Hitachi RAS-E10H2 - OUTDOOR UNIT SPECIAL OPERATION MODES; Operating Outdoor Unit via Service Switch; Independent Outdoor Unit Operation

1. Troubleshooting procedure (No operation, No heating, No cooling)
Connect U,V,W phase leads to the
power module again and operate the
air conditioner.
Gas leaks.
Repair and seal refr
igerant.
Is the self-diagnosis lamp mode as
shown on the r
ight?
YES
Error (Gas leaking)
Normal
Perform a final check of operation.
When the
self-diagnosis lam
p
lights in the sam
e
condition as above
.
The compressor is defective. Replace it
and seal refrigerant.
If the compressor chec
ker for an
inve
rter type air conditioner is
available, re-check using it.
( )
(JUDGING BETWEEN GAS LEAKAGE AND
COMPRESSOR DEFECTIVE)
Blinking off
Time until the
lamp lights
Approx. 10 seconds
Approx.
10
seconds
Approx.
10
seconds
Within
Appro
x.
30
seconds
Compressor
Compressor
Gas
leakage
Possible
malfunctioning
par
t
LD301
Self-
diagnosis lam
p
Lighting mode
Blinks
2 times
Blinks
3 times
Blinks
4 times
Blinks
5 times
Blinks
6 times
Blinks
8times
Stop to operate and check the gas
pressure in balancing mode
.
Checking the IPM (main P.W.B.)
(R410 A)
The values above are the theoretical ones.
CHECKING THE REFRIGERATING CYCLE
MODEL RA
C-E10H2
1.
T
ur
Tur T
n off the po
w
er
sw
itch.
2.
Remo
ve
the elect
ri
cal bo
x co
ve
r.
3.
T
ur
Tur T
n on the po
w
er
sw
itc
h
4.
After
wa
iting f
or 30 seconds
, push the ser
vice s
witch
fo
r a second.
LD303 (red) will light and the unit will operate in the forced cooling mode at this time.
Ne
ve
r
operate
the
unit
fo
r
more than 5 minites
.
(Cautions)
(1
)
If
interf
ace
signal
(DC
35V)
te
rm
inals
C
and
D
are
not
connected
when
the
outdoor
unit
is
in
fo
rced
cool
mode
,
the outdoor unit def
ect indicator (LD301) will b
link 9 times dur
ing operation to indicate communication erro
r.
(2)
If
chec
king
is
done
with
the
compressor
connector
disconnected,
the
unit
will
stop
and
LD301
will
b
link
4
times
.
Be sure to push the ser
vice
sw
itch
fo
r a second again to stop the
fo
rced cool operation.
1.
Connect the large dia.
pipe side and small dia.
pipe side ser
vice v
alv
e using a pipe
.
Pa
rt
s to be prepared
(1) Reducing union
2/8” (6.35 mm)
3/8” (9.52 mm)
(2) Copper pipe (2/8” and 3/8”
)
Connect
the
small
diameter
ser
vice
va
lue
and
the
large
diameter
ser
vice
va
l
ve
using
the
reducing
union
and
copper pipe as sho
wn on the
ri
ght
.
Charge ref
ri
gerant of 300g
The operation method is the same as
“H
ow
to operate using the connector to ser
vicing the outdoor unit”
.
Do not operate for more than 5
minutes
Large dia. service valve
Reducing union
(2/8” and 3/8”)
Copper pipe
(2/8”)
Small diameter
service valve
Re
versing
va
lve
Compressor
Outdoor unit
HOW
TO
OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT
TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNITTO
HOW
TO
OPERATE THE OUTDOOR UNIT INDEPENDENTLY
TO OPERATE THE OUTDOOR UNIT INDEPENDENTLYTO
after vacuuming ( 1)
after vacuuming ( 1)
1 The charging amount of 200g is equivalent to the load in normal operation.
Ｌ
Ｄ
３
０
３
Ｌ
Ｄ
３
０
２
Ｌ
Ｄ
３
０
１
Service switch
LD303
LD302
LD30
1
MAIN
P.
W
.B.
SER
VICE SWITC
H
HI
C
- 91
-