I. Product Overview & Positioning This series represents classic, small to medium-sized open-type piston compressors under the Danfoss Maneurop brand. Renowned for their unparalleled ruggedness, exceptional reliability, and wide operating range, they are benchmark products in the fields of commercial refrigeration and heat pumps. They are designed for industrial-grade applications that prioritize long-term stable operation and ease of maintenance. II. Core Advantages & Features1. Ultimate Ruggedness & Durability
Heavy-Duty Design: Utilizes high-strength grey cast iron crankcases and large, heavy-duty bearings, creating a robust structure capable of withstanding extreme operating pressures and thermal shock, resulting in a very long design life.
Exceptional Valve Technology: Efficient ring valve design ensures good gas flow and mechanical efficiency, combined with very high fatigue strength and durability.
Proven Market Reliability: Decades of global application demonstrate exceptional reliability, making them the preferred choice for critical refrigeration systems.
2. Wide Operating Range & Excellent Adaptability
Extremely Broad Temperature Range: Designed for a vast range from very low evaporation temperatures (as low as -40°C) to high condensing temperatures (e.g., in heat pump applications), offering great versatility.
Strong Heat Pump Capability (MTZ): The MTZ series is optimized for heat pump applications, typically featuring a built-in liquid injection cooling system. This effectively controls discharge temperature under high compression ratio conditions, ensuring stable operation in high-temperature heating modes.
3. Ease of Maintenance & Flexibility
Open-Type Structure: The separate motor and compressor simplify maintenance and repairs (e.g., replacing shaft seals, valve plates, the motor itself).
Motor Selection Flexibility: Users can flexibly select the most suitable standard motor based on local power conditions (voltage, frequency) and performance requirements, offering significant design flexibility.
4. Broad Refrigerant Compatibility The series is designed for use with multiple refrigerants, including:
R404A / R507
R134a
R22 (for retrofit)
III. Model Analysis & Technical ParametersModel Comparison Table
Model
Displacement (cm³/rev)
Approx. Refrigeration Capacity Range (Medium Temp)*
Characteristics & Positioning
MT/MTZ 32
32
~ 1.3 - 1.7 Tons
Compact design for small commercial systems
MT/MTZ 36 JG
36
~ 1.5 - 2.0 Tons
Mainstay for small commercial systems, widely applicable
MT/MTZ 40 JH
40
~ 1.7 - 2.2 Tons
Small-medium systems, balanced capacity
MT/MTZ 44 HJ
44
~ 1.9 - 2.4 Tons
Larger capacity model within the series, more powerful
General Technical Characteristics:
Power Supply: No built-in motor; requires external matching. Supports various voltages and frequencies depending on the selected motor.
Lubrication: Uses Mineral Oil, Alkylbenzene Oil, or POE Ester Oil (depending on the chosen refrigerant).
IV. Typical Application Scenarios Thanks to their ruggedness and wide operating range, these compressors are widely used in:
Commercial Refrigeration: Convenience store display cases, small cold storage rooms, frozen display cabinets, bar beer cooling systems, walk-in coolers/freezers.
Condensing Units: Serve as the core power source for standardized commercial condensing units.
Commercial & Industrial Heat Pumps: The MTZ series is specifically used for domestic hot water heating, district heating, and industrial process heating.
Industrial Refrigeration: Process cooling in food processing, chemical industries, and others.
Summary The Danfoss Maneurop MT/MTZ 32 to 44 HJ series is a benchmark in the field of small to medium-power open-type piston compressors. They embody a philosophy of reliability in industrial design: while not necessarily targeting ultimate energy efficiency as the sole goal, their unparalleled ruggedness, tolerance for harsh conditions, extremely wide operating range, and ease of maintenance make them an irreplaceable choice for specific applications (especially those involving high pressure ratios, low temperatures, heat pumps, or requiring frequent maintenance). They are trusted, "hard-working" products for system integrators and end-users.
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