Block Diagram - Hitachi RAC-18WED Service Manual

BLOCK DIAGRAM

MODEL RAK-18/25/35/50PED
RAK-25/35/50PEDC
Control
Power circuit
Reset circuit
Wireless receive
Wireless remote
/send circuit
controller
Room temperature
thermistor
Heat exchanger
thermistor
EEPROM
Oscillator clock
circuit
INDOOR UNIT
Indoor / Outdoor
interface circuit
DC fan motor
Indoor DC fan motor
drive circuit
Operation
Indicating lamp
Timer
Buzzer circuit
Vertical sweep motor
(AX-13D722)
Power source OUTDOOR UNIT
1 O 230V 50Hz
L
N
1
2
Indoor / Outdoor
interface circuit
3
Is
Overheat thermistor
Defrost thermistor
Outdoor temperature
thermistor
EEPROM
Oscillator clock
circuit
30
Compressor
Power circuit
drive circuit
Control power circuit
Outdoor DC fan motor
Reset circuit drive circuit
Ip
Id
Ip
Id
Reversing valve
drive circuit
Relay drive circuit
(AX-16 G 810)
Electric expansion
valve drive circuit
Compressor
motor
Outdoor
Fan motor
Reversing valve
Electric expansion
valve