Block Diagram - Hitachi RAF-25FX8 Service Manual

BLOCK DIAGRAM

MODEL RAF-25FX8 / RAC-25FX8
RAF-35FX8 / RAC-35FX8
Wireless receive
Wireless remote
circuit
control
Humidity sensor
Heat exchanger
thermistor
Room temperature
thermistor
Temporary switch
Initial setting circuit
Reset circuit
Microcomputer clock
circuit
INDOOR UNIT
Buzzer circuit
Filter.
Indicating lamp
Operation.
Timer.
M
Auto sweep motor 2
M
Auto sweep motor 1
M
Suction deflector motor
C C
Indoor / Outdoor
interface circuit
D D
DC fan motor drive
circuit
FM
Indoor DC fan motor
OUTDOOR UNIT
POWER RELAY
RECTIFIER
Inrush current
Protection circuit
Rotor magnetic
pole position
detection circuit
lp
ld
ls
Overheat thermistor
Defrost thermistor
Outdoor temperature thermistor
Indoor/Outdoor
interface circuit
Power circuit
Outdoor DC fan motor
HARMONICS
IPM
IMPROVEMENT
CIRCUIT
Relay drive circuit
Electric expansion valve
Reversing valve
control circuit
Reset
circuit
– 53 –
DC compressor
motor
Reversing valve coil