The Carrier 48TJ660001 Heat Exchanger is a critical OEM replacement component designed for 3-6 ton rooftop units. Built for high-performance thermal transfer, this commercial HVAC heat exchanger is essential for restoring the combustion integrity of Carrier 48TJ and Carrier 50TJ series packaged systems. A cracked or compromised heat exchanger poses a direct safety risk—specifically carbon monoxide bypass—and requires an immediate direct replacement heat exchanger to maintain safe, efficient building heat. This unit features heavy-duty construction to handle high-demand duty cycles and includes a heat exchanger gasket kit to ensure a gas-tight seal upon installation. As a standard technician-grade part, it replaces legacy part numbers such as 50DK406178. Precise alignment with the burner assembly and inducer housing is required for optimal airflow and flame stability. Contractors should verify the heat exchanger for physical breaches or scale buildup during routine seasonal maintenance to avoid emergency shutdowns.

• OEM Precision Fit: Engineered specifically for Carrier 48TJ and 50TJ units to simplify field installation and eliminate mounting modifications.
• Enhanced Thermal Efficiency: Optimized tube geometry maximizes heat transfer to the supply air stream while maintaining proper flue gas velocity.
• Gas-Tight Integrity: Includes a high-grade heat exchanger gasket kit to prevent combustion byproduct leakage into the conditioned space.
• Durable Material Composition: Constructed to withstand the thermal expansion and contraction cycles typical of 3-6 ton commercial rooftop applications.

Is the gasket kit included with this part?
Yes, this assembly typically includes the necessary gaskets to ensure a complete and secure seal between the heat exchanger cells and the burner plate.

Will this fit my 48TJ series rooftop unit?
This OEM heat exchanger is the standard replacement for most Carrier 3-6 ton rooftop units. However, you must verify your specific model and serial number against the manufacturer's parts list to confirm compatibility.

What are the signs of a failing heat exchanger in a transition season?
Watch for soot accumulation, erratic flame patterns when the blower kicks on, or carbon monoxide alarms. Visual inspection of the cells for cracks or rusted-out spots is a standard part of a professional HVAC audit.

This item must ship via truck. Please contact us for freight quote.

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.