Patent US2739829A successfully refreshed from Google Patents.
Patent US3915376A successfully refreshed from Google Patents.
US3915376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning control system
Assignee: Robertshaw US Holding Corp
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Filing: 1974-02-01
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Granted: 1975-10-28
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Expires: 1994-02-01
Abstract
Abstract A multiple zone forced air type air conditioning system is disclosed in which the amount of atmospheric air admitted to the system is governed according to sensed temperature conditions of air being circulated through the warmest zone. An atmospheric air sensing control unit responds to atmospheric air temperature and moisture levels to minimize introduction of atmospheric air to the system, notwithstanding the temperature of air being circulated through the warmest zone, when atmospheric air temperature is within a predetermined temperature range but contains more than a predetermined amount of moisture, and when atmospheric air temperatures are higher than the temperature range. The control unit enables atmospheric air to be introduced into the system according to the air temperature being circulated through the warmest zone when the atmospheric air is within the temperature range and contains less than the predetermined moisture content as well as when the air temperature is below the temperature range regardless of moisture content.
Inventors
- 👤 Jr Russell G Attridge
- 👤 Andrew Kulick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:46
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044; F24F3/048; F24F3/052; F24F3/0527; F24F11/00; F24F11/30; F24F11/62; F24F11/70; F24F11/72; F24F11/74; F24F11/75; F24F11/80; F24F11/88
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
324 words
In a system for air conditioning a space: a. duct means communicating with the space and with ambient atmospheric air; b. air circulating means associated with said duct means for providing a forced flow of air in the system and through the space; c. ventilation means defining an atmospheric air intake opening, damper means actuable to variably control the flow rate of atmospheric air into the duct means via said intake opening, and a damper control unit for controllably actuating said damper means; d. first control means for governing operation of said damper control unit in response to sensed air conditions in said system; e. second control means for governing operation of said damper control unit in response to sensed atmospheric air moisture and temperature conditions, said second control means comprising atmospheric air moisture responsive means, atmospheric air temperature responsive means, and a control device operated by said moisture and temperature responsive means; i. said control device having a first condition preventing operation of said damper control unit by said first control means and a second condition enabling said first control means to govern operation of said damper control unit; ii. said temperature responsive means effecting operation of said control device to said first condition in response to sensed atmospheric air temperatures greater than a predetermined first temperature level, and effecting operation of said control device to said second condition in response to sensed atmospheric air temperatures less than a second predetermined temperature level lower than said first predetermined temperature level; iii. said moisture responsive means effecting operation of said control device to said first condition in response to detected atmospheric air moisture levels greater than a predetermined substantially constant moisture level when the atmospheric air temperature ranges between said first and second temperature levels, and to effect operation of said control device to said second condition in response to detected atmospheric air moisture levels less than said predetermined level in said temperature range.
Claim 2
Dependent Claim
324 words
In a system for air conditioning a space: a. duct means communicating with the space and with ambient atmospheric air; b. air circulating means associated with said duct means for providing a forced flow of air in the system and through the space; c. ventilation means defining an atmospheric air intake opening, damper means actuable to variably control the flow rate of atmospheric air into the duct means via said intake opening, and a damper control unit for controllably actuating said damper means; d. first control means for governing operation of said damper control unit in response to sensed air conditions in said system; e. second control means for governing operation of said damper control unit in response to sensed atmospheric air moisture and temperature conditions, said second control means comprising atmospheric air moisture responsive means, atmospheric air temperature responsive means, and a control device operated by said moisture and temperature responsive means; i. said control device having a first condition preventing operation of said damper control unit by said first control means and a second condition enabling said first control means to govern operation of said damper control unit; ii. said temperature responsive means effecting operation of said control device to said first condition in response to sensed atmospheric air temperatures greater than a predetermined first temperature level, and effecting operation of said control device to said second condition in response to sensed atmospheric air temperatures less than a second predetermined temperature level lower than said first predetermined temperature level; iii. said moisture responsive means effecting operation of said control device to said first condition in response to detected atmospheric air moisture levels greater than a predetermined substantially constant moisture level when the atmospheric air temperature ranges between said first and second temperature levels, and to effect operation of said control device to said second condition in response to detected atmospheric air moisture levels less than said predetermined level in said temperature range.
Claim 3
Dependent Claim
109 words
The system claimed in claim 1 wherein said first control means comprises signal circuitry for producing an analog electrical signal which varies progressively in response to sensed changes in system Air temperature levels, and further comprising a circuit connecting said signal circuitry to said damper control means and structure interconnecting said damper control unit to said damper means, said damper control unit effective to progressively actuate said damper means in response to changes in said signal, said control device comprising a switch in said circuit, said switch being open when said control device is in said first condition and closed when said control device is in said second condition.
Claim 4
Dependent Claim
54 words
The system claimed in claim 1 wherein said temperature responsive means comprises a thermostatic actuator, lever means supported for movement by said actuator and linkage means for effecting operation of said control device between said conditions in response to movement of said lever means beyond a predetermined range of movement by said thermostatic actuator.
Claim 5
Dependent Claim
122 words
The system claimed in claim 3 wherein said moisture responsive means comprises an elongated element which elongates and contracts in response to changes in relative humidity of air ambient said element, and operating member interconnecting a first location of said element with said control device whereby changes in effective length of said element are effective to change the condition of said control device, and support means interconnecting a second location of said element with said temperature responsive means, said temperature responsive means effective to move said support means in response to sensed air temperature changes to change the effective length of said element and compensate for changes in length of said element resulting from relative humidity changes caused by said temperature changes.
Claim 6
Independent Claim
180 words
A method of air conditioning a space comprising: a. circulating air in a system including the space; b. detecting temperature conditions of the circulating air; c. producing a control signal which varies according to sensed changes in system air temperature conditions; d. operating equipment for effecting heat exchange with the system air in response to the control signal; e. variably controlling the flowrate of atmospheric air introduced into said system in response to changes in the control signal level relative to a predetermined level; f. detecting atmospheric air temperature and moisture content levels; g. interrupting the control of the atmospheric air flow into the system by the control signal in response to detected atmospheric air temperature above a predetermined temperature and in response to detected atmospheric air moisture content above a predetermined substantially constant moisture level when atmospheric air temperatures range from said first predetermined temperature level to a second lower predetermined temperature level; and, h. minimizing the flow rate of atmospheric air into said system when control of the atmospheric air flow rate by the control signal is interrupted.
Claim 7
Independent Claim
180 words
A method of air conditioning a space comprising: a. circulating air in a system including the space; b. detecting temperature conditions of the circulating air; c. producing a control signal which varies according to sensed changes in system air temperature conditions; d. operating equipment for effecting heat exchange with the system air in response to the control signal; e. variably controlling the flowrate of atmospheric air introduced into said system in response to changes in the control signal level relative to a predetermined level; f. detecting atmospheric air temperature and moisture content levels; g. interrupting the control of the atmospheric air flow into the system by the control signal in response to detected atmospheric air temperature above a predetermined temperature and in response to detected atmospheric air moisture content above a predetermined substantially constant moisture level when atmospheric air temperatures range from said first predetermined temperature level to a second lower predetermined temperature level; and, h. minimizing the flow rate of atmospheric air into said system when control of the atmospheric air flow rate by the control signal is interrupted.
Claim 8
Dependent Claim
114 words
The method claimed in claim 5 wherein detecting atmospheric air moisture content and temperature levels comprises providing an element which elongates and contracts in response to sensed changes in relative humidity of ambient air, supporting said element for movement in response to detected ambient air temperature changes, moving the element in response to air temperature changes to compensate for changes in length of the element caused by relative humidity changes due to said air temperature changes, and wherein interrupting control of the atmospheric air flow into the system by the control signal includes changing the length of said element in response to changes in relative humidity caused by changes in the air moisture content.
Claim 9
Dependent Claim
35 words
The method claimed in claim 6 further including preventing interruption of the control of the atmospheric air flow into the system by said element regardless of relative humidity at temperatures below said second predetermined temperature.
Claim 10
Dependent Claim
274 words
In a system for air conditioning a space: a. duct means communicating with the sPace and with ambient atmospheric air; b. air circulating means associated with said duct means for providing a forced flow of air in the system and through the space; c. ventilation means defining an atmospheric air intake opening, damper means actuable to variably control the flow rate of atmospheric air into the duct means via said intake opening, and a damper control unit for controllably actuating said damper means; d. first control means for governing operation of said damper control unit in response to sensed air conditions in said system; e. second control means having a first condition preventing operation of said damper control unit by said first control means and a second condition enabling said first control means to govern operation of said damper control unit; i. temperature responsive means for effecting operation of said second control means to said first condition in response to sensed air temperatures greater than a predetermined first temperature level, and effecting operation of said second control means to said second condition in response to sensed air temperatures less than a second predetermined temperature level lower than said first predetermined temperature level; and, ii. moisture responsive means effecting operation of said second control means to said first condition in response to detected air moisture levels greater than a predetermined substantially constant moisture level when the air temperature ranges between said first and second temperature levels, and to effect operation of said second control means to said second condition in response to detected air moisture levels less than said predetermined level in said temperature range.
Claim 11
Dependent Claim
274 words
In a system for air conditioning a space: a. duct means communicating with the sPace and with ambient atmospheric air; b. air circulating means associated with said duct means for providing a forced flow of air in the system and through the space; c. ventilation means defining an atmospheric air intake opening, damper means actuable to variably control the flow rate of atmospheric air into the duct means via said intake opening, and a damper control unit for controllably actuating said damper means; d. first control means for governing operation of said damper control unit in response to sensed air conditions in said system; e. second control means having a first condition preventing operation of said damper control unit by said first control means and a second condition enabling said first control means to govern operation of said damper control unit; i. temperature responsive means for effecting operation of said second control means to said first condition in response to sensed air temperatures greater than a predetermined first temperature level, and effecting operation of said second control means to said second condition in response to sensed air temperatures less than a second predetermined temperature level lower than said first predetermined temperature level; and, ii. moisture responsive means effecting operation of said second control means to said first condition in response to detected air moisture levels greater than a predetermined substantially constant moisture level when the air temperature ranges between said first and second temperature levels, and to effect operation of said second control means to said second condition in response to detected air moisture levels less than said predetermined level in said temperature range.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |