
– 25 –
Split Inverter Air-to-Water Heat Pump
Outdoor Unit Main Board I/O Interface Description
Wiring
No
Label
Description
1
N
Neutral Terminal
2
L
Line Voltage Terminal
3
R003
4-Way Valve Control Terminal
4
R006
Bottom Coil Heat Tape Terminal
5
R007
Crankcase Heat Tape Terminal
6
R008
Spray Valve Terminal
7
AI03
Discharge temp sensor input
8
AI05
Ambient temp sensor Input
9
AI07
Return air temp sensor input
10
AI08
Coil temp sensor input
11
AI10
EVI inlet temp sensor input
12
AI11
EVI outlet temp sensor input
13
AI21
Return air pressure sensor
14
AI22
Discharge pressure sensor
15
DI01
High pressure switch
16
DI02
Low pressure switch
17
DI04
Remote switch
18
DI05
Mode switch
21
CN1
Expansion valve interface
22
CN2
EVI interface
23
485A1/485B1
Indoor Unit 485 Communication interface
24
CN14(485A2/485B2)
Compressor, DC Fan driver board 485 communication interface