English
Español
Our Products
Featured Product Lineup
Explore our comprehensive range of high-quality refrigeration equipment designed for industrial and commercial applications.
Dual Compressor Air Cooled Screw Chiller
Two screw compressors on a common air-cooled frame · Staged capacity and service redundancy · 200kW-600kW
2 × screw Compressor configuration
50 / 100% Capacity staging
3.2 Full-load COP reference
This dual compressor air cooled screw chiller uses two screw compressors on a common frame with a shared air-cooled condenser bank, providing 200kW to 600kW of cooling with staged capacity and service redundancy. Screw compressors are selected over scroll for this capacity range because of their continuous compression and lower part-load losses at higher loads.
The two-compressor arrangement is specified for plant loads that vary between 50% and 100% through the operating period, and for installations where one compressor can be serviced while the other continues to carry partial load. The configuration is common in process cooling, district cooling schemes, and large facility air conditioning where a single large compressor would represent a single point of failure.
Compressor Arrangement
Compressor A Screw, 50% capacity Independent screw compressor with its own oil circuit, slide valve capacity control, and discharge line. Feeds a dedicated condenser section and expansion valve.
Compressor B Screw, 50% capacity Identical to compressor A, with independent oil circuit and slide valve. Both compressors feed the common evaporator through separate circuits.
Common Evaporator and controls Evaporator with two refrigerant passes, one per circuit. A single controller coordinates staging, slide valve position, and fan speed across both compressors.
Condenser Shared air-cooled bank Condenser coils arranged in two sections with EC fans. Fan speed controlled from the highest head pressure of the two circuits, with per-section isolation available during service.
Commercial and Technical Advantages
Staged capacity for part-load operation At 50% load, one compressor runs at its design point rather than a single large compressor operating far below it. Screw compressors with slide valve control retain efficiency across the load range, which is the principal reason for the two-compressor arrangement.
Service redundancy One compressor can be isolated and serviced while the other continues to carry up to 50% of the plant load. Whether this is sufficient depends on the load at the time; the available margin should be confirmed at selection stage.
Screw compressor characteristics Continuous compression with fewer moving parts than a reciprocating compressor at this capacity. Slide valve provides stepless capacity control between 25% and 100% per compressor. Suited to continuous industrial duty.
Circuit isolation Each circuit has isolation valves on suction, liquid, and discharge lines plus dedicated service ports. One circuit can be evacuated and repaired without disturbing the other, which is not possible on a single-compressor machine.
Sectioned condenser for service The condenser bank is arranged in two sections with isolation between them. One section can be cleaned or have fans replaced while the other continues to reject heat from the running compressor.
Per-compressor monitoring Modbus RTU registers expose per-compressor status, slide valve position, oil pressure, discharge temperature, and runtime hours, along with common water temperatures and alarm state.
Technical Parameters, 400kW Reference Configuration
Cooling
Capacity at 25°C water400 kW
Capacity at 15°C water335 kW
Capacity at 10°C water278 kW
Capacity, one compressor200 kW
Water setpoint range5°C to 20°C
Full-load COP3.2
RefrigerantR513A, 2 × 62 kg
Compressor and condenser
Compressor typeScrew, twin-rotor
Capacity controlSlide valve, 25–100%
Oil circuitIndependent per compressor
CondenserTwo sections, EC fans
Fan controlHead pressure, modulating
Low ambientStandard to -15°C
IsolationValves per circuit and section
Electrical and physical
Power supply400V AC, 3-phase, 50Hz
Rated current per phase286 A
Starting methodStar-delta or soft start
Sound pressure at 10 m72 dB(A)
Dimensions (L×W×H)5400 × 2300 × 2400 mm
Net weight, dry4200 kg
InstallationOutdoor slab or roof
Deployment Contexts
01 Process cooling at high capacity Chemical, pharmaceutical, and food processing plants where cooling loads exceed the practical range for scroll compressors and where continuous operation is required.
02 District and campus cooling Central plants serving multiple buildings or process areas, where load varies through the day and where capacity staging improves part-load efficiency against a single large compressor.
03 Facilities with limited outage tolerance Sites where a complete cooling shutdown is not acceptable and where one compressor must remain available while the other is serviced, subject to the load profile permitting 50% capacity.
04 Outdoor plant installations Facilities where the chiller is installed outdoors and a water-cooled condenser with cooling tower is not preferred, and where the air-cooled condenser can be located on a slab or roof.
Selection and Installation Notes
Load profile and staging benefit The efficiency benefit of two compressors depends on the load profile. Where the plant runs above 50% for most of the year, the arrangement is effective. Where it runs below 50% for long periods, single-compressor operation at low load may be less efficient than a smaller unit. Provide the load profile for evaluation.
Service redundancy versus load One compressor carries 50% of nominal capacity. Whether the plant can tolerate 50% capacity during service depends on the load at the time. Where the plant cannot, a three-compressor arrangement or additional capacity margin should be considered; state the requirement at enquiry stage.
Structural and rigging At 4200 kg dry, the unit requires a structural slab and a rigging plan for delivery and positioning. Confirm access route, lifting equipment capacity, and slab loading before ordering. The unit is delivered in one piece and cannot be split on site.
Electrical supply and starting 286 A per phase requires a dedicated supply. Starting method affects the supply requirement: star-delta and soft start reduce starting current compared with direct-on-line. Confirm the available supply capacity and the starting method against the site's electrical design.
Condenser airflow and clearance The air-cooled condenser rejects the full cooling load plus compressor power. Maintain 1000mm at the condenser inlet and 1500mm at the discharge. Where the unit is installed near a wall or adjacent units, confirm airflow is not restricted or recirculated.
Maintenance interval Oil analysis per compressor annually, with oil change per analysis result rather than fixed interval. Slide valve operation check annually. Condenser coil cleaning quarterly. Isolation valve operation check annually. Oil filter replacement per manufacturer schedule.
Procurement FAQ
Screw compressors are better suited to higher capacities and continuous duty, with fewer moving parts than reciprocating machines and more effective stepless capacity control than multiple scrolls in parallel. At 200kW to 600kW, a screw compressor with slide valve control retains efficiency across the load range, which multiple smaller scrolls achieve only through staging.
Yes. Each circuit has isolation valves and independent service ports. One compressor can be evacuated and serviced while the other continues to operate at 50% capacity. Whether the plant can tolerate 50% capacity during that period must be confirmed against the load at the time of service, and the schedule should be planned accordingly.
Below 50% load, one compressor runs with slide valve control across its full range. Above 50%, the second compressor starts and both modulate together. The controller rotates lead and lag assignment on runtime hours to equalise compressor wear across the two machines.
Star-delta is the standard starting method and reduces starting current compared with direct-on-line. Soft start provides smoother acceleration and further reduces current, at additional cost. The choice depends on the available supply capacity and the tolerance of other plant on the same supply. Confirm the site's electrical design before ordering.
Dimensional drawing including airflow clearances, wiring diagram, capacity and power table against water temperature for single and dual compressor operation, part-load performance data, compressor datasheet including oil charge and slide valve range, refrigerant data sheet per circuit, Modbus register map including per-compressor status, factory test record, and declaration of conformity under LVD and EMC directives.
Standard warranty is 24 months from commissioning or 30 months from shipment. Compressor coverage extends to 60 months per compressor. Service parts including compressors, slide valve components, oil filters, EC fans, and controllers are held for a minimum of 10 years. Warranty on compressors is conditional on oil analysis being documented per the maintenance schedule.
Product Categories
Complete Refrigeration Portfolio
Comprehensive range of industrial refrigeration equipment — standard & custom
Air Cooled Chiller
Efficient air-cooled systems for plastics, laser, food & diverse industries
energy savingWater Cooled Chiller
High-performance water-cooled industrial chillers with superior COP
high efficiencyAir Cooled Box Chiller
Compact, ready-to-use air cooled box chillers for small to medium loads
plug & playWater Cooled Box Chiller
Space-saving water cooled box type chillers with integrated pump & tank
integratedAir Cooled Screw Chiller
Heavy-duty screw compressor, air cooled — for large industrial applications
heavy dutyWater Cooled Screw Chiller
High-capacity water cooled screw chillers for continuous operation
reliableWater Cooled Screw Evaporative Cooling Chiller
Evaporative assisted cooling for maximum efficiency in hot climates
ecoProfessional Customization
Tailor-made solutions — from design to manufacturing, for your specific needs
CUSTOM ISO 9001 · CE Certified
Shanghai Soouney Refrigeration Equipment Co., Ltd.
A large-to-medium-sized high-tech enterprise integrating R&D, production and sales. Upholding "integrity, quality, service and innovation" — delivering reliable cooling solutions to the world.
11+
Export Countries
200+
Projects Delivered
19+
Years of Innovation
100%
Client Satisfaction
2007
Engineering Excellence in Refrigeration
Shanghai Soouney was founded with a vision to become a leading force in the refrigeration industry. We are China Dual Compressor Air Cooled Screw Chiller Manufacturers and Custom Dual Compressor Air Cooled Screw Chiller Suppliers. Today, we are a renowned brand in cabinet air conditioners and industrial chillers, recognised by professionals worldwide.
Rooted in the Chinese market, we provide reliable refrigeration solutions to clients across the globe — from standard products to professional customisation.
From standard products to professional customization — we deliver precision cooling.
R&D Driven
High starting points, stringent standards — continuous innovation
Integrity & Trust
Long-term partnerships built on transparency and after-sales support
Certified Quality
ISO 9001, CE, and industry-specific approvals across all lines
Global Mindset
Serving 40+ countries with tailored refrigeration solutions
"We don't just cool equipment — we build trust, one project at a time."
Why Soouney
Driven by Quality & Innovation
Committed to delivering excellence through continuous improvement and customer-centric solutions.
R&D Focus
High starting points, stringent standards — continuous product improvement
Integrity & Service
Long-term partnerships built on trust, transparency and after-sales support
Global Presence
Rooted in China, serving worldwide with reliable refrigeration solutions
Certified Quality
ISO 9001, CE, and industry-specific approvals for all product lines
