MrCool Subassemblies

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MRCOOL Subassemblies for HVAC Systems

Welcome to the South Mini Splits collection for MRCOOL Subassemblies for HVAC Systems. As the "brain" of your HVAC system, these boards manage the primary logic, timing, and safety protocols required for peak performance. We provide high-quality, authentic replacement components and sophisticated control subassemblies to keep your inverter-driven systems running efficiently. Our extensive inventory ensures compatibility across various Carrier-compatible, Midea-manufactured, and ACiQ platforms.

Whether you are maintaining a standard 6,000 BTU wall-mount or a high-capacity ACIQ 120,000 BTU Gas Furnace, we have the precision-engineered parts necessary for routine repairs or complex system overhauls.

💡 Why Choose South Mini Splits for Your MrCool Subassemblies?

  • ✅Wholesale Pricing: Competitive rates on critical electronic components, including the Electronic Control Box Assembly (17222000033256)..
  • ✅USA-Based Support: Expert technical assistance to help you identify the exact board for your model, such as the Main Control Board Sub-assemblies (17122000018658).
  • ✅Free Shipping Over $300: Get your vital replacement parts, from PCB boards to a Heavy Duty Mini Split Ground Stand, delivered fast to minimize downtime.

What are Sub-assemblies?

Modern inverter systems utilize a complex ecosystem of boards working in tandem. Proper installation often requires more than just the board; ensure your outdoor unit is protected with a Return Air Package or stabilized on a Packaged Unit Roof Curb where applicable.

Our sub-assemblies support a wide range of systems, from single-zone floor consoles to multi-zone configurations using MRCOOL multi-zone accessories.

Indoor & Outdoor Logic

Indoor Main Boards: We carry logic boards ranging from the Main Control Board Sub-assembly (17122000045295) for 9,000 BTU wall units to the Main Control Board Sub-assembly(17123000004052) for high-capacity systems like the 60,000 BTU concealed ductplatforms.

Outdoor Main Boards: Our inventory includes crucial components like the Outdoor Main Control Board Subassembly (17122000050360) and the Outdoor Main Control Board Sub-assembly (17122000055262).

Specialized Modules & Interface

Inverter Precision: Parts like the Inverter Module Subassembly (17122000055348) convert power to the variable frequency needed for DC inverter compressors.

Display & Interface: We stock the Midea Display Board Subassembly (17122700000267) and Terminal Block Subassemblies to ensure your system communicates effectively.

Technical Facts & Performance Advantages

Multi-Zone Capability: We stock specialized boards to manage multiple indoor heads from a single outdoor condenser, ensuring balanced refrigerant flow across all zones, from 18,000 BTU to 48,000 BTU units.

Voltage Specificity: We offer boards tested for varied power requirements, including 230V and 115V configurations, essential for systems integrated with ACIQ Communicating Gas Furnaces.

Heating Integration: Our PCB assemblies work seamlessly with auxiliary heating components like ACIQ 15 Kilowatt Electric Heater Coil or MrCool Signature Series Heat Kits.

Mini Split BTU Sizing & Application Guide

Use our quick reference chart to match your room size with the ideal system capacity.

Capacity Sq. Footage Application
6,000 BTU150–250Small bedrooms & offices
9,000 BTU250–450Standard bedrooms
12,000 BTU450–600Kitchens & studios
18,000 BTU600–1,000Living rooms & garages
24,000 BTU1,000–1,200Open floor plans
36,000 BTU1,500–1,700Commercial & fitness
48,000 BTU1,900–2,100Large warehouses
60,000 BTU2,400–2,800+Commercial estates

When to "Size Up"

High Ceilings (10ft+)

If your ceilings are 10 feet or higher, you are cooling a larger volume of air. We recommend increasing your BTU choice by 20%.

Poor Insulation

For older homes or buildings with single-pane windows, opt for the next size up to ensure the unit can maintain the set temperature.

Kitchen Environments

Appliances generate significant heat. If the unit is for a kitchen, add 4,000 BTUs to your square footage calculation.

Heavy Sun Exposure

Rooms with large south-facing windows or "sunrooms" act like greenhouses. Increase your BTU capacity by 10-15%

Occupancy

If the area regularly hosts more than two people (like a conference room or classroom), add 600 BTUs per additional person..

Need Help Sizing?

If you aren't sure which unit is right for your project, use our BTU Calculator or contact our USA-based support team for a custom recommendation.

Open BTU Calculator

Frequently Asked Questions

A: Yes. A multi-zone system requires a more complex electronic control box subassembly to manage multiple expansion valves and communication lines compared to a one-zone wall mount setup. If you are servicing a multi-zone wall mount unit, ensure the sub-assembly matches the specific port logic of your outdoor condenser.

A: Absolutely. The outdoor main control board subassembly controls the four-way valve responsible for switching between cooling and heating modes. If your heat pump systems aren't providing warmth, the logic board may not be sending the signal to the valve or the heat strips.

A: Yes, with the industry shift in refrigerants, r454b products and r454b single zone systems utilize specific control logic boards calibrated for the pressure and temperature curves of the new refrigerant. Always verify the refrigerant type on your unit's data plate before ordering a main control board subassembly.

A: We do. We stock parts for everything from single-zone floor consoles and multi-zone floor consoles to the more complex concealed duct and universal floor ceilings units. Each of these requires a specific display board subassembly or terminal board subassembly to function correctly.

A: Many of our sub-assemblies are compatible with MRCOOL, ACiQ, OLMO, and ARMBRIDGE. We also carry dedicated parts for Mitsubishi and Cooper&Hunter. Whether you are fixing a small 24,000 BTU residential system or a large 42,000 BTU light commercial unit, we likely have the board you need.