Hitachi RAS-25WX8 Manuel De Maintenance page 120
Table des Matières
8. Reversing valve control circuit
DC voltmeter
or tester
Reversing valve control circuit will switch reversing valve ON/OFF according to instruction from indoor
microcomputer depending on the operation condition shows in Table 8-1.
Voltage at Q701 (between Collector and Emitter) in each operation condition is approximately as shown
in Table 8-1 when measured by multimeter.
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POWER P.W.B.
Reversing
CN2
valve
2
D701
4
Q701
V
D-0V
O
p
r e
t a
o i
n
c
o
Cooling
General operation of Cooling
In normal heating operation
MAX. rotation speed instructed
Heating
by indoor microcomputer after
defrost is completed
Defrosting
Dehumidifying
Sensor dry
manuals search engine
C-35V
12V
R701
PQ701
CN4B
R705
R706
Fig. 8-1
Table 8-1
n
d
t i
o i
n
– 119 –
MAIN P.W.B.
Microcomputer
CN4A
6
6
24
C
o
e l l
t c
r o
v
l o
a t
g
e
f o
Q
7
0
1
About 0.8V
About 35V
About 35V
About 0.8V
About 0.8V
Table des Matières
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