From inside (document excerpt):
MITSUBISHI I’-ELECTRIC + Split-type Air-Conditioner MXZ·4A80VA MXZ·5A100VA INSTALLATION MANUAL · Refer to the installation manual of each indoor unit for indoor unil stallation. in IMPORTANT NOTES TO COMPLY WITH THE REQUIREMENTS OF AUSTRALIAN STANDARD AS 3000 SAA. WIRING RULES, THE ELECTRICAL WIRING REQUIRED BETWEEN THE INDOOR AND OUTDOOR UNITS MUST BE INSTALLED BY A LICENCED ELECTRICAL CONTRACTOR.