| 摘要 |
PURPOSE:To enable to speedily detect a change in load and contrive to make uniform the operating periods of pumps, by a method wherein, when each unit is stopped, a circulating pump in the unit stopped last is operated, in a plurality of air conditioners connected in parallel with each other. CONSTITUTION:When an operating switch 15 is closed, whether an outlet temperature of a fan coil 9 is higher or lower than a predetermined temperature is detected by a detecting part 12 provided in a controller 4, and normally opened contacts 1401-1404 are sequentially closed through a controlling part 13. Accordingly, operating relays 500-800 for the first-fourth pumps 5-8 are sequentially energized to close normally opened contacts 501-801 thereof, and the pumps 5-8 are sequentailly operated. When the load is reduced under this condition, the pumps 8-6 are sequentially stopped. However, since normally closed contacts 602-802 of the relays 600-800 are closed, a self-sustaining circuit of the relay 500 for the first pump 5 is formed, and only the pump 5 is continuously operated. |
