Haier YCS-A001 Manual page 16

Installation and Debugging
(3) Installation position of detector, address and unit number distribution, power
distribution and wiring treatment, connection with group control bus; (4) Installation
and wiring of group control bus, bus length limitation, the matched resistors at the two
ends of bus, the shielded layer of bus shall be single-point grounded; (5) Installation
position of central controller, address unit number distribution, power distribution and
wiring treatment.
3. The programming principle of group control network: (1) Detector is the essential
part; in order to guarantee proper response speed and reliable communication, the number
of detector equipped on the central controller shall not exceed 64; (2) The air conditioner
must be network air conditioner, and the installation must be performed according to
the attached operation and installation manual; in test run, cancel the air conditioner's
Power Failure Resume function; (3) It is recommended do not use the double units switch
function of the detector in the big load circumstance, that is it must be equipped with
group control network double units switch function, which requires the model of the
used air conditioners must be the same and the installation space is half of the general
installation space; (4) The installation position of the detector shall not be too far from
the air conditioner and shall not exceed the length of the connecting wire; (5) The detector
address unit number must be strictly distributed in the increasing sequence and set the
successive unit number; (6) Detector power distribution: the wiring shall not be too close
to the communication wire or pass through the same wire channel; no other special
requirements; (7) Connection of detector and group control bus: it is not allowed to
connect additional branch wire to the group control bus; (8) The shielded wire of detector's
air conditioner communication wire is short connected with the shielded wire of detector's
central controller communication wire; (9) The wiring of group control bus shall not be
too near the connecting wire or pass through the same wire channel; the rest can refer
to the wiring requirements of the storied building's auto control system; (10) The total
length of group control bus limits in 1000m; (11) At the ends of the bus and between A
bus and B bus shall respectively connect a 100 metal film precise resistor; address unit
number of central controller and weekly timer shall not be repeated;
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