Tools and Materials
Knowing how to install a mini split can help you set a comfortable indoor environment. You will need the following tools and materials for split AC installation.
Tools and Materials
How to Install a Mini Split System
You can install a mini split without extensive ductwork. They are a perfect choice for homes and spaces where HVAC systems may not be practical.
Decide the wall on which you will install a mini split. It is best to select a perimeter or exterior wall. This allows an easier connection between the indoor and outdoor units.
Mini split AC installation is best when it is mounted on studs. Refer to your home layout to locate the studs on the chosen wall. Next, place the mounting bracket on these studs. Make installation markings on these studs with a pencil.
The mini split must be at least six inches below your ceiling. The mini split must also have an open area of about six inches on both sides. Use a measuring tape and pencil to mark the place on your wall.
Always install a mini split away from electronic objects and direct sunlight. They can hamper the temperature reading on the mini split.
Remove the mounting bracket from the indoor unit. Place it on the wall markings. Use a vial level or digital level to straighten its placement. Use a pencil to mark the screw hole locations on the wall. Then, use a drilling machine to make pilot holes.
Use self-tapping screws with anchors to mount the bracket. In some cases, it's not possible to find any studs where you wish to install a mini split. Use drywall hollow anchors in such a situation. Make sure to confirm that the anchors are suitable to sustain the weight of your mini split.
Wear safety glasses while operating a drilling machine.
The mini split might not drain properly if installed incorrectly. Always use a level to ensure proper alignment from the very start of the installation process.
Locate where to make a hole for the wires and pipes. It must be near the wall bracket at the lower left or lower right corner. Use a drill machine to make a hole big enough to take these pipes and wires outside.
Use a hole saw drill for this step. Drill the hole at a downward angle to ensure proper drainage.
Wear safety gloves and safety goggles while using a drill machine.
Place your indoor unit on a table. Turn it over to access the pipes behind. You will see a drain tube and refrigerant piping.
Refer to the instruction manual to confirm the various ways you can place them. Figure out the best position of the pipes as per your room layout.
You might need to change the location of the drain pipe to suit your room’s layout. You can do so by placing the pipe on the alternative opening.
Turn the indoor unit again to access its front. Open the service hatch and unscrew it with a screwdriver. Then, unscrew the locking tabs from behind. You will be able to take the cover off. Access the drain connection and remove the drain hose. It will create a drain hose opening.
Then, locate the rubber drain plug placed near the refrigerant piping. Remove it from its original place. Then, plug it into the drain hose opening. Now, plug the removed drain hose into the alternative position. Fasten the retaining clip to secure the connection.
Locate the wiring cover and open it. Unscrew the wiring clip placed inside. Locate the inlet hole at the back of the mini split.
Push the multi-conductor wire through this hole. Pull it a few inches out from the front. Leave the wire as it is to make connections later.
Take hold of the refrigerant pipe and straighten it carefully. Hold this pipe, drain tube and the multi-conductor wire you just installed. Bundle these three together with an electrical tape.
Be careful when pushing the wires through the inlet hole. Damaged wires can lead to electrical issues or shorts.
Lift the indoor unit and place it on the mounting unit. Either get help from someone or use installation support brackets to hold it in place.
Push the bundled wires and pipes through the wall hole. Adjust and secure the indoor unit on the wall mount bracket. Make sure the wires and pipes are completely through the wall.
Hold the multi-conductor wire and adjust the wire stripper on one of the wires. Squeeze the handles and pull to strip the wire cladding.
Expose a few inches of wire in this manner for all the wires. Now, refer to the instruction manual and connect these wires using a screwdriver. Place the wiring clip and close the wiring cover. Then screw back the service hatch. This completes the indoor unit installation.
Double check with the instruction manual to confirm that you have connected the wires correctly.
Before installing the outdoor unit, refer to your local code. Then, choose a location based on the codes and your home’s layout. You can mount it on the rooftop.
However, the easiest way is to place it on the floor. Place a condenser pad at the final location. Put the outdoor unit on the pad and secure it with bolts.
Use a ladder to access the wire and pipe bundle through the wall hole. Take hold of the refrigerant pipe and locate the plug. Hold the pipe with a wrench and turn the plug with your hands to unscrew it. The harmless pressurized nitrogen gas will release with a hissing sound.
Now, bring the copper cables included in the mini split installation kit. Take the flared copper end of the copper wire and connect it to the refrigerant pipe. Hold the pipe with an adjustable wrench and tighten the copper cable with a torque wrench.
Copper cables can break if you apply too much pressure. Handle them gently and tighten the cables with caution so as not to break them.
Wear proper clothes and shoes to avoid slipping while working on a ladder.
Take hold of the drainage pipe coming out from the wall hole. Connect the push-fit drainage pipe to it. Secure the connection with plumbing tape.
Carefully bend all the pipes and wires to align them with the wall. You can also use a cover tubing kit to hide the pipes and wires. It will also protect them from wearing out due to harsh weather conditions.
Bending the copper pipes forcefully can break them. Always bend them slowly and gently.
Locate the panel covering the refrigerant valves and wiring on the outdoor unit. Unscrew this panel with a screwdriver. Connect the other end of the copper tubing to this valve. Use a torque wrench to secure the connection.
Now, connect the multi-conductor wire to the outdoor unit. Make the connections according to the color coding in the instruction manual.
Some mini splits come with pre-evacuated pipes. Others require to be evacuated with a vacuum pump. Refer to the manual for details about your mini split. You can hire a professional for this task.
Next, the outdoor unit must be connected to an AC disconnect. This will be further connected to a circuit breaker box. It’s best to let a trained professional carry out this process. Call a licensed electrician to install the circuit breaker and make a high-voltage connection to the mini split.
Once the electrician makes all the connections, you can turn on the mini split. Check for any noise, excess vibrations or leakage. In case of any of these issues, check the installation again and make necessary adjustments. Once complete, you can enjoy cool air within your room.