| 摘要 |
PURPOSE:To obtain a comfortable heating effect by a method wherein the operating speed of a fan is reduced upon starting during the temperature of a heat exchanger is low and the operating speed of the fan is increased stepwisely to a set speed in accordance with the temperature rise of the heat exchanger. CONSTITUTION:In case a starting switch Ss is thrown after switching a wind speed setting switch Sc to a high-speed contact C, for example, and the temperature of the heat exchanger is lower than a temperature T1, the outputs of relational operators OP1-OP3 become H and the outputs of exclusive ''or'' become L. Accordingly, transistors Tr1-Tr3 are put OFF, the contacts 1Xs-3Xs of relays 1X-3X are all being put onto the terminal sides thereof and the fan FM is operated in a weak speed. Next, when the temperature of the heat exchanger is arrived at a temperature within T1-T2, only the OR1 outputs H outputs, the contact 1Xs is switched to the side of a (b) terminal through the transistor Tr1 and the fan FM is operated in a low speed. Thereafter, the operation of the fan FM is shifted into a high speed operation stepwisely by putting the transistors Tr2, Tr3 ON sequentially in accordance with the temperature rise in the same manner. |
