Device Control System; Control System; 20Fsg - Hitachi FSG1 Series Technical Catalogue

CONTROL SYSTEM

9
/2
9.1.

DEVICE CONTROL SYSTEM

9.1.1.
RAS-5~20FSG
Control Subject
Fan Revolution of Outdoor Unit
Opening Degree of Micro-
Computer Control Expansion
Valve of Outdoor Unit
Opening Degree of Micro-
Computer Control Expansion
Valve of Indoor Unit: MV
Inverter Frequency of
Compressor
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
Circuit
Drive Circuit
Indoor Unit
Symbol
MC Motor (for Compressor)
MIF Motor (for Indoor Fan)
MOF Motor (for Outdoor Fan)
MS Motor (for Auto-Louver)
MV1, 2 Electronic Expansion Valve
EHW Electric Heater
Cooling Operation
For Controlling Discharge Pressure: Pd
Fully Open
1. For Controlling Temperature Difference between
air Inlet and air Outlet of Indoor Unit
2. For Controlling Temperature Difference between
Gas Pipe and Liquid Pipe of Indoor Unit Heat
Exchanger
3. For Controlling Temperature of Discharge Gas
Super-Heat: Td SH
For Refrigerant Circulation of Total Operating Indoor
Units
Thermistor for Inlet Air
Thermistor of Discharge Air
Thermistor of Gas Pipe
Thermistor of Liquid Pipe
A+D
Conversion
Circuit
Indoor Unit
MCU
Fan Protection
Control Circuit
To Transmission Circuit of the next Indoor
Unit or The Next Outdoor Unit (H-Link)
Name
Purpose
For Controlling Pressure based on Outdoor air
Temperature
For Controlling Temperature of Discharge Super-
Heat: Td SH
1. For Controlling Temperature Difference
between air Inlet and air Outlet of Indoor Unit
2. For Balancing Temperature Differences
between Gas Pipe and Liquid Pipe of each
Indoor Unit
For Refrigerant Circulation of Total Operating
Indoor Units
Suction Gas Pressure Sensor
Discharge Gas Pressure Sensor
Thermistor of Ambient Temperature
Discharge Gas Thermistor
Thermistor for Heating Evaporation Temperature
A+D
Conversion
Circuit
Outdoor Unit
MCU
Electrical Control
Relay Drive
Expansion Valve
Circuit
Drive Circuit
Symbol
CMC Magnetic Contactor
RVR 4-Way Valve
SVa Solenoid Valve (for Gas Bypass)
PSH Pressure Switch
CT1,2,5 Current Transformer
CH Crankcase Heater
Heating Operation
Multiple Signals
Single Signals
Operation Signals
Power Source
Protection
Circuit
Inverter Power
Inverter
Control MCU
AC
Chopping
Circuit
Outdoor Unit
Name
380/415V
Section