Combustion – Timer – programmer – retarder or condition responsive control – Of or by exhaust damper or exhaust pump
Patent
1976-10-18
1978-07-25
Dority, Jr., Carroll B.
Combustion
Timer, programmer, retarder or condition responsive control
Of or by exhaust damper or exhaust pump
431 21, 236 1G, 126285B, F23N 304
Patent
active
041026292
ABSTRACT:
In a fuel-burning device having a combustion chamber, a burner with a control, an exhaust stack connected to said chamber, an air diverter in said stack and a thermostat connected to said burner control; the improvement which comprises a damper section in the stack downstream of the diverter. The damper is disposed within and journalled upon bearings attached to the damper section. A motor on the damper section has an output shaft connected to the damper and includes a rotary switch on said shaft. An electrical circuit includes a relay switch interconnecting the thermostat, burner control, motor and rotary switch. The motor output shaft is intermittently rotatable through successive arcs of 90.degree., through 360.degree., whereby the damper normally closes the stack preventing escape of room air therethrough when the burner is not operating. The thermostat, when calling for heat, closes the circuit to the motor rotating the damper 90.degree. to open position and successively energizing the burner. The thermostat, when no longer calling for heat, closes a portion of the circuit activating the motor causing rotation of the damper an additional 90.degree. in the same direction to stack closing position and to successively deenergize said burner after the damper and rotary switch have rotated several degrees. The damper has a weight biasing it to open position. A fusible link interconnects the motor output shaft and damper whereby, if the burner fails to shut off with the damper closed, hot exhaust gases fuse the link and the damper rotates automatically to open position.
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Dority Jr. Carroll B.
Paragon Resources, Inc.
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