Outline Of The Control System - Hitachi RAS-(3-6)HVRNM2E Service Manual

5 Control System
The figure below shows the outline of the control system
Wireless remote control switch
Remote
control MCU
Wireless transmission circuit
Remote control switch
Remote
control MCU
Electrical control
Relay drive
expansion valve drive
circuit
circuit
MV MS
Indoor unit
Symbol
MC Motor (for compressor)
MIF Motor (for indoor fan)
MOF1, 2 Motor (for outdoor fan)
MS Motor (for auto-louver)
MV Electronic expansion valve
CMC Compressor magnetic contactor
119
SMGB0064 rev.0 - 08/2011
Thermistor for inlet air
Thermistor of discharge air
Thermistor for gas pipe
Thermistor for liquid pipe
A+D conversion
circuit
Indoor unit MCU
Protection
Fan control
circuit
MIF
To the transmission of the
next indoor unit or the next
outdoor unit (H-Link)
Name
Suction gas pressure sensor
Discharge gas pressure sensor
Thermistor for outdoor temperature
Discharge gas thermistor
Thermistor for heating evaporation temp.
PSC
A+D conversion
circuit
Outdoor unit MCU
Electrical control
Relay drive Inverter control
expansion valve
circuit for fan MCU
drive circuit
MV
MOF2
SVA
CH1 MOF1 RVR
B.F.
Symbol
CH
CT1
RVR
SVA,B,F
PSC Pressure switch for control
EHW
Multiple signals
Single signals
Operation signals
Power source
Protection circuit
Inverter power
section
Inverter control
MCU
MC
CT1
Outdoor unit
Name
Crankcase heater
Current transformer
4-Way valve
Solenoid valve
Electric heater
5