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FRS125
FST
2FRS125
The FST pump-fed parallel screw compressor unit is designed to provide a centralized low-temperature refrigeration source for IQF freezers, blast freezers and cold-storage facilities.
This industrial refrigeration unit combines two screw compressors, a refrigerant circulation arrangement, oil cooling, electrical controls and system protection components on a coordinated equipment platform.
The parallel compressor configuration allows the refrigeration system to respond to changing cooling loads. Both compressors can operate when the IQF freezer requires full refrigeration capacity, while reduced-capacity operation can be used when the system load decreases.
The unit is suitable for supplying low-temperature refrigeration to:
Spiral freezers
Tunnel freezers
Fluidized IQF freezers
Impingement freezers
Blast freezers
Frozen-food cold rooms
Low-temperature processing rooms
The final compressor quantity, refrigeration capacity and refrigerant circulation design should be calculated according to the connected freezer load, production hours and required evaporation temperature.
The technical specifications below outline the precise engineering metrics of the PSHL-125-40p system. With a theoretical displacement of 495m3/h per set at 60HZ, the unit moves refrigerant with exceptional volume and speed. The integration of a liquid cooling oil cooler ensures that the compressor lubricant maintains optimal viscosity, even during continuous operation at the -40℃ design condition. Weighing approximately 2700 kg, the physical mass of the unit anchors it firmly to the ground, eliminating micro-vibrations and ensuring long-term structural integrity for years of continuous service.
Compressor unit name | unit | Screw compressor unit | |
Compressor unit type | PSHL-125-40p | ||
Compressor | 2set | Bitzer HSN8571-125-40P | |
Compressor | Theory Displacement | m3/h | 495m3/h/set 60HZ |
Energy Adjustable range | 100%-75%-50% | ||
refrigerant | type | R404A | |
Design conditions | ℃ | -40℃/40℃ | |
refrigeration capacity | KW | 186KW | |
Voltage and power | 3N/60Hz/440V 169.8KW | ||
oil cooler | liquid cooling | ||
Overall dimensions(L*W*H) | mm | 3450×1750×2300 | |
Unit weight | kg | ～2700 | |
At the heart of this refrigeration design plan lies the authentic, imported Bitzer semi-hermetic screw compressor technology. The twin-compressor parallel architecture is engineered to handle extreme low-temperature conditions with minimal mechanical wear, ensuring an extended operational lifespan. When active, the system produces a steady, low-frequency hum indicative of its balanced internal rotors and precise machining.
Intelligent Energy Regulation: The system features a multi-stage energy adjustable range of 100%-75%-50%. This allows the unit to dynamically scale its power consumption based on real-time thermal loads, drastically lowering daily electricity usage without sacrificing temperature stability.
Targeted Application Scenarios: Custom-calibrated for extreme environments, this parallel unit serves as the ideal thermal engine for IQF (Individual Quick Freezing) freezers, high-capacity tunnel freezers, and large-scale multi-zone cold chain warehousing facilities.
Compact & Accessible Structure: Despite its massive cooling capacity, the modular pipeline design keeps the overall footprint remarkably compact. The logical layout of valves and sight glasses provides maintenance personnel with immediate visual feedback and unhindered tool access.
Rigorous Factory Validation: Before dispatch, every single unit undergoes strict pressure leak detection and simulated extreme-load performance testing to meet stringent international industrial safety and quality certifications.
The core operating parameters dictate the system's ability to pull down temperatures rapidly and maintain them under heavy product loads. The configuration below details the exact specifications required to achieve the targeted 186Kw refrigeration capacity efficiently.
operation condition | Compressor unit type | refrigerating capacity | input power |
-40/+40℃ | HSN8571-125-40P-2 | 186Kw | 169.8Kw |
Choose screw compressor 2set：HSN8571-125-40P. This strategic dual-setup ensures that if one circuit requires scheduled maintenance, the secondary unit can maintain baseline temperatures, actively preventing product loss and ensuring continuous facility operation.
Type：ZFLA-1200 evaporative condenser. This specific condenser model is selected for its superior heat rejection capabilities. The heavy-gauge galvanized casing resists environmental corrosion, while the optimized fan blades deliver a high-volume, low-decibel airflow. This rapid and consistent heat dissipation is crucial for maintaining the efficiency of the entire refrigeration cycle.
Main electrical elements are Schneider. The control panel features a highly responsive PLC system that automates strict temperature regulation and smart start/stop sequences. Operators interact with a clear, tactile interface that provides instant digital readouts. Furthermore, the system integrates multiple safety protocols, including high/low pressure alerts, motor overload protection, phase loss detection, and oil temperature/level warnings, ensuring absolute operational safety under the most demanding conditions.
The refrigeration unit uses two Bitzer HSN8571-125-40P screw compressors connected in parallel.
The dual-compressor arrangement provides a larger combined refrigeration capacity than a single-compressor system and allows the control system to coordinate compressor operation according to the cooling demand.
Each compressor has a listed theoretical displacement of 495 m³/h at 60 Hz.
The listed refrigeration capacity is 186 kW at the design condition of -40°C evaporating temperature and +40°C condensing temperature.
This capacity is a reference value for the published system configuration. Actual performance changes with:
Evaporating temperature
Condensing temperature
Refrigerant
Compressor frequency
Suction conditions
Liquid supply condition
Connected evaporator load
Ambient operating conditions
The final refrigeration capacity should be confirmed through project-specific calculations.
The refrigeration system uses a full-liquid or pump-fed supply arrangement to deliver refrigerant to the connected evaporators.
This configuration is intended for low-temperature freezing applications requiring stable refrigerant circulation across one or more evaporator circuits.
The liquid circulation system should be selected according to:
Evaporator height
Refrigerant flow rate
Piping distance
Number of connected evaporators
System pressure
Required recirculation ratio
Freezer operating schedule
The listed energy-adjustment stages are:
100%
75%
50%
Capacity control allows the refrigeration output to be adjusted when the production load changes.
For example, the required load may decrease during:
Production startup
Product changeover
Partial line operation
Reduced freezer throughput
Cold-room temperature holding
Defrosting of one connected evaporator
The final control sequence should be configured according to the number of compressors and the connected refrigeration loads.
The compressor unit is designed around a low-temperature operating condition of -40°C evaporation and +40°C condensation.
This operating range is suitable for industrial freezing equipment requiring a low evaporating temperature to maintain the freezer chamber and product-freezing conditions.
The published configuration uses liquid cooling for the compressor oil cooler.
Oil-temperature control supports screw compressor operation under low-temperature and high-compression-ratio conditions.
The oil-cooling circuit, refrigerant flow and control components should be coordinated with the complete refrigeration-system design.
The compressor system can supply refrigeration to continuous IQF equipment used for meat, poultry, seafood, dumplings, vegetables and prepared foods.
The refrigeration capacity should be matched to:
Product heat load
Freezer fan heat
Conveyor heat
Air infiltration
Defrost frequency
Daily production hours
The unit can be connected to spiral freezers requiring continuous low-temperature refrigeration and stable operation over long production shifts.
The compressor capacity should be selected according to the freezer throughput and product inlet temperature.
Straight tunnel freezers can use the system as a centralized cold source.
Refrigerant piping, evaporator pressure drop and liquid-return conditions should be confirmed according to the tunnel length and evaporator arrangement.
The low-temperature compressor unit can support blast freezing rooms used for batch freezing of food products.
Blast-freezer capacity should be calculated from the total product weight, freezing cycle and room heat load.
The existing product description states that the system can serve both quick-freezing equipment and cold-storage facilities.
When one refrigeration system supplies multiple loads, the controls and refrigerant circuits should be designed to maintain the required temperature for each evaporator.
The complete refrigeration project may include:
Parallel screw compressor unit
Refrigerant pump
Liquid receiver or circulation vessel
Oil-cooling circuit
Evaporative condenser
Electrical control cabinet
Refrigeration valves
Suction and liquid piping
Safety-protection devices
Freezer evaporator connections
Refrigerant charging
Control-system interlocking
The exact supply scope should be listed clearly in the technical quotation.
The system can be configured for IQF freezers, spiral freezers, tunnel freezers, blast freezers and low-temperature cold rooms.
The reference system uses two Bitzer HSN8571-125-40P screw compressors connected in parallel.
The listed reference capacity is 186 kW under the design condition of -40°C evaporation and +40°C condensation.
Yes. The product is designed to support multiple low-temperature loads, subject to correct load calculation, piping design and control configuration.
The standard reference configuration uses R404A. Alternative refrigerants require separate compressor and system confirmation.
Yes. The listed capacity stages are 100%, 75% and 50%.
A ZFLA-1200 evaporative condenser is specified in the reference design plan. The final supply scope should be confirmed in the quotation.
Yes. The reference power supply is 3N/440 V/60 Hz. Other voltage and frequency requirements should be provided before system design.
