Hitachi RAC-10SH3, Service Manual, Page: 134 / 153

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Checking the electrical parts of the outdoor unit
After tur
ning on the po
w
er
, perf
or
m air pur
ification b
y remote control.
※
Immediately after po
w
er-on, the oper
ation rela
y of the indoor unit is not tur
ned on.
The outdoor unit will theref
ore not be po
w
ered.
Is the LD301 tur
ned on?
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
No
No
No
Is there 220V A
C betw
een
ter
minal boards A and B?
Ensure that the F cab
le is
correctly connected.
Abnor
mal
Abnor
mal
Abnor
mal
Abnor
mal
Abnor
mal
Correct the F cab
le connection.
Nor
mal
Nor
mal
Break
er activ
ated
Break
er nor
mal
Has the break
er not been activ
ated?
Chec
k f
or electr
ical leakage
. After that,
tur
n on the break
er and mak
e a doub
le
-chec
k.
Is the 25 A fuse nor
mal?
If the 25 A fuse is b
lo
wn out, it ma
y
ha
ve caused another par
t to go out
of order
. Please tak
e care
. (The
main par
ts which ma
y be in such a
state are the v
ar
istor
, diode stac
k,
IPM and smoothing capacitor
.)
Replace the outdoor electr
ical par
ts
.
Is there a v
oltage of 264-358V DC? F
or the
measur
ing points
, see the instr
uction plate
on the lid of the electr
ical par
ts
.
Chec
k the connection of the reactor line
and f
or wire breaks in the reactor
.
Correct the connection of the reactor line or replace the reactor
.
Replace the outdoor electr
ical par
ts
(in the case of an abnor
mality in the diode
stac
k or smoothing capacitor).
Is the po
w
er circuit nor
mal? F
or details
, see
the page on the po
w
er circuit.
Is the F4 (2 A fuse) bl
ow
n out?
Replace the outdoor electr
ical par
ts (in the case of
an abnor
mality in the po
w
er circuit).
Chec
k the outdoor f
an motor
. (F
or
details
, see the page on the outdoor f
an
motor or the instr
uction plate on the lid of
the electr
ical par
ts
.)
Outdoor f
an
motor nor
mal
Replace the outdoor electr
ical par
ts alone (in the
case of an abnor
mality in the po
w
er circuit or f
an
motor dr
iv
e circuit).
Abnor
mality in the outdoor f
an motor
Just in case
, tur
n the po
w
er bac
k on
and perf
or
m air pur
ification.
The LD301 will not go on and the po
w
er circuit is nor
mal.
Replace the outdoor electr
ical par
ts
(in the case of an abnor
mality in the
microcomputer or LED). Replace the outdoor electr
ical par
ts and outdoor
fan motor (in the case of an abnor
mality in the f
an motor
and f
an motor dr
iv
e circuit).
Chec
k the indoor electr
ical par
ts
. (It ma
y
ha
ve a po
w
er rela
y abnor
mality
, comm
unication
error or something similar
.)