I have a few tips. The real solution is to plumb in a TEE on the outlet where one outlet goes to a ball valve and the other goes to a hose barb to the CFC. That will allow you to open up an air vent for priming.
Without doing that, you can lower the pump below the kettle outlet and the CFC and orient the outlet of the pump UP so the air can rise into the CFC. It takes about 2 minutes for the bubbles to work out. I plan to try putting an air purge valve in from Home Depot meant for getting air out of hydronic heating systems.
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