Difficulty: Easy
Correct Answer: Correct
Explanation:
Introduction / Context:
Moisture inside a refrigeration circuit causes ice formation at expansion devices, chemical reactions, and acid formation that damages compressors. A drier (often combined with a filter) is essential to system reliability.
Given Data / Assumptions:
Concept / Approach:
The drier removes dissolved and free moisture from the liquid refrigerant and traps particulates. Moisture removal prevents freeze-ups at the throttle device and limits hydrolysis that can create acids in the presence of POE oils and high temperatures.
Step-by-Step Solution:
Verification / Alternative check:
Sight-glass indicators often include a moisture dot. If it signals wet conditions, service practice is to replace the drier and evacuate the system properly.
Why Other Options Are Wrong:
Common Pitfalls:
Assuming evacuation alone removes all moisture; oil and surfaces retain water which the drier scavenges during operation.
Final Answer:
Correct
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