| 摘要 |
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 relay is energized. The first relay is connectable to an electrically operated valve controlling the flow of high temperature water from a boiler to a heat exchanger operably associated with a water heater such that the electrically operated valve is opened when the first relay is energized and closed when the first relay is de-energized. The first relay is connectable to the boiler such that the boiler is turned on when the first relay is energized. The second relay is connectable to a plurality of zone valves controlling the flow of high temperature water from the boiler to a plurality of space heaters such that the plurality of zone valves are turned off when the second relay is energized, thereby diverting a substantial portion of the output of the boiler to the water heater when the water temperature switch is closed.
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