Lennox 93M05 Crankcase Heater

The Lennox 93M05 Crankcase Heater is a critical OEM component designed to prevent refrigerant migration and oil foaming in HVACR compressors during the off-cycle. This belt-type compressor heater provides a constant 40 watts of thermal energy at 240 volts, maintaining the lubricant at a temperature higher than the coldest part of the system. Engineered for adaptability, the 93M05 fits compressor housings with a 7" to 8" diameter (adjustable range approximately 6.35" to 8.5"), ensuring high-efficiency heat transfer through direct contact. As a veteran-grade HVAC replacement part, it is constructed for durability in demanding condenser environments, effectively reducing mechanical stress during cold starts. By utilizing this Lennox self-regulating heater, contractors can ensure optimal compressor longevity and reliable performance across various Lennox 100499-02 compatible residential and commercial units.

• Prevents Liquid Slugged Starts: Maintains oil temperature to ensure refrigerant remains in a vapor state, protecting internal compressor valves.
• Precise Fitment: Designed specifically for 7-8 inch diameter compressors with a secure belt-style mounting system for maximum surface contact.
• OEM Reliability: Direct Lennox 93M05 replacement ensures electrical compatibility with existing 240V control circuits and 50" lead wire requirements.
• Optimized Watt Density: Deliveries a consistent 40W output, providing enough heat to displace moisture without overheating the lubricant.

What happens if the crankcase heater fails?
Failure leads to refrigerant migration, which dilutes the compressor oil. This often causes "slugging" or oil foaming upon startup, leading to premature bearing wear or catastrophic compressor failure.

Is this part compatible with non-Lennox compressors?
While designed as a Lennox OEM part, this belt-type heater is compatible with any compressor within the 7" to 8" diameter range requiring a 240V 40W external heating element.

How do I verify the diameter for my specific unit?
Measure the circumference of the lower compressor housing. A 7" to 8" diameter corresponds to a circumference of approximately 22" to 25".

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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.