JP2011149622A

JP2011149622A - Air conditioner

Info

Publication number: JP2011149622A
Application number: JP2010011419A
Authority: JP
Inventors: Kenichi Takano; 賢一高野
Original assignee: Fujitsu General Ltd
Current assignee: Fujitsu General Ltd
Priority date: 2010-01-21
Filing date: 2010-01-21
Publication date: 2011-08-04

Abstract

<P>PROBLEM TO BE SOLVED: To securely determine the opening/closing state of operation valves during installation work regardless of the state of a heat exchange temperature sensor on the indoor unit side and the communication state between an outdoor unit and indoor units. <P>SOLUTION: In this multi-type air conditioner, the outdoor unit X and the indoor units A-C are interconnected via connection pipes 380-430. The outdoor unit X includes: liquid pipe temperature sensors St5, St7, St9 detecting temperatures of branch liquid pipes 200-220; gas pipe temperature sensors St6, St8, St10 detecting temperatures of branch gas pipes 290-310; and an operation valve opening/closing state determinator 440 calculating each of detected temperature differences between the temperatures of the branch liquid pipes 200-220 and the temperatures of the branch gas pipes 290-310 based on each detected temperature by the liquid pipe temperature sensors St5, St7, St9 and the gas pipe temperature sensors St6, St8, St10 during operation, and determining that the operation valves 260-280, 320-340 are closed when the respective detected temperature differences are a reference value or lower. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、空気調和機に関し、操作弁の開閉状態を判定するものに関する。 The present invention relates to an air conditioner, and relates to an apparatus for determining an open / close state of an operation valve.

従来から、空気調和機の据付作業が完了した後、その空気調和機を試運転して操作弁の開閉状態を判定し、工事ミスがないか否かを据付作業者に知らせる機能を備えた空気調和機が知られている。この機能を備えた空気調和機には、例えば、図４に示すように、圧縮機１、四方弁２、室外熱交換器１４、操作弁３、操作弁１１を備えた室外ユニットＯと、室内熱交換器６を備えた室内ユニットＩとを接続配管４、１０を介して接続する空気調和機がある。 Conventionally, after the installation work of the air conditioner has been completed, the air conditioner has a function to test the air conditioner to determine the open / close state of the operation valve and to inform the installation operator whether there is any construction error. The machine is known. For example, as shown in FIG. 4, the air conditioner having this function includes an outdoor unit O including a compressor 1, a four-way valve 2, an outdoor heat exchanger 14, an operation valve 3, and an operation valve 11, There is an air conditioner that connects an indoor unit I including a heat exchanger 6 via connection pipes 4 and 10.

ところで、室外ユニットＯは、冷媒回路内に冷媒を封入して操作弁３、操作弁１１を閉じた状態で、室内ユニットＩは、接続配管４、１０が接続された状態でそれぞれ工場から出荷される。このような工場から出荷された状態の室外ユニットＯ及び室内ユニットＩを所定の場所に据付けた後、接続配管４、１０をフレアナットを介して操作弁３、操作弁１１に接続し、次いで、操作弁３、操作弁１１を開くことで据付作業が完了する。 By the way, the outdoor unit O is shipped from the factory with the refrigerant enclosed in the refrigerant circuit and the operation valve 3 and the operation valve 11 closed, and the indoor unit I with the connection pipes 4 and 10 connected thereto. The After installing the outdoor unit O and the indoor unit I in a state shipped from the factory in a predetermined place, the connection pipes 4 and 10 are connected to the operation valve 3 and the operation valve 11 through the flare nut, Installation operation is completed by opening the operation valve 3 and the operation valve 11.

この据付作業が完了した空気調和機は、正常運転では、圧縮機１の運転周波数は次第に上昇し、室内熱交換器６の温度は暖房運転時に次第に上昇した後、若干下降して一定になり、冷房運転時に次第に下降した後、一定になるように変化する。ところが、工事ミスにより操作弁３および、または操作弁１１を閉じたままで空気調和機を運転すると、室内熱交換器６に冷媒が循環しないので、室内熱交換器６の温度はほとんど変化せず、かつ、圧縮機１の温度が異常に上昇し圧縮機１の損傷につながるおそれがある。 The air conditioner for which this installation work has been completed, in normal operation, the operating frequency of the compressor 1 gradually rises, and the temperature of the indoor heat exchanger 6 gradually rises during heating operation, and then drops and becomes constant, After gradually descending during cooling operation, it changes so as to be constant. However, when the air conditioner is operated with the operation valve 3 and / or the operation valve 11 closed due to a construction error, the refrigerant does not circulate in the indoor heat exchanger 6, so the temperature of the indoor heat exchanger 6 hardly changes. In addition, the temperature of the compressor 1 may rise abnormally and lead to damage to the compressor 1.

そこで、この空気調和機には、図４に示すように、試運転によって操作弁３および、または操作弁１１の開閉状態を判定し、工事ミスがないか否かを据付作業者に知らせるため、室内熱交換器６の温度を検出する熱交温度センサ１９が備えられるとともに、圧縮機１の運転周波数が基準値以上か否かを判断する周波数判断手段２１と、運転開始時、圧縮機１の運転周波数が基準値以上で熱交温度センサ１９の検出温度が冷房運転時所定値以下、暖房運転時所定値以上にならないとき、操作弁３、操作弁１１が閉じていると判定する判定手段２２と、操作弁３、操作弁１１が閉じていると判定されたとき、これを表示する異常表示手段２４とからなる保護装置２０を備えている（例えば、特許文献１参照）。 Therefore, in this air conditioner, as shown in FIG. 4, the open / close state of the operation valve 3 and / or the operation valve 11 is determined by trial operation, and the installation operator is informed whether there is any construction error. A heat exchanger temperature sensor 19 for detecting the temperature of the heat exchanger 6 is provided, frequency determining means 21 for determining whether or not the operating frequency of the compressor 1 is equal to or higher than a reference value, and operation of the compressor 1 at the start of operation. A determination means 22 for determining that the operation valve 3 and the operation valve 11 are closed when the frequency is equal to or higher than a reference value and the detected temperature of the heat exchanger temperature sensor 19 is not more than a predetermined value during cooling operation and not more than a predetermined value during heating operation; When it is determined that the operation valve 3 and the operation valve 11 are closed, a protection device 20 including an abnormality display means 24 for displaying the operation valve 3 is provided (see, for example, Patent Document 1).

しかしながら、特許文献１の技術では、室内ユニットＩ側に、操作弁３、操作弁１１の開閉状態を判定するための熱交温度センサ１９を設けているので、この熱交温度センサ１９の状態が故障などの不具合により正常に温度を検出しない場合、操作弁３、操作弁１１の開閉状態の判定を確実に行なうことができないという問題点があった。また、室外ユニットＯと熱交温度センサ１９とを接続する通信線が断線していたり、接続されていない場合、操作弁３、操作弁１１の開閉状態の判定を確実に行なうことができないという問題点があった。 However, in the technique of Patent Document 1, the heat exchange temperature sensor 19 for determining the open / close state of the operation valve 3 and the operation valve 11 is provided on the indoor unit I side. When the temperature is not normally detected due to a malfunction such as a failure, there is a problem that the open / close state of the operation valve 3 and the operation valve 11 cannot be reliably determined. In addition, when the communication line connecting the outdoor unit O and the heat exchanger temperature sensor 19 is disconnected or not connected, the open / close state of the operation valve 3 and the operation valve 11 cannot be reliably determined. There was a point.

特開平７−１７４３８６号公報（第２頁−第３頁、第１図）Japanese Patent Laid-Open No. 7-174386 (2nd page to 3rd page, FIG. 1)

本発明は上記問題点に鑑み、室内ユニット側の熱交温度センサの状態や室外ユニットと室内ユニットとの間の通信状態に係わらず、据付作業時の操作弁の開閉状態の判定を確実に行なうことができる空気調和機を提供することを目的とする。 In view of the above problems, the present invention reliably determines the open / closed state of the operation valve during installation work regardless of the state of the heat exchange temperature sensor on the indoor unit side or the communication state between the outdoor unit and the indoor unit. An object of the present invention is to provide an air conditioner that can be used.

本発明は上記課題を解決するため、請求項１記載の発明は、圧縮機、室外熱交換器および操作弁を備える室外ユニットと、室内熱交換器を備える室内ユニットとを接続配管を介して接続してなる空気調和機において、前記室外ユニットは、前記室内熱交換器と接続される液管の温度を検出する液管温度センサと、前記室内熱交換器と接続されるガス管の温度を検出するガス管温度センサと、前記圧縮機の運転周波数が基準値以上に達したか否かを判断する周波数判断部と、前記液管温度センサと前記ガス管温度センサの検出温度差を算出する温度差算出部と、前記周波数判断部の判断結果と、前記温度差算出部が算出した検出温度差に基づいて、前記操作弁の開閉状態を判定する判定部とを備え、前記判定部は、前記運転周波数が基準値以上に達し、前記検出温度差が基準値以下であるとき、前記操作弁が閉じた状態と判定することを特徴とする構成となっている。 In order to solve the above-mentioned problems, the invention according to claim 1 connects an outdoor unit including a compressor, an outdoor heat exchanger and an operation valve, and an indoor unit including an indoor heat exchanger via a connection pipe. In the air conditioner, the outdoor unit detects a temperature of a liquid pipe connected to the indoor heat exchanger and a temperature of a gas pipe connected to the indoor heat exchanger. A gas pipe temperature sensor, a frequency judgment unit for judging whether or not an operating frequency of the compressor has reached a reference value or more, and a temperature for calculating a detected temperature difference between the liquid pipe temperature sensor and the gas pipe temperature sensor A determination unit for determining an open / closed state of the operation valve based on a difference calculation unit, a determination result of the frequency determination unit, and a detected temperature difference calculated by the temperature difference calculation unit; Operating frequency is above the reference value Reached, when the detected temperature difference is equal to or less than the reference value, it has a configuration and judging a state of the operating valve is closed.

請求項２記載の発明は、圧縮機および室外熱交換器を備える室外ユニットと、冷媒分配器および複数の操作弁を備える分岐ユニットと、室内熱交換器を備える複数の室内ユニットとを接続配管を介して接続してなる空気調和機において、前記分岐ユニットは、前記複数の室内熱交換器と前記操作弁を介して接続されるそれぞれの液管の温度を検出する液管温度センサと、前記複数の室内熱交換器と前記操作弁を介して接続されるそれぞれのガス管の温度を検出するガス管温度センサと、前記圧縮機の運転周波数が基準値以上に達したか否かを判断する周波数判断部と、前記液管温度センサおよび前記ガス管温度センサにより、それぞれの前記室内熱交換器に接続された液管とガス管の検出温度差を算出する温度差算出部と、前記周波数判断部の判断結果と、前記温度差算出部が算出したそれぞれの検出温度差に基づいて、前記複数の操作弁の開閉状態を判定する判定部とを備え、前記判定部は、前記運転周波数が基準値以上に達し、前記検出温度差が基準値以下である液管とガス管に接続された前記操作弁が閉じた状態と判定することを特徴とする構成となっている。 According to a second aspect of the present invention, an outdoor unit including a compressor and an outdoor heat exchanger, a branch unit including a refrigerant distributor and a plurality of operation valves, and a plurality of indoor units including an indoor heat exchanger are connected to a piping. In the air conditioner connected through the plurality of indoor units, the branch unit includes a liquid tube temperature sensor that detects a temperature of each liquid tube connected to the plurality of indoor heat exchangers via the operation valve, and the plurality of the plurality of indoor heat exchangers. A gas pipe temperature sensor for detecting the temperature of each gas pipe connected to the indoor heat exchanger of the engine via the operation valve, and a frequency for judging whether the operating frequency of the compressor has reached a reference value or more A temperature difference calculating unit for calculating a detected temperature difference between the liquid pipe and the gas pipe connected to each of the indoor heat exchangers by the liquid pipe temperature sensor and the gas pipe temperature sensor; and the frequency determining part. A determination unit that determines the open / closed state of the plurality of operation valves based on the determination result and each detected temperature difference calculated by the temperature difference calculation unit, wherein the determination unit has the operation frequency equal to or higher than a reference value And the operation valve connected to the liquid pipe and the gas pipe whose detected temperature difference is equal to or less than a reference value is determined to be in a closed state.

本発明によれば、空気調和機の室内ユニット側の熱交温度センサの状態が故障などの不具合により正常に温度を検出しないときでも、据付作業時に、操作弁の開閉状態の判定を確実に行い、操作弁を閉じたまま運転したときの圧縮機の損傷を防止することができる。また、空気調和機の室外ユニットと室内ユニットとの間の通信線、または、分岐ユニットと室内ユニットとの間の通信線が断線していたり、接続されていなかったとしても、据付作業時に、操作弁の開閉状態の判定を確実に行い、操作弁を閉じたまま運転したときの圧縮機の損傷を防止することができる。 According to the present invention, even when the state of the heat exchange temperature sensor on the indoor unit side of the air conditioner does not detect the temperature normally due to a malfunction such as a failure, the open / close state of the operation valve is reliably determined during installation work. The compressor can be prevented from being damaged when operated with the operation valve closed. Even if the communication line between the outdoor unit and the indoor unit of the air conditioner or the communication line between the branch unit and the indoor unit is disconnected or not connected, it can be operated during installation work. It is possible to reliably determine the open / closed state of the valve, and to prevent damage to the compressor when operating with the operation valve closed.

本発明による空気調和機を示す冷媒回路図である。It is a refrigerant circuit diagram which shows the air conditioner by this invention. 本発明による空気調和機の試運転時の制御の一例を示すフローチャートである。It is a flowchart which shows an example of the control at the time of the test run of the air conditioner by this invention. 室外ユニットと室内ユニットとの間の工事ミスを示す模式図で、操作弁の開け忘れの一例を示す図である。It is a schematic diagram which shows the construction mistake between an outdoor unit and an indoor unit, and is a figure which shows an example of forgetting to open an operation valve. 従来の空気調和機を示す冷媒回路図である。It is a refrigerant circuit diagram which shows the conventional air conditioner.

以下、本発明の実施形態を添付図面に基づき詳細に説明する。本発明による空気調和機の実施例として、図１に示すように、１台の室外ユニットＸに３台の室内ユニットＡ〜Ｃが接続されたマルチ型空気調和機を例に説明する。なお、本実施形態では３台の室内ユニットが接続されたマルチ型空気調和機としたが、１台の室内ユニットが接続された分離型空気調和機でもよい。 Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an embodiment of an air conditioner according to the present invention, a multi-type air conditioner in which three indoor units A to C are connected to one outdoor unit X as shown in FIG. 1 will be described as an example. In the present embodiment, the multi-type air conditioner is connected to three indoor units, but may be a separated air conditioner to which one indoor unit is connected.

室外ユニットＸは、圧縮機１００が内装されており、この圧縮機１００の吐出配管１１０と吸込配管１２０とは四方弁１３０に接続され、吸込配管１２０の途中にはアキュムレータ１９０が配設されている。この四方弁１３０にはさらに、第１ガス管１４０と第２ガス管１５０とが接続されている。第１ガス管１４０には室外熱交換器１６０が接続されており、この室外熱交換器１６０に液管１７０と冷媒分配器１８０とが順次接続されている。この冷媒分配器１８０にはさらに、３本の分岐液管２００〜２２０が接続され、各分岐液管２００〜２２０にはそれぞれ膨張弁２３０〜２５０と液管側操作弁２６０〜２８０とが順次配設されている。また、第２ガス管１５０は３本の分岐ガス管２９０〜３１０に分岐され、各分岐ガス管２９０〜３１０にはそれぞれガス管側操作弁３２０〜３４０が配設されている。なお、液管側操作弁２６０〜２８０として２方弁を用い、ガス管側操作弁３２０〜３４０として真空ポンプ付３方弁を用いている。 The outdoor unit X includes a compressor 100, and a discharge pipe 110 and a suction pipe 120 of the compressor 100 are connected to a four-way valve 130, and an accumulator 190 is disposed in the middle of the suction pipe 120. . A first gas pipe 140 and a second gas pipe 150 are further connected to the four-way valve 130. An outdoor heat exchanger 160 is connected to the first gas pipe 140, and a liquid pipe 170 and a refrigerant distributor 180 are sequentially connected to the outdoor heat exchanger 160. Further, three branch liquid pipes 200 to 220 are connected to the refrigerant distributor 180, and expansion valves 230 to 250 and liquid pipe side operation valves 260 to 280 are sequentially arranged in the branch liquid pipes 200 to 220, respectively. It is installed. The second gas pipe 150 is branched into three branch gas pipes 290 to 310, and gas pipe side operation valves 320 to 340 are disposed in the branch gas pipes 290 to 310, respectively. A two-way valve is used as the liquid pipe side operation valves 260 to 280, and a three-way valve with a vacuum pump is used as the gas pipe side operation valves 320 to 340.

室内ユニットＡ〜Ｃには、それぞれ室内熱交換器３５０〜３７０が内装されており、室外ユニットＸの液管側操作弁２６０〜２８０とガス管側操作弁３２０〜３４０との間には、それぞれ液管側接続配管３８０〜４００およびガス管側接続配管４１０〜４３０によって、室内熱交換器３５０〜３７０が互いに並列に接続されている。 The indoor units A to C are respectively equipped with indoor heat exchangers 350 to 370, and between the liquid pipe side operation valves 260 to 280 and the gas pipe side operation valves 320 to 340 of the outdoor unit X, respectively. The indoor heat exchangers 350 to 370 are connected in parallel to each other by the liquid pipe side connection pipes 380 to 400 and the gas pipe side connection pipes 410 to 430.

本発明の空気調和機はこれらの構成によって室外ユニットＸと各室内ユニットＡ〜Ｃの間にそれぞれ冷媒回路が形成されている。室外ユニットＸ内の冷媒回路には、圧縮機１００の温度を検出する圧縮機温度センサＳｔ１が圧縮機１００に近接して配置され、圧縮機１００の吐出温度を検出する吐出温度センサＳｔ２と、圧縮機１００の吐出圧力を検出する吐出圧力センサＳｐとが吐出配管１１０に配置されている。また、室外温度を検出する室外温度センサＳｔ３が室外熱交換器１６０の付近に配置され、室外熱交換器１６０の冷房運転時における出口温度を検出する室外熱交換器温度センサＳｔ４が室外熱交換器１６０の出口付近の液管１７０に配置されている。更に、各分岐液管２００〜２２０の温度を検出する液管温度センサＳｔ５、Ｓｔ７、Ｓｔ９が各分岐液管２００〜２２０に配置され、各分岐ガス管２９０〜３１０の温度を検出するガス管温度センサＳｔ６、Ｓｔ８、Ｓｔ１０が各分岐ガス管２９０〜３１０に配置されている。 In the air conditioner of the present invention, a refrigerant circuit is formed between the outdoor unit X and each of the indoor units A to C by these configurations. In the refrigerant circuit in the outdoor unit X, a compressor temperature sensor St1 for detecting the temperature of the compressor 100 is disposed in the vicinity of the compressor 100, and a discharge temperature sensor St2 for detecting the discharge temperature of the compressor 100, and a compression A discharge pressure sensor Sp that detects the discharge pressure of the machine 100 is disposed in the discharge pipe 110. An outdoor temperature sensor St3 for detecting the outdoor temperature is disposed in the vicinity of the outdoor heat exchanger 160, and an outdoor heat exchanger temperature sensor St4 for detecting an outlet temperature during the cooling operation of the outdoor heat exchanger 160 is an outdoor heat exchanger. It is arranged in the liquid pipe 170 near the outlet of 160. Further, liquid pipe temperature sensors St5, St7, St9 for detecting the temperature of each branch liquid pipe 200-220 are arranged in each branch liquid pipe 200-220, and the gas pipe temperature for detecting the temperature of each branch gas pipe 290-310. Sensors St6, St8, and St10 are arranged in each branch gas pipe 290-310.

各室内ユニットＡ〜Ｃ内の冷媒回路には、各室内熱交換器３５０〜３７０の冷房運転時における入口温度を検出する室内熱交換器温度センサＳｔ１１、Ｓｔ１３、Ｓｔ１５が各室内熱交換器３５０〜３７０の入口付近の液管側接続配管３８０〜４００に配置され、各室内温度を検出する室内温度センサＳｔ１２、Ｓｔ１４、Ｓｔ１６が各室内熱交換器３５０〜３７０の付近に配置されている。 In the refrigerant circuits in the indoor units A to C, indoor heat exchanger temperature sensors St11, St13, and St15 that detect the inlet temperature during the cooling operation of the indoor heat exchangers 350 to 370 are included in the indoor heat exchangers 350 to 350, respectively. Indoor temperature sensors St12, St14, and St16 are arranged in the vicinity of the indoor heat exchangers 350 to 370, which are arranged in the liquid pipe side connection pipes 380 to 400 in the vicinity of the inlet 370 and detect the indoor temperatures.

更に、室外ユニットＸは、空気調和機の試運転時、操作弁の開閉状態を判定する操作弁開閉状態判定手段４４０を有しており、圧縮機１００の運転周波数の信号を入力し、運転開始から所定時間経過後、圧縮機１００の運転周波数が基準値以上に達したか否かを判断し、この判断結果を制御部５００に出力する周波数判断部４５０と、液管温度センサＳｔ５、Ｓｔ７、Ｓｔ９、ガス管温度センサＳｔ６、Ｓｔ８、Ｓｔ１０による検出信号を入力し、それぞれの室内熱交換器３５０〜３７０に接続された分岐液管２００〜２２０の温度と分岐ガス管２９０〜３１０の温度の検出温度差を算出し、これらの検出温度差を制御部５００に出力する温度差算出部４６０と、制御部５００に入力した圧縮機１００の運転周波数の判断結果と、それぞれの液管温度とガス管温度の検出温度差とに基づいて、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態を判定する判定部４７０と、判定部４７０による判定結果を表示する判定結果表示部４８０と、判定部４７０の判定条件となる運転周波数の基準値と検出温度差の基準値を設定し、制御部５００に出力する基準値設定部４９０と、周波数判断部４５０、温度差算出部４６０、判定部４７０および基準値設定部４９０をそれぞれ制御する制御部５００とを備えている。 Further, the outdoor unit X has an operation valve open / close state determination means 440 for determining the open / close state of the operation valve during the trial operation of the air conditioner, and inputs an operation frequency signal of the compressor 100 from the start of operation. After a predetermined time elapses, it is determined whether or not the operating frequency of the compressor 100 has reached a reference value or more, and a frequency determination unit 450 that outputs the determination result to the control unit 500, and liquid tube temperature sensors St5, St7, St9. The detection signals of the gas pipe temperature sensors St6, St8, St10 are input, and the temperature of the branch liquid pipes 200 to 220 and the temperature of the branch gas pipes 290 to 310 connected to the indoor heat exchangers 350 to 370 are detected. The temperature difference calculation unit 460 that calculates the difference and outputs the detected temperature difference to the control unit 500, the determination result of the operating frequency of the compressor 100 that is input to the control unit 500, Based on the detection temperature difference between the pipe temperature and the gas pipe temperature, the determination unit 470 that determines the open / closed state of the liquid pipe side operation valves 260 to 280 and the gas pipe side operation valves 320 to 340, and the determination result by the determination unit 470 The determination result display unit 480 to be displayed, the reference value of the operating frequency that is the determination condition of the determination unit 470 and the reference value of the detected temperature difference are set and output to the control unit 500, and the frequency determination unit 450 , A temperature difference calculation unit 460, a determination unit 470, and a control unit 500 for controlling the reference value setting unit 490, respectively.

