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  1. Replies
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    The duct system has to be properly designed in...

    The duct system has to be properly designed in respect to the individual layout situation to achieve an even balanced airflow.

    If the airflow is balanced, then the ducts may be losing too much...
  2. Get some there to help & do a Free load-calc....

    Get some there to help & do a Free load-calc.
    http://www.loadcalc.net/

    A 1.5-Ton might do the job better(?)
    That will help make the filter area & duct system function better.
  3. Personally, for a number of reasons I would not...

    Personally, for a number of reasons I would not convert a furnace that old to LP.
  4. I should have given you this information on my...

    I should have given you this information on my first post.

    A medium efficiency filter, a Merv-7 economy extended surface 'pleated' filter, manufactured by Flanders Precisionaire; a 24 x 24 x 4"...
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    If the inducer housing was filled enough with...

    If the inducer housing was filled enough with water, why didn't the inducer pressure drop enough to open the pressure switch? Or, did it open?
  6. Replies
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    So, the N/O pressure switch closes initially then...

    So, the N/O pressure switch closes initially then opens?
    Does it open again every time & about at the same runtime?

    Does it cut off when the furnace blower starts?

    There are many differing...
  7. Well, we do not know where you live, however, a...

    Well, we do not know where you live, however, a 2000 ft. home might require airflow volume of around 1800 CFM.

    That being the case you will usually need at least two very large filter rack areas...
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    IMO, it may pay you to do a free-on-line...

    IMO, it may pay you to do a free-on-line load-calc to compare to what they may do, as some might fudge the calc.

    Get others to help you to make the calc easier to do; don't fudge it.
    Do it...
  9. The Static Pressure differential is what makes...

    The Static Pressure differential is what makes air flow, therefore, when the static pressure drops in the Plenum then the airflow would be at a reduced CFM flow rate volume; and not at the same CFM...
  10. Replies
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    There is very low airflow with a low temp-rise;...

    There is very low airflow with a low temp-rise; should be a high temp-rise with low airflow.

    Check every way possible for a return air leak to outdoor temp; something is dropping the temp-rise...
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    NO PROBLEM, lions_lair; the more information on...

    NO PROBLEM, lions_lair; the more information on airflow problems the better...
  12. Replies
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    The other, perhaps less expensive way, would be...

    The other, perhaps less expensive way, would be to install a short-damper-duct on the take-off of the large duct, then damper it down enough to raise the static pressure to the small duct opening...
  13. Replies
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    The locations of the take-offs could be part of...

    The locations of the take-offs could be part of the problem; IMO, the closest one to the blower would probably especially not have as much velocity or, static pressure on it.

    Just my opinion; The...
  14. Probably not... What speeds do you have to...

    Probably not...
    What speeds do you have to select from?

    Ask your HVAC contractor; since you may not know how to deal with the situation, ask them to do it for you.

    They should have performed...
  15. You would simply select blower speeds that would...

    You would simply select blower speeds that would deliver less velocity & around 800-CFM; shouldn't be a problem. Select diffusers that provide the proper throw at those velocities...

    The problem...
  16. They should fix any damage they caused. At...

    They should fix any damage they caused.

    At the take-offs of the branch duct runs, dampers can be installed to adjust the balance airflow to some degree...

    IMO; For the size of your home, if...
  17. What is the design temps in your Southern CA...

    What is the design temps in your Southern CA climate area; 1600-sf may not need a 3-Ton A/C; a 2-Ton might handle the cooling comfort.

    Do a little retro-work if needed to make smaller equipment...
  18. Replies
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    I had a situation with my condensing 95% furnace...

    I had a situation with my condensing 95% furnace with a bad mold odor all through the house & condensate pump was cycling often & tube not draining properly; though Furnace did not shut down.
    ...
  19. Replies
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    Is the furnace a high efficiency condensing...

    Is the furnace a high efficiency condensing furnace?
    If it is; is the condensate being effectively drained?
  20. I believe 'Irascible' will agree... Flow-Hoods...

    I believe 'Irascible' will agree...
    Flow-Hoods may be viewed as the easiest/best way to check airflow; however; all HVAC contractors need to have available to their 'Competent' TECHs 'every...
  21. Replies
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    There are usually always things you can do to...

    There are usually always things you can do to reduce heat-gain/heat-loss; so I'd go with the smallest equipment that can be made to work at peak conditions.

    Actually, in that climate a 1300-sf...
  22. Thread: Any Clue

    by udarrell
    Replies
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    534

    I should have, but I didn't notice the space;...

    I should have, but I didn't notice the space; works now...
  23. Thread: Any Clue

    by udarrell
    Replies
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    534

    Your link does not work for me. Describe your...

    Your link does not work for me.
    Describe your problem...
  24. IMO, on every replacement, or even on any service...

    IMO, on every replacement, or even on any service call, if there is any indication at all of an airflow problem the duct system ought to be 'properly checked' for problems that need correcting......
  25. I'd personally would switch to a high 95%...

    I'd personally would switch to a high 95% efficiency performance propane furnace.

    First evaluate the energy efficiency of your home; then do a load-calc using any reductions on heat-loss you are...
  26. Replies
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    Do you have a heat pump? What I posted would...

    Do you have a heat pump?

    What I posted would be out-of-line using a heat pump or any aux heat because of course you would need to say below its kick-on temp-drop differential setting.
  27. Replies
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    Winter design in San Diego is 46F. It shouldn't...

    Winter design in San Diego is 46F.
    It shouldn't take that much in that climate to heat a 1000-sf area.

    The home needs an energy audit & load-calc performed using the load numbers after...
  28. Replies
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    I had mine set at 68; now @ 69; at 68 it would...

    I had mine set at 68; now @ 69; at 68 it would drop to 66 then shut-off at 69F, a 3-degree temp swing. I believe the Swing is set at 5...that temp-swing is okay for me...

    You get more efficient...
  29. Replies
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    40K cu.ft. / by 8' ceilings is 5000-sf. 10K / 8'...

    40K cu.ft. / by 8' ceilings is 5000-sf. 10K / 8' is 1250-sf.
    We don't know the height of the ceilings.

    I take it each furnace serve about 50% of the conditioned areas.(?)
  30. Replies
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    It sounds like a bad duct system design & perhaps...

    It sounds like a bad duct system design & perhaps an over sized furnace.
    Things ought to be done right on a new home!
    They need to get things RIGHT for you...!
  31. For a 38,000-Btu/hr Output furnace & a 1.5-Ton...

    For a 38,000-Btu/hr Output furnace & a 1.5-Ton A/C or heat pump it would need (9) 6" 'flex' ducts at (@ .05" Friction Rate) to flow 75-CFM each, for 675-CFM.
  32. Replies
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    The area sizing & type of filter is extremely...

    The area sizing & type of filter is extremely important to indoor air quality & efficiency of performance; downsizing equipment will improve those efficiencies of performance. Air velocity through...
  33. That choice will make little to no difference;...

    That choice will make little to no difference; however, 'the quality of all aspects of the install' can make a huge difference.
  34. Replies
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    NO WAY! Only a 1299-sf home in a very moderate...

    NO WAY!

    Only a 1299-sf home in a very moderate climate.
    San Diego CA 99% Winter Design: +46F.
    Summer Design: 1% 81F dry bulb; 67F wet bulb.

    No proper load-calc could come up with a 3-ton...
  35. Replies
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    Dan SW FL knows how to provide the data & the...

    Dan SW FL knows how to provide the data & the formulas...it would be great if every TECH had those high level technical & communication skills. Well, we simply can't all be that talented...
  36. Well, it appears your home is NOT very energy...

    Well, it appears your home is NOT very energy efficient.

    There is only 9,500-output Btu/hr difference between the 50K > 47,500-output Btu/hr & the 40K > 38K output.

    Insulating & reducing air...
  37. A single stage furnace's response is not...

    A single stage furnace's response is not changed/affected by the room TH setting; it just delivers its rated heat output.

    The furnace would deliver the Output to the rooms that the quality of the...
  38. Why would U want to heat the house to 78F on the...

    Why would U want to heat the house to 78F on the coldest nights?
    70F would be a more reasonable comfort temp to size to at your winter design conditions.
    Would the Trane 40,000-input...
  39. Replies
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    NO!

    NO!
  40. What size heat pump & furnace do U have? We have...

    What size heat pump & furnace do U have?
    We have to know the required CFM of airflow to determine the filter grille areas required for a specific fpm velocity through the filters & pressure drop.
    ...
  41. You have to have a lot of filter area to get a...

    You have to have a lot of filter area to get a low 300-fpm velocity through a new clean filter and IMO .20" is too much Pressure Drop, if at that velocity.

    Most return filter areas will usually...
  42. Replies
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    The amount of airflow CFM through a register...

    The amount of airflow CFM through a register depends on a lot of engineering factors that must work together to deliver the correct amount of CFM to the room's register/diffuser at the proper fpm...
  43. Somebody messed-up; I wouldn't want to operate an...

    Somebody messed-up; I wouldn't want to operate an oil furnace without a filter at the tank outlet.

    Many have a small filter/screen at the oil pump inlet; which around here virtually never get...
  44. It would have to be a mere 1.5-Ton A/C to require...

    It would have to be a mere 1.5-Ton A/C to require a noticeable lower airflow than a 60,000-Btuh input furnace for heating.
    A 2-Ton A/C would require a little less airflow; not much less airflow,...
  45. They have ONLY a 7" duct feeding a distribution...

    They have ONLY a 7" duct feeding a distribution box that feeds (2) 6" ducts one to the master bed room & one to the dinning room. What is the sf area of each of those rooms? Plus 300-sf area?
    ...
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    I don't know what type of setup you have,...

    I don't know what type of setup you have, therefore it's not as easy to provide the easy options.

    For a 3-Ton system I'd want 2 filter areas as 'large a sq.in. area' -as 'the situation' permits;...
  47. Replies
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    Filters ought to be rated according to the free...

    Filters ought to be rated according to the free air area or (Ak) just as they do on return air grilles and supply air diffusers.

    Then you could easily figure what size filter you need for that...
  48. ACCA manual D states that you don't want any more...

    ACCA manual D states that you don't want any more than 300 ft./m of air velocity through a new clean fiberglass filter; so the best way would be to test the airflow velocity through the filter.
    ...
  49. What were the runtimes heating & cooling during...

    What were the runtimes heating & cooling during design temps?

    Cincinnati Ohio winter design is +12F; summer design 90F & 75F wet bulb.
    Around 50% relative humidity but @ 90F; 108 grains...
  50. Well, I'm not going search back posts for your...

    Well, I'm not going search back posts for your location; however, I'd certainly do some insulating & reduce air infiltration, etc.
    Your home is not that big that U would need a 120K furnace...
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