Refrigerant Recovery and Recharge

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Here is a detailed process for recovery after a failed heat pump charge attempt. This is a specific case where after refrigerent was released from outdoor unit into the indoor unit, there was a leak, and service valves were shut. The starting point was that of most refrigerant remaining in the outdoor unit, and whatever refrigerant was released leaked into the air because there was a leak in the system. In the initial attempt, we did not do a pressure test, as the vacuum held and we assumed that was enough - which it wasn't. [1]