5 Control System
Device control system
SMGB0136 rev.0 - 07/2021
80
5.1 Device control system
The gure below shows the outline of the control system.
5.1.1 RAS-3HVRC2
A+D conversion
circuit
Thermistor for outdoor temperature
Discharge gas thermistor
Thermistor for heating evaporation temperature
Protection
circuit
Inverter
control MCU
Inverter power
section
MC
ACL
Outdoor unit MCU
Transmission
circuit
CH1
MV
RVR
MOF
Outdoor unit
PSC
PSH
Power source
Multiple signals
Single signals
Operation signals
Electrical control
expansion valve
drive circuit
Relay drive
circuit
Inverter control for
fan MCU
Transmission
circuit
Remote
control MCU
Wireless remote control switch
Wireless transmission circuit
A+D conversion
circuit
Thermistor for inlet air
Thermistor of discharge air
Thermistor for gas pipe
Thermistor for liquid pipe
Transmission
circuit
Protective
circuit
Fan control
Indoor unit MCU
Transmission
circuit
Relay drive
circuit
Electrical control
expansion valve
drive circuit
Remote
control
MCU
Remote control switch
MV
MS
MIF
Indoor unit
To the transmission of the next indoor
unit or the next outdoor unit (H-LINK)
Symbol Name Symbol Name
PSH High pressure switch ACL Reactor
THe Electrical heater thermostat protection MC Motor for compressor
Input 1~7 Optional inputs MIF Motor for indoor fan
Output 1~4 Optional outputs MS Motor for auto-louver
CH1 Crankcase heater MV Electronic expansion valve
MOF Motor (for outdoor fan) PSC Pressure switch for control
RVR 4-way valve PSH High pressure switch
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