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proper way to bleed air

vtan
vtan Member Posts: 1
edited October 31 in THE MAIN WALL

What is the proper way to bleed air from a system? I have follow the videos on youtube. First shut off the system. Connect hose to the return side before the pump. Open the zone valve. Open the valve where the hose is connected. When the valve is open 1/4 of the way, I see a lot of air bubbles coming out, however when it is open full blast, there aren't any air bubbles. What is the proper way to bleed?

Thank you so much for your help.

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