Zone control apparatus for central heating and/or cooling systems
US4702412A · kind A · utility
Inventors
Key dates
| Filing date | Feb 24, 1987 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Feb 24, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86405
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.