Ceiling-embedded air conditioning indoor unit

1. A ceiling-embedded air conditioning indoor unit arranged to condition air in a space above a ceiling of an air conditioning target space and arranged to supply the conditioned air to the air conditioning target space, with the ceiling having a grid shaped frame, the ceiling-embedded air conditioning indoor unit comprising:

an indoor unit casing having

a side surface portion being rectangle shaped as seen in a plan view, the side surface portion having

a first side surface having a first suction port,

a second side surface opposing the first side surface and having a second suction port,

a third side surface, and

a non-suction side surface opposing the third side surface and having no suction port, and

an undersurface portion being rectangle shaped with each side being equal to or less than 600 mm long;

a fan placed inside the indoor unit casing to form an air flow leading from the first suction port and the second suction port to the blow-out port; and

a heat exchanger having a first part placed between the fan and the suction port,

an outer edge of the undersurface of the indoor unit casing being placed so as to be positioned on an inner side of an inner edge of the frame or so as to be along the frame,

a first portion of the heat exchanger adjacent the non-suction side surface being placed so as to become closer to the first side surface with increasing distance away from the non-suction side surface, and

a second portion of the heat exchanger adjacent the non-suction side surface being placed so as to become closer to the second side surface with increasing distance away from the non-suction side surface.

2. The ceiling-embedded air conditioning indoor unit according to claim 1 , wherein

the outer edge of the undersurface of the indoor unit casing is supported by the frame.

3. The ceiling-embedded air conditioning indoor unit according to claim 1 , wherein

the undersurface of the indoor unit casing is substantially square shaped.

4. The ceiling-embedded air conditioning indoor unit according to claim 1 , wherein

the ceiling has a ceiling panel placed such that an outer edge of the ceiling panel is positioned on the inner side of the inner edge of the frame or is along the frame, and

the outer edge of the undersurface of the indoor unit casing is placed so as to be positioned on an inner side of an edge of a cutaway portion of the ceiling panel or so as to follow the edge of the cutaway portion.

5. The ceiling-embedded air conditioning indoor unit according to claim 4 , wherein

the undersurface of the indoor unit casing includes an undersurface member positioned on a lower end of the indoor unit casing in an installed state and placed so as to face the air conditioning target space.

6. The ceiling-embedded air conditioning indoor unit according to claim 1 , wherein

the non-suction side surface has an access port that enables access to the inside of the indoor unit casing.

7. The ceiling-embedded air conditioning indoor unit according to claim 1 , wherein

the heat exchanger has a heat transfer pipe that extends from a first end to a second end, and

the first and second ends of the heat transfer pipe are disposed so as to penetrate the non-suction side surface.

8. The ceiling-embedded air conditioning indoor unit according to claim 1 , further comprising

an electrical component portion arranged and configured to perform drive control of at least the fan, the electrical component portion being placed on an outer side of the non-suction side surface and being fixed to the non-suction side surface.

9. The ceiling-embedded air conditioning indoor unit according to claim 1 , further comprising

a drain portion arranged to collect drain water arising in the heat exchanger, the drain portion penetrating the non-suction side surface and extending outward therefrom.

10. The ceiling-embedded air conditioning indoor unit according to claim 1 , further comprising an electrical component portion arranged and configured to perform drive control of at least the fan, an entirety of a side surface of the electrical component portion on a heat exchanger side being placed so as to be positioned on an upwind side of the heat exchanger in a state where the fan has been driven.

11. The ceiling-embedded air conditioning indoor unit according to claim 1 , wherein the indoor unit casing having an access port disposed so as to face a space positioned on a downwind side of the heat exchanger in a state where the fan has been driven to enable access to the inside of the indoor unit casing, the access port communicating with the space inside the heat exchanger through a gap in the heat exchanger.

12. The ceiling-embedded air conditioning indoor unit according to claim 1 , further comprising

a drain pipe arranged and configured to collect and drain water arising in the heat exchanger; and

an electrical component portion arranged and configured to perform drive control of at least the fan,

the heat exchanger having a heat transfer pipe that extends from a first end to a second end,

the indoor unit casing has a through surface with an access port formed therein to enable access to the inside of the indoor unit casing, and

the drain pipe penetrating the through surface, the heat transfer pipe penetrating the through surface, and the electrical component portion being mounted on the through surface.

13. The ceiling-embedded air conditioning indoor unit according to claim 1 , wherein

an axial direction of the fan is parallel to a perpendicular direction of the undersurface of the indoor unit casing, and

the fan is one of a turbo fan or a propeller fan.

14. The ceiling-embedded air conditioning indoor unit according to claim 13 , wherein

the fan is a turbo fan with an outer edge as seen in a top view placed on an inner side of the blow-out port.

15. The ceiling-embedded air conditioning indoor unit according to claim 1 , further comprising

a filter placed between the suction port and the heat exchanger,

the indoor unit casing having

a filter up-and-down accommodation opening arranged and configured so that the filter is insertable and removeable therein by sliding the filter up and down, and

a filter cover that covers the filter up-and-down accommodation opening.

16. The ceiling-embedded air conditioning indoor unit according to claim 1 , further comprising

a filter placed between the suction port and the heat exchanger,

the indoor unit casing having filter horizontal accommodation opening arranged and configured so that the filter is insertable and removeable therein by sliding the filter in a substantially horizontal direction.

17. The ceiling-embedded air conditioning indoor unit according to claim 1 , further comprising

two or more filters placed between the suction port and the heat exchanger in positions on at least two sides of four sides of a substantially quadrilateral shape as seen in a top view,

the undersurface of the indoor unit casing having a symmetrical shape as seen in a bottom view by having

filter up-and-down accommodation openings disposed below the two or more filters such that the filters become capable of being inserted and removed by sliding the filters up and down,

filter covers that cover the filter up-and-down accommodation openings,

an additional opening that is disposed below a portion configuring a side of the four sides of the substantially quadrangular shape on which the filters are not disposed and which is of a size equal to the filter up-and-down accommodation openings, and

an additional cover that covers the additional opening and is of a size equal to the filter covers.

18. The ceiling-embedded air conditioning indoor unit according to claim 1 , wherein

the heat exchanger is placed so as to surround a radial direction outer side of the fan with respect to an axis of rotation of the fan, and

a width of the heat exchanger in the radial direction with respect to the axis of rotation of the fan is shorter than a width of the heat exchanger in a vertical direction.