Hitachi RAC-25WPE - Block Diagram

BLOCK DIAGRAM
MODEL RAC-18/25/35/4 2/50WPE
1
2
3
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-16G814)
series
Outdoor DC fan motor
drive circuit
Compressor
motor
Compressor
drive circuit
OUTDOOR UNIT
Power source
Outdoor microcomputer
Indoor / Outdoor
interface circuit
Power circuit
Control power circuit
Reset circuit
Overheat thermistor
Defrost thermistor
Outdoor temperature
thermistor
Oscillator clock
circuit
L
N
Indoor
unit
16