The LG UHS1125SPLSET is a high static reverse cycle splittable ducted air conditioning system designed for larger homes, offices, and commercial spaces that require long duct runs, strong airflow, and flexible installation. Its splittable design allows the indoor unit to be separated into sections, making it easier to transport and install in tight roof spaces and restricted access areas. It includes the indoor UHN125M3S unit, outdoor UU125WR3L unit, and PREMTB101 wired wall controller. With 12.5kW cooling and 15.0kW heating capacity, this model is ideal for large open-plan homes, offices, multi-room properties, and spaces around 55–90m² depending on insulation and layout. The system can modulate from 5.1kW to 14.3kW in cooling mode and from 6.0kW to 16.2kW in heating mode, helping maintain stable temperatures while reducing energy use.

Key Features & Benefits

Splittable Indoor Unit Design

The indoor unit is designed in a splittable configuration, making it easier to transport through roof spaces, narrow hallways, and tight access points before being assembled on site. This can simplify installation in homes and commercial spaces where a standard one-piece indoor unit may not fit.

High Static Pressure Performance

The system supports external static pressure from 49Pa to 157Pa, making it suitable for long duct runs, multiple outlets, and larger zoned ducted systems. Airflow ranges from approximately 425 litres per second up to 1,035 litres per second, helping maintain strong and even air distribution throughout the property.

3-Phase Power Supply

This model operates on 380–415V 3-phase power, making it suitable for larger homes and commercial properties with 3-phase electrical supply. Rated current is approximately 5.1 amps in cooling mode and 5.7 amps in heating mode, with a full load current of approximately 14 amps.

Energy Efficient Inverter Scroll Compressor

The system uses an inverter scroll compressor with a BLDC motor to provide smoother temperature control, quieter operation, and lower running costs than fixed-speed systems. It delivers an AEER of approximately 3.68 and an ACOP of approximately 3.95.

Compact Indoor Unit Design

The indoor unit measures approximately 1250mm wide, 360mm high, and 820mm deep, while the outdoor unit measures approximately 950mm wide, 1380mm high, and 330mm deep. Despite its large capacity, the system remains compact enough for many residential and commercial roof spaces.

Quiet Operation

Indoor sound levels are approximately 44dBA on high fan speed, 42dBA on medium, and 41dBA on low fan speed. Outdoor sound pressure levels are approximately 51dBA in cooling mode and 52dBA in heating mode.

Long Pipe Run Capability

The system supports refrigerant pipe runs from 5 metres up to 85 metres, with a maximum height difference of 30 metres between indoor and outdoor units. This provides installers with greater flexibility for larger homes and more complex layouts.

Wide Operating Range

The unit can operate in outdoor temperatures from -15°C to 48°C in cooling mode and from -18°C to 18°C in heating mode, making it suitable for Australian climate conditions year-round.

R32 Refrigerant

The system uses modern R32 refrigerant for improved efficiency and lower environmental impact compared to older refrigerants. Refrigerant piping uses a 3/8-inch liquid line and 5/8-inch gas line.

Optional Wi-Fi and Zone Control Compatibility

The system is compatible with optional Wi-Fi control and can be integrated into zoned ducted systems for improved comfort and energy savings throughout the property.

PREMTB101 Controller Included

This system includes the LG PREMTB101 wired wall controller for simple temperature adjustment, operating mode selection, timer functions, and day-to-day system management.

Ideal Applications

• Large homes
• Open-plan living areas
• Multi-room homes
• Offices
• Commercial spaces
• Homes with long duct runs
• Zoned ducted systems
• Properties with difficult roof access

Why Choose the LG UHS1125SPLSET?

The LG UHS1125SPLSET is a powerful and flexible ducted solution designed for larger homes and commercial spaces that require strong airflow, high static pressure, and easier installation in restricted spaces. With its splittable indoor unit, 3-phase power supply, inverter scroll compressor, optional Wi-Fi control, and strong 12.5kW cooling capacity, it is an excellent option for demanding ducted installations.