What is the primary difference between a two-pipe and a four-pipe fan coil heat pump system in commercial applications?
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A
Two-pipe systems use refrigerant while four-pipe systems use water
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B
Two-pipe systems provide either heating or cooling at one time; four-pipe systems can provide both simultaneously to different zones
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C
Two-pipe systems are only used for cooling; four-pipe systems are only used for heating
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D
Two-pipe systems require a reversing valve; four-pipe systems do not