Search:

Type: Posts; User: udarrell

Page 1 of 20 1 2 3 4

Search: Search took 0.05 seconds.

  1. 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. (?)
  2. Replies
    3
    Views
    224

    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...
  3. 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.
  4. 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...
  5. 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...
  6. 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...
  7. Replies
    139
    Views
    5,150

    Amen to that...

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

    by udarrell
    Replies
    2
    Views
    228

    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......
  9. 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...
  10. 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...
  11. Replies
    12
    Views
    361

    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.
  12. Replies
    12
    Views
    361

    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...
  13. Replies
    12
    Views
    361

    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...
  14. Replies
    12
    Views
    361

    Well, it states it only delivers 647-CFM on high...

    Well, it states it only delivers 647-CFM on high speed, for a 2-Ton system that is only 323.5-CFM per/ton of cooling, which should increase the indoor temp-drop delta-T some; but if humidity is at...
  15. Replies
    12
    Views
    361

    I think it's probably with several air handlers...

    I think it's probably with several air handlers in various rooms.(?)

    Okay; the condenser air-temp-rise is 24F.
    Indoor humidity is around 45%.

    It is an 18-SEER Rated condenser; that is a very...
  16. Replies
    8
    Views
    441

    I agree with Mr Bill, IMO a rectangular main duct...

    I agree with Mr Bill, IMO a rectangular main duct system can normally be setup easier with incremental reduction transitions for a balanced delivery to each room.

    According to my software, to...
  17. Replies
    25
    Views
    2,032

    Hart&Cooley Engineering data says 24X24 is only...

    Hart&Cooley Engineering data says 24X24 is only good for 1032-CFM @400-fpm velocity; a 30X30 is good for 1602-CFM @400-fpm velocity.

    If it's a filter-grille the max clean filter velocity for a...
  18. IMO; Trane or any HVAC company ought to issue a...

    IMO; Trane or any HVAC company ought to issue a Recall on such a ridiculous lack of quality control conditions & do a free fix on every unit sold.

    I am sick & tried of all the evaporator...
  19. Replies
    25
    Views
    2,032

    Well, if the duct system is engineered properly...

    Well, if the duct system is engineered properly plus insulated enough & sealed tight, the difference between the low-stage 5-Ton & 4-Ton at least on the Goodman low stage should not make any...
  20. Thread: Undersized AC

    by udarrell
    Replies
    42
    Views
    1,860

    I wish everyone would follow your on-track...

    I wish everyone would follow your on-track approach.
    If the ducts in the attic are on boards on the floor, you might be able to cover them with a lot of insulation.

    I don't understand how it...
  21. Replies
    10
    Views
    757

    The customer should never have to do the...

    The customer should never have to do the troubleshooting!
  22. Replies
    3
    Views
    304

    The INDOOR relative humidity must be 50% or below...

    The INDOOR relative humidity must be 50% or below or U wouldn't have a 20 to 25F indoor temp-drop.
    Longer cycles help...
  23. Replies
    25
    Views
    2,032

    I'd say the above indicates problems... Do the...

    I'd say the above indicates problems...
    Do the simple tests I suggested in post #4.
  24. Replies
    3
    Views
    304

    At what temps & indoor humidity is it cycling...

    At what temps & indoor humidity is it cycling okay 4U at one CPH?
    What are the indoor SA & RA temps?
    Also, check the temp of the air coming off outdoor condenser to have an idea how the system is...
  25. Why are U using m/s -- meters per sec -- instead...

    Why are U using m/s -- meters per sec -- instead of fpm velocity?

    2.5 m/s is 490-fpm; 3 m/s is 590-fpm.
    An 0.9 m/s is not nearly enough airflow!

    How many duct runs do you have & what size...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event