| 摘要 |
<p>PURPOSE:To improve the safety by controlling the hot water temperature on the outlet side of the heat exchanger in a certain range close to the set temperature by controlling the selectible calorific value and the flow rate which is adjustable in a certain range. CONSTITUTION:The water which is adjusted in its flow rate by a flow rate adjusting means in the water circuit is supplied to and heated in the water heater 4. By comparing the hot water temperature on the outlet side of the heat exchanger with the set temperature, the flow rate in the water circuit is controlled so as to bring the hot water temperature to the set temperature. If the water flow rate in the water circuit becomes lower than the first set flow rate (minimum flow rate, for example), and the hot water temperature becomes lower than the set temperature by a certain degree in spite of the afore-said flow rate control, the heating capacity of the heating device 1 is increased. On the other hand, if the flow rate in the water circuit becomes higher than the second flow rate setting (maximum flow rate, for example) which is higher than the first flow rate setting, and the hot water temperature becomes higher than the set temperature by a certain degree, the heating capacity of the heating device 1 is reduced.</p> |
