Midea V8 VRF Series Service Manual page 14

Table 1.7: Medium Static Pressure Duct main PCB ports (continued)
Label in
Code Content
Figure 1.4
7 CN81 T2 Temperature sensor connection
8 CN82 T1 Ambient Temperature sensor connection
9 CN83 T2B Temperature sensor connection
10 CN-A Sterilization module port
11 CN30 Display Panel connection
12 CN35 Humidity sensor connection
13 CN5 Water level port
14 CN190 Drainage pump port
15 CN18 Communication Switch Board,
16 CN16 Reserved
17 CN25 Program burning port(indoor unit)
CN8
18 EEV drive port
19 CN55 Remote control ON/OFF port
X1 X2 communication port(with wire controller);
CN6(X1X
20
2,PQE)
P Q communication port(with ODU by RS-485)
CN2(D1D
21 D1 D2 communication port(with Central controller)
2)
CN10(M1
22 M1 M2 communication port(with ODU by HyperLink)
M2)
23 CN99 After-sale Kit communication port
Notes:
1. Standard: The model has this function, the customers can connect corresponding device through this port, such as water pump and hotel key card etc.
Customized: This function needs to be customized before leaving the factory.
Reserved: This port can not be used.
2. When repairing, PQ connects after-sales tooling
3. PQ and M1M2 communication ports both are used for indoor and outdoor communication, and only one of them can be used at a time. Meanwhile, be
sure to connect the same communication ports (PQ to PQ; M1M2 to M1M2) in case of damage of the main control board.
4. D1D2 communication ports are used for group control communication. When connecting the group controller, the D1D2 port of the indoor units that are
to be group controlled must be connected in daisy chain, and the group controller must be connected to the X1X2 port of one o f the indoor units in the
group control, and set to group control mode. In addition, D1D2 communication ports can also be connected to the central controller.
5. Refer to Table 1.2 for voltage test instructions of some ports.
V8 VRF Indoor Units
Port voltage Note
3.3V DC Standard
3.3V DC Standard
3.3V DC Standard
12V DC Customized
[5]
12V DC Standard
[5]
3.3V DC Customized
[5]
3.3V DC Standard
[5]
12V DC Standard
[5]
5V/12V DC Customized
12V DC /
[5]
3.3V DC Standard
Standard
12V DC [5]
Connect pin 2 and 3,
The IDU will be Standard
forced to shut down
X1 X2:18V DC ;
P,E or Q,E: Standard
2.5-2.7V DC
D1,E or D2,E
Standard
2.5 - 2.7V DC
24V DC Standard
[5]
12V DC Standard
13