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  1. It appears set in first photo has high return...

    It appears set in first photo has high return grill damper closed with bottom open and the other set the opposite way.

    Try the following, since it is still the winter heating season: open top...
  2. Are the low/high returns switchable via a damper?...

    Are the low/high returns switchable via a damper?

    If so, for winter heating, have you tried operating your system with in one instance only the low returns open, and in another instance only the...
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    Provided the flues for these combustion...

    Provided the flues for these combustion appliances are not blocked (which you appear to have checked), the other main cause for backdrafting combustion appliances is a pressure difference between the...
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    Fascinating. I watched the web feed of SpaceX...

    Fascinating.

    I watched the web feed of SpaceX sticking the landing in Florida. It was marvelous; it made me feel like when I was a kid watching the Apollo moon landings.
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    Looks like an old O6E Carlyle. If so, those are...

    Looks like an old O6E Carlyle. If so, those are tough pumps but can be destroyed by either too much oil in the sump, oil return problems, oil flashing off in the sump (no superheat from evap), oil...
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    Post a photo of what type of registers you have...

    Post a photo of what type of registers you have and that should kick up this conversation a notch.
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    Wait...he mounted the humidistat in the closet...

    Wait...he mounted the humidistat in the closet where air blasting out of the humidifier flows over it? If so, the stat is then controlling to humidifier output, not the house humidity level. At least...
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    If I absolutely HAD to live with that botched...

    If I absolutely HAD to live with that botched hack of a humidifier install, to give it a halfway decent shot of working properly I'd build a plenum at the return opening on the furnace bottom side...
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    Some questions: How was this boiler's size...

    Some questions:

    How was this boiler's size determined?

    How many zones are there?

    Is the boiler attempting to maintain main loop temp to the zones or is it only enabled when zones call for...
  10. Too bad no a/c system comes with a real time SEER...

    Too bad no a/c system comes with a real time SEER meter so you can see what actual SEER you get from your system vs. rated. Good installation and good, tight ducts go a lot further toward delivering...
  11. Where is the indoor section (blower, filter,...

    Where is the indoor section (blower, filter, etc.) located? Attic? Crawl space? In the house or basement?

    Carrier's heat output numbers at 5F outdoor air temperature were likely obtained with...
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    Get a blower door test done as part of your...

    Get a blower door test done as part of your energy audit. A blower door will give you a number like xxxxCFM@50 pascals. If that number is considerably higher than the square footage of your house,...
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    Boilers are always happiest when they are sized...

    Boilers are always happiest when they are sized correctly and have a simple setpoint like water temp to maintain. Buffer tanks only help this more.
  14. If it's running in a/c mode with low outdoor...

    If it's running in a/c mode with low outdoor ambients, head pressure will be down and there won't be as much mass flow of refrigerant through the evaporator. Combine that with low indoor heat load...
  15. You are correct: if dew point remains unchanged...

    You are correct: if dew point remains unchanged but air is heated a few degrees, relative humidity will drop. Running heat does not actually reduce total moisture content, only reduces relative...
  16. I replaced the PSC motor on my then six year old...

    I replaced the PSC motor on my then six year old Rheem furnace. Nothing wrong with the PSC other than an annoying hum when it ran. I replaced it for both efficiency and noise reasons (and did it...
  17. Is the clicking in sync with the humming...

    Is the clicking in sync with the humming undulation or random?
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    Low airflow or condensate soaked cabinet...

    Low airflow or condensate soaked cabinet insulation, or both. Most likely starved for air since ductwork is what is most often done wrong on installations.
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    The pickup truck rental would eliminate the...

    The pickup truck rental would eliminate the freezer size restriction, and probably relieve your friend at the same time.

    Don't overthink this. Just get an idea how much food you plan to put in...
  20. Assuming system was in heating mode when photo on...

    Assuming system was in heating mode when photo on right was taken, liquid line service valve looks very suspect...
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    Rent a pickup truck from Home Depot and get the...

    Rent a pickup truck from Home Depot and get the freezer size you really want.
  22. Set your desired humidity level way above where...

    Set your desired humidity level way above where you would normally set it just to see if the humidifier will engage. If it does not you may need a set of experienced eyes in your homemto help you get...
  23. If a landlord is that callous about human life...

    If a landlord is that callous about human life and safety, I'd be looking for a new crib, and I'd be urging the folks upstairs with a new baby in its crib to also bail out.

    Landlord does not...
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    Bingo. File it under "painful lessons" and pull...

    Bingo. File it under "painful lessons" and pull out that file next time you go freezer shopping.

    What you have now is pretty much temporarily running scrap. I'd cut bait and move on. Buy NEW from...
  25. I would never discount a potential carbon...

    I would never discount a potential carbon monoxide concern with any combustion appliance, but in the case of a furnace with a cracked heat exchanger the primary concern I have with that situation is...
  26. The more airtight a house becomes the higher the...

