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Posted by Ziad Saad on March 14, 2008 at 21:54:58:
In Reply to: Re: Normal Boiler Pressure Range posted by Steve R. on March 13, 2008 at 20:30:38:
: Where is the fill valve located on the system?
There is a pressure reducing valve that feeds, through a one-way valve, into the return line just before the 1st pump (on the suction side). The pressure still rises to 20-25 even if the supply to the fill valve is shut off and then returns to 12psi after it cools down back to room temperature.
: Where is the expansion tank located in reference to the fill valve.
The expansion tank is on the supply line.
: Is this a pump or gravity system?
I have two pumps, one for the basement heating circuit and another one for the two floors above.
thanks,
ziad