Control systems for gaseous fuel fired appliances
AssigneeRadiation Limited
InventorHarald Engelbert
Life of this patent
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Abstract
A control unit for a gas-fired appliance comprises a service tap that acts also as a flame failure device. The flame failure device controls gas flow to a gas governor which is an integral part of the unit and associated with the gas governor is a low gas pressure cut-off. The unit also incorporates a modulating gas flow control valve operatively coupled to a thermostat which, in the case of a gas-fired water heater, is responsive to water temperature in the heater. When used with a water heater, the unit also includes a further thermostat set to terminate gas flow in the event that a predetermined maximum water temperature is exceeded.
Claims17
A control system for a gaseous fuel fired appliance, said system comprising a gaseous fuel flow control means including a first flow control member for controlling fuel flow from a fuel inlet to a fuel outlet, a passage between said fuel inlet and outlet by-passing said first flow control member, a second flow control member for controlling fuel flow along said passage, a movable member, means for actuating said movable member, a linkage interconnecting the movable member and the first flow control member for transmitting to the latter movement of the movable member, means for varying the ratio of movement of the movable member to movement of the first flow control member, means for moving both the first flow control member and the second flow control member as a unit between an "off" position in which fuel flow from said inlet to said outlet and along said passage is prevented and an "on" position in which said fuel flow is permitted and from which on position further movement of the first flow control member to regulate the flow of fuel from the inlet to the outlet is effected by the movable member, and further means for adjusting the effective cross-sectional area of the passage to control the maximum rate of fuel along the passage and thus from said inlet to said outlet when said first flow control member is closed.
Dependencies are inferred from the claim text.