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(11) | EP 2 535 669 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Multi-split type air conditioning system |
| (57) Provided is a multi-split type air conditioning system AC in which a plurality of
indoor units 30 are connected in parallel, and which comprises a receiver 20 installed
upstream of an outdoor heat exchanger 12 that serves as an evaporator in heating operation;
and an outdoor unit electronic expansion valves 21 installed between the receiver
20 and the outdoor heat exchanger 12, wherein a control unit 50 is provided with an
in-heating-operation opening degree control mode for controlling the outdoor unit
electronic expansion valve 21, the in-heating-operation opening degree control mode
comprising an open-loop control that performs an operation for a predetermined time
period with an outdoor unit electronic expansion valve interim opening degree set
corresponding to the actual number of rotation of a variable-power operated type compressor
11 determined by the number of the indoor units 30 being in operation and outdoor
air condition; and an outdoor air temperature, a total heat exchange capacity value
of the indoor heat exchangers 31, a number of indoor heat exchangers 31 that are stopped,
suction superheating and discharge superheating of the variable-power operated type
compressor 11 are employed as parameters for calculating the outdoor unit electronic
expansion valve interim opening degree.
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