MARS 32621 Crankcase Heater

Experienced HVAC contractors understand that protecting the compressor from liquid slugging is non-negotiable. The MARS 32621 Crankcase Heater is a heavy-duty, 240V 50W belt-style heater engineered to maintain optimal lubricant temperature during the off-cycle. By keeping the crankcase oil warmer than the rest of the system, this belly-band heater effectively prevents refrigerant migration, ensuring that the compressor startup is smooth and the bearings remain properly lubricated. This specific model features a corrosion-resistant exterior and a high-temperature silicone rubber element, making it a reliable solution for harsh outdoor environments. The 30-inch insulated leads provide sufficient length for clean routing into the control box. Designed for a universal fit on various compressor housings, the MARS 32621 is a critical component for extending the service life of AC and refrigeration units in low-ambient conditions. Its moisture-proof construction ensures long-term durability against condensation and environmental exposure.

Key Benefits:

• Prevents Refrigerant Migration: Eliminates the risk of liquid refrigerant mixing with oil, which causes bearing washout and compressor failure.
• Rugged Construction: Features a corrosion-resistant exterior and high-temperature silicone rubber insulation for maximum reliability.
• Simple Installation: Adjustable belly-band design allows for a tight, secure fit around the compressor base for efficient heat transfer.
• Moisture-Proof Design: Completely sealed element and leads protect the heater from the effects of heavy condensation and rain.
• Universal Compatibility: Optimized for 240V HVAC systems, providing 50 watts of consistent heat for a wide range of compressor models.

Common Questions:

How do I check if my crankcase heater is working?
Use an ammeter to verify current draw when the compressor is off; a 50W, 240V heater should draw approximately 0.21 Amps. Alternatively, check for resistance with an ohmmeter (standard for this part is roughly 1152 ohms).

Where should the MARS 32621 be positioned on the compressor?
For maximum efficiency, the belt heater must be installed around the bottom of the compressor shell, below the oil level, ensuring the band makes firm contact with the entire surface.

Does this heater run while the compressor is operating?
No, the heater is typically wired through the auxiliary contacts of the contactor so that it energizes only when the compressor is de-energized, preventing unnecessary power consumption.

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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.