Mechanical · M-DPJ47

Draw-Thru Cooling Coil Condensate Trap

Elements

Floors / Slabs Drainage Connections / Plates

About this detail

Condensate trap piping configuration for draw-through cooling coils in air handling units, rooftop units, fan coil units, and heat pumps. The assembly features a drain line connected to the unit condensate drain pan, extending past a threaded bronze cleanout plug, and routing through a vertical drop leg and trap elbows. A vent open to the atmosphere extends upward from the downstream side of the trap, and a threaded bronze plug is provided at the horizontal cleanout. Piping must match the size of the equipment condensate drain connection, and the horizontal run must maintain a minimum slope of 1/8 inch per foot toward a floor sink or air gap fitting. Minimum dimensions for AHU and RTU installations require dimension A at 4 inches, dimension B at 2 inches, and dimension C at 3 inches, while fan coil units and heat pumps require dimension A at 3 inches, dimension B at 1-1/2 inches, and dimension C at 2 inches. An alternative trap configuration incorporates a unit total static pressure plus a minimum of 1/2 inch for dimensioning the drop leg height. Fan coil units and heat pumps with overflow drain connections require piping to an approved location or as shown on the drawings.

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