What is the purpose of an oil trap (inverted P-trap) installed at the base of a vertical refrigerant suction riser?
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A
To reduce suction line pressure drop across the riser
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B
To collect oil that drains down during the off-cycle and return it to the compressor
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C
To prevent liquid refrigerant from entering the compressor during start-up
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D
To act as a flow indicator for suction gas velocity