Hitachi UTOPIA RAS-4HVRP2E - Location of Print Circuit Boards (Pcbs); Purpose; RSW, Dsws and Leds Functions RAS-(4-6)H(R;N)(C;P)2 E

10 Troubleshooting
Checking procedure for main parts
SMGB0136 rev.0 - 07/2021
319
10
10.4.3 RSW, DSWs and LEDs functions RAS-(4-6)H(R/N)(C/P)2E
10.4.3.1 Location of print circuit boards (PCBs)
PCB1
TB
NF1
PCB2(INV)
PCB3
DCL
1 2 3
4
1
2
3
4
10.4.3.2 Purpose
Symbol PCB Purpose
PCB1
Control and
Inverter PCB
1. Transmission between the indoor and outdoor units.
2. Processing for sensor input.
3. Processing for dip switch input.
4. Operation control for parts 1 to 3. Compressor operating control, control of the bypass
valve, fan control and overcurrent control.
5. Processing of the safety device input.
6. Processing of the relay output.
7. Detection of reverse phase for power source.
PCB2 DSW-PCB
1. 7-segment display indication.
2. Transmission dip switch input to PCB1.
PCB3 Fan PCB Drive Fan1 Motor.