When should a filter-drier be replaced?

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Multiple Choice

When should a filter-drier be replaced?

The filter-drier is there to remove moisture and contaminants from the refrigerant. If the system is opened for service, if there’s a leak, or if moisture is suspected, moisture or debris can enter the system and saturate the filter-drier. Once it’s saturated, it can’t protect the system effectively, so it should be replaced to prevent moisture-related problems and acid formation in the refrigerant. Replacing it isn’t required just because the system was recharged or on a fixed maintenance schedule, and if the system is operating normally with no openings or moisture concerns, replacement isn’t necessary. So, replace the filter-drier whenever you open the system for service, after a leak, or if moisture is suspected.

The filter-drier is there to remove moisture and contaminants from the refrigerant. If the system is opened for service, if there’s a leak, or if moisture is suspected, moisture or debris can enter the system and saturate the filter-drier. Once it’s saturated, it can’t protect the system effectively, so it should be replaced to prevent moisture-related problems and acid formation in the refrigerant. Replacing it isn’t required just because the system was recharged or on a fixed maintenance schedule, and if the system is operating normally with no openings or moisture concerns, replacement isn’t necessary. So, replace the filter-drier whenever you open the system for service, after a leak, or if moisture is suspected.

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