Professional Installation of a mini split

Mount the evaporator inside the room on an exterior wall away from direct sunlight, doorways and sources of dust.
Make sure this area of the wall is free of wires, pipes and ducts that would interfere with making a hole for the line set.
Mark the stud locations and fasten the bracket to them with screws.

The line set hole must slope slightly downward to the outside so condensate from the evaporator can drain outside.
Begin by drilling a pilot hole from inside to outside.
Then go outside and make sure no trim or other obstructions will complicate drilling the full-size hole.

Cut with a hole saw from inside, move aside any insulation and inspect the wall cavity for obstructions.
Finish the hole by drilling from the outside.

Carefully uncoil the line set from the back of the evaporator.
With an assistant outside, feed the line set through the hole.
As it emerges, the assistant should gently bend the line set downward and to the side as needed to reach the condenser.
The drain line is shorter and goes through last, below the other lines.
Add the drain extension and wrap the joint with electrical tape to keep it secure.

Wrap the foam sleeve around the section of line set within the hole and replace any insulation cavity that was disturbed.
Then hang the evaporator on the mounting bracket.
- Pro tip: Your helper may need to feed a few more inches of the line set outside as you do this.
On the outside, make certain to remove any rough edges from damaging the line set.

Set the condenser on a pad on the ground or mount it on a wall bracket so that the refrigerant lines can reach it easily.
Route the line set so it stays tight to the building exterior and doesn’t leapfrog any obstructions. This makes it easier to install a cover.
Ensure the condenser has the recommended clearance from walls and bushes.
Avoid placement where water accumulates or where other appliances vent.
A location on the east or north side of the structure maximizes cooling efficiency.

Connect both the Return or Suction Line and the Liquid Line using a torque wrench and torque to specification, note lines have flared end that fit over beveled brass attachment, it is critical that the flare lines up before tightening the connection
Before powering up, test the system with pressure and evacuate all non condensable gases before releasing the Freon gas

Before powering up, inspect the refrigerant lines for kinks and verify the electrical connections.
Mini Splits run at very high pressure, as much as 500 PSI (when in heat mode) a Nitrogen test can get pressurize the lineset with nitrogen. I usually also go up to around 250 psi but always check your install instructions to make sure they don't recommend using less pressure just in case. then get your soap bubbles and soak each mechanical fitting then let the pressure sit and see if it falls.
Evacuate the system Hook the HVAC Gauges Blue hose to Low-Pressure Port on the outside condensing unit. (Usually the only port on the unit.)
Hook Center Yellow Hose to the Vacuum Pump.
Turn On the vacuum pump and open the valve on the HVAC Gauges Low Pressure Side (Blue).
Let the pump run until the system goes into a Vacuum, negative pressure.
Let the pump run for at least 15-20 minutes or more, turn the gauge Blue valve shut, and then turn the vacuum pump off.
Let the unit sit for some time 20-30 minutes or more and be sure the vacuum holds.
If it holds the vacuum there are no leaks, and refrigerant can be released into the system.
Using an Allen Key, let the refrigerant into the system. Open both the high and low-pressure valves on the outside condenser. Open them all the way out, which will take several turns. Let the pump run until the system goes into a Vacuum, negative pressure.
Then go inside and set the temperature using the handheld controller.

Insulate and seal the hole in the outside wall, then cover the line set using sections of plastic or metal channel cut to length.
Place the back half of the channel behind the line set, plumb it and anchor it to the wall with self-tapping screws.
Our line set travels horizontally to the compressor, so when we added the channel corner, we drilled a hole in it to allow the drain line to exit straight down.

A mini-split system has two main components: an indoor evaporator, which cools the air, and an outdoor condenser, which dissipates heat.
They’re connected by a line set, tubing that passes through a baseball-size hole in the wall, carrying hot refrigerant outside and cold refrigerant in.
A line set also includes a cable to power the evaporator and a drain line to carry condensation outside.