Danfoss Surface Sump Heater | 56W, 230V | 120Z0390

Product Description: The 120Z0390 is a specialized surface-style crankcase heater used primarily with Danfoss scroll compressors. Unlike traditional wrap-around belts, this heater is designed to be mounted directly onto the compressor shell to deliver focused thermal energy to the oil sump. In the UAE’s climate, maintaining the oil temperature during the compressor’s off-cycle is vital. Even in high-ambient areas like Dubai and Abu Dhabi, refrigerant can migrate to the compressor oil during standby periods; the 120Z0390 keeps the lubricant warm to ensure refrigerant stays in a vapor state. This prevents “liquid slugging” and ensures immediate, effective lubrication upon startup, significantly extending the life of commercial and residential cooling equipment.

Key Features & Benefits:

• Efficient Heat Transfer: Surface-mount design provides direct contact with the compressor housing for optimal oil heating.
• Prevents Liquid Migration: Keeps refrigerant from condensing in the crankcase, protecting internal valves and scrolls from damage during startup in UAE units.
• Reliable 56W Output: Specifically calibrated to maintain oil viscosity for medium-sized Danfoss compressors without excessive power draw.
• Universal 230V Compatibility: Perfectly suited for standard UAE electrical grids and common HVAC control circuits.
• Rugged Construction: Built to withstand the high-vibration and high-temperature environments typical of Middle Eastern HVAC installations.

Technical Specifications:

FAQs:

• Q: Why is a 56W heater like the 120Z0390 necessary for UAE systems?
• A: Refrigerant always moves toward the coldest part of a system. When the compressor is off, it can become the “cold spot”; the heater prevents refrigerant from mixing with and diluting the oil, which is a major cause of failure in Dubai.
• Q: Can this heater be replaced without discharging the refrigerant?
• A: Yes, it is an external electrical component. It can be safely replaced by a UAE technician without opening the refrigeration circuit.
• Q: Does this model include adhesive or mounting hardware?
• A: This depends on the specific kit version, but it typically includes the necessary mounting strap or adhesive backing for secure attachment to the Danfoss compressor shell.