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Posted by HeatPro on December 06, 2004 at 15:08:49:
In Reply to: air in hydronic system despite automatic vents posted by Dave on December 06, 2004 at 12:49:08:
: I was told that the thing to do would be to have someone in the basement to turn on the water inflow and then watch for when water comes out in the attic at the highest vent. This would give the working pressure for the boiler.Does this seem right?
*** that is right.
***Your boiler might not be approved to be swapped to a 40 psig relief; the maker would be able to tell you.
***The expansion tank pressure would be set to the pressure found by filling to the top of the system.
When there is 4 pounds pressure at the top of the system, the air will be able to leave the automatic vents.