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Posted by Oskar Bosch on January 22, 2008 at 19:35:27:
In Reply to: Re: Burnham revolution boiler leaks through regulator valve posted by Derek on January 21, 2008 at 10:25:25:
: What does the pressure gauge read?
: Does the pressure increase when the boiler is running?
: The first suspect is the expansion tank.
Derek, thanks for the quick reply.
I had to install a new pressure gauge, as the one on the boiler is dead. Anyway, the pressure goes from 32lbs downto zero?
I got a pressure gauge that reads up to 160, so it is kind of inaccurate in the lower range. But what seems to happen is that the pressure raises when the boiler is active (flames going). When the flames go out, the pressure slowly goes down. The zone keeps asking for heat though.
So it seems an up-down-up-down movement (flames on - flames off - flames on - flames off) of the pressure.
The pressure gauge was mounted on the return from the zone asking for heat.
What puzzles me is how the system can keep leaking water, over 2 buckets by now, with the water inlet shutoff. So no new water is entering the system, yet it keeps loosing water.
Could this be air in the system? Is this the expansion tank?
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