The filter drier should be _______ anytime the system is opened for servicing.

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Multiple Choice

The filter drier should be _______ anytime the system is opened for servicing.

Moisture control is the key idea here. The filter drier contains desiccant that removes moisture and traps contaminants from the refrigerant. When the system is opened for service, air and moisture can enter, and the desiccant can become saturated or contaminated—even if you can’t see it. Replacing the drier ensures you start with a fresh, effective barrier against moisture and debris, reducing the risk of moisture-driven problems like acid formation, corrosion, clogged metering devices, and compressor damage. Repairing, inspecting, or cleaning the same drier does not guarantee moisture removal or contaminant control, so they’re not reliable substitutes. Replacing the filter drier is the proper, best practice whenever the system is opened.

Moisture control is the key idea here. The filter drier contains desiccant that removes moisture and traps contaminants from the refrigerant. When the system is opened for service, air and moisture can enter, and the desiccant can become saturated or contaminated—even if you can’t see it. Replacing the drier ensures you start with a fresh, effective barrier against moisture and debris, reducing the risk of moisture-driven problems like acid formation, corrosion, clogged metering devices, and compressor damage.

Repairing, inspecting, or cleaning the same drier does not guarantee moisture removal or contaminant control, so they’re not reliable substitutes. Replacing the filter drier is the proper, best practice whenever the system is opened.

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