초록 ▼

An improved zone control apparatus having mode selectors which allow a user to select any one of a variety of operating modes for individual fluidically actuated flow control devices. The invention further provides for a smoke damper which upon automatic or manual activation causes all of the flow c

An improved zone control apparatus having mode selectors which allow a user to select any one of a variety of operating modes for individual fluidically actuated flow control devices. The invention further provides for a smoke damper which upon automatic or manual activation causes all of the flow control devices to restrict flow of conditioned fluid through respective ducts or pipes so as to help minimize smoke contamination and the formation of a “chimney”effect. The invention further provides for the utilization of vibration type diaphragm pumps to create a source of pressure and vacuum, a pressure test device to quickly check the pressure in the apparatus, and a flow indicator for determining the location of leaks in the apparatus.

대표청구항 ▼

In combination with a central heating and/or cooling system having a source of conditioned fluid controlled by a thermostat in one energizing circuit for the source of conditioned fluid and respective conduits for directing the conditioned fluid to respective zones for conditioning the environment t

In combination with a central heating and/or cooling system having a source of conditioned fluid controlled by a thermostat in one energizing circuit for the source of conditioned fluid and respective conduits for directing the conditioned fluid to respective zones for conditioning the environment thereof, a zone control apparatus comprising: a pressure source, a vacuum source, a pressure supply line connected to said pressure source, a vacuum supply line connected to said vacuum source, a cycle period supply line, cycle controller means for automatically alternately connecting said pressure source and vacuum source to said cycle period supply line at prescribed times, at least one fluidically actuated flow control means for controlling flow of conditioned fluid through a respective one of said conduits, said flow control means having inlet means for receiving pressure and vacuum for actuation alternately between high and low flow conditions, and selector switch means for selectively connecting said inlet means of said flow control means to any one of said pressure supply line, vacuum supply line, and cycle period supply line.