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How to Install a Mini Split: A Comprehensive Guide for DIY and Professional Installation

CEO Khai Intela
Introduction: Installing a mini split system can seem like a daunting task, whether you're a professional contractor or a handy homeowner. But fear not! In this article, we will guide you through the process of...

Introduction: Installing a mini split system can seem like a daunting task, whether you're a professional contractor or a handy homeowner. But fear not! In this article, we will guide you through the process of installing a ductless mini split system, offering tips for optimal placement and sharing insights for both DIY enthusiasts and professional contractors.

DIY vs Professional Installation

One of the most common questions we receive is whether it's possible to install a mini split system yourself. The answer is a resounding yes! DIY installation is not only achievable but can also save you money in the process. Mini split systems are highly energy-efficient compared to traditional central heat and air systems, leading to long-term cost savings.

To ensure a smooth installation process, there are some key factors to consider. By keeping these details in mind, you'll make your mini split installation a breeze.

How to Install a Mini Split in 3 Steps

Installing a mini split system can be broken down into three parts:

  1. Install the indoor unit
  2. Install the outdoor unit
  3. Connect the refrigerant piping from the indoor unit to the outdoor unit

Before you begin the installation process, it's essential to have the necessary tools and parts on hand. Here's a list of what you'll need:

Tools & Parts for DIY/Professional Mini Split Installation

  • Mounting plate
  • Clip anchors
  • Seal
  • Drain joint
  • Wall sleeve
  • Nitrogen Tank
  • Drill
  • Hole Saw
  • Torque Wrenches
  • Vacuum Pump
  • Flare Tool
  • Tube Cutter
  • Screwdriver
  • Allen Wrenches
  • Spray-on Leak Detector
  • Adjustable Wrench
  • Digital Refrigerant Scale
  • R410a Manifold Gauges
  • Tape Measure
  • Line sets

Please note that line sets are included in a DIY mini split package.

Step-by-Step Guide for Mini Split Installation

1. Install the mounting bracket

  • Find a section of the wall that is free from wires, pipes, and ducts.
  • Mark the stud locations and ensure the space behind can be safely drilled.
  • Fasten the screws and mount the bracket securely.

2. Make a pilot hole Image of MRCOOL DIY Mini Split

  • Drill the hole from the inside to the outside.
  • Point the drill slightly downwards while drilling to ensure proper drainage.
  • Check outside for any obstructions before proceeding.

3. Drill the actual hole How to Install a Mini Split: DIY and Professional Installation Guide

  • Use a hole saw to bore the hole from the inside to the outside.
  • Pause drilling when you reach the wall cavity to inspect for possible obstructions.
  • Once the path is clear, complete the hole by drilling from the outside.

4. Run the AC line set How to Install a Mini Split: DIY and Professional Installation Guide

  • Unpack the mini split line set and uncoil it from the evaporator.
  • Feed the line through the hole from the inside to the outside.
  • Have someone outside to assist in pulling and guiding the line.
  • Bend the line set down to the condenser, ensuring the plastic collar at the end stays in place.
  • Run the drain last and connect the necessary extension, securing it with electrical tape.
  • Cover the line set section within the hole with a foam sleeve and replace the insulation in the wall cavity.

5. Install the evaporator

  • Place the evaporator on the mounting bracket, ensuring a snug fit with no play.

6. Install the condenser

  • Ensure the line set can easily reach the condenser without obstructions.
  • For electrical installation, refer to our dedicated wiring specifications guide.
  • Mount the condenser on the wall or a suitable supporting pad.
  • Check the minimum clearances according to the manual.
  • Ensure the placement area is free from obstructions that could hinder operation.

7. Connect the refrigerant lines How to Install a Mini Split: DIY and Professional Installation Guide

  • Consult your manual for specific instructions on connecting the refrigerant lines.
  • DIY lines utilize a locking mechanism for secure connections.
  • Ensure the lines have sufficient length without strain or obstructions.
  • Check for kinks or sharp bends that can impede the flow.
  • Power up the system to test the connection.

8. Cover the line set How to Install a Mini Split: DIY and Professional Installation Guide

  • Once you've verified the proper functioning of the mini split, cover the connections.
  • Seal the hole from the outside.
  • Use protective plastic covering or a metal channel to cover the line set.
  • Secure the plastic or metal channel to the wall with self-tapping screws.
  • Test the protective covers for any play or looseness, ensuring a secure fit.

Buying a Mini Split

When purchasing a mini split, it's important to choose the right one for your needs. We offer various options for both DIY installations and professional contractors. Our MRCOOL DIY mini splits are specifically designed for easy installation and come with everything you need, eliminating the need for last-minute trips to the hardware store. For contractors, we have mini splits from renowned brands like LG, Daikin, and Panasonic. Use our Air Conditioner BTU Calculator to determine the ideal model for your requirements.

How to Install a Mini Split: DIY and Professional Installation Guide The MRCOOL DIY mini split system is easy to install and requires no special tools.

In Over Your Head? Contact Us for Guidance

If you're unsure about installing a mini split system yourself, we recommend hiring a reputable HVAC professional who can assist you. If you need any guidance or have any questions related to mini splits, feel free to reach out to us. We're here to help!

Remember, installing a mini split system is not as complicated as it may seem. With the right tools, parts, and guidance, you can enjoy the benefits of efficient cooling and heating in your home or commercial space. Happy installing!

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