Lennox 93M09 Crankcase Heater

The Lennox 93M09 Crankcase Heater is a critical OEM component designed to maintain optimal compressor lubrication in high-voltage industrial HVACR applications. This belt-type heater operates at 480 Volts and delivers 90 Watts of consistent thermal energy to the compressor housing. Engineered for versatility, it features an adjustable diameter range of 9 1/4" to 11", ensuring a snug, high-contact fit for various scroll and reciprocating compressors. By keeping the oil temperature above the refrigerant's boiling point, this unit effectively prevents refrigerant migration and oil dilution during system standby, reducing the risk of bearing failure and mechanical binding upon startup. For contractors working on large-scale rooftop units or chillers, the 43" leads provide ample length for secure routing to the terminal box, facilitating a clean and professional installation in high-clearance cabinets.

• Optimized Compressor Longevity: Eliminates liquid refrigerant slugging and ensures proper oil viscosity for immediate lubrication during cold starts.
• Precise Fitment: The adjustable 9 1/4" to 11" diameter design allows for a universal fit across multiple Lennox and industrial compressor models.
• High-Voltage Efficiency: Specifically rated for 480V/90W systems to meet the thermal demands of heavy-duty commercial refrigeration and cooling units.
• Heavy-Duty Construction: Built with high-temperature lead wires and a durable heating element to withstand the rigors of continuous outdoor operation.

Why is my compressor oil foaming on startup?
Oil foaming is typically caused by refrigerant migration during the off-cycle. Installing a Lennox 93M09 ensures the crankcase remains warm, keeping the refrigerant and oil separated to prevent foam-induced lubrication failure.

Can I use this heater on a 240V system?
No. This heater is specifically designed for 480 VAC power supplies. Using it with lower voltage will significantly reduce the wattage output (rendering it ineffective), while higher voltage will cause immediate component failure.

How do I ensure the best heat transfer to the compressor?
Ensure the compressor surface is clean and free of rust. Tighten the belt-type heater securely around the lower part of the crankcase to maximize surface contact and thermal conductivity.

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.