Open draft hood furnace control using induced draft blower and exhaust stack flow rate sensing
Patent
·
OSTI ID:6128145
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.
- Assignee:
- Honeywell Inc
- Patent Number(s):
- US 4373897
- OSTI ID:
- 6128145
- Country of Publication:
- United States
- Language:
- English
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