JPS58130942A - Control device for hot-water reserving type electric water heater - Google Patents

Control device for hot-water reserving type electric water heater

Info

Publication number
JPS58130942A
JPS58130942A JP57012624A JP1262482A JPS58130942A JP S58130942 A JPS58130942 A JP S58130942A JP 57012624 A JP57012624 A JP 57012624A JP 1262482 A JP1262482 A JP 1262482A JP S58130942 A JPS58130942 A JP S58130942A
Authority
JP
Japan
Prior art keywords
water
hot water
hot
heat
temperature
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.)
Granted
Application number
JP57012624A
Other languages
Japanese (ja)
Other versions
JPH0320659B2 (en
Inventor
Hideji Kubota
窪田 秀治
Kazuo Hara
原 和夫
Yoshikazu Ito
美和 伊藤
Tadashi Usami
宇佐見 忠
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP57012624A priority Critical patent/JPS58130942A/en
Publication of JPS58130942A publication Critical patent/JPS58130942A/en
Publication of JPH0320659B2 publication Critical patent/JPH0320659B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1919Control of temperature characterised by the use of electric means characterised by the type of controller
    • G05D23/1923Control of temperature characterised by the use of electric means characterised by the type of controller using thermal energy, the cost of which varies in function of time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

PURPOSE:To reduce heat dissipating loss and improve power transmission efficiency by a method wherein the necessary conducting time of electric power supplied to a heating body is operated by detecting feed water temperature and the amount of heat of the hot-water remaining in a hot-water reserving tank and the necessary conducting time is contrived so as to be completed at a time when the conduction of midnight electric power is finished. CONSTITUTION:The temperature of water fed into the hot-water reserving tank is detected by a feed water temperature sensor 6 while the amount of heat to be reserved is operated in an operator 7 from the detected value of the sensor 6 and the capacity of the hot-water reserving tank. The amount of heat of the hot-water remaining in the hot-water reserving tank is detected by the detecting unit 8 for the amount of heat of the remaining hot-water while the necessary conducting time is operated in the operator 9 from a difference between the amounts of heat detected by the operator 7 and the unit 8. The conduction of electric power supplied to the heating body 2 is controlled in a timer unit 10 so that the necessary conducting time, obtained by the operator 9, has been completed at the time when the supply of the midnight electric power is finished. The high-temperature hot-water, raised in the temperature thereof, will not be left for a long period of time and the heat dissipating loss may be reduced. Further, the electric power is supplied in the later half of the time band for supplying the midnight electric power, therefore, the power transmission efficiency may be improved.

Description

【発明の詳細な説明】 本発明は深夜電力を利用する貯湯式電気温水器に関し、
給水水温と残湯熱量を把握して通電時間を算出するとと
もに、深夜電力の通電時間終了時刻と同時に前記通電時
間が消化されるようその通電を制御することにより沸上
げ後における熱ロスの少ない省エネルギー化機器の提供
を目的としている。
[Detailed Description of the Invention] The present invention relates to a hot water storage type electric water heater that uses late-night electricity.
Energy saving with less heat loss after boiling by calculating the energization time by understanding the water supply water temperature and residual water heat value, and controlling the energization so that the energization time ends at the same time as the end of the late-night electricity energization time. The aim is to provide equipment for

第1図は一般的な貯湯式電気温水器の断面図で、第2図
は従来の深夜電力を利用した貯湯式電気温水器の主要電
源回路図を示す0図において、1は貯湯タンク、2は発
熱体、3はサーモスタット、4は電源、5は深夜電力用
のタイムスイッチで、通電時間帯は一般には23時から
翌朝の7時までの8時間である0発熱体2は深夜電力の
通電時間内に冬期の水温に相当する8℃前後の水を約8
5℃に沸上げるようその発熱体容量が予め設定されでい
る。サーモスタット3は常閉の接点を有し、貯湯タンク
1内の湯温が約85℃になると接点を開成する。
Figure 1 is a cross-sectional view of a general hot water storage type electric water heater, and Figure 2 is a main power supply circuit diagram of a conventional hot water storage type electric water heater that uses late-night electricity. 3 is a heating element, 3 is a thermostat, 4 is a power supply, 5 is a time switch for late-night power, and the power-on period is generally 8 hours from 11:00 p.m. to 7:00 the next morning.0 Heating element 2 is a power-on for late-night power. Approximately 8 degrees of water with a temperature of around 8 degrees Celsius, which corresponds to the water temperature in winter, is
The capacity of the heating element is preset to raise the temperature to 5°C. The thermostat 3 has a normally closed contact, and opens the contact when the temperature of the hot water in the hot water storage tank 1 reaches approximately 85°C.

次に作用、動作を説明する。深夜電力の通電開始時刻t
こなるとタイムスイッチ5の接点が閉成して、発熱体2
への通電が開始される。貯湯タンク1内の湯温が約85
℃になるとサーモスタット3の接点が開成して発熱体2
への通電が停止される。
Next, the function and operation will be explained. Late-night electricity start time t
When this happens, the contacts of the time switch 5 close, and the heating element 2
energization starts. The water temperature in hot water storage tank 1 is approximately 85.
When the temperature reaches ℃, the contacts of the thermostat 3 open and the heating element 2
The power supply to is stopped.

このようにして毎朝貯湯量全部が約85℃に沸上かって
いる。
In this way, the entire amount of stored hot water is boiled to about 85°C every morning.

しかし、湯の使用量や給水水温は常に同じとは限らず、
日々、大きくは季節によって異なっている。特に入浴の
有無は湯の使用量を大きく左右する要素となっており、
入浴しない日は貯湯量の半分以上の湯を残すことにもな
る。又、季節的には給水水温の高低が採湯可能な適温湯
量に大きな影響を及ぼしており、給水水温の高い夏期は
冬期に比し適温溝が多量に採湯できる。しかし湯の使用
量は年間はぼ一定か、むしろ夏期の方が低温湯で使用す
るため、実質的な使用量が低下するのが一般的であり、
夏期の残湯が多くなる。
However, the amount of hot water used and the water supply temperature are not always the same.
It varies from day to day and largely from season to season. In particular, whether or not a person takes a bath is a factor that greatly influences the amount of hot water used.
On days when you don't take a bath, you end up with more than half of the stored hot water. Additionally, depending on the season, the temperature of the water supply has a large effect on the amount of suitable hot water that can be drawn, and in the summer when the water supply water temperature is high, a large amount of hot water can be drawn from the suitable temperature gutter compared to the winter. However, the amount of hot water used is generally constant throughout the year; in fact, the actual amount used is generally lower in the summer because hot water is used at a lower temperature.
There is a lot of leftover hot water in the summer.

従って残湯がある場合には短時間で沸上がってしまう、
しかしながら、従来においては深夜電力の通電時刻にな
ると一斉に発熱体2への通電が開始される。このため、
通電開始直後には電力負荷の集中が起こり、深夜電力の
本来の目的である電力負荷の均一化が図れず、送電効率
も悪い結果を招くとともに、貯湯タンク内に沸上げられ
た高温を使用に供さないで放置する時間が長くなり、自
然放熱による熱ロスが大きくなるという欠点を有してい
た。
Therefore, if there is residual water, it will boil in a short time.
However, conventionally, when the late-night power supply time comes, power supply to the heating elements 2 is started all at once. For this reason,
Immediately after power is turned on, the power load is concentrated, making it impossible to equalize the power load, which is the original purpose of late-night power, and resulting in poor power transmission efficiency. This has the drawback that the time it takes to stand without being used increases, and heat loss due to natural heat radiation increases.

又、従来の貯湯式電気温水器には残湯熱量を検出する装
置は装備されでおらず、残湯量を検出するものが一部で
やられできただけであった。この残湯量検出についても
貯湯タンクの外壁面にサーモスタットやサーミスターな
どの温度センサーを複数個差べて、その位置での温度変
化を検出する段階的な測定であった。このため残湯量を
次回の沸上げのデータとして活用することはなされてい
なかった。
Furthermore, conventional hot water storage type electric water heaters are not equipped with a device for detecting the amount of heat of remaining hot water, and only some of them are capable of detecting the amount of remaining hot water. Detecting the amount of remaining hot water was also a step-by-step process in which multiple temperature sensors, such as thermostats and thermistors, were placed on the outer wall of the hot water storage tank to detect temperature changes at those locations. For this reason, the amount of remaining hot water has not been used as data for the next boiling.

