JPH02195165A - Freezing and air conditioning state monitor - Google Patents
Freezing and air conditioning state monitorInfo
- Publication number
- JPH02195165A JPH02195165A JP1295889A JP1295889A JPH02195165A JP H02195165 A JPH02195165 A JP H02195165A JP 1295889 A JP1295889 A JP 1295889A JP 1295889 A JP1295889 A JP 1295889A JP H02195165 A JPH02195165 A JP H02195165A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- condensing
- pressure
- data
- detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004378 air conditioning Methods 0.000 title description 2
- 230000008014 freezing Effects 0.000 title 1
- 238000007710 freezing Methods 0.000 title 1
- 239000003507 refrigerant Substances 0.000 claims abstract description 26
- 238000001704 evaporation Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract 2
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 238000012806 monitoring device Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 description 11
- 238000004781 supercooling Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 206010049633 Shoshin beriberi Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、冷凍・空調機の運転状況を管理する冷凍・
空調機用運転状態監視装置の改良に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] This invention is directed to a refrigeration/air conditioning system that manages the operating status of a refrigeration/air conditioner.
This invention relates to improvement of an operating state monitoring device for air conditioners.
（従来の技術〕
第４図、および第５図は、従来の冷凍・空調機用運転状
態監視装置のｍ成向、第６図は従来の中央制御装置に接
続されたＣＲＴの画面表示の一例である。図において、
ｌは中央制御装置で後述する信号収集記憶表；な２１〜
２ｎからのデータを管理するとともに、信号収集記憶表
ｆｉ！ ２１〜２ｎへ制御信号を出力するもので、信号
収集記憶装置２１〜２ｎとのデータの送受信を行なう伝
送Ｉ／Ｆ ６ 、信号収集記憶表＠２１〜２ｎのデータ
を分析表示する０ＲＴ２、データを演算する演算装［（
ＯＰＵ）７、データを記憶する記憶手段５、分析グラフ
およびデータを呼びｍＴキーボード３、及びデータを出
力するラインプリンタ４か接続されている。２１Ｓ２２
、・・・・・・、２ｎは信号収集記憶装置で、伝送線１
１Ｓ１２、・・・・・・、ｉｎにより中央制ＱＪＪ装［
１と接続されていて、中央制御装ｋｌとの伝送を行ない
、冷凍および空調機の運転状況信号の管理および、人出
力信号の制御・演算を行なう中央処理装置４１、冷凍お
よび空調機の各部温度を検出する温度検出器３１、各線
圧力を検出する圧力検出器に、保護装置（例えば高圧圧
力開閉器）の作動並びに復帰信号を検出する保護装置作
動検出器お、圧縮器が運転しているかどうか等を検出す
る接点状態検出４調からのデータを人力する人力インタ
フェイス４、上記人力データを記憶するＲＡＭ４４、冷
凍および空調機の保誇装置作動等の異常表示、運転表示
等を行なう表示部砺、中央制御表＠ｌとの伝送を行なう
伝送インタフェイス柘、冷凍・空調機の制御スイッチあ
へ運転ＯＮ、ＯＦＦ指令等の制御信号を出力する出力イ
ンタ７エイス４７、及び人力１／Ｆ 、出力１／Ｆ 、
伝送Ｉ／Ｆヘデータ送受傳のタイミングを取るクロック
パルス発生４胡等よりｆ＃成されていた。中央制御表＠
ｌは各１５号収集記憶装置１ｉ ２１〜２ｎからの人力
データを分析計算し、例えば冷凍・空＃４機の吐出圧力
が所定値以上の場合は、□ＲＴＺ上に第６図のように異
常発生（冷媒過充填警報）を表示し、異常通報するよう
に構成されていた。第６図に示す画面表示例の場合は２
号機が異常であることを通報していた。(Prior art) Fig. 4 and Fig. 5 show the m direction of a conventional operating state monitoring device for refrigeration and air conditioners, and Fig. 6 shows an example of the screen display of a CRT connected to a conventional central control device. In the figure,
l is the central control unit and is a signal collection storage table which will be described later;
In addition to managing data from 2n, the signal collection memory table fi! A transmission I/F 6 that outputs control signals to the signal collection and storage devices 21 to 2n and transmits and receives data to and from the signal collection and storage devices 21 to 2n, 0RT2 that analyzes and displays data in the signal collection and storage table @21 to 2n, The arithmetic unit [(
An OPU) 7, a storage means 5 for storing data, an mT keyboard 3 for calling analysis graphs and data, and a line printer 4 for outputting data are connected. 21S22
,..., 2n is a signal collection storage device, and transmission line 1
1S12,..., central system QJJ system [
A central processing unit 41 is connected to the central processing unit 41, which transmits data to the central control unit kl, manages operating status signals of the refrigeration and air conditioners, and controls and calculates human output signals, and controls the temperature of each part of the refrigeration and air conditioners. A temperature detector 31 detects the pressure of each line, a pressure detector detects the pressure of each line, a protective device operation detector detects the activation and return signal of a protective device (for example, a high pressure switch), and whether the compressor is operating or not. A human-powered interface 4 that manually inputs data from the contact state detection 4, which detects conditions such as the , transmission interface 柘 which performs transmission with the central control table @l, output interface 7 and 8 which outputs control signals such as operation ON and OFF commands to the control switch A of the refrigeration and air conditioner, and human power 1/F, output 1/F,
The clock pulse generation which takes the timing of data transmission/reception to the transmission I/F was made by f#. Central control table @
l analyzes and calculates the human data from each No. 15 collection and storage device 1i 21 to 2n. For example, if the discharge pressure of the refrigeration/air #4 machine is above a predetermined value, an abnormality will be displayed on the □ RTZ as shown in Figure 6. It was configured to display the occurrence (refrigerant overfill alarm) and report an abnormality. In the case of the screen display example shown in Figure 6, 2
It was reported that the unit was abnormal.
