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  1. Replies
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    If your outdoor unit is 13 SEER and the indoor...

    If your outdoor unit is 13 SEER and the indoor air handler and coil is 10 SEER, I think it's a safe bet the indoor section is older than seven years. And with that said, the drain pan could be rusted...
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    1,902

    My understanding is that from 3,000 foot...

    My understanding is that from 3,000 foot elevation and less, one can stick with sea level based psychrometrics. 1,400 feet in elevation very modestly moves the needle, IMO, and to what extent it...
  3. Replies
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    If the air handler is a draw-through, with the...

    If the air handler is a draw-through, with the evaporator coil on the suction side of the blower, there must be a trap on the condensate drain, and it must work properly, to prevent the air handler...
  4. If in the end they told you the capacitor was...

    If in the end they told you the capacitor was bad, the tech should have caught that the first day by checking the capacitor with his meter. Experienced techs can also look for indications a blower...
  5. Replies
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    1,902

    As Ikapigian said, the drop size will depend on...

    As Ikapigian said, the drop size will depend on the system tonnage requirement. For Vegas, your very same house might require a five ton system. For coastal California, maybe a three ton, or lower.
  6. So, on System "B", the actuator, attached to a...

    So, on System "B", the actuator, attached to a damper within the duct, I assume, modulates to control duct static pressure? If so, I'm wondering if you mean "transducer" instead of "potentiometer"....
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    In order for a 4 ton system to flow enough air at...

    In order for a 4 ton system to flow enough air at 1,600 CFM through a round duct, and the velocity remain at or below 700 FPM, the duct diameter should be at least 20".

    At 17", if this is your...
  8. Replies
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    For a lively discussion regarding powered attic...

    For a lively discussion regarding powered attic ventilators, check out this link:
    ...
  9. You can save some cash on the second tier...

    You can save some cash on the second tier systems, but if they are installed at a third tier or worse level, you won't even get second tier performance from them.

    There are differences among...
  10. Thread: New HVAC

    by Shophound
    Replies
    19
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    698

    This is why it is important to press for specific...

    This is why it is important to press for specific information to be included in any contract you enter into with a major purchase such as this. Yes, it is understandable you were depending on your...
  11. Thread: New HVAC

    by Shophound
    Replies
    19
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    698

    Look at your contract. Does it specify a certain...

    Look at your contract. Does it specify a certain combination of equipment? If so, is that what is installed?
  12. I once stayed at a hotel that had a PTAC (wall...

    I once stayed at a hotel that had a PTAC (wall unit, like yours) that drove me crazy. Every few minutes it made a distinct "tick" sound, whether the unit ran or not. Even leaving it off for...
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    If you want a comprehensive solution, you need to...

    If you want a comprehensive solution, you need to go find where all the moisture (humidity) sources are, whether they be originating inside the house, or coming into the house from moisture sources...
  14. Thread: XL20i noise

    by Shophound
    Replies
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    2,037

    Throughout this entire thread, unless I missed...

    Throughout this entire thread, unless I missed it, has been no effort by anyone looking at your system to measure total external static pressure (TESP), which, in this case, would be done with all...
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    I'm thinking the house might be 14 x 62, yielding...

    I'm thinking the house might be 14 x 62, yielding 870 square feet per floor. Of course, we are going off Zillow info, not real time info. Also, OP did not say what tonnage a/c system is.
  16. Replies
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    Here's a house and a client crying out for...

    Here's a house and a client crying out for someone who can perform both a building envelope and HVAC system performance analysis. The OP's stated goals are improved efficiency of his system; I...
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    Not to steal TB's thunder, but this is what I'd...

    Not to steal TB's thunder, but this is what I'd be looking for: 4.5 x delta H x CFM = BTUH total. 0.68 x delta GR x CFM = BTUH latent. 1.08 x delta T x CFM = BTUH sensible.

    The delta H...
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    Better windows are a poor money saving choice in...

    Better windows are a poor money saving choice in terms of energy cost reduction. The return on investment is very slow.

    That said, they can be comfort boosters. If you have a room with a large...
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    *Sigh* I keep seeing more and more complaints...

    *Sigh* I keep seeing more and more complaints like the OP has show up here in AOP.

    It's past time we took duct and building leakage seriously, along with correctly sizing the a/c for the expected...
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    Encapsulating crawl space the way to go, but only...

    Encapsulating crawl space the way to go, but only after external water intrusion pathways eliminated.

    A high infusion of moisture into a house can reduce the sensible cooling capacity of the HVAC...
  21. X2 ^^^^ Sounds like a water source heat...

    X2 ^^^^

    Sounds like a water source heat pump, and if so I'd want to know what temps the building loop runs at as part of my compressor failure investigation.
  22. Replies
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    3.5 tons for 1,500 square feet in Texas? If it is...

    3.5 tons for 1,500 square feet in Texas? If it is the typical Texas install quality, it is the installation that is likely sucking delivered capacity away from your system. Duct leakage, already...
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    I can't see how the refrigerant "checked as full"...

    I can't see how the refrigerant "checked as full" if you can't get the house down to 76 when outdoor temp is at 80. Without more data we can't expand much on what you've given us. I'd get a second...
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    The only way to be definitive about this is to...

    The only way to be definitive about this is to have a sharp technician measure the total external static pressure (TESP) of your furnace, and compare it to what the manufacturer recommends the...
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    If you have an ECM motor on the furnace, high...

    If you have an ECM motor on the furnace, high duct static pressure can contribute to premature ECM motor failure.

    If you have a PSC motor on the furnace (has a capacitor), and it hasn't failed...
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