Air conditioner and control method thereof

A control method of an air conditioner including a compressor configured to compress refrigerant and thereby discharge high pressure refrigerant gas, an outdoor heat exchanger in which the high pressure refrigerant gas is changed to refrigerant fluid, and an outdoor fan configured to blow outdoor air to the outdoor heat exchanger, the control method comprising:

• determining an operation condition based on operation conditions including:
• a first condition that is based on an installation environment of the air conditioner,
• a second condition that is based on an optimal compression ratio of the compressor,
• a third condition that is based on an outdoor temperature, and
• a fourth condition that is based on a default temperature of the refrigerant or a default pressure of the refrigerant;
• setting a highest value of the operation condition to be a target condition;
• and
• controlling a pressure of the refrigerant or a temperature of the refrigerant based on the target condition,
• wherein the first condition that is determined based on the installation environment of the air conditioner includes at least one of a length of a connection pipe connecting an indoor unit to an outdoor unit or a difference in pressure level between the outdoor unit and the indoor unit.

An air conditioner comprising:

• an outdoor unit including a compressor;
• an indoor unit including a decompressor, wherein the outdoor unit is coupled to the indoor unit so that the refrigerant is circulated between the outdoor unit and the indoor unit to be compressed by the compressor to a high pressure refrigerant gas and decompressed by the decompressor into a low pressure fluid;
• and
• a controller configured to control a pressure of the refrigerant or a temperature of the refrigerant based on operation conditions including:
• a first condition that is based on an installation environment of the air conditioner,
• a second condition that is based on an optimal compression ratio of the compressor,
• a third condition that is based on an outdoor temperature, and
• a fourth condition that is based on a default temperature of the refrigerant or a default pressure of the refrigerant,
• wherein the first condition that is determined based on the installation environment of the air conditioner includes at least one of a length of a connection pipe connecting an indoor unit to an outdoor unit or a difference in pressure level between the outdoor unit and the indoor unit.