Mini Split air conditioners are very popular since they are very efficient to run, can both heat and cool, and can be installed by Do-It-Yourself individuals.
There are many kits available that can be bought online and come in different sizes.
Senville is one such manufacturer of Mini Split heat pumps and has 9000, 12000, 18000, and 24000 BTU units available.
I installed a Senville 9000 BTU 230 Volt unit with how I installed it below.
A video is also posted at the bottom of the page of the installation.
Senville DIY Mini Split Kit on Amazon
Senville AURA Series Mini Split Air Conditioner Energy Star Cold-Climate Heat Pump, 12000 BTU, Compatible with Alexa, White
Below is how I installed a Senville Mini Split. Be sure to follow the instructions that come with any unit bought. If in doubt, be sure to call a professional.
There are some tools that will be needed, such as a Vacuum Pump and Manifold Gauges.
There are many low-cost vacuum pumps and gauges, and I bought some budget ones to do the installation.
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
Example 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, Screwdrivers, 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.
Example 5/16″ Female Coupler to 1/4″ Male Flare Adapter on Amazon
PIONEER Air Conditioner Ductless Mini Split System charging vacuum port adapter, Converts new R410a style 5/16 SAE service ports to accept older 1/4 SAE gauge hoses.
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 Senville Ductless Mini Split
- The first step is to lay out where the unit will be located and run the electrical.
- A pad for the outside condensing unit to sit on needs to be set up. The unit needs a flat solid surface that is level to sit on.
- Next, the inside unit will need to be mounted onto the wall.
- Hook the wiring harness to the inside unit, which is labeled 1, 2, 3, and ground.
- Feed the line set and wiring out of the hole and set the unit on the mounting bracket.
- Next, the copper line-set needs to be screwed together.
- Hook up the wiring harness to the outside unit.
Again follow the schematic that comes with the unit.
Be sure the connectors labeled 1-2-3 and ground match the inside wall unit.
The L1 and L2 go to the breaker for power. This unit used 240 volts on L1 and L2.
- Once everything is installed, the line-set will need to be vacuumed out with a vacuum pump.
- Release the refrigerant into the system.
- Once the refrigerant is in the system and powered attached, the unit is ready to be tested.
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.
I added in a 20 AMP breaker at the main panel and installed a disconnect box which simply breaks the flow of electricity when work is needed on the unit.
The unit I received used 12 Gauge wire.
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 also be purchased, and what I used.
Mini Split Pad on Amazon
DiversiTech UC1636-3 36 Inch Wide Equipment Pad for Mini Split Condensers
When the pad is set up, be sure it is level and set the outside unit on top of it.
A few things need to be done before it can be mounted.
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 where the line-set and wiring stick out for the location of the hole needing to be drilled.
The instructions will also have a template to show the location and size of the hole 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.
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 were not exactly the same as the wiring harness sent to me.
This is not much of a problem as the inside, and outside units 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.
Be sure to be careful with the copper line-set as it cannot be kinked or will block the flow of refrigerant.
Everything will stick out the hole from the inside unit.
For this install, the line-set was run inside the wall. Most installs will have to go on the outside and install a mini split cover kit to hide it.
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 bolts together carefully, making sure not to strip the threads. Once hand tight, use a wrench to tighten them up and get a good seal.
Let the vacuum pump run for 20-30 minutes, pulling a vacuum. After 15-20 minutes, turn off the vacuum pump and watch the manifold gauge pressure.
For example, here, it is hooked to the Blue 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.
Both the high and low sides will need to be released. This is done by removing the caps and using an Allen key, turning them counter-clockwise to the left.
They will need a few turns for the valve to come fully open and have a stop when all the way out.
Installing the Senville Ductless mini split was not that difficult and fell 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 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.
This install took me roughly 5 hours, but I have installed many units before.
Every install will be a bit different since the electrical box locations, walls, and other things can change a layout.