• Secondary side circulating water systems in central heating systems
• Chilled water and cooling water circulation systems in central air conditioning systems

The Dongfang DFJN intelligent high-efficiency circulating unit combines large, medium, and small high-efficiency pumps with multifunctional filters, flow monitoring systems, plate heat exchangers, and intelligent control systems. Utilizing joint-venture frequency converters and PLC programming, it achieves variable-frequency speed regulation across multiple pumps for exceptional energy savings.

• Large, medium, and small pump combination provides wide high-efficiency operating range
• Automatic pump activation based on system flow requirements
• CFD-optimized hydraulic model for maximum efficiency

• Full-bore non-slamming low-resistance check valves
• Laser-cut materials with precise dimensions and smooth surfaces
• Full-bore straight-through flange butterfly valves

• Dedicated frequency converter for each pump
• Real-time adjustment based on outlet pressure, differential pressure, temperature, and flow rate
• Accurate flow and pressure control for optimal system performance
• Specialized control cabinet with grid parameter monitoring and fault handling

• Coating thickness measurement for corrosion resistance and extended lifespan
• IP55-rated inverters with dust-proof protection and thickened PCB coatings
• Imported brand components and programmable logic controllers

• Factory-prefabricated pump sets with modular assembly
• 304 stainless steel pipelines with pickling, passivation, and electrolytic polishing
• Multifunctional filters with scale removal, filtration, and back-flushing capabilities

The electromechanical integrated design features modular components on a common base with factory testing. No on-site fabrication required, reducing installation time and costs. Ready for immediate operation upon power and water supply connection.

• Back-hung pump set and frequency converter mounting
• Compact control cabinet with reduced footprint
• Smaller overall dimensions than traditional units

For central heating applications, plate heat exchangers can be integrated into the system.