RSI Phase 9 Practice Test – Exam Prep & Practice Questions

The assertion that there should not be a measurable difference in pressure measurements taken before and after the filter drier is true in an ideal scenario. A properly functioning filter drier is designed to allow refrigerant to flow through with minimal resistance and should not impede the system's pressure significantly.

When a filter drier is operating effectively, it is expected to remove moisture and contaminants without creating a noticeable pressure drop. Significant pressure differences could indicate issues such as blockage or improper installation of the filter drier. Thus, if the filter drier is functioning correctly, the pressures measured before and after should remain essentially equal, affirming the statement's validity.