本発明はこれらの欠点を解消しようとするもので、給水
水温と貯湯タンク内の残湯熱量を検出して発熱体への所
要通電時間を算出するとともに、深夜電力の通電終了時
刻に前記所要通電時間が消化し得るよもその通電時間帯
を制御しようとするものである。
The present invention aims to eliminate these drawbacks, and calculates the required energization time to the heating element by detecting the water supply temperature and the amount of heat remaining in the hot water storage tank, and also calculates the required energization time at the end of the late-night power supply. The aim is to control the period of energization in a timely manner.

以下、本発明を第3図に示すブロック図に基づいて説明
する。第3図において、61よ貯湯タンク1内への給水
水温を検出するための給水水温センサー、7は前記給水
水温センサーで検出した検出値と貯湯タンク1のタンク
容量とから貯えておくべ塾熱量を算出する演算器Aであ
る。8は貯湯タンク1内の残湯熱量を検出する残湯熱量
検出装置、9は前記演算器A7と残湯熱量検出装置8で
検出したそれぞれの熱量の差から所要通電時間を算出す
る演算器B、10は深夜電力の通電終了時刻に前記演算
器B9で算出した所要通電時間が消化し得るよう発熱体
2への通電時間帯を制御するタイマー装置である。
The present invention will be explained below based on the block diagram shown in FIG. In FIG. 3, 61 is a water supply temperature sensor for detecting the temperature of the water supplied to the hot water storage tank 1, and 7 is a water supply temperature sensor that is stored based on the detected value detected by the water supply temperature sensor and the tank capacity of the hot water storage tank 1. This is a computing unit A that calculates . Reference numeral 8 denotes a residual water heat quantity detection device that detects the residual water heat quantity in the hot water storage tank 1, and 9 a computing unit B that calculates the required energization time from the difference between the respective heat quantities detected by the arithmetic unit A7 and the residual water heat quantity detection device 8. , 10 is a timer device that controls the period of time during which the heating element 2 is energized so that the required energization time calculated by the arithmetic unit B9 can be completed at the time when the late-night power supply ends.

次にその動作例を記号算式で詳細に説明する。Next, an example of its operation will be explained in detail using a symbolic formula.

貯湯タンク1のタンク容量をV(1)(湯温T ’C)
、深夜電力への通電時間帯突入直後の給水水温センサー
6の検出値をt(”C)とすると、まず演算器A7は 
K=(T−t)xV  の演)EH?い、深夜電力の通
電時間終了時刻までに貯湯タンク1内に貯えておくべき
熱量に、 (Kcal)を算出する。又、残湯熱量検出
装置8は例えば後述するような方法で、残湯として残さ
れでいる熱量Kz (Kcal)を検出する。
The tank capacity of hot water storage tank 1 is V(1) (hot water temperature T'C)
, if the detected value of the water supply water temperature sensor 6 immediately after entering the power-on time period for late-night power is t ("C), first, the computing unit A7
Performance of K=(T-t)xV) EH? (Kcal) is calculated as the amount of heat that should be stored in the hot water storage tank 1 by the end of the late-night power supply time. Further, the residual hot water heat quantity detection device 8 detects the calorific value Kz (Kcal) remaining as the residual hot water, for example, by a method described later.

次に演算器B9はH= (K、−に、)÷860÷W 
の演算を行い、残湯熱量を除いた正味の印加すべき熱量
から所要通電時間H(hr)を算出するものである(I
KWH−860Kcal )、ここでWは発熱体2の消
費電力(KW)を表わす、そしてタイマー装置10は深
夜電力の通電終了時刻に前記演算器B9で求めた所要通
電時間H(hr)が得られるよう深夜電力の通電時間帯
途中から発熱体2への通電を開始するように制御するも
のである。
Next, arithmetic unit B9 calculates H= (K, -)÷860÷W
The required energization time H (hr) is calculated from the net amount of heat to be applied excluding the remaining heat amount (I
KWH-860Kcal), where W represents the power consumption (KW) of the heating element 2, and the timer device 10 obtains the required energization time H (hr) determined by the calculator B9 at the end time of the midnight power supply. Control is performed so that power supply to the heating element 2 is started in the middle of the late-night power supply period.

