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Was typing fast, lots of spelling errors.
Anyway, Occasionally your boiler will need a little water i.e. it is low on pressure. Above or near your boiler will be an expansion tank to keep pressure on the system like a pillow/bladder. If the pressure gets too low the boiler will need water from the "street". Some boilers do this just with a manual valve. MOst have a combination pressure regulator set at 15 psi and a relief valve that opens if pressure is excesive. Before this combination valve you you will have a manual shutoff. I keep mine closed normally and open it on occasion, just so if a leak springs when I'm away the house doesn't flood too bad.
What I am saying is as you let air out of you pipes, it is going to want to replace it with water. That expansion tank will compensate to some degree. But if your "street" "make-up" "fill" valve is off then you will loose too much pressure.
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