Carrier 326600-751 Heat Exchanger Assembly

Thermostatic expansion valves are an integral part of your refrigeration unit. They are responsible for ensuring the right dosage of refrigerant is entering the cooling coil to ensure maximum efficiency in the air conditioning of the system.    These special expansion valves come with a temperature sensor that is mounted at the end of the evaporator coil. They incorporate signals from this sensor to maintain the required temperature of the HVAC system. The thermostatic expansion valve works like a precision device that can regulate the measurements of the liquid refrigerant that flows into the evaporator of your system. This regulation in the flow of the refrigerant is essential to prevent the reverse flow of the refrigerant into the compressor of your system.    Through this mechanism, the thermostatic expansion valve successfully separates the high and low pressure sides of the refrigeration/air conditioning system. The liquid refrigerant enters the expansion ...

Periodically check the heat exchanger assembly for pressure marks, surface oxidation, and signs of flame impingement on the metal sections. Check that the combustion chamber stays clean and that airflow through the unit remains consistent without blockage. Secure mounting points and gasket seals should be checked during service to prevent leakage and uneven thermal distribution.

• Cracking along weld joints from repeated heat expansion.
• Soot layering reducing thermal efficiency.
• Airflow restriction leading to overheating shutdowns.
• Warping of metal sections under prolonged high load.
• Combustion imbalance affecting heating consistency.