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  1. Replies
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    I knew he was kidding...problem is there may be...

    I knew he was kidding...problem is there may be some that accept it as gospel.
    Mickey's method sounds real refreshing...
    :cheers:
  2. Thread: New HVAC help

    by udarrell
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    297

    Your temperatures average higher than I had...

    Your temperatures average higher than I had thought, therefore, the 4-Ton 2-stage looks like a good choice.

    I agree 100% with baldloonie's #9 post:


    Let us know how things work out & after...
  3. That depends primarily on the INDOOR % of...

    That depends primarily on the INDOOR % of relative Humidity.
    At 80F indoors & 73% relative humidity indoors the temp-drop should be around 16 or 17F.
    At 50% RH the drop should be around 19 to...
  4. You probably don't need a large 12,000-Btuh 'one...

    You probably don't need a large 12,000-Btuh 'one ton' window A/C.

    I use a 'Half-Ton window unit' for 650-sf area (that's 1200+-sf per/ton) to cool the entire 1st floor area, using a wind machine...
  5. Thread: New HVAC help

    by udarrell
    Replies
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    297

    That zip code indicates Roseville which is just...

    That zip code indicates Roseville which is just north of Sacramento, CA.
    Sacramento, 2.5% summer design is 98F dry bulb; 71F wet bulb or about only around 25% RH.

    Your cooling @78F & a very...
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    Well, the problem is U don't know how many Btuh...

    Well, the problem is U don't know how many Btuh the new system will deliver to & from the rooms.

    Gunslinger & Ikapigian +#3 are on target; providing the install fixed all the problems with the...
  7. Thread: New HVAC help

    by udarrell
    Replies
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    297

    Well, if it never can work on both zones...

    Well, if it never can work on both zones simultaneously you sure don't want a 5-Ton or even a 4-Ton on that system as the duct system setup will probably not begin to handle that large a Btuh/CFM...
  8. http://www.loadcalc.net/I Found a real good...

    http://www.loadcalc.net/I Found a real good temperature/humidity gage at Walmart today; ACU>RITE Humidity Monitor, Model: 00325/00326/00327 (Why 3-sets of #; No number on the gage); it appears to be...
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    Every Tech ought to carry a wet bulb stick; it...

    Every Tech ought to carry a wet bulb stick; it appears not many do much checking on performance, including airflow CFM.

    I used to use a sling psychrometer before the new fast hi-tech instruments...
  10. You can start doing an online free whole house...

    You can start doing an online free whole house load-calc, - now.
    http://www.loadcalc.net/
  11. Replies
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    I dislike oil heat for many reasons; one being...

    I dislike oil heat for many reasons; one being that the evap-coil is usually not installed far enough 'above' the furnace (about 6") which therefore usually results in very poor airflow.
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    A 4-Ton requires a large capacity duct system &...

    A 4-Ton requires a large capacity duct system & large return-air filter area; most are undersized; so if U can downsize the A/C, the duct sizing may be more inline with the CFM requirements of the...
  13. Thread: How can?

    by udarrell
    Replies
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    560

    If indoor wet bulb were say 76F & outdoor...

    If indoor wet bulb were say 76F & outdoor condenser entering temp 80F by some charts it would call for 35F superheat. Doubt it has that much SH, or enough. (?)
    Should 'always' at least have a SH...
  14. Replies
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    What was the outdoor temp & indoor temp plus...

    What was the outdoor temp & indoor temp plus indoor wet-bulb temp or %RH?
    If the outdoor temp was rather low & the superheat was too low, when it gets real hot outside there may be NO superheat...
  15. Thread: How can?

    by udarrell
    Replies
    16
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    560

    You have not answered my questions. As...

    You have not answered my questions.

    As beenthere said, that's a high $ SMAN manifold for not checking head pressure & subcooling.
    With a fixed piston orifice metering device; superheat could be...
  16. Replies
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    First; do an energy efficiency type audit of your...

    First; do an energy efficiency type audit of your home, hire a contractor that does them.
    This is so U know what U need to do to keep the equipment sizing as small as possible.

    Second; do a...
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    That is a 1" pleated filter, they load real fast...

