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  1. Replies
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    penderway; Great Insight! I am wondering...

    penderway; Great Insight!



    I am wondering if the evaporator orifice is properly matched to the new condenser.
    It would be very important to know what CFM is being delivered per ton of...
  2. What size is the filter area under the furnace? ...

    What size is the filter area under the furnace?

    Looking at the pdf; they rated the fiter at 300-fpm velocity; at 50% open-air-area (Ak) it would only flow 300-CFM @300-fpm velocity.

    What size...
  3. We need a lot more information: What is the...

    We need a lot more information:
    What is the tonnage of the condenser, or model number?

    What type of filter are U using?
    one inch pleated filters are too restrictive.



    If U had two 1"...
  4. Replies
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    That is an awful fast SH drop! Could the...

    That is an awful fast SH drop!
    Could the diffusers somehow be adversely affecting the return air temp?

    Well, at 85F outdoors and a 66F indoor wet bulb, SH is 15F; as the indoor wet bulb...
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    Oversizing could make the upper level situation...

    Oversizing could make the upper level situation worse due to shorter runtimes.
    Pay attention to George2 & 2old2rock...duct remediation required.

    Having a Manual D performed on the system might...
  6. Not in my opinion. What makes U think they're...

    Not in my opinion.
    What makes U think they're superior? :whistle:
  7. Replies
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    Well; what happens is it's shorter to type & most...

    Well; what happens is it's shorter to type & most think its refrigerant rather than a Brand Name.
    I've even done it on rare occasions to save typing refrigerant...:whistle:

    Best to use short but...
  8. Replies
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    If you want to ballpark the sensible & then the...

    If you want to ballpark the sensible & then the total Btuh; say indoor temp-drop is 20F at 50%RH.

    Say the 2.5-Ton is delivering a Goodman low speed listed 945-CFM; 20F * 1.12 is 22.4 * 945-CFM...
  9. Replies
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    A lot of fantastic posts on this thread....

    A lot of fantastic posts on this thread.
    Darctangent great posts; I couldn't have covered that much -- even with voice software as it makes too many mistakes I have to correct.

    There are not...
  10. Replies
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    Easy way to ballpark airflow is to use furnace...

    Easy way to ballpark airflow is to use furnace heating mode; say the temp-rise is 60F * 1.08 is 64.8; "IF" furnace Output Btuh is 57,000-Btuh / 64.8 is 880-CFM.

    Then check the owner's manual...
  11. Replies
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    I found Manahawkin, therefore using Atlantic...

    I found Manahawkin, therefore using Atlantic City, NJ which is south of you the 2.5% summer design would be 89F dry bulb, 74F wet bulb for about 50% RH. That's considered a high %RH.

    It appears...
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    Sandy hit a lot of states along the coast. ...

    Sandy hit a lot of states along the coast.
    Where are you located, or did I miss that?
    Shouldn't be that hot there; is it real humid?

    You may have to do your own testing of performance....
  13. Replies
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    Maybe he was thinking high-stage when he made the...

    Maybe he was thinking high-stage when he made the miscue of saying stage 1 instead of saying stage 2. (?)
  14. Replies
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    The noise could be due to not having large enough...

    The noise could be due to not having large enough ducts & registers or grille-vents which results in too much air velocity.
    Larger ducts, grille-vents & filter areas allow for more CFM volume at a...
  15. If the 30 amp breaker was not tripping there...

    If the 30 amp breaker was not tripping there would be no valid reason to go to a 40 amp breaker.
  16. amps times* actual voltage= watts So, when...

    amps times* actual voltage= watts
    So, when voltage drops amps go up to equal a fairly similar wattage.
    There are some efficiency losses due to undersized conductors...
    Depends on how much they...
  17. You should buy a low cost humidity gage at a...

    You should buy a low cost humidity gage at a hardware store for use indoors, as the indoor %RH affects the amount of indoor temp-drop U get at the indoor Evaporator coil.

    At around 50% RH the...
  18. Okay, a 3.5-Ton system needs 1400-CFM; 1400-CFM /...

    Okay, a 3.5-Ton system needs 1400-CFM; 1400-CFM / 19-diffusers is an average of +73.7-CFM per diffuser.

    A 2x12 floor diffuse only delivers 50-CFM @500-fpm velocity; a 4x10 floor diffuser delivers...
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    Amen to that...

    Amen to that...
  20. Thread: Cycle times

    by udarrell
    Replies
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    258

    Well; using 90F & 72F indoors I'd do a...

    Well; using 90F & 72F indoors I'd do a load-calc to see if the cycling is normal compared to what the load-calc says.
    free online whole house load-calc

    Print the instructions & follow them......
  21. You should perform a load-calc so you size a new...

    You should perform a load-calc so you size a new unit properly.
    The unit U have may not heat & cool the rooms adequately.(?)

    Free whole house online load-calc

    Print & follow all the...
  22. If it is an older air handler with a new...

    If it is an older air handler with a new replacement install, U actually can't depend on static pressure readings.

    Check the blower wheel for lint build-up & the duct system for supply air leaks...
  23. Replies
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    Are you talking about the larger suction line? It...

    Are you talking about the larger suction line? It should be insulated...
    The small liquid line should not be cold & sweating unless there is a restriction in the line.
  24. Replies
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    Unless the small liquid line goes through, for a...

    Unless the small liquid line goes through, for a fair distance, a very hot attic or lays on a hot tar roof (then insulate it) it does not usually need to be insulated; normally only the TXV sensing...
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    What is important is the 'indoor' wet bulb &...

    What is important is the 'indoor' wet bulb & %relative humidity that puts a heavy latent load on the condenser to handle; still can't see how it could raise condenser discharge air-temp delta-T to...
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