次に、以上説明してきた空気調和機の動作を説明する。まず、図１を用いて冷房運転と暖房運転の基本動作を説明する。冷房運転時には、図示を省略したコントローラから四方弁１３０に制御信号を出力し、四方弁１３０を冷媒の流れ方向が実線矢印の方向になるように切換えて、室外熱交換器１６０を凝縮器、室内熱交換器３５０〜３７０を蒸発器として機能させる。冷房運転では、圧縮機１００から吐出された高温・高圧のガス冷媒は、実線矢印で示すように、四方弁１３０を経て室外熱交換器１６０に供給され、室外熱交換器１６０で外気に放熱することにより凝縮して高圧液冷媒となる。この高圧液冷媒はその後、冷媒分配器１８０を経て膨張弁２３０〜２５０に供給され、膨張弁２３０〜２５０で減圧されることにより低圧の液ガス二相冷媒となる。そして、この液ガス二相冷媒は液管側操作弁２６０〜２８０、液管側接続配管３８０〜４００を経て室内熱交換器３５０〜３７０に供給され、室内熱交換器３５０〜３７０で室内空気から吸熱することにより蒸発して低圧ガス冷媒となる。この低圧ガス冷媒はガス管側接続配管４１０〜４３０、ガス管側操作弁３２０〜３４０、四方弁１３０、アキュムレータ１９０を経て圧縮機１００に吸入される。 Next, the operation of the air conditioner described above will be described. First, basic operations of the cooling operation and the heating operation will be described with reference to FIG. During the cooling operation, a control signal is output from the controller (not shown) to the four-way valve 130, the four-way valve 130 is switched so that the flow direction of the refrigerant is in the direction of the solid arrow, and the outdoor heat exchanger 160 is The heat exchangers 350 to 370 function as an evaporator. In the cooling operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 100 is supplied to the outdoor heat exchanger 160 through the four-way valve 130 and is radiated to the outside air by the outdoor heat exchanger 160 as indicated by solid arrows. This condenses into a high-pressure liquid refrigerant. Thereafter, the high-pressure liquid refrigerant is supplied to the expansion valves 230 to 250 through the refrigerant distributor 180 and is decompressed by the expansion valves 230 to 250 to become a low-pressure liquid-gas two-phase refrigerant. Then, this liquid gas two-phase refrigerant is supplied to the indoor heat exchangers 350 to 370 through the liquid pipe side operation valves 260 to 280 and the liquid pipe side connection pipes 380 to 400, and from the indoor air in the indoor heat exchangers 350 to 370. By absorbing heat, it evaporates and becomes a low-pressure gas refrigerant. The low-pressure gas refrigerant is sucked into the compressor 100 through the gas pipe side connection pipes 410 to 430, the gas pipe side operation valves 320 to 340, the four-way valve 130, and the accumulator 190.

一方、暖房運転時には、図示を省略したコントローラから四方弁１３０に制御信号を出力し、四方弁１３０を冷媒の流れ方向が破線矢印の方向になるように切換えて、室内熱交換器３５０〜３７０を凝縮器、室外熱交換器１６０を蒸発器として機能させる。暖房運転では、圧縮機１００から吐出された高温・高圧のガス冷媒は、破線矢印で示すように、四方弁１３０、ガス管側操作弁３２０〜３４０、ガス管側接続配管４１０〜４３０を経て室内熱交換器３５０〜３７０に供給され、室内熱交換器３５０〜３７０で室内空気に放熱することにより凝縮して高圧液冷媒となる。この高圧液冷媒はその後、液管側接続配管３８０〜４００、液管側操作弁２６０〜２８０を経て膨張弁２３０〜２５０に供給され、膨張弁２３０〜２５０で減圧されることにより低圧の液ガス二相冷媒となる。そして、この液ガス二相冷媒は、冷媒分配器１８０、液管１７０を経て室外熱交換器１６０に供給され、室外熱交換器１６０で外気から吸熱することにより蒸発して低圧ガス冷媒となる。この低圧ガス冷媒は四方弁１３０、アキュムレータ１９０を経て圧縮機１００に吸入される。 On the other hand, during the heating operation, a control signal is output from the controller (not shown) to the four-way valve 130, the four-way valve 130 is switched so that the flow direction of the refrigerant is in the direction of the broken line arrow, and the indoor heat exchangers 350 to 370 are switched. The condenser and the outdoor heat exchanger 160 function as an evaporator. In the heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 100 passes through the four-way valve 130, the gas pipe side operation valves 320 to 340, and the gas pipe side connection pipes 410 to 430 as indicated by broken arrows. It is supplied to the heat exchangers 350 to 370 and is condensed by radiating heat to the indoor air in the indoor heat exchangers 350 to 370 to become a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is then supplied to the expansion valves 230 to 250 through the liquid pipe side connection pipes 380 to 400 and the liquid pipe side operation valves 260 to 280, and is decompressed by the expansion valves 230 to 250, whereby the low pressure liquid gas is supplied. It becomes a two-phase refrigerant. The liquid gas two-phase refrigerant is supplied to the outdoor heat exchanger 160 through the refrigerant distributor 180 and the liquid pipe 170, and is evaporated by absorbing heat from the outside air in the outdoor heat exchanger 160 to become a low-pressure gas refrigerant. This low-pressure gas refrigerant is sucked into the compressor 100 through the four-way valve 130 and the accumulator 190.

ところで、以上説明してきた空気調和機は、工場出荷時には、室外ユニットＸと室内ユニットＡ〜Ｃとは分離されており、室外ユニットＸは、冷媒回路内に冷媒を封入して液管側操作弁２６０〜２８０とガス管側操作弁３２０〜３４０とを閉じた状態に、室内ユニットＡ〜Ｃは、液管側接続配管３８０〜４００とガス管側接続配管４１０〜４３０とが接続された状態になっている。 By the way, in the air conditioner described above, the outdoor unit X and the indoor units A to C are separated from each other at the time of shipment from the factory. The outdoor unit X encloses a refrigerant in a refrigerant circuit and operates the liquid pipe side operation valve. The indoor units A to C are in a state where the liquid pipe side connection pipes 380 to 400 and the gas pipe side connection pipes 410 to 430 are connected in a state where the 260 to 280 and the gas pipe side operation valves 320 to 340 are closed. It has become.

このような工場出荷状態の空気調和機の据付作業は、室外ユニットＸと室内ユニットＡ〜Ｃとを所定の場所に据付けた後、室内ユニットＡに接続された液管側接続配管３８０とガス管側接続配管４１０とをフレアナットを介してそれぞれ液管側操作弁２６０とガス管側操作弁３２０に接続し、次いで、ガス管側操作弁３２０に接続した真空ポンプを作動させた後、液管側操作弁２６０を全開にする。すると、室外ユニットＸの冷媒回路内に封入されていた冷媒は、液管側操作弁２６０から液管側接続配管３８０を通って室内ユニットＡの冷媒回路内に流入し、これに伴って、液管側接続配管３８０と室内ユニットＡの冷媒回路内の空気が、ガス管側接続配管４１０を通ってガス管側操作弁３２０に接続されている真空ポンプに吸入される。次いで、真空ポンプによって冷媒回路内の空気が取り除かれた時点でガス管側操作弁３２０を全開にすることで室内ユニットＡについての作業が完了する。このように、室内ユニットＢと室内ユニットＣについても同様に作業することで空気調和機の据付作業が完了する。 The factory-installed air conditioner is installed by installing the outdoor unit X and the indoor units A to C at a predetermined location, and then connecting the liquid pipe side connection pipe 380 and the gas pipe connected to the indoor unit A. The side connection pipe 410 is connected to the liquid pipe side operation valve 260 and the gas pipe side operation valve 320 through a flare nut, respectively, and then the vacuum pump connected to the gas pipe side operation valve 320 is operated, and then the liquid pipe The side operation valve 260 is fully opened. Then, the refrigerant sealed in the refrigerant circuit of the outdoor unit X flows into the refrigerant circuit of the indoor unit A from the liquid pipe side operation valve 260 through the liquid pipe side connection pipe 380, and accordingly, the liquid Air in the refrigerant circuit of the pipe side connection pipe 380 and the indoor unit A is sucked into the vacuum pump connected to the gas pipe side operation valve 320 through the gas pipe side connection pipe 410. Next, when the air in the refrigerant circuit is removed by the vacuum pump, the operation for the indoor unit A is completed by fully opening the gas pipe side operation valve 320. In this way, the indoor unit B and the indoor unit C are similarly operated to complete the installation work of the air conditioner.

この据付作業が完了した空気調和機は、正常運転では、冷房運転時に室外熱交換器温度が液管温度よりも高く、液管温度がガス管温度よりも高くなるように変化し、暖房運転時にガス管温度が液管温度よりも高く、液管温度が室外熱交換器温度よりも高くなるように変化する。ところが、据付工事ミスにより液管側操作弁２６０〜２８０、ガス管側操作弁３２０〜３４０のいずれかの操作弁を閉じたままで空気調和機を運転すると、閉じた操作弁に対応する室内熱交換器に冷媒が循環しないので、上述の正常運転のような室外熱交換器温度、液管温度、ガス管温度の大小関係にならず、圧縮機１００が過負荷となって、その温度が異常に上昇し、圧縮機１００の損傷につながるおそれがある。そこで、空気調和機の試運転時、操作弁開閉状態判定手段４４０により、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態を判定して、据付作業者に判定結果を知らせるようにしている。 When the air conditioner has been installed, the outdoor heat exchanger temperature changes during normal operation so that the outdoor heat exchanger temperature is higher than the liquid pipe temperature and the liquid pipe temperature is higher than the gas pipe temperature. The gas pipe temperature changes so as to be higher than the liquid pipe temperature, and the liquid pipe temperature becomes higher than the outdoor heat exchanger temperature. However, if the air conditioner is operated while any one of the liquid pipe side operation valves 260 to 280 and the gas pipe side operation valves 320 to 340 is closed due to an installation work error, indoor heat exchange corresponding to the closed operation valve is performed. Since the refrigerant does not circulate in the compressor, the magnitude of the outdoor heat exchanger temperature, liquid pipe temperature, and gas pipe temperature as in the normal operation described above does not occur, and the compressor 100 is overloaded and the temperature becomes abnormal. There is a risk that the compressor 100 may rise and lead to damage to the compressor 100. Therefore, during the trial operation of the air conditioner, the open / close state of the liquid pipe side operation valves 260 to 280 and the gas pipe side operation valves 320 to 340 is determined by the operation valve open / close state determination means 440 and the determination result is sent to the installation operator. I will let you know.

次に、図２を用いて本発明の特徴となる空気調和機の試運転の動作を説明する。図２において、Ｓはステップを、数字はステップ番号をそれぞれ表す。なお、本発明の実施例として、冷房運転によって室内ユニットＡ〜Ｃを１台ずつ試運転する例について説明する。図２に示すように、冷房運転の開始信号を受けた図示を省略したコントローラは、冷媒の方向が図１に示す実線矢印の方向になるように四方弁１３０を切換える（Ｓ１）。次いで、コントローラは、初めにカウンタ値ｎを１に設定し（Ｓ２）、カウンタ値ｎが３を超えたか否かを判断する（Ｓ３）。カウンタ値ｎが３以下であれば（Ｓ３−ＹＥＳ）、Ｓ４のステップに移行し、カウンタ値ｎが３を超えていれば（Ｓ３−ＮＯ）、空気調和機の試運転を終了する。コントローラは、Ｓ２のステップにより、カウンタ値ｎは１になっているため、カウンタ値ｎが３以下であると判断し（Ｓ３−ＹＥＳ）、カウンタ値１に対応する室内ユニットＡに関係する膨張弁２３０を所定の開度となるように開き（Ｓ４）、圧縮機１００の運転を開始する（Ｓ５）。 Next, the operation of the trial operation of the air conditioner, which is a feature of the present invention, will be described with reference to FIG. In FIG. 2, S represents a step, and a number represents a step number. As an embodiment of the present invention, an example in which the indoor units A to C are tested one by one by cooling operation will be described. As shown in FIG. 2, the controller (not shown) that receives the cooling operation start signal switches the four-way valve 130 so that the direction of the refrigerant is the direction of the solid line arrow shown in FIG. 1 (S1). Next, the controller first sets the counter value n to 1 (S2), and determines whether or not the counter value n exceeds 3 (S3). If the counter value n is 3 or less (S3-YES), the process proceeds to step S4. If the counter value n exceeds 3 (S3-NO), the trial operation of the air conditioner is terminated. The controller determines that the counter value n is 3 or less because the counter value n is 1 in step S2 (S3-YES), and the expansion valve related to the indoor unit A corresponding to the counter value 1 is determined. 230 is opened to a predetermined opening degree (S4), and the operation of the compressor 100 is started (S5).

周波数判断部４５０は、コントローラからの圧縮機１００の運転開始信号を受信すると、圧縮機１００を監視し、運転開始から所定時間経過後、圧縮機１００の運転周波数が基準値以上に達したか否かを判断する（Ｓ６）。運転周波数が基準値以上に達していれば（Ｓ６−ＹＥＳ）、Ｓ７に移行し、基準値に満たなければ（Ｓ６−ＮＯ）、Ｓ６のステップを繰返し実行する。なお、基準値には、基準値設定部４９０で設定された運転周波数の基準値を、制御部５００を介して周波数判断部４５０に入力する。また、周波数判断部４５０による圧縮機１００の運転周波数が基準値以上に達したか否かの判断結果は、制御部５００に出力される。 When the frequency determination unit 450 receives the operation start signal of the compressor 100 from the controller, the frequency determination unit 450 monitors the compressor 100, and whether or not the operation frequency of the compressor 100 has reached a reference value or more after a predetermined time has elapsed from the start of operation. (S6). If the operating frequency has reached or exceeded the reference value (S6-YES), the process proceeds to S7, and if it does not satisfy the reference value (S6-NO), step S6 is repeatedly executed. Note that the reference value of the operating frequency set by the reference value setting unit 490 is input to the frequency determination unit 450 via the control unit 500 as the reference value. Further, the determination result of whether or not the operating frequency of the compressor 100 by the frequency determination unit 450 has reached or exceeded the reference value is output to the control unit 500.

Ｓ７のステップでは、分岐液管２００の温度が液管温度センサＳｔ５により検出され、分岐ガス管２９０の温度がガス管温度センサＳｔ６により検出される。運転周波数が基準値以上に達しているとの判断信号が制御部５００に入力された場合、制御部５００は、温度差算出部４６０に分岐液管２００の温度と分岐ガス管２９０の温度のそれぞれの検出信号の入力を指令する。温度差算出部４６０は、入力された分岐液管２００の温度と分岐ガス管２９０の温度のそれぞれの検出信号により、分岐液管２００の温度と分岐ガス管２９０の温度の検出温度差を算出し、制御部５００に出力する（Ｓ８）。検出温度差の算出信号が制御部５００に入力された場合、制御部５００は、判定部４７０に検出温度差の算出信号を出力するとともに、基準値設定部４９０で設定された検出温度差の基準値を、判定部４７０に入力する。 In step S7, the temperature of the branch liquid pipe 200 is detected by the liquid pipe temperature sensor St5, and the temperature of the branch gas pipe 290 is detected by the gas pipe temperature sensor St6. When a determination signal indicating that the operating frequency has reached or exceeded the reference value is input to the control unit 500, the control unit 500 sends the temperature difference calculation unit 460 to each of the temperature of the branch liquid pipe 200 and the temperature of the branch gas pipe 290. Command input of detection signal. The temperature difference calculation unit 460 calculates a detected temperature difference between the temperature of the branch liquid pipe 200 and the temperature of the branch gas pipe 290 based on the input detection signals of the temperature of the branch liquid pipe 200 and the temperature of the branch gas pipe 290. And output to the controller 500 (S8). When the detection temperature difference calculation signal is input to the control unit 500, the control unit 500 outputs the detection temperature difference calculation signal to the determination unit 470, and the reference of the detection temperature difference set by the reference value setting unit 490. The value is input to the determination unit 470.

判定部４７０は、制御部５００からの検出温度差の算出信号と基準値とを比較し、検出温度差が基準値以下であるか否かを判定する（Ｓ９）。そして、判定部４７０は、分岐液管２００の温度と分岐ガス管２９０の温度の検出温度差が基準値以下の場合（Ｓ９−ＹＥＳ）、液管側操作弁２６０やガス管側操作弁３２０が閉じた状態と判定し、その判定結果信号を制御部５００に出力する。一方、判定部４７０は、分岐液管２００の温度と分岐ガス管２９０の温度の検出温度差が基準値よりも大きい場合（Ｓ９−ＮＯ）、液管側操作弁２６０やガス管側操作弁３２０が開いた状態と判定し、その判定結果信号を制御部５００に出力する。制御部５００は、判定部４７０からの判定結果信号が入力された場合、判定結果信号に応じた表示データを作成し、この表示データを判定結果表示部４８０に表示させる。 The determination unit 470 compares the detected temperature difference calculation signal from the control unit 500 with a reference value, and determines whether or not the detected temperature difference is equal to or less than the reference value (S9). Then, when the detected temperature difference between the temperature of the branch liquid pipe 200 and the temperature of the branch gas pipe 290 is equal to or less than the reference value (S9-YES), the determination unit 470 determines whether the liquid pipe side operation valve 260 or the gas pipe side operation valve 320 is The closed state is determined, and the determination result signal is output to the control unit 500. On the other hand, when the detected temperature difference between the temperature of the branch liquid pipe 200 and the temperature of the branch gas pipe 290 is larger than the reference value (S9-NO), the determination unit 470 determines the liquid pipe side operation valve 260 and the gas pipe side operation valve 320. Is determined to be open, and a determination result signal is output to the control unit 500. When the determination result signal from the determination unit 470 is input, the control unit 500 creates display data corresponding to the determination result signal and causes the determination result display unit 480 to display the display data.

判定結果表示部４８０は、液管側操作弁２６０、ガス管側操作弁３２０の異常を知らせる表示データ、例えば、「液管側操作弁２６０、ガス管側操作弁３２０の一方または両方が閉じた状態です。液管側操作弁２６０とガス管側操作弁３２０を確認して下さい。」といった表示データを表示し（Ｓ１０）、または、液管側操作弁２６０、ガス管側操作弁３２０の正常を知らせる表示データ、例えば、「液管側操作弁２６０とガス管側操作弁３２０が開いた状態です。液管側操作弁２６０とガス管側操作弁３２０の設置状態はＯＫです。」といった表示データを表示する（Ｓ１１）。 The determination result display unit 480 displays display data for notifying the abnormality of the liquid pipe side operation valve 260 and the gas pipe side operation valve 320, for example, “one or both of the liquid pipe side operation valve 260 and the gas pipe side operation valve 320 are closed. "Check the liquid pipe side operation valve 260 and the gas pipe side operation valve 320" (S10), or the liquid pipe side operation valve 260 and the gas pipe side operation valve 320 are normal. For example, “The liquid pipe side operation valve 260 and the gas pipe side operation valve 320 are open. The installation state of the liquid pipe side operation valve 260 and the gas pipe side operation valve 320 is OK”. Data is displayed (S11).

Ｓ１〜Ｓ１１のステップを実行することにより、室内ユニットＡの試運転が完了するので、コントローラは、カウンタ値ｎに１を加算し（Ｓ１２）、Ｓ３のステップに戻る。Ｓ３のステップでは、コントローラは、Ｓ１２のステップにより、カウンタ値ｎは２になっているため、カウンタ値ｎが３以下であると判断し（Ｓ３−ＹＥＳ）、カウンタ値２に対応する室内ユニットＢに関係する膨張弁２４０を所定の開度となるように開く（Ｓ４）。以降のＳ５〜Ｓ１１のステップは室内ユニットＡと同様に実行される。ただし、異なる部分は、室内ユニットＢに対応する分岐液管２１０の温度が液管温度センサＳｔ７により検出され、分岐ガス管３００の温度がガス管温度センサＳｔ８により検出され、それぞれの検出信号に基づいて、分岐液管２１０の温度と分岐ガス管３００の温度の検出温度差を算出し、この検出温度差が基準値と比較され、液管側操作弁２７０、ガス管側操作弁３３０の異常または正常であると判定する。 Since the trial operation of the indoor unit A is completed by executing the steps S1 to S11, the controller adds 1 to the counter value n (S12), and returns to the step S3. In step S3, the controller determines that the counter value n is 3 or less because the counter value n is 2 in step S12 (S3-YES), and the indoor unit B corresponding to the counter value 2 is determined. The expansion valve 240 related to is opened to a predetermined opening degree (S4). The subsequent steps S5 to S11 are executed in the same manner as the indoor unit A. However, in the different parts, the temperature of the branch liquid pipe 210 corresponding to the indoor unit B is detected by the liquid pipe temperature sensor St7, the temperature of the branch gas pipe 300 is detected by the gas pipe temperature sensor St8, and based on the respective detection signals. Then, a detected temperature difference between the temperature of the branch liquid pipe 210 and the temperature of the branch gas pipe 300 is calculated, and this detected temperature difference is compared with a reference value, and the liquid pipe side operation valve 270 and the gas pipe side operation valve 330 are abnormal or Determined to be normal.

これで、室内ユニットＢの試運転が完了するので、コントローラは、カウンタ値ｎに１を加算し（Ｓ１２）、Ｓ３のステップに戻る。Ｓ３のステップでは、コントローラは、Ｓ１２のステップにより、カウンタ値ｎは３になっているため、カウンタ値ｎが３以下であると判断し（Ｓ３−ＹＥＳ）、カウンタ値３に対応する室内ユニットＣに関係する膨張弁２５０を所定の開度となるように開く（Ｓ４）。以降のＳ５〜Ｓ１１のステップは室内ユニットＡと同様に実行される。ただし、異なる部分は、室内ユニットＣに対応する分岐液管２２０の温度が液管温度センサＳｔ９により検出され、分岐ガス管３１０の温度がガス管温度センサＳｔ１０により検出され、それぞれの検出信号に基づいて、分岐液管２２０の温度と分岐ガス管３１０の温度の検出温度差を算出し、この検出温度差が基準値と比較され、液管側操作弁２８０、ガス管側操作弁３４０の異常または正常であると判定する。これにより、室内ユニットＣの試運転が完了するので、コントローラは、カウンタ値ｎに１を加算し（Ｓ１２）、Ｓ３のステップに戻る。Ｓ３のステップでは、コントローラは、Ｓ１２のステップにより、カウンタ値ｎは４になっているため、カウンタ値ｎが３を超えていると判断し（Ｓ３−ＮＯ）、本実施例の空気調和機の試運転の制御を終了する。 Thus, since the trial operation of the indoor unit B is completed, the controller adds 1 to the counter value n (S12), and returns to the step of S3. In step S3, the controller determines that the counter value n is 3 or less because the counter value n is 3 in step S12 (S3-YES), and the indoor unit C corresponding to the counter value 3 is determined. The expansion valve 250 related to is opened to a predetermined opening degree (S4). The subsequent steps S5 to S11 are executed in the same manner as the indoor unit A. However, in the different parts, the temperature of the branch liquid pipe 220 corresponding to the indoor unit C is detected by the liquid pipe temperature sensor St9, the temperature of the branch gas pipe 310 is detected by the gas pipe temperature sensor St10, and based on the respective detection signals. Thus, a detected temperature difference between the temperature of the branch liquid pipe 220 and the temperature of the branch gas pipe 310 is calculated, and this detected temperature difference is compared with a reference value, and the liquid pipe side operation valve 280 and the gas pipe side operation valve 340 are abnormal or Determined to be normal. Thereby, since the trial operation of the indoor unit C is completed, the controller adds 1 to the counter value n (S12), and returns to the step of S3. In step S3, since the counter value n is 4 in step S12, the controller determines that the counter value n exceeds 3 (S3-NO), and the controller of the air conditioner of the present embodiment. End trial run control.

