Commercial Refrigeration Certification Practice Test

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A walk-in freezer evaporator drain passes through a below-freezing space. What installation practice best prevents freeze-ups?

Install proper slope and heat/insulate the drain as required Reduce the drain diameter to increase velocity Route the drain upward before the trap Leave the drain untrapped in all cases

Correct Answer:

Install proper slope and heat/insulate the drain as required

Explanation:

Freezer drains require continuous drainage, proper slope, and often a drain-line heater plus insulation in freezing areas. These measures prevent water from freezing and blocking the drain.

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