AIR-CONDITIONING APPARATUS

摘要

In a heating main operation mode in which a load to be processed by the heating operation is dominant during cooling and heating mixed operation, an air-conditioning apparatus closes an opening and closing valve, and adjust the opening degree of an expansion device in accordance with the evaporating temperature of a load-side unit requesting cooling.

主权项

1. An air-conditioning apparatus capable of cooling and heating mixed operation and configured such that at least one heat-source-side unit including a compressor and an outdoor heat exchanger is connected to a plurality of load-side units each including an expansion device and an indoor heat exchanger, the plurality of load-side units being connected to the heat-source-side unit in parallel,
the air-conditioning apparatus comprising: an opening and closing valve mounted in the heat-source-side unit to adjust a flow of refrigerant from the load-side units to the outdoor heat exchanger; a heat-source-side expansion device mounted in the heat-source-side unit and provided in parallel with the opening and closing valve; and a controller configured to control at least opening and closing of the opening and closing valve and an opening degree of the heat-source-side expansion device, wherein the controller, in a heating main operation mode in which a heating load is dominant in the cooling and heating mixed operation with the plurality of load-side units and under a condition where a liquid pipe temperature of the load-side unit that is performing a cooling operation is within a temperature range of antifreezing control, closes the opening and closing valve, and controls the opening degree of the heat-source-side expansion device according to an evaporating temperature of the load-side unit requesting cooling so as to adjust the evaporating temperature to be within a predetermined range.