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The units are delivered precharged with refrigerant for the condenser coil and the evaporator. Charging of the field installed piping is required. Refer to the refrigerant charge table for the proper amount to be added for the applications interconect piping. Unit service valves are solid brass, for sweat connections. IMPORTANT: All systems require field charge adjustments. Refer to the "Refrig- erant Charge Tables" for proper weight charge and to the supplied “Field Charging Charts" for proper