US4044823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling air-conditioning systems
Assignee: Robertshaw US Holding Corp
•
Filing: 1976-02-26
•
Granted: 1977-08-30
•
Expires: 1996-02-26
Abstract
Abstract An air conditioning system controlled for automatically heating and/or cooling a multiple zone building is disclosed wherein each zone includes a zone temperature responsive load transmitter. Each load transmitter produces an output command signal for controlling operation of damper units and heating and cooling equipment. The command signal configuration is modified to avoid operation of heating and cooling equipment throughout a relatively wide "no load" band of zone temperatures centered around the zone set point temperature. The command signal is highly responsive to sensed zone temperature changes beyond the no load band so that the zone temperature tends to be maintained in the no load band. An alternative system is disclosed in which no load bands occur at two distinct command signal values and operation of damper units is effected when the command signal value shifts between the no load band values.
Inventors
- 👤 Frederick S. Biesecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:50
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; F24F11/62; F24F11/70; F24F11/72; F24F11/74; F24F11/75; F24F11/80; F24F11/88; F24F3/00; F24F3/044; F24F3/048; F24F3/052; F24F3/0527; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1927; G05D23/193; G05D23/1932; G05D23/1934; G05D23/20; F24F11/0001; F24F2011/0006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
218 words
In an air conditioning system having zone heating equipment, zone cooling equipment and a control system for governing operation of the heating and cooling equipment in response to electric analog zone temperature condition responsive signals from a zone sensor, the improvement comprising: a signal amplifier having one input connected to the zone sensor and its output connected for controlling the heating and cooling equipment, said signal amplifier producing a command signal whose values vary in accordance with changes in sensed zone temperature conditions above and below a no load band of zone temperatures; a command signal modifier means comprising a suppressor amplifier having one input connected to the signal amplifier output and its output connected to said one signal amplifier input; and a reference voltage source connected to the other inputs of said signal amplifier and said suppressor amplifier; said suppressor amplifier rendered effective by a predetermined command signal value indicative of a sensed zone temperature in said no load band, said suppressor amplifier output, when effective, substantially preventing the signal amplifier output from varying from said predetermined command signal value in response to variations in sensed zone temperature within said no load band; said suppressor amplifier output ineffective to prevent command signal variations in response to variations in sensed zone temperatures outside of said no load band.
Claim 2
Dependent Claim
218 words
In an air conditioning system having zone heating equipment, zone cooling equipment and a control system for governing operation of the heating and cooling equipment in response to electric analog zone temperature condition responsive signals from a zone sensor, the improvement comprising: a signal amplifier having one input connected to the zone sensor and its output connected for controlling the heating and cooling equipment, said signal amplifier producing a command signal whose values vary in accordance with changes in sensed zone temperature conditions above and below a no load band of zone temperatures; a command signal modifier means comprising a suppressor amplifier having one input connected to the signal amplifier output and its output connected to said one signal amplifier input; and a reference voltage source connected to the other inputs of said signal amplifier and said suppressor amplifier; said suppressor amplifier rendered effective by a predetermined command signal value indicative of a sensed zone temperature in said no load band, said suppressor amplifier output, when effective, substantially preventing the signal amplifier output from varying from said predetermined command signal value in response to variations in sensed zone temperature within said no load band; said suppressor amplifier output ineffective to prevent command signal variations in response to variations in sensed zone temperatures outside of said no load band.
Claim 3
Dependent Claim
60 words
A system as claimed in claim 1 wherein said command signal modifier further includes bistable switching amplifier means having its output connected to said other suppressor amplifier input, said switching amplifier operable between first and second output states to shift the command signal values required to render said suppressor amplifier effective between first and second predetermined respective command signal levels.
Claim 4
Dependent Claim
74 words
A system as claimed in claim 2 wherein said switching amplifier means has an input connected to said signal amplifier output and is operated to one of its output states in response to command signals indicative of zone temperatures a predetermined level above said no load band, said switching amplifier means operated to its other output state in response to command signals indicative of zone temperatures a predetermind level below said no load band.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |