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  1. Replies
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    Now that you've posted the above, I'm interested....

    Now that you've posted the above, I'm interested. :putergreet:

    Sounds to me you're suffering from typical two story summertime reverse stack effect. What!? You say? :)

    Explanation: In summer...
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    Tell me how we can field measure SEER and then we...

    Tell me how we can field measure SEER and then we can tinker with suction temps to see which way the SEER meter tracks.

    I swear somebody once gave me a SEER meter, but I just can't find it... :)
  3. Here's one possible scenario: a mini-split is...

    Here's one possible scenario: a mini-split is cooling one room where an occupant is. There are other mini-split heads throughout the house, but only the one where the person is seated is operating....
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    See my responses in red inside your quote below:

    See my responses in red inside your quote below:
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    If you can track/log your nighttime a/c run time...

    If you can track/log your nighttime a/c run time along with temperature and humidity levels, you may then see the corelation between run time and humidity control.

    TB is correct: a/c run times...
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    Basic answer for non airconditioned, unoccupied...

    Basic answer for non airconditioned, unoccupied house with all windows and doors closed at peak daily solar insolation:

    heat gain to structure interior air from ceiling, walls, windows, doors -...
  7. Thread: Cheese Boxes

    by Shophound
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    Sealing up a duct system that may already be poor...

    Sealing up a duct system that may already be poor at flowing the right amount of air through the system can make things worse.

    Have the engineer check total external static pressure at your air...
  8. Run caps can't shed heat as good as they once...

    Run caps can't shed heat as good as they once did. The old ones were oil filled, which was great, but that oil had PCB, which is bad. Heat kills capacitors.

    Reconditioned run caps? Unlikely. No...
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    You may be right that the wiring is 24 volts....

    You may be right that the wiring is 24 volts. From where I sat I could also have said that, but I had no confidence in what it was, in spite of what it appears to be in the photos.

    Also, under...
  10. The leak or leaks do not have to be large for you...

    The leak or leaks do not have to be large for you to feel the air at the ceiling fan junction box. That you feel cool air at the same time the downstairs a/c unit runs leaves little doubt as to the...
  11. My thoughts? That tech needs some buildin'...

    My thoughts? That tech needs some buildin' science learnin'...

    Attics aren't ventilated to reduce heat. That's a misnomer. They are ventilated to keep the roof deck from rotting out in winter....
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    Do not touch the wires. Your a/c condensate...

    Do not touch the wires.

    Your a/c condensate pan may be backed up and overflowing. If it's not, then the condensation is a poor insulation problem. Either way you should engage your HVAC person to...
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    I can't believe what my eyes are seeing. A...

    I can't believe what my eyes are seeing.

    A competent licensed electrician should be engaged to straighten that electrical wiring mess out. Period.

    Strike that.

    I think you need to go ahead...
  14. Thread: Cheese Boxes

    by Shophound
    Replies
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    "Cheese box" is a great name for a terribly...

    "Cheese box" is a great name for a terribly non-aerodynamic fitting in a duct system.

    You want to minimize turbulence at duct fittings. These cheese boxes are far from that goal.
  15. *Sigh*. So often, both in the world of...

    *Sigh*. So often, both in the world of automotive repair and in home construction, the phrase "it's normal" translates to "I don't know how to deal with it, or don't want to". I realize that sounds...
  16. There certainly is a reason for it. I will make...

    There certainly is a reason for it. I will make another assumption that the ducts that serve the downstairs rooms are not within the house; i.e. they run either in a crawl space, basement, or in...
  17. I will assume for the moment that in your effort...

    I will assume for the moment that in your effort to cool the downstairs to 79 and unable to drop its temp below 81, the downstairs unit runs constantly.

    I will further assume that the upstairs...
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    Thread Recap

    I took liberty to review this thread to see if in our collective efforts some items raised potentially escaped our eyes. Here's a few that caught mine upon review:



    I agree these duct fittings...
  19. I agree with your assessment of our OP's crawl...

    I agree with your assessment of our OP's crawl space. I think they should all be sealed and controlled for humidity. Ventilating a crawl space in a humid climate in summer is like overflowing rivers...
  20. If you're asking these types of questions it...

    If you're asking these types of questions it seems your HVAC personnel have not won you over with their knowledge and abilities.

    True pros in any trade worry over the details, such as insulation,...
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    A compressor covered with sweat on a residential...

    A compressor covered with sweat on a residential HVAC system can be a sign of trouble: poor airflow, overcharge, or both.

    It also means you might soon eat a compressor if you don't get a sharp...
  22. Re: sand. What may appear dry to the eye may be...

    Re: sand. What may appear dry to the eye may be full of moisture for a cold surface.

    You have two approaches laid before you: either raise all surface temperatures of the insulation covering all...
  23. ^ ^ ^ ^ Times Twain Building Physics Rule #1:...

    ^ ^ ^ ^ Times Twain

    Building Physics Rule #1: Hot flows to cold.

    Only way to slow down hot flowing to cold is to use a material that slowly conducts hot to cold. AKA insulation.

    ...
  24. So many compromises in the OP's thermal...

    So many compromises in the OP's thermal boundaries, so little time...

    I just got a FLIR One infrared camera. Love it. If I walked into the OP's house and directed the FLIR toward the ceiling where...
  25. RF interference with the thermostat from the...