    That is a 1" pleated filter, they load real fast on the surface area greatly increasing their pressure drop.



    There has to be a source for that contamination...
  18. Thread: How can?

    by udarrell
    Replies
    16
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    560

    What were the outdoor & indoor temps & the indoor...

    What were the outdoor & indoor temps & the indoor %RH?

    TXV or fixed orifice metering device?

    Why didn't U at least check the condenser discharge air-temp-split?
  19. That is the advantage of the longer runtime...

    That is the advantage of the longer runtime cycles; if it only ran for 10 minutes it would do very little dehumidification.



    That's good...programming is fun & helpful...:det:
  20. Replies
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    There may not have been 100-psig pressure...

    There may not have been 100-psig pressure difference between head & suction for the reversing valve to shift on its own.

    A compressor discharge hot gas restriction, like a muffler, can cause a...
  21. Replies
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    Are any of our PRO Techs near you? If the...

    Are any of our PRO Techs near you?

    If the compressor motor windings check out okay & it is not pulling too many amps when running at normal operating pressures; then I'd say put a start kit on it...
  22. I'm thinking the registers are getting too cold;...

    I'm thinking the registers are getting too cold; therefore moisture is condensing on them; not enough airflow to keep register temperatures above the dew-point.


    You need to use a good vapor...
  23. That is not the way I would want it to cycle; 20...

    That is not the way I would want it to cycle; 20 minutes of strait runtime is better than 15 minutes with a stop for 5-10 minutes then restarting to get to TH setpoint... not good lMO.

    IMO; you...
  24. If you want to lower your cooling utility bills...

    If you want to lower your cooling utility bills the first thing to do is have an Energy Efficiency Audit of your condo.

    They will tell you what the wall & ceiling R factors are, infiltration...
  25. Thread: New Trane XV

    by udarrell
    Replies
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    546

    One of the problems you could have with very low...

    One of the problems you could have with very low indoor airflow:
    With the lower indoor airflow you may need to make sure the Returns are near the ceiling(s) because you don't want the baseboard or...
  26. Replies
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    Many valid performance tests have shown that air...

    Many valid performance tests have shown that air conditioning systems 'on the average' only deliver to the conditioned areas between 59 to 63% of their Nominal Rated Performance. It pays huge...
  27. Replies
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    Well, 19F split is pretty good at say 50% indoor...

    Well, 19F split is pretty good at say 50% indoor RH.
    We need to know the indoor relative humidity.(?)

    Is the airflow low?

    What is the temp-split off the outdoor condenser?
    What SEER is the...
  28. Since it appears U are a renter, U should not be...

    Since it appears U are a renter, U should not be messing with any of this electrical stuff; an oversized fuse could cause a fire & you would be liable, call the owner.

    Nor can we advise the...
  29. It will, of course, be off longer with a wide...

    It will, of course, be off longer with a wide differential swing setting, therefore it will depend on how well your home keeps the humidity from entering the conditioned space.

    It can't work...
  30. Thread: New Trane XV

    by udarrell
    Replies
    17
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    546

    That is the kind of technology needed in many...

    That is the kind of technology needed in many parts of the country; lowering humidity levels often ought to the number-one priority.
    I would suppose that it would naturally run a great deal of the...
  31. Thread: New Trane XV

    by udarrell
    Replies
    17
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    546

    It's great to hear good reports occasionally. ...

    It's great to hear good reports occasionally.
    :pop:
    What are the cycle times runtimes & off times?

    I don't have the info on minimum compressor speed; if it seems to be working okay don't think...
  32. M You did not waste your time; you can't...

    M



    You did not waste your time; you can't drop back to a 2.5-ton not really enough even if you could use 50% of the latent excess of the unit, as in most of these 2-stage systems you'd have to...
  33. Well, I used a 3-Ton 16-SEER 2 stage Goodman...

    Well, I used a 3-Ton 16-SEER 2 stage Goodman setup because I have easy access to their expanded Data.

    On high-stage at 75F indoors & 50%-RH it delivers 32,100-Btuh @ 1150-CFM; on low-stage @...
  34. I agree with both of KB Cool's posts, #25 & #26;...