    The more airtight a house becomes the higher the indoor humidity levels will consistently track. At my own house, prior to undertaking extensive air tightening efforts, my indoor humidity levels ran...
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    You can use water based duct mastic, fire...

    You can use water based duct mastic, fire caulking, or expanding foam, depending on the type and size of the leak. With expanding foam, a little goes a long way, so if you use it be careful how much...
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    Fiberglass insulation does NOT stop airflow. ...

    Fiberglass insulation does NOT stop airflow.

    Repeating: fiberglass insulation does NOT stop airflow.

    One more time: fiberglass insulation does NOT stop airflow.


    I only speak in this manner...
  29. If the return ducting wasn't properly connected...

    If the return ducting wasn't properly connected to the air handler, the blower was pulling in humid air from the attic along with whatever air made it back to the air handler from the house. This...
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    Call for service. Sounds like an ignition...

    Call for service. Sounds like an ignition problem. Take no chances with LP equipment and have it serviced by someone competent in LP service procedures.
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    Provide conditioned air after final inspection....

    Provide conditioned air after final inspection. Just a small tap off the air handler in the attic will do fine.
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    If ducts are in attic, foaming roof deck moves...

    If ducts are in attic, foaming roof deck moves ducts within both thermal and pressure boundaries of building envelope. It reduces radiant gain through roof deck but can slightly increase overall heat...
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    Provide CONDITIONED air, not FRESH air. FRESH air...

    Provide CONDITIONED air, not FRESH air. FRESH air defeats the purpose of having a sealed attic. You can bring fresh air into the house via mechanical ventilation.
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    Plan to provide a small amount of conditioned air...

    Plan to provide a small amount of conditioned air to the sealed attic to keep humidity in check.
  35. That you smell the air freshener you sprayed in...

    That you smell the air freshener you sprayed in the mechanical room whenever your HVAC system runs says two things:



    You have duct leakage on the return side of the system
    If any odors from...
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    Combustion analysis on furnace if that is what...

    Combustion analysis on furnace if that is what you have. If ducts are in attic or crawl space it's possible a critter got inside the ducts and relieved itself. But if you have a gas burning furnace,...
  37. "Stack effect" would explain the motive for odors...

    "Stack effect" would explain the motive for odors from below entering your unit when your HVAC system is not running. A condo building three stories tall, with the lowest story a partial or full...
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    Order of progression; from less to more...

    Order of progression; from less to more expensive:

    1) Contractor to remove blower assembly and check motor bearing play. If motor passes check, contractor to clean blower wheel, reassemble, and...
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    Re: ceiling cracking; if you live on expansive...

    Re: ceiling cracking; if you live on expansive clay soil like much of Texas is composed of (I have it under my home in North Texas) your house foundation may be moving, which is stressing the framing...
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    I would look for an alternate route for the...

    I would look for an alternate route for the piping and wiring; I know you said the trunk was the only route. But, wiring inside a moving air stream is not a happy coupling. Air flowing through a...
  41. The decision on whether the forced air system...

    The decision on whether the forced air system should provide heat via heat strips or the stratified air at ceiling peak would require a control sequence in the manner of: if "return air temp" is = to...
  42. If the rate of supply duct leakage is greater...

    If the rate of supply duct leakage is greater than return air duct leakage, the room will still go negative if the ducts are not within conditioned space.
  43. Replies
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    If you have cold air spilling downstairs from the...

    If you have cold air spilling downstairs from the top floor, you have a building air leakage problem. It is hard to combat this with forced air heat or the baseboard heat. It's better to find the air...
  44. Do you ever see any condensate leaving the unit...

    Do you ever see any condensate leaving the unit via a condensate drain or pump?



    Of course heat mode will dry off the coil, because it raises the temperature of the coil. That's not normally...
  45. Are you both comfortable with the thermostat set...

    Are you both comfortable with the thermostat set as low aa it will go, even though it displays the temperature inaccurately?
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    Oh, and as used on the site, the graphic below...

    Oh, and as used on the site, the graphic below caught my eye:

    https://blog.ecoventsystems.com/wp-content/uploads/2015/02/all_pressures-300x178.jpg

    Here's a brief lesson in data interpretation...
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    TESP is Total External Static Pressure, which is...

    TESP is Total External Static Pressure, which is the sum of two measurements: for a furnace there is one measurement taken downstream of the filter inside the furnace, and upstream from a cooling...
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    Some of the verbage found at that link just sent...

    Some of the verbage found at that link just sent my BS meter needle not only pegging, but wrapping itself around the peg so many times I lost count.

    Weather patterns causing a sharp rise of...
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    Yes, no disagreement there concerning...

    Yes, no disagreement there concerning "assumption". I clearly delineated that in my first reply above.

    However, the PREMISE is what concerns me more than any control sequence assumption....
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    See my responses within your quote below: ...

    See my responses within your quote below:



    The Ecovent website is not very forthcoming about how each individual device measures pressure in the duct. It mentions a "hub" that talks to all of...
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