Without a Combustion Analayer it is impossible to set up an oil fired boiler. the Velaire was fitted with two diffrent burners an Electro-oil inter (orange colour)
or a Riello Mectron (either silver alluminium or in a Red Box, these burners (both good) operate in very different ways so it is hard to suggest a diagnosis without being in front of the boiler
www.oftec.org will assist you in finding a competent oil engineer in your area it would be money well spent
www.elanar.co.uk, May 2009
