How to Install a Mini Split AC System?

A mini split air conditioner unit comprises an indoor air handler and an outdoor compressor connected by refrigerant lines, wiring, and a drain pipe. To install a mini split AC system, you must mount both units and connect them properly to ensure uninterrupted cooling. Below, I have shared detailed instructions on how to install a mini split AC system.

How to Install a Mini Split AC Unit?

• Select the right location.

Begin by identifying appropriate locations for both units. The indoor unit should be installed high on a wall with proper ventilation and away from heat sources. The outdoor unit requires a stable, well-ventilated space with adequate clearance.

• Mount the indoor AC unit.

Using screws and a levelling tool, securely attach the mounting plate to the wall. Then, drill approximately a 2 to 3-inch hole through the wall at a slight downward angle to accommodate pipes and wiring. Finally, hang the indoor unit from the bracket.

• Now, you can mount the outdoor AC unit.

Put the outdoor condenser on a wall bracket or concrete pad. Make sure it is level and placed such that ventilation and noise won't be a problem.

• Connect the refrigerant lines and wiring.

You can now pass the drain hose, electrical cables, and refrigerant pipes through the opening in the wall. Connecting them between the indoor and outdoor units should be done carefully to prevent leaks or severe bends.

• Vacuum, test, and power on the AC.

Check for leaks, finish electrical connections, and hoover the system to get rid of moisture and air. Finally, turn on the system after testing to guarantee optimal cooling performance.

From my experience, I recommend hiring an AC technician for proper mini split AC installation.

Here’s how to install a mini split AC system;

1. Select the right mini split AC according to the room dimensions. A 1 ton unit is appropriate for areas up to 120 sq ft, a 1.5 ton unit accommodates 120 to 180 sq ft, and a 2 ton unit is suitable for bigger spaces. Choosing the appropriate capacity guarantees effective cooling and avoids overloading.

2. Install the indoor unit on a sturdy wall, 7 to 8 feet from the ground. Make sure that air flows freely throughout the room and refrain from positioning it directly over beds or sofas. 

3. Secure the mounting plate by properly fastening it with wall plugs and screws. Use a bubble level to ensure it is entirely aligned. An inclined surface may lead to ineffective drainage and water seepage.

4. Drill a 2.5 to 3 inch hole with an angle sloping towards the exterior. This opening contains refrigerant lines, electrical cables, and the drainage pipe. The incline aids in the smooth drainage of water condensation.

5. Position the outdoor condenser on a level area, balcony flooring, or wall mounting bracket. Make sure there is adequate airflow and avoid exposing it to direct sunlight and rain whenever possible. Ensure adequate space for heat release.

6. Link copper refrigerant pipes between indoor and outdoor units. Secure flare nuts correctly and insulate the pipes to prevent energy loss. Link the connecting wires according to the wiring schematic.

7. Attach the drain pipe firmly and make sure there is a consistent downward incline. This stops water from backflowing and leaking within the room.

8. Use a vacuum pump to extract air and humidity from the system. Conduct a pressure and leak test to confirm there are no refrigerant leaks.

9. Switch on the mini split AC and check cooling performance, airflow, noise, and drainage. Ensure stable operation before regular use.

Professional installation is recommended to ensure safe electrical connections, correct gas charging, and long-term performance of your mini split AC system.

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