従来の装置は上記のように構成されており、冷媒過充填
状態を吐出圧力のみにより判定していたので、外気温度
が高い場合、吐出圧力が高くなるため、誤って冷媒過充
填警報を表示する場合があった。The conventional device was configured as described above, and the refrigerant overfill status was judged only based on the discharge pressure. Therefore, if the outside temperature was high, the discharge pressure would increase and a refrigerant overfill alarm would be displayed erroneously. There was a case.
この発明は上記のような問題点を解消するためになされ
たもので、冷媒過充填警報を正確に出すような冷凍・空
調機運転状態監視装置を得ることを目的とする◇
〔課題を解決するための手段〕
この発明は、信号収集記憶装置と、冷凍機、またけ空Ｗ
４機の運転状況データを記憶する記憶手段、上記データ
の演算２行なう演算装置、上記データを表示するＯＲＴ
、及び上記データを呼び出Ｔキーボードを匈えた中央制
御装置とからＷ或された冷凍・空調機運転状態監視装置
において、運転状況データより、・４８温度（凝縮圧力
の飽和温度）と外気湿度の差が所定値以上で、かつ凝縮
堝度（／４縮圧力の飽和温度）と凝縮器出口温度の差が
所定値以上のときに、冷媒過充填警報ご上記中央制御装
置の例えばＯＲＴ上に表示するようにしたものである。This invention was made to solve the above-mentioned problems, and its purpose is to obtain a refrigeration/air conditioner operating state monitoring device that accurately issues a refrigerant overfill alarm. [Means for] This invention provides a signal collection and storage device, a refrigerator, and a straddle air W.
Storage means for storing the operating status data of the four machines, an arithmetic unit for performing two calculations on the above data, and an ORT for displaying the above data.
, and call up the above data.In the refrigeration/air conditioner operating condition monitoring device, which is connected to the central control device with the T keyboard, from the operating condition data, ・48 temperature (condensing pressure saturation temperature) and outside air humidity When the difference is more than a predetermined value and the difference between the condensing temperature (saturation temperature of /4 condensing pressure) and the condenser outlet temperature is more than a predetermined value, a refrigerant overfill alarm is displayed on the central controller, for example, on the ORT. It was designed to do so.
この発明における冷凍・空調機運転状態監視装置は、運
転状況データより、凝縮温度と外気温度の差、過冷却度
（凝縮温度と凝縮器出口温度との差）から冷媒過充填状
態を検短するものである。The refrigeration/air conditioner operating state monitoring device of this invention detects the refrigerant overfilling state based on the difference between the condensing temperature and the outside air temperature and the degree of supercooling (the difference between the condensing temperature and the condenser outlet temperature) from the operating state data. It is something.
