Danfoss 120Z0058 Crankcase Heater

The Danfoss 120Z0058 is a high-performance crankcase heater designed specifically for scroll compressor protection in commercial refrigeration and HVAC systems. Operating at 400V with a 50W output, this heater prevents refrigerant migration to the compressor oil during off-cycles, ensuring the lubricant retains its viscosity for immediate startup. For technicians servicing Danfoss SM, SY, and SZ series compressors, maintaining proper sump temperature is critical to avoiding liquid slugging and premature bearing wear. This flexible heater belt features a durable surface contact design that optimizes heat transfer to the lower housing. Whether performing a compressor replacement or a routine maintenance overhaul, ensuring the crankcase heater wattage matches the technical specifications of the 400V circuit is essential for system longevity. This HVAC replacement part is engineered to withstand high-ambient machine room conditions while providing consistent thermal output to protect the internal mechanical components of the refrigeration compressor.

• Prevents Refrigerant Dilution: Maintains oil temperature above the saturation point to keep the lubricant free of liquid refrigerant.
• Direct Fitment: Engineered specifically for Danfoss scroll housings, ensuring the belt makes full contact for maximum thermal conduction.
• Reliable Cold Weather Starts: Essential for outdoor condensers and rooftop units exposed to low ambient temperatures to prevent high-torque startups.
• Heavy-Duty Construction: Built to endure vibration and thermal cycling common in industrial refrigeration applications.

Is this heater compatible with 230V systems?
No, this model is rated specifically for 400V electrical configurations. Wiring it to a lower voltage will result in insufficient heat output, while a higher voltage will cause immediate element failure.

What is the primary function of the 120Z0058 in a scroll system?
It prevents the accumulation of liquid refrigerant in the oil sump during the off-cycle, which protects the scrolls and bearings from damage during the next start sequence.

Does this heater require an external controller?
It is typically wired into the compressor contactor's auxiliary dry contacts to ensure the heater is energized only when the compressor is idle.

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.