US4265299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump control system
Assignee: York International Corp
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Filing: 1979-09-28
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Granted: 1981-05-05
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Expires: 1999-09-28
Abstract
Abstract A control system for a heat pump having at least one stage of supplemental heaters, said control system including an electronic thermostat capable of (1) sensing the rate of change of the temperature in the (indoor) conditioned space; and (2) bringing on supplemental heat, following temperature setup of the thermostat, only if the rate of temperature change is below some predetermined value. A suitable time delay can be built into the control to allow the heat pump to stabilize and therefore give a more realistic indication of the ability of the heat pump to handle a given load.
Inventors
- 👤 James R. Harnish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:38
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1912; F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; F24D19/1009; F24D19/1039
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
In combination with a heat pump of the type including at least one stage of supplemental heat, a control system comprising: temperature sensing means for sensing the indoor conditioned space temperature; means for comparing the temperature sensed with a reference temperature to determine the rate of temperature change in said indoor conditioned space temperature; and means for initiating supplemental heat following temperature setup of said temperature sensing means only if the rate of temperature change is below some predetermined value.
Claim 2
Dependent Claim
80 words
In combination with a heat pump of the type including at least one stage of supplemental heat, a control system comprising: temperature sensing means for sensing the indoor conditioned space temperature; means for comparing the temperature sensed with a reference temperature to determine the rate of temperature change in said indoor conditioned space temperature; and means for initiating supplemental heat following temperature setup of said temperature sensing means only if the rate of temperature change is below some predetermined value.
Claim 3
Dependent Claim
38 words
A system as defined in claim 1 wherein said temperature sensing means includes a two stage control with a first stage controlling the operation of said heat pump and second stage controlling the operation of said supplemental heat.
Claim 4
Dependent Claim
25 words
A system as defined in claim 2 wherein said second stage is initiated only if the space temperature is lower than the first stage setting.
Claim 5
Dependent Claim
44 words
A system as defined in claim 1 including more than one stage of supplemental heat; and means for initiating an additional stage if the temperature rate of change has not reached a desired level after operation with a lesser number of supplemental heater stages.
Claim 6
Dependent Claim
24 words
A system as defined in claim 2 including time delay means for delaying activation of supplemental heat to allow the system to establish equilibrium.
Claim 7
Dependent Claim
24 words
A system as defined in claim 4 including time delay means for delaying activation of supplemental heat to allow the system to establish quilibrium.
References Cited (Backward Citations)
US3444923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |