Description
Carrier 48TJ400118 Heat Exchanger Overview
The Carrier 48TJ400118 is an OEM replacement heat exchanger engineered specifically for compatible Carrier rooftop HVAC systems. Designed to meet Carrier’s original manufacturing specifications, this heat exchanger ensures efficient thermal energy transfer between combustion gases and supply air — maintaining system performance, reliability, and safety over the long term.
Key Features
- OEM Carrier replacement part — direct fit for compatible 48TJ series rooftop units
- Engineered for efficient heat transfer to maximize heating output
- Durable construction designed to withstand repeated thermal cycling
- Helps maintain proper combustion gas separation from conditioned air supply
- Supports system efficiency and occupant safety when installed correctly
- Manufactured to Carrier’s original design and quality standards
Application
This heat exchanger is intended for use in Carrier 48TJ series commercial packaged rooftop units. It is a critical component in the heating section of the unit, responsible for transferring heat from the burner assembly to the airstream without allowing combustion byproducts to mix with conditioned supply air. Replacing a damaged or failed heat exchanger restores proper heating function and helps ensure safe, code-compliant operation.
Why Choose OEM Carrier Parts?
Using genuine Carrier OEM replacement parts like the 48TJ400118 ensures compatibility, preserves equipment warranties, and delivers the performance your system was designed to achieve. Aftermarket substitutes may not meet the same dimensional or material tolerances, potentially compromising efficiency and safety.
Installation Notes
- Installation should be performed by a qualified HVAC technician
- Always verify compatibility with your specific unit model and serial number before ordering
- Inspect associated components — burners, flue passages, and seals — during replacement for optimal results







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