5 Control System
137
SMGB0087 rev.0 - 12/2013
5
The gure below shows the outline of the control system
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
Suction gas pressure sensor
Discharge gas pressure sensor
Thermistor for outdoor temperature
Discharge gas thermistor
Thermistor for heating evaporation temperature
Protection circuit
Inverter
control
MCU
Inverter power
section
MC
Outdoor unit
MCU
Relay drive
circuit
Electrical control
expansion valve
drive circuit
Transmission
circuit
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
CH1
MV
MOF1
(*)
RVR
SVA
B.F.
MV
MS
MIF
Indoor unit
Outdoor unit
Multiple signals
Single signals
Operation signals
To the transmission of the next indoor
unit or the next outdoor unit (H-LINK)
PSC
MOF2
Inverter
control for
fan MCU
A+D conversion
circuit
CT1
Power source
Symbol Name Symbol Name
MC Motor (for compressor) CH Crankcase heater
MIF Motor (for indoor fan) CT1 Current transformer
MOF1, 2 Motor (for outdoor fan) RVR 4-Way valve
MS Motor (for auto-louver) SVA,B,F Solenoid valve
MV Electronic expansion valve PSC Pressure switch for control
CMC Compressor magnetic contactor EHW Electric heater
(*) For RAS-12HN(P/C) models. Other models, the two fan motors are controlled by the Inverter.
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