Johnson Controls HVWHP072B32S - Page 27

SM-18006
3-7
TROUBLESHOOTING
SEG1
SEG2
PSW2
PSW
3
PSW1PSW5 PSW4
LED5
DSW
4
DSW
7
DSW
2
DSW
3
DSW
6
DSW
5
RSW
1
DSW
1
DSW8
LED2
LED1
DSW10 LED4 LED3
a. Control Printed Circuit Board: PCB1 (Water Source Unit PCB)
z
Purpose
Symbol PCB Purpose
PCB1 Water Source Unit PCB 1. Transmitting between Indoor Unit and Water Source Unit
2. Processing for Sensor Input
3. Processing for DIP Switch Input
4. Operation Control for Above Items 1 to 3.
Compressor Operation Control, Bypass Valve Control,
Fan Control and Overcurrent Control
5. 7-Segment Indication
6. Processing of Safety Device Input
7. Processing of Relay Output
8. Reverse Phase Detection for Power Supply
INV1, 2
(For 208/230V Type)
Inverter PCB 1. Inverter components are driven by water source unit PCB to
drive compressor.
2. Overcurrent Control
3. Protection Control for Inverter Part
INV1, 2
(For 460V Type)
Inverter PCB 1. Inverter components are driven by water source unit PCB to
drive compressor.
2. Overcurrent Control
3. Protection Control for Inverter Part
MPB1, 2
(For 208/230V Type)
Main Power PCB
1. Inverter components are driven by water source unit PCB to
drive compressor.
Further explanation of this diagram can be found on the next page.