| 摘要 |
An air conditioning unit for supplying conditioned air from a central station into a space to be conditioned to cool the space. The unit includes a device to regulate the quantity of air discharged therefrom. A pressure responsive valve is connected to the device and to the supply duct to provide a control signal to the device, the magnitude of the control signal varying with changes in pressure of the conditioned air in the supply duct to the unit. The unit further includes a thermostat for further varying the control signal supplied to the device, the magnitude of the control signal being varied in accordance with changes of the temperature in the area being conditioned. A suitable control has a normally open port through which conditioned air passes from the supply duct to the pressure responsive valve, and a normally closed port communicating with the thermostat. The normally closed port is opened when the temperature of the conditioned air supplied from the central station exceeds a predetermined value to pass the relatively warm air through the port to the thermostat, the magnitude of the control signal thereafter passing from the pressure responsive valve to the air regulating device being determined solely by the pressure of the conditioned air in the supply duct. |
