Haier AC142ACBEA Service Manual page 37

3 pieces of polar wire must connect the wired controller and the master
unit (the indoor unit connected with wired controller directly), the others
connect with the master unit through 2 pieces of polar wire.
B. One wired controller controls one indoor unit, and the indoor unit
connects with the wired controller through 3 pieces of polar wire.
C. Two wired controllers control one indoor unit. The wired controller
connected with indoor unit is called master one, the other is called slave
one. Master wired controller and indoor unit; master and slave wired
controllers are all connected through 3 pieces of polar wire.
3. Communication wiring:
The wired controller is equipped with special communication wiring in the
accessories. 3-core terminal (1-white 2-yellow 3-red) is connected with the
terminal A、B、C of wired controller respectively.
The communication wiring is 4 meter long; if the actual length is more than
it, please distribute wiring according to below table:
Communication wiring length（m）
<100
≥100 and <200
≥200 and <300
≥300 and <400
≥400 and <600
※ One side of the shielded sheet of communication wire must be earthed.
Dimensions of wiring
2
0.3mm X3-core shielded wire
2
0.5mm X3-core shielded wire
2
0.75mm X3-core shielded wire
2
1.25mm X3-core shielded wire
2
2mm X3-core shielded wire