Hitachi RAC-25FPA, Service Manual

Page: 25 / 117

– 36 –
ENGLISH DEUTSCH FRANÇAIS ITALIANO SPANISH PORTUGUÊS
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REGULAR INSPECTION
PLEASE CHECK
THE FOLLO
WING POINTS EVER
Y EITHER HALF
YEARL
Y OR
YEARL
Y
. CONT
A
CT
Y
OUR
SALES A
GENT SHOULD
Y
OU NEED ANY HELP
.
1 2
Chec
k to see if the unit’
s ear
th line has been connected
correctl
y.
If the ear
th line is disconnected or f
aulty
, unit f
ailure or electr
ic
shock hazard may result. Check to see if the mounting frame has rusted excessively or if the outdoor unit has tilted or become unstable. It could collapse or f
all, causing injur
y.
WHEN ASKING FOR SER
VICE,
CHECK
THE FOLLO
WING
S
T
NI
O
P
G
NI
W
O
L
L
O
F
E
H
T
K
C
E
H
C
N
OI
TI
D
N
O
C
s
Do the batteries need replacement?
s
Is the polarity of the inserted batteries correct?
s
Is the air filter blocked with dust?
s
Is the set temperature suitable?
s
Have the top and bottom 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 blocked?
s
Is the fan speed “LOW” or “SILENT”?
WARNING
W
ARNING
AFTER SALES SERVICE AND W
ARRANTY
s
Is the fuse all right?
s
Is the voltage extremely high or low?
s
Is the circuit breaker “ON”?
s
Is 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. The following phenomena do not indicate unit failure.
<Operation start> The unit is preparing to blow warm air. Please wait. <In operation> The outdoor unit is defrosting. Please wait.
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’s rpm changing such as operation start times.
.
n
o
d
e
hc
ti
ws
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e
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n
e
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evl
av
d
ezi
r
ot
o
m
e
ht
f
o
esi
o
N
esi
o
n
g
ni
kci
l
C 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.
Changing operation noise
Operation noise changes due to power variations according to room temperature changes.
.ri
a
d
e
n
oiti
d
n
oc
y
b
d
el
o
oc
yl
n
e
d
d
us
si
m
o
or
e
ht
ni
hti
w r
i
a
e
ht
s
a
d
et
ar
e
n
e
g
si
tsi
M
n
oi
ssi
m
e t
si
M During heating, the operation indicator blinks and air blow stops
If the remote controller is not transmitting a signal.
(Remote controller display is dim or blank.)
–35 –
Heating Capability
s
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’s heating capability
from decreasing.
If the unit’s heating
performance is still unsatisfactory, other heating appliances should be used to augment this unit’s performance.
s
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.
Cooling and Dehumidifying Capabilities
s
If the heat present in a room exceeds the unit’s 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.
INFORMA
TION
CAPABILITIES
CAUTION
Do not use a stove or any other high- temperature devices in proximity to the indoor unit.
s
When fan speed, room temperature are set with the remote controller before starting manual operation and the b
uttons are released, the indication of settings will go off in 10 seconds and only the operation mode will
be displayed.
s
Pressing the
button while the unit is in operation will let the protective circuit work so that the unit will
not operate for approximately 3 minutes.
s
Dur
ing heating operation, the indoor unit’
s color indicator lamp ma
y flash with no air emitted f
or a while.
s
If you feel cold wind during warming operation with t
h
e
(HI) fan speed or want to make the unit operation
quieter after the room is heated, use of
(A
UT
O) setting is recommended.
s
With the
(SILENT) setting, the unit’
s cooling capability will lo
w
er slightly
.
VARIOUS FUNCTIONS
s
When the timer has been programmed, the unit will not operate even 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.
s
If the
s
Dur
ing sleep timer operation, the f
an speed sets to
(SILENT) regardless of the preset speed.
The remote
controller display indication will remain unchanged even with the
(SILENT) setting.
TIMER PROGRAMMING/SLEEP TIMER OPERATION
PROHIBITION
b
utton is pressed while the ON/OFF timer is prog
rammed, the sleep timer tak
es pr
iority
.
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