Which condition is addressed by condensate drain traps on draw-through evaporator coils?

Which condition is addressed by condensate drain traps on draw-through evaporator coils?

• A. High air resistance
• B. Water overflow
• C. Drainpipe freezing
• D. Low static pressure

Answer: (B)

Condensate drainage management is being tested. On draw-through evaporator coils, moisture condenses on the coil and must be removed through a drain line. A condensate drain trap creates a water seal in that line, which prevents backflow and siphoning when the system is under suction from the blower. This lets the condensate drain by gravity reliably and prevents the pan from overflowing. So the condition addressed is water overflow. The other issues—air resistance, static pressure, or drainpipe freezing—aren’t controlled by the drain trap. Airflow problems relate to how the air moves through the system, while freezing is a separate concern for the drain line in cold conditions.

Condensate drainage management is being tested. On draw-through evaporator coils, moisture condenses on the coil and must be removed through a drain line. A condensate drain trap creates a water seal in that line, which prevents backflow and siphoning when the system is under suction from the blower. This lets the condensate drain by gravity reliably and prevents the pan from overflowing. So the condition addressed is water overflow.

The other issues—air resistance, static pressure, or drainpipe freezing—aren’t controlled by the drain trap. Airflow problems relate to how the air moves through the system, while freezing is a separate concern for the drain line in cold conditions.