Variable speed Scroll Air-CooledModular Units—FAQ

Yes. Aurashu’s variable speed scroll air-cooled modular units are highly customizable and are specifically designed to meet the diverse requirements of different projects, climates, building types, and operating conditions. Unlike standardized HVAC equipment with fixed configurations, Aurashu adopts a project-oriented engineering approach, allowing each modular unit system to be tailored from the early design stage through production, commissioning, and lifecycle support.From a capacity and modular configuration perspective, Aurashu can customize the number of modules, single-module capacity, redundancy ratio (N+1 or higher), and system layout according to building load profiles. Whether the project is a small commercial building, a phased industrial expansion, or a large public facility with future growth plans, modular capacity can be precisely matched to actual demand, avoiding oversizing and improving part-load efficiency.In terms of climate adaptability, Aurashu offers customized solutions for high-ambient, low-ambient, high-humidity, coastal corrosion, desert dust, and cold-region heating applications. Options include enhanced condenser coils, anti-corrosion coatings, low-temperature heat pump optimization, reinforced defrost logic, and fan or compressor selections optimized for extreme environments. This ensures stable and reliable operation in different global regions.Aurashu also provides custom control and integration options. Modular units can be equipped with intelligent master-slave control, adaptive load distribution, and cloud-enabled remote monitoring. Control protocols such as BACnet, Modbus, and LonWorks are available, enabling seamless integration with BMS, EMS, or smart building platforms. For projects with strict operational requirements, customized logic—such as priority zones, staged start-up, or peak-shaving strategies—can be implemented.From a system design and installation standpoint, Aurashu can adapt piping connections, electrical configurations, noise control solutions, footprint dimensions, and structural reinforcement to suit rooftop, ground-mounted, or restricted-space installations. This flexibility significantly reduces on-site construction complexity and shortens project timelines.Beyond equipment customization, Aurashu delivers complete project-level solutions, including load calculation support, system selection guidance, BIM models, technical documentation, commissioning assistance, operator training, and long-term service planning. This end-to-end capability ensures that each customized modular unit system performs as expected throughout its lifecycle.In summary, Aurashu’s customization capability transforms modular chillers from standardized products into engineered HVAC solutions, helping customers achieve optimal energy efficiency, reliability, and investment value tailored to their specific projects.

In Aurashu variable speed scroll air-cooled modular units, system reliability is one of the core design priorities. If one module fails, the system is engineered to continue operating safely and efficiently without complete shutdown, ensuring uninterrupted cooling or heating for critical applications.Each Aurashu modular unit operates as an independent refrigeration module, equipped with its own inverter-driven scroll compressor, electronic expansion valve, control board, and protection system. When multiple modules are combined, they are connected through Aurashu’s intelligent master–slave control architecture, allowing real-time communication and coordinated operation.If a module experiences a fault—such as abnormal pressure, electrical protection activation, or compressor malfunction—the system responds in several layers:1. Automatic fault isolationThe faulty module is immediately isolated from the system. Refrigerant circuits and electrical components of the affected module are shut down independently, preventing fault propagation to other modules.2. Continuous operation of remaining modulesAll healthy modules continue operating normally. The master controller dynamically redistributes the load among available modules, ensuring stable chilled water or hot water output. This design avoids total system downtime, which is critical for hospitals, data centers, commercial buildings, and industrial processes.3. Intelligent capacity compensationAurashu’s variable-speed technology allows remaining modules to automatically adjust compressor speed to partially compensate for lost capacity. While total output may be reduced depending on system redundancy, the system maintains the highest possible efficiency under the new operating condition.4. Real-time alarm and diagnosticsThe control system provides clear fault codes and operational status via the local controller or BMS interface (BACnet/Modbus optional). Maintenance teams can quickly identify the failed module without affecting the rest of the system.5. Easy maintenance and fast recoveryBecause modules are standardized and independent, service technicians can repair or replace the faulty module without shutting down the entire system. Once restored, the module can be reintegrated seamlessly, and the system automatically resumes optimized load sharing.6. Designed redundancy for high-demand applicationsAurashu modular systems are often configured with N+1 or multi-module redundancy. This ensures that even during a module failure, critical cooling or heating demands are still met within acceptable limits.In summary, a single module failure does not compromise system stability or safety. Aurashu’s modular philosophy transforms traditional chiller systems from single-point-failure risks into highly reliable, flexible, and service-friendly solutions, making them ideal for projects that demand continuous operation and long-term reliability.

Aurashu variable speed scroll air-cooled modular units adopt an advanced intelligent modular control architecture that allows multiple independent modules to operate as a highly coordinated, unified cooling and heating system. Each module is equipped with its own controller, sensors, and inverter-driven scroll compressor, while a centralized master controller or Building Management System (BMS) oversees overall system operation.Master–Slave Intelligent ControlWhen several Aurashu modular units are connected, one module automatically acts as the master controller, while others function as slave modules. The master unit communicates with all connected modules via an industrial-grade communication protocol (such as Modbus or BACnet), ensuring real-time data exchange on temperature, pressure, load demand, operating status, and fault conditions. This structure guarantees stable coordination without relying on a single point of failure.Dynamic Load Sharing & Staging ControlAurashu’s control logic continuously analyzes system load requirements. Based on real-time demand, the system automatically:Starts or stops modules in sequenceAdjusts inverter compressor speedsBalances operating hours among modulesThis intelligent staging ensures that the system always runs in the most energy-efficient configuration, especially under partial-load conditions. Instead of running all units at low efficiency, only the required number of modules operate, each at its optimal load range.Redundancy & High ReliabilityThanks to the modular control strategy, the system maintains high operational reliability. If one module experiences a fault or requires maintenance, it is automatically isolated while the remaining modules continue operating. This redundancy is particularly valuable for hospitals, data centers, commercial complexes, and industrial facilities where uninterrupted cooling or heating is critical.Integrated Variable Speed ControlEach Aurashu module features variable speed scroll compressors, allowing precise capacity modulation. The central controller coordinates compressor frequencies across modules, preventing frequent on/off cycling, reducing mechanical stress, and extending component lifespan while achieving stable indoor temperature control.Centralized Monitoring & Remote ManagementAurashu modular systems support seamless integration with BMS platforms, enabling centralized monitoring, scheduling, alarm management, and energy analysis. Optional remote monitoring solutions allow facility managers and Aurashu technical teams to access system performance data, conduct diagnostics, and optimize operation remotely—reducing downtime and service costs.Scalability & Future ExpansionThe modular control system is designed for flexibility. Additional modules can be easily added later without complex reprogramming. The master controller automatically recognizes new units and incorporates them into the control logic, making Aurashu modular chillers ideal for projects with phased expansion plans.Optimized Comfort & Energy PerformanceBy combining intelligent communication, load prediction algorithms, and inverter technology, Aurashu ensures precise temperature control, lower energy consumption, reduced noise levels, and improved overall system efficiency—helping customers meet sustainability goals and reduce lifecycle costs.

