Block Diagram - Hitachi RAF-50FX8 Service Manual

BLOCK DIAGRAM

MODEL RAF-50FX8 / RAC-50FX8
Wireless receive
Wireless remote
circuit
control
Humidity sensor
Heat exchanger
thermistor
Room temperature
thermistor
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
M
Suction deflector motor
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 Upper arm
synthesis circuit drive circuit
Peak current
cut off
Lower arm
drive circuit
Self-diagnosis circuit
Electric Expansion
valve drive circuit
Clock
circuit
Relay drive circuit
Power circuit
(P.W.B.)
– 53 –
M
DC compressor
motor
Electric
Expansion
valve
M
Reset circuit