JPH1089815A - Heat exchanger and refrigerant resupplying method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of sealing a large quantity of a refrigerant therein even when power supply is interrupted and even in the case where an ambient temperature is at a predetermined level or below at which pump-down can not be performed, and reduce a quantity of the refrigerant to be resupplied in the case where the heat exchanger is displaced. SOLUTION: Each of on-off valves 12 to 15, to which refrigerant pipes 11 for connection are connected, are provided at each end of a refrigerant pipe 2 on the side of an indoor unit 1 and of a refrigerant pipe 4 on the side of an outdoor unit 3. When an air conditioner is moved, the on-off valves 12 to 15 are closed to seal a refrigerant into the refrigerant pipes 2, 4, and the refrigerant pipes 11 are removed. After moving the air conditioner, the refrigerant pipes 11 are connected, and the on-off valves 12 to 15 are opened. Then, a shortage of the refrigerant is replenished by a refrigerant supplying means 16 through the on-off valves 12, 15 which are three-port connection valves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger and a method for re-supplying a refrigerant when the heat exchanger is relocated, for buildings such as houses and buildings, trains, automobiles, and ships. Air conditioners, fish and shellfish,
It can be used for a heat exchange device such as a refrigerator for foods such as vegetables and meat, and a refrigerator (including a refrigerator for vehicles such as ships).

[0002]

BACKGROUND ART In a separate type air conditioner, which is a heat exchange device, two connecting refrigerant tubes are provided between an indoor unit and an outdoor unit, and an indoor heat exchanger is provided by these connecting refrigerant tubes. A refrigerant circulation path through which the refrigerant circulates is formed by connecting the refrigerant pipe on the indoor unit side and the refrigerant pipe on the outdoor unit side provided with the outdoor heat exchanger. In the refrigerant pipe on the outdoor unit side, two open / close valves are provided at both ends of the refrigerant pipe located upstream and downstream of the outdoor heat exchanger in the refrigerant flow direction.

When an air conditioner is under a lease contract or a rental contract, for example, the air conditioner is relocated from a relocation source building such as a temporary building at a construction site to a relocation destination building such as a temporary building at another construction site. Conventionally, when the separate type air conditioner is transferred in this manner, before the transfer, one of the two on-off valves provided in the refrigerant pipe on the outdoor unit side is closed and the other is opened, and the indoor unit is driven by the pump drive of the compressor. After the refrigerant in the refrigerant pipe on the unit side and the refrigerant in the connection refrigerant pipe are sucked and stored in the refrigerant pipe on the outdoor unit side, the other open / close valve is closed to stop the pump drive (pump down), and the connection refrigerant pipe is closed. The air conditioner was removed from the indoor unit and the outdoor unit and transported to the new building.

[0004]

However, this work method can be carried out only when electricity for pumping the relocation source building is supplied when the air conditioner is relocated. When the air conditioner is relocated, it is generally immediately before the construction and other projects are completed and the relocation building, such as a temporary building, is removed, and in many cases, the electricity of the relocation building is already Stopped, not energized.

[0005] Further, since the pump-down is performed by setting the air conditioner which can be switched between the cooling mode and the heating mode to the cooling mode, it is set so that the compressor is not overloaded when the environmental temperature is below a certain temperature. With some types of air conditioners, there is also a problem that it is not possible to perform pump down using a compressor when the environmental temperature is below a certain level.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat exchanger capable of containing a refrigerant in a refrigerant pipe on the indoor unit side and a refrigerant in a refrigerant pipe on the outdoor unit side even when the energization is stopped or when the environmental temperature is lower than a certain level. Providing an exchange device, and if the heat exchange device is relocated, most of the refrigerant at the source will be available at the destination, reducing the amount of refrigerant supplied to the air conditioner at the destination. It is an object of the present invention to provide a method of re-supplying a refrigerant in a heat exchange device.

[0007]

In order to achieve this object, a heat exchanger according to the present invention comprises a refrigerant pipe on the indoor unit side provided with an indoor heat exchanger and an outdoor pipe provided with an outdoor heat exchanger. The refrigerant pipe on the unit side is connected by two connecting refrigerant pipes to form a refrigerant circulation path for circulating the refrigerant, and the refrigerant pipe on the outdoor unit side is upstream and downstream of the outdoor heat exchanger in the refrigerant flow direction. In the heat exchange device in which two on-off valves are provided apart from each other, two on-off valves are provided in the refrigerant pipe on the indoor unit side on the upstream and downstream sides of the indoor heat exchanger in the refrigerant flow direction. It is characterized by having.

