US4886110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
HVAC zone control system
Assignee: Valera Electronics Inc
•
Filing: 1988-02-22
•
Granted: 1989-12-12
•
Expires: 2008-02-22
Abstract
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.
Inventors
- 👤 Ronald E. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:01
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1927; G05D23/193; G05D23/1932; G05D23/1934; F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/76; F24F3/00; F24F3/044
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
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, said unit being connected via ducts to each of said 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, said microprocessor having a plurality of output means connected to activating motors to move said dampers and a plurality of output means for activating said heating and cooling stages, said system including an automatic mode of operation in which the microprocessor activates said heating stages of said cooling stages and controls the number of stages of heating or cooling which are energized in dependence on the difference between the number of zones thermostats calling for heating and the number of zone thermostats calling for cooling equalling or exceeding a predetermined number.
Claim 2
Dependent Claim
157 words
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, said unit being connected via ducts to each of said 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, said microprocessor having a plurality of output means connected to activating motors to move said dampers and a plurality of output means for activating said heating and cooling stages, said system including an automatic mode of operation in which the microprocessor activates said heating stages of said cooling stages and controls the number of stages of heating or cooling which are energized in dependence on the difference between the number of zones thermostats calling for heating and the number of zone thermostats calling for cooling equalling or exceeding a predetermined number.
Claim 3
Dependent Claim
26 words
A system as claimed in claim 1 wherein the dampers for all zones are open unless at least one stage of heating or cooling is activated.
Claim 4
Dependent Claim
29 words
A system as claimed in claim 2 wherein, during heating, the dampers of the zone calling for heating are open while the dampers for all other zones are closed.
Claim 5
Dependent Claim
29 words
A system as claimed in claim 3 wherein, during cooling, the dampers of the zones calling for cooling are open while the dampers for all other zones are closed.
Claim 6
Dependent Claim
47 words
A system as claimed in claim 4 and further comprising a 7-day clock connected to said microprocessor for controlling operation of the system during an occupied mode in which operation of said blower is constant and an unoccupied mode in which operation of said blower is intermittent.
References Cited (Backward Citations)
CA746577A
Cited
CA902918A
Cited
US3171019A
Cited
US3116786A
Cited
US3243553A
Cited
US3297250A
Cited
US3306348A
Cited
US3482623A
Cited
US3677335A
Cited
US3724534A
Cited
US3785432A
Cited
US3814173A
Cited
US3838733A
Cited
CA1030247A
Cited
CA1037588A
Cited
US3933197A
Cited
US4013118A
Cited
US3934797A
Cited
US3949807A
Cited
US3979060A
Cited
US4009825A
Cited
US4355760A
Cited
US4205782A
Cited
CA1145012A
Cited
US4237966A
Cited
US4335848A
Cited
CA1164970A
Cited
US4328528A
Cited
CA1177935A
Cited
CA1167134A
Cited
US4530395A
Cited
CA1218438A
Cited
CA1213957A
Cited
CA1187966A
Cited
US4533080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |