
– 56 –
1
CN2
3
2
D701
32
29
C
35V
D
0V
12V
16
1
IC2
6-5. Reversing valve control circuit
In this unit, reversing valve control circuit turns ON/OFF the power to the reversing valve coil by
opening/closing the reversing valve relay.
Opening/closing of relay will differ depending on the operation condition. (In the cooling cycle,
reversing valve relay is normally ON (close).)
Table 6-3 shows the circuit operation of each operation mode. If the following result is not obtained,
reversing valve control circuit may be defective.
Table 6-3
Point
Operation mode
Cooling
In normal cooling operation
In normal heating operation
In defrosting operation
approx. 35 V
approx. 35 V
0V
Hi
0V
Hi
12V
Lo
0V (not fixed)
Heating
Between Pin 29
of microcomputer and 0V
Between Pin 32 of HIC
and 0V
Between 1 and 3 CN2
Main P.W.B.
Reversing
valve
Reversing valve
relay coil
(RL5)
HIC
Fig. 6-13
Microcomputer
Reversing valve relay
RL5
−
−
Summary of Contents for RAC-E08H2
Page 17: ... 15 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS E08H2A RAS E10H2A INDOOR UNIT Unit mm ...
Page 18: ... 16 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC E08H2 RAC E10H2 OUTDOOR UNIT ...
Page 22: ... 20 CIRCUIT DIAGRAM MODEL RAS E08H2A RAS E10H2A ...
Page 23: ... 21 RAC E08H2 RAC E10H2 MODEL ...
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Page 92: ... 90 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAS E08H2A RAS E10H2A ...
Page 94: ...THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA ...
Page 95: ...HITACHI RAS E08H2A RAC E08H2 RAS E10H2A RAC E10H2 SM0026 ...