| 摘要 |
PROBLEM TO BE SOLVED: To provide a bathroom heater, which can positively supply hot water at a minimum flow rate to an heat exchanger, even if there is variation in a valve-opening position in separate flow-control valves in use. SOLUTION: A circulation fan and a heat exchanger are accommodated in a main-body case. The fan circulates air in the bathroom. The heat exchanger is placed in the air circuit formed by the circulation fan in the bathroom. A flow-control valve 20 is placed in a hot-water-supply pipe for supplying hot water in circulation to the heat exchanger. The control valve 20 controls the supply flow-rate to the heat exchanger so as to hold bathroom temperature at a set temperature. Even after the bathroom temperature has reached a temperature for heating-suspension, the valve 20 is driven by a stepping motor 29 so as to supply hot water to the heat exchanger at a predetermined minimum flow rate. The valve 20 is driven forcibly to a step position corresponding to the predetermined minimum flow-rate in correspondence with flow-rate characteristics of the valve 20. Thus, the valve 20 maintains approximately an minimum flow-rate, even if there is variation in the valve travel in the vicinity of full close position. |
