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  1. Replies
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    General Operatoin

    If one keeps an A/C unit operating well
    with a good maintenance program,
    one may expect to see a life of upto 50,000 hours.

    One certainly will not see anywhere near 1/2 of that life
    when the...
  2. Replies
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    Page 4 or 5 See LINK ...

    Page 4 or 5
    See
    LINK

    http://www.americanstandardair.com/content/dam/Trane/Commercial/global/products-systems/equipment/unitary/split-systems/split-systems-1-1-2-to-5-tons/22-1890-01.pdf
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    ... You can only WISH electric rate was 2 cents....

    ... You can only WISH electric rate was 2 cents.

    http://www.electricrate.com/residential-rates-massachusetts/
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    How old is the house? It must be SUPER...

    How old is the house?

    It must be SUPER INSULATED and Very Tight to be running only 30% of the time
    when it is 105'F and maintaining < 77'F.!
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    C.O.P. for a general SEER / HSPF level can be...

    C.O.P. for a general SEER / HSPF level can be used to establish
    performance and cost estimates with Reasonable accuracy.

    What is your particular situation and objective?

    At > 30'F,
    N.G. at...
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    $8.80 / 73 kW-hr for 1,000,000 BTU at $0.12 /...

    $8.80 / 73 kW-hr for 1,000,000 BTU at $0.12 / Kw-Hr for > 40'F
    about 13% - 18% more in the 30'F to 35'F range

    ... 4.0 - ___ Heat Pump C.O.P. for Toutside > 40'F
    100,000 ___ BTU/ Therm ...
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    Variable speed 4-ton downstairs would ramp down...

    Variable speed 4-ton downstairs would ramp down to less than 2-tons
    + control humidity. Then you can turn the t-stat up to 76 or 77'F
    with the same perceived comfort level.

    I didn't say it...
  8. - - Q = A * dT / R Loss with the duct using...

    - - Q = A * dT / R

    Loss with the duct using R 4 and 130'F for the rafter space temperature ..
    Loss is about 18% of system sensible cooling capacity for a total of 5 duct that are 18 feet each....
  9. > MERV 6 is one of the success paths to KILLING A...

    > MERV 6 is one of the success paths to KILLING A SYSTEM
  10. Check superheat & subcooling, refrigerant level

    The unit is running at about 6% capacity. Q sensible / Q total Nominal capacity

    Q sensible = 1.08 * CFM* dT

    500 CFM (5 * ~100 CFM per vent / could be lower ?!)
    1.08 Constant
    73'F Tin (Room...
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    "Typical" annual electric usage would be < 15,000...

    "Typical" annual electric usage would be < 15,000 kw-hr.
    Your 42,000 kw-hr is obviously quite extreme.

    I do not understand how anyone performing an energy audit has not provided
    more guidance...
  12. MILLINGTON MUNI ARP 35.35 NORTH 89.87 WEST /...

    MILLINGTON MUNI ARP
    35.35 NORTH 89.87 WEST / 322 Elevation

    ASHRAE
    99.6% 99.0%
    14.0'F 19.6'F

    0.4%
    DRY BULB
    ........... WET BULB
  13. What is the Supply Air temperature of the 1.5...

    What is the Supply Air temperature of the 1.5 Ton?

    Is the Bonus Room Relative Humidity greater than 53%?
    [ must be measured with an appropriate, accurate hygrometer ]

    If there is a...
  14. Post # 8 with photos look like a Prescription...

    Post # 8 with photos look like a

    Prescription for Disaster

    given the Confined Space with HIGH WALL

    + being in Phoenix.
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    I would presume that the Heat Loss at 0'F would...

    I would presume that the Heat Loss at 0'F would be < 40,000 BTU/HR
    ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,....... so at 35'F would be < 20,000 BTU/HR -
    ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, more...
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    Heat Pump will SIGNIFICANTLY reduce Operating Cost$

    ELECTRIC STRIPS

    Heat Loss = ~ 40,000 BTU/HR at 0'F
    given my assumptions for 1985 construction

    As you supporting the local electric utility to the tune of > $3,400 / year
    to heat your 1,000...
  17. VAULTED Ceilings are Always an issue with...

    VAULTED Ceilings are Always an issue with increased heat gains.

    You may wish to select 16 SEER equipment.
    for example, multi-stage
    Probably a 3-ton system, given Columbia SC has many days near...
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    GENERAL OBJECTIVES: ACCA Standard 5...

    GENERAL OBJECTIVES: ACCA Standard 5
    http://www.energystar.gov/ia/home_improvement/home_contractors/qispec.pdf

    http://www.heatpumpguide.com/ratings-reviews/bryant-heat-pump-reviews-and-ratings/
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    50,000 BTU/Hr is way TOO Much for MANY...

    50,000 BTU/Hr is way TOO Much for MANY residences.

    LOCALE?

    SIZE & AGE of Home?

    # of windows __
  20. One should INVESTigate variable and multi-speed...

    One should INVESTigate variable and multi-speed equipment OPTIONS in the 18 SEER Range given the electric rates in California.
  21. How old is the current 5-Ton per the technician?...

    How old is the current 5-Ton per the technician?
    " __ " _ " _ " __ "__ OVERSIZED Furnace?

    More than likely older than desired
    and perhaps
    _ way beyond it's useful life _

    A fix of a leak...
  22. Replies
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    Manual J type calc and Annual Electrical Costs for Heating & Cooling

    4-ton is required based on My assumptions of insulation values and window properties.
    18 SEER 10 HSPF

    See my attached calc for a 1,850 square foot, single story, 1970-built residence.
    20'F =...
  23. Replies
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    ... floor to ceiling by 120" wide window" for...

    ... floor to ceiling by 120" wide window" for EACH bedroom certainly seems to be a typo on 120"
    ( 10 feet by 8 feet - is simply Not Reasonable).

    ... 4 , 5, 6 OR x Bedrooms ?

    What city? ...
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    1) A/C should run CONSTANT from about noon to at...

    1) A/C should run CONSTANT from about noon to at least 7 PM
    .............................._ :eek2: _................------- _ ---------
    ________ when it's More Than 90'F outside.

    It appears...
  25. -- Sounds like you may live in a rather moderate...

    --
    Sounds like you may live in a rather moderate climate for both heating and cooling.
    Why are you entertaining use of geothermal?
    Is your HVAC replacement budget more than $30,000?

    Is that...
  26. Replies
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    During maximum heat gain periods, a 5-ton air...

    During maximum heat gain periods, a 5-ton air handler should be providing about 1,800 CFM.
    [ assuming the residence actually needs a 5 ton unit ...i.e. Perhaps > 3,000 square foot home ]
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    I could not tell what the Actual outcome would be...

    I could not tell what the Actual outcome would be
    for certain
    without the BIG PICTURE provided by performing
    ACCA Manual J and D calculations.

    IF anyone tells you otherwise, they had better...
  28. Thread: Trane XL14i

    by dan sw fl
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    238

    Start a cat shelter

    Start a cat shelter
  29. So, it's 105'F outside and you can ONLY cool to...

    So, it's 105'F outside and you can ONLY cool to 76'F.
    _ _ Sounds like __ THAT'S PERFECT __ .!..!

    And at night, when it's 89'F Out, you are able achieve 60'F.
    _______________ {stuck on...
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    http://www.lennox.com/products/air-conditioners/XC...

    http://www.lennox.com/products/air-conditioners/XC16/

    - - 2 TON - -
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    What are the EXACT Run Times (On AND OFF...

    What are the EXACT Run Times (On AND OFF durations) versus outside conditions?

    Locale?

    Condenser Unit and air handler sizes?

    House size and age?
  32. So it.s ON for 11 minutes and OFF for 3 minutes...

    So it.s ON for 11 minutes and OFF for 3 minutes even in Mid- to Late Afternoon when it's 92'F outside?
  33. Sounds fairly normal for an "mid-life or older"...

    Sounds fairly normal for an "mid-life or older" system.

    It does Not sound like you have taken advantage of an ANNUAL MAINTENANCE CONTRACT.

    We don't know if the system or components in general...
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    GOOD SELECTION.

    GOOD SELECTION.
  35. Determine Life Cycle Cost

    " Sweet spot " = What?

