Indoor unit for air-conditioning apparatus

An indoor unit for an air-conditioning apparatus, comprising:

• one box-shaped casing having an air inlet and an air outlet;
• a partition plate part partitioning an inside of the box-shaped casing to form at least two wind passages communicating the air inlet and the air outlet with each other;
• a plurality of separate air-sending devices respectively provided in the wind passages to suction air through the air inlet into the wind passage and blow out the air through the air outlet;
• separate heat exchangers respectively provided between the separate air-sending device and the air outlet in each of the wind passages, connected with a corresponding independent outdoor unit to configure a separate refrigerant circuit, and air-conditioning the air suctioned through the air inlet;
• a controller programmed to, in accordance with an accumulated operating time period of each of the separate air-sending devices, determine a separate air-sending device, of the separate air-sending devices, to be operated;
• an air transfer wind passage for communicating between the wind passages through a cutout of the partition plate part located between the separate heat exchangers and the air outlets;
• and
• a partition plate, different from the partition plate part, for blocking the air transfer wind passage or the air outlets in an openable/closable manner, wherein
• a first insert opening in the box-shaped casing for accommodating the partition plate in an insertable/removable manner is formed at a position of the box-shaped casing and facing the air transfer wind passage, and
• second insert openings in the box-shaped casing for accommodating the partition plate in an insertable/removable manner are formed at positions of the box-shaped casing and facing the air outlets.