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A liquid line filter drier should be changed when it becomes saturated with moisture or debris, which can impair its ability to protect the system. Signs that it needs replacement include decreased system performance, increased pressure drops, and frequent compressor cycling. Additionally, it is advisable to replace the filter drier whenever the system is opened for repairs or when a refrigerant leak is repaired to ensure optimal operation. Regular maintenance checks can help determine the right timing for replacement.

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2mo ago

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