Simultaneous heating and cooling type multi-air conditioner and method for controlling the same

Abstract

A simultaneous heating and cooling type multi-air conditioner and a method for controlling the same to achieve desired heating and cooling capabilities of indoor units and the reliability of a system by a compensation control carried out in a state in which capacities of a compressor and an outdoor fan are fixed at predetermined values. In the simultaneous heating and cooling type multi-air conditioner including an outdoor unit having a compressor and an outdoor fan, a plurality of indoor units connected to the outdoor unit, and a heating and cooling switching unit corresponding to the respective indoor units, to enable simultaneous heating and cooling operations of the plurality of indoor units, first, it is determined whether or not a primary cooling operation is selected. If the primary cooling operation is selected, the outdoor fan is operated for a predetermined time in a state in which the air flow of the outdoor fan is fixed at a predetermined capacity depending on a condensation pressure. Then, a control capacity of the outdoor fan is determined on the basis of an average condensation pressure value for the predetermined time.

Description

technical field [0001] The present invention relates to a simultaneous heating and cooling type multi-air conditioner in which a single outdoor unit is connected to a plurality of indoor units to simultaneously heat and cool a plurality of indoor spaces, more specifically , the present invention relates to a simultaneous heating and cooling type multiple air conditioner and a method of controlling the simultaneous heating and cooling type multiple air conditioner in which low pressure control is performed through a change in high pressure to achieve desired heating and cooling performance for an indoor unit. Background technique [0002] Generally, a simultaneous heating and cooling type multi-air conditioner is configured such that a single outdoor unit is connected to a heating and cooling switching unit having a plurality of heating and cooling switching valves to ensure simultaneous heating and cooling operations on the plurality of indoor units, and the single outdoor un...

AI Technical Summary

Problems solved by technology

[0007] However, in the case of the above-mentioned main cooling operation, when the outdoor fan is turned on, the condensation temperature decreases according to the decrease in the condensation pressure, resulting in poor heating performance

When the outdoor fan is turned off, although the heating performance is improved by increasing the condensing pressure, the condensing pressure will exceed the control point

That is, there is a large change in high voltage depending on the switching of the outdoor fan, which deteriorates the reliability of the system and makes it difficult to achieve the desired heating and cooling performance for the indoor unit

In addition, even when the heating indoor unit has a low operating capacity, there is a large change in low pressure, resulting in unstable capacity of the compressor

Therefore, it is difficult to achieve the reliability of the system and the desired heating and cooling performance of the indoor unit, thereby dissatisfying users

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