Stack damper control arrangement
US4017024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1975 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Dec 3, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2235/10
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A stack damper control arrangement for use in a heating system including a furnace having a fuel-fired burner apparatus and a vent stack for conducting combustion products away from the burner apparatus and a damper plate pivotally mounted within the stack and movable between a fully open and a fully closed position, includes a reversible drive motor which is energizable in response to a request for heat to drive the damper plate to the open position, a first limit switch operated when the damper plate reaches the open position to effect the deenergization of the motor, the motor being reenergized at the end of the heating cycle to drive the damper plate to the closed position, and a second limit switch operated when the damper plate reaches the closed position to effect the deenergization of the motor. The damper control arrangement is described with reference to a heating system including a gas fired burner and redundant gas valves wherein operation of a first one of the gas valves is effected through operation of the first limit switch and thus is conditional upon the damper being fully open, and wherein the supply of fuel to the second valve is conditional upon the operation of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.