Question 1 of 27070
Q
An obstructed expansion valve may be indicated by an incompletely cooled evaporator and what other symptom?
A
frosting at the evaporator inlet
B
a decrease in the amount of frosting across the drier
C
a higher than normal discharge pressure
D
frosting at the suction side of the compressor
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Question 1 / 270705eccef9dbacbc34ba4d45fe3
Question 1 of 270705eccef9dbacbc34ba4d45fe3

An obstructed expansion valve may be indicated by an incompletely cooled evaporator and what other symptom?

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Question 1 of 27070
Q

An obstructed expansion valve may be indicated by an incompletely cooled evaporator and what other symptom?

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🔍 Key Concepts

• Behavior of refrigerant when it is restricted at the expansion valve • Normal location and pattern of frosting in a properly operating refrigeration system • How pressure and temperature change upstream vs downstream of a restriction

💭 Think About

• If the expansion valve is obstructed, what happens to refrigerant flow into the evaporator and its ability to absorb heat? • Where would you expect the largest pressure drop and temperature change to occur when there is a restriction at the valve? • Which symptom would most directly indicate that liquid refrigerant is not reaching the evaporator correctly?

✅ Before You Answer

• Compare where frosting normally appears in a healthy system versus where it would shift if the restriction is right at the valve • Think about whether a blocked valve would more likely raise or lower downstream pressure and how that affects frosting • Eliminate any option that describes a symptom that would result from too much flow rather than restricted flow