Block Diagram - Hitachi RAS-50WX8 Service Manual

BLOCK DIAGRAM

MODEL RAS-50WX8 / RAC-50WX8
RAS-D18EX3 / RAC-D18EX3
Wireless receive
Wireless remote
circuit
control
Heat exchanger
thermistor
Room temperature
thermistor
Limit switch
Ionizer
Front panel
M
motor
Temporary switch
Initial setting circuit
Reset circuit
Microcomputer clock
circuit
INDOOR UNIT
Buzzer circuit
Filter.
Indicating lamp
Operation.
Timer.
M
Auto sweep motor 2
M
Auto sweep motor 1
C
Indoor / Outdoor
interface circuit
D
DC fan motor drive
circuit
FM
Indoor DC fan motor
OUTDOOR UNIT
L
Magnetic relay
N
Power source
Inrush current
1 φ 50Hz,
Protection circuit
220-230V
DC current signal
Rotor magnetic
pole position
detection circuit
Peak current cut
off circuit
Overload control
circuit
Voltage
amplification
circuit
Over heat thermistor
Defrost thermistor
Outdoor temperature thermistor
C
Indoor / Outdoor
interface circuit
D
DC35V
Reversing valve coil
Power circuit
(Indoor unit)
FM Outdoor DC fan motor
SPM2
ACT
Power module
Power circuit
Trip signal
synthesis circuit
Peak current
cut off
Self-diagnosis circuit
Electric Expansion
valve drive circuit
Clock
circuit
Relay drive circuit
Power circuit
(P.W.B.)
– 53 –
M
DC compressor
motor
Upper arm
drive circuit
Lower arm
drive circuit
Electric
Expansion
valve
M
Reset circuit