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  1. #1
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    Default ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Maybe I am ignorant of just not thinking, What is this 3rd drain line on this AC. I see the main drain, the secondary and yet another one with out a PVC connection ? Look at the photo. Also, does this drain line need a PVC line that dumps into the pan ?

    Thanks

    Gene

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  2. #2
    Richard Rushing's Avatar
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Errr.... Gene, the secondary is draining into the pan.

    The primary is on the left and past the trap, there is a vent, which is capped off.

    Next one...

    Richard


  3. #3
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Gene,

    You show a running trap in your photo ( not allowed ) needs a P Trap for that installation.

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  4. #4
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Richard and Billy, I am referring to the drain opening at the far right in the photo. Is that the one you are referring to ?


  5. #5
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    This one.

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  6. #6
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Looks like an unused drain on a multi position coil. Needs to be capped.
    Were you getting air into or out of it with the blower on? If you had water there, something is not as it appears.

    Jim Luttrall
    www.MrInspector.net
    Dallas, Texas

  7. #7
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Jim, it was blowing air when the unit was on and otherwise dry. No moisture.

    Thanks

    Gene


  8. #8
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    The primary condensate line needs to be trapped "properly".

    The secondary condensate line needs to be "trapped" and "trapped properly".

    That copper stub out looks like what Jim said, and needs to be capped.

    The 'vent' (if that what it is supposed to be) going up vertically from the downstream side of the trap, looks to me like it is a 90 elbow turning back over the pan, with another 90 degree elbow turning down into the pan, and has (has had) water dripping from it. This is not going to work as a "vent", that's for sure. My guess is that the "vent" was short and it overflowed when the primary condensate line backed up, so the tech said 'I can fix that, I'll make it drain back into the pan - simple enough to do, just install 2 90 degree elbows.'

    Jerry Peck, Construction / Litigation Consultant
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  9. #9
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    What Jerry said

    The "vent" on the primary drain line needs to be taller than the overflow of the primary pan then the secondary drain needs a trap. Oh, since the pan is now rusted out, that will need to be replaced too.

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  10. #10
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    I'm confused. If the condensate lines run directly outside, why do they need a p-trap?


  11. #11
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Quote Originally Posted by Brent Crouse View Post
    I'm confused. If the condensate lines run directly outside, why do they need a p-trap?
    Brent,

    To keep air from moving into, or out of, the AHU.

    If the AHU is a blow through style, it will blow air out through those condensate lines unless there is a trap sufficiently deep enough to resist the static pressure.

    Likewise for AHU which as suck through, except that they will suck air in (instead of blowing air out).

    Jerry Peck, Construction / Litigation Consultant
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  12. #12
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Makes sense to me, thanks, Jerry.


  13. #13
    Jake Guerrero's Avatar
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Quote Originally Posted by Jerry Peck View Post
    Brent,

    To keep air from moving into, or out of, the AHU.
    What happens in the middle of January, when the trap has dried out? I think Jim L. has mentioned priming it with mineral earl (oil)..?

    Quote Originally Posted by Jerry Peck View Post
    If the AHU is a blow through style, it will blow air out through those condensate lines unless there is a trap sufficiently deep enough to resist the static pressure.

    Likewise for AHU which as suck through, except that they will suck air in (instead of blowing air out).
    I think its also known as the positive and negative pressure side(s).


  14. #14
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Quote Originally Posted by Jake Guerrero View Post
    I think its also known as the positive and negative pressure side(s).
    It is, but describing it as 'blow through' or 'suck through' makes a better visual understanding of what is going on.

    The 'blow through' is positive pressure and the 'suck through' is negative pressure.

    Plus, it not just 'positive pressure' or 'negative pressure', it's 'the static pressure' in the unit, which can be either positive or negative.

    Jerry Peck, Construction / Litigation Consultant
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  15. #15
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    Default Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?

    Worked as HVAC tech. for a couple of years 95-97. At that time we were only concerned with traps on heat-pumps with the reasoning that heat-pumps have a negative pressure or suck air at the drain opening. With air sucking into the drain line it can create an air-dam, preventing the water from draining correctly. Most of the airconditioning units have positive pressure and blow out about as hard as a nat fart after the typical 20-30' of 3/4" pipe it runs thru. Nothing wrong with trapping it but not a huge deal. (Lets em know you were looking at it when you report it.)

    As far as trapping the secondary line, it may be required by mfg. but without water or some liquid in it, it is a waste of PVC. I can't convince the homie to change the filter. Do you think he is going to crawl into an attic or crawlspace with his yuppie water bottle, to prime the trap?


    I still worry most about what can cost the most, condensate sweating at the trap. It'll get you called back to do some drywall repair!





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