The Daikin FDYA180AV1 / RZAS180DY1 is a premium reverse cycle ducted system designed for large homes, multi-storey properties, open-plan living areas, and commercial spaces with 3-phase power available. As part of Daikin’s Premium Inverter range, it delivers stronger energy efficiency, quieter operation, and greater installation flexibility than the standard FDYQN series while remaining concealed within the ceiling space. With 18.0kW cooling and 20.0kW heating capacity, this model is ideal for large homes, 5-bedroom properties, offices, and areas around 100–150m² depending on insulation and layout. The inverter compressor can modulate output from 9.0kW up to 20.0kW in cooling mode and from 10.0kW up to 22.4kW in heating mode, helping maintain stable indoor temperatures and reduce running costs.

Key Features & Benefits

Premium Inverter Technology

Daikin’s Premium Inverter range uses advanced refrigerant control, a high-efficiency DC fan motor, and a hermetically sealed scroll compressor to deliver smoother temperature control, quieter performance, and stronger seasonal efficiency than standard ducted systems.

R32 Refrigerant

Unlike older 18kW systems that use R410A, the FDYA180AV1 / RZAS180DY1 uses modern R32 refrigerant for improved efficiency and lower environmental impact. Daikin introduced the 18kW Premium R32 series specifically for greater seasonal performance and compliance with current Australian standards.

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. It helps spread electrical demand more evenly across circuits compared to large single-phase systems.

Strong Airflow Performance

The unit provides rated airflow of approximately 1160 litres per second, helping deliver even conditioned air across multiple rooms and larger open-plan spaces. Indoor sound levels are approximately 42.1dBA in both cooling and heating modes, helping maintain quieter operation for a system of this size.

Compact Indoor Unit Design

Despite its large capacity, the indoor unit remains compact for easier installation in modern homes. Indoor dimensions are approximately 470mm high, 1200mm wide, and 997mm deep. The side-discharge outdoor unit is approximately 1430mm high, 940mm wide, and 320mm deep, helping maximise installation flexibility where side access is limited.

Long Pipe Run Capability

The Premium series supports refrigerant pipe lengths up to 50 metres, giving installers greater flexibility for larger homes, multi-storey properties, and more complex ducted layouts.

Night Quiet Mode

Daikin’s Night Quiet Mode automatically reduces outdoor operating noise during sleeping hours and resumes normal operation in the morning, helping minimise disturbance to occupants and neighbours.

Wide Operating Range

The system can operate in cooling mode from -5°C to 50°C outdoor temperature and in heating mode from -15°C to 16°C outdoor temperature, making it suitable for year-round Australian conditions.

R22 Retrofit Capability

This model supports R22 retrofit applications, allowing existing pipework to often be reused when replacing older systems. This can help reduce installation time and overall project cost.

Optional Refrigerant Leak Detection

Daikin offers an optional refrigerant leak detector sensor for installations where refrigerant concentration limits must comply with AS/NZS60335:2:40 requirements. When activated, the system can automatically stop the compressor and switch to fan-only mode for added safety.

Wired Controller Compatibility

The system is commonly paired with Daikin’s BRC1E63 wired wall controller, with optional zoning controllers also available for larger homes and commercial installations.

5-Year Manufacturer Warranty

Daikin ducted systems are backed by a 5-year manufacturer warranty for residential applications when professionally installed and maintained.

Ideal Applications

• 5-bedroom homes
• Multi-storey properties
• Open-plan living areas
• Large family homes
• Offices
• Commercial spaces with 3-phase power

Why Choose the Daikin 18kW Premium Inverter Ducted System?