Thread: Tiger Loop Question

Looking at an oil furnace yesterday. Nice clean newer unit that appears well maintained.

When the furnace first fired up there were serious amounts of air bubbles in the tiger loop glass. My understanding was that if bubbles were visible then there must be air being sucked into the oil supply line and then evacuated by the Tiger Loop unit.

This would require repair/replacement of the oil line would it not?

However, after the furnace ran for about 2 to 3 minutes the bubbles stopped.

What is going on and what are your ideas for recommendations.

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Tank location? Oil could be siphoning back to the tank.

Tank is buried in the side yard.

The tiger loop was designed to stop nuisance calls on airbound pumps, the reasons for air are many,leaky supply tubes,,cavitation from restricted lines, lack of proper venting of tanks, and siphoning from underground tanks( no proper check or foot valves)The loop itself acts as a return line making a pump act as if it was a 2 pipe system. If the system runs well with the Tiger Loop I would leave it alone and not flag it as it is running to specs with it.

Thank You Dave