| 摘要 |
<p>The heating system has a central storage unit, which can be heated, for a pumpable heat-transfer medium such as water. Heating circuits containing radiators each have a pump supplying them with a quantity of water dependent on temp. Each heating circuit with a pump forms a primary circuit working with a secondary circuit, which connects it to the storage unit and contains a further pump. The quantity delivered by the latter is likewise controlled dependent on temp. There can be a non-return valve, connected in series with each pump.</p> |
