SC Refrigeration Practice Questions - South Carolina Refrigeration Contractor Examination Exam

Suction-line insulation on a low-temperature system must include a continuous external vapor barrier because:

The insulation is only decorative The pipe is colder than ambient dew point; without a barrier, moisture condenses in the insulation, destroying it and dripping on the space The vapor barrier keeps refrigerant from leaking out of solder joints Codes prohibit insulating liquid lines under any circumstance

Correct Answer:

The pipe is colder than ambient dew point; without a barrier, moisture condenses in the insulation, destroying it and dripping on the space

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