以下、この発明の一実施例２図について説明する。基本
的構成は第４図、第５図と同じである０第１図で圧１１
１、凝縮器部、膨張弁羽、蒸発４調から構成された冷媒
回路３有する冷凍機或いは空調機の、吐出ガス温度を検
出する湿度検出器３狐４縮器出口温度を検出する温度検
出器３１ｂ、吸入ガス温度を検出する温度検出器３１０
％冷却至の庫内温度２検出する温度検出ｄａｋｉ、蒸発
圧力を検出する圧力検出４鑞、凝縮圧力を検出する圧力
検出器（９）からデータを収集し、伝送Ｉ／Ｆ４６から
中央制御装置ｔの伝送Ｉ／Ｆ ６にデータを送る。第２
図のモリエル線図に示すように、冷媒過充填時は、通常
運転時に比較し、凝縮温度と外気温度の差および過冷却
度（凝縮γ富度と凝縮器出口温度の差）は増加する（
ＴＰ＋ ＜ ＴＰ ｍ 、８Ｃ１＜ ８０曾）。これは
冷媒過充填を行なうと冷媒液が上紀凝硼４５２内にもた
まり、伝熱面檀が減少するため、吐出圧力が高くなるの
で凝縮温度が増加し、過冷却度も増えるからである。Hereinafter, a second embodiment of the present invention will be described. The basic configuration is the same as in Figures 4 and 5.0 Pressure 11 in Figure 1
1. A refrigerant circuit composed of a condenser section, an expansion valve blade, and 4 evaporator sections. 3. A humidity detector for detecting the discharge gas temperature of a refrigerator or air conditioner having 3. 4. A temperature detector for detecting the condenser outlet temperature. 31b, temperature detector 310 for detecting intake gas temperature
Collect data from the temperature detector (2) which detects the internal temperature of the refrigerator (2), the pressure detector (4) which detects the evaporation pressure, and the pressure detector (9) which detects the condensation pressure, and transmits the data from the transmission I/F 46 to the central control unit (t). Send data to transmission I/F 6. Second
As shown in the Mollier diagram in the figure, when refrigerant is overfilled, the difference between the condensing temperature and the outside air temperature and the degree of supercooling (the difference between the condensed γ richness and the condenser outlet temperature) increase (
TP+ < TP m, 8C1 < 80 so). This is because when refrigerant overfilling is carried out, the refrigerant liquid accumulates in the Joki condensation chamber 452, reducing the heat transfer surface, increasing the discharge pressure, increasing the condensation temperature, and increasing the degree of supercooling. .
第８図の７０−チャートのように、中央制御装置ｔ １
の演算装置７で凝縮圧力および蒸発圧力を凝ｗ４温度、
蒸発温度に換算し、′／＃縮温層温度気温度の差ＴＰ、
過冷却度ＳＯを計算し、凝縮温度と外気温度の差ＴＰが
所定値五以上で、かつ過冷却度８０が所定値８以上の場
合、冷媒過充填の可能性が大であるとして中央制御装置
１１１のＯＲＴ ２に冷媒過充填警報を表示する。As shown in the 70-chart of FIG. 8, the central controller t 1
The arithmetic unit 7 converts the condensation pressure and evaporation pressure into the condensation w4 temperature,
Converted to evaporation temperature, '/#condensing layer temperature difference TP,
The degree of supercooling SO is calculated, and if the difference TP between the condensing temperature and the outside air temperature is a predetermined value of 5 or more, and the degree of supercooling 80 is a predetermined value of 8 or more, the central controller determines that there is a high possibility of refrigerant overfilling. A refrigerant overfill alarm is displayed on ORT 2 of 111.
冷媒過充填であるかどうかの判定は、；ｆｉ、４却度で
もある程度判定できるか、ドライヤの詰まりなどの場合
は、冷媒が蒸発器に流れないため、過冷却度が増加する
ので、過冷却度だけではｄ媒過充填かドライヤ等の詰ま
りかどうかの判定がむつかしい。To determine whether refrigerant is overfilled, it can be determined to some extent even at 4 degrees Fahrenheit, or if the dryer is clogged, the degree of supercooling increases because the refrigerant does not flow to the evaporator. It is difficult to determine whether the d-medium is overfilled or the dryer is clogged based on the temperature alone.
ｆた、凝縮器が目詰まりした場合は、凝縮器の伝熱面積
が少なくなるので、同じ凝縮能力を出そうとすると凝Ｗ
！温度と外度温度の差が大きくなり、凝縮温度と外気温
度の差だけでは凝縮器の目詰まりか冷媒過充填かどうか
の判定がむつかしい。Furthermore, if the condenser is clogged, the heat transfer area of the condenser will decrease, so if you try to produce the same condensing capacity, the condensation W will increase.
! The difference between the temperature and the outside temperature becomes large, and it is difficult to determine whether the condenser is clogged or refrigerant is overfilled just by looking at the difference between the condensing temperature and the outside temperature.
この発明では、過冷却度と凝縮湿度と外気温度の差の複
数個のデータでチエツクしているので、正確に冷媒過充
填を判定できる。In this invention, since a plurality of data such as the degree of subcooling, the condensed humidity, and the difference in outside air temperature are checked, refrigerant overfilling can be accurately determined.
Ｅ発明の効果〕
以上のように、この発明は、信号収集記憶装置と、冷凍
機または空調機の運転状況データな記憶する記憶手段、
上記データの演算を行なう演算装置、上記データを表示
するＯＲＴ、及び上記データを呼び吊すキーボードを備
えた中央処理装置とから構成された冷凍・空：Ｉ！４機
運転状態監視装置において、上記運転状況データより凝
縮温度と外気温度の差、過冷却度の複数個のデータによ
り冷媒過充填を判断するので、正確に冷媒過充填が検出
でき、また冷媒過充填によりシステムダウンする前に故
障を発見できる効果がある。E Effects of the Invention As described above, the present invention provides a signal collection and storage device, a storage means for storing operating status data of a refrigerator or an air conditioner,
Refrigeration/Sky:I! consists of a calculation unit that performs calculations on the above data, an ORT that displays the above data, and a central processing unit equipped with a keyboard that calls up the above data. The 4-unit operating condition monitoring system uses multiple pieces of data such as the difference between the condensing temperature and outside temperature and the degree of supercooling to determine refrigerant overfilling based on the operating status data, so refrigerant overfilling can be accurately detected and refrigerant overfilling can be detected. Filling has the effect of discovering failures before the system goes down.
第１図はこの発明に係る冷凍機或いは空調機の温度及び
圧力検出位置説明図、第２図は液バツク状態を示すモリ
エル線図、第８図はこの発明の一実デシ例を示す中央制
御装置の演算フローチャート、第４図および第５図は従
来の冷凍・空調機用運転状態監視装置の構成図、第６図
は在米装置におけるＣＲＴの表示説明図である。
図中、ｌは中央制御装置、２はＯＲＴ、３はキーボード
、鴫はラインプリンタ、５は記憶手段、６は伝送１／Ｆ
、１１、Ｌ・・・１ｎは伝送線、２１は信号収集記憶装
置、３１ａＪ１ｈ３１ａＪｄは温度検出器、ム謡は圧力
検出器、４１は中央処理装置、４３は人力インタフェイ
ス、４４はＲＡ Ｍ Ｓ４５は表示部、恥は伝送インタ
フェイス、４７は出力インタフェイス、絽はクロックパ
ルス発生器、５１は圧縮器、５２は凝縮器、おけ膨張弁
、５４は蒸発器である。
なお図中同一符号は同一または相当部分をボす。
代理人 大 岩 増 雄
第１０
ｎ 証心各
ζＪ：勲采省
９４Ｎ、斃塊
第２２
達常ｊ軸時
Ｃや妖通針浮へ
第４Ａ
第３図
Ｑ尺Ｔ ＬネFig. 1 is an explanatory diagram of the temperature and pressure detection positions of a refrigerator or air conditioner according to the present invention, Fig. 2 is a Mollier diagram showing the liquid back state, and Fig. 8 is a central control diagram showing an example of the present invention. A calculation flowchart of the device, FIGS. 4 and 5 are block diagrams of a conventional operating state monitoring device for refrigerators and air conditioners, and FIG. 6 is an explanatory diagram of a CRT display in the device located in the United States. In the figure, 1 is the central control unit, 2 is the ORT, 3 is the keyboard, 1 is the line printer, 5 is the storage means, 6 is the transmission 1/F
, 11, L...1n are transmission lines, 21 is a signal collection storage device, 31aJ1h31aJd is a temperature detector, music is a pressure detector, 41 is a central processing unit, 43 is a human power interface, 44 is a RAM S45 The display section is a transmission interface, 47 is an output interface, 51 is a clock pulse generator, 51 is a compressor, 52 is a condenser, an expansion valve, and 54 is an evaporator. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Oiwa Masu Yu No. 10 n Shoshin each ζJ: Hun Chai Sho 94N, Futan No. 22 Datsujyo j-axis time C and Youtsu needle floating No. 4A Figure 3 Q-shaku T L ne
Claims (1)
冷媒回路を有する冷凍機或いは空調機の、吐出ガス温度
、凝縮温度、凝縮器出口温度、蒸発温度、吸入ガス温度
および冷却室の庫内温度の入力信号を入力する入力イン
ターフェイスおよび伝送制御を行なう中央処理装置を備
えた信号収集記憶装置と、上記信号収集記憶装置から伝
送されたデータを記憶する記憶手段、上記入力データを
演算および基準設定値と比較判定する演算装置を備えた
中央制御装置とから構成されたものにおいて、上記凝縮
温度（凝縮圧力の飽和温度）と外気温度の差が所定値以
上で、かつ凝縮温度と凝縮器出口温度の差が所定値以上
のときに、冷媒過充填警報を上記中央制御装置に出すよ
うにしたことを特徴とする冷凍・空調機運転状態監視装
置。Discharge gas temperature, condensation temperature, condenser outlet temperature, evaporation temperature, intake gas temperature, and inside of the cooling room of a refrigerator or air conditioner that has a refrigerant circuit consisting of a compressor, condenser, expansion valve, and evaporator. A signal collection storage device equipped with an input interface for inputting a temperature input signal and a central processing unit for controlling transmission, a storage means for storing data transmitted from the signal collection storage device, and a calculation and reference setting for the input data. and a central control unit equipped with