GB1268402A - Gas fired water heaters - Google Patents

Abstract

1,268,402. Water heaters. JOH. VAILLANT K.G. 14 May, 1969 [2 Aug., 1968], No. 24549/69. Heading F4A. A gas fired instantaneous water heater having a heat exchanger 6<SP>1</SP> at the upper end of a heating shaft 6, has a pair of exhaust gas hoods 7<SP>1</SP> arranged as exchangeable units, one of the hoods 7<SP>1</SP> carrying an exhaust gas blower 10 and the other a back draught restricting safety device (9), Fig. 2 (not shown). A support 12 serves to mount the selected hood on the rear wall of the heater casing 2. The blower 10 is integral with the hood 7<SP>1</SP> and also with its motor 10<SP>1</SP> which rotates about a vertical axis and has a vertical suction branch 11 and a horizontal discharge branch 10<SP>11</SP> connected to an exhaust pipe 14. The suction branch 11 has a flange 11<SP>1</SP> bolted in adjustable angular positions to a fixed mating flange 12<SP>1</SP>, Fig. 5, whereby the discharge branch 10<SP>11</SP> is angularly adjustable and may be connected alternatively to exhaust ducts 14<SP>1</SP>, 14<SP>11</SP>. In a modification, Figs. 6, 7 (not shown), the casing has an upper end face into which merges a discharge opening of the hood (7<SP>11</SP>) and the/blower 10 is angularly adjustable to vary the direction of the exhaust branch 10<SP>11</SP>. The blower 10 and motor 10<SP>1</SP> are covered by a hood shaped casing (16). In a further modification, Fig. 9, the blower 17 has a tangential discharge branch 1711 with its axis perpendicularly above the centre of the flange 11<SP>1</SP>, remaining radial to the flange in all angular positions of the gas blower 17, and the suction branch 18 is eccentrically mounted relative to the flange 11<SP>1</SP> by an inclined pipe connecting piece 19. In yet another modification, Fig. 10 (not shown), the exhaust pipe (14) has an expanded section (20) into which the discharge branch (10<SP>11</SP>) extends for draught control.