Danfoss MT44-4VI Compressor

The Danfoss MT44-4VI is a heavy-duty, hermetic reciprocating compressor engineered specifically for R22 medium-to-high evaporating temperature applications. Using 160P mineral oil, this two-cylinder Maneurop unit delivers a robust 43,999 Btu/h of cooling capacity under standard technical rating conditions (45°F evaporator, 130°F condenser). Built with a high-torque motor and internal protection, it handles high-stress environments and resists liquid hammering thanks to its large internal free volume. Contractors value this model for its dual-voltage capability, operating reliably on 380-400V/3Ph/50Hz or 460V/3Ph/60Hz supplies. The rotolock connections, featuring a 1 3/4" suction and 1 1/4" discharge with ODF sweat sleeves, facilitate faster field replacements and secure sealing. This hermetic reciprocating compressor features a 3/8" NPT oil equalization port, making it suitable for multi-compressor racks and parallel configurations in demanding HVACR refrigeration systems.

Key Benefits for Contractors:

• Enhanced Reliability: The circular valve design and suction-gas cooling reduce thermal stress and internal pressure losses.
• Protection Against Slugging: A large housing volume protects against liquid refrigerant intake during startup or system fluctuations.
• Versatile Power Supply: Wide voltage range and 50/60Hz compatibility simplify inventory for varying site requirements.
• Efficient Lubrication: Standard 160P mineral oil charge ensures proper crankcase lubrication for R22 refrigerant cycles.
• Ease of Service: Integrated oil sight glass and threaded oil equalization port streamline maintenance and parity checks.

Common Technical Questions:

What is the maximum number of starts allowed per hour?
To prevent motor winding overheating, the compressor should not exceed 12 starts per hour. High start-frequency applications may require a soft starter or crankcase heater.

Can I use POE oil with this MT series compressor?
The MT series is factory-charged with mineral oil for R22 use. For HFC refrigerants requiring Polyolester (POE) oil, the MTZ series is the correct specification to prevent oil return and compatibility issues.

What is the lock rotor amperage (LRA) for the MT44-4VI?
For this specific motor code 4, the LRA is rated at approximately 58 Amps, which must be considered when sizing circuit breakers and contactors.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.