JP5026311B2 - Replacing the indoor unit of an air conditioner - Google Patents

Description

  The present invention relates to a method for replacing an indoor unit of an air conditioner installed on a ceiling.

  A conventional air conditioner includes an air conditioner body installed on the back of a ceiling, and a decorative panel that is exposed and disposed on the ceiling surface and has a suction port and a blowout port (for example, Patent Document 1). reference).

Japanese Patent Laid-Open No. 10-19365

  In a conventional air conditioner replacement operation, dust accumulated on the ceiling or the like is scattered over a wide area in the room when the decorative panel is removed and the air conditioner body is pulled out from the ceiling to the room. Therefore, even when the indoor daily work area for daily work is far from the installation location of the conventional air conditioner body, the daily work area is dusty during the replacement work of the conventional air conditioner. It was necessary to cover the daily work area with a sheet so as not to be contaminated. That is, there is a problem that during the replacement work of the conventional air conditioner, daily work cannot be performed indoors.

  The present invention has been made to solve the above-described problems, and suppresses dust scattering even during replacement work of an indoor unit of an air conditioner, thereby enabling daily work in a room where the indoor unit is installed. It aims at obtaining the replacement method of the indoor unit of an air conditioner.

The present invention relates to an indoor unit of an air conditioner, comprising: a main body installed on the back of the ceiling of a room; and a decorative panel that closes an installation port that is attached to the main body and opens and closes the main body opened in the ceiling A replacement work space isolation step that uses a work space isolation sheet to surround the space in the room immediately below the installation location of the decorative panel over the entire height direction and isolate it from other spaces in the room. Then, remove the decorative panel, take out the main unit from the installation port and remove the existing indoor unit, install the new main unit from the installation port to the ceiling, and install the new decorative panel into the new main unit And a new unit installation step of installing a new indoor unit by closing the installation port. And in the replacement work space isolation step, the floor protection sheet is laid in the area on the floor directly below the installation location of the decorative panel, and in the existing unit removal step, the air inside the work space isolation sheet is sucked, A vacuum cleaner that discharges the sucked air through the second HEPA filter while operating the negative pressure dust removing device that discharges the air sucked through the first HEPA filter to the outside of the work space isolation sheet . It is arranged inside the work space isolation sheet so that the discharged air is sucked into the negative pressure dust removing device, the dust adhering to the decorative panel and the main body is removed by the vacuum cleaner, Between the existing unit removing step and the new unit installing step, the negative pressure dust removing device removes dust in the installation space behind the ceiling where the new main body is installed. An installation space cleaning step of removing the installation space by the vacuum cleaner while operating, an installation space isolation step of isolating the installation space from other spaces behind the ceiling with an installation space isolation sheet, an inner surface of the work space isolation sheet, and the above A dust scattering preventing step of spraying a dust scattering preventing agent over the entire upper surface of the floor protection sheath .

  According to the present invention, dust can be prevented from being scattered outside the work space isolation sheet during the replacement operation of the indoor unit. Therefore, since the daily work area can be secured indoors even during the indoor unit replacement work, the daily work can be performed indoors.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram of a building in which an existing indoor unit to be replaced by an indoor unit replacement method for an air conditioner according to an embodiment of the present invention is installed. FIG. 2 is an enlarged view of a portion A in FIG. FIG. 4 is a diagram for explaining a replacement work space isolation step in the method for replacing an indoor unit of an air conditioner according to an embodiment of the present invention, and FIG. 4 is a replacement of the indoor unit of the air conditioner according to an embodiment of the present invention. The figure explaining the surface cleaning process of a method, FIG. 5 is the figure explaining the unit removal process of the replacement | exchange method of the indoor unit of the air conditioner based on one Embodiment of this invention, FIG. 6 is one Embodiment of this invention The figure explaining the installation space cleaning process of the indoor unit replacement | exchange method of the air conditioner which concerns on FIG. 7, FIG. 7 is the installation space isolation | separation process of the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention FIG. 8 is a diagram for explaining the dust scattering prevention process of the indoor unit replacement method for an air conditioner according to an embodiment of the present invention. FIG. 9 is an air conditioner according to an embodiment of the present invention. The figure explaining the replacement work space removal process of the indoor unit replacement | exchange method of this, FIG. 10 is a figure explaining the new unit installation process of the replacement | exchange method of the indoor unit of the air conditioner concerning one Embodiment of this invention.

  1 and 2, the building 1 has a room 3 on each of the first basement floor (B1) and the first floor (1F) to the third floor (3F). And the floor 6a of the room 3 of each floor or the floor 6b of the roof is comprised by the slab which consists of thick plates, such as concrete. And the ceiling back space 9 (ceiling back 9) is formed between each upper surface (back surface) of the ceiling 7 of the room 3 of each floor, and each lower surface (back surface) of the floor 6a (6b). An installation port 7 a that communicates the interior of the room 3 with the back space 9 is formed in a predetermined portion of the ceiling 7. A suspension bolt 10 for supporting an existing indoor unit 16A described below is suspended from the back surface of the floor 6a (6b).

  The air conditioner 15 includes a plurality of existing indoor units 16A (hereinafter referred to as indoor units 16A) provided for each room 3 on each floor, an outdoor unit 22 provided on the roof of the building 1, A refrigerant pipe 25 that connects between the unit 16A and the outdoor unit 22 is provided as a main configuration.

As shown in FIG. 2, each of the indoor units 16A has a main body 17 installed in the area of the ceiling back space 9 corresponding to the installation port 7a, and the surface of the ceiling 7 (ceiling) by closing the installation port 7a. And a decorative panel 19 having an indoor inlet (not shown) and an indoor outlet (not shown), which is attached to the main body 17 so as to be exposed to the surface 8). At this time, the main body portion 17 can be taken into and out of the ceiling space 9 from the installation port 7a.
Moreover, the main-body part 17 has the housing | casing 18 which has a ventilation path which leads from an indoor suction inlet to an indoor blower outlet. Further, although not shown in detail, the main body portion 17 is configured to suck the indoor heat exchanger disposed in the ventilation path in order to perform heat exchange between the refrigerant and the air in the chamber 3 or the air in the chamber 3. It has an indoor fan or the like for passing the portion where the indoor heat exchanger is disposed from the opening and guiding it to the indoor outlet.

Further, the mounting bracket 20 protrudes from the opposite side wall 18 a of the housing 18. The suspension bolt 10 is inserted into the mounting bracket 20, and a nut 21 is screwed to the tip of the suspension bolt 10. Thereby, the main-body part 17 is supported by the suspension bolt 10, and the lower surface of the housing | casing 18 is arrange | positioned in the position corresponding to the installation port 7a at this time. A predetermined gap is formed between the casing 18 and the edge of the installation port 7a, and the screwing of the nut 21 to the suspension bolt 10 can be released through this gap. Yes.
The decorative panel 19 is attached to the housing 18 from the inside of the chamber 3 using screws (not shown) or the like so that the edge of the decorative panel 19 surrounds the edge of the installation opening 7a and closes the installation opening 7a. It has been.

  The outdoor unit 22 includes a housing 23 having an outdoor suction port and an outdoor air outlet. Although not shown in detail, an air passage that leads from the outdoor air inlet to the outdoor air outlet is formed in the housing 23. Yes. Furthermore, although not shown in detail, the outdoor unit 22 has an outdoor heat exchanger disposed in the ventilation path for heat exchange between the refrigerant and the outside of the outdoor unit, a compressor for compressing the refrigerant, and an outdoor unit. The housing 23 has an outdoor fan or the like that guides air outside the unit 22 from the outdoor suction port to the outdoor air outlet through the portion where the outdoor heat exchanger is disposed.

  And the refrigerant | coolant piping 25 is arrange | positioned so that the main-body part 17 of the indoor unit 16A and the outdoor unit 22 may be connected, and a refrigerant | coolant can circulate through the refrigerant | coolant piping 25. FIG. At this time, a portion of the refrigerant pipe 25 on the indoor unit 16 </ b> A side is disposed in the ceiling space 9, and the connection between the refrigerant pipe 25 and the main body portion 17 is performed without exposing the refrigerant pipe 25 to the chamber 3. Yes. Further, a drain pipe (not shown) for guiding drain water generated in the main body 17 to the outside of the building 1 and an electric wiring (not shown) for supplying power to the main body 17 are also connected to the main body 17. Has been. At this time, drain piping and electrical wiring are also drawn into the main body portion 17 using the ceiling space 9.

Next, a method for replacing the indoor unit will be described.
3 to 10, the indoor unit replacement method is such that the space in the chamber 3 around the location where the decorative panel 19 of the indoor unit 16 </ b> A is disposed is replaced with another space in the chamber 3 using the work space isolation sheet 27. In order to install a new indoor unit 16B, a replacement work space isolation process for isolating the indoor unit 16A, a surface cleaning process for cleaning the vicinity of the exposed portion of the indoor unit 16A on the ceiling surface 8, an existing unit removing process for removing the indoor unit 16A And an installation space cleaning process for cleaning a portion of the ceiling space 9 around the installation space. Further, the indoor unit replacement method includes an installation space isolating step for isolating the installation space 9a of the ceiling back space 9 from other areas of the ceiling back space 9, and dust adhering to the work space isolation sheet 27 being re-scattered. A dust scattering prevention process for preventing, a replacement work space removing process for releasing isolation of the replacement work space by the work space isolation sheet 27, and a new unit installation process for installing a new indoor unit 16B.

Next, the replacement work space isolation step will be described in detail.
In FIG. 3, in the replacement work space isolation step, the floor protective sheet 26 is used to protect the surface of the floor 6a immediately below the installation position of the decorative panel 19, and the work space isolation sheet 27 is used to install the decorative panel 19. The replacement work space 24 is provided by isolating the space of the chamber 3 immediately below the other from the other spaces of the chamber 3. In FIG. 3, for convenience of explanation, the thicknesses of the floor protection sheet 26 and the work space isolation sheet 27 are exaggerated.

  First, an operator (not shown) lays the floor protection sheet 26 in a predetermined area on the floor 6 a centering on a portion directly below the installation location of the decorative panel 19. The floor protection sheet 26 is, for example, an extremely thin plastic sheet having a thickness of 0.08 mm, and the operator uses the floor protection sheet 26 in a stacked manner. The laying area of the floor protection sheet 26 on the floor 6a has a size that includes at least the decorative panel 19 when the decorative panel 19 is projected onto the floor 6a vertically below.

  Next, the worker prepares a plurality of work space isolation sheets 27. The work space isolation sheet 27 is the same as the plastic sheet used for the floor protection sheet 26. Then, the worker climbs up the stepladder 30 and temporarily fixes each of the work space isolation sheets 27 to the ceiling 7 so as to surround the decorative panel 19 on one edge side of the plurality of work space isolation sheets 27. Temporary fixing of the work space isolation sheet 27 to the ceiling 7 is performed by aligning a portion in the vicinity of one edge of each work space isolation sheet 27 with the ceiling surface 8, and further setting a stop pin 28 with the ceiling surface 8. This is done by inserting the space isolation sheet 27 into the ceiling 7.

  Then, the worker uses a tape (not shown) to cover between the entire one edge portion of the work space isolation sheet 27 and the ceiling surface 8. At this time, the other edge of the work space isolation sheet 27 is suspended on the floor 6a. One edge of each of the work space isolation sheets 27 is bent to the opposite side of the place where the indoor unit 16A is disposed, and the operator applies a tape from the outside of the replacement work space 24.

  Next, the worker attaches a tape between the adjacent edges of the work space isolation sheet 27 along the height direction. Thereby, a replacement work space 24 that surrounds the entire space in the height direction of the space immediately below the installation location of the decorative panel 19 is formed by each of the work space isolation sheets 27.

  Furthermore, an operator (not shown) moves into the replacement work space 24. At this time, the stepladder 30 and the vacuum cleaner 31 are also disposed in the replacement work space 24, and the negative pressure dust removing device 35 is disposed in the vicinity of the replacement work space 24.

  Next, the worker forms a dust removal device insertion hole (not shown) in one of the work space isolation sheets 27, and inserts the dust removal device suction port 35a side of the negative pressure dust removal device 35 into the dust removal device insertion hole. Further, the space between the insertion portion of the negative pressure dust removing device 35 into the replacement work space 24 and the edge of the dust removing device insertion hole is taped.

  Next, the worker bends the other edge (lower end side) of the work space isolation sheet 27 inward, and aligns the folded portion of the work space isolation sheet 27 with the floor protection sheet 26. Further, the operator inserts the stop pin 28 into the floor 6a through the floor protection sheet 26 and the work space isolation sheet 27, so that the other edge side of the work space isolation sheet 27 is placed on the floor 6a together with the floor protection sheet 26. Temporarily fix to. Then, the worker uses a tape (not shown) to cover between the entire other edge of each of the work space isolation sheets 27 and the floor protection sheet 26. Thereby, the replacement work space 24 surrounded by the work space isolation sheet 27 is isolated from other spaces in the chamber 3.

  Here, the negative pressure dust remover 35 discharges a large volume of air sucked from the dust remover suction port 35a to the outside from the dust remover exhaust port 35b, and the first HEPA filter is connected to the dust remover suction port 35a and the dust remover. It is arrange | positioned in the ventilation path | route between the apparatus exhaust ports 35b. The HEPA filter is a filter that collects fine particles contained in the air with high performance. As defined in JIS Z 8122, the HEPA filter has a collection rate of 99.97% or more with respect to fine particles having a particle diameter of 0.3 μm when an airflow of a rated air volume is passed.

Here, the vacuum cleaner 31 has a drive main body portion 32 having a cleaner exhaust port 32 a for releasing sucked air, and a hose 33 having one end connected to the drive main body portion 32. Air is sucked into the drive main body 32 together with dust from the vacuum cleaner suction port 33a at the end. Further, a second HEPA filter (not shown) for collecting the dust in the sucked air is disposed in the ventilation path in the drive main body 32.
Note that the first HEPA filter of the negative pressure dust removing device 35 is capable of collecting fine particles with higher performance than the second HEPA filter of the vacuum cleaner 31.

Next, asbestos used for the beams and columns of the building 1 will be described.
Conventionally, asbestos has been used by spraying on beams, pillars, and the like of the building 1 for fireproof coating and heat insulation. As is well known, if an operator inhales asbestos, health will be damaged.
The indoor unit 16A of the air conditioner 15 is often installed in a portion of the ceiling 7 that avoids columns and beams. However, considering that asbestos is mixed in the vicinity of the indoor unit 16A, the worker wears protective clothing and a protective mask from the following surface cleaning process. Wearing protective clothing may be performed from the surface cleaning step, but considering workability, the operator may wear protective clothing in advance at the start of the replacement work space isolation step.

Next, the surface cleaning process will be described in detail.
In FIG. 4, the worker 36 first arranges the vacuum cleaner 31 so that the cleaner exhaust port 32 a of the vacuum cleaner 31 faces the dust remover suction port 35 a of the negative pressure dust remover 35 with almost no gap. The dust removing device 35 is operated. At this time, the air inside the replacement work space 24 is sucked from the dust removing device suction port 35a and discharged to the outside of the replacement work space 24 through the first HEPA filter. Accordingly, the pressure inside the replacement work space 24 is lower than the pressure outside the replacement work space 24. Thus, even if there is a minute gap between the work space isolation sheet 27 and the ceiling surface 8 or between the work space isolation sheet 27 and the floor protective sheet 26 laid on the floor 6a, the gap The air inside the replacement work space 24 is not released to the outside. Further, the dust sucked into the negative pressure dust removing device 35 is collected by the first HEPA filter. That is, dust floating in the replacement work space 24 is not released to the outside of the replacement work space 24.

  Then, the worker 36 operates the vacuum cleaner 31 to go up to the stepladder 30 and sucks the surrounding air including the decorative panel 19. At this time, since the suction force of the vacuum cleaner 31 extends to the arrangement part of the lower portion of the main body portion 17 through the indoor suction port and the indoor outlet of the decorative panel 19, not only dust on the lower surface of the decorative panel 19 but also the main body Dust adhering to the lower part of the part 17 is also sucked into the drive main body part 32 together with air. Further, since the cleaner exhaust port 32a faces the dust remover suction port 35a without a gap, the air discharged from the cleaner exhaust port 32a is sucked into the negative pressure dust remover 35.

  At this time, the dust mixed in the air sucked into the drive main body 32 is collected by the second HEPA filter of the vacuum cleaner 31. As described above, dust floating in the replacement work space 24 is also collected by the first HEPA filter of the negative pressure dust removing device 35. In addition, since the first HEPA filter of the negative pressure dust removing device 35 is capable of collecting dust with higher performance than the second HEPA filter of the vacuum cleaner 31, dust having a small particle diameter is used. Even when it passes through the second HEPA filter of the vacuum cleaner 31, it is collected by the first HEPA filter of the negative pressure dust removing device 35.

Next, the existing unit removal process will be described in detail.
The worker 36 goes up to the stepladder 30 while operating the negative pressure dust removing device 35, removes the decorative panel 19 from the main body portion 17 and places it on the floor 6 a. Further, the worker 36 puts the hose 33 of the vacuum cleaner 31 in the gap between the installation port 7 a and the housing 18 and sucks up dust around the housing 18. Further, the worker 36 releases the connection between the refrigerant pipe 25, the drain pipe, and the electrical wiring and the main body portion 17. Then, the worker 36 removes the nut 21 screwed to the suspension bolt 10, and as shown in FIG. 5, takes out the main body portion 17 from the installation port 7 a into the chamber 3 and places it on the floor 6 a. In addition, illustration of the stepladder 30 is abbreviate | omitted in FIG.

Then, the worker 36 removes the dust adhering to the decorative panel 19 and the housing 18 with the vacuum cleaner 31. Further, the worker 36 also removes dust adhering to the protective clothing by the vacuum cleaner 31. Then, the worker 36 partially releases the separation between the inside and outside of the replacement work space 24 by the work space isolation sheet 27, and removes the decorative panel 19 and the main body 17 from the replacement work space 24.
At this time, only a part of the isolation inside and outside the replacement work space 24 is released, and the state in which the atmospheric pressure inside the replacement work space 24 is smaller than the outside is maintained by the operation of the negative pressure dust removing device 35. Therefore, dust floating in the replacement work space 24 is not scattered from the inside of the replacement work space 24 to the outside. Then, the worker 36 attaches a tape or the like to the portion of the work space isolation sheet 27 whose separation has been released, and again isolates the inside and outside of the replacement work space 24.

Next, the installation space cleaning process will be described in detail.
In FIG. 6, the worker 36 goes up to the stepladder 30 while operating the negative pressure dust removing device 35, and inserts the hose 33 of the vacuum cleaner 31 into the ceiling space 9 from the installation port 7 a. Then, the worker 36 removes dust adhering to the back surface of the floor 6a and the back surface of the ceiling 7 that form the part of the ceiling space 9 where the main body of the new indoor unit is disposed. Next, the worker 36 removes the dust attached to the protective clothing and the dust attached to the stepladder 30 and the vacuum cleaner 31 itself by the vacuum cleaner 31 and stops the operation of the vacuum cleaner 31.

Next, the installation space isolation step will be described in detail.
The operator 36 prepares a plurality of installation space isolation sheets 37. The worker 36 prepares the installation space isolation sheet 37 in the vicinity of the replacement work space 24 in advance, partially releases the internal and external isolation of the replacement work space 24 by the work space isolation sheet 27, and installs the installation space. The isolation sheet 37 is taken into the replacement work space 24. Then, the worker 36 attaches a tape or the like to the portion of the work space isolation sheet 27 whose separation has been released, and again isolates the inside and outside of the replacement work space 24.

  Then, the operator 36 stops the operation of the negative pressure dust removing device 35 and the floor 6a so that one edge side of the installation space isolation sheet 37 surrounds a part of the back surface of the floor 6a facing the installation port 7a. Paste the back of the tape with tape. At this time, the worker 36 bends one edge side to the installation port 7a side, and the area between each one edge part of the installation space isolation sheet 37 and the floor 6a is covered with tape.

  In addition, the worker 36 forms a drawing hole (not shown) for drawing the refrigerant pipe 25, the drain pipe, and the electric wiring in the installation space isolation sheet 37, and the refrigerant pipe 25, the drain pipe, and the electric wiring. Is inserted through the lead-in hole. Then, a space is inserted between the refrigerant pipe 25, the drain pipe, and the electrical wiring through the installation space isolation sheet 37 and the edge of the drawing hole of the installation space isolation sheet 37 with a tape. At this time, the other edge side of each of the installation space isolation sheets 37 is suspended from the back surface of the ceiling 7 so as to surround the installation port 7a.

Further, the operator 36 bends the other edge side of the installation space isolation sheet 37 to the installation port 7a side, and uses a tape between the entire area of the other edge of the installation space isolation sheet 37 and the back surface of the ceiling 7. It is eye-catching.
As a result, as shown in FIG. 7, the installation space 9 a of the ceiling back space 9 where a new indoor unit is to be installed is isolated from other areas of the ceiling back space 9. That is, the dust adhering to the back surface of the floor 6a and the back surface of the ceiling 7 forming the ceiling space 9 that has not been cleaned does not scatter into the chamber 3 from the installation port 7a.

  Then, the worker 36 partially releases the separation inside and outside of the replacement work space 24 by the work space isolation sheet 27, removes the stepladder 30 and the vacuum cleaner 31 to the outside of the replacement work space 24, and then again the replacement work space. Isolate the inside and outside of 24. Further, the tape that has been patched between the negative pressure dust remover 35 and the edge of the dust remover insertion hole is peeled off, and the dust remover suction port 35 a side is moved away from the work space 24. The dust removing device insertion hole is closed with the rest of the installation space isolation sheet 37 and the like.

Next, the dust scattering prevention process will be described in detail with reference to FIG.
In the dust scattering prevention process, the dust scattering preventing agent is sprayed on the upper surface of the floor protection sheet 26 and the inner surface of the work space isolation sheet 27 using the scattering preventing agent spraying device 40. The anti-scattering agent spraying device 40 includes a tank 41 for storing liquid dust anti-scattering agent, a tube 42 connected at one end to the tank 41, and pressurizing the inside of the tank 41 to apply dust anti-scattering agent from the other end of the tube 42. An electric pump 43 is provided for spraying. The operation of the electric pump 43 can be arbitrarily performed by the operator 36 by a switch (not shown) attached to the tip of the tube 42.

In addition, the anti-scattering agent spraying device 40 is prepared in the vicinity of the replacement work space 24 in advance, and the worker 36 partially releases the internal and external isolation of the replacement work space 24 and replaces the tube 42. By drawing in, it becomes possible to disperse the dust scattering inhibitor.
By dispersing the dust scattering preventive agent over the upper surface of the floor protection sheet 26 and the entire inner surface of the work space isolation sheet 27, the dust attached to the floor protection sheet 26 and the work space isolation sheet 27 is separated from the floor protection sheet 26 and the work space. It will not be scattered again from the sheet 27.

Next, the replacement work space removal process will be described.
The worker 36 releases the fixing of the work space isolation sheet 27 and the floor protection sheet 26 fixed to the ceiling 7 or the floor 6a to the ceiling 7 and the floor 6a. That is, the worker 36 peels off the tape covering the space between the work space isolation sheet 27 and the floor protection sheet 26, and further stops the work space isolation sheet 27 and the floor protection sheet 26 fixed to the floor 6a. Remove pin 28. Next, the worker 36 peels off the tape covering the space between the work space isolation sheet 27 and the ceiling surface 8, and further removes the fixing pin 28 that has fixed the work space isolation sheet 27 to the ceiling 7. Then, the worker 36 removes the work space isolation sheet 27 and the floor protection sheet 26 as shown in FIG.

  The disposal of the removed floor protection sheet 26 and the work space isolation sheet 27 is entrusted to a specialist who can handle asbestos. Similarly, disposal of dust collected by the second HEPA filter of the vacuum cleaner 31 and the first HEPA filter of the negative pressure dust removing device 35 is entrusted to a specialist. In a building where asbestos is not sprayed on the beams and pillars, it is not necessary to entrust the floor protection sheet 26, the work space isolation sheet 27, and the collected dust to a specialist.

Next, the new unit installation process will be described with reference to FIG.
In the new unit installation process, the worker 36 carries the main body 17 of the new indoor unit 16B having the same configuration as the indoor unit 16A to the installation space 9a. Then, the operator 36 inserts the suspension bolt 10 into the mounting bracket 20 and screws the nut 21 onto the tip of the suspension bolt 10. As a result, the new main body 17 is installed in the ceiling space 9. Furthermore, the worker 36 connects the refrigerant pipe 25, the drain pipe, and various electric wirings with the main body portion 17 using a gap between the housing 18 and the installation port 7 a. Then, the worker 36 attaches the new decorative panel 19 to the housing 18 of the main body portion 17 to close the installation port 7a, and finishes the installation operation of the new indoor unit 16B.

  According to the method for replacing an indoor unit of the air conditioner 15 according to the present invention, the height of the space in the chamber 3 immediately below the installation position of the decorative panel 19 is increased by using the work space isolation sheet 27 in the replacement work space isolation step. Surrounding the entire area of the direction, it is isolated from the other spaces of the chamber 3. In addition, after removing dust around the decorative panel 19 in the surface cleaning process, in the existing unit removal process, the vacuum cleaner is operated while operating the negative pressure dust removing device to keep the pressure in the replacement work space 24 lower than the external pressure. The dust adhering to the main body 17 and the decorative panel 19 removed using the machine 31 is removed. Further, in the installation space cleaning step, dust in the installation space 9 a of the ceiling 9 where the new main body portion 17 is installed is removed by the vacuum cleaner 31. In the installation space isolation step, the installation space 9a is isolated from other areas of the ceiling space 9 using the installation space isolation sheet 37. Further, in the dust scattering prevention process, after the dust adhesion preventing material is sprayed on the floor protection sheet 26 and the work space isolation sheet 27 to prevent the dust adhering to the floor protection sheet 26 and the work space isolation sheet 27 from scattering again. In the replacement work space removal step, the floor protection sheet 26 and the work space isolation sheet 27 are removed, and the new indoor unit 16B is installed in the installation space 9a.

  For this reason, even when the decorative panel 19 of the indoor unit 16A of the air conditioner 15 is removed and the main body portion 17 is taken out from the installation opening 7a into the room 3, the dust accumulated in the ceiling space 9 remains in the replacement work space 24. It stays and is prevented from being scattered in the chamber 3 outside the replacement work space 24. Further, when the floor protection sheet 26 and the work space isolation sheet 27 are removed, the dust is not separated from the floor protection sheet 26 and the work space isolation sheet 27 and scattered. Further, when the new indoor unit 16 </ b> B is installed, dust is not scattered from the ceiling back space 9 into the room 3. Therefore, it is not necessary to cover the surface of the floor 6a in the chamber 3 except for the area immediately below the location where the indoor unit 16A is disposed during replacement work of the indoor unit of the air conditioner 15. That is, since the daily work area for performing daily work can be secured in the room 3, it is possible to perform the daily work in the room 3 even while the indoor unit is being replaced.

  Even if the asbestos is in the ceiling space 9 near the installation of the indoor unit 16A, the existing indoor unit 16A can be replaced with a new indoor unit 16B without scattering the asbestos into the room 3. .

  The law stipulates that full-scale removal and containment of asbestos can only be performed by qualified specialists. Before the replacement of the indoor unit 16A, if the asbestos is to be removed or contained in the entire asbestos wall of the ceiling space 9, it must be entrusted to a specialist, which is very expensive. Cost is required.

  On the other hand, according to the present invention, it is possible to replace the indoor unit 16A with a new one without particularly performing full-scale removal and containment of asbestos. In this case, in consideration of a case where asbestos is mixed in the vicinity of the indoor unit 16A, the floor protection sheet 26, the work space isolation sheet 27, and the dust collected by the vacuum cleaner 31 and the negative pressure dust removing device 35 are collected. All you need to do is entrust the processing to a specialist. Therefore, according to the present invention, an indoor unit can be exchanged at low cost even for a building in which asbestos may be mixed in the ceiling space 9 near the installation of the indoor unit 16A.

  In the present invention, the surface cleaning process is described as being provided, but the surface cleaning process is not necessarily provided. If a large amount of dust falls due to the removal of the indoor unit 16A in the existing unit removal step without performing the surface cleaning step, the dust may be removed from the floor protection sheet 26 using the vacuum cleaner 31.

  In addition, although the installation space isolation process has been described as being provided, the installation space isolation process is not necessarily required as long as it is a building in which asbestos is not sprayed on beams or pillars and the environment of the room 3 is allowed to scatter a small amount of dust. There is no need to provide. Further, the dust scattering prevention process may be such that the vacuum cleaner 31 wipes off the dust on the floor protection sheet 26 and the work space isolation sheet 27 as long as the environment of the chamber 3 where a small amount of dust is allowed to be scattered.

  Furthermore, if the building does not use asbestos, in the replacement work space removal step, the floor protection sheet 26 and the work space isolation sheet 27 are replaced, the surface on the replacement work space 24 side is folded inward, If the dust is prevented from scattering, the dust scattering prevention process is not necessarily provided. Further, the indoor unit 16A removed in the existing unit removal step and placed on the floor 6a may be left as it is until the replacement work removal step. In this case, in the replacement work space removal step, if the floor protection sheet 26 and the work space isolation sheet 27 are included in the indoor unit 16A on the surface side of each replacement work space 24, dust is scattered into the chamber 3. The indoor unit 16A can be removed without causing it.

  In the replacement work space isolation step, the floor protection sheet 26 is installed on the floor 6a. However, the floor protection sheet 26 is not necessarily installed. For example, in the installation space isolation step, after the dust around the ceiling space 9 where the new indoor unit 16B is disposed is removed, the dust that has fallen on the floor 6a surrounded by the work space isolation sheet 27 can be cleaned cleanly. If it is a thing, it is not necessary to lay the floor protection sheet 26 in particular.

  Further, although the replacement work space removal process is described as being provided between the dust scattering prevention process and the new unit installation process, the dust is removed from the floor protection sheet 26 and the work space isolation sheet 27 after the dust scattering prevention process. Therefore, the replacement work space removal step may be provided after the new unit installation step.

It is a schematic diagram of the building where the existing indoor unit replaced by the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention was installed. It is the A section enlarged view of FIG. It is a figure explaining the replacement work space isolation | separation process of the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention. It is a figure explaining the surface cleaning process of the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention. It is a figure explaining the unit removal process of the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention. It is a figure explaining the installation space cleaning process of the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention. It is a figure explaining the installation space isolation | separation process of the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention. It is a figure explaining the dust scattering prevention process of the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention. It is a figure explaining the exchange work space removal process of the exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention. It is a figure explaining the new unit installation process of the replacement | exchange method of the indoor unit of the air conditioner which concerns on one embodiment of this invention.

Explanation of symbols

  3 rooms, 6a, 6b floor, 7 ceiling, 7a installation port, 9 ceiling back, 9a installation space, 15 air conditioner, 16A existing indoor unit, 16B new indoor unit, 17 main body, 19 decorative panel, 26 floor Protective sheet, 27 Work space isolation sheet, 31 Vacuum cleaner, 35 Negative pressure dust remover.

Claims (1)

An indoor unit of an air conditioner comprising: a main body portion installed on a ceiling of a room; and a decorative panel that closes an installation port that is attached to the main body portion and is opened in the ceiling. A replacement method,
A replacement work space isolation step that surrounds the entire space in the height direction and isolates it from other spaces in the room, using a work space isolation sheet,
Removing the decorative panel, removing the existing indoor unit by taking out the main body from the installation port, and an existing unit removing step;
A new unit installation process in which a new main body is installed on the back of the ceiling from the installation opening, a new decorative panel is attached to the new main body, the installation opening is closed, and a new indoor unit is installed. With
In the replacement work space isolation step, a floor protection sheet is laid in the area on the floor directly below the installation location of the decorative panel,
In the existing unit removing step, while operating a negative pressure dust removing device that sucks air inside the work space separation sheet and discharges the air sucked through the first HEPA filter to the outside of the work space separation sheet. A vacuum cleaner that discharges the sucked air through the second HEPA filter is disposed inside the work space isolation sheet so that the discharged air is sucked into the negative pressure dust removing device, and the vacuum cleaner Remove dust adhering to the decorative panel and the main body by a machine,
Between the existing unit removal process and the new unit installation process,
An installation space cleaning step of removing dust in the installation space behind the ceiling where the new main body is installed by the vacuum cleaner while operating the negative pressure dust removing device;
An installation space isolation step of isolating the installation space from other spaces behind the ceiling with an installation space isolation sheet;
A dust scattering prevention step of spraying a dust scattering prevention agent over the entire inner surface of the work space isolation sheet and the upper surface of the floor protection sheet;
A method for replacing an indoor unit of an air conditioner, comprising:

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