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  1. #14
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    When he comes out, have him cut the hole in the platform the same size as the opening in the bottom of the furnace, it is really important to the airflow performance of the unit...

    Lazy slobs not cutting the return opening out full size is a pet peeve of mine...
    If more government is the answer, then it's a really stupid question.

  2. #15
    Join Date
    Jul 2008
    Location
    TX
    Posts
    32
    Thanks for the suggestion, Mark. I'll have them cut that hole out to fit better.

  3. #16
    Join Date
    Jul 2008
    Location
    TX
    Posts
    32
    Since it's summer here, I've been mostly looking at the cooling aspect of the new system. I was just looking at my system to see if I'm getting any condensation dripping into the unit after a long run and got to thinking about the vent pipe. The original rigid galvanized pipe was replaced with what looks like an aluminum flex duct. When it was installed I didn't think anything of it, but the aluminum flex looks like it would be easy to puncture. Is this the correct material for this application?



  4. #17
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,049
    Thats a flexable B vent connector.
    Its proper.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #18
    Join Date
    Dec 2002
    Location
    Rochester, MN
    Posts
    5,304
    Make sure the black insulation line is not touching the exhaust pipe, otherwise it will melt/burn the foam.

  6. #19
    Join Date
    Jul 2008
    Location
    TX
    Posts
    32
    Thanks again guys for the quick info.

  7. #20
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Sloppy, but technically correct.

    The duct connection to the top of the coil looks....interesting...
    If more government is the answer, then it's a really stupid question.

  8. #21
    Join Date
    Feb 2007
    Posts
    999
    Can you post a close-up pic of the liquid line (thin, non-insulated) where it enters the coil?

    AM

  9. #22
    Join Date
    Jul 2008
    Location
    TX
    Posts
    32
    Sure thing. Here's a shot of the liquid line and another of the ductwork above the coil.

    Not very aesthetic, but what makes that duct connection interesting?



  10. #23
    Join Date
    Sep 2007
    Location
    Just North of Dallas, Texas
    Posts
    97
    Quote Originally Posted by mallard View Post
    I've been lurking here the last couple of months to learn more in preparation for the inevitable failure of my (then) limping system. I'm not an HVAC-savvy person, just a customer.

    My old system finally failed so I just had a new one installed. The condenser, furnace and coils were replaced along with one of the line sets.

    There's a few things that concern me that I'd like to follow up with the installer but was curious into seeing what some of you experts thought.

    First, the new furnace/coil unit was roughly 8 inches taller than my old unit and the tech was not able to wrestle it into my AC closet without removing the filter base. He assured me that a filter grille would be an adequate substitute for this install. The area under the furnace is unfinished space and the tech sealed it with some kind of poly foam, caulked the furnace base and any holes for the line set or wires. The grill was installed and caulked. I'm attaching some photos. The water damage seen underneath there is years old and happened when the old unit had a clogged drain line. My main concern is that the return air going back into the furnace isn't as clean as it would be using a base-mounted filter.

    Another concern is also related to the filter grille. It uses a 12x24 filter. My old system was 2.5 tons and used a 16x25 filter. The new unit is a 3 ton system. Is this filter too small for this application?

    I'm also experiencing a weird harmonic hum that sounds like its coming from the coil. It only happens when the thermostat is set to cool. The fan setting can be either "On" or "Auto". Even when the compressor is off outside, the harmonic hum is still there. I noticed this when the tech was working on the outside unit and had the condenser safety disconnect pulled. The inside unit was on and humming noticeably even with the compressor off. The service company has contacted the manufacturer and will follow up but I was wondering if anyone here has seen this before.

    Again, I'm not very handy when it comes to these sorts of things so please forgive any descriptive errors. If more photos or information is needed, I can update this post. I did read the site rules but if this post is inappropriate in any way, please let me know.

    Thanks guys...



    I had a simular situation with my previous install. They didn't cut the opening to the AH to the proper size and I had serious air flow problems.


    That should be fixed by the installer. Get them before they get away.

    Just my 2 cents ....

  11. #24
    Join Date
    Feb 2007
    Posts
    999
    I was concerned that the liquid line might have a restriction (couldn't tell from the pic). Was not commenting on the ductwork.

    AM

  12. #25
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    This looks like a un-professional install between the brazed joints, the silicone, and overall appearance. Was this done as sidejob or a by a neighbor?
    If everything was always done "by the book"....the book would never change.

  13. #26
    Join Date
    Feb 2008
    Location
    Kansas City, Kansas
    Posts
    476
    That is a really shottie install. The 110v into the furnace not in a covering, hole not properly sized for return air, the pvc looks kinda funny, the silicone give a worse apperance. It may work, but the cosmetics of it make me think and amateur did it at best.
    Thomas aka...spymoocow
    Quote Originally Posted by garya505 View Post
    Ah, sorry I thought that's what he meant. An inch shouldn't make that much difference (at least that's what I always tell my wife).

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