Danfoss 120U1766 Scroll Compressor

The Danfoss 120U1766 (Model HLP075T4LC6) is a high-performance light commercial scroll compressor engineered for R407C and R22 high temperature air conditioning applications. This robust unit delivers a nominal 75,000 Btu/h at 60 Hz under ARI conditions, specifically optimized for a 45/130°F design point. It features a versatile dual-frequency motor rated for 460V 3-phase 60Hz or 380-415V 3-phase 50Hz, incorporating internal motor protection for field reliability. The assembly utilizes PVE oil, making it suitable for both new installations and retrofits where refrigerant transitions are required. For streamlined installation, it includes 7/8" ODF sweat suction and 1/2" ODF discharge connections with spade terminals. This unit serves as the direct Danfoss scroll compressor replacement for legacy models including 120U1761, HLM075T4LC6, S1-015-04113-004, and 120U0531, ensuring a drop-in fit for numerous HVAC 3-phase compressors in the 6-ton capacity range.

Key Benefits for Contractors

• Broad Compatibility: Efficiently handles R407C and R22 refrigerants, providing a flexible solution for servicing older high-temp systems.
• Optimized Performance: Designed specifically for 45°F evaporating and 130°F condensing temperatures to maximize EER and system stability.
• Simplified Retrofitting: Direct mechanical and electrical replacement for HLM075 Series and specific S1-style OEM units reduces labor time.
• Advanced Protection: Integrated internal break thermal protection prevents motor burnout during high-load or phase-loss scenarios.
• Reliable Lubrication: Pre-charged with PVE oil, which offers superior moisture resistance and lubricity compared to standard POE options in mixed-gas environments.

Common Technical Questions

Is the Danfoss 120U1766 compatible with mineral oil environments?
While this unit ships with PVE oil, which is compatible with R22 and R407C, installers should ensure the system is properly flushed if transitioning from a system that utilized mineral oil to maintain chemical stability and heat transfer efficiency.

What are the wiring requirements for the HLP075T4LC6?
This is a 460V 3-phase unit requiring a three-leg power supply. It uses standard spade terminals for the electrical interface, and contractors should verify that existing contactors and overcurrent protection are rated for the 75k BTU load profile.

Can this compressor be used in heat pump applications?
The 120U1766 is optimized for high-temperature air conditioning and cooling cycles. For dedicated low-ambient heat pump applications, verify the operating envelope against the specific compression ratios required for heating cycles.

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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.