| 摘要 |
<p>The heater is connected to the fluid-borne heating system of the building, the fluid from which circulates through it. On the outside of the valve arrangement is a damper which is operated by a temp.-sensitive component connected to the heater circulation circuit. The damper closes or at least limits input air supply if the temp. in the fluid circulating through the heater is below a predetermined value, or if the input air temp. is less than a specific value.</p> |
