Patent US4140067A successfully refreshed from Google Patents.
US4140067A
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Furnace control system
Assignee: T JENSEN ASSOC Inc
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Filing: 1977-10-27
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Granted: 1979-02-20
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Expires: 1997-10-27
Abstract
Abstract A furnace control system to control burner operation of a multifuel furnace to reduce primary fuel consumption of either oil or gas of the multifuel furnace. The system controls a primary fuel to initially kindle a secondary fuel when the fire reaches a self-sustaining burning rate, the primary fuel is shut off but the burner fan continues to run to force a draft and insure complete combustion of the secondary fuel and the volatile gases. The furnace control system is utilized as original equipment manufacturer incorporated into the controls for a burner of a multifuel furnace or as a retrofit furnace control system to control the burner operation of the multifuel furnace.
Inventors
- 👤 Thomas A. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:44
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/02; F23N1/025; F23N2237/00; F23N2237/02; F23N2237/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
168 words
A fuel control system to control burning of a primary and a secondary fuel in a multifuel furnace comprising: a. fuel burning chamber means in a multifuel furnace for burning a primary fuel and a secondary fuel; b. primary fuel burner for igniting fuels; c. burner fan means for introducing air into said fuel burning chamber; d. heat exchanger means in said fuel burning chamber; e. circulating fan means to transfer heat from said heat exchanger means to a surrounding environment; f. a combination fan limit control means connected to said burner fan means for controlling the supply of air to said fuel burning chamber means; g. a first relay means connected to said combination fan limit control means whereby said relay is actuated every time said combination fan limit control means is energized; and; h. lock-out means connected to said first relay means whereby said first relay means is disabled by said lock-out means after a predetermined number of energizations of said combination fan limit control means.
Claim 2
Dependent Claim
168 words
A fuel control system to control burning of a primary and a secondary fuel in a multifuel furnace comprising: a. fuel burning chamber means in a multifuel furnace for burning a primary fuel and a secondary fuel; b. primary fuel burner for igniting fuels; c. burner fan means for introducing air into said fuel burning chamber; d. heat exchanger means in said fuel burning chamber; e. circulating fan means to transfer heat from said heat exchanger means to a surrounding environment; f. a combination fan limit control means connected to said burner fan means for controlling the supply of air to said fuel burning chamber means; g. a first relay means connected to said combination fan limit control means whereby said relay is actuated every time said combination fan limit control means is energized; and; h. lock-out means connected to said first relay means whereby said first relay means is disabled by said lock-out means after a predetermined number of energizations of said combination fan limit control means.
Claim 3
Dependent Claim
16 words
The fuel control system of claim 1 wherein said first relay means is a stepping relay.
Claim 4
Dependent Claim
18 words
The fuel control system of claim 1 wherein said first relay means is a six position stepping relay.
Claim 5
Dependent Claim
18 words
The fuel control system of claim 1 wherein said first relay means is a twelve position stepping relay.
Claim 6
Dependent Claim
19 words
The fuel control system of claim 1 wherein said predetermined number is six to lock-out said first relay means.
Claim 7
Dependent Claim
37 words
The fuel control system of claim 1 wherein said lock-out means comprises a second relay means connected to first relay means whereby said second relay means disables said first relay means after said predetermined number is reached.
Claim 8
Dependent Claim
16 words
The fuel control system of claim 6 wherein said second relay means has normally closed contacts.
Claim 9
Dependent Claim
35 words
The fuel control system of claim 8 further comprising a third relay means connected to said second relay means whereby said third relay means closes a primary fuel valve after a predetermined temperature is reached.
Claim 10
Dependent Claim
16 words
The fuel control system of claim 8 wherein said third relay means has normally open contacts.
Claim 11
Dependent Claim
41 words
The fuel control system of claim 9 further comprising a fourth relay means connected to said second relay means whereby said fourth relay means in series with a primary fuel pressure switch disables a cadmium cell in said primary fuel burner.
Claim 12
Dependent Claim
16 words
The fuel control system of claim 10, wherein said fourth relay means has normally open contacts.
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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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |