Why do we need a "U" trap in the drain line of Air Handlers?

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Why do we need a "U" trap in the drain line of Air Handlers?

2006-07-09 23:32:30 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Engineering

2 answers

Coils are generally placed in the suction side of the fan of an AHU. So, in the absense of a trap, air will be sucked into the AHU instead of water flowing out. The difference between the two legs of a P trap, if equals the static pressure of the fan, water won't be lifted and you can ensure water flow out and also restrict air flowing in.

2006-07-09 23:38:06 · answer #1 · answered by absolutezero 2 · 0⤊ 0⤋

It's a moisture trap. Being heavier than air, any water is held in the trap.

2006-07-10 12:48:17 · answer #2 · answered by dmb06851 7 · 0⤊ 0⤋