Claims
- 1. In a heating apparatus of the type including a fluid fuel burner, a vent for discharging the products of combustion produced by said burner, a supply line for supplying fluid fuel to said burner and a main valve means operable between open and closed positions for controlling the flow of fuel through said supply line to said burner, the improvement comprising:
- at least one damper means movable between open and closed positions for controlling flow through said vent;
- expansible chamber fluid motor means connected to said flow control damper means for moving said damper means to an open position when pressurizied and to a closed position when unpressurized;
- connection means for pressurizing said expansible chamber motor means whenever said main valve means is in an open position;
- a pressure-operated control valve in said supply line between said main control valve and said burner for preventing flow of fuel to said burner until pressurized; and,
- means for pressurizing said pressure-operated control valve only when said motor means operates to open said damper means.
- 2. The improvement as defined in claim 1 wherein said expansible chamber motor means includes control means for preventing pressurization of said pressure-operated control valve until said damper means are in an open position.
- 3. The improvement as defined in claim 2 wherein said control means comprises a valve driven by said expansible chamber motor means.
- 4. The improvement as defined in claim 2 wherein said expansible chamber motor means comprises a movable diaphragm forming a wall of said chamber, said chamber being connected for pressurization by said fuel whenever said valve is in an open position.
- 5. The improvement as defined in claim 4 wherein said diaphragm is mechanically linked to said control means.
- 6. The improvement as defined in claim 4 wherein said control means comprises a valve element linked to said diaphragm.
BACKGROUND OF THE INVENTION
This application is a continuation-in-part of my prior application Ser. No. 704,548, filed Aug. 12, 1976, now U.S. Pat No. 4,076,171 for Damper Control Apparatus.
US Referenced Citations (6)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
704548 |
Aug 1976 |
|