Danfoss MTZ125-4VI Compressor

The Danfoss MTZ125-4VI is a heavy-duty Maneurop reciprocating compressor engineered for medium and high-evaporating temperature applications. As a technician, you know the value of the MTZ series’ large internal free volume, which provides superior protection against liquid slugging—a common killer in commercial refrigeration. This 10-HP hermetic unit is pre-charged with polyester oil (POE), making it fully compatible with R404A, R407C, R134a, and R407F refrigerants. Operating on a 460V / 3-phase / 60Hz power supply (or 400V/50Hz), it delivers a robust 78,906 Btu/h capacity for R134a applications. The 1-3/4" Rotolock suction and 1-1/4" Rotolock discharge ports facilitate rapid installation and serviceability. Its gas-cooled motor design ensures thermal stability across high-ambient conditions, while the 3/8" NPT oil equalization port supports parallel manifolding in multiplex systems. For those seeking a Danfoss MTZ125-4VI replacement, this reliable reciprocating workhorse is the industry standard for walk-in coolers and industrial process cooling.

• Multi-Refrigerant Compatibility: Optimized for HFCs like R404A and R134a using high-grade polyester oil for maximum lubricity.
• Enhanced Durability: Large internal volume protects the valve plate and pistons from damage during liquid refrigerant migration.
• Superior Efficiency: Features high-torque motors and a circular valve design to provide consistent COP in demanding HVACR environments.
• Installation Ready: Includes Rotolock connections for secure, leak-free seals and easier site-to-site retrofitting.

Common Questions

What is the primary difference between Danfoss MT and MTZ compressors?
The MT series is designed for use with mineral oil and R22, while the MTZ series, including the MTZ125-4VI, utilizes polyester oil to handle HFC refrigerants like R404A and R134a.

Can I use this compressor in a parallel rack system?
Yes. This unit features a 3/8" NPT oil equalization port and a built-in sight glass, making it suitable for manifolding with other compressors in a rack configuration.

What are the suction and discharge connection sizes?
This model uses a 1-3/4" Rotolock suction connection (with a 1-1/8" ODF sleeve) and a 1-1/4" Rotolock discharge connection (with a 3/4" ODF sleeve).

This item must ship via truck. Please contact us for freight quote.

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.