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I have a gas boiler with 2 zones, 2 circulator pumps and 2 relays. See attached diagram
When I bleed the system this is what I basically do. I turn all the shut-off valves off, except for line going out to the baseboards of the zone I am going to bleed, disengage the fill valve pressure regulator and then I open the drain petcock above the circulator pump and let it run for about a minute or two and then repeat for the second zone. However, when I do the above the tridicator gauge shows 0 psi pressure.
Is the way I am bleeding the system correct?