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6. APPENDIX
NUMBER
SIGN
24
+5V
25
+12V
26
GND
27
485_B1
485_A1
28
12V
29
30
GND
31
485_B2
485_A2
32
12V
33
34
CN9
35
GND
36
485_B3
485_A3
37
12V
38
Notes:
When the unit uses EC fan, PWM-IN port is used for feedback input of EC fan by default, and AI/
DI11 port is used as master-slave switch by default; when the unit uses non-EC fan, PWM-IN port
is used as master-slave switch by default, and AI/DI11 port is used as anti-freezing protection
switch by default.
22
MEANING
+5V (output)
+12V (output)
Frequency conversion board communications
LED controller communication
Electronic expansive valve
The port for centralized control
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