Hitachi RAK-25NH6 - 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-6M01)
Trip signal
synthesis circuit
L
N
RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6
SPM2
Outdoor
unit
Terminal
board
Indoor microcomputer (AX-7R11)
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
Indoor microcomputer (AX-7R11)
Indoor 2/Outdoor
interface circuit
Indoor 1/Outdoor
interface circuit
C2
D2
C1
D1
INDOOR UNIT 1
INDOOR UNIT 2