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Danfoss Scroll Compressor – MLZ / LLZ Series
Danfoss MLZ and LLZ hermetic scroll compressors are purpose-engineered for commercial refrigeration. MLZ compressors are optimized for medium-temperature refrigeration while LLZ compressors are designed for demanding low-temperature applications.
Unlike general air-conditioning scroll compressors, Danfoss MLZ and LLZ compressors are specifically engineered for refrigeration duty. The MLZ family covers medium-temperature refrigeration while LLZ extends the platform into low-temperature applications such as frozen storage and freezer systems.
🔍 MLZ vs LLZ – Which Series Do You Need?
MLZ Series
Medium-Temperature Refrigeration ScrollMedium and high back-pressure commercial refrigeration applications.
Typical ApplicationsCold rooms, display refrigeration, milk cooling, beverage cooling, air dryers and process cooling.
RefrigerantsMulti-refrigerant platform including R404A/R507, R134a, R22, R407A, R407F, R448A, R449A, R452A, R513A and selected A2L refrigerants.
MT / MBP Multi-Refrigerant POE OilLLZ Series
Low-Temperature Refrigeration ScrollLow back-pressure and low-temperature commercial refrigeration applications.
Typical ApplicationsFreezer rooms, frozen-food storage, supermarket freezers and low-temperature refrigeration equipment.
RefrigerantsR404A/R507, R448A, R449A, R452A and selected new A2L refrigerants depending on compressor evolution and configuration.
LT / LBP Low Temperature Injection Options📋 Quick Comparison
| Series | Application | Main Refrigerants | Technology | Typical Use |
|---|---|---|---|---|
| MLZ | Medium Temperature / MBP | R404A/R507, R134a, R22, R407A/F, R448A, R449A, R452A, R513A + selected A2L | Fixed-Speed Scroll | Cold Rooms / Process Cooling / Commercial Refrigeration |
| LLZ | Low Temperature / LBP | R404A/R507, R448A, R449A, R452A + selected A2L | Fixed-Speed Scroll with injection options | Freezer Rooms / Frozen Storage / Supermarket Freezers |
✨ Key Features & Benefits
Refrigeration-Optimized Scroll
Dedicated scroll geometry is optimized for refrigeration pressure ratios rather than general air-conditioning duty.
High Efficiency
High-efficiency motor and optimized scroll design help reduce refrigeration-system operating costs.
Low Noise & Vibration
Scroll compression provides smooth, low-pulsation operation with fewer moving compression components.
Low-GWP Refrigerants
Modern MLZ and LLZ configurations support several lower-GWP refrigerants, including selected A2L options.
Connection Options
Brazed and Rotolock connection configurations are available depending on compressor model.
Parallel Applications
Selected MLZ and LLZ compressors can be applied in parallel refrigeration systems when Danfoss application requirements are followed.
📘 Available MLZ & LLZ Compressor Models
🔵 MLZ Series – Medium Temperature Models
The MLZ family is designed primarily for medium-temperature commercial refrigeration. The standard range extends from approximately 2 HP through 10 HP, with additional large-frame MLZ configurations available separately.
| Model | Nominal HP | Swept Volume | 50 Hz Displacement | Oil Charge | Approx. Net Weight |
|---|---|---|---|---|---|
| MLZ015 | 2 HP | 33.8 cm³/rev | 5.9 m³/h | 1.1 L | 31 kg |
| MLZ019 | 2.5 HP | 43.5 cm³/rev | 7.6 m³/h | 1.1 L | 31 kg |
| MLZ021 | 3 HP | 46.2 cm³/rev | 8.0 m³/h | 1.1 L | 31 kg |
| MLZ026 | 3.5 HP | 57.1 cm³/rev | 9.9 m³/h | 1.1 L | 31 kg |
| MLZ030 | 4 HP | 68.8 cm³/rev | 12.0 m³/h | 1.6 L | 37 kg |
| MLZ038 | 5 HP | 81.0 cm³/rev | 14.1 m³/h | 1.6 L | 37 kg |
| MLZ042* | 5.5 HP | 93.1 cm³/rev | Approx. 16.2 m³/h | 1.6 L | Approx. 37 kg |
| MLZ045 | 6 HP | 98.6 cm³/rev | 17.2 m³/h | 1.6 L | 37 kg |
| MLZ048 | 7 HP | 107.5 cm³/rev | 18.7 m³/h | 1.6 L | 37 kg |
| MLZ058 | 7.5 HP | 126.0 cm³/rev | 21.9 m³/h | 2.7 L | 44 kg |
| MLZ066 | 9 HP | 148.8 cm³/rev | 25.9 m³/h | 2.7 L | 45 kg |
| MLZ076 | 10 HP | 162.4 cm³/rev | 28.3 m³/h | 2.7 L | 45 kg |
🔵 Additional Large-Frame MLZ – MLZ116
Danfoss also lists the larger MLZ116 compressor within the MLZ family. It is a separate large-frame configuration and should not be assumed to have the same refrigerant approvals or construction details as MLZ015–MLZ076.
