Daikin-McQuay 074513301 Crankcase Heater

The Daikin-McQuay 074513301 Crankcase Heater is a critical component for maintaining compressor integrity in commercial and industrial HVACR systems. Operating at 120V and delivering a steady 70 Watts of thermal output, this crankcase heater is engineered to keep the compressor oil temperature above the refrigerant saturation point during the off-cycle. This thermal regulation is essential to prevent refrigerant migration, which can lead to oil dilution, inadequate lubrication, and high-risk flooded starts. By ensuring the refrigerant remains in a vapor state within the crankcase, this heater protects internal components from liquid slugging and mechanical stress. Designed for direct compatibility with Daikin and McQuay equipment, this HVAC compressor heater features a robust construction and a compact form factor for straightforward field installation. For service technicians performing preventative maintenance or troubleshooting tripped breakers, the 074513301 is the reliable OEM-spec solution for ensuring long-term system performance in cold-weather conditions and low-ambient environments.

• Prevents Oil Dilution: Maintains high oil viscosity by keeping refrigerant from mixing with the lubricant during idle periods.
• 120V / 70W Performance: Optimized power rating for efficient heat transfer without excessive energy consumption.
• OEM Compatibility: Specifically designed as a direct replacement for Daikin-McQuay 074513301, ensuring exact fitment and electrical alignment.
• Compressor Protection: Eliminates liquid slugging on startup, significantly reducing mechanical wear on the compressor.
• Industrial Build Quality: Constructed to withstand the temperature fluctuations and harsh conditions of a commercial mechanical room.

What happens if the crankcase heater fails?
A failed heater allows refrigerant to migrate to the oil, causing a flooded start which can lead to bearing failure or broken internal valves upon compressor activation.

Does this heater run while the compressor is operating?
Standard field wiring typically involves an auxiliary contact or specific controller to ensure the heater is energized only when the compressor is in the "off" cycle.

Is this a universal fit for all 120V compressors?
While the electrical specs are 120V 70 Watts, it is best practice to verify the physical diameter and mounting requirements for your specific Daikin or McQuay model number.

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.