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(11) | EP 1 956 306 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Multi-system air-conditioner and method for controlling the same |
| (57) A multi-system air-conditioner for limiting a frequency-rising width of a compressor
according to the air-volume of the indoor units, and enabling the indoor units to
discharge the most comfortable-temperature air irrespective of the setup air-volume
of the indoor units. The multi-system air-conditioner includes an outdoor unit, a
plurality of indoor units connected to the outdoor unit, and a compressor for varying
its own frequency according to operation capacity of the indoor units. The method
for operating the multi-system air-conditioner includes: comparing, by each of the
indoor units, a setup temperature with a room temperature, and calculating a capacity
required for each indoor unit; calculating the sum of all the required capacities
of the indoor units to calculate a combination ratio of all the operating indoor units;
and comparing the calculated combination ratio with a reference combination ratio
to determine whether the combination ratio of the indoor units is equal to or less
than the reference combination ratio, limiting a frequency-rising width of the compressor
to a predetermined value according to air-volumes of the operating indoor units when
the calculated combination ratio is equal to or less than the reference combination
ratio, and operating the air-conditioner at the limited value.
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