Hitachi RAS-25SX8 - Block Diagram

A
B
C
FM
EEPROM
Dirt sensor
(AX-7Y20)
Ｍ
EEPROM
Relay drive circuit
Latch-type
reversing valve
drive circuit
Electric expansion
valve drive circuit
Electric expansion
valve
Latch-type reversing valve
Outdoor
DC fan motor
Is
Ip
Id
Ip
Id
(AX-8W00)
Ｍ
Ｍ
Ｍ
Ｍ
Ｍ
Ｍ
DC fan motor
drive circuit
Two way valve
drive circuit
Ｍ
Outdoor DC fan motor
drive circuit
DC compressor
motor
Compressor
drive circuit
Power source
1
φ
AC220V-230V
50Hz
Ｍ
– 83 –
BLOCK DIAGRAM
MODEL RAS-25SX8 / RAC-25SX8
RAS-35SX8 / RAC-35SX8
INDOOR UNIT OUTDOOR UNIT
Buzzer circuit
Cleaning unit driving
motor dribe circuit
Indicating lamp
Cleaning unit driving motor
Motor for small vertical vane
Motor for big vertical vane
Motor for left lateral vane
Motor for right lateral vane
Motor for front panel
High-voltage
generating drive
circuit
Ion mist unit
High-voltage
generator electrode
Peltier
Peltier drive
circuit
・Operation.
・Timer.
・Monitoring
・Cleaning
・Mist, air purification
Indoor microcomputer
Stepping motor drive circuit
Outdoor microcomputer
Wireless remote
controller
Wireless receive
circuit
Reset circuit
Control
Power circuit
Room temperature
thermistor
Heat exchanger
thermistor
Oscillator clock
circuit
Front panel
OPEN / CLOSE
Detection switch
Cleaning unit
position detection
switch
Humidity sensor
Indoor / Outdoor
interface circuit
Indoor / Outdoor
interface circuit
PA M
Power circuit
Indoor DC fan motor
Two way valve
Inrush current
Protection circuit
Power relay
Control power circuit
Reset circuit
Overheat thermistor
Defrost thermistor
Outdoor themperature
thermistor
Oscillator clock
circuit