Control units
AssigneeT.I. Domestic Appliances Limited
InventorJoseph W. White
Life of this patent
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Abstract
A control unit for a gas-fired water heater comprises a resiliently-loaded main valve for controlling gas flow to a gas burner of the heater, the main gas valve being opened and closed by a flexible diaphragm exposed to pressure of water flowing through the water heater. A subsidiary gas valve located upstream in the gas supply of the main gas valve has a permanently open by-pass and is actuable by a user operated control which also adjusts the resilient loading of the main gas valve in such manner as to adjust the rate of water flow and the rate of gas flow to provide hot water of a required temperature and at a required rate of flow.
Claims7
A control unit for a gas-fired water heater comprising a water flow passageway having an inlet and an outlet, water flow responsive means connected to said inlet, a gas flow passageway having an inlet and an outlet, a first gas flow control valve in the gas passageway, a linkage interconnecting the first gas valve with the water flow responsive means, a further gas flow control valve in said gas passageway, water flow control means for controlling water flow through said water passageway, and a user operated control interconnected with said further gas flow control valve and with said water flow control means whereby operation by a user of said user operated control sets both the gas flow along said gas flow passageway and the water flow along said water flow passageway.
Dependencies are inferred from the claim text.