次に、図２のフローチャートの試運転の制御を実行した結果、室外ユニットと室内ユニットの間に据付工事ミスがあった例について図３を用いて説明する。これは操作弁の開け忘れがあった例であり、室外ユニットＸと室内ユニットＡとを接続する図中網かけされた液管側操作弁２６０とガス管側操作弁３２０の両方に開け忘れがあったため、液管側接続配管３８０から室内熱交換器３５０を介してガス管側接続配管４１０に冷媒が流れない状態を示している。この場合、判定部４７０では、分岐液管２００の温度（液管温度センサＳｔ５の検出信号）と分岐ガス管２９０の温度（ガス管温度センサＳｔ６の検出信号）の検出温度差が基準値以下となり、液管側操作弁２６０やガス管側操作弁３２０が閉じた状態と判定される。 Next, an example in which there is an installation error between the outdoor unit and the indoor unit as a result of executing the trial run control of the flowchart of FIG. 2 will be described with reference to FIG. This is an example of forgetting to open the operation valve. Forgetting to open both the liquid pipe side operation valve 260 and the gas pipe side operation valve 320 which are shaded in the drawing connecting the outdoor unit X and the indoor unit A. Therefore, the refrigerant does not flow from the liquid pipe side connection pipe 380 to the gas pipe side connection pipe 410 via the indoor heat exchanger 350. In this case, in the determination unit 470, the detected temperature difference between the temperature of the branch liquid pipe 200 (the detection signal of the liquid pipe temperature sensor St5) and the temperature of the branch gas pipe 290 (the detection signal of the gas pipe temperature sensor St6) is less than the reference value. Then, it is determined that the liquid pipe side operation valve 260 and the gas pipe side operation valve 320 are closed.

以上説明してきた本発明による空気調和機によれば、室外ユニットＸ内に配置された液管温度センサＳｔ５、Ｓｔ７、Ｓｔ９、ガス管温度センサＳｔ６、Ｓｔ８、Ｓｔ１０によって、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態の判定に必要な温度を検出するようになっている。したがって、室内ユニットＡ〜Ｃの室内熱交換器温度センサＳｔ１１、Ｓｔ１３、Ｓｔ１５の状態が故障などの不具合により正常に温度を検出しないときでも、据付作業時に、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態の判定を確実に行うことができ、操作弁を閉じたまま運転したときの圧縮機１００の損傷を防止することができる。また、室外ユニットＸと室内ユニットＡ〜Ｃの室内熱交換器温度センサＳｔ１１、Ｓｔ１３、Ｓｔ１５とを接続する通信線が断線していたり、接続されていなかったとしても、据付作業時に、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態の判定を確実に行うことができ、操作弁を閉じたまま運転したときの圧縮機１００の損傷を防止することができる。 According to the air conditioner according to the present invention described above, the liquid pipe side operation valves 260 to 160 are provided by the liquid pipe temperature sensors St5, St7, St9 and the gas pipe temperature sensors St6, St8, St10 arranged in the outdoor unit X. The temperature required to determine the open / closed state of the H.280 and gas pipe side operation valves 320 to 340 is detected. Therefore, even when the temperature of the indoor heat exchanger temperature sensors St11, St13, St15 of the indoor units A to C does not detect the temperature normally due to a malfunction such as a failure, the liquid pipe side operation valves 260 to 280 and the gas can be used during the installation work. The open / close state of the pipe side operation valves 320 to 340 can be reliably determined, and the compressor 100 can be prevented from being damaged when the operation is performed with the operation valves closed. Further, even if the communication line connecting the outdoor unit X and the indoor heat exchanger temperature sensors St11, St13, St15 of the indoor units A to C is disconnected or not connected, the liquid pipe side The open / close state of the operation valves 260 to 280 and the gas pipe side operation valves 320 to 340 can be reliably determined, and the compressor 100 can be prevented from being damaged when operated with the operation valves closed.

なお、以上説明してきた本実施形態に限定されず、図１に示す室外ユニットＸの破線ブロックを分離した分岐ユニットＹとして構成し、室外ユニットＸと室内ユニットＡ〜Ｃとの間に分岐ユニットＹを配置するようにしてもよい。この場合も、室内ユニットＡ〜Ｃの室内熱交換器温度センサＳｔ１１、Ｓｔ１３、Ｓｔ１５の状態が故障などの不具合により正常に温度を検出しないときでも、据付作業時に、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態の判定を確実に行うことができる。また、分岐ユニットＹと室内ユニットＡ〜Ｃの室内熱交換器温度センサＳｔ１１、Ｓｔ１３、Ｓｔ１５とを接続する通信線が断線していたり、接続されていなかったとしても、据付作業時に、上述と同様に、操作弁の開閉状態の判定を確実に行うことができ、操作弁を閉じたまま運転したときの圧縮機１００の損傷を防止することができる。 In addition, it is not limited to this embodiment demonstrated above, It comprises as the branch unit Y which isolate | separated the broken-line block of the outdoor unit X shown in FIG. 1, and branch unit Y is between the outdoor unit X and indoor unit AC. May be arranged. Also in this case, even when the temperature of the indoor heat exchanger temperature sensors St11, St13, St15 of the indoor units A to C does not detect the temperature normally due to a malfunction such as a failure, the liquid pipe side operation valves 260 to 280 are installed during the installation work. In addition, the open / close state of the gas pipe side operation valves 320 to 340 can be reliably determined. Further, even if the communication line connecting the branch unit Y and the indoor heat exchanger temperature sensors St11, St13, St15 of the indoor units A to C is disconnected or not connected, the same as described above during the installation work In addition, the open / closed state of the operation valve can be reliably determined, and the compressor 100 can be prevented from being damaged when the operation valve is operated with the operation valve closed.

また、以上説明してきた本実施形態では、冷房運転によって室内ユニットＡ〜Ｃを１台ずつ試運転するようにしたが、本発明はこれに限らず、冷房運転によって室内ユニットＡ〜Ｃを同時に試運転するようにしてもよく、冷房運転に替えて暖房運転によって室内ユニットＡ〜Ｃを試運転するようにしてもよい。暖房運転の場合、上述したように、ガス管温度が液管温度よりも高くなる大小関係があり、この大小関係を考慮して、基準値設定部４９０では、分岐ガス管の温度と分岐液管の温度の検出温度差の基準値を予め設定しておき、判定部４７０では、分岐ガス管の温度と分岐液管の温度との検出温度差が基準値以下の場合、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０が閉じた状態と判定することができる。 In the present embodiment described above, the indoor units A to C are tested one by one by the cooling operation. However, the present invention is not limited to this, and the indoor units A to C are simultaneously tested by the cooling operation. Alternatively, the indoor units A to C may be trial-run by heating operation instead of the cooling operation. In the case of heating operation, as described above, there is a magnitude relationship in which the gas pipe temperature becomes higher than the liquid pipe temperature. In consideration of this magnitude relation, the reference value setting unit 490 determines the temperature of the branch gas pipe and the branch liquid pipe. The reference value of the detected temperature difference between the two temperatures is set in advance. In the determination unit 470, when the detected temperature difference between the temperature of the branch gas pipe and the temperature of the branch liquid pipe is equal to or less than the reference value, the liquid pipe side operation valve 260 is set. ˜280 and the gas pipe side operation valves 320 to 340 can be determined to be closed.

また、以上説明してきた本実施形態では、周波数判断部４５０は、圧縮機１００の運転開始から所定時間経過後、圧縮機１００の運転周波数が基準値以上に達したと判断した場合、制御部５００を介して判定部４７０に、この判断信号を出力し、判定部４７０は、判断信号の入力により判定動作を開始するようにしたが、本発明はこれに限らない。圧縮機１００の運転開始から所定時間経過した場合、判定部４７０の判定動作を開始するようにしたり、圧縮機１００の運転開始後、圧縮機１００の運転周波数が基準値以上に達したと判断した場合、判定部４７０の判定動作を開始するようにしてもよい。 In the present embodiment described above, when the frequency determination unit 450 determines that the operation frequency of the compressor 100 has reached the reference value or more after a predetermined time has elapsed since the start of operation of the compressor 100, the control unit 500 The determination signal is output to the determination unit 470 via the control unit, and the determination unit 470 starts the determination operation by inputting the determination signal. However, the present invention is not limited to this. When a predetermined time has elapsed from the start of operation of the compressor 100, the determination unit 470 starts the determination operation, or after the operation of the compressor 100 is started, it is determined that the operation frequency of the compressor 100 has reached a reference value or more. In this case, the determination operation of the determination unit 470 may be started.

