Danfoss MT40-4VI Compressor

The Danfoss MT40-4VI is a specialized 460V 3-phase 3.5HP reciprocating compressor engineered for medium temperature refrigeration applications. Utilizing Maneurop MT series technology, this unit features a large internal free volume that provides superior resilience against liquid slugging and ensures consistent BTU/hr performance under demanding thermal loads. Designed for use with R22 refrigerant and Mineral Oil (160P), the MT40-4VI utilizes rotolock connections to streamline field replacement and reduce brazing requirements. This high-suction gas-cooled compressor maintains motor integrity by drawing cool refrigerant vapor directly over the windings, preventing overheating during continuous duty cycles. For contractors managing commercial walk-ins or process chillers, this industrial hermetic compressor offers a robust mechanical design with internal protection against high discharge temperatures and luxury pressure relief, ensuring long-term system stability in critical cooling environments.

Technical Specifications & Key Benefits

• Optimized Compatibility: Designed specifically for R22 medium temperature systems requiring high torque starting capabilities.
• Internal Motor Protection: Features an internal line break protector to prevent motor burnout due to phase loss or voltage fluctuations.
• Enhanced Liquid Management: A 100% suction gas-cooled design mitigates risks associated with liquid return during defrost cycles.
• Standardized Footprint: Simplifies the HVACR retrofit process with industry-standard mounting and rotolock suction and discharge valves.
• Efficient Lubrication: Large oil sump capacity improves heat dissipation and ensures critical components remain lubricated during low-load periods.

Common Questions

What is the proper oil type for the MT40-4VI?
This model is factory-charged with 160P Mineral Oil, which is specifically formulated for mineral-based refrigerant systems like R22.

Can this compressor be used with R404A or R134a?
The MT series is designed for mineral oil; for HFC refrigerants, the MTZ series with POE oil is required to ensure proper oil return and component longevity.

What are the connection sizes for this 3.5HP unit?
The unit typically utilizes 1-1/4" rotolock suction and 1" rotolock discharge connections for secure, leak-proof integration.

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.