What is the purpose of the discharge line check valve?
A. To restrict the flow of refrigerant in the discharge line.
B. To prevent the migration of liquid refrigerant back into the compressor in the heat mode.
C. To prevent the migration of liquid refrigerant back into the compressor in the cool mode.
D. To prevent the migration of liquid refrigerant back into the compressor in the off mode.
Answer: D
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