As an HVAC contractor, you need to be equipped with the most comprehensive knowledge and tools to effectively execute the mini-split installation process. In this guide we’ll review the critical components of a successful installation, and review the pros and cons of some of the different options available.

Condenser Pads and Installation Brackets: The Foundation of Your Mini-Split System

Every GREE mini-split system comprises of an indoor air handler and an outdoor compressor unit. The outdoor unit can be installed on either a condenser pad or bracket, depending on the site condition and customer preference. Condenser pads are thick, heavy blocks specifically designed for placing condenser units on top of them, they provide excellent stability and are easy to install as they require no drilling into the home or commercial building.

However, in certain situations, installing an outdoor unit on a condenser pad might not be feasible. For instance, if there is no convenient location for the outdoor unit on the ground, or if the only available location would conflict with other building operations, like if it would be in the way of the snow plow or if it would need to take up a parking space in the building’s parking lot. In those cases it makes sense to mini-split installation brackets instead of condenser pads. Additionally, because brackets allow for mounting the unit off the ground, it provides a convenient way to safeguard the outdoor unit from potential flood damage or the impacts of heavy snowfall.

The advantages of condenser pads lie in their resistance to vibration, reduced sound transmission, and durability. Brackets, on the other hand, are favored for their versatility, space-saving aspect, and compatibility with uneven terrains. The choice between these two often comes down to the specifics of the installation site and the homeowner's preference. The contractor, in consultation with the homeowner, must consider these factors before choosing the best mounting method.

Refrigerant Line Sets: The Lifelines of the Mini-Split System

Refrigerant lines play a vital role in the operation of a mini-split system, acting as the conduits for heat transfer. These lines, composed of copper tubes and wiring, allow refrigerant to circulate between the indoor air handler and the compressor. This circulation is what enables the mini-split system to effectively transfer heat into and out of your client’s space. The length of these lines is typically determined by the distance from the compressor to the indoor units, taking into account any necessary detours or bends along the way. It's important to note that there are minimum and maximum lengths that must be adhered to, for GREE products you can find them in our Quick Reference Guide.

In addition to length considerations, these lines must be properly insulated to ensure optimal efficiency. Insulation helps to minimize energy loss and protect the lines from potential damage. Moreover, the line set connectors are sized according to the indoor unit port sizes. This ensures a proper fit and prevents leaks or inefficiencies in the system.

Mini-Split Sealants: Gum Type Sealant vs Spray Foam Sealant

Sealing the hole drilled for the refrigerant lines is a crucial part of an effective insulation. This step is vital as it prevents air leakage, which can reduce the efficiency of the HVAC system and increase energy costs. It also helps avoid moisture problems that could lead to mold growth and structural damage over time. Additionally, sealing acts as a deterrent to pests that might otherwise find their way into the home through small gaps. Finally, plays a role in maintaining the quality of indoor air by preventing outdoor pollutants from entering the home, and it can contribute to noise reduction by minimizing the transmission of noise from the outdoor unit into the home.

Gum type sealants are an excellent solution for sealing gaps between the hole’s perimeter and the refrigerant lines. It is flexible, durable, and easy to work with, making it a preferred choice for many installations.

However, for larger gaps or irregular spaces, a spray foam sealant can be more effective. It expands upon application to fill gaps, providing a robust insulating seal that can also deter pests. Both gum type and spray foam sealants have their unique advantages, and the selection often depends on the specific installation needs. In circumstances where spray foam sealant’s are required, aesthetics need to be considered, and you’ll need to determine with your client whether or not it is acceptable to have the sealant be visible or if it will need to be hidden behind an additional barrier or a protective fence for the condenser.

Line Set Adaptors: Bridging the Gap Between Outdoor & Indoor Units

In some instances, the indoor unit's line sets may not fit the outdoor compressor's port connection. In these cases you’ll need a line set adapter. These adaptors can help ensure a seamless installation process while maintaining the system's overall efficiency. It is important to thoroughly review the installation instructions for the indoor and outdoor units that you select with your clients prior to arriving for install so that you know if you’ll need a line set adaptor or not. You’ll want to plan ahead, though, by recognizing an incompatibility issue exists and choosing an adapter that fits both the compressor port at one end and the line sets at the other, and keep in mine that these adaptors are sized to the indoor unit port size.

Disconnect Switches: Safety and Compliance

Safety and compliance are paramount in mini-split installations, and in order to provide both you’ll likely need to include an AC quick disconnect switch. These stiches are required by many building codes in states across the country, and your client can get fined if they don’t have one. Quick disconnect switches are a metallic accessory shaped like a box that allow power to be cut from the system during maintenance or repairs, ensuring the safety of everyone involved. Property installation of these disconnect switches includes connecting them to a circuit breaker panel, so you’ll want to consider subcontracting this work to an electrician to make sure the switch is correctly set up and connected.

Value-Added Mini-Split Installation Accessories

While these mini-split accessories might not be required at every installation, we recommend having value-add accessories such as line set covers available to you in order to provide an outstanding installation experience and client satisfaction.

Surge Protectors: Safeguarding Your Client’s Investment

As a responsible HVAC contractor, it's important to educate your clients that like all electronic devices and appliances, mini-split systems are vulnerable to potential damage from power surges. A surge protector can help protect the mini-split system from voltage spikes, safeguarding the homeowner's investment. These protectors work by diverting the extra voltage into the ground, and preventing it from causing harm to the HVAC system.

Line Set Covers: Protecting the Lifeline

Line set covers are a helpful tool for maintaining the quality and aesthetics of the refrigerant lines. A line set cover provides additional protection from UV rays and weather elements while minimizing the visibility of the lines, and improving the home's exterior look. These may not always be necessary, however if your client is particular regarding the aesthetics of their home, or if these are lines are being installed in a class-a office building where first impressions are very valuable, line set covers may be critical for ensuring complete satisfaction from your client. If line set covers don’t seem necessary, but your client decides they would like them later, these covers can be installed later without disrupting the system's functioning.

Wifi-Enabled Thermostats

At GREE, we’ve stayed ahead of the curve by incorporating modern technology into our mini-split systems. Our wifi-enabled air handlers allow homeowners to manage their heating and cooling schedules seamlessly (verify that this is true.) However, for installations involving other brands, contractors can also consider adding an external wifi-enabled mini-split thermostat to bring the system up to speed.

By ensuring that you have these mini-split accessories at your disposal during the installation process, you'll be able to handle most mini-split installations with ease, guaranteeing optimal mini-split operation for your client. If you're collaborating with a client on an upcoming installation, we highly recommend using GREE's System Builder Tool, an intuitive platform that assists in selecting the GREE products that are most suitable for the space.

GREE is committed to empowering you with robust support resources. We offer a wide range of troubleshooting video content and answers to frequently asked questions to help you quickly resolve any issues you might encounter.

Remember, we always keep an ample stock of replacement parts on hand, making servicing your existing clients as seamless as an installation with the proper accessories. With GREE, you're not just investing in high-quality products, but also in a support system dedicated to ensuring your success in every project. Make the most of our resources today!