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[ III Heat source Unit Components ]
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HWE09080 GB
[3] Heat source Unit Circuit Board
1. Heat source unit control board
CN332
Output 18VDC
GND
LED2
Lit during normal
CPU operation
Serial communication signal input
GND
INV board
Output 17VDC
CN801
Pressure switch
connection
CN4
GND
Serial communication signal output
LEV
driving output
LED1
Service LED
SWU1,2
Address switch
SW1-5
Dip
switch
Sensor
input
CNVCC2
Output 12VDC
Output 5VDC
GND
CNIT
Output 12VDC
GND
Output 5VDC
Power supply detection input
Power supply ON/OFF signal output
CNS2
Transmission line input/output
for centralized control system (30VDC)
CN41
Power supply for
centralized control OFF
CN40
Power supply for
centralized control ON
CN102
Indoor-heat source transmission line input/output (30VDC)
Power supply input for centralized control system (30VDC)
External signal input (contact input)
F01
Fuse
250V AC/3.15A
CNAC
L1
L2
Actuator
driving output
Output 12VDC
Compressor
ON/OFF output
Error output
CN51
CNAC2
L1
L2
CNDC
Bus voltage input
P
N
CN2
CN72
72C driving output
(YHMU)
CN505
72C driving output
(THMU)
LED3
Lit when powered