Hitachi RAS-10SH3 - Block Diagram

A
B
C
FM
EEPROM
Infrared Sensor
(AX-7Z 1 )
Ｍ
EEPROM
Relay drive circuit
Latch-type
reversing valve
drive circuit
Electric expansion
valve drive circuit
Electric expansion
valve
Latch-type reversing valve
Outdoor
Fan motor
Is
Ip
Id
Ip
Id
(AX-8Y30)
Ｍ
Ｍ
Ｍ
Ｍ
DC fan motor
drive circuit
Two way valve
drive circuit
Ｍ
Outdoor DC fan motor
drive circuit
Compressor
motor
Compressor
drive circuit
Power source
1
φ
AC220V
50Hz
Ｍ
– 6 5 –
BLOCK DIAGRAM
MODEL RAS-10SH3 / RAC-10SH3
RAS-14SH3 / RAC-14SH3
RAS-18SH3 / RAC-18SH3
INDOOR UNIT
OUTDOOR UNIT
Buzzer circuit
Cleaning unit driving
motor drive circuit
Indicating lamp
Cleaning unit driving motor
Motor for vertical vane
Motor for lateral vane(left)
Motor for lateral vane(right)
High-voltage
generating drive
circuit
High-voltage
generator electrode
·Operation.
·Timer.
·Monitoring
·Cleaning
·Sensor
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
Cleaning unit
position detection
switch
Humidity sensor
Indoor / Outdoor
interface circuit
Indoor / Outdoor
interface circuit
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 temperature
thermistor
Oscillator clock
circuit
4