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Posted by HeatPro on March 01, 2005 at 22:23:38:
In Reply to: tinfoil helmet in place posted by mystified on March 01, 2005 at 20:29:25:
An expansion tank set at 15 psig from the factory won't start to accept water until the pressure gets to 15 psig, so if the system pressure is below that, it won't take much loss of water or air to drop the pressure on the gauge. Take a look at the instructions on how to fill the system and prepare the tank to accept at a lower pressure here:
Fill the system to the minimum pressure
http://64.226.150.132/hydronic/service/purgeair.htm#fill