| 摘要 |
The gas boiler is intended for room heating and producing hot water and has a gas-heated primary heat exchanger which feeds two heating circuits lying in parallel. The heat exchange medium is circulated via a rotary pump driven by an electric motor, arranged on the cold side of the primary heat exchanger and has a control mechanism which is arranged on the pressure side and controlled by speed or direction of rotation. This control mechanism serves to actuate a switch mechanism connected to the pump housing, in that it connects in series one or other heating circuit to the primary heat exchanger. The switch mechanism is arranged on the hot side of the primary heat exchanger in the pipework to the heating circuits.
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