Block Diagram - Hitachi RAC-18SX8 Service Manual

BLOCK DIAGRAM

MODEL RAS-18SX8 / RAC-18SX8
Power source
1 φ AC220V-230V
50Hz
Control
Power circuit
Reset circuit
Wireless remote Wireless receive
controller circuit
Room temperature
thermistor
Heat exchanger
thermistor
Humidity sensor
Dirt sensor
EEPROM
Oscillator clock
circuit
Front panel
OPEN / CLOSE
Detection switch
Cleaning unit
position detection
switch
INDOOR UNIT
Inrush current
Protection circuit
Power relay
Indoor / Outdoor
interface circuit
DC fan motor
FM
Indoor DC fan motor
drive circuit
Two way valve
Two way valve
drive circuit
・ Operation.
Indicating lamp ・ Timer.
・ Monitoring
・ Cleaning
Buzzer circuit ・ Mist, air purification
Cleaning unit driving
motor dribe circuit
Cleaning unit driving motor
Ｍ
Motor for small vertical vane
Ｍ
Motor for big vertical vane
Ｍ
Motor for left lateral vane
Ｍ
Motor for right lateral vane
(AX-7Y20)
Ｍ
Motor for front panel
Ion mist unit
High-voltage
generating drive
High-voltage
circuit
generator electrode
Peltier drive
circuit
OUTDOOR UNIT
A
B
Indoor / Outdoor
interface circuit
C
Overheat thermistor
Ｍ Defrost thermistor
Outdoor themperature
thermistor
EEPROM
Oscillator clock
circuit
Peltier
PAM
Compressor
Power circuit
drive circuit
Control power circuit
Reset circuit
Ip
Is
Id
Ip
Id
Latch-type
reversing valve
drive circuit
Relay drive circuit
(AX-8W00)
Electric expansion
valve drive circuit
– 83 –
Ｍ
DC compressor
motor
Outdoor DC fan motor
drive circuit
Ｍ
Outdoor
DC fan motor
Latch-type reversing valve
Ｍ
Electric expansion
valve