Hitachi RAK-25PEB - SYSTEM BLOCK DIAGRAM; Indoor and Outdoor Unit Interaction

1
2
3
EEPROM
AX-13D720)(
EEPROM
Relay drive circuit
Reversing valve
drive circuit
Electric expansion
valve drive circuit
Electric expansion
valve
Reversing valve
Outdoor
Fan motor
Is
Ip
Id
Ip
Id
(AX-12C870)
DC fan motor
drive circuit
Outdoor DC fan motor
drive circuit
Compressor
motor
Compressor
drive circuit
BLOCK DIAGRAM
INDOOR UNIT
OUTDOOR UNITPower source
1 O 230V 50Hz
Buzzer circuit
Indicating lamp
Vertical sweep motor
Horizontal sweep motor
Operation
Timer
Indoor microcomputer
Stepping motor drive circuit
Outdoor microcomputer
Wireless remote
controller
Wireless receive
Reset circuit
Control
Power circuit
Room temperature
thermistor
Heat exchanger
thermistor
Oscillator clock
circuit
Indoor / Outdoor
interface circuit
Indoor / Outdoor
interface circuit
Power circuit
Indoor DC fan motor
Control power circuit
Reset circuit
Overheat thermistor
Defrost thermistor
Outdoor temperature
thermistor
Oscillator clock
circuit
MODEL RAK-18/25/35/50PEB
L
N
/send circuit
RAK-25/35/50PEBC
27