| 摘要 |
<p>The control circuit is for a solar heat collector with outward and return flow connections, the former leading via a pump to a heat exchanger or other user unit. The pump is started up whenever a temp. difference above a set value is indicated by detectors at the collector outlet and the heat exchanger, or by an impulse timer. The timer connects the pump to the power supply at adjustable intervals, to allow measurements to be carried out. It can incorporate first and second desired-value emitters for the intervals between the impulses and for their duration respectively. The timer setting device can be connected in parallel to that of the temp. differential control unit, in the electric supply to the pump motor.</p> |
