JPH08261543A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH08261543A JPH08261543A JP7060589A JP6058995A JPH08261543A JP H08261543 A JPH08261543 A JP H08261543A JP 7060589 A JP7060589 A JP 7060589A JP 6058995 A JP6058995 A JP 6058995A JP H08261543 A JPH08261543 A JP H08261543A
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- heat exchanger
- indoor heat
- input current
- air conditioner
- 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
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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は空気調和機に係わり、詳
しくは、冷凍サイクルの冷媒不足を早期に検知し、圧縮
機を保護するための手段に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to a means for early detecting a refrigerant shortage in a refrigeration cycle and protecting a compressor.
【０００２】[0002]
【従来の技術】空気調和機の冷凍サイクルは冷媒配管で
環状に接続された圧縮機と、四方弁と、室外熱交換器
と、絞り手段と、室内熱交換器とからなり、圧縮機への
電力はインバータ装置を介して供給されるようになって
いる。インバータ装置の一次側には入力電流を検出する
入力電流検出手段が設けられており、検出データは室外
機制御部のマイクロコンピュータに入力されるようにな
っている。マイクロコンピュータは検出入力電流値が許
容値を超えると、インバータ装置を制御して圧縮機の運
転周波数を下げ、入力電流を許容値以下に抑えることに
より、圧縮機を過負荷状態から保護するようになってい
る。2. Description of the Related Art The refrigeration cycle of an air conditioner comprises a compressor annularly connected by a refrigerant pipe, a four-way valve, an outdoor heat exchanger, a throttle means, and an indoor heat exchanger. Electric power is supplied through the inverter device. Input current detecting means for detecting an input current is provided on the primary side of the inverter device, and the detection data is input to the microcomputer of the outdoor unit controller. When the detected input current value exceeds the allowable value, the microcomputer protects the compressor from overload by controlling the inverter device to reduce the operating frequency of the compressor and keeping the input current below the allowable value. Has become.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述の
ような過負荷保護機能を有する空気調和機であっても、
冷凍サイクルの冷媒量が漏れなどにより不足していると
圧縮機の負荷が小さくなり入力電流が少なくなるため、
圧縮機の温度（吐出管温度）が許容値まで上昇したとき
でも入力電流は過負荷保護機能を動作させるまでに上昇
せず、圧縮機を保護することができないという問題があ
る。したがって、本発明においては、冷凍サイクルの冷
媒不足により圧縮機の温度が保護すべき温度まで上昇し
たとき入力電流の検出値に頼ることなく、圧縮機を保護
することのできる空気調和機を提供することを目的とし
ている。However, even in the air conditioner having the above-mentioned overload protection function,
If the amount of refrigerant in the refrigeration cycle is insufficient due to leakage, etc., the load on the compressor will decrease and the input current will decrease.
Even when the temperature of the compressor (discharge pipe temperature) rises to an allowable value, the input current does not rise until the overload protection function is activated, and there is a problem that the compressor cannot be protected. Therefore, the present invention provides an air conditioner capable of protecting a compressor without relying on the detected value of the input current when the temperature of the compressor rises to a temperature to be protected due to lack of refrigerant in the refrigeration cycle. Is intended.
【０００４】[0004]
【課題を解決するための手段】本発明は上記の課題を解
決するためになされたものであり、圧縮機、四方弁、室
外熱交換器、絞り手段、室内熱交換器からなる冷凍サイ
クルと、前記圧縮機への入力電流を検出する入力電流検
出手段を有し、冷房運転中の入力電流が許容値を超えな
いように圧縮機の運転周波数を制御することにより、圧
縮機を過負荷状態から保護するようにしてなる空気調和
機において、前記室内熱交換器の中間部に温度検出手段
を設け、同温度検出手段により検出される冷房運転時の
中間温度が所定値以上で、所定時間継続したとき、前記
圧縮機の運転を停止させるようにした。The present invention has been made to solve the above-mentioned problems, and includes a refrigeration cycle including a compressor, a four-way valve, an outdoor heat exchanger, a throttle means and an indoor heat exchanger, It has an input current detection means for detecting the input current to the compressor, by controlling the operating frequency of the compressor so that the input current during cooling operation does not exceed the allowable value, the compressor from the overload state. In an air conditioner to be protected, a temperature detecting means is provided in an intermediate part of the indoor heat exchanger, and the intermediate temperature during the cooling operation detected by the temperature detecting means is a predetermined value or more and continued for a predetermined time. At this time, the operation of the compressor was stopped.
