Block Diagram - Hitachi RAS-20CNHZ2 Service Manual

BLOCK DIAGRAM

INDOOR
MODEL RAS-20CNHZ2
Wireless receive
LCD wireless
circuit
Buzzer circuit
Room temperature
thermistor
Indicating lamp
M
Heat exchanger
temperature
thermistor
Indoor / Outdoor
Temporary switch /
interface circuit
Auto Restart
Initial setting
DC fan motor
circuit
drive circuit
Reset circuit
Micro computer
clock circuit
MODEL RAS-30CNHZ2
Wireless receive
LCD wireless
circuit
Buzzer circuit
Room temperature
thermistor
Indicating lamp
M
Heat exchanger
temperature
thermistor
Auto-restart
Indoor / Outdoor
interface circuit
Temporary switch
Initial setting
DC fan motor
circuit
drive circuit
Reset circuit
Micro computer
clock circuit
Operation.
Timer.
Indoor Unit 1
Auto sweep motor for
Air deflector
Terminal
Board
C
D
FM
Indoor fan motor
Operation.
Timer.
Dehumidifying.
Indoor Unit 2
Auto sweep motor for
Air deflector
Terminal
Board
C
D
FM
Indoor fan motor
OUTDOOR
MODEL RAM-50CNHZ2
Power source1 ¿50Hz, 220-240V
L
Magnetic relay
N
Inrush current
Protection circuit
C
D
Rotor pole position
desition detector
Peak current cut off
circuit
Overload external
judgement circuit
Voltage amplification
circuit
Over heat thermistor
Defrost thermistor
Outdoor temperature thermistor
Indoor / Outdoor
interface circuit 1
C
Indoor / Outdoor
interface circuit 2
D
Reversing valve coil
DC35V
FM
Outdoor fan motor
PAM Power
Power module
circuit
Peak current
cut off
Clock
circuit
Power circuit
(For Indoor 2 P.W.B)
Power circuit
(Indoor and outdoor P.W.B)
M
DC compressor
motor
M
Electric
expansion valve
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