Hitachi RAD-25NH5, Service Manual, Page: 68 / 371

Ð 0209 Ð
Ð1
8Ð
¥
This
room
air
conditioner
utilizes
a
heat
pump
system
that
absorbs
exterior
heat
and
brings
it
into
a
room
to
be
heated.
As
the
ambient
temperature
gets
lower,heating
capability
will
also
lower.
In
such
a
situation,the
PAM
and
inverter
work
to
increase
compressor
rpm
to
keep
the
unit
Õs
heating
capability
from
decreasing.
If
the
unit
Õs
heating
performance
is
still
unsatisfactory,other
heating
appliances
should
be
used
to
augment
this
unit
Õs
performance.
¥
The
air
conditioner
is
designed
to
heat
an
entire
room
so
that
it
may
take
some
time
before
you
feel
warm.
Timer
operation
is
recommended
for
effective
preheating
ahead
of
the
desired
time.
¥I
fthe
heat
present
in
a
room
exceeds
the
unit
Õs
cooling
capacity
(for
example,if
there
are
many
people
in
the
room
or
other
heating
appliances
are
used),the
preset
room
temperature
may
not
be
reached.
!
"
Do
not
use
a
stove
or
any
other
high-
temperature
devices
in
proximity
to
the
indoor
unit.
PROHIBITION
¥
When
fa
n
speed,room
temper
ature
are
set
with
the
remote
controller
bef
ore
star
ting
man
ual
oper
ation
and
the
buttons
are
released,the
indication
of
settings
will
go
off
in
10
seconds
and
only
the
oper
ation
mode
will
be
displa
yed.
¥
Pressing
the
button
while
the
unit
is
in
oper
ation
will
let
the
protectiv
e
circuit
w
or
k
so
that
the
unit
will
not
oper
ate
fo
rappro
ximately
3
min
utes
.
¥I
fy
ou
feel
cold
wind
during
w
ar
ming
operation
with
th
e
(HI)
fa
n
speed
or
w
ant
to
mak
e
the
unit
operation
quieter
after
the
room
is
heated,use
of
(A
UT
O)
setting
is
recommended.
¥
With
the
(LO
W)
setting,the
unit
Õs
cooling
capability
will
lo
w
er
slightly
.
# "
"
¥
When
the
timer
has
been
prog
rammed,the
unit
will
not
oper
ate
ev
en
if
the
set
time
is
reached
unless
the
unit
receiv
es
a
signal
from
the
remote
controller
.Confir
m
that
timer
prog
ramming
is
complete
(beep)
and
the
TIMER
lamp
of
the
indoor
unit
lights
.
¥I
fthe
(SLEEP)
button
is
pressed
while
the
ON/OFF
timer
is
prog
rammed,the
sleep
timer
tak
es
pr
ior
ity
.
¥
Dur
ing
sleep
timer
oper
ation,the
fa
n
speed
sets
to
(LO
W)
regardless
of
the
preset
speed.
The
remote
controller
displa
y
indication
will
remain
unchanged
ev
en
with
the
(LO
W)
setting.
!
$ !!$%
!
Ð1
9Ð
$
1 2
&
'
(
)
&&
&))&
*
If
the
ear
th
line
is
disconnected
or
faulty
,unit
failure
or
electric
shoc
k
hazard
ma
y
result.
&
'
)
)
+&,
)
)
)
&
*
It
could
collapse
or
fall,causing
injur
y.
-
.$
#/
.
-$
*
.
-$
¥D
o
the
batteries
need
replacement?
¥I
s
the
polarity
of
the
inserted
batteries
correct?
¥I
s
the
air
filter
blocked
with
dust?
¥I
s
the
set
temperature
suitable?
¥
Have
the
top
and
bottom
air
deflectors
been
adjusted
to
their
correct
positions
according
to
the
operation
mode
selected?
¥
Are
the
air
inlets
or
air
outlets
of
indoor
and
outdoor
units
blocked?
¥I
s
the
fan
speed
ÒLOWÓ?
- $
-
$
#
- 0
¥I
s
the
fuse
all
right?
¥I
s
the
voltage
extremely
high
or
low?
¥I
s
the
circuit
breaker
ÒONÓ?
¥I
s
the
setting
of
operation
mode
different
from
other
indoor
units?
When
it
does
not
operate.
When
it
does
not
cool
well.
When
it
does
not
heat
well.
If
the
remote
controller
is
not
transmitting
a
signal.
(Remote
controller
display
is
dim
or
blank.)
$"
PLEASE
CHECK
THE
FOLLO
WING
POINTS
EVER
Y
EITHER
HALF
YEARL
Y
O
R
YEARL
Y.
CONT
AC
T
YOUR
SALES
AGENT
SHOULD
YO
U
NEED
ANY
HELP
.
The
follo
wing
phenomena
do
not
indicate
unit
failure
.
Hissing
or
fizzy
sounds
Refrigerant
flow
noise
in
the
pipe
or
valve
sound
generated
when
flow
rate
is
adjusted.
Squeaking
noise
Noise
generated
when
the
unit
expands
or
contracts
due
to
temperature
changes.
Rustling
noise
Noise
generated
with
the
indoor
unit
fan
Õs
rpm
changing
such
as
operation
start
times.
Clicking
noise
Noise
of
the
motorized
valve
when
the
unit
is
switched
on.
Changing
operation
noise
Operation
noise
changes
due
to
power
variations
according
to
room
temperature
changes.
Mist
emission
Mist
is
generated
as
the
air
within
the
room
is
suddenly
cooled
by
conditioned
air.
Steam
emitted
from
the
outdoor
unit
Water
generated
during
defrosting
operation
evaporates
and
steam
is
emitted.
Odors
Caused
as
the
smells
and
particles
of
smoke,food,cosmetics,etc.
present
in
room
air
become
attached
the
unit
and
blown
off
into
the
room
again.
Perking
noise
Noise
of
the
ventilation
fan
sucking
in
air
present
in
the
drain
hose
and
blowing
out
dehumidifying
water
that
had
accumulated
in
the
condensed
water
collector.
For
details,consult
your
sales
agent.
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