According to this, by closing all the on-off valves, the refrigerant on the indoor unit side can be maintained even when the power supply to the place where the heat exchange device is installed is stopped or when the environmental temperature is lower than a certain level. The refrigerant in the pipe and the refrigerant in the refrigerant pipe on the outdoor unit side can be confined.

In the above, all of the two on-off valves provided on the refrigerant pipes on the indoor unit side and the refrigerant pipes on the outdoor unit side, respectively, have a connection port with the refrigerant pipe and a connection port with the connection refrigerant pipe. Although it may be a two-port valve having at least one of these on-off valves, at least one on-off valve has a connection port with the refrigerant pipe, a connection port with the connection refrigerant pipe, and a connection port with the refrigerant supply means. When the heat exchange device is relocated, it is possible to supply insufficient refrigerant to the refrigerant circulation path from the on-off valve having the connection port, and the on-off valve has a refrigerant supply valve. Therefore, simplification of the refrigerant circulation circuit of the heat exchange device can be achieved.

[0010] Of the two on-off valves provided in the refrigerant pipe on the indoor unit side and the refrigerant pipe on the outdoor unit side, at least one of the on / off valves in the refrigerant pipe on the indoor unit side and the refrigerant pipe on the outdoor unit side is opened and closed. When the valve is a three-port valve having a connection port to the refrigerant pipe, a connection port to the connection refrigerant pipe, and a connection port to the refrigerant supply means, when the heat exchange device is relocated, The installation location of the indoor unit and the outdoor unit is restricted, and even if one of the indoor unit and the outdoor unit is installed in a place where it is difficult to connect the refrigerant supply means to the three-port valve, it is provided on the other. By connecting the refrigerant supply means to the three-port valve, the insufficient refrigerant can be reliably supplied to the refrigerant circulation path.

Further, at least one of the two on-off valves provided in the refrigerant pipe on the indoor unit side and the two on-off valves provided on the refrigerant pipe on the outdoor unit side is shared by the mounting bracket. When mounted in such a manner, management and handling of a pair of on-off valves becomes easy.

[0012] A method of re-supplying refrigerant in a heat exchange apparatus according to the present invention is characterized in that an end of a refrigerant pipe on the indoor unit side connected to a connecting refrigerant pipe installed between the indoor unit and the outdoor unit and the outdoor unit side. An open / close valve is provided at the end of the refrigerant pipe of the indoor unit, the open / close valve is closed before the transfer of the indoor unit and the outdoor unit, and then, the connection refrigerant pipe is removed from the indoor unit and the outdoor unit, and then the indoor unit is removed. And the outdoor unit to the transfer destination, connect the connecting refrigerant pipe to the indoor unit side refrigerant pipe and the outdoor unit side refrigerant pipe, open the open / close valve, and connect the indoor unit side refrigerant pipe ,
The present invention is characterized in that insufficient refrigerant is supplied to a refrigerant circulation path including a refrigerant pipe and a connecting refrigerant pipe on the outdoor unit side.

According to this method, since the indoor unit and the outdoor unit are transported from the transfer source to the transfer destination with the on-off valves closed, the refrigerant in the indoor unit-side refrigerant pipe and the refrigerant in the outdoor unit-side refrigerant pipe are exposed to the atmosphere. Only the refrigerant that was in the connecting refrigerant pipe is released without being released, and the amount of the refrigerant that must be supplied to the heat exchange device at the transfer destination is small.

In the above, the operation for supplying the insufficient refrigerant to the refrigerant circuit may be performed based on the calculated value from the capacity of the connecting refrigerant pipe.
It is preferable to perform the measurement while confirming that the temperature difference between the air inlet and the air outlet provided in the indoor unit becomes a specified value according to the capability of the heat exchange device.

In this way, when the heat exchanger is trial-operated to supply the insufficient refrigerant to the refrigerant circuit, even if the length of the connecting refrigerant pipe changes between the transfer source and the transfer destination, the heat exchange device can be used. The required amount of refrigerant can be reliably charged, and the temperature difference between the air suction port and the air outlet of the indoor unit can be confirmed, so that the heat exchange device can be reliably operated at a predetermined capacity.

In this refrigerant re-supply method, the point at which the insufficient refrigerant is supplied to the refrigerant circulation path may be a refrigerant pipe on the indoor unit side, a refrigerant pipe on the outdoor unit side, or a connecting refrigerant pipe. The on-off valve may be used.

