Disclosed herein is an indoor unit including: a load detector for detecting a heavy-load area to bear a relatively heavy air-conditioning load during a heating mode of operation and a light-load area to bear a lighter air-conditioning load than the heavy-load area from a perimeter zone of a space to be air-conditioned; and an air volume adjuster for setting the volume of air blown toward the light-load area to be lower than that of air blown toward the heavy-load area in a horizontal blowing mode. This allows the entire room, including the perimeter zone, to be air-conditioned efficiently during the heating mode of operation with temperature non-uniformity reduced in the room.

An indoor unit for an air-conditioning apparatus includes a main heat exchanger unit and a sub heat exchanger unit, the main heat exchanger unit includes a first main heat exchanger disposed at a front side of a case and a first heat-transfer pipe extending in a vertical direction, and a second main heat exchanger disposed at a back side of the case and a second heat-transfer pipe extending in the vertical direction. The sub heat exchanger unit includes a leeward-side first sub heat exchanger disposed at a leeward side of the first main heat exchanger and a heat-transfer pipe extending in a width direction, and a leeward-side second sub heat exchanger including a heat-transfer pipe extending in the width direction of the case. The leeward-side second sub heat exchanger has a lower end surface located above an air passage wall and is disposed at a leeward side of the second main heat exchanger.

A filter frame is removably attachable to a box fan. The filter frame is adapted for receiving a standard HVAC-style filter for removing contaminants from air flow induced by the fan. In this manner, a cost-effective means for filtering a flow of air is provided for residential and commercial settings. The filter frame is adaptable to a variety of standard box fan types of different styles and dimensions. The frame is configured to accommodate standard filters, such as those readily available from retail hardware stores and home centers.

The present invention comprises: a first filter, and a second filter positioned in the slipstream of the first filter in the airflow direction; a dust amount sensor positioned before the first filter in the airflow direction, having a hole part through which dust passes, and transmitting, per unit of time, each of a first total, which is the amount of dust in a first size range, and a second total, which is the amount of dust in a second size range smaller than the first size range, of the dust passing through the hole part; and a control unit for outputting the service signal of the first filter if the accumulated value of the first total transmitted from the dust amount sensor exceeds a first set value, and outputting the service signal of the second filter if the accumulated value of the second total transmitted from the dust amount sensor exceeds a second set value, wherein the optimum service time of each of the first filter and the second filter, which are capable of filtering dust of different sizes, can be independently calculated such that the unnecessary service of one of the first filter and the second filter can be blocked, and the optimum service time according to the indoor quality can be indicated.

An indoor unit for an air-conditioning apparatus includes a case, an air-sending fan, and a heat exchanger unit. The heat exchanger unit includes a plurality of heat-transfer pipes extending in a vertical direction and forming a plurality of refrigerant passages in a width direction of the case and an air flow direction, and a plurality of headers connected to both ends of the plurality of heat-transfer pipes to allow the refrigerant to flow between the plurality of heat-transfer pipes. The plurality of headers include a plurality of division headers dividing and connecting the plurality of heat-transfer pipes arranged in the air flow direction and connecting in parallel the plurality of heat-transfer pipes arranged in the width direction, and a return header connecting and turning back the plurality of divided refrigerant passages arranged in the air flow direction and connecting in parallel the plurality of heat-transfer pipes arranged in the width direction.

An air conditioning indoor unit includes a casing having an air outlet, a horizontal blade, a Coanda blade and a control unit. The horizontal blade changes an up and down direction flow of outlet air blown out from the air outlet. The Coanda blade cooperates with the horizontal blade in order to utilize the Coanda effect to change the outlet air to a Coanda airflow along a predetermined surface. The control unit changes postures of the Coanda blade and the horizontal blade to predetermined postures that change some of the outlet air to the Coanda airflow and do not change a remainder of the outlet air to the Coanda airflow.

A power conversion device includes an inverter configured by arms including phase upper-arm switching elements and phase lower-arm switching elements, a power-supply shunt resistor, lower-arm shunt resistors, and a control unit that generates drive signals corresponding to the phase upper-arm switching elements and the phase lower-arm switching elements from detection values of the voltage detectors. The power conversion device changes a ratio of time in which all of the upper-arm switching elements are in an ON state and time in which all of the lower-arm switching elements are in the ON state in one cycle of switching of the inverter according to a modulation ratio.

In order to carry out, in a heating operation, an airflow rate adjusting operation in which a reduced amount of conditioned air is blown in one or more of a plurality of blowing directions to increase a blowing speed in the rest of the blowing directions, an operation control section is configured to control the flow of the conditioned air such that the conditioned air is blown out in a horizontal blow mode in the blowing direction in which the blowing speed is increased by the airflow rate adjusting operation, and periodically change the blowing direction in which a reduced amount of the conditioned air is blown. As a result, temperature variations in the air-conditioning target space in the heating operation are reduced.

A stator for an electric motor includes: an annular lead wiring part attached to one axial end of the stator and routing a power lead to a winding of the stator; and a lead-out part provided on the radially outer side of the annular lead wiring part and leading out the power lead to the radial outside of the lead wiring part. The lead wiring part is formed such that the curvature of the inner diameter is different near the lead-out part compared with the remaining portion, and the radius of the inner diameter of the lead wiring part is largest at a portion other than near the lead-out part.

In an air-conditioning device, back flow is less likely to occur at an outlet port in relation to an inlet resistance, and the air-conditioning device includes: a main body having an inlet port and an outlet port; a cross-flow fan provided inside the main body; and a heat exchanger provided inside the main body, wherein the main body includes at least a front surface, a rear surface, an upper surface and a lower surface, the inlet port is formed in the upper surface, a ratio H/Df between the main body height dimension H and the fan outer diameter Df is 2.2 to 2.7, and an angle of inclination between a rear part of an front upward inclination section of the heat exchanger and a vertical direction is 30° to 45°.