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FF there should be a fast fill on your bioler, it is hard to describe it has a square base maybe 3" x3" square and on the top is a lever that you can lift this will add water but you do not want your pressure to go up higher than 20 psi your PRV will pee off the overpressure, you need to make sure your zones are open when you add water one at a time however make sure the power is off you will smoke the zone valves by manually opening them with power on, this is also how your purge your system of air just add a hose and let the air and water run in one side out the other
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