Tecumseh K31-9 Crankcase Heater

For field technicians maintaining hermetic systems, the Tecumseh K31-9 Crankcase Heater is a critical component for ensuring reliable compressor startups in low-ambient conditions. This 27W insert crankcase heater is specifically designed for integration into the compressor oil sump, providing direct heat transfer to maintain lubricant temperature above the refrigerant saturation point. By preventing refrigerant migration and subsequent oil dilution during the off-cycle, the K31-9 effectively mitigates the risk of liquid slugging and high-torque "flooded starts" that lead to premature mechanical failure.

Constructed for heavy-duty industrial and commercial HVACR applications, this OEM Tecumseh heating element is compatible with AG, AV, and O type compressor families. It operates at 600 VAC (max) and is rated up to 180°C, making it a robust choice for refrigeration units and heat pumps. The insertion design ensures more efficient thermal conductivity compared to standard belly-band heaters, concentrating heat exactly where it is needed to preserve oil viscosity. Proper wiring to the line side of the contactor ensures the heater energizes automatically when the compressor cycles off, providing continuous protection against moisture accumulation within the crankcase.

• Direct Thermal Transfer: The insertion design provides superior oil heating efficiency over wrap-around alternatives.
• Migration Prevention: Effectively keeps refrigerant from condensing in the crankcase during system downtime.
• Universal HVACR Application: Robust 27W output suitable for air conditioning, refrigeration, and heat pump compressors.
• Durable OEM Construction: Built to withstand harsh operating environments and high-temperature cycles.
• Optimized Startup: Reduces mechanical strain and internal friction by ensuring immediate lubrication at ignition.

Which compressor models are compatible with the K31-9?
This insert heater is engineered for Tecumseh AG, AV, and O type compressors that feature a dedicated immersion well.

Does this heater run while the compressor is operating?
No, it should be wired across the line side of the contactor so it only draws power during the off-cycle to prevent migration.

What is the primary cause of crankcase heater failure?
Most failures result from electrical surges or moisture ingress at the lead connections; always ensure a secure, sealed installation.

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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.