an arithmetic unit that compares and determines the value, and the difference between the condensing temperature (saturation temperature of condensing pressure) and the outside air temperature is a predetermined value or more, and the condensing temperature and the condenser outlet temperature are A refrigerating/air conditioner operating state monitoring device, characterized in that a refrigerant overfill alarm is issued to the central control device when the difference between the two is greater than a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1295889A JPH02195165A (en) | 1989-01-21 | 1989-01-21 | Freezing and air conditioning state monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1295889A JPH02195165A (en) | 1989-01-21 | 1989-01-21 | Freezing and air conditioning state monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02195165A true JPH02195165A (en) | 1990-08-01 |
Family
ID=11819770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1295889A Pending JPH02195165A (en) | 1989-01-21 | 1989-01-21 | Freezing and air conditioning state monitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02195165A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4124363A1 (en) * | 1991-07-23 | 1993-01-28 | Daimler Benz Ag | METHOD FOR MONITORING THE REFRIGERANT LEVEL IN A REFRIGERATION PLANT |
| JP2007212078A (en) * | 2006-02-10 | 2007-08-23 | Fujitsu General Ltd | Air-conditioner control device |
| US7419192B2 (en) | 2005-07-13 | 2008-09-02 | Carrier Corporation | Braze-free connector utilizing a sealant coated ferrule |
| US7472557B2 (en) | 2004-12-27 | 2009-01-06 | Carrier Corporation | Automatic refrigerant charging apparatus |
| JP2009014268A (en) * | 2007-07-04 | 2009-01-22 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| US7552596B2 (en) | 2004-12-27 | 2009-06-30 | Carrier Corporation | Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication |
| US7610765B2 (en) | 2004-12-27 | 2009-11-03 | Carrier Corporation | Refrigerant charge status indication method and device |
| JP2010025545A (en) * | 2009-11-02 | 2010-02-04 | Mitsubishi Electric Corp | Refrigerant filling method for refrigerating air conditioner and refrigerant charge device for refrigerating air conditioner |
| US7712319B2 (en) | 2004-12-27 | 2010-05-11 | Carrier Corporation | Refrigerant charge adequacy gauge |
| US9759465B2 (en) | 2011-12-27 | 2017-09-12 | Carrier Corporation | Air conditioner self-charging and charge monitoring system |
-
1989
- 1989-01-21 JP JP1295889A patent/JPH02195165A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4124363A1 (en) * | 1991-07-23 | 1993-01-28 | Daimler Benz Ag | METHOD FOR MONITORING THE REFRIGERANT LEVEL IN A REFRIGERATION PLANT |
| US7472557B2 (en) | 2004-12-27 | 2009-01-06 | Carrier Corporation | Automatic refrigerant charging apparatus |
| US7552596B2 (en) | 2004-12-27 | 2009-06-30 | Carrier Corporation | Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication |
| US7610765B2 (en) | 2004-12-27 | 2009-11-03 | Carrier Corporation | Refrigerant charge status indication method and device |
| US7712319B2 (en) | 2004-12-27 | 2010-05-11 | Carrier Corporation | Refrigerant charge adequacy gauge |
| US7419192B2 (en) | 2005-07-13 | 2008-09-02 | Carrier Corporation | Braze-free connector utilizing a sealant coated ferrule |
| JP2007212078A (en) * | 2006-02-10 | 2007-08-23 | Fujitsu General Ltd | Air-conditioner control device |
| JP2009014268A (en) * | 2007-07-04 | 2009-01-22 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| JP2010025545A (en) * | 2009-11-02 | 2010-02-04 | Mitsubishi Electric Corp | Refrigerant filling method for refrigerating air conditioner and refrigerant charge device for refrigerating air conditioner |
| US9759465B2 (en) | 2011-12-27 | 2017-09-12 | Carrier Corporation | Air conditioner self-charging and charge monitoring system |
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