| 摘要 |
PURPOSE:To enable control of a hot water temperature to be performed in accordance with load without getting any electrical signal from a load side by a method wherein a temperature at a hot water going pipe and another temperature at a hot water returning pipe are detected, the flow rate of circulating hot water is detected to suppose a heating load in a room. CONSTITUTION:A flow rate sensor 11 may detect a flow rate circulating through a hot water pipe and judge the number of fan convectors 5 calculated and used by a control device 9' in reference to this signal. When a heating operation is started, a first sensor 8 may detect a going flow temperature so as to have a maximum temperature due to a high load in a room and the control device 9' may control combustion in a burner 4 to supply hot water. As a temperature in the room is increased, a returning temperature of a burner 4 is increased and a difference between the going hot water flow temperature and the returning hot water flow temperature becomes low. When a second sensor 10 detects a hot water returning flow temperature and a difference between the going hot water flow temperature and the returning hot water flow temperature is less than a certain value, the control device 9' may control a combustion burner 4 and decreases the going hot water flow temperature. In turn, if the load is higher as compared wit the returning hot water flow temperature, a difference between the going hot water flow temperature and the returning hot water flow temperature is increased, so that it may control it in such a way as the returning hot water flow temperature is increased.
|
