NACHI tip of the day

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#1

Originally Posted By: eharden
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Hello all,


I need a clarification on this tip. The note says “Trap required in the condensate line if the condensate drain line is under negative pressure (e.g., upstream of the blower - as shown here) a trap is required” I stared at that image for 5 minutes and still came to the conclusion that the drain line in that image is DOWNSTREAM of the blower. Am I correct in that conclusion, or do I need to go back to school?


http://www.nachi.org/bbsystem/usrimages/1241.gif

--
Eric Harden
First Choice Inspection Services

"That which does not kill me, makes me stronger."

#2

Originally Posted By: jpope
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When you travel "upstream,’ you’re going AGAINST the current (air flow).


"Down stream" is WITH the current (air flow).

Does this help.

I'm still not sure how this affects the necessity of the trap. ![eusa_think.gif](upload://lNFeGuTetUAtwNVgUSOuUzgrGGK.gif)

--
Jeff Pope
JPI Home Inspection Service
"At JPI, we'll help you look better"
(661) 212-0738

#3

Originally Posted By: kluce
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The reason for the trap is to prevent water being splashed back to the condensate pan. That is why this says the trap needs to go 4" down and 2 inches up to hold the water, but it still has 2" to go before going back into the condensate pan.


This diagram shows the 4" down and 2" up which is needed for some commercial units. The blower is so strong that this type is needed.

There is a drain trap that is used a lot. It's all one piece and more of a dip down and up. It does the same thing and works fine for residential units. If I had to guess, it's about a 2" drop and 1" rise.

The trap is used when air sucks through the A-coil.

#4

Originally Posted By: eharden
This post was automatically imported from our archived forum.


Good Gawd,


Methinks I should lay off of Mr. Kirk’s “Vicodin margaritas” icon_redface.gif Now if you will excuse me I am going to remove my cranium from my rectum and find my re-admission papers.



PS: Thank you for kicking me in the butt and shaking a thought loose.

--
Eric Harden
First Choice Inspection Services

"That which does not kill me, makes me stronger."

#5

Originally Posted By: Blaine Wiley
This post was automatically imported from our archived forum.


The rule of thumb is:


When the coil is on the suction side of the blower, the pan can hold water and therefore needs a trap in the condensate line.

Blaine