How do I vent the pump after installation?
Set the pump to speed III using the button on the operating panel, then let the pump run for a minimum of 30 minutes. How fast the pump is vented depends on the system size and design. Small air pockets may cause noise initially, but because the pump is self-venting through the system, the noise will cease over time. (Page 7)
From the official Grundfos Ups3 15 50 65 manual, page 7
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