Variable speed technology significantly enhances the energy efficiency of a variable-speed scroll air-cooled modular unit by allowing the system to precisely match cooling or heating output to the actual load demand at any given moment. Unlike traditional fixed-speed compressors that operate only in fully ON or OFF states, a variable-speed compressor automatically adjusts its speed (RPM) through inverter control, providing only the required capacity. This eliminates frequent start-stop cycles, which are among the largest sources of energy waste in conventional chillers.At part-load conditions—which account for more than 80% of typical annual operation—the compressor can run at reduced speed, lowering power consumption dramatically while maintaining stable indoor temperature and high operating efficiency. Variable-speed systems also optimize evaporating and condensing temperatures under different ambient conditions, further reducing energy use compared to fixed-speed units.In addition, the variable-speed fans and pumps within the modular unit adjust their airflow and water flow based on real-time demand. By coordinating compressor capacity, fan airflow, and system pressure, the unit achieves precise load matching and minimizes unnecessary energy expenditure. This coordinated control improves integrated part load value (IPLV) and seasonal energy efficiency ratio (SEER), leading to substantial reductions in annual operating costs.Variable-speed technology also enhances comfort and system stability. Because the compressor ramps up and down smoothly rather than switching on and off, temperature fluctuations are minimized, noise levels are reduced, and mechanical wear is lowered. This extends the service life of the unit and reduces long-term maintenance needs.Overall, variable-speed technology improves energy efficiency through load-matching operation, reduced cycling, optimized heat exchange performance, part-load efficiency improvements, intelligent control integration, and smoother system operation. These features make variable-speed scroll air-cooled modular units particularly suitable for applications requiring high efficiency, stable output, and long-term energy savings.

Yes. Most variable-speed scroll air-cooled modular units are designed as air-source heat pump systems, meaning they support both cooling and heating. Equipped with inverter-driven variable-speed scroll compressors, the unit can smoothly switch operating modes and precisely adjust capacity according to load demands. This allows stable heating performance in transitional seasons as well as in colder climates, depending on the model’s low-ambient capabilities.In heating mode, the unit extracts heat from outdoor air and transfers it indoors through the refrigerant cycle. Thanks to variable-speed technology, the system can modulate compressor speed, refrigerant flow, and electronic expansion valve opening to maintain stable outlet water temperature. This leads to higher heating efficiency (COP), improved comfort, and reduced energy consumption compared to fixed-speed systems.Many models also include enhanced vapor injection (EVI) technology or low-temperature heating kits, allowing the unit to maintain effective heating even at low outdoor temperatures. Multiple modules can operate together, providing system redundancy and ensuring reliable heating even if one module is offline. Meanwhile, intelligent networked controls balance the heating load among modules, extending compressor life and improving overall system stability.Because heating and cooling share the same modular platform, installation is simpler, piping requirements are reduced, and capacity can be expanded later by adding modules. This makes the system well suited for hotels, office buildings, shopping centers, industrial facilities, and any application that requires efficient year-round temperature control.In summary, the variable-speed scroll air-cooled modular unit does support heating, functioning as a high-efficiency heat pump with precise modulation, reliable low-temperature performance, and flexible modular scalability.

Variable-speed scroll air-cooled modular units typically use high-efficiency variable-speed scroll compressors as their core refrigeration component. These compressors are designed to adjust their speed continuously according to real-time cooling demand, allowing the system to deliver precise capacity modulation and excellent partial-load performance. Unlike fixed-speed compressors, which operate only at full capacity or shut down, variable-speed scroll compressors can operate across a wide frequency range, significantly reducing energy consumption and improving temperature stability.The scroll design itself offers several advantages: fewer moving parts, smooth and quiet operation, low vibration, and high reliability. These benefits make scroll compressors particularly suitable for modular systems, where multiple modules run in parallel and stable performance is essential. Depending on the model, the unit may use inverter-driven DC scroll compressors, enhanced vapor injection (EVI) scroll compressors, or tandem/multi-scroll configurations to further improve capacity, efficiency, and low-ambient performance.The compressor’s variable-speed capability also enhances system redundancy and load distribution. When multiple modules are combined, each compressor can intelligently modulate according to system requirements, ensuring balanced operation and extending overall service life. This allows the modular unit to deliver high efficiency across a wide operating range, making it suitable for commercial buildings, industrial facilities, data centers, and applications requiring stable temperature control.In summary, the variable-speed scroll air-cooled modular unit relies on inverter-driven variable-speed scroll compressors to deliver flexible capacity, high efficiency, reliable performance, and quiet operation.

Variable-speed scroll air-cooled modular units offer a wide capacity range designed to meet diverse project requirements, from small commercial systems to large industrial applications. Each module typically provides a cooling capacity from 20 kW to 60 kW, depending on configuration, compressor type, and operating conditions. Because modules can be combined in parallel, overall system capacity can be expanded significantly—multi-module combinations can reach up to 480 kW or more.The modular design allows users to select only the capacity needed at the initial installation and gradually expand based on project growth, renovation, or seasonal demand. With variable-speed scroll compressors, each module can adjust its output continuously according to actual load conditions. This ensures high partial-load efficiency, reduced energy waste, and better temperature stability.By connecting multiple modules, the system offers flexible redundancy. If one module requires maintenance, the remaining modules can continue operating, significantly improving reliability and reducing downtime. This makes the unit ideal for applications such as shopping malls, hotels, data centers, office buildings, schools, cleanrooms, manufacturing workshops, and other scenarios needing both efficiency and reliability.Overall, the capacity range is not fixed to a single value but scalable based on module quantity, achieving precision matching of cooling demand while supporting future expansion and energy-saving operation.

A modular design in air-cooled chiller systems refers to a structure in which multiple independent refrigeration modules are combined to form a larger, integrated cooling system. Each module operates as a complete refrigeration unit with its own compressor, heat exchanger, fan system, and control logic. This architecture brings several distinctive advantages that make modular chillers highly flexible, scalable, reliable, and energy-efficient for commercial and industrial applications.One of the most significant features is scalability. Users can start with a small initial capacity and gradually increase total system output by adding more modules as cooling demand grows. This incremental investment reduces upfront cost pressure and ensures the system can adapt to future expansion without replacing existing equipment.Another key feature is redundancy and reliability. Because each module operates independently, the failure of one module will not shut down the entire system. Remaining modules continue functioning, ensuring uninterrupted cooling. This redundancy is especially important in data centers, manufacturing processes, laboratories, or any environment requiring continuous cooling.Modular systems also excel in energy efficiency. With multiple compressors operating in stages, the unit can match output to actual load conditions with high precision. This avoids excessive on/off cycling and significantly improves partial-load performance. When combined with variable-speed scroll or screw compressors, modular systems can achieve even greater seasonal energy efficiency ratios.Installation flexibility is another defining characteristic. Modules are compact, lightweight, and can be transported, lifted, and assembled easily on roofs, equipment yards, or indoor machinery rooms with limited access. Different configurations—parallel placement, L-shaped, back-to-back—allow adaptation to space constraints.In terms of control, modular systems feature advanced intelligent networking. Through master-slave or distributed control logic, each module communicates with others to coordinate capacity output, fault detection, load balancing, and efficiency optimization. Modern systems allow centralized BMS integration and remote monitoring.Finally, modular chillers simplify maintenance. Technicians can service a single module while others remain operational, reducing downtime. Components are standardized, and the modular layout means easier replacements and upgrades.

A Variable Speed Scroll Air-Cooled Modular Unit is a high-efficiency HVAC system designed to provide flexible, scalable cooling and heating by combining advanced inverter scroll compressor technology with modular architecture. Unlike traditional constant-speed systems, a variable speed modular unit continuously adjusts compressor output based on real-time load demand. This delivers precise temperature control, greater comfort stability, and significant energy savings, especially during partial-load operation.The “air-cooled” design uses ambient air to dissipate heat, eliminating the need for cooling towers, water piping, or complex water treatment. This makes installation simpler, reduces maintenance costs, and allows the unit to operate reliably even in areas where water resources are limited.The “modular” structure means each module functions independently yet can be interconnected to form a larger system. Users can start with a few modules and expand capacity as the project grows. Multiple modules also provide redundancy—if one module requires service, the others continue operating, improving system reliability.Aurashu’s variable speed scroll modular units integrate intelligent control systems, allowing multi-module networking, automatic load balancing, and remote monitoring. They are suitable for commercial buildings, industrial facilities, data rooms, hotels, and places requiring stable, efficient year-round climate control. Their compact footprint, quiet operation, and flexible configuration make them ideal for both new installations and renovation projects.