JPS5932739A - Tap-controlled hot water supply system - Google Patents

Tap-controlled hot water supply system

Info

Publication number
JPS5932739A
JPS5932739A JP57144525A JP14452582A JPS5932739A JP S5932739 A JPS5932739 A JP S5932739A JP 57144525 A JP57144525 A JP 57144525A JP 14452582 A JP14452582 A JP 14452582A JP S5932739 A JPS5932739 A JP S5932739A
Authority
JP
Japan
Prior art keywords
hot water
water temperature
temperature
tap
controlled
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
Application number
JP57144525A
Other languages
Japanese (ja)
Inventor
Toru Kobayashi
徹 小林
Tatsuo Saka
達男 坂
Shinji Miyauchi
伸二 宮内
Yumi Imanaka
今中　由美
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP57144525A priority Critical patent/JPS5932739A/en
Publication of JPS5932739A publication Critical patent/JPS5932739A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/305—Control of valves
    • F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Combustion (AREA)

Abstract

PURPOSE:To enable to set the hot water temperature by directly operating a tap in use without being influenced by the set hot water temperature at another tap by a method wherein burning rate is controlled by a gas proportional control valve so as to equalize the temperature of hot water from a tap-controlled hot water supplier to the maximum value of hot water temperatures set by a plurality of mixing taps. CONSTITUTION:A temperature control circuit 7a compares hot water temperatures T1 and T2 set at the mixer taps 13 and 14 with each other so as to adopt the maximum hot water temperature as the set value of the reference hot water temperature. On the other hand, the flow rate of gas and consequently the burning rate of a burner is controlled by controlling the gas proportional control valve 5 so as to equalize the temperature Tc of hot water from the tap-controlled hot water supplier 1 detected by a hot water temperature detector 6 arranged in the vicinity 2 of the outlet of the supplier 1 to the set value of the reference hot water temperature. In such a manner as mentioned above, the independent setting of hot water temperature at each mixing tap is made possible.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、瞬間式給湯機の給湯温度制御方式と構成に関
する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water temperature control method and structure for an instantaneous hot water heater.

従来例の構成とその問題点 従来、ガス比例制御弁を搭載した瞬間給湯機は第１図に
示すようなシステム構成音とっている。Conventional configuration and its problems Conventionally, an instantaneous water heater equipped with a gas proportional control valve has a system configuration as shown in FIG.

第１図において、１は給湯機本体であり、バーナ４と熱
交換部３を含む。給湯機の出口付近２には、ザーミスタ
など湯温検知器６が配置さｉｔている。５はガン比例制
御弁であり−、ガス配管１２につながる。７に、温度制
御回路、８け湯温設定部である。９および１ｏＶｉ水栓
である。以」二のような構成において、湯温設定部８で
湯温−１５：設定すると、温度制御１回路７は、出口２
の湯温か、設定値になるよう（Ｃ、ガス比例制御弁５に
よって燃焼聞−を制御するので、給湯機の出湯温１隻は
、常に設定値に保たれるが、使用上つぎのような問題を
有し、でいる。In FIG. 1, reference numeral 1 denotes a water heater main body, which includes a burner 4 and a heat exchange section 3. A hot water temperature detector 6 such as a thermistor is arranged near the outlet 2 of the water heater. 5 is a gun proportional control valve and is connected to the gas pipe 12. 7 is a temperature control circuit, and 8 is a hot water temperature setting section. 9 and 1oVi faucet. In the configuration as described above, when the hot water temperature setting section 8 sets the hot water temperature to -15:, the temperature control circuit 1
Since the combustion period is controlled by the gas proportional control valve 5, the hot water temperature at the outlet of the hot water heater is always kept at the set value. I have a problem.

ｔｌ）２１ｆＡ］以上の水栓がある場合において、各々
の水栓からの出湯温度は、給湯機の出湯温度で決捷る。tl) 21fA] or more, the temperature of hot water from each faucet is determined by the temperature of hot water from the water heater.

したがって、水栓毎に異なった湯温では使用できない。Therefore, each faucet cannot be used with different water temperatures.

？）湯温設定部と、実際に湯全使用する場所、すなわち
水栓の位置とが離１しているので不便である。? ) It is inconvenient because the hot water temperature setting unit and the place where all the hot water is actually used, that is, the location of the faucet, are separated by one space.

発明の目的 本発明は、このような従来の問題点を解消するもので、
■使用する水栓を直接操作することによって湯温か設定
でき、■他の水栓における設定湯温の影響を受けること
なく、かつ■エネルギー十口失全最小限にする給湯シス
テム全実現すること全目的とする。Purpose of the Invention The present invention solves these conventional problems.
■Water temperature can be set by directly operating the faucet in use, ■It is not affected by the hot water temperature settings of other faucets, and ■It is possible to realize a complete hot water supply system that minimizes energy loss. purpose.

発明の構成 この目的全達成するために、本発明は、設定した湯温値
全外部に出力しつる複数個の混合水栓とガス比例制御弁
付の瞬間給湯機とによって構成し、上記各混合水栓で設
定した湯温の最大値を補償した値が上記瞬間給湯機の出
湯温度になるように燃焼量を制御する。Structure of the Invention In order to achieve all of the above objects, the present invention comprises a plurality of mixing faucets that output all set hot water temperature values externally, and an instantaneous water heater equipped with a gas proportional control valve. The amount of combustion is controlled so that the hot water temperature of the instantaneous hot water heater is a value obtained by compensating for the maximum value of the hot water temperature set at the faucet.

実施例の説明 第２図において、１３および１４ば、設定値が外部に出
力できる湯温設定部を備え、かつ出湯温度が、前記設定
値になるように、瞬間給湯機１がら供給さ几る湯と、水
管２６から供給される水を自動的に混合する機能金儲え
た混合水栓である。DESCRIPTION OF THE EMBODIMENTS In FIG. 2, 13 and 14 are provided with a hot water temperature setting unit capable of outputting a set value to the outside, and are supplied from the instant hot water heater 1 so that the hot water temperature reaches the set value. This is a mixing faucet with a feature that automatically mixes hot water and water supplied from the water pipe 26.

７ａは、瞬間給湯＠１の湯温制御回路であり、第１図の
湯温設定部８にょる湯温設定イに号の代りに各混合水栓
１３、および１４の湯温設定信号ＴＩオよびＴ２が、設
定値として入力さ几ている。7a is a hot water temperature control circuit for instantaneous hot water supply @1, and instead of the hot water temperature setting part 8 in FIG. and T2 are input as set values.

ΔＴは湯温設定信号を補償するための信号であり、補償
用信号として入力される。ΔT is a signal for compensating the hot water temperature setting signal, and is input as a compensation signal.

なお、第１図と同一の構成要素には、同一の番号を付し
ている。Note that the same components as in FIG. 1 are given the same numbers.

上記構成において温度制御回路７ａは上記湯温設定信号
Ｔ１．　Ｔ２１，１比較してＴ１≧Ｔ２ならばＴ１に、
才たＴ１＜Ｔ２ならばＴ２に対して、補償用信号ΔＴに
よって補償した値を、基準湯温設定値とする。In the above configuration, the temperature control circuit 7a receives the hot water temperature setting signal T1. Compare T21,1 and if T1≧T2, then T1,
If T1<T2, the value compensated for T2 by the compensation signal ΔT is set as the standard hot water temperature setting value.

一方、瞬間給湯機１の出湯温度は、出［ｊ付近２に配置
さｎた湯温検知器６によって検知され、実際の湯温信号
が、被制御信号Ｔｃとして、温度制御回路７ａに入力さ
れている。温度制御回路７ａは、」二記基準湯温設定値
と、被制御信号Ｔｃと在校しつつ、両者が等しくなるよ
うにガス比例制御弁全制御することによって、ガス流量
を制御し、その結果、バーナ４の燃焼量を制御する。On the other hand, the outlet temperature of the instant hot water heater 1 is detected by the hot water temperature detector 6 placed near the outlet 2, and the actual hot water temperature signal is input to the temperature control circuit 7a as the controlled signal Tc. ing. The temperature control circuit 7a controls the gas flow rate by fully controlling the gas proportional control valve so that the two reference hot water temperature set values and the controlled signal Tc are equal. , controls the combustion amount of the burner 4.

すなわち、瞬間給湯機の出湯温度は、各混合水栓で設定
した湯温の最大値を補償した値に近プ°くように制御さ
れる。That is, the hot water temperature of the instant hot water heater is controlled so as to be close to a value obtained by compensating for the maximum value of the hot water temperature set at each mixing faucet.

第３図は第２図における設定した湯温値が外部に出力可
能な混合水栓１３、および１４において、温度設定部分
の構造の一例を示す。第３図においで、１８は従来の出
湯温度制御が可能な混合水栓の本体部分、１９は設定温
度目盛、２０は温度設定用のツマミ、２１ｉｄポテンシ
ヨメータであり、そのｉｉ］動軸２３ば、混合水栓本体
１８の温度設定用の可動４１１１１１８＆と連動する。FIG. 3 shows an example of the structure of the temperature setting portion in the mixing faucets 13 and 14 shown in FIG. 2, which can output the set hot water temperature value to the outside. In FIG. 3, 18 is the main body of a conventional mixing faucet that can control the hot water temperature, 19 is a setting temperature scale, 20 is a temperature setting knob, 21 is an id potentiometer, and ii] moving shaft 23 For example, it is linked with the movable member 4111118& for temperature setting of the mixing faucet main body 18.

２２　ｉｊポテンショメータ２１の本体全混合水栓の本
体部分（同定部分）＋／Ｃ固定するための金具である。22 ij This is a metal fitting for fixing the main body part (identification part) +/C of the potentiometer 21 of the total mixing faucet.

温度設定用のツマミ２０ｉ、ポテンショメータ２１の可
動軸２３と取付ネジ２４によって固定する。このような
構成によって、温度設定用のツマミ２０を廻して、湯温
全目盛に合せると、温度設定用のツマミ２０と連動して
ポテンショメーク２１の可動軸２３も回転し、湯温目盛
に対応した位置信号が得られる。It is fixed by the temperature setting knob 20i, the movable shaft 23 of the potentiometer 21, and the mounting screw 24. With this configuration, when the temperature setting knob 20 is turned to match the full hot water temperature scale, the movable shaft 23 of the potentiometer 21 also rotates in conjunction with the temperature setting knob 20, and the position corresponding to the hot water temperature scale is adjusted. I get a signal.

第４図は、温度制御回路７ａと周辺回路構成の一例を示
す。第４図において温度制御回路７ａは１チツプ・マイ
クロコンビコーク１５と４ビツトＤＡ変換器１６、およ
びパワー増幅器１７によって構成する。１チツプ・マイ
クロコンピュータ１６は、ＡＤ変換回路内蔵のＬＳＩｆ
、使用することによって入力回路全簡略化できる。第５
図は、ＡＤ変換器全内蔵して直接アナログ信号全入力で
きる１チツプ・マイクロコンピュータ（Ｍ５８８４１−
ｘｘｘｓｐ）の構成図を示す。FIG. 4 shows an example of the configuration of the temperature control circuit 7a and peripheral circuits. In FIG. 4, the temperature control circuit 7a is composed of a 1-chip microcombicoke 15, a 4-bit DA converter 16, and a power amplifier 17. The 1-chip microcomputer 16 is an LSIf with a built-in AD conversion circuit.
By using , the input circuit can be completely simplified. Fifth
The figure shows a one-chip microcomputer (M58841-
xxxsp) is shown.

Ｒｃは、基準湯温設定値全補償するためのポテンショメ
ータであり、ＶｓとＲｃの分割比で定する％ｒ　位差が
、マイクロコンビ一−り１５のアナ「１グ入力端子に５
１ｆこ入力される。Rc is a potentiometer for fully compensating the standard hot water temperature set value, and the %r level difference determined by the division ratio of Vs and Rc is the same as the 5-pin input terminal of the microcombi series 15.
1f is input.

なお、Ｒｃは外部から調整可能″Ｔ′ある。Note that Rc can be adjusted from the outside by ``T''.

第４図において、混合水栓１３、および１４で設定した
湯温値Ｔ１およびＴ２は上記で説明し７た原理にもとづ
き、ポテンショメータの電位変化としてマイクロコンピ
ュータ１６のアナログ入力端子ＫＯおよびに１に入力さ
れる。被制御信号Ｔｃは、ザーミスタのような湯温検知
器６と直列抵抗６ａとで分割ｔ、７ζ電位変化として、
同様にマイクＤ　：Ｊンピ、−り１５のアナログ入力端
子に２に入力さ几る。In FIG. 4, the hot water temperature values T1 and T2 set at the mixing faucets 13 and 14 are input to the analog input terminals KO and 1 of the microcomputer 16 as changes in the potential of the potentiometer, based on the principle explained above and explained in section 7. be done. The controlled signal Tc is divided by a hot water temperature sensor 6 such as a thermistor and a series resistor 6a as a potential change t, 7ζ.
Similarly, microphone D: is input to the analog input terminal of 15.

マイクロコンピュータ４６は、設定値Ｔ１およびＴ２の
最大値をΔＴによって補償した値、例えばＴｌ＋にΔＴ
（Ｋ　：定数＋　Ｔ＋　＞　Ｔ２）と、被制御信号ＴＯ
を比較しつつ、４ビットの制御信号をＤＯ〜Ｄ３の出力
端−子から出力する。The microcomputer 46 sets a value obtained by compensating the maximum value of the set values T1 and T2 by ΔT, for example, ΔT to Tl+.
(K: constant + T+ > T2) and the controlled signal TO
While comparing the values, a 4-bit control signal is output from the output terminals of DO to D3.

上記制御信号乞ｊ：ＤＡ変換器１６によってアナログ信
号に変俟さｎ、パワー増幅器１７を経て、ガス比例制御
弁５奮制御する。このような制御手順は、マイクロコン
ピュータ１５に内蔵さ１１ているプログラムメモリ　（
ＲＯＭ・　２０４８語×９ビット）に記載さ几ている。The above control signal is converted into an analog signal by the DA converter 16 and then passed through the power amplifier 17 to control the gas proportional control valve 5. Such control procedures are carried out in the program memory (11) built into the microcomputer (15).
It is written in ROM (2048 words x 9 bits).

第６図は、−Ｆ記制御手順全フローチャートで説明して
いる。FIG. 6 is a flowchart of the entire control procedure described in -F.

以上のような構成と動作は、混合水栓の数が増加したシ
ステノ・においても同様の考え方でシステムを構成する
ことができる。The above configuration and operation can be used to configure a system using the same concept even in a system where the number of mixing faucets has increased.

発明の効果 以」〕のように本発明の瞬間給湯ソステノ・によ几ば、
次の効果が期待できる。According to the instant hot water heating system of the present invention,
The following effects can be expected.

（１）各混合水栓は、それ自身が自動的に湯温全制御す
る機能ケ備えているので、各混合水栓毎に独自の湯温設
定が可能である。(1) Since each mixer faucet has the function of automatically controlling the water temperature, each mixer faucet can set its own hot water temperature.

？）」二記混合水栓の各湯温設定値を、瞬間給湯機にフ
ィードバックし、瞬間給湯機の温度制御回路は、−Ｆ記
者湯温設定値の最大値が、瞬間給湯機の出湯温度になる
ように制御するので、必要以上に湯温全高める必要がな
い。このために、配管中の放熱損失を軽減する効果があ
る。? )" Each hot water temperature setting value of the mixer tap is fed back to the instantaneous hot water heater, and the temperature control circuit of the instantaneous hot water heater determines that the maximum value of the -F reporter hot water temperature setting value is equal to the hot water output temperature of the instantaneous hot water heater. There is no need to raise the water temperature more than necessary. This has the effect of reducing heat radiation loss in the piping.

（３配管による湯温降下分を外部操作によって任意に補
償できるので、配管長の変化による水栓口における湯温
低下が軽減できる。(Since the drop in hot water temperature due to the three pipes can be compensated for arbitrarily by external operation, the drop in hot water temperature at the faucet opening due to changes in pipe length can be reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図に、従来の瞬間給湯システムの原理図、第２（′
Ａは、本発明による瞬間給湯システムの構成図、第３図
は、混合水栓の湯温設定部の一部構成図、第４図は、温
度制御回路の一構成例を示す図、第５図は温度制御回路
に使用するマイクロコンピュータの内部構成図、第６図
は制御手順のフローチャー１・である。 １・・・・・・給湯機本体、５・・・・・・ガス比例制
御弁、６・・・・・・湯温検知器、７１Ｌ・・・・・・
温度制御回路、１３゜１４＝−・−混合水栓、２’１＋
　２１　ａ、　２１　ｂ、　　Ｒｃ・・・・・・ポテン
ショメータ、１５・・・・・・マイクロジンピユータ、
ΔＴ・・・・・・補償用信号。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名２２Figure 1 shows the principle diagram of a conventional instantaneous hot water supply system, and Figure 2 ('
A is a block diagram of an instantaneous hot water supply system according to the present invention, FIG. 3 is a partial block diagram of a water temperature setting section of a mixed faucet, FIG. 4 is a diagram showing an example of the configuration of a temperature control circuit, and FIG. The figure is an internal configuration diagram of a microcomputer used in the temperature control circuit, and FIG. 6 is a flowchart 1 of the control procedure. 1...Water heater body, 5...Gas proportional control valve, 6...Water temperature detector, 71L...
Temperature control circuit, 13°14=-・-mixing faucet, 2'1+
21 a, 21 b, Rc...Potentiometer, 15...Microjinpiyuta,
ΔT・・・Compensation signal. Name of agent: Patent attorney Toshio Nakao and 1 other person22

Claims (1)

【特許請求の範囲】 （１）複数の混合水栓を端末部を有し、」二記各混合水
栓の設定湯温の最大値を補償した温度が上記瞬間給湯機
の出湯温度になるように燃焼敏全制御する瞬間給湯シス
テム。 し）設定値が外部出力できる湯温設定部を備えかつ、出
湯温度が上記設定値になるべく自動的に湯と水を混合す
る機能を備えた堝′許請求の範囲第１項に記載の瞬間給
湯システム。 （３）複数の混合水栓で設定した各湯温信号と、外部か
ら調整力釦丁能な補償信号を人力信ぢ・とじ、上記各湯
温信号の最大値ヲ」二記補償信号で加下し／ζ値をもっ
て、基準設定湯温とするように構成した特許請求の範囲
第１項に記載の瞬間給湯システム。[Scope of Claims] (1) A plurality of mixing faucets each having an end portion, and (2) a temperature that compensates for the maximum value of the set hot water temperature of each of the mixing faucets so that the hot water temperature of the instantaneous hot water heater becomes the hot water temperature. An instant hot water supply system that fully controls combustion. (b) A water bath equipped with a hot water temperature setting unit capable of externally outputting a set value and having a function of automatically mixing hot water and water so that the hot water temperature reaches the above set value. Hot water system. (3) Manually combine each water temperature signal set for multiple mixing faucets and a compensation signal that can be adjusted from the outside using the adjustment force button, and add the maximum value of each water temperature signal above with the two compensation signals. The instantaneous hot water supply system according to claim 1, wherein the instantaneous hot water supply system is configured to set the reference hot water temperature based on the drop/ζ value.
JP57144525A 1982-08-19 1982-08-19 Tap-controlled hot water supply system Pending JPS5932739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57144525A JPS5932739A (en) 1982-08-19 1982-08-19 Tap-controlled hot water supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57144525A JPS5932739A (en) 1982-08-19 1982-08-19 Tap-controlled hot water supply system

Publications (1)

Publication Number Publication Date
JPS5932739A true JPS5932739A (en) 1984-02-22

Family

ID=15364352

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57144525A Pending JPS5932739A (en) 1982-08-19 1982-08-19 Tap-controlled hot water supply system

Country Status (1)

Country Link
JP (1) JPS5932739A (en)

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