The EPA Certification manual claims that there are no drop-in substitutes for refrigerant but Ive seen refrigerant products that claim otherwise. Can you explain whats going on?
The EPA position is that there are no direct drop-in replacements. This statement means that nothing has to be changed on the system, and the performance is identical. While refrigerant blends have been engineered to have very similar pressure-temperature profiles, they are not drop-in replacements since the system operates differently (different capacity, COP, etc.) when used, and the controls, filter-drier, superheat adjustment, fan speeds, etc., may have to be changed to optimize performance on the replacement refrigerant.
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