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a. Power Supply Interface
c The power supply module board CN1 interface is for the external power cord connection board. The AC-N
terminal is for the neutral line, the AC-L terminal is for the live line and the middle terminal remains open.
dThe power supply module board CN4 interface, which is for the power supply of the display board, is
connected with the display board CN1 interface using the two-core wire provided by XQLW.
b. Communication Interface
The CN2, CN3, CN4 and CN5 interfaces of the display board are for communication. CN2, namely
COM4, is for the duct type unit (2-pin) communication; CN5, CN4, CN3, namely COM1, COM2, COM3
respectively, are for the multi VRF system (3-pin) communication.
7.1.3 Preparation and Connection of the Communication Line
a. The communication line between the centralized controller and the unit should be prepared by the user
according to the particular project.
b. Preparation and connection of the communication line for the multi VRF system
c. One three-core communication line is needed to connect one set of a multi VRF system to one interface
(COM1, COM2 or COM3) of the FHQWUDOZLUHG controller.
d. One end of the communication line is connected with the FHQWUDOZLUHG controller and the other is connected
with the three-pin socket of the indoor unit.
c. Preparation and connection of the communication line for the duct type unit
c . The communication line for the duct type unit is the two-core line provided by XQLW (one end is the two-
core head and the other end is the crystal head, code: 40113325).
d . If N sets of duct type units exist, then N+1 communication lines are required.
e. Connect the two-core heads of one communication line to the COM4 port of the FHQWUDOZLUHG controller
and connect the two-core heads of N communication lines to the two-pin socket of the duct type unit wired
controller.
f . The user can prepare the extension line and connect the wires inside the crystal head according to his
particular requirements.
Note: one set of a Multi VRF system consists of one multi VRF outdoor unit and one or more multi VRF
indoor units. One set of duct type units consists of one duct type outdoor unit and one duct type indoor unit.
7.1.4 Installation
One may proceed with installation of the units after selecting an installation location and adhering to the
following installation steps:
a. Verify the set location intended for the FHQWUDOZLUHG controller installation.
b. Embed the power supply box (2) as displayed in Fig.7.6 for the installation of the bottom case (3).
c. Connect the power cord and the communication line of the display board and then thread both of them
through the power supply box (2).
d. Attach the bottom case onto the power box (2) using screws.
e. Tidy up the power cord and the communication line inside the FHQWUDOZLUHG controller.
f. Close the cover (5).
Fig.7.4 Concealed Cable Installation 1 (right-left wiring)
Fig.7.5 Concealed Cable Installation 2 (up-down wiring
Note: the power cord must be separeted from the
communication line to avoid any interference
Hole for the power cord
Hole for the communication line
Fig. 7.6 Installation Diagram
Serial No. Description
1 Wall
2 Power Supply Box (86)
3 Bottom Base(including power supply module board)
4 Screw
5 Top Cover(including the display board)
After the installation, it is necessary to run through the debugging process in order to guarantee normal
communication.
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18


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