MRCOOL DIY® 5th Gen 24,000 BTU Multi-Zone Mini Split Air Handler 230V, DIY-24-HP-WMAH-230D25-O

The 5th generation DIY systems from MRCOOL feature several key improvements over the 4th generation, including:

1. Refrigerant Change: The refrigerant has been upgraded from R410-A to R454-B, which is more environmentally friendly and energy-efficient compared to the previous refrigerant.
2. Performance Enhancements: We’ve made various performance improvements to enhance the efficiency and overall operation of the systems.
3. Expanded DIY Multi Condensers: The DIY Multi condensers now come with additional ports, ranging from 3 to 6, allowing for greater flexibility in multi-zone setups.
4. New Product Offerings: We’ve introduced new 6k BTU air handlers and cassette units to provide more options for different space sizes and installation preferences.

These updates reflect our commitment to providing cutting-edge, easy-to-install HVAC solutions that meet both performance and environmental standards.

For a full breakdown, check out our blog.

We do not recommend shortening the communication cable for your MRCOOL MiniSplit system. Shortening the cable can lead to several potential issues, including performance problems, signal errors, and difficulties with the system’s operation.

The communication cable is designed to provide the correct signals between the air handler and the condenser unit. If shortened improperly, it can cause signal interference or loss of communication, resulting in operational errors, reduced efficiency, or system failure.

Additionally, shortening the communication cable may void your warranty if not done correctly, as it could be considered improper installation or modification. To avoid these risks, we suggest using the cable lengths provided or consulting with a licensed technician for assistance in ensuring the installation is done properly.

If you have any concerns or need more detailed guidance, feel free to contact our customer support team. We're happy to help!

No, the 4th generation DIY Mini Splits are designed to use R-410A refrigerant. None of our R-410A products are compatible with R-454B products due to the changes made to support the new refrigerant. Additionally, R-410A and R-454B refrigerants should never be mixed, as they are not compatible with each other. Always use the recommended refrigerant for your specific system to ensure optimal performance and safety.

If you're installing a 5th Generation MRCOOL® Mini-Split and are looking for the Wi-Fi port to connect the included dongle, here's what you need to know.

The Wi-Fi port is located inside the indoor air handler, behind a small internal cover panel. To access it:

1. Open the front cover of the indoor air handler.
2. Look directly underneath for a small plastic panel—this is typically secured with a screw.
3. Remove the screw and gently lift the panel to expose the Wi-Fi port.
4. You will see the Wi-Fi port clearly marked.
5. Insert the included Wi-Fi dongle into the port.
6. Re-secure the cover and close the front panel.

🔧 Tip: This process is demonstrated in our full installation video, which includes locating and installing the Wi-Fi dongle: ▶️ Watch Installation Video on YouTube

Excess line sets in your MRCOOL system do not need to be placed directly behind the condenser. They can be positioned in various locations - behind the unit, mid-run, or elsewhere - depending on your installation setup. However, if the line set is coiled at an elevation higher than the condenser, make sure to coil it horizontally, not vertically, to avoid the formation of oil traps that can affect system performance.

Proper lineset placement and coiling are key to ensuring smooth operation. For further guidance, refer to your installation manual or contact support.

If your MRCOOL system requires longer condensation drain hoses, you can extend them using compatible hoses available at most hardware stores. Ensure the extension matches the original hose diameter (typically 5/8-inch or 16mm) to maintain proper drainage. Secure the connection with a tight seal to prevent leaks and support the extended length to avoid sagging or blockages.

The MRCOOL 5th Generation DIY Mini-Split systems offer the following warranty coverage:

• Limited Lifetime Compressor Warranty: This warranty provides coverage for the compressor for the lifetime of the unit for the original registered owner. To qualify, the unit must be registered within 60 days of installation, and the owner must enroll in the MRCOOL Care Program within 4 months of installation.
• 7-Year Compressor Replacement Warranty: This warranty ensures that if the compressor fails within the first seven years, MRCOOL will provide a replacement.
• 5-Year Parts Warranty: This warranty covers all parts of the system for five years from the date of purchase.
  
  To activate these warranties, it's essential to register your product promptly after installation. This ensures you receive the full benefits of the warranty coverage.
  
  Additionally, regular maintenance is crucial to keep your warranty valid. Enrolling in the MRCOOL® Protection Program can help maintain your system's longevity by providing DIY cleaning kits and filters biannually.

View Warranty Document here.