Combustion – Timer – programmer – retarder or condition responsive control – Of or by exhaust damper or exhaust pump
Patent
1980-09-15
1983-02-15
Dority, Jr., Carroll B.
Combustion
Timer, programmer, retarder or condition responsive control
Of or by exhaust damper or exhaust pump
236 15C, F23N 300
Patent
active
043738974
ABSTRACT:
Apparatus is provided for modifying an open draft hood furnace and its control system, to produce an induced draft furnace having increased efficiency. A blower located in the furnace exhaust stack is used to induce movement of air and combustion products into and through the draft hood. A flow-limiting orifice located in the exhaust stack upstream from the blower causes a region of reduced pressure to exist downstream from the orifice. A pressure signal representative of the flow rate of exhaust stack gases is sensed on the downstream side of the orifice and is communicated by a conduit to a pressure switch connected to a gas valve, which together control gas to the burner. No gas is permitted to flow to the burner unless a predetermined reduced pressure level is achieved at the downstream side of the orifice. A small opening in the conduit permits a small flow of flushing air to enter the conduit.
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Blinn Clyde C.
Dority Jr. Carroll B.
Hemphill Stuart R.
Honeywell Inc.
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