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  1. Replies
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    Low airflow typically not related to high...

    Low airflow typically not related to high superheat. High superheat and high subcooling often indicate a restricted metering device, since the evaporator would be starved and liquid refrigerant wouod...
  2. Yes, there is a way to get "conditioned air"....

    Yes, there is a way to get "conditioned air". That's what a makeup air unit does. It takes 100% outside air and either cools/dehumidifies the incoming air, or heats the air, depending on time of...
  3. Ducts and air handler in the attic? How hot does...

    Ducts and air handler in the attic? How hot does the attic get during the day, even with foam insulation at the roofline? What is the humidity like in the attic?

    Reasons for asking pertain to duct...
  4. Replies
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    592

    As long as there's no wind causing positive...

    As long as there's no wind causing positive pressure on one side of the house, and negative pressure on the other, and/or any exhaust fans, clothes driers, etc. going on, and reverse stack effect is...
  5. Replies
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    Okay, so same unit serves three floors, and only...

    Okay, so same unit serves three floors, and only third floor has high humidity. How can this happen? Ruling out any potential building envelope contributors for the moment, let's assume the following...
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    All condensers die at some point. You should...

    All condensers die at some point. You should bestow a "brave soldier" award upon that old Lennox before it is carted away to the scrap yard. In the neighborhood I grew up (houses built around same...
  7. Replies
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    And people wonder why I stress whenever I teach...

    And people wonder why I stress whenever I teach how practical psychrometrics is to troubleshooting comfort problems in the field.

    This tool is one of the handiest things I have for finding...
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    212

    Fan coil unit inside the apartment itself (coil...

    Fan coil unit inside the apartment itself (coil fins and blower wheels) likely fouled with dirt and if average chilled water quality treatment for apartments is in place (meaning "none") then the...
  9. Replies
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    When the third floor unit shuts off, does the...

    When the third floor unit shuts off, does the blower also shut off?

    It's sad you haven't had any luck from those you've called. If I were there I could probably find the problem by walking around...
  10. Replies
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    494

    I never doubted the return side of your system...

    I never doubted the return side of your system may be choked, but bypassed it to address other issues.

    Balancing a duct system means installing volume dampers where the ducts take off from the...
  11. Replies
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    306

    That motor has likely been replaced at least once...

    That motor has likely been replaced at least once since 1969. Is there a label on the motor, and if so is there anything legible on it?
  12. Replies
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    494

    Your system may need an air balancing effort,...

    Your system may need an air balancing effort, where rooms with too much airflow are reduced a little in flow, allowing more air to reach the rooms with not enough airflow.

    On one of your attic...
  13. Could be the compressor contactor (a switch that...

    Could be the compressor contactor (a switch that turns the compressor on and off) buzzing. Could be the compressor itself being very loud. If the unit is less than a year old, call your installer to...
  14. Replies
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    The duct returning to the air handler should be...

    The duct returning to the air handler should be sized for the total volume of air that is supposed to flow through the air handler. Grill size is selected for net free area (amount of air that can...
  15. Thread: New AC Blues

    by Shophound
    Replies
    52
    Views
    2,277

    Please help me understand something: when you use...

    Please help me understand something: when you use the word "reputable" as applied to a company that provides services and equipment, what is your definition for that word?



    That is why it is...
  16. For this to work with a compressor that is staged...

    For this to work with a compressor that is staged (low speed/high speed) the indoor blower speed could be varied to maintain either a preferred discharge air temperature (55F, commonly) or a...
  17. Some videos that might help shed light on the...

    Some videos that might help shed light on the "FROG" (finished room over garage) problem:

    https://www.youtube.com/channel/UC9YtXgkAw5B9djEns9Hibtg
    ...
  18. A ventilating dehumidifier would appear to be the...

    A ventilating dehumidifier would appear to be the logical answer to provide fresh air and humidity control to your earth sheltered dwelling. Three tons of air conditioning is not. There is not enough...
  19. Did this condenser have a standing charge of...

    Did this condenser have a standing charge of nitrogen when you bought it?
  20. If the compressor is three phase and slowing down...

    If the compressor is three phase and slowing down prior to popping the breaker it's probably pumping against a bad restriction or closed service valve on the condensing unit.
  21. Read this article written by my friend Allison...

    Read this article written by my friend Allison Bailes about rooms over garages:
    ...
  22. As you note, rooms over garages can be difficult...

    As you note, rooms over garages can be difficult to keep comfortable, and that's mainly due to poor understanding on how to properly air seal and insulate these spaces.

    For example, you noted...
  23. Replies
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    That's a bypassing scroll, all right. To OP:...

    That's a bypassing scroll, all right.

    To OP: did tech even bother to wash out condenser coil? System may be overcharged, also, being that you had a leak and refrigerant was added without a check...
  24. Replies
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    485

    By the way, the data that can be obtained from...

    By the way, the data that can be obtained from the ecobee is VERY useful. I reviewed data from my own thermostat for yesterday, and had an eye opening experience: over a span of one hour and 15...
  25. Replies
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    Calculate all sources of heat gain in BTUH to the...

    Calculate all sources of heat gain in BTUH to the garage on what is known as a "design day" (bin data daily high temperature average for your region) and that will determine unit size. Walls, ceiling...
  26. Replies
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    Garage door insulated? If not, huge heat radiator...

    Garage door insulated? If not, huge heat radiator when sun hits it. Even if sun doesn't.

