the refrigerant into the atmosphere. If
refrigerant leaks during installation, ventilate the room.
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generated.
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Check that the refrigerant gas does not leak after installa-
tion has been completed.
If  refrigerant  gas  leaks  indoors,  and  comes  into  contact  with 
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substances will be generated.
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Use appropriate tools and piping materials for installa-
tion.
The pressure  of R410A is 1.6 times more than R22. Not  us-
ing  appropriate  tools  or  materials  and  incomplete  installation 
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When pumping down the refrigerant, stop the compressor
before disconnecting the refrigerant pipes.
If  the  refrigerant  pipes  are disconnected  while  the  compres-
sor is running and the stop valve is open, air could be drawn 
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When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
If  the  compressor  is started  before  the  refrigerant  pipes  are 
connected  and when the  stop valve is  open, air  could be 
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this manual.
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and cause refrigerant leakage.
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The unit shall be installed in accordance with national
wiring regulations.
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Install an earth leakage breaker depending on the installa-
tion place.
If  an earth  leakage  breaker is  not installed,  it  could cause 
electric shock.
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            Perform the drainage/piping work securely according to
the installation manual.
If there is defect in the drainage/piping work, water could drop 
from the unit, soaking and damaging household goods.
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outdoor unit.
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                  Do not install the outdoor unit where small animals may
live.
If  small  animals  enter  and  touch  the  electric  parts  inside  the 
unit,  it  could cause  a  malfunction, smoke  emission,  or  fire. 
Also, advise user to keep the area around the unit clean. 
INDOOR UNIT
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 • Where cool air spreads over the entire room.
 • Rigid wall without vibration.
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fected device.
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incandescent  lights  (so  the  infrared  remote  control  can 
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REMOTE CONTROLLER
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 • Where children cannot touch it.
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mote controller holder to a pillar or wall and install wire-
less remote controller.
Note:
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received.
OUTDOOR UNIT
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 • Where rain or direct sunlight can be avoided as much as 
possible.
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or hot air.
 • Where  rigid wall  or  support  is  available to  prevent  the 
increase of operation sound or vibration.
 • Where there is no risk of combustible gas leakage.
 • When installing the unit at a high level, be sure to secure 
the unit legs.
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radio or  TV  reception  in  areas  where  reception is weak. 
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Note:
It is advisable to make a piping loop near outdoor unit so as 
to reduce vibration transmitted from there.
 *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
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shall be installed in accordance with national wiring regulations.
 *3 Never  use  pipes with  thickness less  than  specified. The 
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 *5 Be careful not to crush or bend the pipe during pipe bending.
 *6 Refrigerant pipe bending radius must be 100 mm or more.
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charge  is required.  (No  additional charge  is required  for 
pipe length less than 7 m.)
Additional refrigerant = A × (pipe length (m) - 5)
 *8 Insulation  material  : Heat  resisting  foam plastic  0.045 
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Note:
When operating the air conditioner in low outside tempera-
ture, be sure to follow the instructions described below.
 • Never  install  the  outdoor  unit  in  a  place  where  its  air 
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with its air inlet side facing the wall.
•
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Avoid the following places for installation where air condi-
tioner trouble is liable to occur.
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 • Where there is much machine oil.
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 WARNING &RXOGOHDGWRGHDWKVHULRXVLQMXU\HWF
SG79Y970H10
SPLIT-TYPE AIR CONDITIONERS
INSTALLATION MANUAL
 ENGLISH
Model names are indicated in 1-3.
When installing multi units, refer to 
the installation manual of the multi 
unit for outdoor unit installation.
  Model 3RZHUVXSSO\ :LUHVSHFL¿FDWLRQV Pipe size 
(thickness *3, *4)
 Indoor unit Outdoor unit Rated
Voltage )UHTXHQF\ Breaker
FDSDFLW\
3RZHUVXSSO\
3-core
Indoor/outdoor
connecting wire
Gas / Liquid
MSZ-FD25VA(S)
MUZ-FD25VAH-E1
 230 V 50 Hz
 12 A 1.5 mm2
4-core
1.0 mm2
ø9.52 / 6.35 mm
(0.8 mm)
   MUZ-FD25VAH-E2 10 A 1.5 mm2
MUZ-FD25VABH
MUZ-FD25VA  10 A 1.0 mm2
MSZ-FD35VA(S)    MUZ-FD35VA(B)H 12 A 1.5 mm2
   MUZ-FD35VA 10 A 1.0 mm2
Pipe length and height difference
0D[SLSHOHQJWK 20 m
 0D[KHLJKWGLIIHUHQFH 12 m
 0D[QXPEHURIEHQGV 10
 Refrigerant adjustment A *7 30 g/m
Insulation thickness *8, *9
8 mm