Carrier 334357-755 Heat Exchanger

The Carrier 334357-755 Secondary Heat Exchanger is a precision-engineered OEM replacement part designed for 80,000 BTU 90%+ AFUE condensing furnaces. As a 20-cell condensing heat exchanger, this component is critical for recovering latent heat from combustion exhaust, significantly increasing system efficiency. This kit serves as a direct upgrade for older, failure-prone polypropylene-coated units, utilizing enhanced materials to better withstand the acidic condensate typical of high-efficiency gas cycles. It is a drop-in furnace repair part compatible with a wide range of Carrier, Bryant, and Payne multipoise models, including the 58MCA, 58MXA, and 350AAV series. For technicians, this 334357-755 heat exchanger kit includes the necessary gaskets and hardware to ensure a combustion-tight seal against the primary cell outlet panel. Accurate installation is vital to prevent exhaust gas leakage or pressure switch trips caused by secondary cell restriction. This genuine furnace component ensures the heat exchanger assembly meets factory performance specs for thermal transfer and flue gas management.

• Direct OEM Compatibility: Engineered specifically for 20-cell 80,000 BTU condensing furnace models from Carrier, Bryant, and Payne.
• Enhanced Corrosion Resistance: Built to handle the high-acidity environments of the condensing process better than original factory-installed baseline units.
• Full Installation Kit: Includes the secondary heat exchanger, necessary gaskets, and brass screws to streamline the replacement process.
• Optimized Thermal Transfer: Facilitates peak AFUE efficiency by maximizing latent heat recovery from flue gases.
• Replacement Versatility: Direct successor to multiple legacy part numbers, including 330502-706 and 330540-756.

What are the signs of a failed secondary heat exchanger?
Technicians often encounter 334357-755 failures evidenced by clogged condensate traps, rust flakes in the inducer housing, or "limit switch rollout" trips. A combustion analysis showing elevated CO or O2 levels often confirms internal cell restriction.

Is this the correct replacement for a 330502-706 part?
Yes, the 334357-755 is the specified OEM replacement for several older part numbers, including 330502-706, 330540-752, and 334357-758, typically found in 40-inch tall condensing furnaces.

Does this kit include the coupling box?
This kit primarily includes the secondary heat exchanger assembly and mounting gaskets. If the coupling box or cold spot baffle is heavily corroded, those components should be inspected and ordered separately to ensure a complete repair.

This item is not eligible for free shipping.

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.