| 摘要 |
<p>The closed circuit water boiler which incorporates a heat exchanger in a branch line of the closed circuit which heats a domestic water supply, includes a control unit which operates the burner, the pump, and valves included in the circuit, so that the water supply from the boiler is regulated, and has a temperature sensor on the discharge side of the boiler, and another one on the discharge side of the heat exchanger for the domestic supply, and a further one on the feed side of this heat exchanger. There is also a pressure switch across this cold water feed line. Thus the heater is regulated, taking in account also the cold water feed temperature.</p> |
