7
2. Main control board (The picture is for reference only)
1.
Transformer output port
2.Tin/Tb1/Tout/Tb2 temperature sensor port
Note: Tin: water inlet temp. Tout: water outlet temp.
Tb1: Temp. 1 of plate heat exchanger
Tb2: Temp.2 of plate heat exchanger
3. Radiator temperature sensor port(Reserved) (T6)
4. Discharge temperature sensor port
5.1 Outlet of outdoor heat exchanger temp. sensor port(T3)
5.2 Ambient temp. sensor port (T4)
6.Operation and display panel port
7.1 Low pressure switch
7.2 High pressure switch
8.Differential pressure valve port
9.Factory debug port
10.Wired controller port
11.Electric expansion valve port
12.Power supply input port L
13.Power supply input port N
14.Ground wire
15.
Rectifier bridge input port N
16.
Rectifier bridge input port L
17.
8A fuse tube
18.
Solenoid valve port (Reserved)
19.
Exhaust valve electric heater port
20.
Plate heat exchanger electric heater port
21.
Flow switch electric heater port
22.
Built-in water pump port
23.
Compressor electric heater port
24.
4-way valve port
25.
External pump/Remote alarm port
26.
Remote control port
27.
Transformer input port
28.
P/N/+15V port
29.
Communication port between IPDU and main PCB
30.
Down DC fan port
31.
Check touch switch
32.
Up DC fan port
33.
Force-cooling touch switch