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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0472791 (1990-01-31) |
발명자 / 주소 |
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인용정보 | 피인용 횟수 : 6 인용 특허 : 11 |
An automatic control device for a hot water heating system, comprises a first relay being connectable to a water temperature switch such that the first relay is energized when the switch is closed and a second relay connected to the first relay such that the second relay is energized when the first
An automatic control device for a hydronic heating system for space heating and water heating, said device comprising: (a) a first relay means for connecting to a water temperature switch operably associated with a water heater such that said first relay means is energized and deenergized when the s
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