更に、以上説明してきた本実施形態では、判定部４７０では、分岐液管２００〜２２０の温度（液管温度センサＳｔ５、Ｓｔ７、Ｓｔ９の検出信号）と分岐ガス管２９０〜３１０の温度（ガス管温度センサＳｔ６、Ｓｔ８、Ｓｔ１０の検出信号）のそれぞれの検出温度差を基準値と比較することで、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態を判定するようにしたが、本発明はこれに限らない。例えば、冷房運転によって室内ユニットＡ〜Ｃを試運転することにより、室外熱交換器温度センサＳｔ４を用いて、室外熱交換器１６０の出口温度を検出し、温度差算出部４６０が、室外熱交換器１６０の出口温度と分岐液管２００〜２２０の温度のそれぞれの検出温度差、室外熱交換器１６０の出口温度と分岐ガス管２９０〜３１０の温度のそれぞれの検出温度差も算出する。 Further, in the present embodiment described above, the determination unit 470 determines the temperature of the branch liquid pipes 200 to 220 (detection signals of the liquid pipe temperature sensors St5, St7, St9) and the temperature of the branch gas pipes 290 to 310 (gas pipe). The detection temperature difference of each of the temperature sensors St6, St8, and St10) is compared with a reference value to determine the open / closed state of the liquid pipe side operation valves 260 to 280 and the gas pipe side operation valves 320 to 340. However, the present invention is not limited to this. For example, by performing a trial operation of the indoor units A to C by the cooling operation, the outlet temperature of the outdoor heat exchanger 160 is detected using the outdoor heat exchanger temperature sensor St4, and the temperature difference calculation unit 460 is used as the outdoor heat exchanger. A detected temperature difference between the outlet temperature of 160 and the temperatures of the branch liquid pipes 200 to 220 and a detected temperature difference between the outlet temperature of the outdoor heat exchanger 160 and the temperatures of the branch gas pipes 290 to 310 are also calculated.

そして、判定部４７０が、室外熱交換器１６０の出口温度と分岐液管２００〜２２０の温度のそれぞれの検出温度差を、上述の大小関係を考慮して設定した別の基準値と比較するとともに、室外熱交換器１６０の出口温度と分岐ガス管２９０〜３１０の温度のそれぞれの検出温度差を、上述の大小関係を考慮して設定した別の基準値と比較し、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態を判定するようにしてもよい。このように、３つの検出温度差を用いて操作弁の開閉状態を判定するようにした場合、液管温度センサＳｔ５、Ｓｔ７、Ｓｔ９、または、ガス管温度センサＳｔ６、Ｓｔ８、Ｓｔ１０の状態が故障などの不具合により正常に温度を検出しないときでも、他の検出温度差と基準値との比較結果により、液管側操作弁２６０〜２８０やガス管側操作弁３２０〜３４０の開閉状態の判定を確実に行うことができる。 The determination unit 470 compares the detected temperature difference between the outlet temperature of the outdoor heat exchanger 160 and the temperature of the branch liquid pipes 200 to 220 with another reference value set in consideration of the above-described magnitude relationship. The detected temperature difference between the outlet temperature of the outdoor heat exchanger 160 and the temperature of the branch gas pipes 290 to 310 is compared with another reference value set in consideration of the above-described magnitude relationship, and the liquid pipe side operation valve 260 is compared. ˜280 and the open / close state of the gas pipe side operation valves 320 to 340 may be determined. As described above, when the open / close state of the operation valve is determined using the three detected temperature differences, the liquid tube temperature sensors St5, St7, St9, or the gas tube temperature sensors St6, St8, St10 are in failure. Even when the temperature is not normally detected due to a malfunction such as the above, the open / close state of the liquid pipe side operation valves 260 to 280 and the gas pipe side operation valves 320 to 340 is determined based on the comparison result between the other detected temperature difference and the reference value. It can be done reliably.

１００圧縮機
１１０吐出配管
１２０吸込配管
１３０四方弁
１４０第１ガス管
１５０第２ガス管
１６０室外熱交換器
１７０液管
１８０冷媒分配器
１９０アキュムレータ
２００〜２２０分岐液管
２３０〜２５０膨張弁
２６０〜２８０液管側操作弁
２９０〜３１０分岐ガス管
３２０〜３４０ガス管側操作弁
３５０〜３７０室内熱交換器
３８０〜４００液管側接続配管
４１０〜４３０ガス管側接続配管
４４０操作弁開閉状態判定手段
４５０周波数判断部
４６０温度差算出部
４７０判定部
４８０判定結果表示部
４９０基準値設定部
５００制御部
Ｘ室外ユニット
Ｙ分岐ユニット
Ａ〜Ｃ室内ユニット
Ｓｔ１圧縮機温度センサ
Ｓｔ２吐出温度センサ
Ｓｐ吐出圧力センサ
Ｓｔ３室外温度センサ
Ｓｔ４室外熱交換器温度センサ
Ｓｔ５、Ｓｔ７、Ｓｔ９液管温度センサ
Ｓｔ６、Ｓｔ８、Ｓｔ１０ガス管温度センサ
Ｓｔ１１、Ｓｔ１３、Ｓｔ１５室内熱交換器温度センサ
Ｓｔ１２、Ｓｔ１４、Ｓｔ１６室内温度センサ DESCRIPTION OF SYMBOLS 100 Compressor 110 Discharge piping 120 Suction piping 130 Four-way valve 140 1st gas pipe 150 2nd gas pipe 160 Outdoor heat exchanger 170 Liquid pipe 180 Refrigerant distributor 190 Accumulator 200-220 Branch liquid pipe 230-250 Expansion valve 260-280 Liquid pipe side operation valve 290 to 310 Branch gas pipe 320 to 340 Gas pipe side operation valve 350 to 370 Indoor heat exchanger 380 to 400 Liquid pipe side connection pipe 410 to 430 Gas pipe side connection pipe 440 Operation valve open / close state determination means 450 Frequency determination unit 460 Temperature difference calculation unit 470 Determination unit 480 Determination result display unit 490 Reference value setting unit 500 Control unit X Outdoor unit Y Branch unit A to C Indoor unit St1 Compressor temperature sensor St2 Discharge temperature sensor Sp Discharge pressure sensor St3 Outdoor Temperature sensor St4 outdoor heat exchanger Degree sensor St5, St 7, St9 liquid pipe temperature sensor St6, St8, St10 gas pipe temperature sensor St11, St13, St15 indoor heat exchanger temperature sensor St12, St14, St16 room temperature sensor

Claims

In an air conditioner formed by connecting an outdoor unit including a compressor, an outdoor heat exchanger and an operation valve, and an indoor unit including an indoor heat exchanger via a connection pipe, the outdoor unit includes the indoor heat exchanger. A liquid pipe temperature sensor for detecting a temperature of a liquid pipe connected to the gas pipe, a gas pipe temperature sensor for detecting a temperature of a gas pipe connected to the indoor heat exchanger, and an operating frequency of the compressor exceeding a reference value A frequency determination unit that determines whether or not the temperature has been reached, a temperature difference calculation unit that calculates a detected temperature difference between the liquid pipe temperature sensor and the gas pipe temperature sensor, a determination result of the frequency determination unit, and the temperature difference calculation A determination unit that determines an open / close state of the operation valve based on the detected temperature difference calculated by the unit, wherein the determination unit reaches the operating frequency equal to or higher than a reference value, and the detected temperature difference is equal to or lower than the reference value. When there is said operation Air conditioner and judging the state is closed.

An air conditioner in which an outdoor unit including a compressor and an outdoor heat exchanger, a branching unit including a refrigerant distributor and a plurality of operation valves, and a plurality of indoor units including an indoor heat exchanger are connected via a connection pipe. In the machine, the branch unit includes a liquid pipe temperature sensor that detects a temperature of each liquid pipe connected to the plurality of indoor heat exchangers via the operation valve, the plurality of indoor heat exchangers, and the operation. A gas pipe temperature sensor for detecting the temperature of each gas pipe connected via a valve, a frequency determining unit for judging whether or not the operating frequency of the compressor has reached a reference value or more, and the liquid pipe temperature A temperature difference calculating unit that calculates a detected temperature difference between the liquid pipe and the gas pipe connected to each indoor heat exchanger by the sensor and the gas pipe temperature sensor, a determination result of the frequency determining unit, and the temperature A determination unit that determines open / closed states of the plurality of operation valves based on the respective detected temperature differences calculated by the calculation unit, wherein the determination unit reaches the operating frequency equal to or higher than a reference value, and the detected temperature difference It is determined that the operation valve connected to the liquid pipe and the gas pipe having a value equal to or less than a reference value is closed.