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V8 VRF Indoor Units

Troubleshooting Guide

Table 1.7: Medium Static Pressure Duct main PCB ports (continued)

Label in

Figure 1.4

Code

Content

Port voltage

Note

CN81

T2 Temperature sensor connection

3.3V DC

Standard

CN82

T1 Ambient Temperature sensor connection

3.3V DC

Standard

CN83

T2B Temperature sensor connection

3.3V DC

Standard

CN-A

Sterilization module port

12V DC

Customized

CN30

Display Panel connection

12V DC

[5]

Standard

CN35

Humidity sensor connection

3.3V DC

[5]

Customized

CN5

Water level port

3.3V DC

[5]

Standard

CN190

Drainage pump port

12V DC

[5]

Standard

CN18

Communication Switch Board,

5V/12V DC

[5]

Customized

CN16

Reserved

12V DC

CN25

Program burning port(indoor unit)

3.3V DC

[5]

Standard

CN8

EEV drive port

12V DC

[5]

Standard

CN55

Remote control ON/OFF port

Connect pin 2 and 3,

The IDU will be

forced to shut down

Standard

CN6(X1X

2,PQE)

X1 X2 communication port(with wire controller);

P Q communication port(with ODU by RS-485)

X1 X2:18V DC ;

P,E or Q,E:

2.5-2.7V DC

Standard

CN2(D1D

D1 D2 communication port(with Central controller)

D1,E or D2,E

2.5 - 2.7V DC

Standard

CN10(M1

M2)

M1 M2 communication port(with ODU by HyperLink)

24V DC

Standard

CN99

After-sale Kit communication port

12V DC

[5]

Standard

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