    I agree with both of KB Cool's posts, #25 & #26; it would be wise to have a Tech help you select a totally compatible heat pump thermostat that will do all the things U want including the...
  35. Wow! I wasn't 'thinking' or paying attention...

    Wow! I wasn't 'thinking' or paying attention don't recall what distracted me; I shouldn't have provided the model numbers because you have to have a TH for heat pumps. SORRY...I feel real bad about...
  36. Replies
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    Pull the disconnect; you don't want any 240 volt...

    Pull the disconnect; you don't want any 240 volt power at the unit!
    Safety first, always...if you're grounded real good even 24 volt can rock you too much.
  37. Replies
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    You should be able to read the model number (list...

    You should be able to read the model number (list all of the information) on the compressor that's inside the condenser.
    We should then be able to tell the tonnage of the condenser.
  38. Replies
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    Charleston, SC: at 2.5% summer design is 91F dry...

    Charleston, SC: at 2.5% summer design is 91F dry bulb (may be 92F db where U are) & 80F wet bulb or near 60% RH; humidity could be a major problem.
    I'd select everything toward controlling the...
  39. Thread: Is it true?

    by udarrell
    Replies
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    675

    Laughter is the best medicine & I got a heavy...

    Laughter is the best medicine & I got a heavy dose of it from your post. Thanks...
  40. As the Rock says; a lot of things are far more...

    As the Rock says; a lot of things are far more important than SEER Points.

    You would have to have identical conditions to those conditions they used to establish the SEER levels; & you don't.
    ...
  41. Replies
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    Then it probably is a 3.5-Ton unit; that would be...

    Then it probably is a 3.5-Ton unit; that would be an average of 140-CFM on each duct run.
    It depends on your home's energy efficiency but with some work U should be able to get the tonnage way down;...
  42. Replies
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    With 10 supply air diffusers, say, averaging...

    With 10 supply air diffusers, say, averaging 80-CFM each = 800-CFM - so could be a 2-Ton Condenser? (Who knows; average of 100-CFM each, would be a 2.5-Ton; they might even have put a 3-Ton on your...
  43. Thread: Is it true?

    by udarrell
    Replies
    24
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    675

    In respect to the high humidity problem... How...

    In respect to the high humidity problem...
    How long are the runtime-cycles in minutes?
    Keep track of them & the indoor & outdoor temperatures along with the humidity level indoors.

    If the...
  44. Replies
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    If you're in a humidity problem climate U don't...

    If you're in a humidity problem climate U don't usually want the larger indoor coil.
    However, the 2.5-Ton will have longer runtimes which will help control humidity.

    Here on the farm we have a...
  45. Replies
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    If the compressor has a crankcase heater using a...

    If the compressor has a crankcase heater using a capacitor it might have been feed current off the other side of the single pole contactor.
    Look at the wiring diagram or schematics...
  46. Replies
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    However, using a fiberglass filter !" deep 20X25...

    However, using a fiberglass filter !" deep 20X25 is actually about the right size for a 1.5-Ton A/C.
    Most RA filter's are undersized especially on the larger tonnages.
    You'll never have too much...
  47. Replies
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    Well, the 2.5-Ton condenser is probably a better...

    Well, the 2.5-Ton condenser is probably a better sizing than a 3-ton would be.
    Do a Free whole house load-calc & see what you get; get others to help you; print the instructions:...
  48. Replies
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    That was the (ESP) External Static Pressure...

    That was the (ESP) External Static Pressure rating of the air handler; all the way to 0.9"



    I would never use that high a CFM as very few systems would flow that amount of air without excess...
  49. Replies
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    I'm not sure what U did, could you show what U...

    I'm not sure what U did, could you show what U did? The equation I use, uses CFM, NOT fpm velocity.

    Have U checked to see what static pressure your air handler is rated at; .5", .6" or .7" ESP?...
  50. Replies
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    Well, everything is a 'catch-22 situation' I'm in...

    Well, everything is a 'catch-22 situation' I'm in rough shape & suffering is really rough; but I want to help HVAC users & Techs all I can while I can. When I stop posting you'll know I'm no longer...
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