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How to connect signal cables
The communication protocol can be choosen from following two types. One of them is the conventional Superlink (herein-
after previous SL) and the other is the new Superlink II (hereinafter new SL) . These two communication protocols have the
following advantages and restrictions, so please choose a desirable one meeting your installation conditions such as con-
nected indoor units and centralized controller. When signal cables are connected into a network involving outdoor units,
indoor units or centralized control equipment that do not support new SL, please select communications in the previous SL
mode, even if the refrigerant system is separated from theirs.
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● A signal cable system is operated at DC5V, so never connect it to the power source 220/240V or 380/
415V. If the power source is applied, a protective fuse provided on the board will be actuated. If the protective fuse is
actuated, follow the procedure set out below.
(1) Turn off power and make sure that 220/240V or 380/415V is not applied to signaling wires.
(2) In the case of an indoor unit, switch from CNK1 to CNK2 and cut the jumper line J21.
(3) In the case of an outdoor unit, switch from CNX1 to CNX2 and cut the jumper line J10.
(4) Check signal cable terminal block resistance before you turn on power. If the resistance value is 100 ohms or less,
there is possibility that a power cable is connected to a signal cable terminal block.
A typical resistance value is [46000 / (No. of connected FD KXE4 series units x 5) + (No. of
connected FD KXE6 series units x 9)].
If the resistance value is 100 ohms or less, tentatively detach signal cables and thus, divide the network into more than
one block (to reduce the number of indoor units connected in a network) to check for cabling errors in each such block.
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Indoor and outdoor signal wires
● Connect the signal line between indoor unit and outdoor unit to A1 and B1.
● Connect the signal line between outdoor units to A2 and B2.
● Please use a shielded cable for a signal line and connect a shielding earth at all the indoor units and outdoor units.
Important
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