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  1. Replies
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    Had he been a bit more skilled, or motivated,...

    Had he been a bit more skilled, or motivated, with a multimeter he may have narrowed the list quickly to one data point.
  2. ^ ^ ^ ^ 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.

    ...
  3. 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...
  4. RF interference with the thermostat from the...

    RF interference with the thermostat from the battery charger, possibly...
  5. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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.
  13. 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.
  17. 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...
  19. 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. 53F average dew points indicate you are removing a good amount of moisture....
  22. Thread: AC Disaster

    by Shophound
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    466

    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.
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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...
  30. Replies
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    Is the indoor humidity tracking lower since TXV...

    Is the indoor humidity tracking lower since TXV installation?
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    I would have concentrated on the return ducting...

    I would have concentrated on the return ducting prior to going with a TXV mod. That you have a 10 degree rise between the return air inlet inside the house and where this air enters the air handler...
  32. Schrader valve caps ("Freon caps") left off could...

    Schrader valve caps ("Freon caps") left off could have been by someone helping themselves to refrigerant in your system between your service calls last year and this year.

    If your east side system...
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    My statement was in context of a 105 degree day...

    My statement was in context of a 105 degree day with 98% humidity, but I see your point.
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    Yeah, and that's open up the windows and shut off...

    Yeah, and that's open up the windows and shut off the a/c weather in Texas.... :grin2:
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    These three photos tell me a lot of things going...

    These three photos tell me a lot of things going on at your house. With the assumption that in the third photo you are looking up toward the attic, notice how much dirt and dust has collected where...
  36. Residential server farm. You should definitely...

    Residential server farm. You should definitely consider treating that room like a commercial server room: separate HVAC from rest of building. A mini-split might be a good choice as it can run when...
  37. "Storage engineers"? Does that involve a room...

    "Storage engineers"? Does that involve a room with lots of computer servers or something?

    If you have a room with a substantially different heat gain/loss profile than the remaining zones served...
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    Your expectations are only misaligned if they...

    Your expectations are only misaligned if they include a free load calculation. To do such a calculation correctly, it takes time.

    Did you have a home energy audit done prior to your insulation and...
  39. This sounds more like a complaint about the...

    This sounds more like a complaint about the system's noise and location vs. sweating windows in winter.

    If the HRV solved the window sweating problem you should take up the noise and location...
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    Most contractors are understandably reluctant to...

    Most contractors are understandably reluctant to perform load calculations at no charge.

    A load calculation is preferable for new construction, for additions to existing structures, or if...
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    That's the "special" register with its "special"...

    That's the "special" register with its "special" Ak for those "special" air distribution patterns that normal registers just can't hack.
  42. Replies
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    Duct leakage test (duct blaster) can determine...

    Duct leakage test (duct blaster) can determine rate of leakage and assist in finding the leaks. Where the zip ties are used but no mastic applied are potential leak points. Where I at your house...
  43. Do your homework on bidders before you sign a...

    Do your homework on bidders before you sign a contract. Find out how well others are satisfied with their work.
  44. Replies
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    I would add checking for supply air duct leakage...

    I would add checking for supply air duct leakage to that list, and having the house blower door tested at some point.
  45. Replies
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    With return ductwork in attic I would want its...

    With return ductwork in attic I would want its entire length, and all of its connections and fittings, checked for air leakage. Even with your recent wet weather, the intense attack against high...
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    Where is the indoor unit located? Attic, in...

    Where is the indoor unit located? Attic, in house, basement?
  47. Air handler in garage likely sucking in exhaust...

    Air handler in garage likely sucking in exhaust fumes from autos in garage. Air handlers should not be in a garage, or share a wall with one with platform return. But if it must live there then...
  48. If you've cleaned the coil and fixed the duct,...

    If you've cleaned the coil and fixed the duct, watching the system over 24 hours will determine if you've solved the problem or have more homework to do.

    No telling if the system charge was...
  49. Need to know what type of metering device is on...

    Need to know what type of metering device is on the evap coil. Allstyle coil makes me think it's a piston and if so, the orifice size of the piston should match what's stamped on the condenser...
  50. The long timeframe for duct replacement also...

    The long timeframe for duct replacement also caught my eye. Months to reduct a 4,000 square foot house? Makes me wonder if this is one of those giraffe barn type homes with lofty ceilings and framing...
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