    Depends on:
    ... equipment life,
    ... operating cost (thermal building envelope & electricity $ rate),
    ... installed cost
    ... & maintenance costs.

    OPERATING CO$T =...
  36. http://www.allseasonsheatingsd.com/wp-content/uplo...

    http://www.allseasonsheatingsd.com/wp-content/uploads/2012/06/59tp5a-03pd.pdf

    DEPENDS ON
    AIR FLOW REQUIREMENTS

    3 TONS = ~1,100 CFM
    Maximum cooling is probably only necessary < 4 hours / day...
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    Calc can NOT be accurate for a 1914 Residence...

    Calc can NOT be accurate for a 1914 Residence without a specific, applicable Infiltration rate.
    Infiltration rate could be in the 0.6 to 1.6 Air Change per Hour (A.C.H.) range.

    I would not wish...
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    4-ton 2 STAGE seems most appropriate. ...

    4-ton 2 STAGE seems most appropriate.

    However,
    It appears that you selected about -20'F for your design temperature.
    ... 94,389 BTU/HR Heat Loss would probably only apply to a > 80 year old,...
  39. A/C efficiency decrease would be in the ball park...

    A/C efficiency decrease would be in the ball park of 15% in comparing performance at 95'F versus 75'F
  40. NOT IF the residence is >> 70 years old.

    NOT IF the residence is >> 70 years old.
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    The TRANE unit ought to last ~ 9 years in this...

    The TRANE unit ought to last ~ 9 years in this absurdly corrosive environment,
    whereas, the Ameristar may only last ~ 6 years.

    Therefore, the TRANE unit may be about 30% less costly over the...
  42. One might expect to save in the range of $ 30 per...

    One might expect to save in the range of $ 30 per year
    based on $0.13/ kw-hr for a 1.5 ton A/C
    and ….. ……. ….. .. 1,000 Full Operating Hours
    SEER _ _ _ KW/TON _ _ _ $$$/ YEAR
    10 _ _...
  43. 1,150 Sq foot, single floor Age of condo < 35...

    1,150 Sq foot, single floor
    Age of condo < 35 years old

    A 2-ton unit should be
    _MORE THAN ADEQUATE_ for 90'F design temperature
    and less than 900 Cooling Degree Days (CDD).
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    With a programmable thermo-stat, I would set to...

    With a programmable thermo-stat,
    I would set to 82'F for 8 am to 5 am with
    ... .. it set to 78'F from 5 am to 8 am.
    Operating cost would generally be ~ $1 /day for a 3-ton unit.

    I believe...
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    http://www.acca.org/standards/acca-speed-sheets/

    http://www.acca.org/standards/acca-speed-sheets/
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    http://www.icpeqp.com/AHRIratings/ratings.aspx?Bra...

    http://www.icpeqp.com/AHRIratings/ratings.aspx?Brand=Keeprite

    You can find your AHRI rating here. .. link above

    28,000 versus about 34,000 BTU/HR
    2.5 Ton ................. 3-ton
    I'd say based...
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    18 SEER 3-ton unit would save $200 over a 14 SEER...

    18 SEER 3-ton unit would save $200 over a 14 SEER

    Used $0.12/ kw-hr

    Heating is ~ $300 per year at $1.00 /therm
    R -5.0 for walls

    Q heating is 24,060 BTU/HR at 35'F dT

    Q cooling sensible...
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    1 Yes 4,800 Sq. Feet - One Story Window...

    1 Yes


    4,800 Sq. Feet - One Story

    Window U-value 0.28 _ 620 Sq Feet
    Ceiling R-45
    Wall ...R-18

    51,000 BTU/HR at 10'F
  49. Replies
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    1 There is ALWAYS A WAY.! It just the effort...

    1 There is ALWAYS A WAY.!
    It just the effort ( & $$$ ) that is needed that makes it difficult to install & control

    SunRoom with 200 square feet of glass could require nearly 1.5 tons in the...
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    With such a complex duct system, it would have to...

    With such a complex duct system, it would have to be METAL DUCT to
    provide anywhere close to the design flow rate.

    If the filter size is less than 600 square inches,
    it should be changed to...
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