【０００５】[0005]
【作用】冷房運転においては、圧縮機から吐出する高温
のガス冷媒が四方弁を経て室外熱交換器に流入した後、
絞り手段、室内熱交換器を通り、再度四方弁を経て圧縮
機に戻るが、この冷凍サイクルを循環する冷媒量が不足
していると室内熱交換器での蒸発が早くなってしまい、
室内熱交換器の中間温度が、冷媒量が十分にある場合に
比較して高くなる。上記の手段はこの点に着目してなさ
れたものであり、室内熱交換器の中間温度が所定値以上
で所定時間継続したら冷凍サイクルの冷媒量が不足して
いると判断して圧縮機の運転を停止させるようになって
いるので、圧縮機を冷媒量不足による異常運転から保護
することができる。In the cooling operation, after the high temperature gas refrigerant discharged from the compressor flows into the outdoor heat exchanger through the four-way valve,
After passing through the throttling means and the indoor heat exchanger, it returns to the compressor via the four-way valve again, but if the amount of refrigerant circulating in this refrigeration cycle is insufficient, evaporation in the indoor heat exchanger will become faster,
The intermediate temperature of the indoor heat exchanger becomes higher than when the amount of refrigerant is sufficient. The above-mentioned means was made paying attention to this point, and when the intermediate temperature of the indoor heat exchanger is equal to or higher than a predetermined value and continues for a predetermined time, it is determined that the refrigerant amount in the refrigeration cycle is insufficient and the compressor is operated. Is stopped, it is possible to protect the compressor from abnormal operation due to insufficient amount of refrigerant.
【０００６】[0006]
【実施例】以下、本発明の実施例を図１〜図３に基づい
て説明する。図１は空気調和機の基本的な冷凍サイクル
とその制御系の概略を表したもので、１は圧縮機、２は
冷媒の流れを切り換える四方弁、３は室外熱交換器、４
はキャピラリーチューブ等を用いた絞り手段、５は室内
熱交換器、６は室外熱交換器５等を空冷する室外送風
機、７は室内熱交換器５によって熱交換された空気を室
内へ送出するための室内送風機、８は室内熱交換器５の
中間温度を検出する温度検出手段（温度センサ）であ
る。冷房運転時の冷媒は１，２，３，４，５の順に流
れ、再度、四方弁２を経由して圧縮機１に戻るようにな
っている。圧縮機１への電力は室外機制御部９によって
制御されるインバータ装置１０を介して供給されるよう
になっており、このインバータ装置１０の一次側には入
力電流を検出するための入力電流検出手段１１が設けら
れている。Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows an outline of a basic refrigeration cycle of an air conditioner and its control system. 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant, 3 is an outdoor heat exchanger, 4
Is a throttle means using a capillary tube or the like, 5 is an indoor heat exchanger, 6 is an outdoor blower for air-cooling the outdoor heat exchanger 5, etc., and 7 is for sending the air heat-exchanged by the indoor heat exchanger 5 into the room. The indoor blower is a temperature detecting means (temperature sensor) 8 for detecting an intermediate temperature of the indoor heat exchanger 5. During the cooling operation, the refrigerant flows in the order of 1, 2, 3, 4, 5 and returns to the compressor 1 via the four-way valve 2 again. Electric power to the compressor 1 is supplied via an inverter device 10 controlled by an outdoor unit control unit 9, and an input current detection for detecting an input current is provided on the primary side of the inverter device 10. Means 11 are provided.
【０００７】室外機制御部９は入力電流検出手段１１に
より検出された入力電流値が許容値を超えているとイン
バータ装置１０を制御して圧縮機１の運転周波数を下
げ、入力電流を許容値以下に抑えて圧縮機１を過負荷状
態から保護するようになっている。一方、室内機制御部
１２では冷房運転時に温度検出手段８から得る室内熱交
換器５の中間温度が所定値以上で、所定時間継続すると
冷凍サイクルが冷媒不足になっていると判定し、室外機
制御部９に対して圧縮機１の運転停止を命ずる信号を発
するとともに、室内機側に設けられている報知部１３に
信号を送り、機器が異常（冷媒不足）であることを報知
するようになっている。When the input current value detected by the input current detecting means 11 exceeds the allowable value, the outdoor unit control section 9 controls the inverter device 10 to reduce the operating frequency of the compressor 1 to reduce the input current to the allowable value. The compressor 1 is protected from overload by suppressing the pressure to the following. On the other hand, the indoor unit controller 12 determines that the intermediate temperature of the indoor heat exchanger 5 obtained from the temperature detecting means 8 during the cooling operation is equal to or higher than a predetermined value and continues for a predetermined time, and the refrigeration cycle is out of refrigerant, and the outdoor unit is determined. A signal is issued to the control unit 9 to stop the operation of the compressor 1, and a signal is sent to the notification unit 13 provided on the indoor unit side to notify that the device is abnormal (insufficient refrigerant). Has become.
