Reverse cycle ducted central AC system maintenance

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My house a YORK reverse cycle ducted central AC system. The outdoor unit is a MOH 55 B35, the inside unit a YAH 016 and the controller a HAN-L6. I have no handbook or maintenance instructions for the indoor & outdoor units, what maintenance is required for them other than cleaning of the central ceiling intake filter (can this filter element be replaced) please? Also does the refrigerant need to recharged regularly? Thanks Biko


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