air bubbles in furnace

14 years ago

I have an oil fed forced hot air heating system with the oil tank

outside under the porch . Since I moved in 13 years ago, I would get

air into the furnace and have to bleed it due to the heat shutting

off. This would happen only once every year and had no correlation to

the tank being filled, nor to the approximate level of oil in the tank

( it's a side-lying tank with no gauge). The problem continued even

when I replaced the furnace 8 years ago and the hvac repair man hasn't

found any loose connections inside.

Does anyone have any idea why this would happen with such regularity

and infrequency? Could the 2 line system be the cause?My major

concern is freezing pipes,etc if I were to go away for several days in

the winter.

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