JPH09133442A - Air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply discriminate false connection of a refrigerant piping to connect each indoor machine with an outdoor machine, in the arrangement of a multichamber type air-conditioner. SOLUTION: In a multichamber air-conditioner operable at each indoor machine, with on-off valves 7A, 7B, and 7C opened, a compressor 1 is operated and a refrigerant remaining in a refrigerant piping to an outdoor machine and an indoor machine and indoor heat-exchangers 6A, 6B, and 6C is recovered to the compressor 1 side. After the on-off valves 7A, 7B, and C are closed, on-off valves 5A, 5B, 5C, 7A, 7B, and 7C are opened classified by a refrigerant circuit. The temperature of an indoor heat-exchanger corresponding to an opening release valve is detected, and from a result of comparison between a detecting value and a preset set value, it is decided whether or not false connection exists in a refrigerant piping. When the false connection exists, abnormality is displayed by display means (11A, 11B, and 11C) of the corresponding indoor machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-room type air conditioner, and more particularly to a means for easily detecting an incorrect connection of a refrigerant pipe.

[0002]

2. Description of the Related Art There is a multi-room type air conditioner in which a plurality of indoor units are connected to one outdoor unit. FIG. 1 shows an example thereof, and the refrigerant discharged from the compressor 1 flows to the outdoor heat exchanger 3 via the four-way valve 2 during the cooling operation,
The four-way valve 2 is divided into a plurality of refrigerant circuits including the throttle means 4A, the opening / closing valve 5A, the indoor heat exchanger 6A, the opening / closing valve 7A, and the like.
The refrigerant to the indoor heat exchangers 6A, 6B and 6C is returned to the compressor 1 via the corresponding open / close valve 5A.
By turning on (opening) -7A, 5B-7B, 5C-7C, it is possible to freely circulate.

[0003]

By the way, in the multi-room type air conditioner as described above, as the number of indoor units increases, erroneous connection of the refrigerant pipes easily occurs. The incorrect connection of the refrigerant pipes can be found by trial operation, but it becomes difficult to find it when a plurality of indoor units are operated at the same time. Therefore, in the past, it was decided to operate the indoor units one by one, and in the case of cooling operation, to confirm that there is no misconnection in the refrigerant piping by checking the blowing of cold air, but the work is troublesome and time There was a problem of this. Therefore, it is an object of the present invention to provide an air conditioner in which misconnection of refrigerant pipes can be more easily understood.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and after the refrigerant discharged from the compressor is passed through at least the outdoor heat exchanger, the throttle means and the first means are provided. A multi-chamber type air conditioner configured to freely flow through a plurality of refrigerant circuits including an on-off valve, an indoor heat exchanger, and a second on-off valve, and to return the refrigerant circuit to the compressor. And the second on-off valve is opened for each refrigerant circuit, the temperature of the indoor heat exchanger corresponding to the opened on-off valve is detected, and the incorrect connection of the refrigerant pipe is detected from the comparison result between the detected value and the preset value. Make a decision and when an incorrect connection is detected,
An abnormality display is provided by the display means of the corresponding indoor unit.

[0005]

According to the above means, a plurality of indoor units are sequentially operated one by one, and the refrigerant pipes are connected to the refrigerant pipe based on the result of comparison between the temperature of the indoor heat exchanger detected during the operation and the preset value. It is determined whether there is an incorrect connection, and if there is an incorrect connection, an error display will be displayed on the indoor unit side display means, and it will be checked whether there is an incorrect connection in the refrigerant pipe without trouble. be able to.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the outline of a basic refrigeration cycle and its control system of a multi-room air conditioner, where 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant in accordance with the operation mode, and 3 is The outdoor heat exchangers 4A, 4B and 4C are throttle means 5A and 5 using capillary tubes or the like.
B and 5C are on-off valves, 6A, 6B and 6C are indoor heat exchangers,
7A, 7B and 7C are on-off valves, 8A, 8B and 8C are temperature sensors for detecting the temperatures of the indoor heat exchangers 6A, 6B and 6C, 9 is a compressor 1, a four-way valve 2, on-off valves 5A and 5B,
5C, 7A, 7B, 7C and an outdoor unit control unit 10A, 10B, 10C for controlling an outdoor blower (not shown)
Is an indoor unit controller provided in each indoor unit,
Reference numerals 1A, 11B and 11C denote display means (display portions) provided in the respective indoor units, and 12 denotes a start button for starting a series of control operations described below.

