Haier YR-H 71 Service Manual page 53

Installation and Debugging
(13) in principle, installation place of central controller shall be arranged in the middle of
communication bus, close to shielding earth line of communication bus; (14) unit address codes of
central controller adopt the default settings; (15) central controller has its own power distribution line,
the power distribution line and communication line shall not be too close from each other or in the
same wiring channel, and no other special requirements.
5. Installation and construction of wiring of group control network shall be processed together with
installation and debugging of net air conditioner, pay attention to commissioning before installation.
6. Connection between detector and air conditioner: detector working mode and unit address code shall
be strictly set according to planned layout; detector makes wire communication with at most two air
conditioners (A, B) through 4-poles screw-fixing terminal at air conditioner interface (A
connection between detector and air conditioner use uniform wiring; use uniform wiring for
connection between detector and air conditioner, one plug in type terminal of wiring connected to
Remote control interface on the computer board of air conditioner, and cores of another terminal
respectively connected to A
connected to A /B and black/red wire connected to A
+ +
debugging, then can check and remove malfunction by changing positive and negative polarity.
During debugging also can judge whether communication interface to air conditioner is normal
according to the running status indicated by operation indicator (green LED).
7. Connect detector and communication bus after finish the wiring of communication bus: connect
several detectors to communication bus in parallel, all terminal port A (including central controller)
on one bus, and all terminal port B (including central controller) on another bus, at both ends of the
communication bus - A terminal port line and B terminal port line shall paralleling connect a metal
membrane precision resistance of 100 or 120 ohm respectively if needed. Earth one point of the
shielding line of communication bus, which is at the middle position of the communication bus, and
the total length of communication bus shall be limited within 1000m.
8. Connect central controller and communication bus after finish installation and connection of detector:
central controller is connected to communication bus through the 2-post screw-fixing terminal (A and
B) of interface RS-485, locating in the middle of the communication bus, with position close to the
earth point of the shielding line of communication bus.
9. Power on and debugging: after power on, central controller periodically monitors the detector and air
conditioner groups on the communication bus, and after inquiring for a period of time the unit
number shall display as expected, check and debug if having any difference.
10. Set the dialing switch of detector: (1) there is a 8-bit (1～8) dialing switch inside the detector, OFF
means 0 and ON means 1; (2) the eighth bit used for setting single unit working mode or two-unit
switchover working mode, OFF means single unit and ON means two-unit; (3) the lower seven bits
(from the seventh to the first bit) have up to 128 selections when forming group control net, which are
used for setting unit address code, see the table below for detail setting check list; (4) the lower seven
bits have up to 128 selections when forming group control net and using two-unit switchover function,
which are used for setting unit address code, see the table below for detail setting check list, and the
default two-unit switchover time is 24hrs; (5) the lower seven bits have up to 128 selections when not
forming group control net, which are used for setting two-unit switchover time, see the table below
for detail setting check list.
and A (B and B ); connection has polarity, and generally white wire
+ - + -
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/B ; if detector cannot work normally when
- -
A , B , B );
+, - + -