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DC Inverter Multi
VRF Service Manual
CONTROL
Step 5: Troubleshooting during Installation of Centralized Controller
Generally speaking, connection of communication lines, address DIP of communication module and address mapping
setting of centralized controller are the common problems during installation of centralized controller. These problems
can be reected from running indicator (green) of communication module. Meanwhile, it is recommended to debug the
centralized controller after making communication of outdoor and indoor units smooth to simplify the problems.
A� Connection of communication lines
1) If incorrect or non-connection of communication module, centralized controller and communication line of indoor
and outdoor units, the green indicator will be black all the time.
2) It indicates connection problem between communication module and centralized controller that green indicator
blinks once every 2s.In this case, COM2 must be used to connect them.
3) It indicates connection problem of communication module and indoor and outdoor units that green indicator blinks
twice every 2s. In this case, COM1 must be used to connect them. Refer to Step 2, C for details.
B� Address DIP of communication module
There are two methods for address setting. The one is that communication module has been set by software store,
but the 3-digital DIP switch can not be dialed to OFF completely. The other one is to set it manually, but the 3-digital DIP
switch should be dialed to OFF completely. Refer to step 3 for details.
Digital
switch
C� Address mapping setting of centralized controller
The centralized controller only can normally operate after specifying address of communication module needed
to control. If not, the operation status of communication and indoor units can not be displayed by it. Refer to Step 4 for
details.
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