| 摘要 |
The heating system has a pref. oil-fired boiler and a series-connected water boiler; or a parallel second heating source with water boiler and circulation pipes for the warm water, and to connect the two boilers. Two valves are located in the return pipe, at the branch-off to the first and second boiler. The valves are opened/closed by demand, on a time limit, or timer controlled. The valves are connected to a circulation pump, and the return contains a temperature feeler, which dependant upon the temperature, opens/closes the valves, and/or controls the pump.
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