【０００８】図２は上述の制御動作をフローチャートで
表したもので、冷房運転が開始されると、ステップＳＴ
１では温度検出手段８により室内熱交換器５の中間温度
Ｔが検出される。ステップＳＴ２ではステップＳＴ１で
得た室内熱交換器５の中間温度Ｔが冷媒不足の判定基準
値としてメモリーに記憶されている値（Ａ℃）よりも大
きいかどうかを比較し、室内熱交換器５の中間温度Ｔが
判定基準値Ａよりも大きい場合にはステップＳＴ３でタ
イマーをセットし、ステップＳＴ４で所定時間（数分）
が経過するのを待つ。FIG. 2 is a flow chart showing the above control operation. When the cooling operation is started, step ST
In 1, the intermediate temperature T of the indoor heat exchanger 5 is detected by the temperature detecting means 8. In step ST2, it is compared whether or not the intermediate temperature T of the indoor heat exchanger 5 obtained in step ST1 is larger than the value (A ° C.) stored in the memory as the criterion value for the refrigerant shortage, and the indoor heat exchanger 5 is compared. If the intermediate temperature T is higher than the judgment reference value A, a timer is set in step ST3, and a predetermined time (several minutes) is set in step ST4.
Wait for.
【０００９】その後、ステップＳＴ５およびステップＳ
Ｔ６で、先に実行したステップＳＴ１およびステップＳ
Ｔ２の作業と同じ作業を実行し、室内熱交換器５の中間
温度Ｔが判定基準値Ａ以下であれば冷凍サイクルの冷媒
量に不足はないものとしてステップＳＴ１に戻し、も
し、中間温度Ｔが判定基準値Ａ以上であれば冷媒量が不
足しているものとして、ステップＳＴ７で圧縮機１の運
転停止を命ずるとともに、ステップＳＴ８で室内機側に
設けられている報知部１３から異常を報知する。なお、
本実施例においては冷凍サイクルが冷媒不足であるかど
うかを二回の判定から判断するようになっているが、こ
れは冷房運転開始直後などにおいて室内熱交換器５の中
間温度Ｔが一時的に判定基準値Ａを超えたのであるかど
うかを見極めるための手段である。After that, step ST5 and step S
At T6, the previously executed steps ST1 and S
If the intermediate temperature T of the indoor heat exchanger 5 is equal to or lower than the determination reference value A, the same operation as the operation of T2 is performed, and it is determined that the refrigerant amount of the refrigeration cycle is not insufficient, and the process returns to step ST1. If it is equal to or more than the determination reference value A, it is determined that the amount of refrigerant is insufficient, and in step ST7, the operation stop of the compressor 1 is ordered, and in step ST8, an abnormality is notified from the notification unit 13 provided on the indoor unit side. . In addition,
In the present embodiment, whether or not the refrigeration cycle is short of refrigerant is judged from two judgments. This is because the intermediate temperature T of the indoor heat exchanger 5 is temporarily changed immediately after the start of the cooling operation. This is a means for determining whether or not the judgment reference value A has been exceeded.
【００１０】図３はもう一つの実施例を示したもので、
冷房運転が開始されると、ステップＳＴ１でタイマーを
セットし、ステップＳＴ２で所定時間（数分）が経過す
るのを待ち、所定時間が経過するとステップＳＴ３でタ
イマーをリセットし、ステップＳＴ４で室内熱交換器５
の中間温度Ｔを検出する。ステップＳＴ５では検出され
た中間温度Ｔが冷媒不足の判定基準値Ａ（℃）よりも大
きいかどうかを比較判定する。そして、中間温度Ｔが判
定基準値Ａ以下であれば冷媒量に不足はないものとして
ステップＳＴ１に戻し、もし、中間温度Ｔが判定基準値
Ａ以上であれば冷媒量が不足しているものとして、ステ
ップＳＴ６で圧縮機１の運転停止を命ずるとともに、ス
テップＳＴ７で異常を報知する。なお、本実施例におい
ては、冷房運転開始から室内熱交換器５の中間温度Ｔを
検出するまでに時間待ちを行うようになっているが、こ
れは冷凍サイクルの冷媒不足をより正確に判断するため
の手段である。FIG. 3 shows another embodiment.
When the cooling operation is started, a timer is set in step ST1, waits for a predetermined time (several minutes) to elapse in step ST2, and when the predetermined time elapses, the timer is reset in step ST3, and the indoor heat in step ST4. Exchanger 5
The intermediate temperature T of is detected. In step ST5, it is determined whether or not the detected intermediate temperature T is higher than the determination reference value A (° C.) of the refrigerant shortage. Then, if the intermediate temperature T is equal to or lower than the determination reference value A, it is determined that the amount of the refrigerant is not insufficient, and the process returns to step ST1. If the intermediate temperature T is equal to or higher than the determination reference value A, the amount of the refrigerant is insufficient. The operation of the compressor 1 is ordered to stop in step ST6, and the abnormality is notified in step ST7. In the present embodiment, the time waiting is performed from the start of the cooling operation to the detection of the intermediate temperature T of the indoor heat exchanger 5, but this more accurately determines the refrigerant shortage in the refrigeration cycle. Is a means to
【００１１】[0011]
【発明の効果】以上説明したような制御機能を備えた空
気調和機であるならば、冷凍サイクルの冷媒不足がより
速やかに、かつ、より正確に検出されて圧縮機の運転が
停止されることにより、圧縮機が冷媒不足による異常運
転から保護され、空気調和機としての安全性が向上する
とともに、室内機側の報知部には異常報知がなされるの
で冷媒補給などの事後対策が容易に行えることになる。With the air conditioner having the control function as described above, the shortage of the refrigerant in the refrigeration cycle can be detected more quickly and more accurately, and the operation of the compressor can be stopped. As a result, the compressor is protected from abnormal operation due to lack of refrigerant, the safety as an air conditioner is improved, and an abnormality notification is given to the notification unit on the indoor unit side, so that it is possible to easily take subsequent measures such as refrigerant replenishment. It will be.
【図１】本発明に係わる空気調和機の冷凍サイクルとそ
の制御系の概略図である。FIG. 1 is a schematic diagram of a refrigeration cycle of an air conditioner according to the present invention and its control system.
【図２】本発明の第１の制御動作例を表すフローチャー
トである。FIG. 2 is a flowchart showing a first control operation example of the present invention.
【図３】本発明の第２の制御動作例を表すフローチャー
トである。FIG. 3 is a flowchart showing a second control operation example of the present invention.
１ 圧縮機 ２ 四方弁 ３ 室外熱交換器 ４ 絞り手段 ５ 室内熱交換器 ６ 室外送風機 ７ 室内送風機 ８ 温度検出手段 ９ 室外機制御部 １０ インバータ装置 １１ 入力電流検出手段 １２ 室内機制御部 １３ 報知部 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Throttle means 5 Indoor heat exchanger 6 Outdoor blower 7 Indoor blower 8 Temperature detection means 9 Outdoor unit control section 10 Inverter device 11 Input current detection means 12 Indoor unit control section 13 Notification section
Claims (4)
段、室内熱交換器からなる冷凍サイクルと、前記圧縮機
への入力電流を検出する入力電流検出手段を有し、冷房
運転中の入力電流が許容値を超えないように圧縮機の運
転周波数を制御することにより、圧縮機を過負荷状態か
ら保護するようにしてなる空気調和機において、前記室
内熱交換器の中間部に温度検出手段を設け、同温度検出
手段により検出される冷房運転時の中間温度が所定値以
上で、所定時間継続したとき、前記圧縮機の運転を停止
させるようにしてなることを特徴とする空気調和機。1. A refrigeration cycle including a compressor, a four-way valve, an outdoor heat exchanger, a throttle means, and an indoor heat exchanger, and an input current detection means for detecting an input current to the compressor, which is in a cooling operation. In the air conditioner configured to protect the compressor from the overload condition by controlling the operating frequency of the compressor so that the input current of the compressor does not exceed the allowable value, the temperature in the middle part of the indoor heat exchanger An air conditioner characterized by being provided with a detection means, and when the intermediate temperature during the cooling operation detected by the temperature detection means is a predetermined value or more and continues for a predetermined time, the operation of the compressor is stopped. Machine.
段、室内熱交換器からなる冷凍サイクルと、前記圧縮機
への入力電流を検出する入力電流検出手段を有し、冷房
運転中の入力電流が許容値を超えないように圧縮機の運
転周波数を制御することにより、圧縮機を過負荷状態か
ら保護するようにしてなる空気調和機において、前記室
内熱交換器の中間部に温度検出手段を設け、同温度検出
手段により検出される冷房運転時の中間温度が所定値を
超えているときは所定時間経過後に再度、前記室内熱交
換器の中間温度を検出し、検出値が所定値を超えている
ときは、前記圧縮機の運転を停止させるようにしてなる
ことを特徴とする空気調和機。2. A refrigeration cycle including a compressor, a four-way valve, an outdoor heat exchanger, a throttle means, and an indoor heat exchanger, and an input current detection means for detecting an input current to the compressor, which is in a cooling operation. In the air conditioner configured to protect the compressor from the overload condition by controlling the operating frequency of the compressor so that the input current of the compressor does not exceed the allowable value, the temperature in the middle part of the indoor heat exchanger A detection means is provided, and when the intermediate temperature during the cooling operation detected by the temperature detection means exceeds a predetermined value, the intermediate temperature of the indoor heat exchanger is detected again after a lapse of a predetermined time, and the detected value becomes a predetermined value. An air conditioner characterized in that when the value exceeds the value, the operation of the compressor is stopped.
段、室内熱交換器からなる冷凍サイクルと、前記圧縮機
への入力電流を検出する入力電流検出手段を有し、冷房
運転中の入力電流が許容値を超えないように圧縮機の運
転周波数を制御することにより、圧縮機を過負荷状態か
ら保護するようにしてなる空気調和機において、前記室
内熱交換器の中間部に温度検出手段を設け、冷房運転開
始から所定時間が経過したら前記温度検出手段により室
内熱交換器の中間温度を検出し、検出値が所定値を超え
ているときは、前記圧縮機の運転を停止させるようにし
てなることを特徴とする空気調和機。3. A refrigeration cycle including a compressor, a four-way valve, an outdoor heat exchanger, a throttle means, and an indoor heat exchanger, and an input current detection means for detecting an input current to the compressor, which is in a cooling operation. In the air conditioner configured to protect the compressor from the overload condition by controlling the operating frequency of the compressor so that the input current of the compressor does not exceed the allowable value, the temperature in the middle part of the indoor heat exchanger Detecting means is provided, the intermediate temperature of the indoor heat exchanger is detected by the temperature detecting means when a predetermined time has elapsed from the start of the cooling operation, and the operation of the compressor is stopped when the detected value exceeds the predetermined value. An air conditioner that is characterized in that
度が所定値を超えて圧縮機の運転が停止されたとき、室
内機側の報知部から機器の異常を報知するようにしてな
る請求項１〜３記載の空気調和機。4. When the intermediate temperature during the cooling operation of the indoor heat exchanger exceeds a predetermined value and the operation of the compressor is stopped, the alarm unit on the indoor unit side notifies the abnormality of the device. The air conditioner according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7060589A JPH08261543A (en) | 1995-03-20 | 1995-03-20 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7060589A JPH08261543A (en) | 1995-03-20 | 1995-03-20 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08261543A true JPH08261543A (en) | 1996-10-11 |
Family
ID=13146583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7060589A Pending JPH08261543A (en) | 1995-03-20 | 1995-03-20 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08261543A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US7552596B2 (en) | 2004-12-27 | 2009-06-30 | Carrier Corporation | Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication |
| US7712319B2 (en) | 2004-12-27 | 2010-05-11 | Carrier Corporation | Refrigerant charge adequacy gauge |
| CN101749885A (en) * | 2008-12-11 | 2010-06-23 | 株式会社富士通将军股份有限公司 | Refrigeration apparatus |
| US9759465B2 (en) | 2011-12-27 | 2017-09-12 | Carrier Corporation | Air conditioner self-charging and charge monitoring system |
| CN107152758A (en) * | 2017-05-22 | 2017-09-12 | 广东美的制冷设备有限公司 | Air conditioner anti-freeze protects control method and device |
-
1995
- 1995-03-20 JP JP7060589A patent/JPH08261543A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN101749885A (en) * | 2008-12-11 | 2010-06-23 | 株式会社富士通将军股份有限公司 | Refrigeration apparatus |
| US9759465B2 (en) | 2011-12-27 | 2017-09-12 | Carrier Corporation | Air conditioner self-charging and charge monitoring system |
| CN107152758A (en) * | 2017-05-22 | 2017-09-12 | 广东美的制冷设备有限公司 | Air conditioner anti-freeze protects control method and device |
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