P-trap at air-handling unit drain connection
P-trap at air-handling unit drain connection
(OP)
I had always thought that P-trap at the air-handling unit condensate drain connection is needed all the time, no matter if the cooling coil is blow-through or draw-through configuration. However, in the project I am working on, I select a wall-mounted BARD unit with blow through configuration. I was asked why the P-trap is needed. My point is that P trap in the blow through configuration can prevent the cold air at the coil from escaping through the drain pipe. Am I correct here? Anyone can share your experience with BARD unit? Or could you advise anything on this P-trap topic?
Thank you so much!
Thank you so much!





RE: P-trap at air-handling unit drain connection
RE: P-trap at air-handling unit drain connection
Another engineer just told me that as long as no negative pressure at the coil connection, no need for the P-trap. I am really confused, so blow through AC unit does not need P-trap???...By the way, in the project, the condensate drain will discharge into the underground drain pipe through the air gap and hub above ground...
Thanks again.
RE: P-trap at air-handling unit drain connection
RE: P-trap at air-handling unit drain connection
RE: P-trap at air-handling unit drain connection
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RE: P-trap at air-handling unit drain connection
RE: P-trap at air-handling unit drain connection
RE: P-trap at air-handling unit drain connection
For a draw-through unit producing say,-1.5" s.p., the p-trap water seal should be a min. of 2.5" deep.
Hope this helps.
RE: P-trap at air-handling unit drain connection
RE: P-trap at air-handling unit drain connection
RE: P-trap at air-handling unit drain connection
Not meaning to sound smart-alecky, but it seems to me that its such a minimal expense.... might as well do it.
Ed
www.engineerboards.com
RE: P-trap at air-handling unit drain connection
We reviewed a project where the housekeeping pad had been deleted and the contractor attempted to use 3" of drop to trap against almost 6" of static.
The resulting 'fix' involved coring through the concrete floor and then installing a P-trap in the ceiling space of the floor below.... on 8 air handling units.
The issue was due to 'equal' product being supplied. The equal product that arrived on site was 100mm taller than the design equipment. The solution was to delete the housekeeping pad. Live and learn.
RE: P-trap at air-handling unit drain connection
A high working Sp of a AHU will blw out lots of air and creates high noise. Better to have a trap.
RE: P-trap at air-handling unit drain connection
Good point. You probably pointed out (hopefully, anyway) an extreme example of this, but something I hadn't considered.
Ed
www.engineerboards.com
RE: P-trap at air-handling unit drain connection
RE: P-trap at air-handling unit drain connection
On draw through a good point is to have a high 'stem' on the trap, refer to 'book page' 116 of my favourite link.
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Take the "V" out of HVAC and you are left with a HAC(k) job.