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8.1 Refrigerant charging The outdoor unit is factory-charged with sufficient refrigerant for the indoor unit and a specific pipe run. Refer to the manufacturer’s installation instructions for the pre-charge pipe length. Refrigerant will need to be totally removed and recharged where the pipe run length is longer than that allowed for in the factory. Where shorter, some refrigerant will need to be released and captured. It is an offence to release refrigerant to the air. Refrigerant charging must be carried out in accordance with AS/NZS 1677.2:1998, Section 6.1: Charging and discharging refrigerant. Procedure • Use on the specified refrigerant for charging. • Measure the additional pipe run length. • Accurately calculate the amount of refrigerant required according to the manufacturer’s instructions. • Measure the required amount of refrigerant (where additional charge is required) by mass, using electronic scales. • Keep the charge lines as short as possible. • Leak test the pipework before charging, by partially opening, then closing the cylinder valve to pressurise the connecting pipework. • Charge using liquid refrigerant from the cylinder. • Check for leaks using the bubble test solution. • Ensure that the cylinder and unit are at the same height to prevent gravity transfer of the refrigerant. Do not: • discharge refrigerant into the atmosphere – under AS/NZS 1677.2:1998, paragraph 6.1.2 Note 2, “it is an offence to deliberately discharge controlled ozone depleting substances into the atmosphere” with a $5,000 fine • use ultraviolet dye • use reclaimed refrigerant to add additional charge. 8.2 Labelling as record of service When a system is charged with refrigerant or lubricant, it must be labelled. Compressors, systems and liquid refrigerant pumps must be labelled in accordance with AS/NZS 1677.2:1998, clause 5.4.2: Marking of compressors, unit systems, and liquid refrigerant pumps. Place a permanent label on the unit that identifies: • refrigerant type • name of service person and organisation • date of service • lubricant type • gas charge (total including any additional charge). 46PDF Image | Heat pump installation Good Practice Guide
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