Best way to get air out of H/W heat system?

QUESTION:

Just a matter of curiosity. This was a couple years ago.
We had a new pump installed on our hot water boiler. I wasn't home at the time. When I did get home it was nice and warm downstairs but no heat upstairs. I figured there must be air in the upstairs zone but didn't know what to do about it. There are no bleeder valves anywhere in the house. I had checked that out a long time before. I like to know how things work.
So here's what I did. I shut off the downstairs heat (turned the thermostat down) and water started through the upstairs zone, but now there is a lot of air going through. I opened the overflow tank and drained it completely and then air was coming out. When water began to come out again I closed it.
I had to repeat this operation several times before things quieted down to the point where I was happy with it. It took a few hours.
A few weeks ago they had to come and replace the upstairs zone valve (totally unrelated) and I know they had to get the air out again. I wasn't home at the time (again) but my wife said the guy was out of here in about 1 1/2 hours. Everything was fine.
So obviously there must be an easier way to do it than what I did. Any clues for me?

ANSWER:

Yes fine way to do it.
Find a bleeder valve in the main line somewhere on top of boiler or so. OPen it a little and open the waterinlet valve too. AS water has air all the water that is coming in new contains air and has to bleed. The second guy will have tried to minimize losses.
Greetings from polleke in duketown holland


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