HVAC zone control system
US4886110A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1988 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Feb 22, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F11/76
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An HVAC system for a plurality of zones comprising an air handling unit including a blower, a plurality of heating stages and a plurality of cooling stages. The air handling unit is connected via ducts to each of the zones, each zone having an air outlet provided with a two-position damper which is either open or closed and a thermostat for providing an input signal to a microprocessor. The microprocessor has outputs for activating motors to move the dampers and outputs for activating the heating and cooling stages. The system includes an automatic mode of operation in which the microprocessor controls the number of stages of heating or cooling which are energized in dependence on the difference between the number of zone therostats calling for heating and the number of zone thermostats calling for cooling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.