US4141408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supplementary heat control for heat pump system
Assignee: Rheem Manufacturing Co
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Filing: 1976-06-16
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Granted: 1979-02-27
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Expires: 1996-06-16
Abstract
Abstract A supplementary heat control for a heat pump system includes thermostatic sensors on the downstream side of the heat pump heating coil. The sensors upon sensing temperature differentials in the heated air stream which indicate the need for supplemental heat operate relays. The relays, in turn, activate power input to supplementary heating coils downstream from the thermostatic sensors. A plurality of sensors are disclosed for sensing differential temperature differentials and thus permitting staging of supplementary heat.
Inventors
- 👤 Jack V. Garnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:09
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1084; F24D19/1087; F24H; F24H15/00; F24H15/20; F24H15/208; F24H15/30; F24H15/355; F24H15/37
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
149 words
In a heat pump system, the improvement of apparatus for controlling supplementary heat input into the heating cycle of the heat pump system, said system of the type having a cool air inlet, a warm air outlet, a heating coil intermediate the inlet and outlet, and means for moving air from the inlet over the coil to the outlet, said apparatus comprising in combination: at least two thermostatic sensors at the downstream side of said coil between the inlet and outlet, and auxiliary heat means associated with each sensor downstream from said associated thermostatic sensor between the inlet and outlet, control means operative in response to a signal from each thermostatic sensor means, said auxiliary heat means arranged in parallel, and said control means arranged in series to sequentially control the auxiliary heat means and provide supplemental heat to air flowing over the coil between the inlet and outlet.
Claim 2
Dependent Claim
149 words
In a heat pump system, the improvement of apparatus for controlling supplementary heat input into the heating cycle of the heat pump system, said system of the type having a cool air inlet, a warm air outlet, a heating coil intermediate the inlet and outlet, and means for moving air from the inlet over the coil to the outlet, said apparatus comprising in combination: at least two thermostatic sensors at the downstream side of said coil between the inlet and outlet, and auxiliary heat means associated with each sensor downstream from said associated thermostatic sensor between the inlet and outlet, control means operative in response to a signal from each thermostatic sensor means, said auxiliary heat means arranged in parallel, and said control means arranged in series to sequentially control the auxiliary heat means and provide supplemental heat to air flowing over the coil between the inlet and outlet.
Claim 3
Dependent Claim
38 words
The improved apparatus of claim 1 wherein the thermostatic sensors are set to detect discrete temperature differences before operating their respective control means, the temperature difference for each successive sensor being greater than that of the subsequent sensor.
References Cited (Backward Citations)
US2498861A
Cited
US3127930A
Cited
US3006613A
Cited
US3167114A
Cited
US3261395A
Cited
US3318372A
Cited
US3385349A
Cited
US3444923A
Cited
US3588471A
Cited
US3867979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |