A Back to Back installation is deemed to be an installation where the indoor and outdoor units are installed on the same external wall with a maximum 3 meter run between the indoor unit and the compressor in a low-set home or building.
The Indoor Unitis installed on or against an external wall
The outdoor unit is installed on an existing flat and level surface
Maximum refrigerant pipe length between the Indoor unit and outdoor unit is 3 meters
Maximum drain length of 5m
Maximum power circuit length of 20m
Includes capping and isolating switch as per AU Standards