The heat exchange apparatus and the method for re-supplying the refrigerant according to the present invention described above are applicable to various air conditioners for buildings such as houses and buildings, trains, automobiles, ships, aircrafts, etc. It can be used for refrigeration equipment for foods such as vegetables and meat, refrigeration equipment (including those for vehicles such as ships), and when the heat exchange equipment is an air conditioner, the indoor unit is a floor-standing type or ceiling. Any type such as a hanging type or a wall-mounted type may be used, and the air conditioner may be a multi-type.

Further, the present invention is not limited to the case where the heat exchange device is transferred, not only when the heat exchange device is directly transferred from the transfer source to the transfer destination, but also when the heat exchange device is transferred from the transfer source to a warehouse of a leasing company or a rental company. After that, it includes the case of sending to a relocation destination where a lease contract or rental contract has been established.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic diagram of a separate type air conditioner that is a heat exchange device. A refrigerant pipe 2 on the indoor unit 1 side is provided inside the indoor unit 1, and a refrigerant pipe 4 on the outdoor unit 3 side is provided inside the outdoor unit 3. In the refrigerant pipe 2 composed of the refrigerant gas pipe 2A and the refrigerant liquid pipe 2B, an expander 5 such as an expansion valve or a capillary tube, and an indoor heat exchanger 6 are arranged, and the refrigerant gas pipe 4A
Refrigerant pipe 4B and refrigerant liquid pipe 4B, compressor 7
And an outdoor heat exchanger 8. Then, the fans 9 and 10 are brought close to the indoor heat exchanger 6 and the outdoor heat exchanger 8.
Is provided. A cooling mode in which the indoor heat exchanger 6 becomes an evaporator and the outdoor heat exchanger 8 becomes a condenser by the four-way switching valve 7A is provided in the refrigerant pipe 4 on the outdoor unit 3 side, The mode is switched to a heating mode in which the indoor heat exchanger 6 is a condenser and the outdoor heat exchanger 8 is an evaporator.

A refrigerant pipe 11 for connection is provided between the indoor unit 1 and the outdoor unit 3, and a refrigerant gas pipe 2A for the indoor unit 1 and a refrigerant gas for the outdoor unit 3 are connected to the refrigerant pipe 11 for connection. Piping 4
A, and a connecting refrigerant gas pipe 11B connecting the refrigerant liquid pipe 2B on the indoor unit 1 side and the refrigerant liquid pipe 4B on the outdoor unit 3 side.

Refrigerant gas pipe 2A and connecting refrigerant gas pipe 11
A is via an on-off valve 12, and the connecting refrigerant gas pipe 11A and the refrigerant gas pipe 4A are on-off valve 13 via a refrigerant liquid pipe 4B.
The connection refrigerant liquid pipe 11B is connected via an on-off valve 14, and the connection refrigerant liquid pipe 11B and the refrigerant liquid pipe 2B are connected via an on-off valve 15, respectively. The on-off valves 12 and 15 are provided on the refrigerant pipe 2 on the indoor unit 1 side at a position upstream and downstream of the indoor heat exchanger 6 in the refrigerant flow direction, and the on-off valves 13 and 14 are provided on the outdoor unit 3 side. In the refrigerant pipe 4, the refrigerant pipe 4 is provided apart from the outdoor heat exchanger 8 on the upstream side and the downstream side in the refrigerant flow direction.

The on-off valves 13 and 14 are connected to the refrigerant gas pipe 1 for connection.
1A, connection ports 13A and 14A with the refrigerant liquid pipe 4B, and connection ports 13 with the refrigerant gas pipe 4A and the connection refrigerant liquid pipe 11B.
B and 14B, but the on-off valve 1
2 and 15 are connection ports 12A and 15A for the refrigerant gas pipe 2A and the refrigerant liquid pipe 2B, connection ports 12B and 15B for the connection refrigerant gas pipe 11A and the connection refrigerant liquid pipe 11B, and the refrigerant supply means 16. Is a three-port valve having connection ports 12C and 15C.

The refrigerant supply means 16 includes a refrigerant supply source 17 composed of a cylinder, a charge cylinder, and the like, a distribution pipe 18,
19, and the distal ends of the distribution pipes 18 and 19 are
Refrigerant supply port 1 connected to 15 connection ports 12C, 15C
8A and 19A.

