An air conditioner may include: an outdoor unit including a compressor and an outdoor heat exchanger; a first indoor unit including a first indoor heat exchanger; and a second indoor unit including a second indoor heat exchanger and an indoor expansion valve, wherein the outdoor unit includes: a first outdoor pipe, an outdoor expansion valve provided in the first outdoor pipe, the first outdoor pipe allowing a refrigerant discharged from the outdoor heat exchanger to pass through the outdoor expansion valve and flow to the first indoor unit; and a second outdoor pipe allowing a refrigerant discharged from the outdoor heat exchanger to bypass the outdoor expansion valve and flow to the second indoor unit.

An air conditioner may include: an outdoor unit including a compressor and an outdoor heat exchanger; a first indoor unit including a first indoor heat exchanger; and a second indoor unit including a second indoor heat exchanger and an indoor expansion valve, wherein the outdoor unit includes: a first outdoor pipe, an outdoor expansion valve provided in the first outdoor pipe, the first outdoor pipe allowing a refrigerant discharged from the outdoor heat exchanger to pass through the outdoor expansion valve and flow to the first indoor unit; and a second outdoor pipe allowing a refrigerant discharged from the outdoor heat exchanger to bypass the outdoor expansion valve and flow to the second indoor unit.

An air conditioner includes a cabinet including a front opening provided at a front surface thereof and a rear opening provided at a rear surface thereof; a heat exchanger provided inside the cabinet; a plurality of fans provided inside the cabinet and configured to allow air to pass through the heat exchanger; and a processor configured to control the plurality of fans so that in a cooling operation mode and a dehumidification operation mode, the plurality of fans are rotated in one direction so that the air is sucked through the rear opening, passes through the heat exchanger, and then is discharged through the front opening, and in an automatic cleaning operation mode, the plurality of fans are rotated in an opposite direction so that the air is sucked through the front opening, passes through the heat exchanger, and then is discharged through the rear opening.

An air conditioner and a communication method for an air conditioner are provided. The air conditioner may include an outdoor unit; an indoor unit; and a central controller connected to the indoor unit through a communication line. The indoor unit may perform periodic communication for transmitting a plurality of periodic packets to at least one of the outdoor unit or the central controller at predetermined periods, and change and transmit the plurality oaf periodic packets so as to decrease a load on the communication line.

A control method includes, after a multi-split air conditioner starts to operate in a heating mode, determining a target room from a plurality of rooms for which the multi-split air conditioner provides air conditioning, obtaining an indoor temperature of the target room, determining whether the indoor temperature of the target room is greater than a target temperature corresponding to the target room, and, in response to a determination that the indoor temperature of the target room is greater than the target temperature, controlling the multi-split air conditioner to switch an operation mode of a target indoor unit corresponding to the target room from the heating mode to a cooling mode.

A control method includes, after a multi-split air conditioner starts to operate in a heating mode, determining a target room from a plurality of rooms for which the multi-split air conditioner provides air conditioning, obtaining an indoor temperature of the target room, determining whether the indoor temperature of the target room is greater than a target temperature corresponding to the target room, and, in response to a determination that the indoor temperature of the target room is greater than the target temperature, controlling the multi-split air conditioner to switch an operation mode of a target indoor unit corresponding to the target room from the heating mode to a cooling mode.

When refrigerant gas leaks in an indoor unit, the leaked refrigerant gas locally accumulates in an area of the indoor space.

This air conditioner includes an indoor unit having one or more outlets, and an outdoor unit connected to the indoor unit, wherein a flammable refrigerant or a mildly flammable refrigerant is used. The air conditioner includes a refrigerant gas sensor disposed in the indoor unit. When refrigerant gas is detected by the refrigerant gas sensor, a control is performed such that air is blown from the one or more outlets at a minimum air speed or higher, said minimum air speed being preset in accordance with the rated cooling capacity of the air conditioner.

In an indoor unit of an air-conditioning apparatus according to the present invention, an air inlet for room air is provided at a position lower than a height position of a drain pan. A partition plate is provided to partition a space below a height position of the drain pan in a housing. A pipe connecting portion connected to a refrigerant pipe of an outdoor unit is provided in one part of the partitioned space and a heat exchanger and a fan are placed in the other part of the partitioned space. At least one communicating path is formed in the partition plate to communicate the two parts of the partitioned space with each other.

An HVAC system is provided. Embodiments of the present disclosure generally relate to heat exchangers having tubing with a reduced diameter compared to traditional systems. In one embodiment, a ducted HVAC system comprises an outdoor heat exchanger with tubing that has an outer diameter of eight millimeters (8 mm) or less and an indoor heat exchanger with tubing that has an outer diameter of nine millimeters (9 mm) or less. Additional systems, devices, and methods are also disclosed.

A fan motor for an air conditioner includes a rotor shaft, a plurality of rotor cores arranged in a circumferential direction about a center of the rotor shaft, a bridge configured to couple the rotor cores, permanent magnets coupled to the plurality of rotor cores, and an insert-injected rotor body provided in a space formed through the rotor shaft, the rotor cores, the bridge, and the permanent magnets. A cable holder for the fan motor includes an upper cable holder in which a plurality of protrusion walls are formed downwardly, a lower cable holder in which a plurality of guide walls coupled between the plurality of protrusion walls are formed upwardly, and a soldering land which is formed in a lower portion of the lower cable holder and upon which a wire can be soldered.