Question 192Refrigeration/AC - Assistant Engineer70% to pass
If the running suction pressure at the refrigeration compressor of a TXV controlled air- cooled refrigeration system is below normal, which of the following can be a cause?
AI Explanation
The correct answer is C) a restricted liquid-line strainer.
In a TXV controlled air-cooled refrigeration system, a restricted liquid-line strainer can cause the running suction pressure at the refrigeration compressor to be below normal. This is because a restricted strainer will impede the flow of liquid refrigerant to the expansion valve, reducing the amount of refrigerant entering the evaporator. This reduced refrigerant flow leads to a lower suction pressure at the compressor.
The other options are incorrect because: A) a dirty condenser would increase the condensing pressure, not decrease the suction pressure; B) overfeeding by the expansion valve would increase the suction pressure; and D) a refrigerant overcharge would also increase the suction pressure, not decrease it.
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