Combustion – Timer – programmer – retarder or condition responsive control – Of or by exhaust damper or exhaust pump
Patent
1978-03-13
1980-02-19
Dority, Jr., Carroll B.
Combustion
Timer, programmer, retarder or condition responsive control
Of or by exhaust damper or exhaust pump
431 6, 236 1G, F23N 100, F23N 520
Patent
active
041892968
ABSTRACT:
A control system for use with gas-fired appliance installations, such as a furnace, includes a switch responsive to normal draft levels in the vent stack. At the start of a heating cycle, and in the absence of draft, the switch permits a pre-draft enabling circuit to tentatively enable the furnace controller for a predetermined time. The controller opens a stack damper plate and actuates the ignition system and gas valves of the furnace. If draft is not established within the predetermined time, the pre-draft enabling circuit times out and the gas is shut off. If normal draft is sensed within the predetermined time, the draft responsive switch permits the furnace controller to be operated as long as the thermostat calls for heat. If, for any reason, draft subsequently stops, the control system re-cycles itself; and if draft is not re-established before the pre-draft enabling circuit times out, the system deactivates the furnace controller. The control system also includes a normally closed barometric damper, which is mounted in the vent stack and is responsive to both excessive positive pressure and to excessive draft (sub-ambient pressure) to open, and thereby neutralize the excessive positive pressure or draft.
REFERENCES:
patent: 2154644 (1939-04-01), Sweatt
patent: 2155642 (1939-04-01), Dewey
patent: 2188865 (1940-01-01), Maynard
patent: 2377356 (1945-06-01), Miller
patent: 3311302 (1967-03-01), Merckle
patent: 3449055 (1969-06-01), Blackett
patent: 3768956 (1973-10-01), Mueller et al.
patent: 3934796 (1976-01-01), Smith, Jr. et al.
Barrett Lee E.
Dority Jr. Carroll B.
Johnson Controls Inc.
LandOfFree
Method and apparatus for controlling furnace does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for controlling furnace, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for controlling furnace will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-651787