| US 7,568,908 B2 | ||
| Low fire start control | ||
| Gary J. Potter, St. Charles County, Mo. (US) | ||
| Assigned to Cambridge Engineering, Inc., Chesterfield, Mo. (US) | ||
| Filed on Aug. 19, 2002, as Appl. No. 10/223,556. | ||
| Application 10/223556 is a continuation of application No. 09/574338, filed on May 20, 2000, abandoned. | ||
| Claims priority of provisional application 60/135067, filed on May 20, 1999. | ||
| Prior Publication US 2003/0003411 A1, Jan. 02, 2003 | ||
| Int. Cl. F23N 1/00 (2006.01); F23N 5/00 (2006.01); F23N 5/26 (2006.01) | ||
| U.S. Cl. 431—62 [431/2; 431/18; 236/1 E; 236/1 EB] | 5 Claims |
| 1. A control system for a direct fire gas burner comprising:
a modulating valve for controlling gas output to the burner;
a control in electrical communication with the burner and with said modulating valve;
said control providing a low fire start gas condition of the burner above a minimum firing rate as said control interrupts
electrical power to said modulating valve therein adjusting the flow of gas attaining a low fire start;
one of a space temperature selector in electrical communication with said valve and said control and a discharge temperature
sensor in electrical communication with said valve and said control; and,
a simulated resistance circuit within said control capable of driving the modulating valve to an open setting in response
to a resistance setting; the simulated resistance circuit comprising:
a first bypass circuit which bypasses said space temperature selector, said first bypass circuit including contacts to selectively
open and close said first bypass circuit; and,
a second bypass circuit which bypasses said discharge temperature sensor; said second bypass circuit including contacts to
selectively open and close said second bypass circuit.
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