次に残湯熱量検出装置8による残湯熱量に2(Kcal
 )の検出方法の一例を第4図〜第6図を用いて説明す
る。
Next, the residual water heat quantity detected by the residual water heat quantity detection device 8 is calculated as 2 (Kcal).
) will be explained using FIGS. 4 to 6.

すなわち、第4図は本発明における残湯熱量検出装置の
一例を備えた貯湯式電気温水器の断面図で、第5図およ
び第6図はその検出時の貯湯タンク内部の温度分布図を
示すものである。
That is, FIG. 4 is a sectional view of a hot water storage type electric water heater equipped with an example of the residual water heat amount detection device according to the present invention, and FIGS. 5 and 6 show temperature distribution charts inside the hot water storage tank at the time of detection. It is something.

第4図において、1は貯湯タンク、11は貯湯タンク1
内の湯温を測定すべく貯湯タンク1の下部に設けられた
温度検出器、12は給水管、13は給湯管、14はこの
給湯管の先端部に設けられた蛇口である。15は循環ポ
ンプで、一端を貯湯タンク1下部に、他端を給湯管13
の途中に接続された連通管16の途中に設けられ、貯湯
タンク1下部の水を連通管16お上び給湯管13の一部
を介して貯湯タンク1の上部へ循環させる。
In Fig. 4, 1 is a hot water storage tank, 11 is a hot water storage tank 1
A temperature detector is provided at the bottom of the hot water storage tank 1 to measure the temperature of the hot water inside, 12 is a water supply pipe, 13 is a hot water pipe, and 14 is a faucet provided at the tip of this water supply pipe. 15 is a circulation pump, one end of which is connected to the lower part of the hot water storage tank 1, and the other end of which is connected to the hot water supply pipe 13.
It is provided in the middle of a communication pipe 16 connected to the middle of the hot water storage tank 1, and the water in the lower part of the hot water storage tank 1 is circulated to the upper part of the hot water storage tank 1 through the communication pipe 16 and a part of the hot water supply pipe 13.

以上の構成において残湯熱量の検出方法を第5図および
第6図により説明する。
A method of detecting the amount of heat of remaining hot water in the above configuration will be explained with reference to FIGS. 5 and 6.

第4図に示す如く、最初T1℃の湯が貯湯タンク1に満
たされているものと仮定する。
As shown in FIG. 4, it is assumed that the hot water storage tank 1 is initially filled with hot water at T1°C.

この状態で蛇口14を開いてV、[1]の湯を使用した
後の貯湯タンク1内部の温度分布を示したのが第5図で
ある。すなわち、貯湯タンク下部1aには使用した湯量
v+[f]分だけ給水管12から[”CI水が流入し、
貯湯タンク上部1bにはT1[”CIの湯がV2[f]
残っている。この状態において蛇口14を閉じたまま、
循環ポンプ15を運転すると貯湯タンク下部1bの水が
連通管16を通って貯湯タンク上部4bから流入し、貯
湯タンク上部1bの湯層をかき乱すため、次第に平均湯
温化する。
FIG. 5 shows the temperature distribution inside the hot water storage tank 1 after opening the faucet 14 and using hot water V, [1] in this state. In other words, CI water flows into the lower part 1a of the hot water storage tank from the water supply pipe 12 by the amount of hot water v+[f] used,
The hot water of T1[”CI is V2[f] in the upper part 1b of the hot water storage tank.
Remaining. In this state, with the faucet 14 closed,
When the circulation pump 15 is operated, water in the lower part 1b of the hot water storage tank flows through the communication pipe 16 from the upper part 4b of the hot water storage tank and disturbs the hot water layer in the upper part 1b of the hot water storage tank, so that the temperature of the hot water gradually becomes average.

このようにして平均湯温化した貯湯タンク1の温度分布
を示したのが第6図でにT、 [”CIの平均温度とな
る。
FIG. 6 shows the temperature distribution of the hot water storage tank 1 where the hot water temperature has been averaged in this way.

従って貯湯タンク1のタンク容量はV[il(固有値V
 = V r 十V x )であるから、貯湯タンク下
部1bに設けた温度検出器11による循環ポンプ15運
転前の測定温度はt [”C]、循環ポンプ15運転後
の測定温度はT2[”CIなので、残湯熱量に2 [K
cal ]は次の通り算出できる。
Therefore, the tank capacity of hot water storage tank 1 is V[il (eigenvalue V
= V r + V x ), the temperature measured by the temperature detector 11 installed at the lower part 1b of the hot water storage tank before the operation of the circulation pump 15 is t["C], and the temperature measured after the operation of the circulation pump 15 is T2[" Since it is CI, the heat value of the remaining water is 2 [K
cal ] can be calculated as follows.

K2 =vx(T2  t )  [kcal ]以上
のように本発明によるものは、給水水温と残湯熱量を検
出することによって加熱すべき熱量を算出し、この熱量
からさらに発熱体への所要通電時間を算出し、この所要
通電時間を深夜電力の通電時間帯終了時刻に合わせて消
火するよう通電時間帯を制御するので、沸上げられた高
温湯の放置時間が短か(なり、貯湯タンクからの自然放
熱による熱ロスが減少して維持費が安くなると−1う効
果を有している。又、本発明によるものは深夜電力の通
電時間帯の後半分に通電されるので、前半に負荷が集中
する在来の深夜、電力利用機器に混在させて使用すると
通電時間帯前半の電力負荷のピークを緩和することとな
り、送電効率を向上できるという効果も有している。
K2 = vx (T2 t ) [kcal] As described above, in the present invention, the amount of heat to be heated is calculated by detecting the water supply temperature and the amount of heat of the remaining hot water, and from this amount of heat, the required energization time to the heating element is calculated. The system calculates the required energization time and controls the energization time period so that the fire is extinguished in line with the end of the late-night power energization period. This has the effect of reducing heat loss due to natural heat radiation and reducing maintenance costs.Also, since the system according to the present invention is energized in the latter half of the late-night power supply period, the load is reduced in the first half. When used in conjunction with devices that use electric power, which is traditionally the case late at night when electricity is concentrated, it will alleviate the peak power load during the first half of the power-on time period, and it will also have the effect of improving power transmission efficiency.

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

第1図は一般的な貯湯式電気温水器の断面図、第2図は
従来の貯湯式電気温水器の主要電源回路図、第3図は本
発明による通電制御プロ・ンク図、第4図は本発明での
残湯熱量検出装置の一例を備えた貯湯式電気温水器の断
面図、第5図および第6図は残湯熱量検出時における貯
湯タンク内の温度分布図を示す。 1は貯湯タンク、2は発熱体、6は給水水温センサー、
7は演算器A、8は残湯熱量検出装置、9は演算器B、
10はタイマー装置である。 代理人 葛 野 信 − 21 第4図 13 第51;、!      2′6【i
Fig. 1 is a cross-sectional view of a general hot water storage type electric water heater, Fig. 2 is a main power supply circuit diagram of a conventional hot water storage type electric water heater, Fig. 3 is an energization control program diagram according to the present invention, and Fig. 4 5 is a cross-sectional view of a hot water storage type electric water heater equipped with an example of the residual water heat amount detection device according to the present invention, and FIGS. 5 and 6 are temperature distribution charts in the hot water storage tank when detecting the residual water heat amount. 1 is a hot water storage tank, 2 is a heating element, 6 is a water supply water temperature sensor,
7 is a computing unit A, 8 is a residual water heat detection device, 9 is a computing unit B,
10 is a timer device. Agent Shin Kuzuno - 21 Figure 4 13 51st;,! 2′6 [i

Claims (1)

【特許請求の範囲】[Claims] 貯湯タンクへの給水水温を検出する給水水温センサーと
、この給水水温センサーで検出した検出値と貯湯タンク
のタンク容量とから貯えておくべき熱量を算出する演算
器Aと、貯湯タンク内の残湯熱量を検出する残湯熱量検
出装置と、前記演算器Aと残湯熱量検出装置で検出した
熱量の差から所要通電時間を算出する演算器Bと、深夜
電力の通電終了時刻に前記演算器Bで求めた所要通電時
間が得られるよう発熱体への通電を制御するタイマー装
置とを備えた貯湯式電気温水器の制御装置。
A water supply temperature sensor that detects the temperature of the water supplied to the hot water storage tank, a calculator A that calculates the amount of heat to be stored from the detected value detected by the water supply water temperature sensor and the tank capacity of the hot water storage tank, and a calculator A that calculates the amount of heat that should be stored from the detected value detected by the water supply water temperature sensor and the tank capacity of the hot water storage tank, and the remaining hot water in the hot water storage tank. a residual water heat quantity detection device that detects the heat quantity; a computing unit B that calculates the required energization time from the difference between the heat quantities detected by the computing unit A and the residual water heat quantity detection device; A control device for a hot water storage type electric water heater, comprising a timer device that controls energization to a heating element so as to obtain the required energization time determined by .
JP57012624A 1982-01-29 1982-01-29 Control device for hot-water reserving type electric water heater Granted JPS58130942A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57012624A JPS58130942A (en) 1982-01-29 1982-01-29 Control device for hot-water reserving type electric water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57012624A JPS58130942A (en) 1982-01-29 1982-01-29 Control device for hot-water reserving type electric water heater

Publications (2)

Publication Number Publication Date
JPS58130942A true JPS58130942A (en) 1983-08-04
JPH0320659B2 JPH0320659B2 (en) 1991-03-19

Family

ID=11810529

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57012624A Granted JPS58130942A (en) 1982-01-29 1982-01-29 Control device for hot-water reserving type electric water heater

Country Status (1)

Country Link
JP (1) JPS58130942A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60221629A (en) * 1984-04-18 1985-11-06 Misato Kk Controlling method of regenerative electric space heater
JPS6111558A (en) * 1984-06-27 1986-01-18 Matsushita Electric Ind Co Ltd Hot-water reserving type electric water heater
JPS6111557A (en) * 1984-06-27 1986-01-18 Matsushita Electric Ind Co Ltd Hot-water reserving type electric water heater
JPS6111555A (en) * 1984-06-27 1986-01-18 Matsushita Electric Ind Co Ltd Hot-water reserving type electric water heater
JPS6111552A (en) * 1984-06-27 1986-01-18 Matsushita Electric Ind Co Ltd Hot-water reserving type electric water heater
JPS62135052U (en) * 1986-02-20 1987-08-25

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6125062A (en) * 1984-07-13 1986-02-03 Nitsusui Seiyaku Kk Measurement of aso value by immunonephelometry

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6125062A (en) * 1984-07-13 1986-02-03 Nitsusui Seiyaku Kk Measurement of aso value by immunonephelometry

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60221629A (en) * 1984-04-18 1985-11-06 Misato Kk Controlling method of regenerative electric space heater
JPH0412370B2 (en) * 1984-04-18 1992-03-04 Misato Kk
JPS6111558A (en) * 1984-06-27 1986-01-18 Matsushita Electric Ind Co Ltd Hot-water reserving type electric water heater
JPS6111557A (en) * 1984-06-27 1986-01-18 Matsushita Electric Ind Co Ltd Hot-water reserving type electric water heater
JPS6111555A (en) * 1984-06-27 1986-01-18 Matsushita Electric Ind Co Ltd Hot-water reserving type electric water heater
JPS6111552A (en) * 1984-06-27 1986-01-18 Matsushita Electric Ind Co Ltd Hot-water reserving type electric water heater
JPH0327831B2 (en) * 1984-06-27 1991-04-17 Matsushita Electric Ind Co Ltd
JPH0328667B2 (en) * 1984-06-27 1991-04-19 Matsushita Electric Ind Co Ltd
JPH0328666B2 (en) * 1984-06-27 1991-04-19 Matsushita Electric Ind Co Ltd
JPS62135052U (en) * 1986-02-20 1987-08-25
JPH0422212Y2 (en) * 1986-02-20 1992-05-20

Also Published As

Publication number Publication date
JPH0320659B2 (en) 1991-03-19

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