Hitachi RAC-18WSPA, Service Manual

Page: 11 / 101

INFORMA
TION
CAP
ABILITIES
Heating Capability
This room air conditioner utiliz
es a heat pump system that absorbs
e
xter
ior heat and br
ings it into a room to be heated.
As the ambient
temper
ature gets lo
wer
, heating capability will also lo
wer
. In such a
situation, the inverter work to increase compressor rpm to keep the unit’
s heating capability from decreasing.
If the unit’
s heating perf
or-
mance is still unsatisf
actor
y,
other heating appliances should be used
to augment this unit’
s perf
or
mance
.
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 f
or eff
ectiv
e preheating ahead of the desired time
.
Cooling and Dehumidifying Capabilities
If the heat present in a room e
xceeds the unit’
s cooling capacity (f
or e
xample
, if there are man
y people in
the room or other heating appliances are used), the preset room temper
ature ma
y not be reached.
CA
UTION
Do not use a sto
v
e
or an
y other
hightemper
ature
de
vices in pro
ximity
to the indoor unit.
PROHIBITION
– 8 –
When lightning occurs
Warning
To protect the whole unit during lightning please stop operating the unit and turn off the circuit breaker.
!
þPGGÿ
REGULAR INSPECTION
PLEASE CHECK
THE FOLLO
WING POINTS EVER
Y EITHER HALF
YEARL
Y OR
YEAR
LY
. CONT
A
C
T
Y
OUR SALES A
GENT SHOULD
Y
OU NEED ANY HELP
.
1 2 3
W
ARNING
W
ARNING
Chec
k to see if the unit’
s ear
th line has been con-
nected correctl
y
.
If the ear
th line is disconnected or f
aulty
, unit f
ailure or
electr
ic shoc
k hazard ma
y result.
Chec
k to see if the mounting frame has rusted e
x
-
cessivel
y or if the outdoor unit has tilted or become
unstab
le
.
It could collapse or f
all, causing injur
y.
WHEN ASKING FOR SER
VICE,
CHECK
THE FOLLO
WING POINTS.
CONDITION
CHECK
THE FOLLO
WING POINTS
s
Do the batter
ies need replacement?
s
Is the polar
ity of the inser
ted batter
ies correct?
s
Is the fuse all r
ight?
s
Is the v
oltage e
xtremely high or lo
w?
s
Is the circuit breaker “ON”?
s
Is the power plug inserted?
s
Do y
ou ha
v
e
an
y po
w
er cut?
s
Is the air filter b
loc
k
ed with dust?
s
Is the set temper
ature suitab
le?
s
Have horizontal air deflectors been adjusted to their correct positions according to the operation mode selected?
s
Are the air inlets or air outlets of indoor and outdoor units b
loc
k
ed?
s
Is the f
an speed
“LO
W”or
“SILENT”?
When it does not oper
ate
.
When it does not cool w
ell.
When it does not heat well. If the remote controller is not tr
ansmitting a signal.
(Remote controller displa
y is
dim or b
lank.)
The f
ollo
wing phenomena do not indicate unit f
ailure
.
<Operation start> The unit is prepar
ing to b
lo
w
w
a
rm
air
. Please w
ait.
<In operation> The outdoor unit is defrosting. Please wait. Refrigerant flow noise in the pipe or valve sound generated when flow rate is adjusted. Noise generated when the unit expands or contracts due to temperature changes. Noise gener
ated with the indoor unit f
a
n
’s r
pm changing such as oper
ation star
t
times. Noise of the motorized valve when the unit is switched on.
Dur
ing heating, the oper
ation
indicator b
links and air b
lo
w
stops
Hissing or fizzy sounds Squeaking noise Rustling noise
W
ARNING
Clicking noise
Chec
k to see if the po
wer plug is securel
y inser
ted
into the wall soc
ket.
If the power plug is not inserted into the wall socket securely or becomes hot, an electric shock or fire may result. If dust or dirt is found on the power plug, clean the plug and insert it into the wall socket.
AFTER SALES SERVICE AND WARRANTY
ENGLISH
– 9 –