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  1. Thread: need help

    by dan sw fl
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    OVER current

    OVER current
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    https://www.ecomfort.com/manuals/flanders_pre_plea...

    https://www.ecomfort.com/manuals/flanders_pre_pleat_40_data_sheet.pdf
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    TESTING at > ~ 700 FPM filter Face Velocity will...

    TESTING at > ~ 700 FPM filter Face Velocity will Not be Accepted.
    I don't understand why testing set-up that significantly exceeds the filter Design Rating would be chosen.

    What are you using...
  4. The information provided in the copy of LOADCALC...

    The information provided in the copy of LOADCALC Is Inadequate.

    No building thermal properties were provided.
    I don't even know if the house was built in 2010, 1960 or _ _ _ _.

    Why is the...
  5. e-mail me the worksheet + Then I may discover a...

    e-mail me the worksheet + Then I may discover a discrepancy
    in modelling the 2 floors.

    gmail address: racingdan11
  6. Initial Thoughts

    MANUAL J needed to determine Heat Loss at 11'F

    I used 42,000 BTU/HR at 11'F in the attached Example.

    Thermal Balance Point Calculation
    _______ is also used to determine Operating Cost
    _______...
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    The majority of calcs are performed based on...

    The majority of calcs are performed based on drawings.
    Only 19 pieces of information are needed for a BLOCK LOAD
    ATTACHMENT
    _____ Shaded items on
    _ _ _ LINES 5, 8, 11, 12, 13, 15, 16, 18,...
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    INCREASE S.H.R. by decreasing Relative...

    INCREASE S.H.R.
    by decreasing Relative Humidity.

    THE BEST method to > S.H.R. would be to move to Arizona.
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    https://www.thermastor.com/how-to-purchase/ ...

    https://www.thermastor.com/how-to-purchase/

    TRY THIS FIRST,
    I would hate to set you back
    a Rather Large Fee
    ____ $,$$$.11

    Right to me, could be Insanely Ridiculous for you.
    Locale...
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    Recommendation is NOT " Local " IMO. OR Can...

    Recommendation is
    NOT " Local " IMO.

    OR
    Can you pay 3 HOUR round trip travel time?
  11. # 2 __ Am Std. 3-TON, 2 stage HEAT PUMP 17 SEER...

    # 2
    __ Am Std. 3-TON, 2 stage HEAT PUMP 17 SEER

    27,000 BTU/HR HEATING
    20,000 BTU/HR COOLING
    ______ presuming Very Well Built

    $ 0.11/ kw-hr
    $ 0.98/ Therm Natural Gas
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    I would say cooling the garage to 82'F (85'F)...

    I would say cooling the garage to 82'F (85'F) would be a SUCCESS
    when it's 93'F (96'F) outside.

    Cooling after 7 PM would Obviously be an appropriate cost savings procedure.
    However, whether...
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    There are RETURN GRILLES, DIFFUSERS ( Supply)...

    There are RETURN GRILLES, DIFFUSERS ( Supply)
    and Vents ( Supply).

    I don't understand the term ' Return Vents'.

    Generally, there are One to Four RETURN(s)
    & A DOZEN or more Vents /...
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    https://www.energystar.gov/sites/default/files/too...

    https://www.energystar.gov/sites/default/files/tools/ThermalEnc_factsheet_2017_10.18.17_508.pdf
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    5-Ton A/C system should be adequate for >> 4,000...

    5-Ton A/C system should be adequate for >> 4,000 Sq Feet 2018 Built residence

    4-Ton ____________" ___" ___ " _______ > 3,600 Sq Feet ________________
    ___________ with good Sealing, Windows /...
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    _ Duct load calculation is definitely NOT...

    _ Duct load calculation is definitely
    NOT REASONABLE for NEW Construction.

    _ MANUAL J = Bogus given the Duct + Equipment loads = ~50% of the Total.

    _ _ _ Two 2-Ton, 2-Stage Heat Pumps...
  17. I WAS FEELING FINE until about 4 minutes ago. ...

    I WAS FEELING FINE until about 4 minutes ago.

    NOW I AM QUITE ILL Just like when viewing other NATURAL DISASTERS.

    Is this Texas, after one of the recent tornados?
    ______

    ______ How does this...
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    What's the actual service / FUNCTION & SIZE of...

    What's the actual service / FUNCTION & SIZE of the area?

    Do you really need 10-tons or can the environment be > 76'F in the afternoon?

    It's PROBABLY time to get a little More CREATIVE
    & NOT...
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    It appears that the system is losing > 60% of its...

    It appears that the system is losing > 60% of its cooling capacity
    with a large temperature rise from the air handler outlet.

    ---

    A proper Manual J calculation takes into account the...
  20. IF THE FLEX DUCT is not stretched to > 85% of it...

    IF THE FLEX DUCT is not stretched to > 85% of it fully developed length without any sharp bends,
    the associated pressure drop is going to be quite detrimental to achieving proper air flow.
    ...
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    Adding a housing for 5" thick 500+ Sq inch MERV...

    Adding a housing for 5" thick 500+ Sq inch MERV 8 or 10 filter would definitely be an appropriate, non-creative/ Common solution.
    ...
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    HOW does the duct work heat the AIR 17'F WHEN it...

    HOW does the duct work heat the AIR 17'F WHEN it is in Conditioned Space.?

    ~ 3 Tons for 1969 Built residence Without renovations is probably close to adequate.
  23. MISTUBISHI SPEC / APPLICABILITY WONDER

    _ _ MULTI-HEAD OPTIONS
    _____ SIZES 06 + 09 + 09 …
    _ _ _ _ _ :whistle:

    JUST-A-FEW Combinations
    ___ :eek2: ___
    http://meus1.mylinkdrive.com/files/M-Series_MXZ_Operational_Performance.pdf
  24. INITIAL THOUGHTS

    EXAMPLE: 1992 Built, ZIP 48198, 2,100 Sq Feet - 2 STORY

    Glass: total surface area 300 Sq feet
    WALLS: R-11 W/ R-2
    CEILING: R-30
    FLOOR_: R-15

    Q. sensible 22,520 BTU/ HR
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    I prefer LONG CYCLES & SET T-STAT to 76'F - 77'F....

    I prefer LONG CYCLES & SET T-STAT to 76'F - 77'F.
    … … … … ____________ ______________
    ____________ 243 DAYS ON __ 122 Days Off.
  26. Significantly < 6,000 BTUH = 0, IMO. The load...

    Significantly < 6,000 BTUH = 0, IMO.
    The load period where < 6,000 BTUH might apply may be confined to
    when it is 71'F to 77'F outside ?? ???
    500 hours / year? 5.7% of the time.

    HOW MANY...
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    A/C Diffuser velocity is not really intended to...

    A/C Diffuser velocity is not really intended to be directly felt by occupants.
    It is for Adequate Mixing.

    USE PORTABLE, SHELF OR CEILING FANS FOR IMPROVED COOLING EFFECTS.

    --- MOST modern...
  28. === ===>> CELL PHONE

    === ===>> CELL PHONE <<=== ===
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    DECREASING THE DUCT SIZE will decrease the total...

    DECREASING THE DUCT SIZE will decrease the total air flow rate AND THROW.

    That is NOT THE DIRECTION one should be pursuing to increase air mixing....
  30. DEFINE COMFORTABLE & COOL

    ASHRAE 55 ___ 77'F AT 49% R.H.
  31. MIS-CALIBRATION could be in the Body/Mind OR the...

    MIS-CALIBRATION could be in the Body/Mind OR the Thermostat.

    70'F at 48% _ _ _ _or 72% R.H. are TWO ENTIRELY DIFFERENT ENVIRONMENTS:
    ___ DRY COOL - - - - - & WET COOL
    _ nICE __ & THEN...
  32. 1. 3100 SQ FT vs. 2400 700 SqFt difference...

    1.
    3100 SQ FT vs.
    2400

    700 SqFt difference

    2. 3.5-Ton Normal air flow rate would be 1,260 to 1,400 CFM not 2,008.2 CFM

    3. I Never specify 5-ton systems for a residence.
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    Where does one find a system < 2 tons?...

    Where does one find a system < 2 tons?
    -----------------------

    Running a system ~ 200 hours per year ( 30 days @ 7 hours / day)
    MIGHT BE GOOD FOR ANOTHER Three DECADES OR FOUR .

    15 year A/C...
  34. ALMOST all forms of life and equipment would...

    ALMOST all forms of life and equipment would struggle at 115'F.

    I wonder WHY this one HOT place is known as Death Valley?

    ZIP _ _ _ _ _
    or
    Saudi Arabia
  35. DFW 2 STORY - ? 2650 SQ FT 1st Floor; ...

    DFW
    2 STORY -
    ? 2650 SQ FT 1st Floor;
    1300 SQ FT 2nd Floor ?

    BUILT _ 19 _ _ / 1998 ?
    Ceiling R-30, Walls R-13

    U need to KNOW What size unit(s) u need.
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    I AM QUITE CERTAIN That the "LAWS OF PHYSICS "...

    I AM QUITE CERTAIN That the
    "LAWS OF PHYSICS " WILL NOT be in agreement
    with YOUR WISHES.

    Borrowed from rider77
    _______ _ _ _ _ "In this house we obey the laws of thermodynamics" - Homer...
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    DIG anywhere ...

    DIG anywhere

    https://www.ahridirectory.org/Search/SearchHome?ReturnUrl=%2f

    Definition of DIG includeS:
    _ _ _ _ _ _ _ _ _ _ to discover information through investigation.
  38. IT DEPENDS WHETHER YOU ARE ADDRESSING Houston,...

    IT DEPENDS WHETHER YOU ARE ADDRESSING
    Houston, Denver or Phoenix WEatHER.
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    REFRIGERATION SYSTEM NEEDED.

    REFRIGERATION SYSTEM NEEDED.
  40. UNDERrsizing: room temperature rises when...

    UNDERrsizing: room temperature rises when approaching environment design conditions

    OVERsizing: short cycling, inadequate humidity and comfort control

    Short cycling presents a distinct...
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    Equipment specs - Extended Performance Tables, ...

    Equipment specs - Extended Performance Tables,
    Tech Support at particular mfg
    or other ' dig ' process.

    https://www.nrel.gov/docs/fy12osti/52991.pdf
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    Presuming this scenario for 1,600 Sq Ft...

    Presuming this scenario for 1,600 Sq Ft residence:
    with Duke Energy Service

    1300 KW-HR / MONTH TOTAL
    . 800 KW-HR / MONTH COOLING __ Worst case / a.k.a highest usage
    . 500 ………………………. ...
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    4TWR7036 AHRI 7599442 A 3-ton, 2 stage would...

    4TWR7036 AHRI 7599442

    A 3-ton, 2 stage would be adequate.
    DB/WB indoor 77.0'F/ 63.4'F
    ODT 96.0'F

    Q. Total … . = 34,338 BTU/HR
    Q. Sensible = 28,554
    Q. Latent ... = 5,783
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    START OVER: _______ So you are trying to add A/C...

    START OVER:
    _______ So you are trying to add A/C in a 1,600 sq ft N Calif ranch built in 1956.

    1ST: Blower Door Tet required to determine Infiltration.
    _____ AND SEAL THE HOSUE AS REQUIRED.

    ...
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    __________ _ _ _ /\ _ _ /\ _ _ ___ B.S. ...

    __________ _ _ _ /\ _ _ /\ _ _ ___ B.S.

    not THE VALID reason that MORE AIR IS REQUIRED FOR COOLING.

    Q = cfm* dT * 1.08 <- Valid Reason
  46. A ROOM-BY-ROOM MANUAL J calc would normally be...

    A ROOM-BY-ROOM MANUAL J calc would normally be used to proceed to Manual D calc process.

    I would not perform a room-by-room calc ( A LOT OF HOURS to be accurate )
    without a good drawing &...
  47. HVAC System Design - R Haines

    Following the KISS Principle:

    ____1____ Q loss/gain = U * A * DT = A * DT / R =

    _____2___________________ Q. Air Capacity = CFM * DT * 1.08

    ______3___________ Q. Total = Q. L + Q .S =...
  48. FIRST, Request written copy of THE WARRANTY...

    FIRST, Request written copy of THE WARRANTY PAPERS.

    SECOND, FULL COMMISSIONING Report required that it typical of Commercial installations.
  49. Updated Manual J per your data

    NO.! You seems to be asking for the steps to be reversed.
    ________ Physics doesn't work that way.
    ROOM-BY-ROOM MANUAL J is Required to perform a Manual D / Duct design & Analysis

    MANUAL J =...
  50. 87,648 Operating HOURS / DECADE is Too Much. I...

    87,648 Operating HOURS / DECADE is Too Much.

    I would want one that CYCLES per the Thermostat procedure.
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