| 摘要 |
PURPOSE:To preheat a building, and to reduce heating load by controlling a blast device in response to temperature difference between a warm-air heat accumulating section and a warm-air blast section. CONSTITUTION:A sunroom 2 as the warm-air heat accumulating section and a room 4 are each provided with thermistors 12, 14, a temperature difference switch 7 is closed when temperature difference detected between the sunroom and the room reaches a fixed value or more, and warm air in the sunroom 2 is forwarded into the room 4 through a duct 3 connected to the discharge port 5 of a blower 1 by the blower 1. When temperature difference being detected is the fixed value or less, the temperature difference switch 7 is opened, and the blower 5 is stopped. |
