Hitachi RAS-8.0HNBRMQ1 - Location of Printed Circuit Boards

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1.2 Location of Printed Circuit Boards
(1) Model: RAS-3.0~6.5HNBRKQ1
Symbol PCB Purpose
PCB1
Outdoor Unit Board
(Driver Board)
1. Communicating between Indoor Unit and Outdoor Unit;
2. Processing Sensor Input;
3. Operation Control for Above Items 1 to 2. Compressor Operation Control, Fan2 Control,
Electrical Expansion Valve, 4-Way Valve, Solenoid Valve, and Overcurrent Control;
4. Processing of Safety Device Input;
5. Processing of Relay Output.
PCB2 Service Board
1. Processing DIP Switch Input;
2. 7-Segment Indication.
PCB3 Reactor Board Used for the Power Factor Correction.
PCB4 Fan Motor Driver Board Drive Fan1 Motor.
a. Outdoor Unit Board (PCB1)
Part name Function Information
LED1 (Red)
Power source indicator for main control of the PCB1 (5V)
Normal Condition: Activated /ON; Abnormal Condition: Deactivated /OFF.
LED2 (Red) It indicates: “Alarm”.
LED3 (Yellow) It indicates: “Alarm”.
LED4 (Green) It indicates: “Alarm”.
LED5 (Red)
Indicator for DC Bus Voltage
Normal Condition: Activated /ON; Abnormal Condition: Deactivated /OFF.
LED6 (Red)
Power source indicator for Precharge Relay
Normal Condition: Activated /ON; Abnormal Condition: Deactivated /OFF.
LED7 (Green
）
Power source indicator for inverter control of the PCB1 (3.3V)
Normal Condition: Activated /ON; Abnormal Condition: Deactivated /OFF.
LED8
（
Red
）
Power source indicator for Main Relay
Normal Condition: Activated /ON; Abnormal Condition: Deactivated /OFF.
LED9 (Orange) It indicates: “Alarm”.
LED10 (Yellow)
It indicates the communication state between the indoor unit and outdoor unit.
Normal Condition: Activated /Flash; Abnormal Condition: Deactivated /OFF.
LED11 (Green)
It indicates the communication state between the main control and inverter control of PCB1.
Normal Condition: Activated /Flash; Abnormal Condition: Deactivated /OFF.
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