Residential HVAC Installation Practice Exam

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What does a trap in the condensate line prevent in an HVAC system?

  1. Condensation buildup

  2. Air circulation

  3. Heat loss

  4. Air from being drawn up into unit from the end of the drain

The correct answer is: Air from being drawn up into unit from the end of the drain

A trap in the condensate line prevents air from being drawn up into the unit from the end of the drain. Without a trap, negative pressure in the HVAC system could potentially draw air into the unit, causing inefficiencies and potential damage. This is why having a trap in the condensate line is crucial for the proper operation of the HVAC system. Condensation buildup is not the correct answer because a trap does not specifically prevent condensation; its main purpose is to prevent air from entering the unit. Options B and C are not directly related to the function of the trap in the condensate line.

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