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How do you add freon to a home air conditioner with r22?

The air-conditioning system needs to be turned on. ... The AC unit's R-22 refrigerant valves have caps on them. Attach the R-22 gauge's left-hand hose to the valve on the large refrigerant pipe. Attach the R-22 gauge's right-hand hose to the valve on the small refrigerant pipe.

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