Hitachi RAC-18YH4, Service Manual

Page: 15 / 99

– 13 –
– 22 –
CAP
ABILITIES
Heating Capability •
This room air conditioner utilizes
a heat pump system that absorbs
ex
ter
ior heat and br
ings it into a room to be heated.
As the ambient
temperature
gets lo
w
e
r,
heating capability will also lo
w
e
r.
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
o
rmance
.
•
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
fo
r eff
ectiv
e preheating ahead of the desired tim
e
.
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 temperature ma
y not be reached.
CA
UTION
Do not use a sto
v
e
or an
y other
hightemperature de
vices in pro
x
imity
to the indoor unit.
•
When f
an speed, room temperature
are set with the remote controller bef
ore star
ting manual
operation
and
the b
u
ttons are released, the indication of settings will go off in 10 seconds and only the operation mode
will be displa
y
ed.
•P
ressing the
bu
tton while the unit is in operation
will let the protectiv
e circuit w
o
rk
so that the unit will
not operate
fo
r appro
x
imately 3 min
u
tes
.
•
Dur
ing heating oper
ation, the indoor unit’
s color indicator lamp ma
y flash with no air emitted
fo
r a while
.
•
If y
ou f
eel cold wind dur
ing heating operation with the
(HI) f
an speed or w
ant to mak
e the unit oper
ation
quieter after the room is heated, use of
(A
UT
O) setting is recommended.
•W
ith the
(L
O
W
) setting, the unit’
s cooling capability will lo
wer
slightly
.
•W
ith the
(LO
W
) setting, the unit’
s heating capacity will v
a
ry
with the operating conditions
.
V
ARIOUS FUNCTIONS
•
When the timer has been progr
ammed, the unit will not operate
e
v
en if the set time is reached unless th
e
unit receiv
es a signal from the remote controlle
r.
Confir
m that timer programming is complete (beep) and
the
TIMER lamp of the indoor unit lights
.
•
If the
(SLEEP) b
utton is pressed while the ON/OFF timer is progr
ammed, the sleep timer tak
es pr
ior
ity
.
•
Dur
ing sleep timer operation,
the f
an speed sets to
(LO
W
) regardless of the preset speed.
The remote
controller displa
y
indication will remain unchanged e
v
en with the
(LO
W) setting.
TIMER PR
OGRAMMING/SLEEP
TIMER OPERA
TION
PROHIBITION
INFORMATION
– 23 –
REGULAR INSPECTION
PLEASE CHECK
THE FOLLO
WING POINTS EVER
Y EITHER HALF
YEARL
Y
OR
YEARL
Y
. CONT
A
C
T
Y
OUR SALES A
G
ENT 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
a
ulty
, 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
a
ll, causing injur
y.
WHEN ASKING FOR SER
VICE,
CHECK
THE FOLLO
WING POINTS.
CONDITION
CHECK
THE FOLLO
WING POINTS
•D
o the batter
ies need replacement?
•
Is the polar
ity of the inser
ted batter
ies correct?
•
Is the fuse all r
ight?
•
Is the v
o
ltage e
xtremely high or lo
w?
•
Is the circuit breaker “ON”?
•
Is the power plug inserted?
•D
o y
o
u ha
v
e
an
y po
wer cut?
•
Is the air filter b
loc
k
ed with dust?
•
Is the set temper
ature suitab
le?
•H
ave horizontal 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 bl
o
c
k
ed?
•
Is the f
an speed
“LO
W”?
When it does not oper
ate.
When it does not cool well. 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
o
llo
w
ing phenomena do not indicate unit f
a
ilure
.
<Operation start> The unit is prepar
ing to b
lo
w
w
a
rm
air
. Please w
a
it.
<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 operatio
n
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 inse
rt
ed
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