Pressure Atomizing Oil Burner Equipment and Systems – Fuel Flow and Combustion Controls
A 1920’s automated combustion controller for Canadian oil fired, home heating systems, with Bourdon tube actuated mercury switch for “pressure ignition control” and “Adjustatherm,” safety cut-out, marketed in Ottawa by Shaver Bros, Type SDP 22, , Mercoid Corp., Circa 1929. [partial assembly only]
Features: – high style, brass name plate with logo and graphics in red and black
– Stencilled for Shaver Bros Ottawa
Technical Significance:
– Representative of the earliest automatic combustion control technology for oil fired domestic heating systems marketed in Canada, using oil pressure to actuate electric ignition transformer at predetermined set point, and a temperature sensing stack switch, as safety device, in case of flame failure. See schematic diagram.
– Representative, too, of the earliest complex systems introduced into the Canadian home. See Note #1
Industrial Significance:
– Mercoid, a name no doubt derived from the company’s reliance on mercury bulb switching, would prove to be a time honoured one in the HVACR field as it evolved over the 20th century and into the 21st. Current catalogues show similar Bourdon tube driven mercury bulb switching, as used in this 1920’s device [See Dwyer Instruments Web site]