Danfoss MTZ144-4VI Compressor

The Danfoss MTZ144-4VI is a heavy-duty, 4-cylinder hermetic reciprocating compressor designed specifically for medium-temperature (MT) refrigeration applications. Operating on a 380-400V/3ph/50Hz or 460V/3ph/60Hz power supply, this fixed-speed unit provides reliable capacity across a wide envelope. It is a direct cross-reference for the MTZ144HV4AVE, making it a drop-in replacement for many existing commercial racks. This model is optimized for POE oil (Polyester 175PZ) and supports an extensive list of refrigerants including R404A, R134a, R407A, R407C, R407F, R448A, and R449A. With a swept volume of 241.87 cm³ and an LRA of 130A, it delivers high-torque performance for demanding cold storage and process cooling environments. The unit features 1 3/4" Rotolock suction and 1 1/4" Rotolock discharge connections, ensuring a secure and serviceable fit for commercial contractors.

Key Benefits for the Contractor

• Broad Refrigerant Versatility: Fully compatible with HFCs and HFO blends like R448A/R449A, providing flexibility for future-proofing installations.
• High Performance Density: Delivers 96,936 Btu/h on R134a and 80,472 Btu/h on R404A at standard MT rating points.
• Robust Internal Protection: Includes an internal overload protector to prevent motor damage during phase loss or locked rotor conditions.
• Ease of Service: Features standard 3/8" NPT oil equalization for parallel rack configurations and Schrader gauge ports for fast diagnostics.
• Complete Replacement Kit: Ships with an initial oil charge, mounting grommets, and Rotolock solder sleeves to reduce on-site labor.

Common Questions

What is the primary difference between the MT and MTZ series?
The MT series is designed for mineral oil and CFC/HCFC refrigerants like R22, whereas the MTZ series (like this MTZ144-4VI) uses POE oil to maintain compatibility with modern HFC and HFO refrigerants.

Can this compressor be used in a parallel rack system?
Yes, the inclusion of a 3/8" oil equalization connection makes it suitable for manifolding multiple units in a parallel refrigeration circuit.

Does this unit require a specific motor starter?
Since this is a 3-phase compressor with an LRA of 130A, it is typically used with a suitably rated contactor and does not require start capacitors or relays required by single-phase models.

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.