Patent US4549601A successfully refreshed from Google Patents.
US4549601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable volume multizone system
Assignee: Carrier Corp
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Filing: 1983-12-19
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Granted: 1985-10-29
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Expires: 2003-12-19
Abstract
Abstract A zoned variable volume system is provided with a pair of non-connected dampers in each zone. The first damper controls flow through a cooling coil. The second damper controls flow through a heating coil and provides heated or neutral air depending upon whether or not the heating coil is actuated. The fan speed is adjusted to cause at least one damper to be fully open so that the system operates at a minimum static pressure.
Inventors
- 👤 Donald C. Wellman
- 👤 William E. Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:38
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044; F24F3/0442; F24F11/00; F24F11/30; F24F11/46; F24F11/70; F24F11/72; F24F11/74; F24F11/77; F24F11/80; F24F11/81; F24F11/83; F24F11/84; F24F11/88; F24F11/79; F24F2003/0446; F24F11/0001; F24F2011/0002; F24F2110/00; F24F2110/10; F24F2110/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
225 words
A method for operating a variable volume multizone system having a variable volume air supply and a plurality of zones with each of said plurality of zones having a first damper for controlling the flow of air into the zone from the variable volume air supply through a cooling coil, a second damper for controlling the flow of air into the zone from the variable volume air supply through a heating coil and means for heating the heating coil including the steps of: sensing the temperature in each zone; if the temperature in any zone is above a first adjustable set point for the zone, supplying air to the zone through the cooling coil only and adjusting the position of the first damper to regulate the flow to the zone; if the temperature in any zone is below a second adjustable set point for the zone, supplying air to the zone through the heating coil only, heating the heating coil and adjusting the position of the second damper to regulate the flow to the zone; and if the temperature in any zone is below said first adjustable set point and above said second adjustable set point supplying air to the zone through the unheated heating coil and adjusting the position of said second damper so as to maintain an adjustable minimum flow into the zone.
Claim 2
Independent Claim
225 words
A method for operating a variable volume multizone system having a variable volume air supply and a plurality of zones with each of said plurality of zones having a first damper for controlling the flow of air into the zone from the variable volume air supply through a cooling coil, a second damper for controlling the flow of air into the zone from the variable volume air supply through a heating coil and means for heating the heating coil including the steps of: sensing the temperature in each zone; if the temperature in any zone is above a first adjustable set point for the zone, supplying air to the zone through the cooling coil only and adjusting the position of the first damper to regulate the flow to the zone; if the temperature in any zone is below a second adjustable set point for the zone, supplying air to the zone through the heating coil only, heating the heating coil and adjusting the position of the second damper to regulate the flow to the zone; and if the temperature in any zone is below said first adjustable set point and above said second adjustable set point supplying air to the zone through the unheated heating coil and adjusting the position of said second damper so as to maintain an adjustable minimum flow into the zone.
Claim 3
Dependent Claim
34 words
The method of claim 1 further including the step of monitoring the position of each of the dampers and reducing the variable volume air supply if at least one damper is not fully open.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the step of monitoring the position of each of the dampers is done cyclically.
Claim 5
Dependent Claim
47 words
The method of claim 1 further including the step of cyclically monitoring the position of each of the dampers and zone demand and regulating the speed of the variable volume air supply so as to satisfy the demands of each zone at the lowest suitable fan power.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein the flow of air through the heating coil is at a constant volume when the heating coil is being heated.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein the flow of air through the heating coil is at a variable volume up to the maximum flow.
Claim 8
Dependent Claim
41 words
The method of claim 1 herewith including steps of: supplying outside air in amounts ranging from the minimum requirement for ventilation up to 100% with any deficiency make up with return air in response to the temperature of the outside air.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |