Danfoss 120Z0459 Crankcase Heater

The Danfoss 120Z0459 Crankcase Heater is a critical PTC crankcase heater designed to prevent refrigerant migration and ensure reliable compressor lubrication during off-cycles. Since this is a positive temperature coefficient (PTC) component, it provides self-regulating heat output, drawing 27 Watts to maintain the oil sumps temperature without requiring external thermostats. This model is a direct cross-reference for the Danfoss 7303507, making it a drop-in replacement for scroll compressor maintenance and repair. Its broad 230-600V compatibility allows technicians to standardize truck stock for various commercial HVACR applications. Engineered for durability in demanding environments, the 120Z0459 ensures the refrigerant stays out of the oil, preventing flooded starts that lead to bearing wear and mechanical failure. For contractors managing Danfoss compressor parts, this heater provides a high-reliability solution for systems operating in low ambient conditions where maintaining oil viscosity is paramount for long-term system performance.

• Self-Regulating PTC Technology: Automatically adjusts heat output based on ambient temperature for energy efficiency and component longevity.
• Wide Voltage Range: Rated for 230V to 600V applications, providing maximum versatility across different job sites.
• Direct OEM Interchange: Fully identical to Danfoss 7303507 for seamless integration into existing system builds.
• Preventative Protection: Eliminates liquid refrigerant migration to the oil sump, reducing the risk of compressor slugging at startup.
• Simplified Installation: Designed for an exact fit on compatible Danfoss scroll housings to ensure optimal heat transfer.

Is an external controller required for this heater?
No, the PTC heating element is self-regulating; it increases resistance as it reaches operating temperature, effectively controlling its own output without additional sensors.

Can I use the 120Z0459 to replace the 7303507?
Yes, the Danfoss 120Z0459 is the identical technical replacement for part number 7303507, maintaining the same electrical specs and physical dimensions.

What happens if the crankcase heater fails in cold weather?
Failure leads to refrigerant condensing in the oil. Upon startup, this causes foaming, which reduces lubrication and can cause immediate scroll compressor damage.

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.