The suction line is sloped downwards unto the compressor for the prevention of accumulation of moisture on the downside of the walls.
How to prevent moisture accumulation?
To be able to maintain a dry surface without the accumulation of moisture on the lower walls, a downward slope is to be created between the evaporator and the compressor of such line of suction.
Hence, the way to prevent the accumulation of moisture has been aforementioned.
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