LG KUMXB181A Multi F Outdoor Condenser Unit with 18000 BTU Cooling Capacity, 22000 BTU Heating Capacity and Gold Fin Protection in White

LG's devotion to providing efficient ductless solutions can be seen across the Multi F line of outdoor condensers. The KUMXB181A is a dual zone mini split outdoor condenser capable of supplying ductless heating and cooling to two rooms in your home. With inverter technology and nearly two dozen compatible indoor units in a variety of styles, the unit  is a great choice for nearly any applications.

• Energy Star Certified
• AHRI Certified
• Inverter Technology
• Gold Fin Protection

Enhanced Connectivity

LG's new R-32 mini split units require a 5-conductor cable (Not Included) instead of the standard 4-conductor, improving communication reliability and enabling a new leak detection feature.

Low Ambient Operations

This outdoor unit supports cooling operations down to 14 degrees Fahrenheit and heating operations down to -4 degrees Fahrenheit. There is also a defrost feature, which removes frost from the condenser coil in frigid conditions.

Quiet Design

Thanks to a brushless direct current motor and a twin rotary compressor, the unit is significantly quieter than traditional air conditioning systems. These components reduce mechanical sound, electrical sound, and vibrations within the unit.

*Note Indoor Units Required to Operate

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Why Buy LG KUMXB181A Multi F Outdoor Condenser Unit

• Energy Efficiency: The inverter-driven compressor actively adjusts its speed to maintain precise temperature control, reducing energy consumption by up to 30% compared to non-inverter systems. This intelligent regulation minimizes energy waste and maximizes system performance.
• Durable Construction: Engineered with Gold Fin Protection, the heat exchanger resists corrosion in harsh environments, extending the unit’s service life by up to 40% over standard finishes.
• Wide Operating Temperature Range: Performs reliably in extreme conditions, delivering heating in temperatures as low as -4°F and cooling in environments up to 14°F, ensuring year-round comfort.
• Multi-Zone Functionality: Supports dual-zone climate control, allowing two separate indoor units to independently heat or cool different areas, enhancing comfort and efficiency across multiple rooms.
• Advanced Refrigerant: Utilizes R-32 refrigerant, which delivers higher energy efficiency and has a 67% lower Global Warming Potential (GWP) than traditional R-410A, supporting greener HVAC solutions.
• Enhanced Connectivity: Incorporates a 5-conductor communication cable that ensures stable system performance and enables built-in leak detection, improving reliability and early fault identification.

• Quiet Operation: Operates quietly minimizing outdoor noise and contributing to a more peaceful indoor and outdoor environment.

Frequently Asked Questions

Q: What is the LG KUMXB181A?

A: The LG KUMXB181A is a Multi F outdoor condenser (heat pump) designed for ductless mini-split systems. It supports multiple indoor units to provide efficient heating and cooling to separate zones.

• Supports up to two indoor units in a multi-zone setup
• Functions as the outdoor component in a ductless HVAC system
• Provides both heating and cooling via heat pump technology

Q: What are the key features of the KUMXB181A?

A: This outdoor unit is built for energy efficiency, quiet operation, and year-round performance in various weather conditions.

• Multi-zone capability: Connects with up to two compatible indoor units
• Inverter technology: Uses a variable-speed compressor and electronic expansion valve for energy efficiency and consistent performance
• Quiet operation: Equipped with a twin rotary compressor and a BLDC motor to minimize noise and vibration
• Corrosion-resistant design: Features LG's Gold Fin coating on the heat exchanger for enhanced durability
• Low ambient performance: Operates in cooling mode down to 14°F, Operates in heating mode down to -4°F
• Defrost feature: Automatically removes frost buildup from the outdoor coil during cold weather

Q: What accessories are required to install the KUMXB181A?

A: Several essential components must be purchased separately to complete the installation.

• Line set: Double-insulated copper tubing for refrigerant lines
• Drain tubing: For proper condensate removal
• Disconnect box & whip kit: For electrical safety and code compliance
• 5-conductor connecting wire (14 AWG): For communication between indoor and outdoor units
• Mounting solution: Either a plastic condenser pad or a wall bracket for outdoor unit placement

Q: What are the wiring requirements for the unit?

A: The unit requires a specific power and communication wiring setup to operate correctly.

• Voltage: 208–230V, 60Hz, single-phase power supply
• Requires a 5-conductor cable between indoor and outdoor units
• Cable must be stranded, and may be shielded or unshielded

• If using shielded cable, the shielding should be grounded at the outdoor unit chassis only

Pros and Cons of LG KUMXB181A Multi F Outdoor Condenser Unit

Pros

• Energy efficient: It features advanced inverter technology with a variable speed compressor and electronic expansion valve, reducing energy consumption while maintaining consistent, accurate temperatures.
• Multi-zone capability: This unit supports connection to two indoor units, providing heating and cooling for two separate zones or rooms.
• Quiet operation: Designed for low noise, it includes a brushless direct current motor and a twin rotary compressor that minimize noise and vibration, with a sound level rated at 54 dB.
• Durable construction: The heat exchanger is coated with Gold Fin to resist corrosion and extend the unit’s lifespan.
• Low-ambient operation: It can operate efficiently in low temperatures, supporting heating down to -4°F and cooling to 14°F, suitable for a variety of climates.
• Enhanced connectivity: Utilizes a 5-conductor cable for more reliable communication and features built-in leak detection.
• Smart features: Equipped with built-in Wi-Fi, allowing control via the LG ThinQ app on smart devices.
• Wide range of indoor unit options: Compatible with nearly two dozen indoor unit styles—including wall-mounted, ceiling cassette, and concealed duct—offering flexible system design.

Cons

• Confusing installation instructions: Some users find the included installation instructions, particularly around the pipe detection process, unclear and difficult to follow.
• Accessories not included: Essential components such as line sets, drain tubing, electrical wiring, and mounting pads or brackets are sold separately.
• Base pan heater not included: Although the unit supports low-ambient heating, a base pan heater must be purchased separately for optimal cold-weather performance.
• Requires professional installation: Due to installation complexity, specialized wiring, and refrigerant handling, professional installation is necessary, increasing overall cost and making it unsuitable for DIY.

Conclusion

The LG KUMXB181A is a highly efficient and versatile multi-zone mini-split system, delivering excellent performance, quiet operation, and compatibility with a wide variety of indoor units. Its inverter technology, durable build, and low-ambient capability make it an ideal choice for zoned heating and cooling. However, confusing installation instructions and missing essential accessories pose challenges, and professional installation is required. Homeowners seeking a plug-and-play solution should consider other options, but those with a trusted HVAC professional will find the KUMXB181A to be a reliable, high-performance system for two-zone applications.