sorry can't see any detail. can't enlarge it
If it's a sealed system its most likely a pressure gauge.
What's written on the dial, pressure will be in 'bars'
When your burner is commissioned, it has to be set up to be as economical and as clean burning as possible.
Every burner has its own specification from the manufacturer, and basically what an oil man will do is to set the oil pump pressure (usually between 100 and 150 psi) with a pressure gauge.
He will then check the amount of carbon dioxide produced by the burner by putting a gas analyser probe into the flue. He will adjust the air door setting until he gets the correct reading - typically around 11% CO2.
The air door is numbered so that it gives the oil man a starting point.
Hope this helps you to understand a bit better!
John
Indeed you are most welcome.....its important not to adjust any of the settings without the full analysis kit, unfortunately - but loads of people do!
John
Its likely that the boiler will seriously soot up internally and produce copious amounts of carbon monoxide, or alternatively its possible to burn out the flue baffles or heat exchanger, or cause local boiling inside the boiler.
Not desirable in either way!
John
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