R32 Multi System - 2 to 5 Rooms
1. Overview
The Fujitsu R32 Multi System is a high-efficiency, inverter-driven air conditioning solution designed to operate multiple indoor units from a single outdoor unit.
The system is suitable for residential and light commercial applications where individual comfort control is required across multiple rooms, but installation space for several outdoor units is limited.
R32 refrigerant is used to support efficient system performance while offering a lower global warming potential than R410A.
| System item | Details |
|---|---|
| Outdoor models | AOTH36KBTA5 and AOTH45KBTA5 |
| Refrigerant | R32 |
| Application | Residential and light commercial |
| Indoor units | Two to five compatible indoor units, subject to model combination limits |
2. System Configuration
A single outdoor unit connects to multiple indoor units through a shared refrigerant circuit. Each indoor unit can generally be switched on or off independently and can have its own temperature and fan-speed setting.
| Wall Mounted | Cassette | Ducted Concealed | Floor Console |
| Configuration item | Typical capability |
|---|---|
| Connected indoor units | Two to five indoor units |
| Maximum diversity | Up to 130%, depending on the outdoor model and approved combination |
| Room control | Independent ON/OFF, set temperature and fan control |
| Shared requirement | All active indoor units must operate in a compatible system mode |
3. Key Features
Energy Efficiency
R32 refrigerant and inverter compressor technology allow the system to adjust output according to the combined indoor-unit demand. This reduces unnecessary compressor cycling and supports efficient part-load operation.
Independent Zoning
Each room can be operated independently, allowing occupants to condition only the spaces in use.
| Individual ON/OFF | Separate temperature settings | Independent fan-speed control | Room-specific timers |
Compact Outdoor Design
Using one outdoor unit for multiple rooms can reduce external wall congestion and provide a cleaner installation where space is restricted.
Quiet Operation
Optimised fan and compressor control are designed to reduce operating noise. Actual sound levels vary according to model, connected capacity, operating load and installation conditions.
Flexible Piping
The system supports flexible indoor-unit placement through extended piping allowances. Total piping length, branch arrangement and height differences must remain within the approved limits for the selected model combination.
Control Compatibility
Compatible indoor units may support wireless or wired controllers, depending on the indoor model. Optional Wi-Fi control may also be available through a compatible adapter and application.
4. Operating Modes
| Mode | Function | Typical use |
|---|---|---|
| Cool | Reduces room temperature. | Summer cooling |
| Heat | Provides reverse-cycle heating. | Winter heating |
| Dry | Reduces humidity with moderated cooling. | Humid conditions |
| Fan | Circulates air without compressor operation. | Air movement |
| Auto | Automatically selects heating or cooling according to room conditions. | General year-round operation |
5. Installation Considerations
| Requirement | Guidance |
|---|---|
| Approved combinations | Confirm indoor-unit capacities and quantity against the current combination table. |
| Refrigerant piping | Use the specified pipe sizes, branch components, flare procedures and additional-charge requirements. |
| R32 tools and components | Use equipment and components approved for R32 refrigerant. |
| Outdoor clearances | Maintain required airflow and service clearances around the outdoor unit. |
| Drainage | Provide correctly graded and insulated drain piping for each indoor unit where required. |
| Electrical supply | Follow the installation manual for supply, protection, interconnection wiring and isolator requirements. |
| Pressure testing and evacuation | Complete leak testing, evacuation and commissioning in accordance with the installation manual and relevant regulations. |
6. Maintenance and Service
| Maintenance item | Recommended action |
|---|---|
| Indoor filters | Inspect and clean every two to four weeks, depending on usage and environment. |
| Outdoor coil and airflow | Keep free from leaves, dust, vegetation and other obstructions. |
| Drain systems | Inspect for restrictions, leaks and adequate fall. |
| Refrigerant system | Investigate signs of oil, reduced capacity, icing or abnormal operating pressures. |
| Error history | Use compatible controllers and service functions to review stored faults and operating history. |
| Periodic service | Arrange regular professional servicing based on usage, environmental conditions and application. |
7. Advantages at a Glance
| ✔ Energy-efficient R32 refrigerant | ✔ Individual room comfort control |
| ✔ One outdoor unit for multiple rooms | ✔ Wide range of compatible indoor styles |
| ✔ Quiet inverter-driven operation | ✔ Optional smart-control capability |
