Reversing Valve Control Circuit - Hitachi RAC-25WPB Service Manual

4.Reversing valve control circuit

This model reversing valve control used to control the relay ON/OFF of the revesing valve, and also control the coil of the
reversing valve ON/OFF.
The relay ON/OFF has different type when in the different operation mode.
You can see each operation mode as fllows. If the reaversing valve not connected or all the condition not the same as follow,
it may be something wrong with the reversing valve circuit.
operation mode
Cooling
Heating
Reversing valve
4
1
Point
28
Usual cooling Hi
Usual heating Lo
Defrost
Hi
SK1
12V
RL3( coil)
HIC 34 pin - 0V
0V
12V
0V
RL3
AC230V
34 11
Fig.4-1
84
CN2 1 - CN2 4
AC230V
0V
AC230V
Control P.W.B
HIC P.W.B
6 28
micon