Indoor unit of air conditioner and method of connecting refrigerant pipe thereof

An indoor unit of an air conditioner connected to an outdoor unit of the air conditioner by a connection pipe, the indoor unit comprising:

• a frame of the indoor unit;
• a heat exchanger mounted on the frame and having a refrigerant pipe in which a refrigerant flows;
• a hanger plate mounted on a rear surface of the frame and configured to fix the frame onto a wall surface, the frame being rotatable with respect to the hanger plate;
• and
• a holder plate mounted on a lower portion of the frame and connecting the frame and the hanger plate,
• wherein at least one of an end of the refrigerant pipe and an end of the connection pipe is placed in a space formed by the frame, the holder plate, and the hanger plate,
• wherein the holder plate is configured to be detachable from the hanger plate, whereby the refrigerant pipe is accessible to a user to perform an operation of connecting or separating the refrigerant pipe to or from a the connection pipe connected to an the outdoor unit, and
• wherein an insertion portion is formed on the frame, and the holder plate is configured to be withdrawn from the insertion portion when the holder plate is detached from the hanger plate.