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  1. Replies
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    See first post. Like I said, the bullet item's...

    See first post. Like I said, the bullet item's first sentence is directly contradicted by the last sentence, which is not really relevant as my system only requires one filter, not two, but it's the...
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    In a separate Goodman "Service Instructions"...

    In a separate Goodman "Service Instructions" manual, I found:



    So I believe what I wrote earlier about (return, transition duct) is correct WRT using the Goodman CFM chart. I also found:


    ...
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    Static pressure - where to measure?

    My system is set up like this:

    return --> furnace --> transition duct --> coil --> plenum

    My Goodman manuals relate "External static pressure" and "Coil drop" to CFM, but they fail to indicate...
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    This is the one (TX5N2): Removed link to...

    This is the one (TX5N2):

    Removed link to direct purchase site.

    The bottom picture has a very clear view of the little tube with the blue cap.
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    Yes, very much so. It was making good contact and...

    Yes, very much so. It was making good contact and strapped in properly with the copper strap which was also making tight contact.

    Q: There is a short tube sticking out of the bulb next to the...
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    Can you explain the condenser split? Did you make...

    Can you explain the condenser split? Did you make an arithmetic error on the indoor?



    His other thought was that the coil guy might have left the orifice in place, but he settled on the TXV as...
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    Tech came yesterday. His measurements: 80 198...

    Tech came yesterday. His measurements:

    80 198 PSIG (47 100 temp per PT chart)
    51 98 TEMP
    3 SH 1 SC (per his electronic meter)
    73 63 Split (inside)

    Diagnosis: Bad TXV. Nothing changes when...
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    The problem is I just paid for the installation...

    The problem is I just paid for the installation of the second warranty replacement evaporator coil in 5 years, and the system is back to its usual mediocre performance.

    As for what it does on...
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    I foil-taped wherever I could feel a leak and...

    I foil-taped wherever I could feel a leak and then looked for leaks (both in and out) with a stick of burning incense and taped those. The last two I remember finding were small input leaks at the...
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    So the numbers at 1 PM on this sunny day after...

    So the numbers at 1 PM on this sunny day after the AC was running 45 minutes are:

    Condenser exhaust: 100.6
    Outdoor: 88.6
    Indoor: 71.7
    Indoor RH: 52%
  11. Replies
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    I was just giving you the first numbers in the...

    I was just giving you the first numbers in the table. I have no idea what the actual values are in my installation. Here's the whole table for "MED":

    Med
    3.5 (Tons AC)
    0.1: 1,676 (CFM) 31 (Temp...
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    It's a GSC130421A (mis)matched to a CSCF4860N6A,...

    It's a GSC130421A (mis)matched to a CSCF4860N6A, which Goodman says are 13.5 SEER when combined. The original documentation said the coil was "5 tons", but revisions describe it as "4-5 tons". The...
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    It's QuietFlex brand with a silver jacket. I...

    It's QuietFlex brand with a silver jacket. I believe it's this "'RIP STOP' Silver Jacket" product, same specs, same appearance:

    http://www.quietflex.com/pages/products_silverjacket.html


    ...
  14. Replies
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    593

    The coil case is indeed insulated. Any other...

    The coil case is indeed insulated.

    Any other symptoms of contamination? Any way to test? FWIW, I am getting a 20F split across the coil, as measured with digital thermometer through holes in the...
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    The system had been running for a couple of hours...

    The system had been running for a couple of hours before I took the temps around noon. I let it run an additional hour after reducing the blower speed. It maintained that very slightly lower temp...
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    Maximum delta T?

    After having my evaporator coil replaced for the second time in five years due to a leak, I'm again obsessing over my HVAC system, with it's R4.2 flex duct suspended from the rafters in a stinking...
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    New evaporator coil, new noise

    I recently had my evaporator coil replaced due to a leak, and the new one is making some noise I wasn't hearing before inside the house. When it starts up, it makes a steady wind or running water...
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    There are four 7" supplies behind that door,...

    There are four 7" supplies behind that door, which is a hollow door with 2 column by 3 row decorative rectangular carvings embedded in it. I don't think a grille would work in it. I did a coarse test...
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    Door undercut maximum?

    To help with a return insufficiency, what's the most you would undercut a bedroom door with tile on one side, shortish carpet on the other, such that it wouldn't look stupid, compromise privacy, etc?...
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    Got it fixed today. Apparently, it was just a...

    Got it fixed today. Apparently, it was just a faulty board.
  21. Replies
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    Fried Goodman control board

    Nearly 5 y/o Goodman system. Last week I turned the gas furnace on for the first time this year and let it run 20 minutes. Worked fine, so I turned it off and didn't use the HVAC system at all for...
  22. Replies
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    The evaporator coil is what the tech said was...

    The evaporator coil is what the tech said was probably leaking. I only updated the thread to relate the new information about the leaking "condenser service valve", which was noted on a receipt 4...
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    I have about six months left on the warranty, and...

    I have about six months left on the warranty, and I actually brought this up. We talked about doing it at the winter maintenance, before it gets too cold outside. However, I don't know if it would...
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    I declined the leak test this time. I wasn't in...

    I declined the leak test this time. I wasn't in the mood to hear I might need a new evaporator coil after replacing the three y/o original coil just a couple years ago. Plus, it's late in the season.
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    Still going strong 3 weeks since the 3 pounds,...

    Still going strong 3 weeks since the 3 pounds, knock on wood.

    When I was filing my receipt for the latest service call, I went through my old receipts, and the very first one from several years...
  26. Replies
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    Well, the condenser is accessible to everyone,...

    Well, the condenser is accessible to everyone, and given the arm and a leg 3 lbs of R22 cost me, I'd be surprised if it wasn't a big theft target.

    The tech was really surprised at it being low 3...
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    I think he's a very good tech. World of...

    I think he's a very good tech. World of difference between him and the original installers. Anyway, I'm going to hope that these valves got bumped or something when the condenser housing was removed...
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    Yeah, I wish I'd done the leak test. Now I can...

    Yeah, I wish I'd done the leak test. Now I can only wait for it to recur, and I know it almost certainly will recur. It's been good for a couple of weeks so far.
  29. Replies
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    Yeah, he mentioned that. He initially thought the...

    Yeah, he mentioned that. He initially thought the charge might be just a little off, so I declined the leak test, partly due to it being late in the season, and also because it made me too mad at the...
  30. Replies
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    The year old evaporator coil was spotless and...

    The year old evaporator coil was spotless and needed no cleaning, and the condenser coil had been cleaned a few weeks prior and was still spic and span. Air flow and everything else was fine. Then...
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    Charge question

    How would an otherwise properly functioning 3.5 ton system for a 1600 ft^2 home be expected to perform when undercharged 25-30% in 95F 70% humidity conditions? Would it be cooling at all? Freezing...
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    Thanks for the link. I don't know if I could...

    Thanks for the link. I don't know if I could increase the undercut enough to make a significant difference. When the door is closed, you can really feel the air being sucked from underneath it and...
  33. Replies
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    Are any of your inside (e.g. bedroom) doors to...

    Are any of your inside (e.g. bedroom) doors to rooms with supply vents closed? If so, and there is insufficient return path for the air in those rooms, your A/C will make up the difference by pulling...
  34. Replies
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    Cellulose, actually, at R-38.

    Cellulose, actually, at R-38.
  35. Replies
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    Is there any point in sealing the penetrations if...

    Is there any point in sealing the penetrations if they're already covered by blown-in insulation?
  36. Replies
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    5,820

    I recently installed a Honeywell 24x24 Merv 10 4"...

    I recently installed a Honeywell 24x24 Merv 10 4" filter of the type you described. It solves two problems for me:


    The "top-of-the-line" 1" Filtrete filter apparently was too restrictive,...
  37. Replies
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    The A/C guy was out a few days ago, and he...

    The A/C guy was out a few days ago, and he verified the blower is set to "high". He measured temps, found the same things I reported here, and took the results back to his boss for review.
  38. Replies
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    For the third time, "When I first started...

    For the third time, "When I first started investigating this, I was sticking a thermometer up inside the grills into the ducts, but that was becoming a real pain. The Fluke gives results consistent...
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    Doors only get shut for extended periods at...

    Doors only get shut for extended periods at night. When I said the door undercut appeared adequate, I meant that it couldn't be higher without looking odd.



    Replacing a pleated filter with a...
  40. Replies
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    I've thought about adding a return to the master...

    I've thought about adding a return to the master bedroom, considering there is a major draft under and all around the door when shut and the blower is running. In addition, the noise level in the...
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    Return is 24x24", and there are 11 7" ducts...

    Return is 24x24", and there are 11 7" ducts throughout the house. The installer was out here a couple of weeks ago for this, and he added some refrigerant. He's supposed to come back and reassess...
  42. Replies
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    Will ask the HVAC guy about the drop. Concerning...

    Will ask the HVAC guy about the drop. Concerning the noise, it's the return that has a lot of air noise. It's constructed of a metal box attached to the blower; the blower intake is oriented...
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    Per my original message, 130F on a sunny day...

    Per my original message, 130F on a sunny day (outside temp upper 90's). At night, it's about 10F higher than the outside temperature, and it cools pretty rapidly once the sun goes down.
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    Well, I don't have the experience to look at the...

    Well, I don't have the experience to look at the whole system and judge it, but there are a few unnecessary bends. For example, the duct I detached from the air handler to measure temps was clearly...
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    I know it's a little complicated, because per my...

    I know it's a little complicated, because per my original message, the vast majority of the heat gain appears to occur over the first six feet. (That doesn't surprise me, though the amount of the...
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    Well, that's not gonna happen. :) What might be...

    Well, that's not gonna happen. :) What might be possible is to replace the existing R4.2 flex duct with R8 flex duct on a gradual basis. The thing is, I don't know if that would make much difference,...
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    Then it's a pervasive problem, because all 11...

    Then it's a pervasive problem, because all 11 ducts suffer from it, and it increases with duct length.

    What about the insulation issue? I realize I didn't provide the air flow rate, which I have...
  48. Replies
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    Like I said, "When I first started investigating...

    Like I said, "When I first started investigating this, I was sticking a thermometer up inside the grills into the ducts, but that was becoming a real pain. The Fluke gives results consistent with the...
  49. Replies
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    Sorry, I don't understand. I thought a 22-25...

    Sorry, I don't understand. I thought a 22-25 degree drop across the coil was nominal.



    The filter is brand new, and the A/C unit is 8 mos old. This is new construction. I've wondered about the...
  50. Replies
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    I'm using a Fluke IR thermometer. When I first...

    I'm using a Fluke IR thermometer. When I first started investigating this, I was sticking a thermometer up inside the grills into the ducts, but that was becoming a real pain. The Fluke gives results...
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