Hitachi RAS-50YH4 - Block Diagram

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Wireless receive
circuit
Filter.
Operation.
Timer.
Auto sweep motor for
Air deflector
LCD wireless
Heat exchanger
thermistor
Room temperature
thermistor
Reset circuit
Initial setting circuit
Temporary switch
Electric Expansion valve
drive circuit
Electric
Expansion
valve
Outdoor microcomputer / HIC (AX-8N00)
Trip signal
synthesis circuit
L
N
RAS-50YH4 / RAC-50YH4
SPM2
Power source
1ø, 50Hz, 230V
Outdoor
unit
Terminal
board
Indoor microcomputer (AX-7R11)