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.
• Be sure to observe the warnings and cautions specified here as they include important items related to safety.
• 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
(Could lead to serious injury in particular environments when operated incorrectly.)
Required Tools for Installation
Phillips screwdriver
Level
Scale
Utility knife or scissors
65 mm hole saw
Torque wrench
Wrench (or spanner)
4 mm hexagonal wrench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
N
Do not install the unit by yourself (user).
Incomplete installation could cause fire or electric
shock, injury due to the unit falling, or leakage of water.
Consult the dealer from whom you purchased the unit
or a qualified installer.
N
Perform the installation securely referring to the
installation manual.
Incomplete installation could cause fire or electric
shock, injury due to the unit falling, or leakage of water.
N
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, the unit could fall causing injury.
N
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.
If the capacity of the power circuit is insufficient or there
is incomplete electrical work, it could result in a fire or
an electric shock.
N
Do not damage the wires by applying excessive
pressure with parts or screws.
Damaged wires could cause fire.
N
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.
N
Use the specified wires to connect the indoor and
outdoor units securely and attach the wires firmly
to the terminal block connecting sections so the
stress of the wires is not applied to the sections.
Incomplete connecting and securing could cause fire.
N
Do not install the unit in a place where inflammable
gas may leak.
If gas leaks and accumulates in the area around the
unit, it could cause an explosion.
N
Do not use intermediate connection of the power
cord or the extension cord and do not connect
many devices to one AC outlet.
It could cause a fire or an electric shock due to defec-
tive contact, defective insulation, exceeding the permis-
sible current, etc.
N
Be sure to use the parts provided or specified parts
for the installation work.
The use of defective parts could cause an injury or leak-
age of water due to a fire, an electric shock, the unit
falling, etc.
N
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 com-
pletely into the outlet.
If there is dust, clogging, or loose parts on the power
supply plug or the outlet, it could cause electric shock or
fire. If loose parts are found on the power supply plug,
replace it.
N
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 serv-
ice panel of the outdoor unit are not attached securely,
it could result in a fire or an electric shock due to dust,
water, etc.
N
When installing or relocating the unit, make sure
that no substance other than the specified refriger-
ant (R410A) enters the refrigerant circuit.
Any presence of foreign substance such as air can
cause abnormal pressure rise or an explosion.
N
Do not discharge the refrigerant into the atmos-
phere. If refrigerant leaks during installation, venti-
late the room.
If refrigerant comes in contact with a fire, harmful gas
could be generated.
N
Check that the refrigerant gas does not leak after
installation has been completed.
If refrigerant gas leaks indoors, and comes into contact
with the flame of a fan heater, space heater, stove, etc.,
harmful substances will be generated.
N
Use appropriate tools and piping materials for
installation.
The pressure of R410A is 1.6 times more than R22.
Not using appropriate tools or materials and incomplete
installation could cause the pipes to burst or injury.
N
When pumping down the refrigerant, stop the com-
pressor before disconnecting the refrigerant pipes.
If the refrigerant pipes are disconnected while the com-
pressor is running and 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
When installing the unit, securely connect the re-
frigerant 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 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 in accordance with na-
tional wiring regulations.
N
Earth the unit correctly.
Do not connect the earth to a gas pipe, water pipe, light-
ning rod or telephone earth. Defective earthing could
cause electric shock.
N
Install an earth leakage breaker depending on the
installation place.
If an earth leakage breaker is not installed, it could
cause electric shock.
N
Perform the drainage/piping work securely accord-
ing to the installation manual.
If there is defect in the drainage/piping work, water
could drop from the unit, soaking and damaging house-
hold goods.
N
Do not touch the air inlet or the aluminum fins of
the outdoor unit.
This could cause injury.
N
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
• Where airflow is not blocked.
• Where cool air spreads over the entire room.
• Rigid wall without vibration.
• Where it is not exposed to direct sunshine.
• Where easily drained.
• At a distance 1 m or more away from your TV and radio.
Operation of the air conditioner may interfere with radio
or TV reception in areas where reception is weak. An
amplifier may be required for the affected device.
• In a place as far away as possible from fluorescent and
incandescent lights (so the infrared remote control can
operate the air conditioner normally).
• Where the air filter can be removed and replaced easily.
OUTDOOR UNIT
• Where it is not exposed to strong wind.
• Where airflow is good and dustless.
• Where it is not exposed to rain and direct sunshine.
• Where neighbours are not annoyed by operation sound
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.
• Where it is at least 3 m away from the antenna of TV set
or radio. Operation of the air conditioner may interfere with
radio or TV reception in areas where reception is weak.
An amplifier may be required for the affected device.
• Install the unit horizontally.
• Please install it in an area not affected by snowfall or
blowing snow. In areas with heavy snow, please install a
canopy, a pedestal and/or some baffle boards.
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 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 bending.
*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) - 5)
*8 Insulation material : Heat resisting foam plastic 0.045
specific gravity
*9 Be sure to use the insulation of specified thickness. Exces-
sive thickness may cause incorrect installation of the indoor
unit and insufficient thickness may cause dew drippage.
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
inlet/outlet side may be exposed directly to wind.
• To prevent exposure to wind, install the outdoor unit
with its air inlet side facing the wall.
• To prevent exposure to wind, it is recommended to install
a baffle board on the air outlet side of the outdoor unit.
Avoid the following places for installation where air condi-
tioner trouble is liable to occur.
• Where flammable gas could leak.
• Where there is much machine oil.
• Salty places such as the seaside.
• Where sulfide gas is generated such as a hot spring.
• Where there is high-frequency or wireless equipment.
Model
Power supply *1
Wire specifications *2
Pipe size
(thickness *3, *4)
Pipe length and height difference
Rated
Voltage
Frequency
Breaker
capacity
Power supply
Indoor/outdoor
connecting wire
Gas
Liquid
Max. pipe
length
Max. height
difference
Max. number
of bends *5, *6
Refrigerant
adjustment A *7
Insulation
thickness *8, *9
MSZ-HC25VA
230 V
50 Hz
10 A
3-core
1.0 mm
2
4-core
1.0 mm
2
ø9.52 mm
(0.8 mm)
ø6.35 mm
(0.8 mm)
10 m
5 m
10
30 g/m
8 mm
MSZ-HC35VA
MSZ-HC35VAB
WARNING
(Could lead to death, serious injury, etc.)
SG79Y763H07
SPLIT-TYPE AIR CONDITIONERS
INSTALLATION MANUAL
ENGLISH
Model names are indicated in 1-3.
