Building your own MRCOOL DIY multi-zone mini-split system is a smart way to ensure your home is comfortable year-round.
This guide will walk you through the process from planning to installation, helping you choose the right components and prepare for a successful setup. Let’s get started!
Step 1: Determine the Square Footage of the Area You Want to Heat & Cool
The first step in building your own multi-zone mini-split system is to measure the square footage of the spaces you want to heat and cool. This will help you decide how many air handlers and BTUs (British Thermal Units) you’ll need.
- Measure each room’s length and width**, then multiply these numbers to get the square footage of each space.
- Add up the total square footage** for all the rooms you plan to heat and cool.
Step 2: Decide the Number of Air Handlers Needed
Next, you need to decide how many air handlers (indoor units) you want for your system. Air handlers are the units that distribute heated or cooled air throughout your home.
- Consider each zone you want to control: Each room or area with a separate air handler can be controlled independently, allowing for customized comfort in different spaces.
- Choose the number of zones: You can have anywhere from 2 to 5 zones depending on your system size. For larger areas, you might need multiple air handlers to evenly distribute air.
Step 3: Choose the Type of Air Handlers
MRCOOL offers different styles of air handlers, so you’ll need to choose the type that best suits your home’s layout and aesthetic.
- Wall-Mounted Air Handlers: These are the most common and easiest to install. They are typically mounted high on a wall.
- Ceiling Cassettes: These are recessed into the ceiling, offering a low-profile look. They are ideal for rooms with limited wall space.
- Combination: You can mix and match wall-mounted units and ceiling cassettes depending on the specific needs of each zone.
Step 4: Determine the BTUs Required
Now, you need to figure out the total BTUs your system will require and how you want to distribute them across the air handlers.
- Calculate the BTUs needed for each room: Use an online BTU calculator or refer to the general guideline of 20 BTUs per square foot of space.
- Determine the air handler size: Based on your calculations, decide on the BTU capacity for each air handler. Spread out the total BTUs of the system to cover all zones effectively.
Step 5: Determine the Length of DIY Pre-Charged Line Sets
Each air handler will require a pre-charged line set to connect it to the outdoor condenser. The line set carries refrigerant between the air handler and the condenser.
- Measure the distance: from each air handler to where you plan to install the outdoor condenser.
- Choose the appropriate line set length: Line sets come in different lengths, so select the one that best fits your needs. Remember, you’ll need one line set for each air handler.
- PLEASE NOTE: Each air handler is powered by and communicates with the outside condenser via control wires. This control wire IS included and will match the pre-charged line set lengths for each zone.
Step 6: Plan the Outdoor Condenser Mounting
The outdoor condenser is the heart of your system, so it’s crucial to mount it securely.
Choose your mounting option
- Wall Mounting Brackets: Ideal for keeping the condenser off the ground and away from debris.
- Mounting Pads: Composite pads that rest on the ground. You can use an existing concrete pad, pour a new one, or use a composite pad.
**Ensure the condenser is level and stable** to prevent any operational issues.
Step 7: Arrange Electrical Connections
Powering your outdoor condenser requires an electrical connection from your home’s breaker box.
Plan the electrical setup: This may involve running wiring from your breaker box to the condenser.
Consider adding electrical wire whips and disconnect boxes
These are available as add-ons when purchasing your system.
**Note:** The electrical components are not included in the kit due to the variety of installation scenarios. You may need to consult a licensed electrician if you’re not comfortable with electrical work.
Step 8: Gather Necessary Tools and Accessories
Before you start the installation, make sure you have all the necessary tools and accessories.
**Common hand tools**: Screwdrivers, wrenches, and a level are typically needed.
**MRCOOL Tool Kit**: Available as an add-on, this kit contains everything you need for a smooth installation.
Step 9: Assemble and Install Your System
With all your components and tools ready, you can begin assembling and installing your MRCOOL DIY mini-split system.
**Follow the detailed installation instructions** provided in the kit.
**Connect the air handlers to the outdoor condenser** using the pre-charged line sets and control cables.
Step 10: Enjoy Your New Climate-Controlled Spaces
Once your system is installed, you can enjoy efficient heating and cooling in every zone of your home.
Final Thoughts and Support
Building your own MRCOOL DIY multi-zone mini-split system is a rewarding project that can save you money and provide customized comfort for your home. If you need any assistance during the process, don’t hesitate to contact us at MRCOOL DIY Direct. We’re here to help you build the perfect system and ensure you have everything you need to complete your project successfully the first time.
Happy building!
