SG79Y952H03
MITSUBISHI
ELECTRIC
SPLIT-TYPE
AIR
CONDITIONERS
INSTALLATION
MANUAL
When
installing
multi
units,
refer
to
the
installation
manual
of
the
multi
unit
for
outdoor
unit
installation.
Model
names
are
indicated
in
1-3.
Required
Tools
for
Installation
Phillips
screwdriver
5/32
in.
(4
mm)
hexagonal
wrench
Level
Flare
tool
for
RA10A
Scale
Gauge
manifold
for
R410A
Utility
knife
or
scissors
Vacuum
pump
for
R410A
2-9/16
in.
(65
mm)
hole
saw
Charge
hose
for
R410A
Torque
wrench
Pipe
cutter
with
reamer
Wrench
(or
spanner)
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.
Please
report
to
your
supply
authority
or
obtain
their
consent
before
connecting
this
equipment
to
the
power
supply
system.
.
.
.
A
WARNING
(Could
lead
to
death,
serious
injury,
etc.)
@
Do
not
install
the
unit
by
yourself
(user).
Incomplete
installation
could
cause
fire
or
electric
shock,
injury
due
to
the
unit
fall-
ing,
or
leakage
of
water.
Consult
the
dealer
from
whom
you
purchased
the
unit
or
a
qualified
installer.
@
Perform
the
installation
securely
referring
to
the
installation
manual.
Incomplete
installation
could
cause
fire
or
electric
shock,
injury
due
to
the
unit
fall-
ing,
or
leakage
of
water.
@ 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.
@
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.
lf
the
capacity
of
the
power
circuit
is
insufficient
or
there
is
incomplete
electrical
work,
it
could
result
in
a
fire
or
an
electric
shock.
@
Ground
the
unit
correctly.
Do
not
connect
the
ground
to
a
gas
pipe,
water
pipe,
lightning
rod
or
telephone
ground.
Defective
grounding
could
cause
electric
shock.
@
Do
not
damage
the
wires
by
applying
excessive
pressure
with
parts
or
screws.
Damaged
wires could
cause
fire.
@
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.
&
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.
@
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
explo-
sion.
@
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
defective
contact,
defective
insula-
tion,
exceeding
the
permissible
current,
etc.
@
Be
sure
to
use
the
parts
provided
or
specified
parts
for
the
installation
work.
The
use
of
defective
parts
could
cause
an
injury
or
leakage
of
water
due
to
a
fire,
an
electric
shock,
the
unit
falling,
etc.
@
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.
lf
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.
#
CAUTION
(Could
lead
to
serious
injury
in
particular
environments
when
operated
incorrectly.)
&
Install
a
Ground
Fault
Interrupt
(GF)
circuit
breaker
depending
on
the instal-
lation
place.
lf
the
Ground
Fault
Interrupt
(GFI)
circuit
breaker
is
not
installed,
it
could
cause
electric
shock.
@
Perform
the
drainage/piping
work
securely
according
to
the
installation
manual.
Hf
there
is
defect
in
the
drainage/piping
work,
water
could
drop
from
the
unit,
soak-
ing
and
damaging
household
goods.
&
Attach
the
electrical
cover
to
the
indoor
unit
and
the
service
panel
to
the
@
The
unit
shall
be
installed
in
accordance
with
national
wiring
regulations.
@
Do
not
touch
the
air
inlet or
the
aluminum
fins
of
the
outdoor
unit.
@
Do
not
install
the
outdoor
unit
where
small
animals
may
live.
outdoor
unit
securely.
If
the
electrical
cover
of
the
indoor
unit
and/or
the
service
panel
of
the
outdoor
unit
are
not
attached
securely,
it
could
result
in
a
fire
or
an
electric
shock
due
to
dust,
water,
etc.
When
installing
or
relocating
the
unit,
make
sure
that
no
substance
other
than
the
specified
refrigerant
(R410A)
enters
the
refrigerant
circuit.
Any
presence
of
foreign
substance
such
as
air
can
cause
abnormal
pressure
rise
or
an
explosion.
Do
not
discharge
the
refrigerant
into
the
atmosphere.
If
refrigerant
leaks
during
installation,
ventilate
the
room.
If
refrigerant
comes
in
contact
with
a
fire,
harmful
gas could
be
generated.
Check
that
the
refrigerant gas
does
not
leak
after
installation
has
been
com-
pleted.
lf
refrigerant
gas
leaks
indoors,
and
comes
into
contact
with
the
flame
of
a
fan
heater,
space
heater,
stove,
etc.,
harmful
substances
will
be
generated.
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.
When
pumping
down
the
refrigerant,
stop
the
compressor
before
discon-
necting
the
refrigerant
pipes.
lf
the
refrigerant
pipes
are
disconnected
while
the
compressor
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.
When
installing
the
unit,
securely
connect
the
refrigerant
pipes
before
start-
ing
the
compressor.
lf
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.
Fasten
a
flare
nut
with
a
torque
wrench
as
specified
in
this
manual.
Hf
fastened
too
tight,
a
flare
nut
may
break
after
a
long
period
and
cause
refrigerant
leakage.
This
could
cause
injury.
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.
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