Title: Control systems for gaseous fuel fired appliances

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.

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Inventors: Engelbert, Harald (London, EN)

Application Number: 417284
Filing Date: 1973-11-19
Publication_date: 1976-02-17
Assignee: Radiation Limited (London, EN)
Primary Class(es): 431/47 137/630.14, 137/630.15, 236/1H, 251/234, 431/54, 431/255
Other Classes:
US Patent Ref:

393020	Nov, 1888	McLaren	251/234.
1696143	Dec, 1928	Hinchman	137/494.
2191078	Feb, 1940	Kehl	239/414.
2355043	Aug, 1944	Adlam	236/91.
3190314	Jun, 1965	Visos et al.	137/630.
3275035	Sep, 1966	Freeby et al.	137/630.
3314448	Apr, 1967	Wolff et al.	137/629.
3508567	Apr, 1970	Kirk et al.	251/234.

Other Refs:
Primary Examiner: Dority, Jr., Carroll B.
Assistant Examiner:
Attorney: Brisebois & Kruger