Hitachi UTOPIA RAS-4HVRP2E Service Manual page 85

5 Control System
Device control system
The figure below shows the outline of the control system for RAS-(4-6)H(R/N)(C/P)2E
Wireless remote control switch
Remote
control MCU
Wireless transmission circuit
Remote control switch
Remote
control
MCU
Electrical control
Relay drive
expansion valve
circuit
drive circuit
MV MS
Indoor unit
Symbol
MC Motor (for compressor)
MIF Motor (for indoor fan)
MOF Motor (for outdoor fan)
MS Motor (for auto-louver)
MV Electronic expansion valve
CMC Compressor magnetic contactor
83 SMGB0136 rev.0 - 07/2021
Thermistor for inlet air
Thermistor of discharge air
Thermistor for gas pipe
Thermistor for liquid pipe
A+D conversion
circuit
Indoor unit MCU
Protective
Fan control
circuit
MIF
To the transmission of the next indoor
unit or the next outdoor unit (H-LINK)
Description Symbol
CH
RVR
SVA
PSC
PSH
Suction gas pressure sensor
Discharge gas pressure sensor
Thermistor for outdoor temperature
Discharge gas thermistor
Thermistor for heating evaporation temperature
Discharge Gas Pressure Sensor (Pd)
PSC PSH
A+D conversion
circuit
Outdoor unit
MCU
Electrical control
Relay drive
expansion valve
circuit
drive circuit
MV
CH1 RVR
Crankcase heater
4-Way valve
Solenoid valve
Low Pressure switch for control
High Pressure switch
Multiple signals
Single signals
Operation signals
Power source
Protection circuit
Inverter power
Inverter
control
MCU
Inverter
control for fan
MCU
MOF
Outdoor unit
SVA
Description
section
MC
5