Patent US3989097A successfully refreshed from Google Patents.
US3989097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehumidification controls
Assignee: MARSHALL ERDMAN AND ASSOC Inc
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Filing: 1974-09-27
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Granted: 1976-11-02
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Expires: 1994-09-27
Abstract
Abstract Automatic controls are added to the low voltage control wiring of a conventional heating and air conditioning system to provide for operation of the system to dehumidify when no heating or cooling is otherwise required. Control means are installed to maintain room temperature by alternate operating of conventional cooling and heating equipment. Circuit control means prevent operation of the dehumidification-cooling equipment when the system heating unit is in operation.
Inventors
- 👤 Walter T. Schildknecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:25
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F11/00; F24F11/89
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
298 words
An electrical control arrangement for use with a heating-air conditioning unit having air cooling means and air heating means to provide a dehumidification capability by utilizing the air cooling means to cool and dehumidify air and utilizing the air heating means to act as a reheater for the cooled-dehumidified air, the improvement comprising: said heating-air conditioning unit including means for moving the air and a heat exchanger for heating said air and also including an air cooling evaporator for selectively cooling said air and removing humidity in the form of moisture from said air; a control thermostat of the automatic switch-over type and including means for presetting a temperature for said air and including means coupled with both the air cooling means and the air heating means for automatic temperature control of said air as required by ambient conditions; humidity control means having a humidity sensing element and having an electrical switch means; means coupling said electrical switch means with the humidity control means for operating said switch means in response to humidity of said air; means, including relay control means, connecting said electrical switch for operation of said air cooling means in response to operation of said switch means by the humidity sensing means; said relay control means having a coil electrically coupled with said heating means for actuation when the heating means is heating the air; and, said relay control means having means for switching controlled by said coil and having normally closed contacts connected in series with said electrical switch means of the humidity responsive means whereby actuation of said coil when said heating of air is occuring opens said normally closed contacts to temporarily prevent operation of the air cooling means for dehumidification when the air heating means is operating and heating said air.
Claim 2
Dependent Claim
298 words
An electrical control arrangement for use with a heating-air conditioning unit having air cooling means and air heating means to provide a dehumidification capability by utilizing the air cooling means to cool and dehumidify air and utilizing the air heating means to act as a reheater for the cooled-dehumidified air, the improvement comprising: said heating-air conditioning unit including means for moving the air and a heat exchanger for heating said air and also including an air cooling evaporator for selectively cooling said air and removing humidity in the form of moisture from said air; a control thermostat of the automatic switch-over type and including means for presetting a temperature for said air and including means coupled with both the air cooling means and the air heating means for automatic temperature control of said air as required by ambient conditions; humidity control means having a humidity sensing element and having an electrical switch means; means coupling said electrical switch means with the humidity control means for operating said switch means in response to humidity of said air; means, including relay control means, connecting said electrical switch for operation of said air cooling means in response to operation of said switch means by the humidity sensing means; said relay control means having a coil electrically coupled with said heating means for actuation when the heating means is heating the air; and, said relay control means having means for switching controlled by said coil and having normally closed contacts connected in series with said electrical switch means of the humidity responsive means whereby actuation of said coil when said heating of air is occuring opens said normally closed contacts to temporarily prevent operation of the air cooling means for dehumidification when the air heating means is operating and heating said air.
Claim 3
Dependent Claim
114 words
The control arrangement of claim 1, wherein said heat exchanger is downstream of said means for moving the air, and, said air cooling evaporator is downstream of said heat exchanger whereby moving air passes first through said heat exchanger and then through said evaporator; and, means for sensing air temperature positioned to monitor temperature of air flowing across said air cooling evaporator and said means for sensing has contact means electrically connected in series with said humidity responsive means to prevent operation of the air cooling means for lowering humidity when air flowing across the air cooling evaporator is hot and above a predetermined temperature to thereby prevent damage to said air cooling evaporator.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |