The purpose of the trap in a condensate drain is to:
A) Ensure that some water is always standing in the evaporator drain pan.
B) Offset the negative pressure on the drain, which can prevent the water from draining.
C) Keep snakes and insects from crawling up the drain into the coil.
D) Provide a place for coil slime to collect so that is can be easily cleaned out.
B
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