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Condensate traps for air conditioning, refrigeration and heat-pump systems — they drain condensate from the evaporator drain pan while blocking odours, insects and uncontrolled air ingress under negative pressure. For HVAC-R installers and service technicians.
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A condensate trap creates a water seal (U-bend) or a dry seal (ball/diaphragm) between the drain pan and the waste line, so condensate drains by gravity while the fan's suction-side negative pressure cannot pull in air or stall the drain. On units with positive pan pressure it prevents water being blown out of the line, while dry-seal designs (float ball or flap) also work at low condensate rates without the water seal evaporating and letting sewer odours back into the space.
Selection starts with the unit type and the sign of the pan pressure: an evaporator on the suction side needs an adequate seal depth (matched to the fan's negative static pressure in Pa / mm H2O), whereas splits and small ducted units usually accept a compact ball trap. Check the connection size (typically 16/20/25/32 mm, threaded or hose spigot), temperature range and material chemical resistance (ABS/PP), serviceability (dismountable body, inspection plug) and the minimum required fall. For hygienic and commercial duty, a dry anti-odour seal and the ability to fit in tight space under the unit are key.