US3853174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual voltage speed control for forced air heat exchanger
Assignee: Ardco Inc
•
Filing: 1971-12-06
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Granted: 1974-12-10
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Expires: 1991-12-06
Abstract
Abstract A forced circulation air cooled refrigerant condensers and their controls and power supply which allow the condensers to operate at normal high fan speed during summer or high ambient conditions when maximum condensing capacity is required and which have provisions for the operation of the condenser fans at roughly half speed when the ambient is less than maximum, when maximum condensing capacity is not required. This change in fan speed is achieved without the use of a ''''two speed motor'''' by the expedient of connecting a lower than normal voltage power supply to the condenser motor leads or alternately by reconnecting dualvoltage motors operating at the lower name plate voltage for the higher name plate voltage.
Inventors
- 👤 D Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:09
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F25B49/027; F25B39/00; F25B39/04; F25B2600/00; F25B2600/11; F25B2600/111; F25B2600/112; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
97 words
A forced air heat exchanger, comprising a heat exchange element with input power supply conductor means, utilizing fans positioned to drive air over said element, said fans being driven by alternating current motors connected in parallel to the conductor means, which motors operate at high speed when connected to a high voltage power supply and low speed when connected to a low voltage power supply, the improvement comprising a control and switch means actuated by the control, where said switch means, when actuated, alternately connects the conductor means to the high and the low voltage power supplies.
Claim 2
Dependent Claim
97 words
A forced air heat exchanger, comprising a heat exchange element with input power supply conductor means, utilizing fans positioned to drive air over said element, said fans being driven by alternating current motors connected in parallel to the conductor means, which motors operate at high speed when connected to a high voltage power supply and low speed when connected to a low voltage power supply, the improvement comprising a control and switch means actuated by the control, where said switch means, when actuated, alternately connects the conductor means to the high and the low voltage power supplies.
Claim 3
Dependent Claim
97 words
A forced air heat exchanger, comprising a heat exchange element with input power supply conductor means, utilizing fans positioned to drive air over said element, said fans being driven by alternating current motors connected in parallel to the conductor means, which motors operate at high speed when connected to a high voltage power supply and low speed when connected to a low voltage power supply, the improvement comprising a control and switch means actuated by the control, where said switch means, when actuated, alternately connects the conductor means to the high and the low voltage power supplies.
Claim 4
Dependent Claim
97 words
A forced air heat exchanger, comprising a heat exchange element with input power supply conductor means, utilizing fans positioned to drive air over said element, said fans being driven by alternating current motors connected in parallel to the conductor means, which motors operate at high speed when connected to a high voltage power supply and low speed when connected to a low voltage power supply, the improvement comprising a control and switch means actuated by the control, where said switch means, when actuated, alternately connects the conductor means to the high and the low voltage power supplies.
Claim 5
Dependent Claim
12 words
An improvement as in claim 1 where the control is a thermostat.
Claim 6
Dependent Claim
12 words
An improvement as in claim 1 where the control is a timer.
Claim 7
Dependent Claim
12 words
An improvement as in claim 1 where the control is a photocell.
Claim 8
Dependent Claim
13 words
An improvement as in claim 1 where the control is a sound detector.
Claim 9
Dependent Claim
12 words
An improvement as in claim 6 where the control is a thermostat.
Claim 10
Dependent Claim
12 words
An improvement as in claim 6 where the control is a timer.
Claim 11
Dependent Claim
12 words
An improvement as in claim 6 where the control is a photocell.
Claim 12
Dependent Claim
13 words
An improvement as in claim 6 where the control is a sound detector.
Claim 13
Dependent Claim
142 words
A forced air heat exchanger having a heat exchange element, first conductor means, fans driven by alternating current motors connected in parallel to said first conductor means, said fans positioned to force air over the element, said motors being of the type which operate at higher speed when connected to higher voltage and at lower speed when connected to lower voltage; wherein the improvement comprises second conductor means for connection to a higher voltage power supply; third conductor means for connection to a lower voltage power supply, a control, and switch means actuated by the control, said switch means operatively connected to the first conductor means, the second conductor means and the third conductor means, where the switch means, upon actuation by the control, electrically connects the first conductor means alternately to the second conductor means and to the third conductor means.
Claim 14
Dependent Claim
142 words
A forced air heat exchanger having a heat exchange element, first conductor means, fans driven by alternating current motors connected in parallel to said first conductor means, said fans positioned to force air over the element, said motors being of the type which operate at higher speed when connected to higher voltage and at lower speed when connected to lower voltage; wherein the improvement comprises second conductor means for connection to a higher voltage power supply; third conductor means for connection to a lower voltage power supply, a control, and switch means actuated by the control, said switch means operatively connected to the first conductor means, the second conductor means and the third conductor means, where the switch means, upon actuation by the control, electrically connects the first conductor means alternately to the second conductor means and to the third conductor means.
Claim 15
Dependent Claim
14 words
An improved heat exchanger as in claim 11 where the control is a timer.
Claim 16
Dependent Claim
14 words
An improved heat exchanger as in claim 11 where the control is a photocell.
Claim 17
Dependent Claim
15 words
An improved heat exchanger as in claim 11 where the control is a sound detector.
Claim 18
Dependent Claim
14 words
An improved heat exchanger as in claim 11 where the control is a thermostat.
Claim 19
Dependent Claim
126 words
In a forced air heat exchanger having a heat exchange element, first conductor means, a fan positioned to move air over the element, an alternating current motor connected to said first conductor means driving the fan, which motor operates at higher speed when connected to a higher voltage supply and at lower speed when connected to a lower voltage supply, the improvement comprising second conductor means for connection to a lower voltage power supply, third conductor means for connection to a higher voltage power supply, a control and switch means operatively connected to the first, second and third conductor means, said switch means, when actuated by the control, connects electrically the first conductor means alternately to the second conductor means and to the third conductor means.
Claim 20
Dependent Claim
126 words
In a forced air heat exchanger having a heat exchange element, first conductor means, a fan positioned to move air over the element, an alternating current motor connected to said first conductor means driving the fan, which motor operates at higher speed when connected to a higher voltage supply and at lower speed when connected to a lower voltage supply, the improvement comprising second conductor means for connection to a lower voltage power supply, third conductor means for connection to a higher voltage power supply, a control and switch means operatively connected to the first, second and third conductor means, said switch means, when actuated by the control, connects electrically the first conductor means alternately to the second conductor means and to the third conductor means.
Claim 21
Dependent Claim
14 words
An improved heat exchanger as in claim 16 where the control is a thermostat.
Claim 22
Dependent Claim
14 words
An improved heat exchanger as in claim 16 where the control is a timer.
Claim 23
Dependent Claim
14 words
An improved heat exchanger as in claim 16 where the control is a photocell.
Claim 24
Dependent Claim
15 words
An improved heat exchanger as in claim 16 where the control is a sound detector.
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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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |