HVAC Journeyman Practice Exam

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What is the purpose of slope in condensate drains?

To allow for easy access in cleaning
To prevent backflow
To stabilize the piping
To increase pressure

The correct answer is: To prevent backflow

The purpose of slope in condensate drains is to ensure proper drainage of water by preventing backflow. Slope is an essential aspect of the design for condensate drainage systems because it facilitates the movement of water away from the air conditioning equipment or boiler. When the drains are installed with an appropriate slope, gravity aids the flow of condensate, which helps to avoid any blockage or reverse flow of water within the system. If the condensate drainage is not appropriately sloped, it could lead to water accumulating in the pipes, potentially damaging the system or causing water to backtrack into the unit. This backflow can lead to issues such as water leaks, increased moisture levels, and even mold growth if water remains stagnant. While easy access for cleaning, stabilizing piping, and increasing pressure may be considerations in different contexts within HVAC systems, they do not directly relate to the function of slope in condensate drains. Slope specifically addresses the need for effective drainage and prevention of backflow within the system.