    You bought a spot cooler. It's designed to keep a person sitting right in front of it from sweating like a...
  27. Replies
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    485

    If you have a two stage system and the tech added...

    If you have a two stage system and the tech added refrigerant with the system on first stage, the charge may not be correct.

    Multi-stage systems can only be correctly charged with all stages of...
  28. Replies
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    485

    Is your system two stage? If so, Ecobee will try...

    Is your system two stage? If so, Ecobee will try to run system in first stage as long as possible before engaging 2nd stage. I have an Ecobee EB STAT 02 at home on a two stage system and 2nd stage...
  29. Replies
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    485

    Not quite sure I understand your statement "4 to...

    Not quite sure I understand your statement "4 to 5 hours to come up a degree". By the data you disclosed, your system held set point within a degree for each time it ran. Humidity levels in the house...
  30. Thread: New AC Blues

    by Shophound
    Replies
    52
    Views
    2,277

    What is sorely lacking ( but not extinct),...

    What is sorely lacking ( but not extinct), whether it be among the young or old, is those who push for true mastery of their chosen endeavor. We live in a time of countless distractions, to where we...
  31. Thread: New AC Blues

    by Shophound
    Replies
    52
    Views
    2,277

    Whatever happened to transitions?

    Whatever happened to transitions?
  32. I would ensure that everything about the upstairs...

    I would ensure that everything about the upstairs HVAC refrigerant charge and airflow volume was correct before going crazy about attic air temperatures and duct insulation levels. And even there I...
  33. Yep, a cooler upstairs than downstairs during a...

    Yep, a cooler upstairs than downstairs during a Florida summer is definitely not JUST an HVAC problem. It's likely a combination of HVAC, ducts, and building air leakage along with inconsistent...
  34. Truly variable speed complete HVAC means...

    Truly variable speed complete HVAC means compressor speed, condenser fan speed, indoor blower speed, and refrigerant mass flow are analog variable, not staged. Only with this type of system can it be...
  35. Replies
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    I am not a contractor but have friends in the...

    I am not a contractor but have friends in the area who are, and who know HVAC well. Beco Services, Rhinefort Heating and A/C, and Air Worth are three that come to mind.
  36. To make that determination I would want to know...

    To make that determination I would want to know what static pressure those honeywell damper and actuator combinations are designed to operate at, and from there measure actual static at each damper...
  37. That's actually a common actuator practice. In...

    That's actually a common actuator practice. In your case what can lead to premature failure is too much static pressure in the duct. If the gears inside the actuator are not substantial (such as if...
  38. Replies
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    1,132

    Revisitng your first post the saturated vapor...

    Revisitng your first post the saturated vapor temp not all that different from latest. What speed is your indoor fan set at? May be too much coil bypass going on. Hard to call this one without being...
  39. Replies
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    1,132

    Might be a little overcharged; saturated vapor...

    Might be a little overcharged; saturated vapor temp higher than I like to see, which results in a warmer indoor coil, which means it dehumidifies less. If the air in your house is pretty cool feeling...
  40. Residential zone damper actuators should stroke...

    Residential zone damper actuators should stroke open when a call for heat or cooling in that zone is needed, and stroke closed when the call ends. They should not be in motion otherwise.

    If the...
  41. Thank you; I appreciate your reply. You may...

    Thank you; I appreciate your reply.

    You may also wish to check out www.buildingscience.com. A lot of good, free, downloadable info there.
  42. *Sigh* Sounds like typical two story with...

    *Sigh* Sounds like typical two story with basement oversized HVAC because few really understand the dynamics behind thermal and pressure boundaries as pertaining to a house. If these are consistent...
  43. My thoughts in bold within your quoted post...

    My thoughts in bold within your quoted post below:



    You are correct. Windows are comfort investments, not so much on the energy reduction aspect. Windows directly impact what is known as the...
  44. Eehome, A friend of mine, Nate Adams, runs a...

    Eehome,

    A friend of mine, Nate Adams, runs a successful home performance business in Cleveland, Ohio. He saw your post but cannot reply directly to you here, so I am enclosing his thoughts below:
  45. You're welcome. However, that still does not...

    You're welcome.

    However, that still does not explain why the putty was blown out and your siding is bulging out, and that it appeared to coincide with a loud bang and your a/c unit shutting off at...
  46. I live in Fort Worth and have hands on experience...

    I live in Fort Worth and have hands on experience with taking a 57 year old mid-century modern house that was leaky and marginally insulated, and not easy to heat or cool and turning it into a house...
  47. Just a guess: line set vibration either rubbed...

    Just a guess: line set vibration either rubbed through sealtite conduit and shorted electric feed to outdoor unit, or there's a nasty surprise under that siding in that the sealtite goes into the...
  48. Replies
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    Superheat still seems a bit high. Is the system...

    Superheat still seems a bit high. Is the system cooling the house better now that refrigerant has been added?

    I'll bet a nice steak dinner that the ductwork attached to that new Goodman 5 ton is...
  49. Does it smell burnt where the wall is bowed and...

    Does it smell burnt where the wall is bowed and the putty-like sealant is blown out?

    If the siding wasn't bowed out prior to the "pop" incident and the "pop" incident coincided with the breaker...
  50. You are better off choosing a temperature you are...

    You are better off choosing a temperature you are comfortable with and setting the thermostat to that, and then leaving it alone. Believe it or not, it will cost you less to leave the thermostat at a...
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