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mdparis

11:59AM | 11/28/08
Member Since: 11/27/08
2 lifetime posts
Bvhvac
I'm totally stumped.

My system is nearly from 1965, supplied by a 100 foot well and has run without a hitch all these years.

Suddenly we began getting a lot of air bubbling in the pipes on all three floors of the house in each zone.

Zone cocks were drained on each floor and each zone was flushed fully at basement level till water ran clear and no air was found. Air was right back within hours and continues to return regardless of bleeding and purging of the system. We can find no leakage and the boiler isn't calling for excessive water.

Pressure tank checks out fine and there is no air whatsoever in the main household water system - only the boiler for the hot water heating system.

Any ideas???

mdparis

02:03PM | 11/30/08
Member Since: 11/27/08
2 lifetime posts
The unit is an old (45 years) HydroTherm and I can't see anything that look remotely like a seal anywhere.

Admittedly I am an old disabled vet so I'm unable to be crawling around looking into and under it - however, as I indicated, there is absolutely no sign of a water leak ANYWHERE that would allow air to infiltrate and a water leak as it would ultimately have to reveal itself in the basement or around the baseboards, that's the big stumper.

The pressure tank is intact with the correct 20 lb pressure as called for.

The pump is circulating. Thermostats are calling for heat.

Still, it's double bubble, toil and trouble...
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