Ceiling concealed air-conditioning apparatus

1. A ceiling concealed air-conditioning apparatus comprising:

a box-shaped air-conditioning apparatus body having an open bottom; and

an exterior panel attached to a lower part of the air-conditioning apparatus body, wherein

the exterior panel comprises a panel body covering the open bottom of the air-conditioning apparatus body; and a panel unit removably attached to a lower part of the panel body,

the panel body includes an opening at an area where the panel unit is attached to the panel body, and further includes a string hanger to hang a string at a corner of the opening, the string hanger being integral with the panel body and protruding to an inside of the opening, and

the panel unit includes a holding part to hold the string on a surface of the panel unit facing the panel body, the holding part being integral with the panel unit, one end of a loop of the string being held by the holding part and an other end of the loop of the string being hung on the string hanger to connect the panel body and the panel unit with the string, and the opening is provided so as to face a working space of the air-conditioning apparatus body, wherein

a distance between a distal end of the string hanger and a face of the opening is larger than a diameter of the string under tension and smaller than a natural diameter of the string.

2. The ceiling concealed air-conditioning apparatus of claim 1 , wherein the string hanger comprises a first piece and a pair of second pieces, the first piece protruding from the corner of the opening to the inside of the opening, the pair of second pieces extending from a distal end of the first piece in opposite directions and then bent back.

3. The ceiling concealed air-conditioning apparatus of claim 1 , wherein the string hanger comprises a first piece and a second piece, the first piece protruding from the corner of the opening, the second piece being bent back from a distal end of the first piece.

4. A ceiling concealed air-conditioning apparatus comprising:

a box-shaped air-conditioning apparatus body having an open bottom; and

an exterior panel attached to a lower part of the air-conditioning apparatus body, wherein

the exterior panel comprises a panel body covering the open bottom of the air-conditioning apparatus body; and a panel unit removably attached to a lower part of the panel body,

the panel body includes an opening at an area where the panel unit is attached to the panel body, and further includes a string hanger to hang a string at a corner of the opening, the string hanger being integral with the panel body and protruding to an inside of the opening, and

the panel unit includes a holding part to hold the string on a surface of the panel unit facing the panel body, the holding part being integral with the panel unit, one end of a loop of the string being held by the holding part and an other end of the loop of the string being hung on the string hanger to connect the panel body and the panel unit with the string,

the panel body extends in a longitudinal direction of the air-conditioning apparatus body, the panel body includes an air inlet and a first air outlet at a center in a longitudinal direction of the panel body, the air inlet and the first air outlet extending in the longitudinal direction of the panel body and parallel to each other in a transverse direction of the panel body, and

the opening comprises two openings at respective longitudinal ends of the panel body.

5. The ceiling concealed air-conditioning apparatus of claim 4 , wherein

each of the two openings is rectangular, and

in each of the two openings, the string hanger is positioned at a corner formed by two faces of the opening among four inner faces thereof, one of the two faces being a face near and along a corresponding one of the longitudinal ends of the panel body, an other of the two faces being one of two faces being opposite to each other in the transverse direction of the panel body and closer to the first air outlet than an other of the two faces being opposite to each other in the transverse direction.

6. The ceiling concealed air-conditioning apparatus of claim 5 , wherein

the panel body includes a second air outlet located such that the air inlet is interposed between the first air outlet and the second air outlet in the transverse direction of the panel body, and

the string hanger comprises two string hangers, and, among the four inner faces of the opening, the string hangers are positioned at respective ends of the face near and along the corresponding one of the longitudinal ends of the panel body.

7. A ceiling concealed air-conditioning apparatus comprising:

a box-shaped air-conditioning apparatus body having an open bottom and extending in one direction; and

an exterior panel attached to a lower part of the air-conditioning apparatus body, wherein

the exterior panel comprises a panel body covering the open bottom of the air-conditioning apparatus body; and a panel unit removably attached to a lower part of the panel body,

the panel body includes an opening at an area where the panel unit is attached to the panel body, and further includes a string hanger to hang a string at a corner of the opening, the string hanger being integral with the panel body and protruding to an inside of the opening, and

the panel unit includes a holding part to hold the string on a surface of the panel unit facing the panel body, the holding part being integral with the panel unit, one end of a loop of the string being held by the holding part and an other end of the loop of the string being hung on the string hanger to connect the panel body and the panel unit with the string,

wherein the string hanger comprises a first piece and a second piece, the first piece protruding from the corner of the opening, the second piece being bent back from a distal end of the first piece,

wherein the holding part is positioned on the panel unit at a position satisfying a following relationship:

L<Lm<L+D

and

Lm>La

where: L is a distance between the distal end of the first piece of the string hanger and the holding part;

D is a distance, in a direction perpendicular to the first piece, between the distal end of the first piece of the string hanger and a face of the opening that is one of two faces of the opening to form the corner for the string hanger and faces the distal end of the second piece;

Lm is a length of the loop of the string; and

La is a length of overlap between the panel unit and the string in an up-down direction when the panel unit is suspended, wherein

a distance between a distal end of the second piece of the string hanger and a face of the opening that is one of two faces of the opening to form the corner and faces the distal end of the second piece is set larger than a diameter of the string under tension and smaller than a natural diameter of the string.