| Model | Swept Volume | 50 Hz Speed | Oil Charge | Net Weight | Example Refrigerant |
|---|---|---|---|---|---|
| MLZ116 | 249.9 cm³/rev | 2900 rpm | 6.7 L | Approx. 100 kg | R404A* |
🟣 LLZ Series – Low Temperature Models
The LLZ family is optimized for low-temperature refrigeration and consists of five principal compressor sizes from nominal 4 TR through 10 TR class.
| Model | Nominal Class | Swept Volume | 50 Hz Displacement | Oil Charge | Net Weight |
|---|---|---|---|---|---|
| LLZ013 | 4 TR | 67.4 cm³/rev | 11.7 m³/h | 1.62 L | 42 kg |
| LLZ015 | 5 TR | 83.5 cm³/rev | 14.5 m³/h | 1.62 L | 42 kg |
| LLZ018 | 6 TR | 97.6 cm³/rev | 17.0 m³/h | 1.62 L | 43 kg |
| LLZ024 | 8 TR | 120.2 cm³/rev | 20.9 m³/h | 2.51 L | 46 kg |
| LLZ034 | 10 TR | 168.7 cm³/rev | 29.4 m³/h | 2.51 L | 51 kg |
🌡️ Refrigerant Compatibility
MLZ Refrigerants
LLZ Refrigerants
Danfoss has introduced newer MLZ / LLZ Evolution B and Evolution C configurations for selected A2L refrigerants including R454A, R454C and R455A/R455C.
A2L approval depends on compressor evolution, motor code, market certification and exact model. Always verify the complete Danfoss compressor code before selection.
🔎 Understanding MLZ / LLZ Model Numbers
| Example Element | Meaning |
|---|---|
| MLZ | Medium-temperature refrigeration scroll-compressor family |
| LLZ | Low-temperature refrigeration scroll-compressor family |
| 015 / 030 / 076 etc. | Compressor nominal-capacity designation |
| T | Design optimized for refrigeration |
| Motor Code | Identifies compressor voltage, phase and frequency |
| Connection Code | Identifies brazed or Rotolock connection arrangement |
| Evolution A / B / C | Identifies compressor generation, oil/refrigerant qualification and certification configuration |
Send the complete compressor nameplate model and Danfoss code number so the voltage, connection, refrigerant approval and compressor evolution can be verified.
💡 Why Use a Refrigeration-Specific Scroll Compressor?
Refrigeration systems operate at different pressure ratios and evaporating temperatures from standard comfort air-conditioning systems. Danfoss MLZ and LLZ compressors use scroll designs optimized specifically for refrigeration, providing compact construction, efficient compression and reliable operation across demanding commercial cooling conditions.
🏢 Typical Applications
❄️ Cold Rooms
Chilled and medium-temperature storage.
🧊 Freezer Rooms
Low-temperature frozen storage using LLZ.
🛒 Supermarkets
Display cases and commercial refrigeration.
🥛 Milk Cooling
Dairy and food-processing refrigeration.
🏭 Process Cooling
Commercial and industrial cooling equipment.
🔍 How to Select the Correct MLZ / LLZ Compressor
MLZ and LLZ compressors are designed for different refrigeration temperature ranges and should not be selected only according to horsepower or physical size.
Always verify the complete compressor model, refrigerant, compressor evolution, voltage, cooling capacity, evaporating temperature, condensing temperature and connection type before compressor replacement.
Need a Danfoss MLZ or LLZ Scroll Compressor?
Contact RNA Engineering & Trading Sdn Bhd with your existing compressor model, Danfoss code number, refrigerant, voltage, evaporating temperature, condensing temperature and required cooling capacity. Our team can assist with selecting the suitable Danfoss refrigeration scroll compressor for your application.
Technical specifications, refrigerant qualification and product availability may vary according to compressor model, motor code, compressor evolution and market. Always verify the latest Danfoss technical documentation before final compressor selection.
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