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Direct answer
What must generally happen before service opens a charged appliance's sealed refrigerant circuit is a TradeCert Prep study concept connected to EPA 608 Practice Test prep, not a copied official exam item. Proper recovery precedes opening a charged sealed circuit so avoidable refrigerant release is prevented. Always verify licensing, certification, and testing rules with the current official candidate bulletin, state manual, code book, or testing provider before relying on a detail for compliance.
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