FIG. 2 shows an on-off valve 12, 1 which is a three-port valve.
5 shows a specific structure. The on-off valves 12 and 15 have three connection ports 12A, 15A and 12B, 15B and 12C, 15
In addition to C, a tool insertion opening 12 for inserting a tool 21 such as a hexagon wrench for rotating the valve body 20 to move forward and backward.
D and 15D are provided, and when the cap 22 is removed and the valve body 20 is advanced by rotating the tool 22, the front end of the valve body 20 comes into contact with the valve seat 23, and the on-off valves 12, 15 are closed (connection port). 12A and 15A and the communication between 12B and 15B are cut off), and when the valve body 20 is retracted, the on-off valves 12 and 15 are opened.
Open (connection ports 12A and 15A communicate with 12B and 15B). A valve member 24 serving as a valve core is provided inside the connection ports 12C and 15C. When the cap 25 is removed and the refrigerant supply ports 18A and 19A of the refrigerant supply means 16 are connected to the connection ports 12C and 15C, the valve member 24 is opened. Is pressed by the refrigerant supply means 16 to the connection ports 12C, 1
5C, the refrigerant can flow into the valve member 24 when the refrigerant supply ports 18A, 19A and the like are removed.
Is configured to close the connection ports 12C and 15C with springs.

FIG. 3 shows the whole indoor unit 1 of a floor-standing type. An air inlet 26 and an air outlet 27 are provided on a front surface of the indoor unit 1, and a mounting bracket 28 is connected to a lower portion of a side surface by bolts or the like. On-off valves 12 and 15 which are three-port valves provided in the indoor unit 1 as a set of two are commonly mounted on the mounting bracket 28.

In the above, the refrigerant pipe 2 of the indoor unit 1, the refrigerant pipe 4 of the outdoor unit 3, and the connecting refrigerant pipe 11 shown in FIG. 1 form a refrigerant circulation path 29 of the air conditioner. .

When the air conditioner is to be transported to the transfer destination, first, the on-off valves 1 provided at the end of the refrigerant pipe 2 on the indoor unit 1 side and the end of the refrigerant pipe 4 on the outdoor unit 3 side.
Close 2-15. Thus, the refrigerant in the refrigerant pipe 2 on the indoor unit 1 side and the refrigerant in the refrigerant pipe 4 on the outdoor unit 3 side are confined.

Next, both ends of the connection refrigerant pipe 11 laid between the indoor unit 1 and the outdoor unit 3 are opened and closed by valves 12 to 15.
And the connection refrigerant pipe 11 is removed from the indoor unit 1 and the outdoor unit 3. Thereafter, the indoor unit 1 and the outdoor unit 3 are transported to the installation site of the transfer destination, the indoor unit 1 and the outdoor unit 3 are installed at predetermined locations, and the connection refrigerant pipes are connected to the on-off valves 12 and 13 and 14 and 15. 11 is connected. Then, the connection ports 12C and 15C of the on-off valves 12 and 15 are connected to the suction ports of the suction means such as a vacuum pump and the like. And the on-off valve 12,1
5, the refrigerant supply ports 18A, 19A of the refrigerant supply means 16 are connected to the connection ports 12C, 15C, the air conditioner is operated, and the refrigerant pipe 2 on the indoor unit 1 side and the outdoor unit 3 side, which are in communication, are connected. Insufficient refrigerant is supplied from the refrigerant supply means 16 to the refrigerant circulation path 29 including the refrigerant pipe 4 and the connection refrigerant pipe 11.

The operation of the air conditioner at this time is a test operation, and the test operation is performed while detecting the temperature difference between the air inlet 26 and the air outlet 27 of the indoor unit 1, and this temperature difference is used as the air conditioner. When the specified value is reached according to the capacity of the air conditioner, the test operation of the air conditioner is stopped, and the supply of the refrigerant from the refrigerant supply means 16 to the refrigerant circulation path 29 is stopped.
Then, the refrigerant supply ports 18A, 19A of the refrigerant supply means 16 are removed from the connection ports 12C, 15C of the on-off valve.

As a result, the amount of the insufficient refrigerant (the capacity of the connecting refrigerant pipe 11) accurately enters the refrigerant circulation path 29, and when the air conditioner is fully operated, the air conditioner has its original capacity. Demonstrate. Note that the temperature difference between the air inlet 26 and the air outlet 27 according to the capacity of the air conditioner is displayed in a manual or the like describing the capacity of the air conditioner, so it may be referred to. Then, the refrigerant is supplied to the refrigerant circulation path 29 until a temperature difference determined by the relation between the electric power supplied to the air conditioner, the electric current, the temperature of the outside air, the humidity and the like is generated in the air inlet 26 and the air outlet 27.

According to the above-described embodiment, the refrigerant in the refrigerant pipes 2 and 4 of the indoor unit 1 and the outdoor unit 3 can be confined by closing the on-off valves 12 to 15. In order to carry from the relocation source to the relocation destination, the inside of the refrigerant pipe 2 on the indoor unit 1 side and the refrigerant pipe 4 on the outdoor unit 3 side
Is transferred to the transfer destination as it is, and the amount of the refrigerant that must be supplied from the refrigerant supply means 16 at the transfer destination is the same as the internal capacity of the connecting refrigerant pipe 11,
This amount can be reduced.

The above operation can be performed even when the power supply to the transfer source is stopped, or when the environmental temperature is lower than or equal to a certain temperature at which pump down cannot be performed, or higher.

Further, the shortage of the refrigerant at the transfer destination is transferred to the refrigerant circuit 2.
The operation of supplying the air conditioner to the indoor unit 1
While checking that the temperature difference between the air inlet 26 and the air outlet 27 becomes a specified value according to the capacity of the air conditioner, the amount of the insufficient refrigerant can be accurately supplied to the refrigerant circulation path 29. In addition, even if the length of the connecting refrigerant pipe 11 changes between the transfer source and the transfer destination, the required amount of the refrigerant can always be supplied to the refrigerant circulation path 2 and the air conditioner can be operated with a predetermined capacity.

Further, the on-off valves 12 and 15 are three-port valves having connection ports 12C and 15C for the refrigerant supply means 16, and these on-off valves 12 and 15 also serve as refrigerant supply valves. The refrigerant pipe 2 on the first side, the refrigerant pipe 4 on the outdoor unit 3 side, and the connection refrigerant pipe 11 do not need to be provided with a connection portion with the refrigerant supply means 16. Therefore, the present invention can be implemented without major remodeling, and as a result, the structure can be simplified and the cost can be reduced.

Also, two units are provided in the indoor unit 1 as a set, and are connected to the end of the refrigerant gas pipe 2A and the end of the refrigerant liquid pipe 2B of the refrigerant pipe 2 on the indoor unit 1 side. Since the on-off valves 12 and 15 of the port valves are commonly mounted on the mounting bracket 28, the on-off valves 12 and 15 can be collectively arranged on the indoor unit 1 with the on-off valves 12 and 15 mounted on the mounting bracket 28. The management and handling of the on-off valves 12 and 15 can be facilitated.

The position where the on-off valves 12 and 15 are commonly mounted on the mounting bracket 28 and disposed on the indoor unit 1 is not limited to the side surface of the indoor unit 1, but is arbitrary depending on the shape and structure of the indoor unit 1. The location can be selected, and may be, for example, the inner bottom of the indoor unit 1. Further, the indoor unit 1 may be a ceiling-hanging type or a wall-hanging type instead of the floor-standing type.

FIG. 4 shows another embodiment of the present invention. In this embodiment, two on-off valves 3 provided in the outdoor unit 3 are provided.
0 and 31 are also 3-port valves. That is, all of the on-off valves 12, 15, 30, 31 are three-port valves.

The on-off valve 1 provided in the indoor unit 1 as described above
If the on-off valves 30, 31 provided in the outdoor unit 3 and the opening / closing valves 30, 31 provided in the outdoor unit 3 are three-port valves to which the refrigerant supply means 16 can be connected, one of the indoor unit 1 and the outdoor unit 3 becomes 3 Even if it is installed in a place where it is difficult to connect the refrigerant supply means 16 to the port valve, the refrigerant supply means 16 is connected to the three-port valve provided on the other side, so that the refrigerant is reliably supplied to the refrigerant circulation path 29. become able to.

In the above description, the air conditioner may be directly carried from the transfer source to the transfer destination. However, after closing the on-off valve to make the refrigerant pipes on the indoor unit side and the refrigerant pipes on the outdoor unit side airtight, a lease contract or the like is established. From the transfer source whose rental contract period has expired, it may be carried to the leasing company, the warehouse of the rental company, and then sent to the transfer destination where a new lease contract or rental contract has been established. Including.

Further, after the on-off valve is closed and the refrigerant pipe for connection is removed, when transported to a relocation destination, a warehouse of a leasing company or a rental company, a slight leakage of refrigerant from the on-off valve is also prevented. A leak prevention member such as a bonnet, washer, or cap nut may be attached to the connection port with the connection refrigerant pipe or the connection port with the refrigerant supply means.

