Patent US4352453A successfully refreshed from Google Patents.
US4352453A
Expired / Lapsed
US
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Fan control for variable air volume terminal unit
Assignee: Madison Management Group Inc
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Filing: 1981-01-19
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Granted: 1982-10-05
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Expires: 2001-01-19
Abstract
Abstract Disclosed is a terminal unit for an air conditioning system. The apparatus has a common chamber for primary and secondary air and a throttling valve at the primary air duct connection controlled by a zone thermostat. The terminal unit fan is independently controlled by an air flow sensor located ahead of the throttling valve in order to prevent fan overload.
Inventors
- 👤 John C. McNabney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:16
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/04; F24F11/00; F24F11/89; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1925
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
An air conditioning system terminal unit comprising: a mixing box with a primary air inlet communicating with a source of pressurized air, a secondary air inlet, and an outlet; an electric fan located at the outlet; a throttling valve located at the primary air inlet; throttling valve controls comprising means responsive to the temperature at a preselected location actuating the throttling valve; and flow sensing means located in the primary air duct, ahead of the throttling valve, actuating the fan at a predetermined volume of primary air, independent of the throttling valve controls.
Claim 2
Dependent Claim
93 words
An air conditioning system terminal unit comprising: a mixing box with a primary air inlet communicating with a source of pressurized air, a secondary air inlet, and an outlet; an electric fan located at the outlet; a throttling valve located at the primary air inlet; throttling valve controls comprising means responsive to the temperature at a preselected location actuating the throttling valve; and flow sensing means located in the primary air duct, ahead of the throttling valve, actuating the fan at a predetermined volume of primary air, independent of the throttling valve controls.
Claim 3
Dependent Claim
23 words
The combination set forth in claim 1 wherein the throttling valve is actuated by compressed air originating at a zone pneumatic wall thermostat.
Claim 4
Dependent Claim
29 words
The combination set forth in claim 1 wherein the flow sensing means is of the air pressure type, actuating an air flow switch which energizes the terminal unit fan.
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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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |