Combustion – Timer – programmer – retarder or condition responsive control – Of or by exhaust damper or exhaust pump
Patent
1978-11-13
1980-12-16
Wayner, William E.
Combustion
Timer, programmer, retarder or condition responsive control
Of or by exhaust damper or exhaust pump
236 1G, 236 15C, F23N 300
Patent
active
042394775
ABSTRACT:
A furnace ignition and draft control system includes a damper plate movable under control between a closed and an open position. When a call for heat signal is generated, a holding relay is actuated to energize a damper motor to open the damper provided the damper plate was closed when the signal was generated, otherwise the system will not operate. After the damper is run to the full open position and this is proved, a fuel control circuit is actuated to supply fuel to the furnace, and a trial-for-draft period is initiated. A draft controller energizes the damper motor to open the damper if draft is less than a first predetermined value and to close the damper if draft is greater than a second predetermined value. The predetermined draft values define a desired draft range in which the damper is not operated. If a draft greater than the second value is sensed within the trial period, the draft controller partially closes the damper to control the draft value within the desired draft range, otherwise the system locks out at the end of the trial period. If draft is lost at any time, the controller moves the damper to the open position and a loss-of-draft safety timing period commences. If draft is not reestablished during this period, the system shuts off the fuel and locks out. If the call for heat is satisfied, the system closes the damper and is prepared for another operating cycle, having tested the operativeness of all major components without failure. Any failure would have locked the system out.
REFERENCES:
patent: 2155642 (1939-04-01), Dewey
Johnson Controls Inc.
Wayner William E.
LandOfFree
Furnace ignition system with draft control and loss-of-draft pro does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Furnace ignition system with draft control and loss-of-draft pro, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Furnace ignition system with draft control and loss-of-draft pro will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-605658