[0041]

According to the present invention, the refrigerant in the refrigerant pipe on the indoor unit side and the refrigerant in the refrigerant pipe on the outdoor unit side of the heat exchange device can be maintained even when the energization is stopped or when the environmental temperature is below a certain level. When the heat exchange device is transferred, most of the refrigerant at the transfer source can be used at the transfer destination, and the refrigerant supplied to the heat exchange device at the transfer destination can be used. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating a refrigerant circuit of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a specific structure of the on-off valve which is the three-port valve shown in FIG.

FIG. 3 is an overall perspective view of the indoor unit.

FIG. 4 is a view similar to FIG. 1, showing another embodiment of the present invention.

[Description of Signs] 1 Indoor unit 2 Refrigerant piping on indoor unit side 2A Refrigerant gas piping 2B Refrigerant liquid piping 3 Outdoor unit 4 Refrigerant piping on outdoor unit side 4A Refrigerant gas piping 4B Refrigerant liquid piping 6 Indoor heat exchanger 7 Compressor 8 Outdoor heat exchanger 11 Refrigerant pipe for connection 11A Refrigerant gas pipe for connection 11B Refrigerant liquid pipe for connection 12, 15, 30, 31 On-off valve with 3-port valve 13, 14 On-off valve with 2-port valve 16 Refrigerant supply means 26 Air suction Mouth 27 Air outlet 28 Mounting bracket 29 Refrigerant circulation path

Claims (6)

[Claims] 1. A refrigerant pipe on an indoor unit side provided with an indoor heat exchanger and a refrigerant pipe on an outdoor unit side provided with an outdoor heat exchanger are connected by two connecting refrigerant pipes, and the refrigerant is connected. In a heat exchange device in which a refrigerant circulation path to be circulated is formed, and two on-off valves are provided on the refrigerant pipe on the outdoor unit side, separated from the outdoor heat exchanger on the upstream and downstream sides in the refrigerant flow direction.
A heat exchange device, wherein two on-off valves are provided in the refrigerant pipe on the indoor unit side on the upstream and downstream sides of the indoor heat exchanger in the refrigerant flow direction. 2. The heat exchange device according to claim 1, wherein
At least one of the on-off valves provided in each of the indoor unit-side refrigerant pipe and the outdoor unit-side refrigerant pipe has a connection port with the refrigerant pipe, and a connection refrigerant pipe. A three-port valve having a connection port with the refrigerant supply means and a connection port with the refrigerant supply means. 3. The heat exchange device according to claim 1, wherein
Opening and closing at least one of each of the two opening / closing valves provided in the indoor unit-side refrigerant pipe and the outdoor unit-side refrigerant pipe in the indoor unit-side refrigerant pipe and the outdoor unit-side refrigerant pipe The heat exchange device, wherein the valve is a three-port valve having a connection port with the refrigerant pipe, a connection port with the connection refrigerant pipe, and a connection port with the refrigerant supply unit. 4. The heat exchanger according to claim 1, wherein two on-off valves are provided on the refrigerant pipe on the indoor unit side and two on / off valves are provided on the refrigerant pipe on the outdoor unit side. A heat exchange device, wherein at least one of the on-off valves is commonly mounted on a mounting bracket. 5. An on-off valve is provided at an end of a refrigerant pipe on the side of the indoor unit and an end of a refrigerant pipe on the side of the outdoor unit which is connected to a refrigerant pipe for connection provided between the indoor unit and the outdoor unit. Before the transfer of the indoor unit and the outdoor unit, these on-off valves are closed, and thereafter, the work of removing the connection refrigerant pipe from the indoor unit and the outdoor unit is performed, and then the indoor unit and the outdoor unit To the relocation destination, connect the connection refrigerant pipe to the indoor unit side refrigerant pipe and the outdoor unit side refrigerant pipe, open the on-off valve, and connect the indoor unit side refrigerant in a communicating state. A refrigerant re-supply method for a heat exchange device, comprising supplying an insufficient refrigerant to a refrigerant circulation path including a pipe, a refrigerant pipe on the outdoor unit side, and the connection refrigerant pipe. 6. The refrigerant resupply method for a heat exchange device according to claim 5, wherein the operation of supplying a shortage refrigerant to the refrigerant circulation path includes a test operation of the heat exchange device and the provision of the refrigerant in the indoor unit. A method for re-supplying a refrigerant in a heat exchanger, wherein the method is performed while confirming that a temperature difference between an air inlet and an air outlet is a specified value according to the capacity of the heat exchanger.