    RF interference with the thermostat from the battery charger, possibly...
  26. See if your thermostat "clicking" or cutting out...

    See if your thermostat "clicking" or cutting out happens at the same time a sump pump starts up. If it does it may be one or both pump motors pulling high amps at startup, causing the transformer...
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    Four tons for 1,800 square feet? I have a two...

    Four tons for 1,800 square feet? I have a two stage system (3 ton max) on 1,800 square feet in N. Texas and most of the time it runs on low stage, even when outdoor temperatures reach 100 degrees....
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    If you have condensate being drawn out of the...

    If you have condensate being drawn out of the condensate pan and collecting on the blower housing, that's a sign the return air side static pressure is too high. A dirty or overly restrictive filter...
  29. Now is the time to research, find, and build...

    Now is the time to research, find, and build confidence in a competent HVAC contractor, before excrement strikes air propulsion device.

    Most every good contractor I personally know (and I am...
  30. I can see why it would be worse, based on how the...

    I can see why it would be worse, based on how the sequence of operation above is written. Reversing valve shifts at the same time the fan and compressor noise suddenly stops. That will only make the...
  31. Me? I've used spare leads in a cable before, but...

    Me? I've used spare leads in a cable before, but only after testing each spare for shorts after finding the leads that shorted in the first place. A little time consuming but far better than smoking...
  32. The safety device for every heat pump made for...

    The safety device for every heat pump made for activating a reversing valve while the system is running is called an accumulator.

    The valve itself is cast in such a manner that if it got...
  33. Lesson for those fond of gathering wisdom: if you...

    Lesson for those fond of gathering wisdom: if you have an electrical device, and you find it hot and detect an odor of smoldering material, remove the power and seek help.
  34. Replies
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    Interesting article. A house that naturally...

    Interesting article. A house that naturally ventilates below 0.35 air changes per hour (ACH) typically needs mechanical ventilation. If you have tight construction, and by such an ERV was installed...
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    Best place to start for coil performance is...

    Best place to start for coil performance is measuring evaporating and condensing pressures and temperatures of the system refrigerant after system has run steady ten- fifteen minutes, along with...
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    This is the data my time harassed brain was...

    This is the data my time harassed brain was thinking it had this morning, but rather was your earlier supply air data. Your indoor air dew point temperature is running high (> 55^F) so either your...
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    See above.

    See above.
  38. Replies
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    Measuring the dew point temperature of the air in...

    Measuring the dew point temperature of the air in the room means the coil must be colder than that to maintain the dew point temperature observed in the room. If the building's sensible heat ratio is...
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    I use PsychroApp for iOS from Munters. For 55...

    I use PsychroApp for iOS from Munters. For 55 degrees dry bulb (discharge air temp shown on graph) and 85% RH it returns 51 degree dew point. If dew point was above 55 I would agree he's got a warm...
  40. Thirty years ago there was no SEER rat race. The...

    Thirty years ago there was no SEER rat race. The SEER game, among other factors, has changed how a/c systems are made and how they perform. Thinner copper in the coils, closer fin spacing, larger...
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    Difference between the trend for the speed tap...

    Difference between the trend for the speed tap set higher than the one above not all that significant.

    Along with my prior post on determining real time system capacity, you can check latent...
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    Your data above looks pretty much inline with...

    Your data above looks pretty much inline with what I'd expect out of a residential system with a normal load on the house. 53°F average dew points indicate you are removing a good amount of moisture....
  43. Thread: AC Disaster

    by Shophound
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    A mere academic observation, since the question...

    A mere academic observation, since the question was asked "can a 5 ton evaporator work on a 3.5 ton condenser": as others above noted, with the proper metering device a five ton coil can get along...
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    What might be helpful with the dew point data...

    What might be helpful with the dew point data shown above is if it coincided with system run time (meaning whenever compressor was on, not indoor blower, which should be in "auto"). A rough guess by...
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    By turning off your ERV and dehumidifier, you may...

    By turning off your ERV and dehumidifier, you may have reduced the run time of your a/c, since it is no longer needing to remove heat and humidity brought in from the ERV, or heat from the...
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    I can't imagine your house being destroyed just...

    I can't imagine your house being destroyed just to fix a bad duct design. Significant surgery, yes, but destruction, no. If your house is like most it's just drywall and framing studs. Both can be...
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    Yep, and with the putty removed enough air was...

    Yep, and with the putty removed enough air was entering the hole to alter the physics inside the blower cabinet, and hence no splash onto the blower housing.
  48. Replies
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    Try turning both ERV and dehumidifier off for 24...

    Try turning both ERV and dehumidifier off for 24 hours, with the a/c blower set to "auto". Run your data loggers during this process. See how humidity and CO track during this period, and post the...
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    You have both an ERV and a ventilating...

    You have both an ERV and a ventilating dehumidifier?

    If so I'd turn the ERV off in summer and just use the dehumidifier, if connected to the duct system, to dehumidify and ventilate. Set the air...
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    You seem to have a healthy curiosity on this...

    You seem to have a healthy curiosity on this subject, which I applaud. I therefore think if you want to accelerate your education regarding thermal envelopes and duct leakage, hire an energy auditor...
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