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Posted by John on November 21, 2007 at 23:44:00:
In Reply to: Re: Laars/Endurance Relief Valve Leak posted by Jeff S on November 21, 2007 at 21:57:55:
I have a similar situation with a Trainco Heatmaker. The pressure changes excessively from cold to hot. I've had the unit serviced several times without any improvement. I think there's more to the expansion tank and it's pressure than meets the eye. It's in the system to prevent this problem we both seem to have. If it comes from the factory with a 15 psig charge and it's installed in a system that adds 15 pounds to oppose it, it seems to me that the pressure on the air side will go above the initial 15# charge. My thinking is that the air charge might need to be increased but I'm not sure.
I have globe valves on both sides of my 'auto-fill' valve that I keep closed unless I'm adding water.
Good luck, but don't hold your breath for answers from this web site - I've been very disappointed.
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