Danfoss HR Series is the mainstay high-efficiency scroll compressor for modern commercial refrigeration and air conditioning applications.
Model Differences and Selection Key Points
Model
Main Characteristics
Typical Applications and Selection Considerations
HRM045U4
Smallest displacement, single-phase power. Lowest cooling capacity in this group.
Suitable for small display cases, small condensing units, and applications with relatively light loads and single-phase power supply.
HRM047U4
Medium displacement, single-phase power. Capacity between 045 and 051.
A very widely used model for display cases or units with medium cooling demands.
HRM048U4
Medium-to-high displacement, single-phase power. Capacity close to 051.
Used for single-phase equipment requiring greater cooling capacity, often an alternative or upgraded model for the 047.
HRM051T4
Largest displacement in this group, three-phase power. Strong performance, more balanced operating current.
For equipment with high cooling demands, such as multi-door cabinets, medium-sized cold room units. Three-phase power is ideal for locations with industrial power, offering more stable and reliable operation.
HRM051U4
Largest displacement, but single-phase power. Provides maximum cooling but limited by single-phase electricity.
For applications requiring maximum cooling capacity but with only single-phase power available. Note: Pay attention to starting current and power cable gauge requirements.
Main Features and Advantages:
Top-Notch Energy Efficiency
Features optimized scroll design and high-efficiency motors, ensuring a high Coefficient of Performance (COP) and low operating costs across the entire operating range.
Ideal for energy-sensitive commercial applications requiring 24/7 operation.
Wide Operating Range
Designed for medium/low-temperature refrigeration (e.g., freezing, chilling) and air conditioning/heat pump conditions.
Capable of stable operation at both high evaporation temperatures (e.g., AC mode) and low evaporation temperatures (e.g., freezing mode), offering flexible application.
Exceptional Reliability
Robust sealing design and proven scroll technology ensure long service life and low failure rates.
Built-in motor protection guards against damage from voltage variations, overheating, or frequent start/stop cycles.
Excellent liquid tolerance and oil return capability, handling more severe system conditions.
Low Noise and Vibration
The inherent smooth, low-vibration operation of scroll compressors, combined with an optimized housing design, provides a quiet working environment.
Excellent System Compatibility
Compatible with various common refrigerants such as R22, R404A, R407C, R134a (check the technical manual for specific model support).
Designed for perfect matching with Danfoss and other brands of electronic expansion valves, controllers, and other system components.
Typical Applications:
Open display cases in supermarkets (beverage coolers, ice cream cabinets, deli cases, etc.).
Condensing units (for convenience stores, kitchens, etc.).
Small cold storage rooms.
Ice makers, beverage cooling equipment, etc.
Important Note:
Precise Selection: When selecting a compressor, never rely solely on the model code. The choice must be based on specific:
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