GB1288534A - - Google Patents

Abstract

1288534 Control and monitoring apparatus for oil or gas burners LANDIS & GYR AG 26 May 1971 [11 June 1970] 17316/71 Heading F4T A control and monitoring apparatus for an oil burner comprises a bimetallic element 1 with a heating winding 5 in parallel with an ignition transformer 24, three contact springs 4, 13 and 14 whereof spring 13 is pre-stressed to lie against spring 4 which is fixedly coupled to the bimetallic element 1, and an electromagnet 15 energized by a flame detector 27 and amplifier 26 whereby to attract its armature 16 bring an. arm 17 therein into engagement with the contact springs, such that in use closing switch 22 initiates ignition and heating of element 1 thereby moving springs 4 and 13 across to contact spring 14 also which contact supplies fuel to the burner through a valve 25, the burner flame then causing arm 17 to maintain springs 13 and 14 in contact but breaking contact between springs 4 and 13 to shut off the ignition. If no flame is produced the ignition circuit remains unbroken and element 1 trips a control pawl 7 to break contact between further springs 8 and 9 in the electric supply circuit and also to operate a fault indicating lamp 28 by contact between springs 8 and 10. A manual resetting device 18, 19 is provided. If flame detector 27 which may be a photoelectric resistor senses a premature flame simulation, arm 17 is brought down to prevent springs 4 and 13 from making contact with spring 14 when element 1 is subsequently heated. Switch 22 is controlled by a temperature regulator associated with the burner. A motor 23 is also provided to operate an oil pump and a blower for the combustion chamber. A further bimetallic element 12 is provided having greater thermal inertia than element 1 so as to trip pawl 7 in the case of reduced voltage or intermittent operation of winding 5. Both elements 1 and 12 are mounted by means of a compensation element 11.