Hitachi RAK-35NH5 - Circuit Diagram

Fig. 2-1 Interface circuit
CN3 Black
0V
DC35V
Approx. 1V
Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4
In/out Connecting cable
Terminal board
Brown
Interface relay 1
I/F transformer 1 I/F transformer 2
Interface relay 2
Red Blue Yellow
Terminal board
SW - D -P .W .B.
35V-B output
35V-A output
Control P.W.B.
B cycle switching power supply circuit for indoor unit 3 and 4 35VÐB BEN12VÐB BEN5VÐB
A cycle switching power supply circuit for indoor unit 1 and 2 35VÐA BEN12VÐA BEN5VÐA
f=approx. 38 kHz oscillator circuit f=approx. 38 kHz oscillator circuit
f=approx. 38 kHz
f=approx. 38 kHz
Sending
Receiving
Demodulation circuit
1 frame 33 msec.
Micro computer
(for A cycle)
Sending
Receiving
Demodulation circuit
Modulation circuit Modulation circuit
Micro computer
(for B cycle)
I/F transformer 3 I/F transformer 4
Interface relay 1 Interface relay 2
Green 1
Brown (striped) Red (striped) Blue (striped) Yellow (striped)
CN8 White
CN2 White
NF COIL 8
NF COIL 7 NF COIL 6 NF COIL 5
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