Do-It-Yourself Mini Split Air Conditioners have become very popular since they are a good alternative to a high cost HVAC installations.
They come with most everything needed except tools and electrical wiring to a panel.
There are many units available from small 9000 BTU units to large 36000 BTU units.
Pioneer is one such popular DIY Mini Split manufacture with several different sized units.
I recently installed a Pioneer 12000 BTU 230 Volt unit which I thought I would share how I install a mini split.
A video is also posted at the bottom of the page of the install.
Here is the unit I bought on Amazon
PIONEER Air Conditioner Inverter+ Ductless Wall Mount Mini Split System Air Conditioner & Heat Pump Full Set, 12000 BTU 230V
The unit will come with lots of information such as user manual and installation instructions.
Be sure To follow the Installation manual that comes with your unit.
There is some tools that will be needed such as a Vacuum Pump and Manifold Gauges.
There are many low cost vacuum pumps and gauges which I bought some budget ones for the install.
Here is the Vacuum Pump I bought on Amazon
ZENY 3,5CFM Single-Stage 5 Pa Rotary Vane Economy Vacuum Pump 3 CFM 1/4HP Air Conditioner Refrigerant HVAC Air tool R410a 1/4″ Flare Inlet Port, Blue
Budget 410a Manifold Gauges on Amazon
ZENY Diagnostic A/C Manifold Gauge Set R22 R134a R410a Refrigeration Kit Brass Auto Serivice Kit 4FT w/Case, 1/4″ SAE Fittings
Some other basic tools will also be needed such as a Drill, Screw drivers, and wrenches.
Most Mini Split systems will need a 5/16″ Female Coupler to 1/4″ Male Flare to connect the manifold gauges to the unit.
Here is one on Amazon
Wadoy R410a Adapter for Mini Split HVAC System 5/16″ Female Quick Couplers x 1/4″ Male Flare
A 3 inch hole saw bit is also needed to drill a hole for the line set and wiring to go between the units.
How To Install Pioneer 12000 BTU 230 Volts Ductless Mini Split
1… The first step is to layout were the unit will be located and run the electrical.
Always follow the manual that comes with your unit for the wire Gauge and breaker Amps.
The unit I received needed to be on a 20 AMP breaker which can be run to an electrical panel or on its own box.
Most HVAC companies will install a disconnect box which simply breaks the flow of electricity when work is needed on the unit.
Personally I install a 20 AMP breaker close to the unit but this is a personal preference as long as it is on a 20 AMP breaker at the panel.
I used 10 Gauge wire to run to the unit.
2… A pad will be needed to set the outside unit onto. The unit needs a flat solid surface that is level to sit on.
If the outside location already has concrete it can simply be set on it.
If there is no pad one can be bought or a small cement pad can be poured.
Small pads are low-cost items that can be purchased and what I use for example this one on Amazon.
Mini Split Pad on Amazon
Ideal Air 728184 2 x 16 x 36″ Cement Equipment Pad
Which ever way a pad is setup be sure it is level and set the outside unit on top of it.
3… Next the inside unit will need to be mounted onto a wall.
There is a few things that need to be done before it can be mounted.
First the mounting bracket will need to be screwed onto the wall and level.
The mounting bracket is on the back of the inside unit held in place with a Philips screw.
Be sure to mount the bracket on a good stud so the unit is secure.
A hole will need to be drilled to run the line-set and wires to the outside unit.
Look at the back of the unit for were the line-set and wiring stick out for were the hole will need to be drilled.
The instructions will also show the location and size of the hole needed through the wall.
I used a 3 inch hole saw to drill an opening for the refrigerant line and wiring to go to the outside unit.
4… Hook the wiring harness to the inside unit which is labeled 1,2,3 and ground.
Be sure to follow the schematics in the manual and on the inside door for your unit.
The connectors are located under the front panel under a pull out on the right side.
The wire harness will need to be fed in from the back.
One problem I had was the wire color codes was not exactly the same as the wiring harness sent to me.
This is not much of a problem as the inside and outside unit are labeled 1-2-3 and ground. If this happens simply be sure the wire color match inside and out. For example Red would be connected to the connector labeled 1 inside and outside.
5… Feed the line set and wiring out the hole and set the unit on the mounting bracket.
The wires, line set, and drain line all need to be fed out the 3 inch hole and the unit mounted on the wall bracket.
Be sure to be careful with the copper line set as it cannot be kinked or will block the flow of refrigerant.
There is a plastic protector that slides into the hole and protects the wiring and copper line if needed.
6… Next the copper line set needs to be screwed together.
The main thing when installing the line set it to not kink the copper and screw it together carefully as to not strip the bolt threads.
This is easy enough, simply take your time by rolling out the copper line-set and hand tightening the connections before using a wrench.
Screw the nuts on by hand carefully making sure not to strip the threads. Once hand tight use a wrench to tighten them up and get a good seal.
7… Hook up the wiring harness to the outside unit.
Again follow the schematic that come with the unit.
Be sure the connectors labeled 1-2-3 and ground match the inside wall unit.
The L1 and L2 go the the breaker for power.
8… Once everything is installed the line set will need to be vacuumed out with a Vacuum pump.
Using manifold gauges and a pump hook up to the low side port. It is the only service port on the unit.
Let the vacuum pump run for 15-20 minutes pulling a vacuum. After 15-20 minutes turn off the vacuum pump and watch the manifold gauges pressure.
For example here it is hooked to the Red Gauge and the pressure is negative with the dial under the zero marker.
It should hold a negative pressure if not there is a leak that needs to be fixed.
Let it sit for at least 20-30 minutes or more and be sure it holds a negative pressure.
9… Release the refrigerant into the system.
Once the line set has been tested for any leaks and has a vacuum the refrigerant can be released.
Both the high and low side will need to be released. This is done by removing the caps and using an Allen key turning them to the left.
They will need a few turns for the valve to come fully open.
10… Once refrigerant is in the system and power on the unit is ready to be tested.
Power on the unit using the remote control. The right side shows the temperature when the unit is turned on.
Installing the Pioneer Ductless Mini Split was not that difficult and falls into a handy person Do-it-yourself category.
Of course if you have never done any basic construction or electrical wiring be sure to call a professional.
If you decide to install a unit yourself be sure to read the instructions 2-3 times before starting.
Plan the install over a 1-2 day period and take your time. While it can be installed quickly it is best to go slow.
Every install will be a bit different since electrical box locations, walls and other things can change a layout.