When the piping work for the refrigeration cycle as shown in FIG. 1 is completed, first, the start button 12 is operated to detect whether or not the refrigerant pipe is erroneously connected. Indicates that the corresponding display unit (11A, 11B, 11C) on the indoor unit side displays an abnormality. Hereinafter, this control operation will be described with reference to the flowchart of FIG. When the start button 12 is operated, the opening / closing valves 7A, 7B, 7C are opened in step ST1, the compressor 1 is turned on in step ST2, and the indoor heat exchangers 6A, 6B, 6C and the outdoor unit and each indoor unit ( Refrigerant remaining in the refrigerant pipe connected between the indoor heat exchangers) is collected on the compressor 1 side, and the opening / closing valves 7A, 7B, 7C are once closed in step ST3.

In the next step ST4, the indoor heat exchanger 6A
The on-off valves 5A and 7A corresponding to are opened to enter the cooling operation state, and the timer is started. Step ST5
Then, it is determined whether or not a predetermined time has elapsed, and when the predetermined time has elapsed, the temperature of the indoor heat exchanger 6A is detected in step ST6. In step ST7, it is judged whether or not the temperature of the indoor heat exchanger 6A is lower than a preset value (judgment reference value), and if it is low, it is considered that there is no misconnection of the refrigerant pipes and the operation can be normally performed. Although the process proceeds to ST9, if the detected value is higher than the set value, it is considered that there is an erroneous connection in the refrigerant pipe, and the process proceeds to step ST8 to display an abnormality on the display means 11A, and then proceeds to step ST9.

At step ST9, the on-off valves 5A and 7A are closed, while the on-off valves 5B and 7 corresponding to the indoor heat exchanger 6B are closed.
B is opened, and step ST5 to step ST described above
The work similar to the work in 7 is performed in steps ST10 to ST12, and it is determined whether or not the refrigerant pipe corresponding to the indoor heat exchanger 6B has an erroneous connection. If it is determined that there is no incorrect connection in the refrigerant pipe, the process proceeds to step ST14 as it is, but if it is determined that there is an incorrect connection, the process proceeds to step ST13 and the display means 11 is displayed.
An abnormality is displayed on B and the process proceeds to step ST14. In step ST14, while closing the opening / closing valves 5B and 7B, the opening / closing valves 5C and 7C corresponding to the indoor heat exchanger 6C are opened, and the same work as the work in steps ST5 to ST7 described above is performed in steps ST15 to ST1.
7 is performed, and it is determined whether the refrigerant pipe corresponding to the indoor heat exchanger 6C has an erroneous connection. Then, when it is considered that there is no erroneous connection in the refrigerant pipe, the series of operations described above ends, but when it is considered that there is an erroneous connection, the process proceeds to step ST18, and an abnormality is displayed on the display means 11C. Is to be done. The abnormality display is continuously displayed for a predetermined time.

[0010]

With the air conditioner having the check function as described above, whether or not there is an erroneous connection in the refrigerant pipe between the outdoor unit and each indoor unit can be easily performed with a single button operation. It is convenient because it can be distinguished into

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a refrigeration cycle of a multi-room type air conditioner according to the present invention and a conventional example, and a control system thereof.

FIG. 2 is a flowchart showing an embodiment of the present invention.

[Explanation of symbols]

 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4A Throttling means 5A Open / close valve 6A Indoor heat exchanger 7A Open / close valve 8A Temperature sensor 9 Outdoor unit control section 10A Indoor unit control section 11A Display means 12 Start button

Claims (5)

[Claims] 1. A plurality of refrigerants comprising a throttle means, a first opening / closing valve, an indoor heat exchanger, and a second opening / closing valve after the refrigerant discharged from the compressor is passed through at least the outdoor heat exchanger. In the multi-chamber type air conditioner, which is optionally circulated in a refrigerant circuit and returned to the compressor, the first and second
Open the on-off valve for each refrigerant circuit, detect the temperature of the indoor heat exchanger corresponding to the opened on-off valve, and determine the incorrect connection of the refrigerant pipe from the comparison result of the detected value and the preset value. An air conditioner characterized in that 2. When an incorrect connection of the refrigerant pipe is detected,
The air conditioner according to claim 1, wherein an abnormality is displayed by the display means of the corresponding indoor unit. 3. The air conditioner according to claim 1, wherein the abnormality display is continuously displayed for a predetermined time. 4. The refrigerant remaining in each of the indoor heat exchanger and the refrigerant pipe is recovered to the compressor side before opening the first and second opening / closing valves. Air conditioner. 5. The air conditioner according to claim 1, wherein a start button for starting the series of control operations is provided at a predetermined position of the indoor unit or the outdoor unit.