Melbourne basement split system placement is not about choosing a neat spot on the wall. It is about keeping the indoor unit, the condensate drain path, and the electrical connections above the flood level that a heavy Melbourne downpour can push into a below-grade room. Generic installs fail because the unit is mounted too low or the condensate line is run flat, and 200 mm of standing water backs up into the drain before the room has even dried out. Raise the indoor unit and extend the drain line correctly, and the system keeps cooling while the floor is still wet.
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Melbourne Basement Split System Placement Rules
If you are putting a split system in a Melbourne basement, the placement rules are simple. Keep every part that carries water or power above the highest likely water line. For rooms that have taken 200 mm of water in previous wet seasons, that means the bottom of the indoor unit should sit at least 500 mm above the finished floor. This gives roughly 300 mm of clearance above a 200 mm flood line, enough to avoid splashing and floating debris. A high-wall indoor unit does this naturally when it is mounted near the ceiling. A floor console does not, and it is the wrong choice for any basement with a flood history.
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- Use a high-wall indoor unit, not a floor console.
- Set the bottom of the unit no lower than 500 mm above the floor.
- Keep the electrical isolator and wiring entry above the same line.
- Route the drain so it cannot be submerged at its discharge point.
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Why Basement Drains Back Up
Condensate lines rely on gravity. The indoor unit produces water in cooling mode, and that water has to leave the room through a small drain hose. In a standard Melbourne installation, the hose runs down the wall and into a floor waste, outside, or into a condensate pump. When a basement takes 200 mm of water, the floor waste is usually the first thing to stop draining. Stormwater backs up through the grate and into
