Table of Contents
Advertisement
Installation and debugging
1. It must form a complete set of documents (project layout for group control
net, installation and construction records for group control net, debugging
records for group control net, maintenance and repair records for group
control net) for group control net of Haier commercial air conditioner long
distance system (hereinafter for short as: group control net) from layout
design, installation, debugging to after service, and file all for future
reference.
2. Layout design of group control net shall be finished in advance, including:
(1) compositions of group control net system and quantities controlled;
(2) selection type of air conditioner, installation place, power distribution and
wiring manner and connection to detector;
(3) installation place of detector, allocation of unit address code, power distri-
bution and wiring manner and connection to group control bus;
(4) installation and wiring of group control bus, length limitation of bus,
resistance matching of two ends of bus, and single point earth of bus shield-
ing layer;
(5) installation place of central controller, allocation of unit address code, power
distribution and wiring manner.
3. Principles of layout design of group control net:
(1) detector is essential part, to keep proper responding speed and communication
reliability, detector quantities carried by one central controller shall not more
than 64;
(2) air conditioner must be a net air conditioner, installation must strictly follow
the installation and operation instructions shipped with the unit, and confirm
that power blackout compensation function of local air conditioner has been
cancelled when debugging;
(3) suggest that do not use two-unit switchover function of detector in the case
of high load, i.e. suggest that do not use one detector to load two air condi-
tioners when detector forming group control net, otherwise temperature
difference control may be affected. If it is necessary to install two-unit switch-
over function for group control net, air conditioners with same type and half
installation distance of that of normal installation are required;
(4) installation place of detector shall not too far away from air conditioner, not
exceed the wiring length;
(5) unit address code of detector shall be strictly allocated in a sequence from
small one to big one, and set continuous unit number;
(6) for power distribution of detector, the power distribution line and commu-
nication line shall not be too close from each other or in the same wiring
channel, and no other special requirements;
22
Advertisement
Table of Contents
